Init

.drone.yml

@@ -0,0 +1,37 @@
+kind: pipeline
+type: docker
+name: build
+
+steps:
+  - name: build
+    image: plugins/docker
+    settings:
+      registry: cr.selcloud.ru
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      repo: cr.selcloud.ru/russia9/${DRONE_REPO_NAME}/${DRONE_COMMIT_BRANCH}
+      tags:
+        - latest
+        - ${DRONE_COMMIT_SHA}
+      cache_from:
+        - cr.selcloud.ru/russia9/${DRONE_REPO_NAME}/${DRONE_COMMIT_BRANCH}:latest
+
+  - name: deploy
+    image: appleboy/drone-ssh
+    settings:
+      host:
+        from_secret: ssh_address
+      username:
+        from_secret: ssh_username
+      key:
+        from_secret: ssh_key
+      port: 22
+      script_stop: true
+      script:
+        - docker-compose -f /srv/chatwars-spy/docker-compose.yml pull
+        - docker-compose -f /srv/chatwars-spy/docker-compose.yml up -d
+    when:
+      branch:
+        - master

.gitignore

@@ -0,0 +1,63 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Go template
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+### Vim template
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+*~
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea
+
+# CMake
+cmake-build-*/
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties

Dockerfile

@@ -0,0 +1,13 @@
+FROM golang:1.18
+
+# Set app workdir
+WORKDIR /go/src/app
+
+# Copy application sources
+COPY . .
+
+# Build app
+RUN go build -o app gitea.russia9.dev/Russia9/chatwars-spy/cmd/main
+
+# Run app
+CMD ["./app"]

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+want it, that you can change the software or use pieces of it in new
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+
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+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
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+authors' sake, the GPL requires that modified versions be marked as
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+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,2 @@
+# ChatWars Spy
+Ищет пользователей ChatWars из информации о дуэлях, предложениях и сделках на бирже.

cmd/main/main.go

@@ -0,0 +1,170 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"gitea.russia9.dev/Russia9/chatwars-spy/internal/utils"
+	"gitea.russia9.dev/Russia9/chatwars-spy/pkg/domain"
+	"gitea.russia9.dev/Russia9/chatwars-spy/pkg/message"
+	"gitea.russia9.dev/Russia9/chatwars-spy/pkg/storage/mongodb"
+	"github.com/confluentinc/confluent-kafka-go/kafka"
+	"github.com/google/uuid"
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+	"os"
+	"strconv"
+)
+
+func main() {
+	// Log settings
+	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
+	pretty, err := strconv.ParseBool(os.Getenv("LOG_PRETTY"))
+	if err != nil {
+		pretty = false
+	}
+	if pretty {
+		log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+	}
+	switch os.Getenv("LOG_LEVEL") {
+	case "DISABLED":
+		zerolog.SetGlobalLevel(zerolog.Disabled)
+	case "PANIC":
+		zerolog.SetGlobalLevel(zerolog.PanicLevel)
+	case "FATAL":
+		zerolog.SetGlobalLevel(zerolog.FatalLevel)
+	case "ERROR":
+		zerolog.SetGlobalLevel(zerolog.ErrorLevel)
+	case "WARN":
+		zerolog.SetGlobalLevel(zerolog.WarnLevel)
+	case "DEBUG":
+		zerolog.SetGlobalLevel(zerolog.DebugLevel)
+	case "TRACE":
+		zerolog.SetGlobalLevel(zerolog.TraceLevel)
+	default:
+		zerolog.SetGlobalLevel(zerolog.InfoLevel)
+	}
+
+	version := utils.GetEnv("CHATWARS_VERSION", "cw3")
+
+	// Kafka consumer init
+	consumer, err := kafka.NewConsumer(&kafka.ConfigMap{
+		"bootstrap.servers": utils.GetEnv("KAFKA_ADDRESS", "digest-api.chtwrs.com:9092"),
+		"group.id":          version + "-" + uuid.New().String(),
+		"auto.offset.reset": "latest",
+	})
+	if err != nil {
+		log.Fatal().Err(err).Send()
+	}
+
+	// DB init
+	client, err := mongo.Connect(context.Background(), options.Client().ApplyURI(os.Getenv("MONGO_URI")))
+	if err != nil {
+		log.Fatal().Err(err).Send()
+	}
+	defer client.Disconnect(context.Background())
+	err = client.Ping(context.Background(), nil)
+	if err != nil {
+		log.Fatal().Err(err).Send()
+	}
+	db := client.Database(utils.GetEnv("MONGO_DB", "chatwars"))
+	repo := mongodb.NewUserRepo(db)
+
+	// Kafka subscribe
+	err = consumer.SubscribeTopics([]string{version + "-offers", version + "-deals", version + "-duels"}, nil)
+	if err != nil {
+		log.Fatal().Err(err).Send()
+	}
+
+	log.Info().Msg("Started watching")
+
+	// Get messages
+	for {
+		// Read message
+		raw, err := consumer.ReadMessage(-1)
+		if err != nil {
+			log.Error().Str("source", "consumer").Err(err).Send()
+			continue
+		}
+
+		log.Trace().Bytes("message", raw.Value).Msg("received message")
+
+		switch *raw.TopicPartition.Topic {
+		case version + "-offers": // Offers
+			// Decode message
+			var msg message.Offer
+			err = json.Unmarshal(raw.Value, &msg)
+			if err != nil {
+				log.Warn().Err(err).Str("topic", *raw.TopicPartition.Topic).Send()
+				continue
+			}
+
+			// Store user
+			_ = repo.Store(context.Background(),
+				&domain.User{
+					ID:     msg.SellerID,
+					Castle: msg.SellerCastle,
+					Name:   msg.SellerName,
+					Source: "offers",
+				},
+			)
+		case version + "-duels": // Duels
+			// Decode message
+			var msg message.Duel
+			err = json.Unmarshal(raw.Value, &msg)
+			if err != nil {
+				log.Warn().Err(err).Str("topic", *raw.TopicPartition.Topic).Send()
+				continue
+			}
+
+			// Store users
+			_ = repo.Store(context.Background(),
+				&domain.User{
+					ID:     msg.Winner.ID,
+					Castle: msg.Winner.Castle,
+					Guild:  msg.Winner.Tag,
+					Name:   msg.Winner.Name,
+					Level:  msg.Winner.Level,
+					Source: "duels",
+				},
+			)
+			_ = repo.Store(context.Background(),
+				&domain.User{
+					ID:     msg.Loser.ID,
+					Castle: msg.Loser.Castle,
+					Guild:  msg.Loser.Tag,
+					Name:   msg.Loser.Name,
+					Level:  msg.Loser.Level,
+					Source: "duels",
+				},
+			)
+		case version + "-deals": // Deals
+			// Decode message
+			var msg message.Deal
+			err = json.Unmarshal(raw.Value, &msg)
+			if err != nil {
+				log.Warn().Err(err).Str("topic", *raw.TopicPartition.Topic).Send()
+				continue
+			}
+
+			// Store users
+			_ = repo.Store(context.Background(),
+				&domain.User{
+					ID:     msg.SellerID,
+					Castle: msg.SellerCastle,
+					Name:   msg.SellerName,
+					Source: "deals",
+				},
+			)
+			_ = repo.Store(context.Background(),
+				&domain.User{
+					ID:     msg.BuyerID,
+					Castle: msg.BuyerCastle,
+					Name:   msg.BuyerName,
+					Source: "deals",
+				},
+			)
+		}
+	}
+}

go.mod

@@ -0,0 +1,26 @@
+module gitea.russia9.dev/Russia9/chatwars-spy
+
+go 1.18
+
+require (
+	github.com/confluentinc/confluent-kafka-go v1.8.2
+	github.com/google/uuid v1.3.0
+	github.com/rs/zerolog v1.26.1
+	go.mongodb.org/mongo-driver v1.9.0
+)
+
+require (
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/klauspost/compress v1.15.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/stretchr/testify v1.7.0 // indirect
+	github.com/xdg-go/pbkdf2 v1.0.0 // indirect
+	github.com/xdg-go/scram v1.1.1 // indirect
+	github.com/xdg-go/stringprep v1.0.3 // indirect
+	github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a // indirect
+	golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/text v0.3.7 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)

go.sum

@@ -0,0 +1,96 @@
+github.com/confluentinc/confluent-kafka-go v1.8.2 h1:PBdbvYpyOdFLehj8j+9ba7FL4c4Moxn79gy9cYKxG5E=
+github.com/confluentinc/confluent-kafka-go v1.8.2/go.mod h1:u2zNLny2xq+5rWeTQjFHbDzzNuba4P1vo31r9r4uAdg=
+github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/go-stack/stack v1.8.1 h1:ntEHSVwIt7PNXNpgPmVfMrNhLtgjlmnZha2kOpuRiDw=
+github.com/go-stack/stack v1.8.1/go.mod h1:dcoOX6HbPZSZptuspn9bctJ+N/CnF5gGygcUP3XYfe4=
+github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
+github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.5.2 h1:X2ev0eStA3AbceY54o37/0PQ/UWqKEiiO2dKL5OPaFM=
+github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/klauspost/compress v1.13.6/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
+github.com/klauspost/compress v1.15.1 h1:y9FcTHGyrebwfP0ZZqFiaxTaiDnUrGkJkI+f583BL1A=
+github.com/klauspost/compress v1.15.1/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/montanaflynn/stats v0.0.0-20171201202039-1bf9dbcd8cbe/go.mod h1:wL8QJuTMNUDYhXwkmfOly8iTdp5TEcJFWZD2D7SIkUc=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rs/xid v1.3.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
+github.com/rs/zerolog v1.26.1 h1:/ihwxqH+4z8UxyI70wM1z9yCvkWcfz/a3mj48k/Zngc=
+github.com/rs/zerolog v1.26.1/go.mod h1:/wSSJWX7lVrsOwlbyTRSOJvqRlc+WjWlfes+CiJ+tmc=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
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+github.com/xdg-go/pbkdf2 v1.0.0 h1:Su7DPu48wXMwC3bs7MCNG+z4FhcyEuz5dlvchbq0B0c=
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+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/utils/common.go

@@ -0,0 +1,10 @@
+package utils
+
+import "os"
+
+func GetEnv(key, fallback string) string {
+	if value, ok := os.LookupEnv(key); ok {
+		return value
+	}
+	return fallback
+}

pkg/domain/user.go

@@ -0,0 +1,22 @@
+package domain
+
+import (
+	"context"
+	"time"
+)
+
+type User struct {
+	ID     string `bson:"_id"`
+	Castle string
+	Guild  string
+	Name   string
+	Level  int
+	Source string
+
+	FirstSeen time.Time
+	LastSeen  time.Time
+}
+
+type UserRepo interface {
+	Store(ctx context.Context, object *User) error
+}

pkg/message/deal.go

@@ -0,0 +1,13 @@
+package message
+
+type Deal struct {
+	SellerID     string `json:"sellerId"`
+	SellerCastle string `json:"sellerCastle"`
+	SellerName   string `json:"sellerName"`
+	BuyerID      string `json:"buyerId"`
+	BuyerCastle  string `json:"buyerCastle"`
+	BuyerName    string `json:"buyerName"`
+	Item         string `json:"item"`
+	Quantity     int    `json:"qty"`
+	Price        int    `json:"price"`
+}

pkg/message/duel.go

@@ -0,0 +1,17 @@
+package message
+
+type Duel struct {
+	Winner      DuelUser `json:"winner"`
+	Loser       DuelUser `json:"loser"`
+	IsChallenge bool     `json:"isChallenge"`
+	IsGuildDuel bool     `json:"isGuildDuel"`
+}
+
+type DuelUser struct {
+	ID     string `json:"id"`
+	Name   string `json:"name"`
+	Tag    string `json:"tag,omitempty"`
+	Castle string `json:"castle"`
+	Level  int    `json:"level"`
+	Health int    `json:"hp"`
+}

pkg/message/lot.go

@@ -0,0 +1,20 @@
+package message
+
+type Lot struct {
+	LotID        string `json:"lotId"`
+	ItemName     string `json:"itemName"`
+	SellerTag    string `json:"sellerTag"`
+	SellerName   string `json:"sellerName"`
+	Quality      string `json:"quality"`
+	SellerCastle string `json:"sellerCastle"`
+	Condition    string `json:"condition"`
+	EndAt        string `json:"endAt"`
+	StartAt      string `json:"startedAt"`
+	BuyerCastle  string `json:"buyerCastle"`
+	Status       string `json:"status"`
+	FinishedAt   string `json:"finishedAt"`
+	BuyerTag     string `json:"buyerTag"`
+	BuyerName    string `json:"buyerName"`
+	Price        int    `json:"price"`
+	Stats        map[string]int
+}

pkg/message/offer.go

@@ -0,0 +1,10 @@
+package message
+
+type Offer struct {
+	SellerID     string `json:"sellerId"`
+	SellerName   string `json:"sellerName"`
+	SellerCastle string `json:"sellerCastle"`
+	Item         string `json:"item"`
+	Quantity     int    `json:"qty"`
+	Price        int    `json:"price"`
+}

pkg/message/store.go

@@ -0,0 +1,23 @@
+package message
+
+type Store struct {
+	Link               string         `json:"link"`
+	Name               string         `json:"name"`
+	OwnerName          string         `json:"ownerName"`
+	OwnerCastle        string         `json:"ownerCastle"`
+	Kind               string         `json:"kind"`
+	Mana               int            `json:"mana"`
+	Offers             []StoreOffer   `json:"offers"`
+	Specialization     map[string]int `json:"specialization,omitempty"`
+	QualityCraftLevel  int            `json:"qualityCraftLevel"`
+	MaintenanceEnabled bool           `json:"maintenanceEnabled"`
+	MaintenanceCost    int            `json:"maintenanceCost"`
+	GuildDiscount      int            `json:"guildDiscount"`
+	CastleDiscount     int            `json:"castleDiscount"`
+}
+
+type StoreOffer struct {
+	Item  string `json:"item"`
+	Price int    `json:"price"`
+	Mana  int    `json:"mana"`
+}

pkg/storage/mongodb/user.go

@@ -0,0 +1,52 @@
+package mongodb
+
+import (
+	"context"
+	"errors"
+	"gitea.russia9.dev/Russia9/chatwars-spy/pkg/domain"
+	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/mongo"
+	"time"
+)
+
+func NewUserRepo(database *mongo.Database) domain.UserRepo {
+	return &userRepo{Collection: database.Collection("users")}
+}
+
+type userRepo struct {
+	Collection *mongo.Collection
+}
+
+func (r *userRepo) Store(ctx context.Context, object *domain.User) error {
+	cursor := r.Collection.FindOne(ctx, bson.M{"_id": object.ID})
+	if errors.Is(cursor.Err(), mongo.ErrNoDocuments) {
+		object.FirstSeen = time.Now()
+		object.LastSeen = time.Now()
+		_, err := r.Collection.InsertOne(ctx, object)
+		return err
+	} else if cursor.Err() != nil {
+		return cursor.Err()
+	}
+
+	// Get old user
+	var old domain.User
+	err := cursor.Decode(&old)
+	if err != nil {
+		return err
+	}
+
+	// Get old guild if empty
+	if object.Guild == "" {
+		object.Guild = old.Guild
+	}
+
+	// Set old source
+	object.Source = old.Source
+
+	// Set LastSeen date
+	object.LastSeen = time.Now()
+
+	// Update object in DB
+	_, err = r.Collection.ReplaceOne(ctx, bson.M{"_id": object.ID}, object)
+	return err
+}

vendor/github.com/confluentinc/confluent-kafka-go/LICENSE

@@ -0,0 +1,202 @@
+Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
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+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+   4. Redistribution. You may reproduce and distribute copies of the
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
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+      (c) You must retain, in the Source form of any Derivative Works
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+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
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+          of the following places: within a NOTICE text file distributed
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
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+   Copyright {yyyy} {name of copyright owner}
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+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+

vendor/github.com/confluentinc/confluent-kafka-go/kafka/.gitignore

@@ -0,0 +1,2 @@
+testconf.json
+go_rdkafka_generr/go_rdkafka_generr

vendor/github.com/confluentinc/confluent-kafka-go/kafka/00version.go

@@ -0,0 +1,58 @@
+package kafka
+
+/**
+ * Copyright 2016-2019 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+)
+
+/*
+#include "select_rdkafka.h"
+
+//Minimum required librdkafka version. This is checked both during
+//build-time and runtime.
+//Make sure to keep the MIN_RD_KAFKA_VERSION, MIN_VER_ERRSTR and #error
+//defines and strings in sync.
+//
+
+#define MIN_RD_KAFKA_VERSION 0x01060000
+
+#ifdef __APPLE__
+#define MIN_VER_ERRSTR "confluent-kafka-go requires librdkafka v1.6.0 or later. Install the latest version of librdkafka from Homebrew by running `brew install librdkafka` or `brew upgrade librdkafka`"
+#else
+#define MIN_VER_ERRSTR "confluent-kafka-go requires librdkafka v1.6.0 or later. Install the latest version of librdkafka from the Confluent repositories, see http://docs.confluent.io/current/installation.html"
+#endif
+
+#if RD_KAFKA_VERSION < MIN_RD_KAFKA_VERSION
+#ifdef __APPLE__
+#error "confluent-kafka-go requires librdkafka v1.6.0 or later. Install the latest version of librdkafka from Homebrew by running `brew install librdkafka` or `brew upgrade librdkafka`"
+#else
+#error "confluent-kafka-go requires librdkafka v1.6.0 or later. Install the latest version of librdkafka from the Confluent repositories, see http://docs.confluent.io/current/installation.html"
+#endif
+#endif
+*/
+import "C"
+
+func versionCheck() error {
+	ver, verstr := LibraryVersion()
+	if ver < C.MIN_RD_KAFKA_VERSION {
+		return newErrorFromString(ErrNotImplemented,
+			fmt.Sprintf("%s: librdkafka version %s (0x%x) detected",
+				C.MIN_VER_ERRSTR, verstr, ver))
+	}
+	return nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/README.md

@@ -0,0 +1,145 @@
+# Information for confluent-kafka-go developers
+
+Whenever librdkafka error codes are updated make sure to run generate
+before building:
+
+```
+  $ make -f mk/Makefile generr
+  $ go build ./...
+```
+
+
+
+
+## Testing
+
+Some of the tests included in this directory, the benchmark and integration tests in particular,
+require an existing Kafka cluster and a testconf.json configuration file to
+provide tests with bootstrap brokers, topic name, etc.
+
+The format of testconf.json is a JSON object:
+```
+{
+  "Brokers": "<bootstrap-brokers>",
+  "Topic": "<test-topic-name>"
+}
+```
+
+See testconf-example.json for an example and full set of available options.
+
+
+To run unit-tests:
+```
+$ go test
+```
+
+To run benchmark tests:
+```
+$ go test -bench .
+```
+
+For the code coverage:
+```
+$ go test -coverprofile=coverage.out -bench=.
+$ go tool cover -func=coverage.out
+```
+
+
+## Build tags
+
+Different build types are supported through Go build tags (`-tags ..`),
+these tags should be specified on the **application** build/get/install command.
+
+ * By default the bundled platform-specific static build of librdkafka will
+   be used. This works out of the box on Mac OSX and glibc-based Linux distros,
+   such as Ubuntu and CentOS.
+ * `-tags musl` - must be specified when building on/for musl-based Linux
+   distros, such as Alpine. Will use the bundled static musl build of
+   librdkafka.
+ * `-tags dynamic` - link librdkafka dynamically. A shared librdkafka library
+   must be installed manually through other means (apt-get, yum, build from
+   source, etc).
+
+
+
+## Generating HTML documentation
+
+To generate one-page HTML documentation run the mk/doc-gen.py script from the
+top-level directory. This script requires the beautifulsoup4 Python package.
+
+```
+$ source .../your/virtualenv/bin/activate
+$ pip install beautifulsoup4
+...
+$ make -f mk/Makefile docs
+```
+
+
+## Release process
+
+For each release candidate and final release, perform the following steps:
+
+### Update bundle to latest librdkafka
+
+See instructions in [kafka/librdkafka/README.md](kafka/librdkafka/README.md).
+
+
+### Update librdkafka version requirement
+
+Update the minimum required librdkafka version in `kafka/00version.go`
+and `README.md`.
+
+
+### Update error codes
+
+Error codes can be automatically generated from the current librdkafka version.
+
+
+Update generated error codes:
+
+    $ make -f mk/Makefile generr
+    # Verify by building
+
+
+### Rebuild everything
+
+    $ go clean -i ./...
+    $ go build ./...
+
+
+### Run full test suite
+
+Set up a test cluster using whatever mechanism you typically use
+(docker, trivup, ccloud, ..).
+
+Make sure to update `kafka/testconf.json` as needed (broker list, $BROKERS)
+
+Run test suite:
+
+    $ go test ./...
+
+
+### Verify examples
+
+Manually verify that the examples/ applications work.
+
+Also make sure the examples in README.md work.
+
+Convert any examples using `github.com/confluentinc/confluent-kafka-go/kafka` to use
+`gopkg.in/confluentinc/confluent-kafka-go.v1/kafka` import path.
+
+    $ find examples/ -type f -name *\.go -exec sed -i -e 's|github\.com/confluentinc/confluent-kafka-go/kafka|gopkg\.in/confluentinc/confluent-kafka-go\.v1/kafka|g' {} +
+
+### Commit any changes
+
+Make sure to push to github before creating the tag to have CI tests pass.
+
+
+### Create and push tag
+
+    $ git tag v1.3.0
+    $ git push --dry-run origin v1.3.0
+    # Remove --dry-run and re-execute if it looks ok.
+
+
+### Create release notes page on github

vendor/github.com/confluentinc/confluent-kafka-go/kafka/adminoptions.go

@@ -0,0 +1,264 @@
+/**
+ * Copyright 2018 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import (
+	"fmt"
+	"time"
+	"unsafe"
+)
+
+/*
+#include "select_rdkafka.h"
+#include <stdlib.h>
+*/
+import "C"
+
+// AdminOptionOperationTimeout sets the broker's operation timeout, such as the
+// timeout for CreateTopics to complete the creation of topics on the controller
+// before returning a result to the application.
+//
+// CreateTopics, DeleteTopics, CreatePartitions:
+// a value 0 will return immediately after triggering topic
+// creation, while > 0 will wait this long for topic creation to propagate
+// in cluster.
+//
+// Default: 0 (return immediately).
+//
+// Valid for CreateTopics, DeleteTopics, CreatePartitions.
+type AdminOptionOperationTimeout struct {
+	isSet bool
+	val   time.Duration
+}
+
+func (ao AdminOptionOperationTimeout) supportsCreateTopics() {
+}
+func (ao AdminOptionOperationTimeout) supportsDeleteTopics() {
+}
+func (ao AdminOptionOperationTimeout) supportsCreatePartitions() {
+}
+
+func (ao AdminOptionOperationTimeout) apply(cOptions *C.rd_kafka_AdminOptions_t) error {
+	if !ao.isSet {
+		return nil
+	}
+
+	cErrstrSize := C.size_t(512)
+	cErrstr := (*C.char)(C.malloc(cErrstrSize))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	cErr := C.rd_kafka_AdminOptions_set_operation_timeout(
+		cOptions, C.int(durationToMilliseconds(ao.val)),
+		cErrstr, cErrstrSize)
+	if cErr != 0 {
+		C.rd_kafka_AdminOptions_destroy(cOptions)
+		return newCErrorFromString(cErr,
+			fmt.Sprintf("Failed to set operation timeout: %s", C.GoString(cErrstr)))
+
+	}
+
+	return nil
+}
+
+// SetAdminOperationTimeout sets the broker's operation timeout, such as the
+// timeout for CreateTopics to complete the creation of topics on the controller
+// before returning a result to the application.
+//
+// CreateTopics, DeleteTopics, CreatePartitions:
+// a value 0 will return immediately after triggering topic
+// creation, while > 0 will wait this long for topic creation to propagate
+// in cluster.
+//
+// Default: 0 (return immediately).
+//
+// Valid for CreateTopics, DeleteTopics, CreatePartitions.
+func SetAdminOperationTimeout(t time.Duration) (ao AdminOptionOperationTimeout) {
+	ao.isSet = true
+	ao.val = t
+	return ao
+}
+
+// AdminOptionRequestTimeout sets the overall request timeout, including broker
+// lookup, request transmission, operation time on broker, and response.
+//
+// Default: `socket.timeout.ms`.
+//
+// Valid for all Admin API methods.
+type AdminOptionRequestTimeout struct {
+	isSet bool
+	val   time.Duration
+}
+
+func (ao AdminOptionRequestTimeout) supportsCreateTopics() {
+}
+func (ao AdminOptionRequestTimeout) supportsDeleteTopics() {
+}
+func (ao AdminOptionRequestTimeout) supportsCreatePartitions() {
+}
+func (ao AdminOptionRequestTimeout) supportsAlterConfigs() {
+}
+func (ao AdminOptionRequestTimeout) supportsDescribeConfigs() {
+}
+
+func (ao AdminOptionRequestTimeout) apply(cOptions *C.rd_kafka_AdminOptions_t) error {
+	if !ao.isSet {
+		return nil
+	}
+
+	cErrstrSize := C.size_t(512)
+	cErrstr := (*C.char)(C.malloc(cErrstrSize))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	cErr := C.rd_kafka_AdminOptions_set_request_timeout(
+		cOptions, C.int(durationToMilliseconds(ao.val)),
+		cErrstr, cErrstrSize)
+	if cErr != 0 {
+		C.rd_kafka_AdminOptions_destroy(cOptions)
+		return newCErrorFromString(cErr,
+			fmt.Sprintf("%s", C.GoString(cErrstr)))
+
+	}
+
+	return nil
+}
+
+// SetAdminRequestTimeout sets the overall request timeout, including broker
+// lookup, request transmission, operation time on broker, and response.
+//
+// Default: `socket.timeout.ms`.
+//
+// Valid for all Admin API methods.
+func SetAdminRequestTimeout(t time.Duration) (ao AdminOptionRequestTimeout) {
+	ao.isSet = true
+	ao.val = t
+	return ao
+}
+
+// AdminOptionValidateOnly tells the broker to only validate the request,
+// without performing the requested operation (create topics, etc).
+//
+// Default: false.
+//
+// Valid for CreateTopics, CreatePartitions, AlterConfigs
+type AdminOptionValidateOnly struct {
+	isSet bool
+	val   bool
+}
+
+func (ao AdminOptionValidateOnly) supportsCreateTopics() {
+}
+func (ao AdminOptionValidateOnly) supportsCreatePartitions() {
+}
+func (ao AdminOptionValidateOnly) supportsAlterConfigs() {
+}
+
+func (ao AdminOptionValidateOnly) apply(cOptions *C.rd_kafka_AdminOptions_t) error {
+	if !ao.isSet {
+		return nil
+	}
+
+	cErrstrSize := C.size_t(512)
+	cErrstr := (*C.char)(C.malloc(cErrstrSize))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	cErr := C.rd_kafka_AdminOptions_set_validate_only(
+		cOptions, bool2cint(ao.val),
+		cErrstr, cErrstrSize)
+	if cErr != 0 {
+		C.rd_kafka_AdminOptions_destroy(cOptions)
+		return newCErrorFromString(cErr,
+			fmt.Sprintf("%s", C.GoString(cErrstr)))
+
+	}
+
+	return nil
+}
+
+// SetAdminValidateOnly tells the broker to only validate the request,
+// without performing the requested operation (create topics, etc).
+//
+// Default: false.
+//
+// Valid for CreateTopics, DeleteTopics, CreatePartitions, AlterConfigs
+func SetAdminValidateOnly(validateOnly bool) (ao AdminOptionValidateOnly) {
+	ao.isSet = true
+	ao.val = validateOnly
+	return ao
+}
+
+// CreateTopicsAdminOption - see setters.
+//
+// See SetAdminRequestTimeout, SetAdminOperationTimeout, SetAdminValidateOnly.
+type CreateTopicsAdminOption interface {
+	supportsCreateTopics()
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+// DeleteTopicsAdminOption - see setters.
+//
+// See SetAdminRequestTimeout, SetAdminOperationTimeout.
+type DeleteTopicsAdminOption interface {
+	supportsDeleteTopics()
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+// CreatePartitionsAdminOption - see setters.
+//
+// See SetAdminRequestTimeout, SetAdminOperationTimeout, SetAdminValidateOnly.
+type CreatePartitionsAdminOption interface {
+	supportsCreatePartitions()
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+// AlterConfigsAdminOption - see setters.
+//
+// See SetAdminRequestTimeout, SetAdminValidateOnly, SetAdminIncremental.
+type AlterConfigsAdminOption interface {
+	supportsAlterConfigs()
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+// DescribeConfigsAdminOption - see setters.
+//
+// See SetAdminRequestTimeout.
+type DescribeConfigsAdminOption interface {
+	supportsDescribeConfigs()
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+// AdminOption is a generic type not to be used directly.
+//
+// See CreateTopicsAdminOption et.al.
+type AdminOption interface {
+	apply(cOptions *C.rd_kafka_AdminOptions_t) error
+}
+
+func adminOptionsSetup(h *handle, opType C.rd_kafka_admin_op_t, options []AdminOption) (*C.rd_kafka_AdminOptions_t, error) {
+
+	cOptions := C.rd_kafka_AdminOptions_new(h.rk, opType)
+	for _, opt := range options {
+		if opt == nil {
+			continue
+		}
+		err := opt.apply(cOptions)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return cOptions, nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/build_darwin.go

@@ -0,0 +1,13 @@
+// +build !dynamic
+
+
+// This file was auto-generated by librdkafka_vendor/bundle-import.sh, DO NOT EDIT.
+
+package kafka
+
+// #cgo CFLAGS: -DUSE_VENDORED_LIBRDKAFKA -DLIBRDKAFKA_STATICLIB
+// #cgo LDFLAGS: ${SRCDIR}/librdkafka_vendor/librdkafka_darwin.a  -lm -lsasl2 -ldl -lpthread
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "static darwin from librdkafka-static-bundle-v1.8.2.tgz"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/build_dynamic.go

@@ -0,0 +1,9 @@
+// +build dynamic
+
+package kafka
+
+// #cgo pkg-config: rdkafka
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "dynamically linked to librdkafka"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/build_glibc_linux.go

@@ -0,0 +1,13 @@
+// +build !dynamic
+// +build !musl
+
+// This file was auto-generated by librdkafka_vendor/bundle-import.sh, DO NOT EDIT.
+
+package kafka
+
+// #cgo CFLAGS: -DUSE_VENDORED_LIBRDKAFKA -DLIBRDKAFKA_STATICLIB
+// #cgo LDFLAGS: ${SRCDIR}/librdkafka_vendor/librdkafka_glibc_linux.a  -lm -ldl -lpthread -lrt
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "static glibc_linux from librdkafka-static-bundle-v1.8.2.tgz"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/build_musl_linux.go

@@ -0,0 +1,13 @@
+// +build !dynamic
+// +build musl
+
+// This file was auto-generated by librdkafka_vendor/bundle-import.sh, DO NOT EDIT.
+
+package kafka
+
+// #cgo CFLAGS: -DUSE_VENDORED_LIBRDKAFKA -DLIBRDKAFKA_STATICLIB
+// #cgo LDFLAGS: ${SRCDIR}/librdkafka_vendor/librdkafka_musl_linux.a  -lm -ldl -lpthread -lrt -lpthread -lrt
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "static musl_linux from librdkafka-static-bundle-v1.8.2.tgz"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/build_windows.go

@@ -0,0 +1,13 @@
+// +build !dynamic
+
+
+// This file was auto-generated by librdkafka_vendor/bundle-import.sh, DO NOT EDIT.
+
+package kafka
+
+// #cgo CFLAGS: -DUSE_VENDORED_LIBRDKAFKA -DLIBRDKAFKA_STATICLIB
+// #cgo LDFLAGS: ${SRCDIR}/librdkafka_vendor/librdkafka_windows.a  -lws2_32 -lsecur32 -lcrypt32
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "static windows from librdkafka-static-bundle-v1.8.2.tgz"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/config.go

@@ -0,0 +1,280 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"reflect"
+	"strings"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+*/
+import "C"
+
+// ConfigValue supports the following types:
+//  bool, int, string, any type with the standard String() interface
+type ConfigValue interface{}
+
+// ConfigMap is a map containing standard librdkafka configuration properties as documented in:
+// https://github.com/edenhill/librdkafka/tree/master/CONFIGURATION.md
+//
+// The special property "default.topic.config" (optional) is a ConfigMap
+// containing default topic configuration properties.
+//
+// The use of "default.topic.config" is deprecated,
+// topic configuration properties shall be specified in the standard ConfigMap.
+// For backwards compatibility, "default.topic.config" (if supplied)
+// takes precedence.
+type ConfigMap map[string]ConfigValue
+
+// SetKey sets configuration property key to value.
+//
+// For user convenience a key prefixed with {topic}. will be
+// set on the "default.topic.config" sub-map, this use is deprecated.
+func (m ConfigMap) SetKey(key string, value ConfigValue) error {
+	if strings.HasPrefix(key, "{topic}.") {
+		_, found := m["default.topic.config"]
+		if !found {
+			m["default.topic.config"] = ConfigMap{}
+		}
+		m["default.topic.config"].(ConfigMap)[strings.TrimPrefix(key, "{topic}.")] = value
+	} else {
+		m[key] = value
+	}
+
+	return nil
+}
+
+// Set implements flag.Set (command line argument parser) as a convenience
+// for `-X key=value` config.
+func (m ConfigMap) Set(kv string) error {
+	i := strings.Index(kv, "=")
+	if i == -1 {
+		return newErrorFromString(ErrInvalidArg, "Expected key=value")
+	}
+
+	k := kv[:i]
+	v := kv[i+1:]
+
+	return m.SetKey(k, v)
+}
+
+func value2string(v ConfigValue) (ret string, errstr string) {
+
+	switch x := v.(type) {
+	case bool:
+		if x {
+			ret = "true"
+		} else {
+			ret = "false"
+		}
+	case int:
+		ret = fmt.Sprintf("%d", x)
+	case string:
+		ret = x
+	case fmt.Stringer:
+		ret = x.String()
+	default:
+		return "", fmt.Sprintf("Invalid value type %T", v)
+	}
+
+	return ret, ""
+}
+
+// rdkAnyconf abstracts rd_kafka_conf_t and rd_kafka_topic_conf_t
+// into a common interface.
+type rdkAnyconf interface {
+	set(cKey *C.char, cVal *C.char, cErrstr *C.char, errstrSize int) C.rd_kafka_conf_res_t
+}
+
+func anyconfSet(anyconf rdkAnyconf, key string, val ConfigValue) (err error) {
+	value, errstr := value2string(val)
+	if errstr != "" {
+		return newErrorFromString(ErrInvalidArg, fmt.Sprintf("%s for key %s (expected string,bool,int,ConfigMap)", errstr, key))
+	}
+	cKey := C.CString(key)
+	defer C.free(unsafe.Pointer(cKey))
+	cVal := C.CString(value)
+	defer C.free(unsafe.Pointer(cVal))
+	cErrstr := (*C.char)(C.malloc(C.size_t(128)))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	if anyconf.set(cKey, cVal, cErrstr, 128) != C.RD_KAFKA_CONF_OK {
+		return newErrorFromCString(C.RD_KAFKA_RESP_ERR__INVALID_ARG, cErrstr)
+	}
+
+	return nil
+}
+
+// we need these typedefs to workaround a crash in golint
+// when parsing the set() methods below
+type rdkConf C.rd_kafka_conf_t
+type rdkTopicConf C.rd_kafka_topic_conf_t
+
+func (cConf *rdkConf) set(cKey *C.char, cVal *C.char, cErrstr *C.char, errstrSize int) C.rd_kafka_conf_res_t {
+	return C.rd_kafka_conf_set((*C.rd_kafka_conf_t)(cConf), cKey, cVal, cErrstr, C.size_t(errstrSize))
+}
+
+func (ctopicConf *rdkTopicConf) set(cKey *C.char, cVal *C.char, cErrstr *C.char, errstrSize int) C.rd_kafka_conf_res_t {
+	return C.rd_kafka_topic_conf_set((*C.rd_kafka_topic_conf_t)(ctopicConf), cKey, cVal, cErrstr, C.size_t(errstrSize))
+}
+
+func configConvertAnyconf(m ConfigMap, anyconf rdkAnyconf) (err error) {
+	// set plugins first, any plugin-specific configuration depends on
+	// the plugin to have already been set
+	pluginPaths, ok := m["plugin.library.paths"]
+	if ok {
+		err = anyconfSet(anyconf, "plugin.library.paths", pluginPaths)
+		if err != nil {
+			return err
+		}
+	}
+	for k, v := range m {
+		if k == "plugin.library.paths" {
+			continue
+		}
+		switch v.(type) {
+		case ConfigMap:
+			/* Special sub-ConfigMap, only used for default.topic.config */
+
+			if k != "default.topic.config" {
+				return newErrorFromString(ErrInvalidArg, fmt.Sprintf("Invalid type for key %s", k))
+			}
+
+			var cTopicConf = C.rd_kafka_topic_conf_new()
+
+			err = configConvertAnyconf(v.(ConfigMap),
+				(*rdkTopicConf)(cTopicConf))
+			if err != nil {
+				C.rd_kafka_topic_conf_destroy(cTopicConf)
+				return err
+			}
+
+			C.rd_kafka_conf_set_default_topic_conf(
+				(*C.rd_kafka_conf_t)(anyconf.(*rdkConf)),
+				(*C.rd_kafka_topic_conf_t)((*rdkTopicConf)(cTopicConf)))
+
+		default:
+			err = anyconfSet(anyconf, k, v)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// convert ConfigMap to C rd_kafka_conf_t *
+func (m ConfigMap) convert() (cConf *C.rd_kafka_conf_t, err error) {
+	cConf = C.rd_kafka_conf_new()
+
+	// Set the client.software.name and .version (use librdkafka version).
+	_, librdkafkaVersion := LibraryVersion()
+	anyconfSet((*rdkConf)(cConf), "client.software.name", "confluent-kafka-go")
+	anyconfSet((*rdkConf)(cConf), "client.software.version", librdkafkaVersion)
+
+	err = configConvertAnyconf(m, (*rdkConf)(cConf))
+	if err != nil {
+		C.rd_kafka_conf_destroy(cConf)
+		return nil, err
+	}
+	return cConf, nil
+}
+
+// get finds key in the configmap and returns its value.
+// If the key is not found defval is returned.
+// If the key is found but the type is mismatched an error is returned.
+func (m ConfigMap) get(key string, defval ConfigValue) (ConfigValue, error) {
+	if strings.HasPrefix(key, "{topic}.") {
+		defconfCv, found := m["default.topic.config"]
+		if !found {
+			return defval, nil
+		}
+		return defconfCv.(ConfigMap).get(strings.TrimPrefix(key, "{topic}."), defval)
+	}
+
+	v, ok := m[key]
+	if !ok {
+		return defval, nil
+	}
+
+	if defval != nil && reflect.TypeOf(defval) != reflect.TypeOf(v) {
+		return nil, newErrorFromString(ErrInvalidArg, fmt.Sprintf("%s expects type %T, not %T", key, defval, v))
+	}
+
+	return v, nil
+}
+
+// extract performs a get() and if found deletes the key.
+func (m ConfigMap) extract(key string, defval ConfigValue) (ConfigValue, error) {
+
+	v, err := m.get(key, defval)
+	if err != nil {
+		return nil, err
+	}
+
+	delete(m, key)
+
+	return v, nil
+}
+
+// extractLogConfig extracts generic go.logs.* configuration properties.
+func (m ConfigMap) extractLogConfig() (logsChanEnable bool, logsChan chan LogEvent, err error) {
+	v, err := m.extract("go.logs.channel.enable", false)
+	if err != nil {
+		return
+	}
+
+	logsChanEnable = v.(bool)
+
+	v, err = m.extract("go.logs.channel", nil)
+	if err != nil {
+		return
+	}
+
+	if v != nil {
+		logsChan = v.(chan LogEvent)
+	}
+
+	if logsChanEnable {
+		// Tell librdkafka to forward logs to the log queue
+		m.Set("log.queue=true")
+	}
+
+	return
+}
+
+func (m ConfigMap) clone() ConfigMap {
+	m2 := make(ConfigMap)
+	for k, v := range m {
+		m2[k] = v
+	}
+	return m2
+}
+
+// Get finds the given key in the ConfigMap and returns its value.
+// If the key is not found `defval` is returned.
+// If the key is found but the type does not match that of `defval` (unless nil)
+// an ErrInvalidArg error is returned.
+func (m ConfigMap) Get(key string, defval ConfigValue) (ConfigValue, error) {
+	return m.get(key, defval)
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/consumer.go

@@ -0,0 +1,923 @@
+package kafka
+
+/**
+ * Copyright 2016-2020 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"math"
+	"time"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+
+
+static rd_kafka_topic_partition_t *_c_rdkafka_topic_partition_list_entry(rd_kafka_topic_partition_list_t *rktparlist, int idx) {
+   return idx < rktparlist->cnt ? &rktparlist->elems[idx] : NULL;
+}
+*/
+import "C"
+
+// RebalanceCb provides a per-Subscribe*() rebalance event callback.
+// The passed Event will be either AssignedPartitions or RevokedPartitions
+type RebalanceCb func(*Consumer, Event) error
+
+// Consumer implements a High-level Apache Kafka Consumer instance
+type Consumer struct {
+	events             chan Event
+	handle             handle
+	eventsChanEnable   bool
+	readerTermChan     chan bool
+	rebalanceCb        RebalanceCb
+	appReassigned      bool
+	appRebalanceEnable bool // Config setting
+}
+
+// Strings returns a human readable name for a Consumer instance
+func (c *Consumer) String() string {
+	return c.handle.String()
+}
+
+// getHandle implements the Handle interface
+func (c *Consumer) gethandle() *handle {
+	return &c.handle
+}
+
+// Subscribe to a single topic
+// This replaces the current subscription
+func (c *Consumer) Subscribe(topic string, rebalanceCb RebalanceCb) error {
+	return c.SubscribeTopics([]string{topic}, rebalanceCb)
+}
+
+// SubscribeTopics subscribes to the provided list of topics.
+// This replaces the current subscription.
+func (c *Consumer) SubscribeTopics(topics []string, rebalanceCb RebalanceCb) (err error) {
+	ctopics := C.rd_kafka_topic_partition_list_new(C.int(len(topics)))
+	defer C.rd_kafka_topic_partition_list_destroy(ctopics)
+
+	for _, topic := range topics {
+		ctopic := C.CString(topic)
+		defer C.free(unsafe.Pointer(ctopic))
+		C.rd_kafka_topic_partition_list_add(ctopics, ctopic, C.RD_KAFKA_PARTITION_UA)
+	}
+
+	e := C.rd_kafka_subscribe(c.handle.rk, ctopics)
+	if e != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(e)
+	}
+
+	c.rebalanceCb = rebalanceCb
+
+	return nil
+}
+
+// Unsubscribe from the current subscription, if any.
+func (c *Consumer) Unsubscribe() (err error) {
+	C.rd_kafka_unsubscribe(c.handle.rk)
+	return nil
+}
+
+// Assign an atomic set of partitions to consume.
+//
+// The .Offset field of each TopicPartition must either be set to an absolute
+// starting offset (>= 0), or one of the logical offsets (`kafka.OffsetEnd` etc),
+// but should typically be set to `kafka.OffsetStored` to have the consumer
+// use the committed offset as a start position, with a fallback to
+// `auto.offset.reset` if there is no committed offset.
+//
+// This replaces the current assignment.
+func (c *Consumer) Assign(partitions []TopicPartition) (err error) {
+	c.appReassigned = true
+
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+
+	e := C.rd_kafka_assign(c.handle.rk, cparts)
+	if e != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(e)
+	}
+
+	return nil
+}
+
+// Unassign the current set of partitions to consume.
+func (c *Consumer) Unassign() (err error) {
+	c.appReassigned = true
+
+	e := C.rd_kafka_assign(c.handle.rk, nil)
+	if e != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(e)
+	}
+
+	return nil
+}
+
+// IncrementalAssign adds the specified partitions to the current set of
+// partitions to consume.
+//
+// The .Offset field of each TopicPartition must either be set to an absolute
+// starting offset (>= 0), or one of the logical offsets (`kafka.OffsetEnd` etc),
+// but should typically be set to `kafka.OffsetStored` to have the consumer
+// use the committed offset as a start position, with a fallback to
+// `auto.offset.reset` if there is no committed offset.
+//
+// The new partitions must not be part of the current assignment.
+func (c *Consumer) IncrementalAssign(partitions []TopicPartition) (err error) {
+	c.appReassigned = true
+
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+
+	cError := C.rd_kafka_incremental_assign(c.handle.rk, cparts)
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// IncrementalUnassign removes the specified partitions from the current set of
+// partitions to consume.
+//
+// The .Offset field of the TopicPartition is ignored.
+//
+// The removed partitions must be part of the current assignment.
+func (c *Consumer) IncrementalUnassign(partitions []TopicPartition) (err error) {
+	c.appReassigned = true
+
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+
+	cError := C.rd_kafka_incremental_unassign(c.handle.rk, cparts)
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// GetRebalanceProtocol returns the current consumer group rebalance protocol,
+// which is either "EAGER" or "COOPERATIVE".
+// If the rebalance protocol is not known in the current state an empty string
+// is returned.
+// Should typically only be called during rebalancing.
+func (c *Consumer) GetRebalanceProtocol() string {
+	cStr := C.rd_kafka_rebalance_protocol(c.handle.rk)
+	if cStr == nil {
+		return ""
+	}
+
+	return C.GoString(cStr)
+}
+
+// AssignmentLost returns true if current partition assignment has been lost.
+// This method is only applicable for use with a subscribing consumer when
+// handling a rebalance event or callback.
+// Partitions that have been lost may already be owned by other members in the
+// group and therefore commiting offsets, for example, may fail.
+func (c *Consumer) AssignmentLost() bool {
+	return cint2bool(C.rd_kafka_assignment_lost(c.handle.rk))
+}
+
+// commit offsets for specified offsets.
+// If offsets is nil the currently assigned partitions' offsets are committed.
+// This is a blocking call, caller will need to wrap in go-routine to
+// get async or throw-away behaviour.
+func (c *Consumer) commit(offsets []TopicPartition) (committedOffsets []TopicPartition, err error) {
+	var rkqu *C.rd_kafka_queue_t
+
+	rkqu = C.rd_kafka_queue_new(c.handle.rk)
+	defer C.rd_kafka_queue_destroy(rkqu)
+
+	var coffsets *C.rd_kafka_topic_partition_list_t
+	if offsets != nil {
+		coffsets = newCPartsFromTopicPartitions(offsets)
+		defer C.rd_kafka_topic_partition_list_destroy(coffsets)
+	}
+
+	cErr := C.rd_kafka_commit_queue(c.handle.rk, coffsets, rkqu, nil, nil)
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cErr)
+	}
+
+	rkev := C.rd_kafka_queue_poll(rkqu, C.int(-1))
+	if rkev == nil {
+		// shouldn't happen
+		return nil, newError(C.RD_KAFKA_RESP_ERR__DESTROY)
+	}
+	defer C.rd_kafka_event_destroy(rkev)
+
+	if C.rd_kafka_event_type(rkev) != C.RD_KAFKA_EVENT_OFFSET_COMMIT {
+		panic(fmt.Sprintf("Expected OFFSET_COMMIT, got %s",
+			C.GoString(C.rd_kafka_event_name(rkev))))
+	}
+
+	cErr = C.rd_kafka_event_error(rkev)
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newErrorFromCString(cErr, C.rd_kafka_event_error_string(rkev))
+	}
+
+	cRetoffsets := C.rd_kafka_event_topic_partition_list(rkev)
+	if cRetoffsets == nil {
+		// no offsets, no error
+		return nil, nil
+	}
+	committedOffsets = newTopicPartitionsFromCparts(cRetoffsets)
+
+	return committedOffsets, nil
+}
+
+// Commit offsets for currently assigned partitions
+// This is a blocking call.
+// Returns the committed offsets on success.
+func (c *Consumer) Commit() ([]TopicPartition, error) {
+	return c.commit(nil)
+}
+
+// CommitMessage commits offset based on the provided message.
+// This is a blocking call.
+// Returns the committed offsets on success.
+func (c *Consumer) CommitMessage(m *Message) ([]TopicPartition, error) {
+	if m.TopicPartition.Error != nil {
+		return nil, newErrorFromString(ErrInvalidArg, "Can't commit errored message")
+	}
+	offsets := []TopicPartition{m.TopicPartition}
+	offsets[0].Offset++
+	return c.commit(offsets)
+}
+
+// CommitOffsets commits the provided list of offsets
+// This is a blocking call.
+// Returns the committed offsets on success.
+func (c *Consumer) CommitOffsets(offsets []TopicPartition) ([]TopicPartition, error) {
+	return c.commit(offsets)
+}
+
+// StoreOffsets stores the provided list of offsets that will be committed
+// to the offset store according to `auto.commit.interval.ms` or manual
+// offset-less Commit().
+//
+// Returns the stored offsets on success. If at least one offset couldn't be stored,
+// an error and a list of offsets is returned. Each offset can be checked for
+// specific errors via its `.Error` member.
+func (c *Consumer) StoreOffsets(offsets []TopicPartition) (storedOffsets []TopicPartition, err error) {
+	coffsets := newCPartsFromTopicPartitions(offsets)
+	defer C.rd_kafka_topic_partition_list_destroy(coffsets)
+
+	cErr := C.rd_kafka_offsets_store(c.handle.rk, coffsets)
+
+	// coffsets might be annotated with an error
+	storedOffsets = newTopicPartitionsFromCparts(coffsets)
+
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return storedOffsets, newError(cErr)
+	}
+
+	return storedOffsets, nil
+}
+
+// StoreMessage stores offset based on the provided message.
+// This is a convenience method that uses StoreOffsets to do the actual work.
+func (c *Consumer) StoreMessage(m *Message) (storedOffsets []TopicPartition, err error) {
+	if m.TopicPartition.Error != nil {
+		return nil, newErrorFromString(ErrInvalidArg, "Can't store errored message")
+	}
+	if m.TopicPartition.Offset < 0 {
+		return nil, newErrorFromString(ErrInvalidArg, "Can't store message with offset less than 0")
+	}
+	offsets := []TopicPartition{m.TopicPartition}
+	offsets[0].Offset++
+	return c.StoreOffsets(offsets)
+}
+
+// Seek seeks the given topic partitions using the offset from the TopicPartition.
+//
+// If timeoutMs is not 0 the call will wait this long for the
+// seek to be performed. If the timeout is reached the internal state
+// will be unknown and this function returns ErrTimedOut.
+// If timeoutMs is 0 it will initiate the seek but return
+// immediately without any error reporting (e.g., async).
+//
+// Seek() may only be used for partitions already being consumed
+// (through Assign() or implicitly through a self-rebalanced Subscribe()).
+// To set the starting offset it is preferred to use Assign() and provide
+// a starting offset for each partition.
+//
+// Returns an error on failure or nil otherwise.
+func (c *Consumer) Seek(partition TopicPartition, timeoutMs int) error {
+	rkt := c.handle.getRkt(*partition.Topic)
+	cErr := C.rd_kafka_seek(rkt,
+		C.int32_t(partition.Partition),
+		C.int64_t(partition.Offset),
+		C.int(timeoutMs))
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(cErr)
+	}
+	return nil
+}
+
+// Poll the consumer for messages or events.
+//
+// Will block for at most timeoutMs milliseconds
+//
+// The following callbacks may be triggered:
+//   Subscribe()'s rebalanceCb
+//
+// Returns nil on timeout, else an Event
+func (c *Consumer) Poll(timeoutMs int) (event Event) {
+	ev, _ := c.handle.eventPoll(nil, timeoutMs, 1, nil)
+	return ev
+}
+
+// Events returns the Events channel (if enabled)
+func (c *Consumer) Events() chan Event {
+	return c.events
+}
+
+// Logs returns the log channel if enabled, or nil otherwise.
+func (c *Consumer) Logs() chan LogEvent {
+	return c.handle.logs
+}
+
+// ReadMessage polls the consumer for a message.
+//
+// This is a convenience API that wraps Poll() and only returns
+// messages or errors. All other event types are discarded.
+//
+// The call will block for at most `timeout` waiting for
+// a new message or error. `timeout` may be set to -1 for
+// indefinite wait.
+//
+// Timeout is returned as (nil, err) where err is `err.(kafka.Error).Code() == kafka.ErrTimedOut`.
+//
+// Messages are returned as (msg, nil),
+// while general errors are returned as (nil, err),
+// and partition-specific errors are returned as (msg, err) where
+// msg.TopicPartition provides partition-specific information (such as topic, partition and offset).
+//
+// All other event types, such as PartitionEOF, AssignedPartitions, etc, are silently discarded.
+//
+func (c *Consumer) ReadMessage(timeout time.Duration) (*Message, error) {
+
+	var absTimeout time.Time
+	var timeoutMs int
+
+	if timeout > 0 {
+		absTimeout = time.Now().Add(timeout)
+		timeoutMs = (int)(timeout.Seconds() * 1000.0)
+	} else {
+		timeoutMs = (int)(timeout)
+	}
+
+	for {
+		ev := c.Poll(timeoutMs)
+
+		switch e := ev.(type) {
+		case *Message:
+			if e.TopicPartition.Error != nil {
+				return e, e.TopicPartition.Error
+			}
+			return e, nil
+		case Error:
+			return nil, e
+		default:
+			// Ignore other event types
+		}
+
+		if timeout > 0 {
+			// Calculate remaining time
+			timeoutMs = int(math.Max(0.0, absTimeout.Sub(time.Now()).Seconds()*1000.0))
+		}
+
+		if timeoutMs == 0 && ev == nil {
+			return nil, newError(C.RD_KAFKA_RESP_ERR__TIMED_OUT)
+		}
+
+	}
+
+}
+
+// Close Consumer instance.
+// The object is no longer usable after this call.
+func (c *Consumer) Close() (err error) {
+
+	// Wait for consumerReader() or pollLogEvents to terminate (by closing readerTermChan)
+	close(c.readerTermChan)
+	c.handle.waitGroup.Wait()
+	if c.eventsChanEnable {
+		close(c.events)
+	}
+
+	// librdkafka's rd_kafka_consumer_close() will block
+	// and trigger the rebalance_cb() if one is set, if not, which is the
+	// case with the Go client since it registers EVENTs rather than callbacks,
+	// librdkafka will shortcut the rebalance_cb and do a forced unassign.
+	// But we can't have that since the application might need the final RevokePartitions
+	// before shutting down. So we trigger an Unsubscribe() first, wait for that to
+	// propagate (in the Poll loop below), and then close the consumer.
+	c.Unsubscribe()
+
+	// Poll for rebalance events
+	for {
+		c.Poll(10 * 1000)
+		if int(C.rd_kafka_queue_length(c.handle.rkq)) == 0 {
+			break
+		}
+	}
+
+	// Destroy our queue
+	C.rd_kafka_queue_destroy(c.handle.rkq)
+	c.handle.rkq = nil
+
+	// Close the consumer
+	C.rd_kafka_consumer_close(c.handle.rk)
+
+	c.handle.cleanup()
+
+	C.rd_kafka_destroy(c.handle.rk)
+
+	return nil
+}
+
+// NewConsumer creates a new high-level Consumer instance.
+//
+// conf is a *ConfigMap with standard librdkafka configuration properties.
+//
+// Supported special configuration properties:
+//   go.application.rebalance.enable (bool, false) - Forward rebalancing responsibility to application via the Events() channel.
+//                                        If set to true the app must handle the AssignedPartitions and
+//                                        RevokedPartitions events and call Assign() and Unassign()
+//                                        respectively.
+//   go.events.channel.enable (bool, false) - [deprecated] Enable the Events() channel. Messages and events will be pushed on the Events() channel and the Poll() interface will be disabled.
+//   go.events.channel.size (int, 1000) - Events() channel size
+//   go.logs.channel.enable (bool, false) - Forward log to Logs() channel.
+//   go.logs.channel (chan kafka.LogEvent, nil) - Forward logs to application-provided channel instead of Logs(). Requires go.logs.channel.enable=true.
+//
+// WARNING: Due to the buffering nature of channels (and queues in general) the
+// use of the events channel risks receiving outdated events and
+// messages. Minimizing go.events.channel.size reduces the risk
+// and number of outdated events and messages but does not eliminate
+// the factor completely. With a channel size of 1 at most one
+// event or message may be outdated.
+func NewConsumer(conf *ConfigMap) (*Consumer, error) {
+
+	err := versionCheck()
+	if err != nil {
+		return nil, err
+	}
+
+	// before we do anything with the configuration, create a copy such that
+	// the original is not mutated.
+	confCopy := conf.clone()
+
+	groupid, _ := confCopy.get("group.id", nil)
+	if groupid == nil {
+		// without a group.id the underlying cgrp subsystem in librdkafka wont get started
+		// and without it there is no way to consume assigned partitions.
+		// So for now require the group.id, this might change in the future.
+		return nil, newErrorFromString(ErrInvalidArg, "Required property group.id not set")
+	}
+
+	c := &Consumer{}
+
+	v, err := confCopy.extract("go.application.rebalance.enable", false)
+	if err != nil {
+		return nil, err
+	}
+	c.appRebalanceEnable = v.(bool)
+
+	v, err = confCopy.extract("go.events.channel.enable", false)
+	if err != nil {
+		return nil, err
+	}
+	c.eventsChanEnable = v.(bool)
+
+	v, err = confCopy.extract("go.events.channel.size", 1000)
+	if err != nil {
+		return nil, err
+	}
+	eventsChanSize := v.(int)
+
+	logsChanEnable, logsChan, err := confCopy.extractLogConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	cConf, err := confCopy.convert()
+	if err != nil {
+		return nil, err
+	}
+	cErrstr := (*C.char)(C.malloc(C.size_t(256)))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	C.rd_kafka_conf_set_events(cConf, C.RD_KAFKA_EVENT_REBALANCE|C.RD_KAFKA_EVENT_OFFSET_COMMIT|C.RD_KAFKA_EVENT_STATS|C.RD_KAFKA_EVENT_ERROR|C.RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH)
+
+	c.handle.rk = C.rd_kafka_new(C.RD_KAFKA_CONSUMER, cConf, cErrstr, 256)
+	if c.handle.rk == nil {
+		return nil, newErrorFromCString(C.RD_KAFKA_RESP_ERR__INVALID_ARG, cErrstr)
+	}
+
+	C.rd_kafka_poll_set_consumer(c.handle.rk)
+
+	c.handle.c = c
+	c.handle.setup()
+	c.readerTermChan = make(chan bool)
+	c.handle.rkq = C.rd_kafka_queue_get_consumer(c.handle.rk)
+	if c.handle.rkq == nil {
+		// no cgrp (no group.id configured), revert to main queue.
+		c.handle.rkq = C.rd_kafka_queue_get_main(c.handle.rk)
+	}
+
+	if logsChanEnable {
+		c.handle.setupLogQueue(logsChan, c.readerTermChan)
+	}
+
+	if c.eventsChanEnable {
+		c.events = make(chan Event, eventsChanSize)
+		/* Start rdkafka consumer queue reader -> events writer goroutine */
+		c.handle.waitGroup.Add(1)
+		go func() {
+			consumerReader(c, c.readerTermChan)
+			c.handle.waitGroup.Done()
+		}()
+	}
+
+	return c, nil
+}
+
+// consumerReader reads messages and events from the librdkafka consumer queue
+// and posts them on the consumer channel.
+// Runs until termChan closes
+func consumerReader(c *Consumer, termChan chan bool) {
+	for {
+		select {
+		case _ = <-termChan:
+			return
+		default:
+			_, term := c.handle.eventPoll(c.events, 100, 1000, termChan)
+			if term {
+				return
+			}
+
+		}
+	}
+}
+
+// GetMetadata queries broker for cluster and topic metadata.
+// If topic is non-nil only information about that topic is returned, else if
+// allTopics is false only information about locally used topics is returned,
+// else information about all topics is returned.
+// GetMetadata is equivalent to listTopics, describeTopics and describeCluster in the Java API.
+func (c *Consumer) GetMetadata(topic *string, allTopics bool, timeoutMs int) (*Metadata, error) {
+	return getMetadata(c, topic, allTopics, timeoutMs)
+}
+
+// QueryWatermarkOffsets queries the broker for the low and high offsets for the given topic and partition.
+func (c *Consumer) QueryWatermarkOffsets(topic string, partition int32, timeoutMs int) (low, high int64, err error) {
+	return queryWatermarkOffsets(c, topic, partition, timeoutMs)
+}
+
+// GetWatermarkOffsets returns the cached low and high offsets for the given topic
+// and partition.  The high offset is populated on every fetch response or via calling QueryWatermarkOffsets.
+// The low offset is populated every statistics.interval.ms if that value is set.
+// OffsetInvalid will be returned if there is no cached offset for either value.
+func (c *Consumer) GetWatermarkOffsets(topic string, partition int32) (low, high int64, err error) {
+	return getWatermarkOffsets(c, topic, partition)
+}
+
+// OffsetsForTimes looks up offsets by timestamp for the given partitions.
+//
+// The returned offset for each partition is the earliest offset whose
+// timestamp is greater than or equal to the given timestamp in the
+// corresponding partition. If the provided timestamp exceeds that of the
+// last message in the partition, a value of -1 will be returned.
+//
+// The timestamps to query are represented as `.Offset` in the `times`
+// argument and the looked up offsets are represented as `.Offset` in the returned
+// `offsets` list.
+//
+// The function will block for at most timeoutMs milliseconds.
+//
+// Duplicate Topic+Partitions are not supported.
+// Per-partition errors may be returned in the `.Error` field.
+func (c *Consumer) OffsetsForTimes(times []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error) {
+	return offsetsForTimes(c, times, timeoutMs)
+}
+
+// Subscription returns the current subscription as set by Subscribe()
+func (c *Consumer) Subscription() (topics []string, err error) {
+	var cTopics *C.rd_kafka_topic_partition_list_t
+
+	cErr := C.rd_kafka_subscription(c.handle.rk, &cTopics)
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cErr)
+	}
+	defer C.rd_kafka_topic_partition_list_destroy(cTopics)
+
+	topicCnt := int(cTopics.cnt)
+	topics = make([]string, topicCnt)
+	for i := 0; i < topicCnt; i++ {
+		crktpar := C._c_rdkafka_topic_partition_list_entry(cTopics,
+			C.int(i))
+		topics[i] = C.GoString(crktpar.topic)
+	}
+
+	return topics, nil
+}
+
+// Assignment returns the current partition assignments
+func (c *Consumer) Assignment() (partitions []TopicPartition, err error) {
+	var cParts *C.rd_kafka_topic_partition_list_t
+
+	cErr := C.rd_kafka_assignment(c.handle.rk, &cParts)
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cErr)
+	}
+	defer C.rd_kafka_topic_partition_list_destroy(cParts)
+
+	partitions = newTopicPartitionsFromCparts(cParts)
+
+	return partitions, nil
+}
+
+// Committed retrieves committed offsets for the given set of partitions
+func (c *Consumer) Committed(partitions []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error) {
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+	cerr := C.rd_kafka_committed(c.handle.rk, cparts, C.int(timeoutMs))
+	if cerr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cerr)
+	}
+
+	return newTopicPartitionsFromCparts(cparts), nil
+}
+
+// Position returns the current consume position for the given partitions.
+// Typical use is to call Assignment() to get the partition list
+// and then pass it to Position() to get the current consume position for
+// each of the assigned partitions.
+// The consume position is the next message to read from the partition.
+// i.e., the offset of the last message seen by the application + 1.
+func (c *Consumer) Position(partitions []TopicPartition) (offsets []TopicPartition, err error) {
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+	cerr := C.rd_kafka_position(c.handle.rk, cparts)
+	if cerr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cerr)
+	}
+
+	return newTopicPartitionsFromCparts(cparts), nil
+}
+
+// Pause consumption for the provided list of partitions
+//
+// Note that messages already enqueued on the consumer's Event channel
+// (if `go.events.channel.enable` has been set) will NOT be purged by
+// this call, set `go.events.channel.size` accordingly.
+func (c *Consumer) Pause(partitions []TopicPartition) (err error) {
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+	cerr := C.rd_kafka_pause_partitions(c.handle.rk, cparts)
+	if cerr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(cerr)
+	}
+	return nil
+}
+
+// Resume consumption for the provided list of partitions
+func (c *Consumer) Resume(partitions []TopicPartition) (err error) {
+	cparts := newCPartsFromTopicPartitions(partitions)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+	cerr := C.rd_kafka_resume_partitions(c.handle.rk, cparts)
+	if cerr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(cerr)
+	}
+	return nil
+}
+
+// SetOAuthBearerToken sets the the data to be transmitted
+// to a broker during SASL/OAUTHBEARER authentication. It will return nil
+// on success, otherwise an error if:
+// 1) the token data is invalid (meaning an expiration time in the past
+// or either a token value or an extension key or value that does not meet
+// the regular expression requirements as per
+// https://tools.ietf.org/html/rfc7628#section-3.1);
+// 2) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+// 3) SASL/OAUTHBEARER is supported but is not configured as the client's
+// authentication mechanism.
+func (c *Consumer) SetOAuthBearerToken(oauthBearerToken OAuthBearerToken) error {
+	return c.handle.setOAuthBearerToken(oauthBearerToken)
+}
+
+// SetOAuthBearerTokenFailure sets the error message describing why token
+// retrieval/setting failed; it also schedules a new token refresh event for 10
+// seconds later so the attempt may be retried. It will return nil on
+// success, otherwise an error if:
+// 1) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+// 2) SASL/OAUTHBEARER is supported but is not configured as the client's
+// authentication mechanism.
+func (c *Consumer) SetOAuthBearerTokenFailure(errstr string) error {
+	return c.handle.setOAuthBearerTokenFailure(errstr)
+}
+
+// ConsumerGroupMetadata reflects the current consumer group member metadata.
+type ConsumerGroupMetadata struct {
+	serialized []byte
+}
+
+// serializeConsumerGroupMetadata converts a C metadata object to its
+// binary representation so we don't have to hold on to the C object,
+// which would require an explicit .Close().
+func serializeConsumerGroupMetadata(cgmd *C.rd_kafka_consumer_group_metadata_t) ([]byte, error) {
+	var cBuffer *C.void
+	var cSize C.size_t
+	cError := C.rd_kafka_consumer_group_metadata_write(cgmd,
+		(*unsafe.Pointer)(unsafe.Pointer(&cBuffer)), &cSize)
+	if cError != nil {
+		return nil, newErrorFromCErrorDestroy(cError)
+	}
+	defer C.rd_kafka_mem_free(nil, unsafe.Pointer(cBuffer))
+
+	return C.GoBytes(unsafe.Pointer(cBuffer), C.int(cSize)), nil
+}
+
+// deserializeConsumerGroupMetadata converts a serialized metadata object
+// back to a C object.
+func deserializeConsumerGroupMetadata(serialized []byte) (*C.rd_kafka_consumer_group_metadata_t, error) {
+	var cgmd *C.rd_kafka_consumer_group_metadata_t
+
+	cSerialized := C.CBytes(serialized)
+	defer C.free(cSerialized)
+
+	cError := C.rd_kafka_consumer_group_metadata_read(
+		&cgmd, cSerialized, C.size_t(len(serialized)))
+	if cError != nil {
+		return nil, newErrorFromCErrorDestroy(cError)
+	}
+
+	return cgmd, nil
+}
+
+// GetConsumerGroupMetadata returns the consumer's current group metadata.
+// This object should be passed to the transactional producer's
+// SendOffsetsToTransaction() API.
+func (c *Consumer) GetConsumerGroupMetadata() (*ConsumerGroupMetadata, error) {
+	cgmd := C.rd_kafka_consumer_group_metadata(c.handle.rk)
+	if cgmd == nil {
+		return nil, NewError(ErrState, "Consumer group metadata not available", false)
+	}
+	defer C.rd_kafka_consumer_group_metadata_destroy(cgmd)
+
+	serialized, err := serializeConsumerGroupMetadata(cgmd)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ConsumerGroupMetadata{serialized}, nil
+}
+
+// NewTestConsumerGroupMetadata creates a new consumer group metadata instance
+// mainly for testing use.
+// Use GetConsumerGroupMetadata() to retrieve the real metadata.
+func NewTestConsumerGroupMetadata(groupID string) (*ConsumerGroupMetadata, error) {
+	cGroupID := C.CString(groupID)
+	defer C.free(unsafe.Pointer(cGroupID))
+
+	cgmd := C.rd_kafka_consumer_group_metadata_new(cGroupID)
+	if cgmd == nil {
+		return nil, NewError(ErrInvalidArg, "Failed to create metadata object", false)
+	}
+
+	defer C.rd_kafka_consumer_group_metadata_destroy(cgmd)
+	serialized, err := serializeConsumerGroupMetadata(cgmd)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ConsumerGroupMetadata{serialized}, nil
+}
+
+// cEventToRebalanceEvent returns an Event (AssignedPartitions or RevokedPartitions)
+// based on the specified rkev.
+func cEventToRebalanceEvent(rkev *C.rd_kafka_event_t) Event {
+	if C.rd_kafka_event_error(rkev) == C.RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS {
+		var ev AssignedPartitions
+		ev.Partitions = newTopicPartitionsFromCparts(C.rd_kafka_event_topic_partition_list(rkev))
+		return ev
+	} else if C.rd_kafka_event_error(rkev) == C.RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS {
+		var ev RevokedPartitions
+		ev.Partitions = newTopicPartitionsFromCparts(C.rd_kafka_event_topic_partition_list(rkev))
+		return ev
+	} else {
+		panic(fmt.Sprintf("Unable to create rebalance event from C type %s",
+			C.GoString(C.rd_kafka_err2name(C.rd_kafka_event_error(rkev)))))
+	}
+
+}
+
+// handleRebalanceEvent handles a assign/rebalance rebalance event.
+//
+// If the app provided a RebalanceCb to Subscribe*() or
+// has go.application.rebalance.enable=true we create an event
+// and forward it to the application thru the RebalanceCb or the
+// Events channel respectively.
+// Since librdkafka requires the rebalance event to be "acked" by
+// the application (by calling *assign()) to synchronize state we keep track
+// of if the application performed *Assign() or *Unassign(), but this only
+// works for the non-channel case. For the channel case we assume the
+// application calls *Assign() or *Unassign().
+// Failure to do so will "hang" the consumer, e.g., it wont start consuming
+// and it wont close cleanly, so this error case should be visible
+// immediately to the application developer.
+//
+// In the polling case (not channel based consumer) the rebalance event
+// is returned in retval, else nil is returned.
+
+func (c *Consumer) handleRebalanceEvent(channel chan Event, rkev *C.rd_kafka_event_t) (retval Event) {
+
+	var ev Event
+
+	if c.rebalanceCb != nil || c.appRebalanceEnable {
+		// Application has a rebalance callback or has enabled
+		// rebalances on the events channel, create the appropriate Event.
+		ev = cEventToRebalanceEvent(rkev)
+
+	}
+
+	if channel != nil && c.appRebalanceEnable && c.rebalanceCb == nil {
+		// Channel-based consumer with rebalancing enabled,
+		// return the rebalance event and rely on the application
+		// to call *Assign() / *Unassign().
+		return ev
+	}
+
+	// Call the application's rebalance callback, if any.
+	if c.rebalanceCb != nil {
+		// Mark .appReassigned as false to keep track of whether the
+		// application called *Assign() / *Unassign().
+		c.appReassigned = false
+
+		c.rebalanceCb(c, ev)
+
+		if c.appReassigned {
+			// Rebalance event handled by application.
+			return nil
+		}
+	}
+
+	// Either there was no rebalance callback, or the application
+	// did not call *Assign / *Unassign, so we need to do it.
+
+	isCooperative := c.GetRebalanceProtocol() == "COOPERATIVE"
+	var cError *C.rd_kafka_error_t
+	var cErr C.rd_kafka_resp_err_t
+
+	if C.rd_kafka_event_error(rkev) == C.RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS {
+		// Assign partitions
+		if isCooperative {
+			cError = C.rd_kafka_incremental_assign(
+				c.handle.rk,
+				C.rd_kafka_event_topic_partition_list(rkev))
+		} else {
+			cErr = C.rd_kafka_assign(
+				c.handle.rk,
+				C.rd_kafka_event_topic_partition_list(rkev))
+		}
+	} else {
+		// Revoke partitions
+
+		if isCooperative {
+			cError = C.rd_kafka_incremental_unassign(
+				c.handle.rk,
+				C.rd_kafka_event_topic_partition_list(rkev))
+		} else {
+			cErr = C.rd_kafka_assign(c.handle.rk, nil)
+		}
+	}
+
+	// If the *assign() call returned error, forward it to the
+	// the consumer's Events() channel for visibility.
+	if cError != nil {
+		c.events <- newErrorFromCErrorDestroy(cError)
+	} else if cErr != 0 {
+		c.events <- newError(cErr)
+	}
+
+	return nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/context.go

@@ -0,0 +1,31 @@
+/**
+ * Copyright 2019 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import (
+	"context"
+	"time"
+)
+
+// Timeout returns the remaining time after which work done on behalf of this context should be
+// canceled, or ok==false if no deadline/timeout is set.
+func timeout(ctx context.Context) (timeout time.Duration, ok bool) {
+	if deadline, ok := ctx.Deadline(); ok {
+		return deadline.Sub(time.Now()), true
+	}
+	return 0, false
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/error.go

@@ -0,0 +1,154 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Automatically generate error codes from librdkafka
+// See README for instructions
+//go:generate $GOPATH/bin/go_rdkafka_generr generated_errors.go
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+*/
+import "C"
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+// Error provides a Kafka-specific error container
+type Error struct {
+	code             ErrorCode
+	str              string
+	fatal            bool
+	retriable        bool
+	txnRequiresAbort bool
+}
+
+func newError(code C.rd_kafka_resp_err_t) (err Error) {
+	return Error{code: ErrorCode(code)}
+}
+
+// NewError creates a new Error.
+func NewError(code ErrorCode, str string, fatal bool) (err Error) {
+	return Error{code: code, str: str, fatal: fatal}
+}
+
+func newErrorFromString(code ErrorCode, str string) (err Error) {
+	return Error{code: code, str: str}
+}
+
+func newErrorFromCString(code C.rd_kafka_resp_err_t, cstr *C.char) (err Error) {
+	var str string
+	if cstr != nil {
+		str = C.GoString(cstr)
+	} else {
+		str = ""
+	}
+	return Error{code: ErrorCode(code), str: str}
+}
+
+func newCErrorFromString(code C.rd_kafka_resp_err_t, str string) (err Error) {
+	return newErrorFromString(ErrorCode(code), str)
+}
+
+// newErrorFromCError creates a new Error instance and destroys
+// the passed cError.
+func newErrorFromCErrorDestroy(cError *C.rd_kafka_error_t) Error {
+	defer C.rd_kafka_error_destroy(cError)
+	return Error{
+		code:             ErrorCode(C.rd_kafka_error_code(cError)),
+		str:              C.GoString(C.rd_kafka_error_string(cError)),
+		fatal:            cint2bool(C.rd_kafka_error_is_fatal(cError)),
+		retriable:        cint2bool(C.rd_kafka_error_is_retriable(cError)),
+		txnRequiresAbort: cint2bool(C.rd_kafka_error_txn_requires_abort(cError)),
+	}
+}
+
+// Error returns a human readable representation of an Error
+// Same as Error.String()
+func (e Error) Error() string {
+	return e.String()
+}
+
+// String returns a human readable representation of an Error
+func (e Error) String() string {
+	var errstr string
+	if len(e.str) > 0 {
+		errstr = e.str
+	} else {
+		errstr = e.code.String()
+	}
+
+	if e.IsFatal() {
+		return fmt.Sprintf("Fatal error: %s", errstr)
+	}
+
+	return errstr
+}
+
+// Code returns the ErrorCode of an Error
+func (e Error) Code() ErrorCode {
+	return e.code
+}
+
+// IsFatal returns true if the error is a fatal error.
+// A fatal error indicates the client instance is no longer operable and
+// should be terminated. Typical causes include non-recoverable
+// idempotent producer errors.
+func (e Error) IsFatal() bool {
+	return e.fatal
+}
+
+// IsRetriable returns true if the operation that caused this error
+// may be retried.
+// This flag is currently only set by the Transactional producer API.
+func (e Error) IsRetriable() bool {
+	return e.retriable
+}
+
+// TxnRequiresAbort returns true if the error is an abortable transaction error
+// that requires the application to abort the current transaction with
+// AbortTransaction() and start a new transaction with BeginTransaction()
+// if it wishes to proceed with transactional operations.
+// This flag is only set by the Transactional producer API.
+func (e Error) TxnRequiresAbort() bool {
+	return e.txnRequiresAbort
+}
+
+// getFatalError returns an Error object if the client instance has raised a fatal error, else nil.
+func getFatalError(H Handle) error {
+	cErrstr := (*C.char)(C.malloc(C.size_t(512)))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	cErr := C.rd_kafka_fatal_error(H.gethandle().rk, cErrstr, 512)
+	if int(cErr) == 0 {
+		return nil
+	}
+
+	err := newErrorFromCString(cErr, cErrstr)
+	err.fatal = true
+
+	return err
+}
+
+// testFatalError triggers a fatal error in the underlying client.
+// This is to be used strictly for testing purposes.
+func testFatalError(H Handle, code ErrorCode, str string) ErrorCode {
+	return ErrorCode(C.rd_kafka_test_fatal_error(H.gethandle().rk, C.rd_kafka_resp_err_t(code), C.CString(str)))
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/error_gen.go

@@ -0,0 +1,112 @@
+package kafka
+
+/**
+ * Copyright 2020 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Automatically generate error codes from librdkafka
+// See README for instructions
+//go:generate $GOPATH/bin/go_rdkafka_generr generated_errors.go
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+
+static const char *errdesc_to_string (const struct rd_kafka_err_desc *ed, int idx) {
+   return ed[idx].name;
+}
+
+static const char *errdesc_to_desc (const struct rd_kafka_err_desc *ed, int idx) {
+   return ed[idx].desc;
+}
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+// camelCase transforms a snake_case string to camelCase.
+func camelCase(s string) string {
+	ret := ""
+	for _, v := range strings.Split(s, "_") {
+		if len(v) == 0 {
+			continue
+		}
+		ret += strings.ToUpper((string)(v[0])) + strings.ToLower(v[1:])
+	}
+	return ret
+}
+
+// WriteErrorCodes writes Go error code constants to file from the
+// librdkafka error codes.
+// This function is not intended for public use.
+func WriteErrorCodes(f *os.File) {
+	f.WriteString("package kafka\n")
+	now := time.Now()
+	f.WriteString(fmt.Sprintf("// Copyright 2016-%d Confluent Inc.\n", now.Year()))
+	f.WriteString(fmt.Sprintf("// AUTOMATICALLY GENERATED ON %v USING librdkafka %s\n",
+		now, C.GoString(C.rd_kafka_version_str())))
+
+	var errdescs *C.struct_rd_kafka_err_desc
+	var csize C.size_t
+	C.rd_kafka_get_err_descs(&errdescs, &csize)
+
+	f.WriteString(`
+/*
+#include "select_rdkafka.h"
+*/
+import "C"
+
+// ErrorCode is the integer representation of local and broker error codes
+type ErrorCode int
+
+// String returns a human readable representation of an error code
+func (c ErrorCode) String() string {
+      return C.GoString(C.rd_kafka_err2str(C.rd_kafka_resp_err_t(c)))
+}
+
+const (
+`)
+
+	for i := 0; i < int(csize); i++ {
+		orig := C.GoString(C.errdesc_to_string(errdescs, C.int(i)))
+		if len(orig) == 0 {
+			continue
+		}
+		desc := C.GoString(C.errdesc_to_desc(errdescs, C.int(i)))
+		if len(desc) == 0 {
+			continue
+		}
+
+		errname := "Err" + camelCase(orig)
+
+		// Special handling to please golint
+		// Eof -> EOF
+		// Id -> ID
+		errname = strings.Replace(errname, "Eof", "EOF", -1)
+		errname = strings.Replace(errname, "Id", "ID", -1)
+
+		f.WriteString(fmt.Sprintf("    // %s %s\n", errname, desc))
+		f.WriteString(fmt.Sprintf("    %s ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_%s)\n",
+			errname, orig))
+	}
+
+	f.WriteString(")\n")
+
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/event.go

@@ -0,0 +1,316 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"os"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+#include "glue_rdkafka.h"
+
+
+void chdrs_to_tmphdrs (glue_msg_t *gMsg) {
+    size_t i = 0;
+    const char *name;
+    const void *val;
+    size_t size;
+    rd_kafka_headers_t *chdrs;
+
+    if (rd_kafka_message_headers(gMsg->msg, &chdrs)) {
+        gMsg->tmphdrs = NULL;
+        gMsg->tmphdrsCnt = 0;
+        return;
+    }
+
+    gMsg->tmphdrsCnt = rd_kafka_header_cnt(chdrs);
+    gMsg->tmphdrs = malloc(sizeof(*gMsg->tmphdrs) * gMsg->tmphdrsCnt);
+
+    while (!rd_kafka_header_get_all(chdrs, i,
+                                    &gMsg->tmphdrs[i].key,
+                                    &gMsg->tmphdrs[i].val,
+                                    (size_t *)&gMsg->tmphdrs[i].size))
+        i++;
+}
+
+rd_kafka_event_t *_rk_queue_poll (rd_kafka_queue_t *rkq, int timeoutMs,
+                                  rd_kafka_event_type_t *evtype,
+                                  glue_msg_t *gMsg,
+                                  rd_kafka_event_t *prev_rkev) {
+    rd_kafka_event_t *rkev;
+
+    if (prev_rkev)
+      rd_kafka_event_destroy(prev_rkev);
+
+    rkev = rd_kafka_queue_poll(rkq, timeoutMs);
+    *evtype = rd_kafka_event_type(rkev);
+
+    if (*evtype == RD_KAFKA_EVENT_FETCH) {
+        gMsg->msg = (rd_kafka_message_t *)rd_kafka_event_message_next(rkev);
+        gMsg->ts = rd_kafka_message_timestamp(gMsg->msg, &gMsg->tstype);
+
+        if (gMsg->want_hdrs)
+            chdrs_to_tmphdrs(gMsg);
+    }
+
+    return rkev;
+}
+*/
+import "C"
+
+func chdrsToTmphdrs(gMsg *C.glue_msg_t) {
+	C.chdrs_to_tmphdrs(gMsg)
+}
+
+// Event generic interface
+type Event interface {
+	// String returns a human-readable representation of the event
+	String() string
+}
+
+// Specific event types
+
+// Stats statistics event
+type Stats struct {
+	statsJSON string
+}
+
+func (e Stats) String() string {
+	return e.statsJSON
+}
+
+// AssignedPartitions consumer group rebalance event: assigned partition set
+type AssignedPartitions struct {
+	Partitions []TopicPartition
+}
+
+func (e AssignedPartitions) String() string {
+	return fmt.Sprintf("AssignedPartitions: %v", e.Partitions)
+}
+
+// RevokedPartitions consumer group rebalance event: revoked partition set
+type RevokedPartitions struct {
+	Partitions []TopicPartition
+}
+
+func (e RevokedPartitions) String() string {
+	return fmt.Sprintf("RevokedPartitions: %v", e.Partitions)
+}
+
+// PartitionEOF consumer reached end of partition
+// Needs to be explicitly enabled by setting the `enable.partition.eof`
+// configuration property to true.
+type PartitionEOF TopicPartition
+
+func (p PartitionEOF) String() string {
+	return fmt.Sprintf("EOF at %s", TopicPartition(p))
+}
+
+// OffsetsCommitted reports committed offsets
+type OffsetsCommitted struct {
+	Error   error
+	Offsets []TopicPartition
+}
+
+func (o OffsetsCommitted) String() string {
+	return fmt.Sprintf("OffsetsCommitted (%v, %v)", o.Error, o.Offsets)
+}
+
+// OAuthBearerTokenRefresh indicates token refresh is required
+type OAuthBearerTokenRefresh struct {
+	// Config is the value of the sasl.oauthbearer.config property
+	Config string
+}
+
+func (o OAuthBearerTokenRefresh) String() string {
+	return "OAuthBearerTokenRefresh"
+}
+
+// eventPoll polls an event from the handler's C rd_kafka_queue_t,
+// translates it into an Event type and then sends on `channel` if non-nil, else returns the Event.
+// term_chan is an optional channel to monitor along with producing to channel
+// to indicate that `channel` is being terminated.
+// returns (event Event, terminate Bool) tuple, where Terminate indicates
+// if termChan received a termination event.
+func (h *handle) eventPoll(channel chan Event, timeoutMs int, maxEvents int, termChan chan bool) (Event, bool) {
+
+	var prevRkev *C.rd_kafka_event_t
+	term := false
+
+	var retval Event
+
+	if channel == nil {
+		maxEvents = 1
+	}
+out:
+	for evcnt := 0; evcnt < maxEvents; evcnt++ {
+		var evtype C.rd_kafka_event_type_t
+		var gMsg C.glue_msg_t
+		gMsg.want_hdrs = C.int8_t(bool2cint(h.msgFields.Headers))
+		rkev := C._rk_queue_poll(h.rkq, C.int(timeoutMs), &evtype, &gMsg, prevRkev)
+		prevRkev = rkev
+		timeoutMs = 0
+
+		retval = nil
+
+		switch evtype {
+		case C.RD_KAFKA_EVENT_FETCH:
+			// Consumer fetch event, new message.
+			// Extracted into temporary gMsg for optimization
+			retval = h.newMessageFromGlueMsg(&gMsg)
+
+		case C.RD_KAFKA_EVENT_REBALANCE:
+			// Consumer rebalance event
+			retval = h.c.handleRebalanceEvent(channel, rkev)
+
+		case C.RD_KAFKA_EVENT_ERROR:
+			// Error event
+			cErr := C.rd_kafka_event_error(rkev)
+			if cErr == C.RD_KAFKA_RESP_ERR__PARTITION_EOF {
+				crktpar := C.rd_kafka_event_topic_partition(rkev)
+				if crktpar == nil {
+					break
+				}
+
+				defer C.rd_kafka_topic_partition_destroy(crktpar)
+				var peof PartitionEOF
+				setupTopicPartitionFromCrktpar((*TopicPartition)(&peof), crktpar)
+
+				retval = peof
+
+			} else if int(C.rd_kafka_event_error_is_fatal(rkev)) != 0 {
+				// A fatal error has been raised.
+				// Extract the actual error from the client
+				// instance and return a new Error with
+				// fatal set to true.
+				cFatalErrstrSize := C.size_t(512)
+				cFatalErrstr := (*C.char)(C.malloc(cFatalErrstrSize))
+				defer C.free(unsafe.Pointer(cFatalErrstr))
+				cFatalErr := C.rd_kafka_fatal_error(h.rk, cFatalErrstr, cFatalErrstrSize)
+				fatalErr := newErrorFromCString(cFatalErr, cFatalErrstr)
+				fatalErr.fatal = true
+				retval = fatalErr
+
+			} else {
+				retval = newErrorFromCString(cErr, C.rd_kafka_event_error_string(rkev))
+			}
+
+		case C.RD_KAFKA_EVENT_STATS:
+			retval = &Stats{C.GoString(C.rd_kafka_event_stats(rkev))}
+
+		case C.RD_KAFKA_EVENT_DR:
+			// Producer Delivery Report event
+			// Each such event contains delivery reports for all
+			// messages in the produced batch.
+			// Forward delivery reports to per-message's response channel
+			// or to the global Producer.Events channel, or none.
+			rkmessages := make([]*C.rd_kafka_message_t, int(C.rd_kafka_event_message_count(rkev)))
+
+			cnt := int(C.rd_kafka_event_message_array(rkev, (**C.rd_kafka_message_t)(unsafe.Pointer(&rkmessages[0])), C.size_t(len(rkmessages))))
+
+			for _, rkmessage := range rkmessages[:cnt] {
+				msg := h.newMessageFromC(rkmessage)
+				var ch *chan Event
+
+				if rkmessage._private != nil {
+					// Find cgoif by id
+					cg, found := h.cgoGet((int)((uintptr)(rkmessage._private)))
+					if found {
+						cdr := cg.(cgoDr)
+
+						if cdr.deliveryChan != nil {
+							ch = &cdr.deliveryChan
+						}
+						msg.Opaque = cdr.opaque
+					}
+				}
+
+				if ch == nil && h.fwdDr {
+					ch = &channel
+				}
+
+				if ch != nil {
+					select {
+					case *ch <- msg:
+					case <-termChan:
+						retval = nil
+						term = true
+						break out
+					}
+
+				} else {
+					retval = msg
+					break out
+				}
+			}
+
+		case C.RD_KAFKA_EVENT_OFFSET_COMMIT:
+			// Offsets committed
+			cErr := C.rd_kafka_event_error(rkev)
+			coffsets := C.rd_kafka_event_topic_partition_list(rkev)
+			var offsets []TopicPartition
+			if coffsets != nil {
+				offsets = newTopicPartitionsFromCparts(coffsets)
+			}
+
+			if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+				retval = OffsetsCommitted{newErrorFromCString(cErr, C.rd_kafka_event_error_string(rkev)), offsets}
+			} else {
+				retval = OffsetsCommitted{nil, offsets}
+			}
+
+		case C.RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH:
+			ev := OAuthBearerTokenRefresh{C.GoString(C.rd_kafka_event_config_string(rkev))}
+			retval = ev
+
+		case C.RD_KAFKA_EVENT_NONE:
+			// poll timed out: no events available
+			break out
+
+		default:
+			if rkev != nil {
+				fmt.Fprintf(os.Stderr, "Ignored event %s\n",
+					C.GoString(C.rd_kafka_event_name(rkev)))
+			}
+
+		}
+
+		if retval != nil {
+			if channel != nil {
+				select {
+				case channel <- retval:
+				case <-termChan:
+					retval = nil
+					term = true
+					break out
+				}
+			} else {
+				break out
+			}
+		}
+	}
+
+	if prevRkev != nil {
+		C.rd_kafka_event_destroy(prevRkev)
+	}
+
+	return retval, term
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/generated_errors.go

@@ -0,0 +1,337 @@
+package kafka
+// Copyright 2016-2021 Confluent Inc.
+// AUTOMATICALLY GENERATED ON 2021-12-08 12:44:39.243338672 +0100 CET m=+0.000248284 USING librdkafka 1.8.2
+
+/*
+#include "select_rdkafka.h"
+*/
+import "C"
+
+// ErrorCode is the integer representation of local and broker error codes
+type ErrorCode int
+
+// String returns a human readable representation of an error code
+func (c ErrorCode) String() string {
+      return C.GoString(C.rd_kafka_err2str(C.rd_kafka_resp_err_t(c)))
+}
+
+const (
+    // ErrBadMsg Local: Bad message format
+    ErrBadMsg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__BAD_MSG)
+    // ErrBadCompression Local: Invalid compressed data
+    ErrBadCompression ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__BAD_COMPRESSION)
+    // ErrDestroy Local: Broker handle destroyed
+    ErrDestroy ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__DESTROY)
+    // ErrFail Local: Communication failure with broker
+    ErrFail ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FAIL)
+    // ErrTransport Local: Broker transport failure
+    ErrTransport ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TRANSPORT)
+    // ErrCritSysResource Local: Critical system resource failure
+    ErrCritSysResource ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE)
+    // ErrResolve Local: Host resolution failure
+    ErrResolve ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__RESOLVE)
+    // ErrMsgTimedOut Local: Message timed out
+    ErrMsgTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__MSG_TIMED_OUT)
+    // ErrPartitionEOF Broker: No more messages
+    ErrPartitionEOF ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PARTITION_EOF)
+    // ErrUnknownPartition Local: Unknown partition
+    ErrUnknownPartition ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_PARTITION)
+    // ErrFs Local: File or filesystem error
+    ErrFs ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FS)
+    // ErrUnknownTopic Local: Unknown topic
+    ErrUnknownTopic ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC)
+    // ErrAllBrokersDown Local: All broker connections are down
+    ErrAllBrokersDown ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ALL_BROKERS_DOWN)
+    // ErrInvalidArg Local: Invalid argument or configuration
+    ErrInvalidArg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INVALID_ARG)
+    // ErrTimedOut Local: Timed out
+    ErrTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TIMED_OUT)
+    // ErrQueueFull Local: Queue full
+    ErrQueueFull ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__QUEUE_FULL)
+    // ErrIsrInsuff Local: ISR count insufficient
+    ErrIsrInsuff ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ISR_INSUFF)
+    // ErrNodeUpdate Local: Broker node update
+    ErrNodeUpdate ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NODE_UPDATE)
+    // ErrSsl Local: SSL error
+    ErrSsl ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__SSL)
+    // ErrWaitCoord Local: Waiting for coordinator
+    ErrWaitCoord ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__WAIT_COORD)
+    // ErrUnknownGroup Local: Unknown group
+    ErrUnknownGroup ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_GROUP)
+    // ErrInProgress Local: Operation in progress
+    ErrInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__IN_PROGRESS)
+    // ErrPrevInProgress Local: Previous operation in progress
+    ErrPrevInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PREV_IN_PROGRESS)
+    // ErrExistingSubscription Local: Existing subscription
+    ErrExistingSubscription ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__EXISTING_SUBSCRIPTION)
+    // ErrAssignPartitions Local: Assign partitions
+    ErrAssignPartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ASSIGN_PARTITIONS)
+    // ErrRevokePartitions Local: Revoke partitions
+    ErrRevokePartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__REVOKE_PARTITIONS)
+    // ErrConflict Local: Conflicting use
+    ErrConflict ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__CONFLICT)
+    // ErrState Local: Erroneous state
+    ErrState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__STATE)
+    // ErrUnknownProtocol Local: Unknown protocol
+    ErrUnknownProtocol ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_PROTOCOL)
+    // ErrNotImplemented Local: Not implemented
+    ErrNotImplemented ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED)
+    // ErrAuthentication Local: Authentication failure
+    ErrAuthentication ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__AUTHENTICATION)
+    // ErrNoOffset Local: No offset stored
+    ErrNoOffset ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NO_OFFSET)
+    // ErrOutdated Local: Outdated
+    ErrOutdated ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__OUTDATED)
+    // ErrTimedOutQueue Local: Timed out in queue
+    ErrTimedOutQueue ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__TIMED_OUT_QUEUE)
+    // ErrUnsupportedFeature Local: Required feature not supported by broker
+    ErrUnsupportedFeature ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNSUPPORTED_FEATURE)
+    // ErrWaitCache Local: Awaiting cache update
+    ErrWaitCache ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__WAIT_CACHE)
+    // ErrIntr Local: Operation interrupted
+    ErrIntr ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INTR)
+    // ErrKeySerialization Local: Key serialization error
+    ErrKeySerialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__KEY_SERIALIZATION)
+    // ErrValueSerialization Local: Value serialization error
+    ErrValueSerialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__VALUE_SERIALIZATION)
+    // ErrKeyDeserialization Local: Key deserialization error
+    ErrKeyDeserialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__KEY_DESERIALIZATION)
+    // ErrValueDeserialization Local: Value deserialization error
+    ErrValueDeserialization ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__VALUE_DESERIALIZATION)
+    // ErrPartial Local: Partial response
+    ErrPartial ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PARTIAL)
+    // ErrReadOnly Local: Read-only object
+    ErrReadOnly ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__READ_ONLY)
+    // ErrNoent Local: No such entry
+    ErrNoent ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOENT)
+    // ErrUnderflow Local: Read underflow
+    ErrUnderflow ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNDERFLOW)
+    // ErrInvalidType Local: Invalid type
+    ErrInvalidType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INVALID_TYPE)
+    // ErrRetry Local: Retry operation
+    ErrRetry ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__RETRY)
+    // ErrPurgeQueue Local: Purged in queue
+    ErrPurgeQueue ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PURGE_QUEUE)
+    // ErrPurgeInflight Local: Purged in flight
+    ErrPurgeInflight ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__PURGE_INFLIGHT)
+    // ErrFatal Local: Fatal error
+    ErrFatal ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FATAL)
+    // ErrInconsistent Local: Inconsistent state
+    ErrInconsistent ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__INCONSISTENT)
+    // ErrGaplessGuarantee Local: Gap-less ordering would not be guaranteed if proceeding
+    ErrGaplessGuarantee ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__GAPLESS_GUARANTEE)
+    // ErrMaxPollExceeded Local: Maximum application poll interval (max.poll.interval.ms) exceeded
+    ErrMaxPollExceeded ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__MAX_POLL_EXCEEDED)
+    // ErrUnknownBroker Local: Unknown broker
+    ErrUnknownBroker ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__UNKNOWN_BROKER)
+    // ErrNotConfigured Local: Functionality not configured
+    ErrNotConfigured ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOT_CONFIGURED)
+    // ErrFenced Local: This instance has been fenced by a newer instance
+    ErrFenced ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__FENCED)
+    // ErrApplication Local: Application generated error
+    ErrApplication ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__APPLICATION)
+    // ErrAssignmentLost Local: Group partition assignment lost
+    ErrAssignmentLost ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__ASSIGNMENT_LOST)
+    // ErrNoop Local: No operation performed
+    ErrNoop ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__NOOP)
+    // ErrAutoOffsetReset Local: No offset to automatically reset to
+    ErrAutoOffsetReset ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR__AUTO_OFFSET_RESET)
+    // ErrUnknown Unknown broker error
+    ErrUnknown ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN)
+    // ErrNoError Success
+    ErrNoError ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NO_ERROR)
+    // ErrOffsetOutOfRange Broker: Offset out of range
+    ErrOffsetOutOfRange ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OFFSET_OUT_OF_RANGE)
+    // ErrInvalidMsg Broker: Invalid message
+    ErrInvalidMsg ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_MSG)
+    // ErrUnknownTopicOrPart Broker: Unknown topic or partition
+    ErrUnknownTopicOrPart ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_TOPIC_OR_PART)
+    // ErrInvalidMsgSize Broker: Invalid message size
+    ErrInvalidMsgSize ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_MSG_SIZE)
+    // ErrLeaderNotAvailable Broker: Leader not available
+    ErrLeaderNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LEADER_NOT_AVAILABLE)
+    // ErrNotLeaderForPartition Broker: Not leader for partition
+    ErrNotLeaderForPartition ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_LEADER_FOR_PARTITION)
+    // ErrRequestTimedOut Broker: Request timed out
+    ErrRequestTimedOut ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REQUEST_TIMED_OUT)
+    // ErrBrokerNotAvailable Broker: Broker not available
+    ErrBrokerNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_BROKER_NOT_AVAILABLE)
+    // ErrReplicaNotAvailable Broker: Replica not available
+    ErrReplicaNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REPLICA_NOT_AVAILABLE)
+    // ErrMsgSizeTooLarge Broker: Message size too large
+    ErrMsgSizeTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_MSG_SIZE_TOO_LARGE)
+    // ErrStaleCtrlEpoch Broker: StaleControllerEpochCode
+    ErrStaleCtrlEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_STALE_CTRL_EPOCH)
+    // ErrOffsetMetadataTooLarge Broker: Offset metadata string too large
+    ErrOffsetMetadataTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OFFSET_METADATA_TOO_LARGE)
+    // ErrNetworkException Broker: Broker disconnected before response received
+    ErrNetworkException ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NETWORK_EXCEPTION)
+    // ErrCoordinatorLoadInProgress Broker: Coordinator load in progress
+    ErrCoordinatorLoadInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_COORDINATOR_LOAD_IN_PROGRESS)
+    // ErrCoordinatorNotAvailable Broker: Coordinator not available
+    ErrCoordinatorNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_COORDINATOR_NOT_AVAILABLE)
+    // ErrNotCoordinator Broker: Not coordinator
+    ErrNotCoordinator ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_COORDINATOR)
+    // ErrTopicException Broker: Invalid topic
+    ErrTopicException ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_EXCEPTION)
+    // ErrRecordListTooLarge Broker: Message batch larger than configured server segment size
+    ErrRecordListTooLarge ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_RECORD_LIST_TOO_LARGE)
+    // ErrNotEnoughReplicas Broker: Not enough in-sync replicas
+    ErrNotEnoughReplicas ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS)
+    // ErrNotEnoughReplicasAfterAppend Broker: Message(s) written to insufficient number of in-sync replicas
+    ErrNotEnoughReplicasAfterAppend ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_ENOUGH_REPLICAS_AFTER_APPEND)
+    // ErrInvalidRequiredAcks Broker: Invalid required acks value
+    ErrInvalidRequiredAcks ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REQUIRED_ACKS)
+    // ErrIllegalGeneration Broker: Specified group generation id is not valid
+    ErrIllegalGeneration ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ILLEGAL_GENERATION)
+    // ErrInconsistentGroupProtocol Broker: Inconsistent group protocol
+    ErrInconsistentGroupProtocol ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INCONSISTENT_GROUP_PROTOCOL)
+    // ErrInvalidGroupID Broker: Invalid group.id
+    ErrInvalidGroupID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_GROUP_ID)
+    // ErrUnknownMemberID Broker: Unknown member
+    ErrUnknownMemberID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_MEMBER_ID)
+    // ErrInvalidSessionTimeout Broker: Invalid session timeout
+    ErrInvalidSessionTimeout ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_SESSION_TIMEOUT)
+    // ErrRebalanceInProgress Broker: Group rebalance in progress
+    ErrRebalanceInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REBALANCE_IN_PROGRESS)
+    // ErrInvalidCommitOffsetSize Broker: Commit offset data size is not valid
+    ErrInvalidCommitOffsetSize ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_COMMIT_OFFSET_SIZE)
+    // ErrTopicAuthorizationFailed Broker: Topic authorization failed
+    ErrTopicAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_AUTHORIZATION_FAILED)
+    // ErrGroupAuthorizationFailed Broker: Group authorization failed
+    ErrGroupAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_AUTHORIZATION_FAILED)
+    // ErrClusterAuthorizationFailed Broker: Cluster authorization failed
+    ErrClusterAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_CLUSTER_AUTHORIZATION_FAILED)
+    // ErrInvalidTimestamp Broker: Invalid timestamp
+    ErrInvalidTimestamp ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TIMESTAMP)
+    // ErrUnsupportedSaslMechanism Broker: Unsupported SASL mechanism
+    ErrUnsupportedSaslMechanism ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_SASL_MECHANISM)
+    // ErrIllegalSaslState Broker: Request not valid in current SASL state
+    ErrIllegalSaslState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ILLEGAL_SASL_STATE)
+    // ErrUnsupportedVersion Broker: API version not supported
+    ErrUnsupportedVersion ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_VERSION)
+    // ErrTopicAlreadyExists Broker: Topic already exists
+    ErrTopicAlreadyExists ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_ALREADY_EXISTS)
+    // ErrInvalidPartitions Broker: Invalid number of partitions
+    ErrInvalidPartitions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PARTITIONS)
+    // ErrInvalidReplicationFactor Broker: Invalid replication factor
+    ErrInvalidReplicationFactor ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REPLICATION_FACTOR)
+    // ErrInvalidReplicaAssignment Broker: Invalid replica assignment
+    ErrInvalidReplicaAssignment ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REPLICA_ASSIGNMENT)
+    // ErrInvalidConfig Broker: Configuration is invalid
+    ErrInvalidConfig ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_CONFIG)
+    // ErrNotController Broker: Not controller for cluster
+    ErrNotController ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NOT_CONTROLLER)
+    // ErrInvalidRequest Broker: Invalid request
+    ErrInvalidRequest ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_REQUEST)
+    // ErrUnsupportedForMessageFormat Broker: Message format on broker does not support request
+    ErrUnsupportedForMessageFormat ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_FOR_MESSAGE_FORMAT)
+    // ErrPolicyViolation Broker: Policy violation
+    ErrPolicyViolation ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_POLICY_VIOLATION)
+    // ErrOutOfOrderSequenceNumber Broker: Broker received an out of order sequence number
+    ErrOutOfOrderSequenceNumber ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OUT_OF_ORDER_SEQUENCE_NUMBER)
+    // ErrDuplicateSequenceNumber Broker: Broker received a duplicate sequence number
+    ErrDuplicateSequenceNumber ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DUPLICATE_SEQUENCE_NUMBER)
+    // ErrInvalidProducerEpoch Broker: Producer attempted an operation with an old epoch
+    ErrInvalidProducerEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRODUCER_EPOCH)
+    // ErrInvalidTxnState Broker: Producer attempted a transactional operation in an invalid state
+    ErrInvalidTxnState ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TXN_STATE)
+    // ErrInvalidProducerIDMapping Broker: Producer attempted to use a producer id which is not currently assigned to its transactional id
+    ErrInvalidProducerIDMapping ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRODUCER_ID_MAPPING)
+    // ErrInvalidTransactionTimeout Broker: Transaction timeout is larger than the maximum value allowed by the broker's max.transaction.timeout.ms
+    ErrInvalidTransactionTimeout ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_TRANSACTION_TIMEOUT)
+    // ErrConcurrentTransactions Broker: Producer attempted to update a transaction while another concurrent operation on the same transaction was ongoing
+    ErrConcurrentTransactions ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_CONCURRENT_TRANSACTIONS)
+    // ErrTransactionCoordinatorFenced Broker: Indicates that the transaction coordinator sending a WriteTxnMarker is no longer the current coordinator for a given producer
+    ErrTransactionCoordinatorFenced ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TRANSACTION_COORDINATOR_FENCED)
+    // ErrTransactionalIDAuthorizationFailed Broker: Transactional Id authorization failed
+    ErrTransactionalIDAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TRANSACTIONAL_ID_AUTHORIZATION_FAILED)
+    // ErrSecurityDisabled Broker: Security features are disabled
+    ErrSecurityDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_SECURITY_DISABLED)
+    // ErrOperationNotAttempted Broker: Operation not attempted
+    ErrOperationNotAttempted ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OPERATION_NOT_ATTEMPTED)
+    // ErrKafkaStorageError Broker: Disk error when trying to access log file on disk
+    ErrKafkaStorageError ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_KAFKA_STORAGE_ERROR)
+    // ErrLogDirNotFound Broker: The user-specified log directory is not found in the broker config
+    ErrLogDirNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LOG_DIR_NOT_FOUND)
+    // ErrSaslAuthenticationFailed Broker: SASL Authentication failed
+    ErrSaslAuthenticationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_SASL_AUTHENTICATION_FAILED)
+    // ErrUnknownProducerID Broker: Unknown Producer Id
+    ErrUnknownProducerID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_PRODUCER_ID)
+    // ErrReassignmentInProgress Broker: Partition reassignment is in progress
+    ErrReassignmentInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_REASSIGNMENT_IN_PROGRESS)
+    // ErrDelegationTokenAuthDisabled Broker: Delegation Token feature is not enabled
+    ErrDelegationTokenAuthDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTH_DISABLED)
+    // ErrDelegationTokenNotFound Broker: Delegation Token is not found on server
+    ErrDelegationTokenNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_NOT_FOUND)
+    // ErrDelegationTokenOwnerMismatch Broker: Specified Principal is not valid Owner/Renewer
+    ErrDelegationTokenOwnerMismatch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_OWNER_MISMATCH)
+    // ErrDelegationTokenRequestNotAllowed Broker: Delegation Token requests are not allowed on this connection
+    ErrDelegationTokenRequestNotAllowed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_REQUEST_NOT_ALLOWED)
+    // ErrDelegationTokenAuthorizationFailed Broker: Delegation Token authorization failed
+    ErrDelegationTokenAuthorizationFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_AUTHORIZATION_FAILED)
+    // ErrDelegationTokenExpired Broker: Delegation Token is expired
+    ErrDelegationTokenExpired ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DELEGATION_TOKEN_EXPIRED)
+    // ErrInvalidPrincipalType Broker: Supplied principalType is not supported
+    ErrInvalidPrincipalType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_PRINCIPAL_TYPE)
+    // ErrNonEmptyGroup Broker: The group is not empty
+    ErrNonEmptyGroup ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NON_EMPTY_GROUP)
+    // ErrGroupIDNotFound Broker: The group id does not exist
+    ErrGroupIDNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_ID_NOT_FOUND)
+    // ErrFetchSessionIDNotFound Broker: The fetch session ID was not found
+    ErrFetchSessionIDNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_FETCH_SESSION_ID_NOT_FOUND)
+    // ErrInvalidFetchSessionEpoch Broker: The fetch session epoch is invalid
+    ErrInvalidFetchSessionEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_FETCH_SESSION_EPOCH)
+    // ErrListenerNotFound Broker: No matching listener
+    ErrListenerNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_LISTENER_NOT_FOUND)
+    // ErrTopicDeletionDisabled Broker: Topic deletion is disabled
+    ErrTopicDeletionDisabled ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_TOPIC_DELETION_DISABLED)
+    // ErrFencedLeaderEpoch Broker: Leader epoch is older than broker epoch
+    ErrFencedLeaderEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_FENCED_LEADER_EPOCH)
+    // ErrUnknownLeaderEpoch Broker: Leader epoch is newer than broker epoch
+    ErrUnknownLeaderEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNKNOWN_LEADER_EPOCH)
+    // ErrUnsupportedCompressionType Broker: Unsupported compression type
+    ErrUnsupportedCompressionType ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSUPPORTED_COMPRESSION_TYPE)
+    // ErrStaleBrokerEpoch Broker: Broker epoch has changed
+    ErrStaleBrokerEpoch ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_STALE_BROKER_EPOCH)
+    // ErrOffsetNotAvailable Broker: Leader high watermark is not caught up
+    ErrOffsetNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_OFFSET_NOT_AVAILABLE)
+    // ErrMemberIDRequired Broker: Group member needs a valid member ID
+    ErrMemberIDRequired ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_MEMBER_ID_REQUIRED)
+    // ErrPreferredLeaderNotAvailable Broker: Preferred leader was not available
+    ErrPreferredLeaderNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_PREFERRED_LEADER_NOT_AVAILABLE)
+    // ErrGroupMaxSizeReached Broker: Consumer group has reached maximum size
+    ErrGroupMaxSizeReached ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_MAX_SIZE_REACHED)
+    // ErrFencedInstanceID Broker: Static consumer fenced by other consumer with same group.instance.id
+    ErrFencedInstanceID ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_FENCED_INSTANCE_ID)
+    // ErrEligibleLeadersNotAvailable Broker: Eligible partition leaders are not available
+    ErrEligibleLeadersNotAvailable ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ELIGIBLE_LEADERS_NOT_AVAILABLE)
+    // ErrElectionNotNeeded Broker: Leader election not needed for topic partition
+    ErrElectionNotNeeded ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_ELECTION_NOT_NEEDED)
+    // ErrNoReassignmentInProgress Broker: No partition reassignment is in progress
+    ErrNoReassignmentInProgress ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_NO_REASSIGNMENT_IN_PROGRESS)
+    // ErrGroupSubscribedToTopic Broker: Deleting offsets of a topic while the consumer group is subscribed to it
+    ErrGroupSubscribedToTopic ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_GROUP_SUBSCRIBED_TO_TOPIC)
+    // ErrInvalidRecord Broker: Broker failed to validate record
+    ErrInvalidRecord ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_RECORD)
+    // ErrUnstableOffsetCommit Broker: There are unstable offsets that need to be cleared
+    ErrUnstableOffsetCommit ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNSTABLE_OFFSET_COMMIT)
+    // ErrThrottlingQuotaExceeded Broker: Throttling quota has been exceeded
+    ErrThrottlingQuotaExceeded ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_THROTTLING_QUOTA_EXCEEDED)
+    // ErrProducerFenced Broker: There is a newer producer with the same transactionalId which fences the current one
+    ErrProducerFenced ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_PRODUCER_FENCED)
+    // ErrResourceNotFound Broker: Request illegally referred to resource that does not exist
+    ErrResourceNotFound ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_RESOURCE_NOT_FOUND)
+    // ErrDuplicateResource Broker: Request illegally referred to the same resource twice
+    ErrDuplicateResource ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_DUPLICATE_RESOURCE)
+    // ErrUnacceptableCredential Broker: Requested credential would not meet criteria for acceptability
+    ErrUnacceptableCredential ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_UNACCEPTABLE_CREDENTIAL)
+    // ErrInconsistentVoterSet Broker: Indicates that the either the sender or recipient of a voter-only request is not one of the expected voters
+    ErrInconsistentVoterSet ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INCONSISTENT_VOTER_SET)
+    // ErrInvalidUpdateVersion Broker: Invalid update version
+    ErrInvalidUpdateVersion ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_INVALID_UPDATE_VERSION)
+    // ErrFeatureUpdateFailed Broker: Unable to update finalized features due to server error
+    ErrFeatureUpdateFailed ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_FEATURE_UPDATE_FAILED)
+    // ErrPrincipalDeserializationFailure Broker: Request principal deserialization failed during forwarding
+    ErrPrincipalDeserializationFailure ErrorCode = ErrorCode(C.RD_KAFKA_RESP_ERR_PRINCIPAL_DESERIALIZATION_FAILURE)
+)

vendor/github.com/confluentinc/confluent-kafka-go/kafka/glue_rdkafka.h

@@ -0,0 +1,48 @@
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+
+/**
+ * Glue between Go, Cgo and librdkafka
+ */
+
+
+/**
+ * Temporary C to Go header representation
+ */
+typedef struct tmphdr_s {
+  const char *key;
+  const void *val;   // producer: malloc()ed by Go code if size > 0
+                     // consumer: owned by librdkafka
+  ssize_t     size;
+} tmphdr_t;
+
+
+
+/**
+ * @struct This is a glue struct used by the C code in this client to
+ *         effectively map fields from a librdkafka rd_kafka_message_t
+ *         to something usable in Go with as few CGo calls as possible.
+ */
+typedef struct glue_msg_s {
+  rd_kafka_message_t *msg;
+  rd_kafka_timestamp_type_t tstype;
+  int64_t   ts;
+  tmphdr_t *tmphdrs;
+  size_t    tmphdrsCnt;
+  int8_t    want_hdrs;  /**< If true, copy headers */
+} glue_msg_t;

vendor/github.com/confluentinc/confluent-kafka-go/kafka/handle.go

@@ -0,0 +1,379 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+	"unsafe"
+)
+
+/*
+#include "select_rdkafka.h"
+#include <stdlib.h>
+*/
+import "C"
+
+// OAuthBearerToken represents the data to be transmitted
+// to a broker during SASL/OAUTHBEARER authentication.
+type OAuthBearerToken struct {
+	// Token value, often (but not necessarily) a JWS compact serialization
+	// as per https://tools.ietf.org/html/rfc7515#section-3.1; it must meet
+	// the regular expression for a SASL/OAUTHBEARER value defined at
+	// https://tools.ietf.org/html/rfc7628#section-3.1
+	TokenValue string
+	// Metadata about the token indicating when it expires (local time);
+	// it must represent a time in the future
+	Expiration time.Time
+	// Metadata about the token indicating the Kafka principal name
+	// to which it applies (for example, "admin")
+	Principal string
+	// SASL extensions, if any, to be communicated to the broker during
+	// authentication (all keys and values of which must meet the regular
+	// expressions defined at https://tools.ietf.org/html/rfc7628#section-3.1,
+	// and it must not contain the reserved "auth" key)
+	Extensions map[string]string
+}
+
+// Handle represents a generic client handle containing common parts for
+// both Producer and Consumer.
+type Handle interface {
+	// SetOAuthBearerToken sets the the data to be transmitted
+	// to a broker during SASL/OAUTHBEARER authentication. It will return nil
+	// on success, otherwise an error if:
+	// 1) the token data is invalid (meaning an expiration time in the past
+	// or either a token value or an extension key or value that does not meet
+	// the regular expression requirements as per
+	// https://tools.ietf.org/html/rfc7628#section-3.1);
+	// 2) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+	// 3) SASL/OAUTHBEARER is supported but is not configured as the client's
+	// authentication mechanism.
+	SetOAuthBearerToken(oauthBearerToken OAuthBearerToken) error
+
+	// SetOAuthBearerTokenFailure sets the error message describing why token
+	// retrieval/setting failed; it also schedules a new token refresh event for 10
+	// seconds later so the attempt may be retried. It will return nil on
+	// success, otherwise an error if:
+	// 1) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+	// 2) SASL/OAUTHBEARER is supported but is not configured as the client's
+	// authentication mechanism.
+	SetOAuthBearerTokenFailure(errstr string) error
+
+	// gethandle() returns the internal handle struct pointer
+	gethandle() *handle
+}
+
+// Common instance handle for both Producer and Consumer
+type handle struct {
+	rk  *C.rd_kafka_t
+	rkq *C.rd_kafka_queue_t
+
+	// Forward logs from librdkafka log queue to logs channel.
+	logs          chan LogEvent
+	logq          *C.rd_kafka_queue_t
+	closeLogsChan bool
+
+	// Topic <-> rkt caches
+	rktCacheLock sync.Mutex
+	// topic name -> rkt cache
+	rktCache map[string]*C.rd_kafka_topic_t
+	// rkt -> topic name cache
+	rktNameCache map[*C.rd_kafka_topic_t]string
+
+	// Cached instance name to avoid CGo call in String()
+	name string
+
+	//
+	// cgo map
+	// Maps C callbacks based on cgoid back to its Go object
+	cgoLock   sync.Mutex
+	cgoidNext uintptr
+	cgomap    map[int]cgoif
+
+	//
+	// producer
+	//
+	p *Producer
+
+	// Forward delivery reports on Producer.Events channel
+	fwdDr bool
+
+	// Enabled message fields for delivery reports and consumed messages.
+	msgFields *messageFields
+
+	//
+	// consumer
+	//
+	c *Consumer
+
+	// WaitGroup to wait for spawned go-routines to finish.
+	waitGroup sync.WaitGroup
+}
+
+func (h *handle) String() string {
+	return h.name
+}
+
+func (h *handle) setup() {
+	h.rktCache = make(map[string]*C.rd_kafka_topic_t)
+	h.rktNameCache = make(map[*C.rd_kafka_topic_t]string)
+	h.cgomap = make(map[int]cgoif)
+	h.name = C.GoString(C.rd_kafka_name(h.rk))
+	if h.msgFields == nil {
+		h.msgFields = newMessageFields()
+	}
+}
+
+func (h *handle) cleanup() {
+	if h.logs != nil {
+		C.rd_kafka_queue_destroy(h.logq)
+		if h.closeLogsChan {
+			close(h.logs)
+		}
+	}
+
+	for _, crkt := range h.rktCache {
+		C.rd_kafka_topic_destroy(crkt)
+	}
+
+	if h.rkq != nil {
+		C.rd_kafka_queue_destroy(h.rkq)
+	}
+}
+
+func (h *handle) setupLogQueue(logsChan chan LogEvent, termChan chan bool) {
+	if logsChan == nil {
+		logsChan = make(chan LogEvent, 10000)
+		h.closeLogsChan = true
+	}
+
+	h.logs = logsChan
+
+	// Let librdkafka forward logs to our log queue instead of the main queue
+	h.logq = C.rd_kafka_queue_new(h.rk)
+	C.rd_kafka_set_log_queue(h.rk, h.logq)
+
+	// Start a polling goroutine to consume the log queue
+	h.waitGroup.Add(1)
+	go func() {
+		h.pollLogEvents(h.logs, 100, termChan)
+		h.waitGroup.Done()
+	}()
+
+}
+
+// getRkt0 finds or creates and returns a C topic_t object from the local cache.
+func (h *handle) getRkt0(topic string, ctopic *C.char, doLock bool) (crkt *C.rd_kafka_topic_t) {
+	if doLock {
+		h.rktCacheLock.Lock()
+		defer h.rktCacheLock.Unlock()
+	}
+	crkt, ok := h.rktCache[topic]
+	if ok {
+		return crkt
+	}
+
+	if ctopic == nil {
+		ctopic = C.CString(topic)
+		defer C.free(unsafe.Pointer(ctopic))
+	}
+
+	crkt = C.rd_kafka_topic_new(h.rk, ctopic, nil)
+	if crkt == nil {
+		panic(fmt.Sprintf("Unable to create new C topic \"%s\": %s",
+			topic, C.GoString(C.rd_kafka_err2str(C.rd_kafka_last_error()))))
+	}
+
+	h.rktCache[topic] = crkt
+	h.rktNameCache[crkt] = topic
+
+	return crkt
+}
+
+// getRkt finds or creates and returns a C topic_t object from the local cache.
+func (h *handle) getRkt(topic string) (crkt *C.rd_kafka_topic_t) {
+	return h.getRkt0(topic, nil, true)
+}
+
+// getTopicNameFromRkt returns the topic name for a C topic_t object, preferably
+// using the local cache to avoid a cgo call.
+func (h *handle) getTopicNameFromRkt(crkt *C.rd_kafka_topic_t) (topic string) {
+	h.rktCacheLock.Lock()
+	defer h.rktCacheLock.Unlock()
+
+	topic, ok := h.rktNameCache[crkt]
+	if ok {
+		return topic
+	}
+
+	// we need our own copy/refcount of the crkt
+	ctopic := C.rd_kafka_topic_name(crkt)
+	topic = C.GoString(ctopic)
+
+	crkt = h.getRkt0(topic, ctopic, false /* dont lock */)
+
+	return topic
+}
+
+// cgoif is a generic interface for holding Go state passed as opaque
+// value to the C code.
+// Since pointers to complex Go types cannot be passed to C we instead create
+// a cgoif object, generate a unique id that is added to the cgomap,
+// and then pass that id to the C code. When the C code callback is called we
+// use the id to look up the cgoif object in the cgomap.
+type cgoif interface{}
+
+// delivery report cgoif container
+type cgoDr struct {
+	deliveryChan chan Event
+	opaque       interface{}
+}
+
+// cgoPut adds object cg to the handle's cgo map and returns a
+// unique id for the added entry.
+// Thread-safe.
+// FIXME: the uniquity of the id is questionable over time.
+func (h *handle) cgoPut(cg cgoif) (cgoid int) {
+	h.cgoLock.Lock()
+	defer h.cgoLock.Unlock()
+
+	h.cgoidNext++
+	if h.cgoidNext == 0 {
+		h.cgoidNext++
+	}
+	cgoid = (int)(h.cgoidNext)
+	h.cgomap[cgoid] = cg
+	return cgoid
+}
+
+// cgoGet looks up cgoid in the cgo map, deletes the reference from the map
+// and returns the object, if found. Else returns nil, false.
+// Thread-safe.
+func (h *handle) cgoGet(cgoid int) (cg cgoif, found bool) {
+	if cgoid == 0 {
+		return nil, false
+	}
+
+	h.cgoLock.Lock()
+	defer h.cgoLock.Unlock()
+	cg, found = h.cgomap[cgoid]
+	if found {
+		delete(h.cgomap, cgoid)
+	}
+
+	return cg, found
+}
+
+// setOauthBearerToken - see rd_kafka_oauthbearer_set_token()
+func (h *handle) setOAuthBearerToken(oauthBearerToken OAuthBearerToken) error {
+	cTokenValue := C.CString(oauthBearerToken.TokenValue)
+	defer C.free(unsafe.Pointer(cTokenValue))
+
+	cPrincipal := C.CString(oauthBearerToken.Principal)
+	defer C.free(unsafe.Pointer(cPrincipal))
+
+	cErrstrSize := C.size_t(512)
+	cErrstr := (*C.char)(C.malloc(cErrstrSize))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	cExtensions := make([]*C.char, 2*len(oauthBearerToken.Extensions))
+	extensionSize := 0
+	for key, value := range oauthBearerToken.Extensions {
+		cExtensions[extensionSize] = C.CString(key)
+		defer C.free(unsafe.Pointer(cExtensions[extensionSize]))
+		extensionSize++
+		cExtensions[extensionSize] = C.CString(value)
+		defer C.free(unsafe.Pointer(cExtensions[extensionSize]))
+		extensionSize++
+	}
+
+	var cExtensionsToUse **C.char
+	if extensionSize > 0 {
+		cExtensionsToUse = (**C.char)(unsafe.Pointer(&cExtensions[0]))
+	}
+
+	cErr := C.rd_kafka_oauthbearer_set_token(h.rk, cTokenValue,
+		C.int64_t(oauthBearerToken.Expiration.UnixNano()/(1000*1000)), cPrincipal,
+		cExtensionsToUse, C.size_t(extensionSize), cErrstr, cErrstrSize)
+	if cErr == C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil
+	}
+	return newErrorFromCString(cErr, cErrstr)
+}
+
+// setOauthBearerTokenFailure - see rd_kafka_oauthbearer_set_token_failure()
+func (h *handle) setOAuthBearerTokenFailure(errstr string) error {
+	cerrstr := C.CString(errstr)
+	defer C.free(unsafe.Pointer(cerrstr))
+	cErr := C.rd_kafka_oauthbearer_set_token_failure(h.rk, cerrstr)
+	if cErr == C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil
+	}
+	return newError(cErr)
+}
+
+// messageFields controls which fields are made available for producer delivery reports & consumed messages.
+// true values indicate that the field should be included
+type messageFields struct {
+	Key     bool
+	Value   bool
+	Headers bool
+}
+
+// disableAll disable all fields
+func (mf *messageFields) disableAll() {
+	mf.Key = false
+	mf.Value = false
+	mf.Headers = false
+}
+
+// newMessageFields returns a new messageFields with all fields enabled
+func newMessageFields() *messageFields {
+	return &messageFields{
+		Key:     true,
+		Value:   true,
+		Headers: true,
+	}
+}
+
+// newMessageFieldsFrom constructs a new messageFields from the given configuration value
+func newMessageFieldsFrom(v ConfigValue) (*messageFields, error) {
+	msgFields := newMessageFields()
+	switch v {
+	case "all":
+		// nothing to do
+	case "", "none":
+		msgFields.disableAll()
+	default:
+		msgFields.disableAll()
+		for _, value := range strings.Split(v.(string), ",") {
+			switch value {
+			case "key":
+				msgFields.Key = true
+			case "value":
+				msgFields.Value = true
+			case "headers":
+				msgFields.Headers = true
+			default:
+				return nil, fmt.Errorf("unknown message field: %s", value)
+			}
+		}
+	}
+	return msgFields, nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/header.go

@@ -0,0 +1,67 @@
+package kafka
+
+/**
+ * Copyright 2018 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"strconv"
+)
+
+/*
+#include <string.h>
+#include "select_rdkafka.h"
+#include "glue_rdkafka.h"
+*/
+import "C"
+
+// Header represents a single Kafka message header.
+//
+// Message headers are made up of a list of Header elements, retaining their original insert
+// order and allowing for duplicate Keys.
+//
+// Key is a human readable string identifying the header.
+// Value is the key's binary value, Kafka does not put any restrictions on the format of
+// of the Value but it should be made relatively compact.
+// The value may be a byte array, empty, or nil.
+//
+// NOTE: Message headers are not available on producer delivery report messages.
+type Header struct {
+	Key   string // Header name (utf-8 string)
+	Value []byte // Header value (nil, empty, or binary)
+}
+
+// String returns the Header Key and data in a human representable possibly truncated form
+// suitable for displaying to the user.
+func (h Header) String() string {
+	if h.Value == nil {
+		return fmt.Sprintf("%s=nil", h.Key)
+	}
+
+	valueLen := len(h.Value)
+	if valueLen == 0 {
+		return fmt.Sprintf("%s=<empty>", h.Key)
+	}
+
+	truncSize := valueLen
+	trunc := ""
+	if valueLen > 50+15 {
+		truncSize = 50
+		trunc = fmt.Sprintf("(%d more bytes)", valueLen-truncSize)
+	}
+
+	return fmt.Sprintf("%s=%s%s", h.Key, strconv.Quote(string(h.Value[:truncSize])), trunc)
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/kafka.go

@@ -0,0 +1,375 @@
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Package kafka provides high-level Apache Kafka producer and consumers
+// using bindings on-top of the librdkafka C library.
+//
+//
+// High-level Consumer
+//
+// * Decide if you want to read messages and events by calling `.Poll()` or 
+// the deprecated option of using the `.Events()` channel. (If you want to use
+// `.Events()` channel then set `"go.events.channel.enable": true`).
+//
+// * Create a Consumer with `kafka.NewConsumer()` providing at
+// least the `bootstrap.servers` and `group.id` configuration properties.
+//
+// * Call `.Subscribe()` or (`.SubscribeTopics()` to subscribe to multiple topics)
+// to join the group with the specified subscription set.
+// Subscriptions are atomic, calling `.Subscribe*()` again will leave
+// the group and rejoin with the new set of topics.
+//
+// * Start reading events and messages from either the `.Events` channel
+// or by calling `.Poll()`.
+//
+// * When the group has rebalanced each client member is assigned a
+// (sub-)set of topic+partitions.
+// By default the consumer will start fetching messages for its assigned
+// partitions at this point, but your application may enable rebalance
+// events to get an insight into what the assigned partitions where
+// as well as set the initial offsets. To do this you need to pass
+// `"go.application.rebalance.enable": true` to the `NewConsumer()` call
+// mentioned above. You will (eventually) see a `kafka.AssignedPartitions` event
+// with the assigned partition set. You can optionally modify the initial
+// offsets (they'll default to stored offsets and if there are no previously stored
+// offsets it will fall back to `"auto.offset.reset"`
+// which defaults to the `latest` message) and then call `.Assign(partitions)`
+// to start consuming. If you don't need to modify the initial offsets you will
+// not need to call `.Assign()`, the client will do so automatically for you if
+// you dont, unless you are using the channel-based consumer in which case
+// you MUST call `.Assign()` when receiving the `AssignedPartitions` and
+// `RevokedPartitions` events.
+//
+// * As messages are fetched they will be made available on either the
+// `.Events` channel or by calling `.Poll()`, look for event type `*kafka.Message`.
+//
+// * Handle messages, events and errors to your liking.
+//
+// * When you are done consuming call `.Close()` to commit final offsets
+// and leave the consumer group.
+//
+//
+//
+// Producer
+//
+// * Create a Producer with `kafka.NewProducer()` providing at least
+// the `bootstrap.servers` configuration properties.
+//
+// * Messages may now be produced either by sending a `*kafka.Message`
+// on the `.ProduceChannel` or by calling `.Produce()`.
+//
+// * Producing is an asynchronous operation so the client notifies the application
+// of per-message produce success or failure through something called delivery reports.
+// Delivery reports are by default emitted on the `.Events()` channel as `*kafka.Message`
+// and you should check `msg.TopicPartition.Error` for `nil` to find out if the message
+// was succesfully delivered or not.
+// It is also possible to direct delivery reports to alternate channels
+// by providing a non-nil `chan Event` channel to `.Produce()`.
+// If no delivery reports are wanted they can be completely disabled by
+// setting configuration property `"go.delivery.reports": false`.
+//
+// * When you are done producing messages you will need to make sure all messages
+// are indeed delivered to the broker (or failed), remember that this is
+// an asynchronous client so some of your messages may be lingering in internal
+// channels or tranmission queues.
+// To do this you can either keep track of the messages you've produced
+// and wait for their corresponding delivery reports, or call the convenience
+// function `.Flush()` that will block until all message deliveries are done
+// or the provided timeout elapses.
+//
+// * Finally call `.Close()` to decommission the producer.
+//
+//
+// Transactional producer API
+//
+// The transactional producer operates on top of the idempotent producer,
+// and provides full exactly-once semantics (EOS) for Apache Kafka when used
+// with the transaction aware consumer (`isolation.level=read_committed`).
+//
+// A producer instance is configured for transactions by setting the
+// `transactional.id` to an identifier unique for the application. This
+// id will be used to fence stale transactions from previous instances of
+// the application, typically following an outage or crash.
+//
+// After creating the transactional producer instance using `NewProducer()`
+// the transactional state must be initialized by calling
+// `InitTransactions()`. This is a blocking call that will
+// acquire a runtime producer id from the transaction coordinator broker
+// as well as abort any stale transactions and fence any still running producer
+// instances with the same `transactional.id`.
+//
+// Once transactions are initialized the application may begin a new
+// transaction by calling `BeginTransaction()`.
+// A producer instance may only have one single on-going transaction.
+//
+// Any messages produced after the transaction has been started will
+// belong to the ongoing transaction and will be committed or aborted
+// atomically.
+// It is not permitted to produce messages outside a transaction
+// boundary, e.g., before `BeginTransaction()` or after `CommitTransaction()`,
+// `AbortTransaction()` or if the current transaction has failed.
+//
+// If consumed messages are used as input to the transaction, the consumer
+// instance must be configured with `enable.auto.commit` set to `false`.
+// To commit the consumed offsets along with the transaction pass the
+// list of consumed partitions and the last offset processed + 1 to
+// `SendOffsetsToTransaction()` prior to committing the transaction.
+// This allows an aborted transaction to be restarted using the previously
+// committed offsets.
+//
+// To commit the produced messages, and any consumed offsets, to the
+// current transaction, call `CommitTransaction()`.
+// This call will block until the transaction has been fully committed or
+// failed (typically due to fencing by a newer producer instance).
+//
+// Alternatively, if processing fails, or an abortable transaction error is
+// raised, the transaction needs to be aborted by calling
+// `AbortTransaction()` which marks any produced messages and
+// offset commits as aborted.
+//
+// After the current transaction has been committed or aborted a new
+// transaction may be started by calling `BeginTransaction()` again.
+//
+// Retriable errors:
+// Some error cases allow the attempted operation to be retried, this is
+// indicated by the error object having the retriable flag set which can
+// be detected by calling `err.(kafka.Error).IsRetriable()`.
+// When this flag is set the application may retry the operation immediately
+// or preferably after a shorter grace period (to avoid busy-looping).
+// Retriable errors include timeouts, broker transport failures, etc.
+//
+// Abortable errors:
+// An ongoing transaction may fail permanently due to various errors,
+// such as transaction coordinator becoming unavailable, write failures to the
+// Apache Kafka log, under-replicated partitions, etc.
+// At this point the producer application must abort the current transaction
+// using `AbortTransaction()` and optionally start a new transaction
+// by calling `BeginTransaction()`.
+// Whether an error is abortable or not is detected by calling
+// `err.(kafka.Error).TxnRequiresAbort()` on the returned error object.
+//
+// Fatal errors:
+// While the underlying idempotent producer will typically only raise
+// fatal errors for unrecoverable cluster errors where the idempotency
+// guarantees can't be maintained, most of these are treated as abortable by
+// the transactional producer since transactions may be aborted and retried
+// in their entirety;
+// The transactional producer on the other hand introduces a set of additional
+// fatal errors which the application needs to handle by shutting down the
+// producer and terminate. There is no way for a producer instance to recover
+// from fatal errors.
+// Whether an error is fatal or not is detected by calling
+// `err.(kafka.Error).IsFatal()` on the returned error object or by checking
+// the global `GetFatalError()`.
+//
+// Handling of other errors:
+// For errors that have neither retriable, abortable or the fatal flag set
+// it is not always obvious how to handle them. While some of these errors
+// may be indicative of bugs in the application code, such as when
+// an invalid parameter is passed to a method, other errors might originate
+// from the broker and be passed thru as-is to the application.
+// The general recommendation is to treat these errors, that have
+// neither the retriable or abortable flags set, as fatal.
+//
+// Error handling example:
+//     retry:
+//
+//        err := producer.CommitTransaction(...)
+//        if err == nil {
+//            return nil
+//        } else if err.(kafka.Error).TxnRequiresAbort() {
+//            do_abort_transaction_and_reset_inputs()
+//        } else if err.(kafka.Error).IsRetriable() {
+//            goto retry
+//        } else { // treat all other errors as fatal errors
+//            panic(err)
+//        }
+//
+//
+// Events
+//
+// Apart from emitting messages and delivery reports the client also communicates
+// with the application through a number of different event types.
+// An application may choose to handle or ignore these events.
+//
+// Consumer events
+//
+// * `*kafka.Message` - a fetched message.
+//
+// * `AssignedPartitions` - The assigned partition set for this client following a rebalance.
+// Requires `go.application.rebalance.enable`
+//
+// * `RevokedPartitions` - The counter part to `AssignedPartitions` following a rebalance.
+// `AssignedPartitions` and `RevokedPartitions` are symmetrical.
+// Requires `go.application.rebalance.enable`
+//
+// * `PartitionEOF` - Consumer has reached the end of a partition.
+// NOTE: The consumer will keep trying to fetch new messages for the partition.
+//
+// * `OffsetsCommitted` - Offset commit results (when `enable.auto.commit` is enabled).
+//
+//
+// Producer events
+//
+// * `*kafka.Message` - delivery report for produced message.
+// Check `.TopicPartition.Error` for delivery result.
+//
+//
+// Generic events for both Consumer and Producer
+//
+// * `KafkaError` - client (error codes are prefixed with _) or broker error.
+// These errors are normally just informational since the
+// client will try its best to automatically recover (eventually).
+//
+// * `OAuthBearerTokenRefresh` - retrieval of a new SASL/OAUTHBEARER token is required.
+// This event only occurs with sasl.mechanism=OAUTHBEARER.
+// Be sure to invoke SetOAuthBearerToken() on the Producer/Consumer/AdminClient
+// instance when a successful token retrieval is completed, otherwise be sure to
+// invoke SetOAuthBearerTokenFailure() to indicate that retrieval failed (or
+// if setting the token failed, which could happen if an extension doesn't meet
+// the required regular expression); invoking SetOAuthBearerTokenFailure() will
+// schedule a new event for 10 seconds later so another retrieval can be attempted.
+//
+//
+// Hint: If your application registers a signal notification
+// (signal.Notify) makes sure the signals channel is buffered to avoid
+// possible complications with blocking Poll() calls.
+//
+// Note: The Confluent Kafka Go client is safe for concurrent use.
+package kafka
+
+import (
+	"fmt"
+	// Make sure librdkafka_vendor/ sub-directory is included in vendor pulls.
+	_ "github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include <string.h>
+#include "select_rdkafka.h"
+
+static rd_kafka_topic_partition_t *_c_rdkafka_topic_partition_list_entry(rd_kafka_topic_partition_list_t *rktparlist, int idx) {
+   return idx < rktparlist->cnt ? &rktparlist->elems[idx] : NULL;
+}
+*/
+import "C"
+
+// PartitionAny represents any partition (for partitioning),
+// or unspecified value (for all other cases)
+const PartitionAny = int32(C.RD_KAFKA_PARTITION_UA)
+
+// TopicPartition is a generic placeholder for a Topic+Partition and optionally Offset.
+type TopicPartition struct {
+	Topic     *string
+	Partition int32
+	Offset    Offset
+	Metadata  *string
+	Error     error
+}
+
+func (p TopicPartition) String() string {
+	topic := "<null>"
+	if p.Topic != nil {
+		topic = *p.Topic
+	}
+	if p.Error != nil {
+		return fmt.Sprintf("%s[%d]@%s(%s)",
+			topic, p.Partition, p.Offset, p.Error)
+	}
+	return fmt.Sprintf("%s[%d]@%s",
+		topic, p.Partition, p.Offset)
+}
+
+// TopicPartitions is a slice of TopicPartitions that also implements
+// the sort interface
+type TopicPartitions []TopicPartition
+
+func (tps TopicPartitions) Len() int {
+	return len(tps)
+}
+
+func (tps TopicPartitions) Less(i, j int) bool {
+	if *tps[i].Topic < *tps[j].Topic {
+		return true
+	} else if *tps[i].Topic > *tps[j].Topic {
+		return false
+	}
+	return tps[i].Partition < tps[j].Partition
+}
+
+func (tps TopicPartitions) Swap(i, j int) {
+	tps[i], tps[j] = tps[j], tps[i]
+}
+
+// new_cparts_from_TopicPartitions creates a new C rd_kafka_topic_partition_list_t
+// from a TopicPartition array.
+func newCPartsFromTopicPartitions(partitions []TopicPartition) (cparts *C.rd_kafka_topic_partition_list_t) {
+	cparts = C.rd_kafka_topic_partition_list_new(C.int(len(partitions)))
+	for _, part := range partitions {
+		ctopic := C.CString(*part.Topic)
+		defer C.free(unsafe.Pointer(ctopic))
+		rktpar := C.rd_kafka_topic_partition_list_add(cparts, ctopic, C.int32_t(part.Partition))
+		rktpar.offset = C.int64_t(part.Offset)
+
+		if part.Metadata != nil {
+			cmetadata := C.CString(*part.Metadata)
+			rktpar.metadata = unsafe.Pointer(cmetadata)
+			rktpar.metadata_size = C.size_t(len(*part.Metadata))
+		}
+	}
+
+	return cparts
+}
+
+func setupTopicPartitionFromCrktpar(partition *TopicPartition, crktpar *C.rd_kafka_topic_partition_t) {
+
+	topic := C.GoString(crktpar.topic)
+	partition.Topic = &topic
+	partition.Partition = int32(crktpar.partition)
+	partition.Offset = Offset(crktpar.offset)
+	if crktpar.metadata_size > 0 {
+		size := C.int(crktpar.metadata_size)
+		cstr := (*C.char)(unsafe.Pointer(crktpar.metadata))
+		metadata := C.GoStringN(cstr, size)
+		partition.Metadata = &metadata
+	}
+	if crktpar.err != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		partition.Error = newError(crktpar.err)
+	}
+}
+
+func newTopicPartitionsFromCparts(cparts *C.rd_kafka_topic_partition_list_t) (partitions []TopicPartition) {
+
+	partcnt := int(cparts.cnt)
+
+	partitions = make([]TopicPartition, partcnt)
+	for i := 0; i < partcnt; i++ {
+		crktpar := C._c_rdkafka_topic_partition_list_entry(cparts, C.int(i))
+		setupTopicPartitionFromCrktpar(&partitions[i], crktpar)
+	}
+
+	return partitions
+}
+
+// LibraryVersion returns the underlying librdkafka library version as a
+// (version_int, version_str) tuple.
+func LibraryVersion() (int, string) {
+	ver := (int)(C.rd_kafka_version())
+	verstr := C.GoString(C.rd_kafka_version_str())
+	return ver, verstr
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/.gitignore

@@ -0,0 +1,3 @@
+*.tar.gz
+*.tgz
+tmp*

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/LICENSES.txt

@@ -0,0 +1,366 @@
+LICENSE
+--------------------------------------------------------------
+librdkafka - Apache Kafka C driver library
+
+Copyright (c) 2012-2020, Magnus Edenhill
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+
+LICENSE.crc32c
+--------------------------------------------------------------
+# For src/crc32c.c copied (with modifications) from
+# http://stackoverflow.com/a/17646775/1821055
+
+/* crc32c.c -- compute CRC-32C using the Intel crc32 instruction
+ * Copyright (C) 2013 Mark Adler
+ * Version 1.1  1 Aug 2013  Mark Adler
+ */
+
+/*
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the author be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Mark Adler
+  madler@alumni.caltech.edu
+ */
+
+
+LICENSE.fnv1a
+--------------------------------------------------------------
+parts of src/rdfnv1a.c: http://www.isthe.com/chongo/src/fnv/hash_32a.c
+
+
+Please do not copyright this code.  This code is in the public domain.
+
+LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
+EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+By:
+    chongo <Landon Curt Noll> /\oo/\
+    http://www.isthe.com/chongo/
+
+Share and Enjoy!	:-)
+
+
+LICENSE.hdrhistogram
+--------------------------------------------------------------
+This license covers src/rdhdrhistogram.c which is a C port of
+Coda Hale's Golang HdrHistogram https://github.com/codahale/hdrhistogram
+at revision 3a0bb77429bd3a61596f5e8a3172445844342120
+
+-----------------------------------------------------------------------------
+
+The MIT License (MIT)
+
+Copyright (c) 2014 Coda Hale
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE
+
+
+LICENSE.lz4
+--------------------------------------------------------------
+src/rdxxhash.[ch] src/lz4*.[ch]: git@github.com:lz4/lz4.git e2827775ee80d2ef985858727575df31fc60f1f3
+
+LZ4 Library
+Copyright (c) 2011-2016, Yann Collet
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+LICENSE.murmur2
+--------------------------------------------------------------
+parts of src/rdmurmur2.c: git@github.com:abrandoned/murmur2.git
+
+
+MurMurHash2 Library
+//-----------------------------------------------------------------------------
+// MurmurHash2 was written by Austin Appleby, and is placed in the public
+// domain. The author hereby disclaims copyright to this source code.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+
+LICENSE.pycrc
+--------------------------------------------------------------
+The following license applies to the files rdcrc32.c and rdcrc32.h which
+have been generated by the pycrc tool.
+============================================================================
+
+Copyright (c) 2006-2012, Thomas Pircher <tehpeh@gmx.net>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+
+LICENSE.queue
+--------------------------------------------------------------
+For sys/queue.h:
+
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)queue.h	8.5 (Berkeley) 8/20/94
+ * $FreeBSD$
+
+LICENSE.regexp
+--------------------------------------------------------------
+regexp.c and regexp.h from https://github.com/ccxvii/minilibs sha 875c33568b5a4aa4fb3dd0c52ea98f7f0e5ca684
+
+"
+These libraries are in the public domain (or the equivalent where that is not possible). You can do anything you want with them. You have no legal obligation to do anything else, although I appreciate attribution.
+"
+
+
+LICENSE.snappy
+--------------------------------------------------------------
+######################################################################
+# LICENSE.snappy covers files: snappy.c, snappy.h, snappy_compat.h   #
+# originally retrieved from http://github.com/andikleen/snappy-c     #
+# git revision 8015f2d28739b9a6076ebaa6c53fe27bc238d219              #
+######################################################################
+
+The snappy-c code is under the same license as the original snappy source
+
+Copyright 2011 Intel Corporation All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Intel Corporation nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+
+LICENSE.tinycthread
+--------------------------------------------------------------
+From https://github.com/tinycthread/tinycthread/README.txt c57166cd510ffb5022dd5f127489b131b61441b9
+
+License
+-------
+
+Copyright (c) 2012 Marcus Geelnard
+              2013-2014 Evan Nemerson
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+
+
+LICENSE.wingetopt
+--------------------------------------------------------------
+For the files wingetopt.c wingetopt.h downloaded from https://github.com/alex85k/wingetopt
+
+/*
+ * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+/*-
+ * Copyright (c) 2000 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Dieter Baron and Thomas Klausner.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/README.md

@@ -0,0 +1,24 @@
+# Bundling prebuilt librdkafka
+
+confluent-kafka-go bundles prebuilt statically linked
+versions of librdkafka for the following platforms:
+
+ * MacOSX x64      (aka Darwin)
+ * Linux glibc x64 (Ubuntu, CentOS, etc)
+ * Linux musl x64  (Alpine)
+
+## Import static librdkafka bundle
+
+First create the static librdkafka bundle following the instructions in
+librdkafka's packaging/nuget/README.md.
+
+Then import the new version by using the import.sh script here, this script
+will create a branch, import the bundle, create a commit and push the
+branch to Github for PR review. This PR must be manually opened, reviewed
+and then finally merged (make sure to merge it, DO NOT squash or rebase).
+
+    $ ./import.sh ~/path/to/librdkafka-static-bundle-v1.4.0.tgz
+
+This will copy the static library and the rdkafka.h header file
+to this directory, as well as generate a new ../build_..go file
+for this platform + variant.

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/bundle-import.sh

@@ -0,0 +1,113 @@
+#!/bin/bash
+#
+# Updates the bundled prebuilt librdkafka libraries to specified version.
+#
+
+set -e
+
+
+usage() {
+    echo "Usage: $0 librdkafka-static-bundle-<VERSION>.tgz"
+    echo ""
+    echo "This tool must be run from the TOPDIR/kafka/librdkafka_vendor directory"
+    exit 1
+}
+
+
+parse_dynlibs() {
+    # Parse dynamic libraries from pkg-config file,
+    # both the ones specified with Libs: but also through Requires:
+    local pc=$1
+    local libs=
+    local req=
+    local n=
+    for req in $(grep ^Requires: $pc | sed -e 's/^Requires://'); do
+        n=$(pkg-config --libs $req)
+        if [[ $n == -l* ]]; then
+            libs="${libs} $n"
+        fi
+    done
+    for n in $(grep ^Libs: $pc); do
+        if [[ $n == -l* ]]; then
+            libs="${libs} $n"
+        fi
+    done
+
+    echo "$libs"
+}
+
+setup_build() {
+    # Copies static library from the temp directory into final location,
+    # extracts dynamic lib list from the pkg-config file,
+    # and generates the build_..go file
+    local btype=$1
+    local apath=$2
+    local pc=$3
+    local srcinfo=$4
+    local build_tag=
+    local gpath="../build_${btype}.go"
+    local dpath="librdkafka_${btype}.a"
+
+    if [[ $btype == glibc_linux ]]; then
+        build_tag="// +build !musl"
+    elif [[ $btype == musl_linux ]]; then
+        build_tag="// +build musl"
+    fi
+
+    local dynlibs=$(parse_dynlibs $pc)
+
+    echo "Copying $apath to $dpath"
+    cp "$apath" "$dpath"
+
+    echo "Generating $gpath (extra build tag: $build_tag)"
+
+    cat >$gpath <<EOF
+// +build !dynamic
+$build_tag
+
+// This file was auto-generated by librdkafka_vendor/bundle-import.sh, DO NOT EDIT.
+
+package kafka
+
+// #cgo CFLAGS: -DUSE_VENDORED_LIBRDKAFKA -DLIBRDKAFKA_STATICLIB
+// #cgo LDFLAGS: \${SRCDIR}/librdkafka_vendor/${dpath} $dynlibs
+import "C"
+
+// LibrdkafkaLinkInfo explains how librdkafka was linked to the Go client
+const LibrdkafkaLinkInfo = "static ${btype} from ${srcinfo}"
+EOF
+
+    git add "$dpath" "$gpath"
+
+}
+
+
+bundle="$1"
+[[ -f $bundle ]] || usage
+
+bundlename=$(basename "$bundle")
+
+bdir=$(mktemp -d tmpXXXXXX)
+
+echo "Extracting bundle $bundle:"
+tar -xzvf "$bundle" -C "$bdir/"
+
+echo "Copying librdkafka files"
+for f in rdkafka.h LICENSES.txt ; do
+    cp $bdir/$f . || true
+    git add "$f"
+done
+
+
+for btype in glibc_linux musl_linux darwin windows ; do
+    lib=$bdir/librdkafka_${btype}.a
+    pc=${lib/%.a/.pc}
+    [[ -f $lib ]] || (echo "Expected file $lib missing" ; exit 1)
+    [[ -f $pc ]] || (echo "Expected file $pc missing" ; exit 1)
+
+    setup_build $btype $lib $pc $bundlename
+done
+
+rm -rf "$bdir"
+
+echo "All done"

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/import.sh

@@ -0,0 +1,110 @@
+#!/bin/bash
+#
+#
+# Import a new version of librdkafka based on a librdkafka static bundle.
+# This will create a separate branch, import librdkafka, make a commit,
+# and then ask you to push the branch to github, have it reviewed,
+# and then later merged (NOT squashed or rebased).
+# Having a merge per import allows future shallow clones to skip and ignore
+# older imports, hopefully reducing the amount of git history data 'go get'
+# needs to download.
+
+set -e
+
+usage() {
+    echo "Usage: $0 [--devel] path/to/librdkafka-static-bundle-<VERSION>.tgz"
+    echo ""
+    echo "This tool must be run from the TOPDIR/kafka/librdkafka directory"
+    echo ""
+    echo "Options:"
+    echo "  --devel  - Development use: No branch checks and does not push to github"
+    exit 1
+}
+
+error_cleanup() {
+    echo "Error occurred, cleaning up"
+    git checkout $currbranch
+    git branch -D $import_branch
+    exit 1
+}
+
+devel=0
+if [[ $1 == --devel ]]; then
+    devel=1
+    shift
+fi
+
+bundle="$1"
+[[ -f $bundle ]] || usage
+
+# Parse the librdkafka version from the bundle
+bundlename=$(basename $bundle)
+version=${bundlename#librdkafka-static-bundle-}
+version=${version%.tgz}
+
+if [[ -z $version ]]; then
+    echo "Error: Could not parse version from bundle $bundle"
+    exit 1
+fi
+
+# Verify branch state
+curr_branch=$(git symbolic-ref HEAD 2>/dev/null | cut -d"/" -f 3-)
+uncommitted=$(git status --untracked-files=no --porcelain)
+
+if [[ $devel != 1 ]] && ( [[ $curr_branch != master ]] || [[ ! -z $uncommitted ]] ); then
+    echo "Error: This script must be run on an up-to-date, clean, master branch"
+    if [[ ! -z $uncommitted ]]; then
+        echo "Uncommitted files:"
+        echo "$uncommitted"
+    fi
+    exit 1
+fi
+
+
+# Create import branch, import bundle, commit.
+import_branch="import_$version"
+
+exists=$(git branch -rlq | grep "/$import_branch\$" || true)
+if [[ ! -z $exists ]]; then
+    echo "Error: This version branch already seems to exist: $exists: already imorted?"
+    [[ $devel != 1 ]] && exit 1
+fi
+
+echo "Checking for existing commits that match this version (should be none)"
+git log --oneline | grep "^librdkafka static bundle $version\$" && exit 1
+
+
+echo "Creating import branch $import_branch"
+git checkout -b $import_branch
+
+echo "Importing bundle $bundle"
+./bundle-import.sh "$bundle" || error_cleanup
+
+echo "Committing $version"
+git commit -a -m "librdkafka static bundle $version" || error_cleanup
+
+echo "Updating error codes and docs"
+pushd ../../
+make -f mk/Makefile docs || error_cleanup
+git commit -a -m "Documentation and error code update for librdkafka $version" \
+    || error_cleanup
+popd
+
+if [[ $devel != 1 ]]; then
+    echo "Pushing branch"
+    git push origin $import_branch || error_cleanup
+fi
+
+git checkout $curr_branch
+
+if [[ $devel != 1 ]]; then
+    git branch -D $import_branch
+fi
+
+echo ""
+echo "############## IMPORT OF $version COMPLETE ##############"
+if [[ $devel != 1 ]]; then
+    echo "Branch $import_branch has been pushed."
+    echo "Create a PR, have it reviewed and then merge it (do NOT squash or rebase)."
+fi
+

vendor/github.com/confluentinc/confluent-kafka-go/kafka/librdkafka_vendor/librdkafka.go

@@ -0,0 +1,21 @@
+/**
+ * Copyright 2020 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package librdkafka
+
+// LibrdkafkaGoSubdir is a dummy variable needed to export something so the
+// file is not empty.
+var LibrdkafkaGoSubdir = true

vendor/github.com/confluentinc/confluent-kafka-go/kafka/log.go

@@ -0,0 +1,89 @@
+package kafka
+
+import (
+	"fmt"
+	"time"
+)
+
+/*
+#include "select_rdkafka.h"
+*/
+import "C"
+
+// LogEvent represent the log from librdkafka internal log queue
+type LogEvent struct {
+	Name      string    // Name of client instance
+	Tag       string    // Log tag that provides context to the log Message (e.g., "METADATA" or "GRPCOORD")
+	Message   string    // Log message
+	Level     int       // Log syslog level, lower is more critical.
+	Timestamp time.Time // Log timestamp
+}
+
+// newLogEvent creates a new LogEvent from the given rd_kafka_event_t.
+//
+// This function does not take ownership of the cEvent pointer. You need to
+// free its resources using C.rd_kafka_event_destroy afterwards.
+//
+// The cEvent object needs to be of type C.RD_KAFKA_EVENT_LOG. Calling this
+// function with an object of another type has undefined behaviour.
+func (h *handle) newLogEvent(cEvent *C.rd_kafka_event_t) LogEvent {
+	var tag, message *C.char
+	var level C.int
+
+	C.rd_kafka_event_log(cEvent, &(tag), &(message), &(level))
+
+	return LogEvent{
+		Name:      h.name,
+		Tag:       C.GoString(tag),
+		Message:   C.GoString(message),
+		Level:     int(level),
+		Timestamp: time.Now(),
+	}
+}
+
+// pollLogEvents polls log events from librdkafka and pushes them to toChannel,
+// until doneChan is closed.
+//
+// Each call to librdkafka times out after timeoutMs. If a call to librdkafka
+// is ongoing when doneChan is closed, the function will wait until the call
+// returns or times out, whatever happens first.
+func (h *handle) pollLogEvents(toChannel chan LogEvent, timeoutMs int, doneChan chan bool) {
+	for {
+		select {
+		case <-doneChan:
+			return
+
+		default:
+			cEvent := C.rd_kafka_queue_poll(h.logq, C.int(timeoutMs))
+			if cEvent == nil {
+				continue
+			}
+
+			if C.rd_kafka_event_type(cEvent) != C.RD_KAFKA_EVENT_LOG {
+				C.rd_kafka_event_destroy(cEvent)
+				continue
+			}
+
+			logEvent := h.newLogEvent(cEvent)
+			C.rd_kafka_event_destroy(cEvent)
+
+			select {
+			case <-doneChan:
+				return
+
+			case toChannel <- logEvent:
+				continue
+			}
+		}
+	}
+}
+
+func (logEvent LogEvent) String() string {
+	return fmt.Sprintf(
+		"[%v][%s][%s][%d]%s",
+		logEvent.Timestamp.Format(time.RFC3339),
+		logEvent.Name,
+		logEvent.Tag,
+		logEvent.Level,
+		logEvent.Message)
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/message.go

@@ -0,0 +1,223 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"fmt"
+	"time"
+	"unsafe"
+)
+
+/*
+#include <string.h>
+#include <stdlib.h>
+#include "select_rdkafka.h"
+#include "glue_rdkafka.h"
+
+void setup_rkmessage (rd_kafka_message_t *rkmessage,
+                      rd_kafka_topic_t *rkt, int32_t partition,
+                      const void *payload, size_t len,
+                      void *key, size_t keyLen, void *opaque) {
+     rkmessage->rkt       = rkt;
+     rkmessage->partition = partition;
+     rkmessage->payload   = (void *)payload;
+     rkmessage->len       = len;
+     rkmessage->key       = (void *)key;
+     rkmessage->key_len   = keyLen;
+     rkmessage->_private  = opaque;
+}
+*/
+import "C"
+
+// TimestampType is a the Message timestamp type or source
+//
+type TimestampType int
+
+const (
+	// TimestampNotAvailable indicates no timestamp was set, or not available due to lacking broker support
+	TimestampNotAvailable = TimestampType(C.RD_KAFKA_TIMESTAMP_NOT_AVAILABLE)
+	// TimestampCreateTime indicates timestamp set by producer (source time)
+	TimestampCreateTime = TimestampType(C.RD_KAFKA_TIMESTAMP_CREATE_TIME)
+	// TimestampLogAppendTime indicates timestamp set set by broker (store time)
+	TimestampLogAppendTime = TimestampType(C.RD_KAFKA_TIMESTAMP_LOG_APPEND_TIME)
+)
+
+func (t TimestampType) String() string {
+	switch t {
+	case TimestampCreateTime:
+		return "CreateTime"
+	case TimestampLogAppendTime:
+		return "LogAppendTime"
+	case TimestampNotAvailable:
+		fallthrough
+	default:
+		return "NotAvailable"
+	}
+}
+
+// Message represents a Kafka message
+type Message struct {
+	TopicPartition TopicPartition
+	Value          []byte
+	Key            []byte
+	Timestamp      time.Time
+	TimestampType  TimestampType
+	Opaque         interface{}
+	Headers        []Header
+}
+
+// String returns a human readable representation of a Message.
+// Key and payload are not represented.
+func (m *Message) String() string {
+	var topic string
+	if m.TopicPartition.Topic != nil {
+		topic = *m.TopicPartition.Topic
+	} else {
+		topic = ""
+	}
+	return fmt.Sprintf("%s[%d]@%s", topic, m.TopicPartition.Partition, m.TopicPartition.Offset)
+}
+
+func (h *handle) getRktFromMessage(msg *Message) (crkt *C.rd_kafka_topic_t) {
+	if msg.TopicPartition.Topic == nil {
+		return nil
+	}
+
+	return h.getRkt(*msg.TopicPartition.Topic)
+}
+
+// setupHeadersFromGlueMsg converts the C tmp headers in gMsg to
+// Go Headers in msg.
+// gMsg.tmphdrs will be freed.
+func setupHeadersFromGlueMsg(msg *Message, gMsg *C.glue_msg_t) {
+	msg.Headers = make([]Header, gMsg.tmphdrsCnt)
+	for n := range msg.Headers {
+		tmphdr := (*[1 << 30]C.tmphdr_t)(unsafe.Pointer(gMsg.tmphdrs))[n]
+		msg.Headers[n].Key = C.GoString(tmphdr.key)
+		if tmphdr.val != nil {
+			msg.Headers[n].Value = C.GoBytes(unsafe.Pointer(tmphdr.val), C.int(tmphdr.size))
+		} else {
+			msg.Headers[n].Value = nil
+		}
+	}
+	C.free(unsafe.Pointer(gMsg.tmphdrs))
+}
+
+func (h *handle) newMessageFromGlueMsg(gMsg *C.glue_msg_t) (msg *Message) {
+	msg = &Message{}
+
+	if gMsg.ts != -1 {
+		ts := int64(gMsg.ts)
+		msg.TimestampType = TimestampType(gMsg.tstype)
+		msg.Timestamp = time.Unix(ts/1000, (ts%1000)*1000000)
+	}
+
+	if gMsg.tmphdrsCnt > 0 {
+		setupHeadersFromGlueMsg(msg, gMsg)
+	}
+
+	h.setupMessageFromC(msg, gMsg.msg)
+
+	return msg
+}
+
+// setupMessageFromC sets up a message object from a C rd_kafka_message_t
+func (h *handle) setupMessageFromC(msg *Message, cmsg *C.rd_kafka_message_t) {
+	if cmsg.rkt != nil {
+		topic := h.getTopicNameFromRkt(cmsg.rkt)
+		msg.TopicPartition.Topic = &topic
+	}
+	msg.TopicPartition.Partition = int32(cmsg.partition)
+	if cmsg.payload != nil && h.msgFields.Value {
+		msg.Value = C.GoBytes(unsafe.Pointer(cmsg.payload), C.int(cmsg.len))
+	}
+	if cmsg.key != nil && h.msgFields.Key {
+		msg.Key = C.GoBytes(unsafe.Pointer(cmsg.key), C.int(cmsg.key_len))
+	}
+	if h.msgFields.Headers {
+		var gMsg C.glue_msg_t
+		gMsg.msg = cmsg
+		gMsg.want_hdrs = C.int8_t(1)
+		chdrsToTmphdrs(&gMsg)
+		if gMsg.tmphdrsCnt > 0 {
+			setupHeadersFromGlueMsg(msg, &gMsg)
+		}
+	}
+	msg.TopicPartition.Offset = Offset(cmsg.offset)
+	if cmsg.err != 0 {
+		msg.TopicPartition.Error = newError(cmsg.err)
+	}
+}
+
+// newMessageFromC creates a new message object from a C rd_kafka_message_t
+// NOTE: For use with Producer: does not set message timestamp fields.
+func (h *handle) newMessageFromC(cmsg *C.rd_kafka_message_t) (msg *Message) {
+	msg = &Message{}
+
+	h.setupMessageFromC(msg, cmsg)
+
+	return msg
+}
+
+// messageToC sets up cmsg as a clone of msg
+func (h *handle) messageToC(msg *Message, cmsg *C.rd_kafka_message_t) {
+	var valp unsafe.Pointer
+	var keyp unsafe.Pointer
+
+	// to circumvent Cgo constraints we need to allocate C heap memory
+	// for both Value and Key (one allocation back to back)
+	// and copy the bytes from Value and Key to the C memory.
+	// We later tell librdkafka (in produce()) to free the
+	// C memory pointer when it is done.
+	var payload unsafe.Pointer
+
+	valueLen := 0
+	keyLen := 0
+	if msg.Value != nil {
+		valueLen = len(msg.Value)
+	}
+	if msg.Key != nil {
+		keyLen = len(msg.Key)
+	}
+
+	allocLen := valueLen + keyLen
+	if allocLen > 0 {
+		payload = C.malloc(C.size_t(allocLen))
+		if valueLen > 0 {
+			copy((*[1 << 30]byte)(payload)[0:valueLen], msg.Value)
+			valp = payload
+		}
+		if keyLen > 0 {
+			copy((*[1 << 30]byte)(payload)[valueLen:allocLen], msg.Key)
+			keyp = unsafe.Pointer(&((*[1 << 31]byte)(payload)[valueLen]))
+		}
+	}
+
+	cmsg.rkt = h.getRktFromMessage(msg)
+	cmsg.partition = C.int32_t(msg.TopicPartition.Partition)
+	cmsg.payload = valp
+	cmsg.len = C.size_t(valueLen)
+	cmsg.key = keyp
+	cmsg.key_len = C.size_t(keyLen)
+	cmsg._private = nil
+}
+
+// used for testing messageToC performance
+func (h *handle) messageToCDummy(msg *Message) {
+	var cmsg C.rd_kafka_message_t
+	h.messageToC(msg, &cmsg)
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/metadata.go

@@ -0,0 +1,180 @@
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import (
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+
+struct rd_kafka_metadata_broker *_getMetadata_broker_element(struct rd_kafka_metadata *m, int i) {
+  return &m->brokers[i];
+}
+
+struct rd_kafka_metadata_topic *_getMetadata_topic_element(struct rd_kafka_metadata *m, int i) {
+  return &m->topics[i];
+}
+
+struct rd_kafka_metadata_partition *_getMetadata_partition_element(struct rd_kafka_metadata *m, int topic_idx, int partition_idx) {
+  return &m->topics[topic_idx].partitions[partition_idx];
+}
+
+int32_t _get_int32_element (int32_t *arr, int i) {
+  return arr[i];
+}
+
+*/
+import "C"
+
+// BrokerMetadata contains per-broker metadata
+type BrokerMetadata struct {
+	ID   int32
+	Host string
+	Port int
+}
+
+// PartitionMetadata contains per-partition metadata
+type PartitionMetadata struct {
+	ID       int32
+	Error    Error
+	Leader   int32
+	Replicas []int32
+	Isrs     []int32
+}
+
+// TopicMetadata contains per-topic metadata
+type TopicMetadata struct {
+	Topic      string
+	Partitions []PartitionMetadata
+	Error      Error
+}
+
+// Metadata contains broker and topic metadata for all (matching) topics
+type Metadata struct {
+	Brokers []BrokerMetadata
+	Topics  map[string]TopicMetadata
+
+	OriginatingBroker BrokerMetadata
+}
+
+// getMetadata queries broker for cluster and topic metadata.
+// If topic is non-nil only information about that topic is returned, else if
+// allTopics is false only information about locally used topics is returned,
+// else information about all topics is returned.
+func getMetadata(H Handle, topic *string, allTopics bool, timeoutMs int) (*Metadata, error) {
+	h := H.gethandle()
+
+	var rkt *C.rd_kafka_topic_t
+	if topic != nil {
+		rkt = h.getRkt(*topic)
+	}
+
+	var cMd *C.struct_rd_kafka_metadata
+	cErr := C.rd_kafka_metadata(h.rk, bool2cint(allTopics),
+		rkt, &cMd, C.int(timeoutMs))
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cErr)
+	}
+
+	m := Metadata{}
+	defer C.rd_kafka_metadata_destroy(cMd)
+
+	m.Brokers = make([]BrokerMetadata, cMd.broker_cnt)
+	for i := 0; i < int(cMd.broker_cnt); i++ {
+		b := C._getMetadata_broker_element(cMd, C.int(i))
+		m.Brokers[i] = BrokerMetadata{int32(b.id), C.GoString(b.host),
+			int(b.port)}
+	}
+
+	m.Topics = make(map[string]TopicMetadata, int(cMd.topic_cnt))
+	for i := 0; i < int(cMd.topic_cnt); i++ {
+		t := C._getMetadata_topic_element(cMd, C.int(i))
+
+		thisTopic := C.GoString(t.topic)
+		m.Topics[thisTopic] = TopicMetadata{Topic: thisTopic,
+			Error:      newError(t.err),
+			Partitions: make([]PartitionMetadata, int(t.partition_cnt))}
+
+		for j := 0; j < int(t.partition_cnt); j++ {
+			p := C._getMetadata_partition_element(cMd, C.int(i), C.int(j))
+			m.Topics[thisTopic].Partitions[j] = PartitionMetadata{
+				ID:     int32(p.id),
+				Error:  newError(p.err),
+				Leader: int32(p.leader)}
+			m.Topics[thisTopic].Partitions[j].Replicas = make([]int32, int(p.replica_cnt))
+			for ir := 0; ir < int(p.replica_cnt); ir++ {
+				m.Topics[thisTopic].Partitions[j].Replicas[ir] = int32(C._get_int32_element(p.replicas, C.int(ir)))
+			}
+
+			m.Topics[thisTopic].Partitions[j].Isrs = make([]int32, int(p.isr_cnt))
+			for ii := 0; ii < int(p.isr_cnt); ii++ {
+				m.Topics[thisTopic].Partitions[j].Isrs[ii] = int32(C._get_int32_element(p.isrs, C.int(ii)))
+			}
+		}
+	}
+
+	m.OriginatingBroker = BrokerMetadata{int32(cMd.orig_broker_id),
+		C.GoString(cMd.orig_broker_name), 0}
+
+	return &m, nil
+}
+
+// queryWatermarkOffsets returns the broker's low and high offsets for the given topic
+// and partition.
+func queryWatermarkOffsets(H Handle, topic string, partition int32, timeoutMs int) (low, high int64, err error) {
+	h := H.gethandle()
+
+	ctopic := C.CString(topic)
+	defer C.free(unsafe.Pointer(ctopic))
+
+	var cLow, cHigh C.int64_t
+
+	e := C.rd_kafka_query_watermark_offsets(h.rk, ctopic, C.int32_t(partition),
+		&cLow, &cHigh, C.int(timeoutMs))
+	if e != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return 0, 0, newError(e)
+	}
+
+	low = int64(cLow)
+	high = int64(cHigh)
+	return low, high, nil
+}
+
+// getWatermarkOffsets returns the clients cached low and high offsets for the given topic
+// and partition.
+func getWatermarkOffsets(H Handle, topic string, partition int32) (low, high int64, err error) {
+	h := H.gethandle()
+
+	ctopic := C.CString(topic)
+	defer C.free(unsafe.Pointer(ctopic))
+
+	var cLow, cHigh C.int64_t
+
+	e := C.rd_kafka_get_watermark_offsets(h.rk, ctopic, C.int32_t(partition),
+		&cLow, &cHigh)
+	if e != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return 0, 0, newError(e)
+	}
+
+	low = int64(cLow)
+	high = int64(cHigh)
+
+	return low, high, nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/misc.go

@@ -0,0 +1,35 @@
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import "C"
+
+// bool2int converts a bool to a C.int (1 or 0)
+func bool2cint(b bool) C.int {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+// cint2bool converts a C.int to a bool
+func cint2bool(v C.int) bool {
+	if v == 0 {
+		return false
+	}
+	return true
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/offset.go

@@ -0,0 +1,145 @@
+/**
+ * Copyright 2017 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import (
+	"fmt"
+	"strconv"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+
+static int64_t _c_rdkafka_offset_tail(int64_t rel) {
+   return RD_KAFKA_OFFSET_TAIL(rel);
+}
+*/
+import "C"
+
+// Offset type (int64) with support for canonical names
+type Offset int64
+
+// OffsetBeginning represents the earliest offset (logical)
+const OffsetBeginning = Offset(C.RD_KAFKA_OFFSET_BEGINNING)
+
+// OffsetEnd represents the latest offset (logical)
+const OffsetEnd = Offset(C.RD_KAFKA_OFFSET_END)
+
+// OffsetInvalid represents an invalid/unspecified offset
+const OffsetInvalid = Offset(C.RD_KAFKA_OFFSET_INVALID)
+
+// OffsetStored represents a stored offset
+const OffsetStored = Offset(C.RD_KAFKA_OFFSET_STORED)
+
+func (o Offset) String() string {
+	switch o {
+	case OffsetBeginning:
+		return "beginning"
+	case OffsetEnd:
+		return "end"
+	case OffsetInvalid:
+		return "unset"
+	case OffsetStored:
+		return "stored"
+	default:
+		return fmt.Sprintf("%d", int64(o))
+	}
+}
+
+// Set offset value, see NewOffset()
+func (o *Offset) Set(offset interface{}) error {
+	n, err := NewOffset(offset)
+
+	if err == nil {
+		*o = n
+	}
+
+	return err
+}
+
+// NewOffset creates a new Offset using the provided logical string, or an
+// absolute int64 offset value.
+// Logical offsets: "beginning", "earliest", "end", "latest", "unset", "invalid", "stored"
+func NewOffset(offset interface{}) (Offset, error) {
+
+	switch v := offset.(type) {
+	case string:
+		switch v {
+		case "beginning":
+			fallthrough
+		case "earliest":
+			return Offset(OffsetBeginning), nil
+
+		case "end":
+			fallthrough
+		case "latest":
+			return Offset(OffsetEnd), nil
+
+		case "unset":
+			fallthrough
+		case "invalid":
+			return Offset(OffsetInvalid), nil
+
+		case "stored":
+			return Offset(OffsetStored), nil
+
+		default:
+			off, err := strconv.Atoi(v)
+			return Offset(off), err
+		}
+
+	case int:
+		return Offset((int64)(v)), nil
+	case int64:
+		return Offset(v), nil
+	default:
+		return OffsetInvalid, newErrorFromString(ErrInvalidArg,
+			fmt.Sprintf("Invalid offset type: %t", v))
+	}
+}
+
+// OffsetTail returns the logical offset relativeOffset from current end of partition
+func OffsetTail(relativeOffset Offset) Offset {
+	return Offset(C._c_rdkafka_offset_tail(C.int64_t(relativeOffset)))
+}
+
+// offsetsForTimes looks up offsets by timestamp for the given partitions.
+//
+// The returned offset for each partition is the earliest offset whose
+// timestamp is greater than or equal to the given timestamp in the
+// corresponding partition. If the provided timestamp exceeds that of the
+// last message in the partition, a value of -1 will be returned.
+//
+// The timestamps to query are represented as `.Offset` in the `times`
+// argument and the looked up offsets are represented as `.Offset` in the returned
+// `offsets` list.
+//
+// The function will block for at most timeoutMs milliseconds.
+//
+// Duplicate Topic+Partitions are not supported.
+// Per-partition errors may be returned in the `.Error` field.
+func offsetsForTimes(H Handle, times []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error) {
+	cparts := newCPartsFromTopicPartitions(times)
+	defer C.rd_kafka_topic_partition_list_destroy(cparts)
+	cerr := C.rd_kafka_offsets_for_times(H.gethandle().rk, cparts, C.int(timeoutMs))
+	if cerr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return nil, newError(cerr)
+	}
+
+	return newTopicPartitionsFromCparts(cparts), nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/producer.go

@@ -0,0 +1,918 @@
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"time"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include "select_rdkafka.h"
+#include "glue_rdkafka.h"
+
+
+#ifdef RD_KAFKA_V_HEADERS
+// Convert tmphdrs to chdrs (created by this function).
+// If tmphdr.size == -1: value is considered Null
+//    tmphdr.size == 0:  value is considered empty (ignored)
+//    tmphdr.size > 0:   value is considered non-empty
+//
+// WARNING: The header keys and values will be freed by this function.
+void tmphdrs_to_chdrs (tmphdr_t *tmphdrs, size_t tmphdrsCnt,
+                       rd_kafka_headers_t **chdrs) {
+   size_t i;
+
+   *chdrs = rd_kafka_headers_new(tmphdrsCnt);
+
+   for (i = 0 ; i < tmphdrsCnt ; i++) {
+      rd_kafka_header_add(*chdrs,
+                          tmphdrs[i].key, -1,
+                          tmphdrs[i].size == -1 ? NULL :
+                          (tmphdrs[i].size == 0 ? "" : tmphdrs[i].val),
+                          tmphdrs[i].size == -1 ? 0 : tmphdrs[i].size);
+      if (tmphdrs[i].size > 0)
+         free((void *)tmphdrs[i].val);
+      free((void *)tmphdrs[i].key);
+   }
+}
+
+#else
+void free_tmphdrs (tmphdr_t *tmphdrs, size_t tmphdrsCnt) {
+   size_t i;
+   for (i = 0 ; i < tmphdrsCnt ; i++) {
+      if (tmphdrs[i].size > 0)
+         free((void *)tmphdrs[i].val);
+      free((void *)tmphdrs[i].key);
+   }
+}
+#endif
+
+
+rd_kafka_resp_err_t do_produce (rd_kafka_t *rk,
+          rd_kafka_topic_t *rkt, int32_t partition,
+          int msgflags,
+          int valIsNull, void *val, size_t val_len,
+          int keyIsNull, void *key, size_t key_len,
+          int64_t timestamp,
+          tmphdr_t *tmphdrs, size_t tmphdrsCnt,
+          uintptr_t cgoid) {
+  void *valp = valIsNull ? NULL : val;
+  void *keyp = keyIsNull ? NULL : key;
+#ifdef RD_KAFKA_V_TIMESTAMP
+rd_kafka_resp_err_t err;
+#ifdef RD_KAFKA_V_HEADERS
+  rd_kafka_headers_t *hdrs = NULL;
+#endif
+#endif
+
+
+  if (tmphdrsCnt > 0) {
+#ifdef RD_KAFKA_V_HEADERS
+     tmphdrs_to_chdrs(tmphdrs, tmphdrsCnt, &hdrs);
+#else
+     free_tmphdrs(tmphdrs, tmphdrsCnt);
+     return RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED;
+#endif
+  }
+
+
+#ifdef RD_KAFKA_V_TIMESTAMP
+  err = rd_kafka_producev(rk,
+        RD_KAFKA_V_RKT(rkt),
+        RD_KAFKA_V_PARTITION(partition),
+        RD_KAFKA_V_MSGFLAGS(msgflags),
+        RD_KAFKA_V_VALUE(valp, val_len),
+        RD_KAFKA_V_KEY(keyp, key_len),
+        RD_KAFKA_V_TIMESTAMP(timestamp),
+#ifdef RD_KAFKA_V_HEADERS
+        RD_KAFKA_V_HEADERS(hdrs),
+#endif
+        RD_KAFKA_V_OPAQUE((void *)cgoid),
+        RD_KAFKA_V_END);
+#ifdef RD_KAFKA_V_HEADERS
+  if (err && hdrs)
+    rd_kafka_headers_destroy(hdrs);
+#endif
+  return err;
+#else
+  if (timestamp)
+      return RD_KAFKA_RESP_ERR__NOT_IMPLEMENTED;
+  if (rd_kafka_produce(rkt, partition, msgflags,
+                       valp, val_len,
+                       keyp, key_len,
+                       (void *)cgoid) == -1)
+      return rd_kafka_last_error();
+  else
+      return RD_KAFKA_RESP_ERR_NO_ERROR;
+#endif
+}
+*/
+import "C"
+
+// Producer implements a High-level Apache Kafka Producer instance
+type Producer struct {
+	events         chan Event
+	produceChannel chan *Message
+	handle         handle
+
+	// Terminates the poller() goroutine
+	pollerTermChan chan bool
+}
+
+// String returns a human readable name for a Producer instance
+func (p *Producer) String() string {
+	return p.handle.String()
+}
+
+// get_handle implements the Handle interface
+func (p *Producer) gethandle() *handle {
+	return &p.handle
+}
+
+func (p *Producer) produce(msg *Message, msgFlags int, deliveryChan chan Event) error {
+	if msg == nil || msg.TopicPartition.Topic == nil || len(*msg.TopicPartition.Topic) == 0 {
+		return newErrorFromString(ErrInvalidArg, "")
+	}
+
+	crkt := p.handle.getRkt(*msg.TopicPartition.Topic)
+
+	// Three problems:
+	//  1) There's a difference between an empty Value or Key (length 0, proper pointer) and
+	//     a null Value or Key (length 0, null pointer).
+	//  2) we need to be able to send a null Value or Key, but the unsafe.Pointer(&slice[0])
+	//     dereference can't be performed on a nil slice.
+	//  3) cgo's pointer checking requires the unsafe.Pointer(slice..) call to be made
+	//     in the call to the C function.
+	//
+	// Solution:
+	//  Keep track of whether the Value or Key were nil (1), but let the valp and keyp pointers
+	//  point to a 1-byte slice (but the length to send is still 0) so that the dereference (2)
+	//  works.
+	//  Then perform the unsafe.Pointer() on the valp and keyp pointers (which now either point
+	//  to the original msg.Value and msg.Key or to the 1-byte slices) in the call to C (3).
+	//
+	var valp []byte
+	var keyp []byte
+	oneByte := []byte{0}
+	var valIsNull C.int
+	var keyIsNull C.int
+	var valLen int
+	var keyLen int
+
+	if msg.Value == nil {
+		valIsNull = 1
+		valLen = 0
+		valp = oneByte
+	} else {
+		valLen = len(msg.Value)
+		if valLen > 0 {
+			valp = msg.Value
+		} else {
+			valp = oneByte
+		}
+	}
+
+	if msg.Key == nil {
+		keyIsNull = 1
+		keyLen = 0
+		keyp = oneByte
+	} else {
+		keyLen = len(msg.Key)
+		if keyLen > 0 {
+			keyp = msg.Key
+		} else {
+			keyp = oneByte
+		}
+	}
+
+	var cgoid int
+
+	// Per-message state that needs to be retained through the C code:
+	//   delivery channel (if specified)
+	//   message opaque   (if specified)
+	// Since these cant be passed as opaque pointers to the C code,
+	// due to cgo constraints, we add them to a per-producer map for lookup
+	// when the C code triggers the callbacks or events.
+	if deliveryChan != nil || msg.Opaque != nil {
+		cgoid = p.handle.cgoPut(cgoDr{deliveryChan: deliveryChan, opaque: msg.Opaque})
+	}
+
+	var timestamp int64
+	if !msg.Timestamp.IsZero() {
+		timestamp = msg.Timestamp.UnixNano() / 1000000
+	}
+
+	// Convert headers to C-friendly tmphdrs
+	var tmphdrs []C.tmphdr_t
+	tmphdrsCnt := len(msg.Headers)
+
+	if tmphdrsCnt > 0 {
+		tmphdrs = make([]C.tmphdr_t, tmphdrsCnt)
+
+		for n, hdr := range msg.Headers {
+			// Make a copy of the key
+			// to avoid runtime panic with
+			// foreign Go pointers in cgo.
+			tmphdrs[n].key = C.CString(hdr.Key)
+			if hdr.Value != nil {
+				tmphdrs[n].size = C.ssize_t(len(hdr.Value))
+				if tmphdrs[n].size > 0 {
+					// Make a copy of the value
+					// to avoid runtime panic with
+					// foreign Go pointers in cgo.
+					tmphdrs[n].val = C.CBytes(hdr.Value)
+				}
+			} else {
+				// null value
+				tmphdrs[n].size = C.ssize_t(-1)
+			}
+		}
+	} else {
+		// no headers, need a dummy tmphdrs of size 1 to avoid index
+		// out of bounds panic in do_produce() call below.
+		// tmphdrsCnt will be 0.
+		tmphdrs = []C.tmphdr_t{{nil, nil, 0}}
+	}
+
+	cErr := C.do_produce(p.handle.rk, crkt,
+		C.int32_t(msg.TopicPartition.Partition),
+		C.int(msgFlags)|C.RD_KAFKA_MSG_F_COPY,
+		valIsNull, unsafe.Pointer(&valp[0]), C.size_t(valLen),
+		keyIsNull, unsafe.Pointer(&keyp[0]), C.size_t(keyLen),
+		C.int64_t(timestamp),
+		(*C.tmphdr_t)(unsafe.Pointer(&tmphdrs[0])), C.size_t(tmphdrsCnt),
+		(C.uintptr_t)(cgoid))
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		if cgoid != 0 {
+			p.handle.cgoGet(cgoid)
+		}
+		return newError(cErr)
+	}
+
+	return nil
+}
+
+// Produce single message.
+// This is an asynchronous call that enqueues the message on the internal
+// transmit queue, thus returning immediately.
+// The delivery report will be sent on the provided deliveryChan if specified,
+// or on the Producer object's Events() channel if not.
+// msg.Timestamp requires librdkafka >= 0.9.4 (else returns ErrNotImplemented),
+// api.version.request=true, and broker >= 0.10.0.0.
+// msg.Headers requires librdkafka >= 0.11.4 (else returns ErrNotImplemented),
+// api.version.request=true, and broker >= 0.11.0.0.
+// Returns an error if message could not be enqueued.
+func (p *Producer) Produce(msg *Message, deliveryChan chan Event) error {
+	return p.produce(msg, 0, deliveryChan)
+}
+
+// Produce a batch of messages.
+// These batches do not relate to the message batches sent to the broker, the latter
+// are collected on the fly internally in librdkafka.
+// WARNING: This is an experimental API.
+// NOTE: timestamps and headers are not supported with this API.
+func (p *Producer) produceBatch(topic string, msgs []*Message, msgFlags int) error {
+	crkt := p.handle.getRkt(topic)
+
+	cmsgs := make([]C.rd_kafka_message_t, len(msgs))
+	for i, m := range msgs {
+		p.handle.messageToC(m, &cmsgs[i])
+	}
+	r := C.rd_kafka_produce_batch(crkt, C.RD_KAFKA_PARTITION_UA, C.int(msgFlags)|C.RD_KAFKA_MSG_F_FREE,
+		(*C.rd_kafka_message_t)(&cmsgs[0]), C.int(len(msgs)))
+	if r == -1 {
+		return newError(C.rd_kafka_last_error())
+	}
+
+	return nil
+}
+
+// Events returns the Events channel (read)
+func (p *Producer) Events() chan Event {
+	return p.events
+}
+
+// Logs returns the Log channel (if enabled), else nil
+func (p *Producer) Logs() chan LogEvent {
+	return p.handle.logs
+}
+
+// ProduceChannel returns the produce *Message channel (write)
+func (p *Producer) ProduceChannel() chan *Message {
+	return p.produceChannel
+}
+
+// Len returns the number of messages and requests waiting to be transmitted to the broker
+// as well as delivery reports queued for the application.
+// Includes messages on ProduceChannel.
+func (p *Producer) Len() int {
+	return len(p.produceChannel) + len(p.events) + int(C.rd_kafka_outq_len(p.handle.rk))
+}
+
+// Flush and wait for outstanding messages and requests to complete delivery.
+// Includes messages on ProduceChannel.
+// Runs until value reaches zero or on timeoutMs.
+// Returns the number of outstanding events still un-flushed.
+func (p *Producer) Flush(timeoutMs int) int {
+	termChan := make(chan bool) // unused stand-in termChan
+
+	d, _ := time.ParseDuration(fmt.Sprintf("%dms", timeoutMs))
+	tEnd := time.Now().Add(d)
+	for p.Len() > 0 {
+		remain := tEnd.Sub(time.Now()).Seconds()
+		if remain <= 0.0 {
+			return p.Len()
+		}
+
+		p.handle.eventPoll(p.events,
+			int(math.Min(100, remain*1000)), 1000, termChan)
+	}
+
+	return 0
+}
+
+// Close a Producer instance.
+// The Producer object or its channels are no longer usable after this call.
+func (p *Producer) Close() {
+	// Wait for poller() (signaled by closing pollerTermChan)
+	// and channel_producer() (signaled by closing ProduceChannel)
+	close(p.pollerTermChan)
+	close(p.produceChannel)
+	p.handle.waitGroup.Wait()
+
+	close(p.events)
+
+	p.handle.cleanup()
+
+	C.rd_kafka_destroy(p.handle.rk)
+}
+
+const (
+	// PurgeInFlight purges messages in-flight to or from the broker.
+	// Purging these messages will void any future acknowledgements from the
+	// broker, making it impossible for the application to know if these
+	// messages were successfully delivered or not.
+	// Retrying these messages may lead to duplicates.
+	PurgeInFlight = int(C.RD_KAFKA_PURGE_F_INFLIGHT)
+
+	// PurgeQueue Purge messages in internal queues.
+	PurgeQueue = int(C.RD_KAFKA_PURGE_F_QUEUE)
+
+	// PurgeNonBlocking Don't wait for background thread queue purging to finish.
+	PurgeNonBlocking = int(C.RD_KAFKA_PURGE_F_NON_BLOCKING)
+)
+
+// Purge messages currently handled by this producer instance.
+//
+// flags is a combination of PurgeQueue, PurgeInFlight and PurgeNonBlocking.
+//
+// The application will need to call Poll(), Flush() or read the Events() channel
+// after this call to serve delivery reports for the purged messages.
+//
+// Messages purged from internal queues fail with the delivery report
+// error code set to ErrPurgeQueue, while purged messages that
+// are in-flight to or from the broker will fail with the error code set to
+// ErrPurgeInflight.
+//
+// Warning: Purging messages that are in-flight to or from the broker
+// will ignore any sub-sequent acknowledgement for these messages
+// received from the broker, effectively making it impossible
+// for the application to know if the messages were successfully
+// produced or not. This may result in duplicate messages if the
+// application retries these messages at a later time.
+//
+// Note: This call may block for a short time while background thread
+// queues are purged.
+//
+// Returns nil on success, ErrInvalidArg if the purge flags are invalid or unknown.
+func (p *Producer) Purge(flags int) error {
+	cErr := C.rd_kafka_purge(p.handle.rk, C.int(flags))
+	if cErr != C.RD_KAFKA_RESP_ERR_NO_ERROR {
+		return newError(cErr)
+	}
+
+	return nil
+}
+
+// NewProducer creates a new high-level Producer instance.
+//
+// conf is a *ConfigMap with standard librdkafka configuration properties.
+//
+// Supported special configuration properties (type, default):
+//   go.batch.producer (bool, false) - EXPERIMENTAL: Enable batch producer (for increased performance).
+//                                     These batches do not relate to Kafka message batches in any way.
+//                                     Note: timestamps and headers are not supported with this interface.
+//   go.delivery.reports (bool, true) - Forward per-message delivery reports to the
+//                                      Events() channel.
+//   go.delivery.report.fields (string, "key,value") - Comma separated list of fields to enable for delivery reports.
+//                                       Allowed values: all, none (or empty string), key, value, headers
+//                                       Warning: There is a performance penalty to include headers in the delivery report.
+//   go.events.channel.size (int, 1000000) - Events().
+//   go.produce.channel.size (int, 1000000) - ProduceChannel() buffer size (in number of messages)
+//   go.logs.channel.enable (bool, false) - Forward log to Logs() channel.
+//   go.logs.channel (chan kafka.LogEvent, nil) - Forward logs to application-provided channel instead of Logs(). Requires go.logs.channel.enable=true.
+//
+func NewProducer(conf *ConfigMap) (*Producer, error) {
+
+	err := versionCheck()
+	if err != nil {
+		return nil, err
+	}
+
+	p := &Producer{}
+
+	// before we do anything with the configuration, create a copy such that
+	// the original is not mutated.
+	confCopy := conf.clone()
+
+	v, err := confCopy.extract("delivery.report.only.error", false)
+	if v == true {
+		// FIXME: The filtering of successful DRs must be done in
+		//        the Go client to avoid cgoDr memory leaks.
+		return nil, newErrorFromString(ErrUnsupportedFeature,
+			"delivery.report.only.error=true is not currently supported by the Go client")
+	}
+
+	v, err = confCopy.extract("go.batch.producer", false)
+	if err != nil {
+		return nil, err
+	}
+	batchProducer := v.(bool)
+
+	v, err = confCopy.extract("go.delivery.reports", true)
+	if err != nil {
+		return nil, err
+	}
+	p.handle.fwdDr = v.(bool)
+
+	v, err = confCopy.extract("go.delivery.report.fields", "key,value")
+	if err != nil {
+		return nil, err
+	}
+
+	p.handle.msgFields, err = newMessageFieldsFrom(v)
+	if err != nil {
+		return nil, err
+	}
+
+	v, err = confCopy.extract("go.events.channel.size", 1000000)
+	if err != nil {
+		return nil, err
+	}
+	eventsChanSize := v.(int)
+
+	v, err = confCopy.extract("go.produce.channel.size", 1000000)
+	if err != nil {
+		return nil, err
+	}
+	produceChannelSize := v.(int)
+
+	logsChanEnable, logsChan, err := confCopy.extractLogConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	if int(C.rd_kafka_version()) < 0x01000000 {
+		// produce.offset.report is no longer used in librdkafka >= v1.0.0
+		v, _ = confCopy.extract("{topic}.produce.offset.report", nil)
+		if v == nil {
+			// Enable offset reporting by default, unless overriden.
+			confCopy.SetKey("{topic}.produce.offset.report", true)
+		}
+	}
+
+	// Convert ConfigMap to librdkafka conf_t
+	cConf, err := confCopy.convert()
+	if err != nil {
+		return nil, err
+	}
+
+	cErrstr := (*C.char)(C.malloc(C.size_t(256)))
+	defer C.free(unsafe.Pointer(cErrstr))
+
+	C.rd_kafka_conf_set_events(cConf, C.RD_KAFKA_EVENT_DR|C.RD_KAFKA_EVENT_STATS|C.RD_KAFKA_EVENT_ERROR|C.RD_KAFKA_EVENT_OAUTHBEARER_TOKEN_REFRESH)
+
+	// Create librdkafka producer instance
+	p.handle.rk = C.rd_kafka_new(C.RD_KAFKA_PRODUCER, cConf, cErrstr, 256)
+	if p.handle.rk == nil {
+		return nil, newErrorFromCString(C.RD_KAFKA_RESP_ERR__INVALID_ARG, cErrstr)
+	}
+
+	p.handle.p = p
+	p.handle.setup()
+	p.handle.rkq = C.rd_kafka_queue_get_main(p.handle.rk)
+	p.events = make(chan Event, eventsChanSize)
+	p.produceChannel = make(chan *Message, produceChannelSize)
+	p.pollerTermChan = make(chan bool)
+
+	if logsChanEnable {
+		p.handle.setupLogQueue(logsChan, p.pollerTermChan)
+	}
+
+	p.handle.waitGroup.Add(1)
+	go func() {
+		poller(p, p.pollerTermChan)
+		p.handle.waitGroup.Done()
+	}()
+
+	// non-batch or batch producer, only one must be used
+	var producer func(*Producer)
+	if batchProducer {
+		producer = channelBatchProducer
+	} else {
+		producer = channelProducer
+	}
+
+	p.handle.waitGroup.Add(1)
+	go func() {
+		producer(p)
+		p.handle.waitGroup.Done()
+	}()
+
+	return p, nil
+}
+
+// channel_producer serves the ProduceChannel channel
+func channelProducer(p *Producer) {
+	for m := range p.produceChannel {
+		err := p.produce(m, C.RD_KAFKA_MSG_F_BLOCK, nil)
+		if err != nil {
+			m.TopicPartition.Error = err
+			p.events <- m
+		}
+	}
+}
+
+// channelBatchProducer serves the ProduceChannel channel and attempts to
+// improve cgo performance by using the produceBatch() interface.
+func channelBatchProducer(p *Producer) {
+	var buffered = make(map[string][]*Message)
+	bufferedCnt := 0
+	const batchSize int = 1000000
+	totMsgCnt := 0
+	totBatchCnt := 0
+
+	for m := range p.produceChannel {
+		buffered[*m.TopicPartition.Topic] = append(buffered[*m.TopicPartition.Topic], m)
+		bufferedCnt++
+
+	loop2:
+		for true {
+			select {
+			case m, ok := <-p.produceChannel:
+				if !ok {
+					break loop2
+				}
+				if m == nil {
+					panic("nil message received on ProduceChannel")
+				}
+				if m.TopicPartition.Topic == nil {
+					panic(fmt.Sprintf("message without Topic received on ProduceChannel: %v", m))
+				}
+				buffered[*m.TopicPartition.Topic] = append(buffered[*m.TopicPartition.Topic], m)
+				bufferedCnt++
+				if bufferedCnt >= batchSize {
+					break loop2
+				}
+			default:
+				break loop2
+			}
+		}
+
+		totBatchCnt++
+		totMsgCnt += len(buffered)
+
+		for topic, buffered2 := range buffered {
+			err := p.produceBatch(topic, buffered2, C.RD_KAFKA_MSG_F_BLOCK)
+			if err != nil {
+				for _, m = range buffered2 {
+					m.TopicPartition.Error = err
+					p.events <- m
+				}
+			}
+		}
+
+		buffered = make(map[string][]*Message)
+		bufferedCnt = 0
+	}
+}
+
+// poller polls the rd_kafka_t handle for events until signalled for termination
+func poller(p *Producer, termChan chan bool) {
+	for {
+		select {
+		case _ = <-termChan:
+			return
+
+		default:
+			_, term := p.handle.eventPoll(p.events, 100, 1000, termChan)
+			if term {
+				return
+			}
+			break
+		}
+	}
+}
+
+// GetMetadata queries broker for cluster and topic metadata.
+// If topic is non-nil only information about that topic is returned, else if
+// allTopics is false only information about locally used topics is returned,
+// else information about all topics is returned.
+// GetMetadata is equivalent to listTopics, describeTopics and describeCluster in the Java API.
+func (p *Producer) GetMetadata(topic *string, allTopics bool, timeoutMs int) (*Metadata, error) {
+	return getMetadata(p, topic, allTopics, timeoutMs)
+}
+
+// QueryWatermarkOffsets returns the broker's low and high offsets for the given topic
+// and partition.
+func (p *Producer) QueryWatermarkOffsets(topic string, partition int32, timeoutMs int) (low, high int64, err error) {
+	return queryWatermarkOffsets(p, topic, partition, timeoutMs)
+}
+
+// OffsetsForTimes looks up offsets by timestamp for the given partitions.
+//
+// The returned offset for each partition is the earliest offset whose
+// timestamp is greater than or equal to the given timestamp in the
+// corresponding partition. If the provided timestamp exceeds that of the
+// last message in the partition, a value of -1 will be returned.
+//
+// The timestamps to query are represented as `.Offset` in the `times`
+// argument and the looked up offsets are represented as `.Offset` in the returned
+// `offsets` list.
+//
+// The function will block for at most timeoutMs milliseconds.
+//
+// Duplicate Topic+Partitions are not supported.
+// Per-partition errors may be returned in the `.Error` field.
+func (p *Producer) OffsetsForTimes(times []TopicPartition, timeoutMs int) (offsets []TopicPartition, err error) {
+	return offsetsForTimes(p, times, timeoutMs)
+}
+
+// GetFatalError returns an Error object if the client instance has raised a fatal error, else nil.
+func (p *Producer) GetFatalError() error {
+	return getFatalError(p)
+}
+
+// TestFatalError triggers a fatal error in the underlying client.
+// This is to be used strictly for testing purposes.
+func (p *Producer) TestFatalError(code ErrorCode, str string) ErrorCode {
+	return testFatalError(p, code, str)
+}
+
+// SetOAuthBearerToken sets the the data to be transmitted
+// to a broker during SASL/OAUTHBEARER authentication. It will return nil
+// on success, otherwise an error if:
+// 1) the token data is invalid (meaning an expiration time in the past
+// or either a token value or an extension key or value that does not meet
+// the regular expression requirements as per
+// https://tools.ietf.org/html/rfc7628#section-3.1);
+// 2) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+// 3) SASL/OAUTHBEARER is supported but is not configured as the client's
+// authentication mechanism.
+func (p *Producer) SetOAuthBearerToken(oauthBearerToken OAuthBearerToken) error {
+	return p.handle.setOAuthBearerToken(oauthBearerToken)
+}
+
+// SetOAuthBearerTokenFailure sets the error message describing why token
+// retrieval/setting failed; it also schedules a new token refresh event for 10
+// seconds later so the attempt may be retried. It will return nil on
+// success, otherwise an error if:
+// 1) SASL/OAUTHBEARER is not supported by the underlying librdkafka build;
+// 2) SASL/OAUTHBEARER is supported but is not configured as the client's
+// authentication mechanism.
+func (p *Producer) SetOAuthBearerTokenFailure(errstr string) error {
+	return p.handle.setOAuthBearerTokenFailure(errstr)
+}
+
+// Transactional API
+
+// InitTransactions Initializes transactions for the producer instance.
+//
+// This function ensures any transactions initiated by previous instances
+// of the producer with the same `transactional.id` are completed.
+// If the previous instance failed with a transaction in progress the
+// previous transaction will be aborted.
+// This function needs to be called before any other transactional or
+// produce functions are called when the `transactional.id` is configured.
+//
+// If the last transaction had begun completion (following transaction commit)
+// but not yet finished, this function will await the previous transaction's
+// completion.
+//
+// When any previous transactions have been fenced this function
+// will acquire the internal producer id and epoch, used in all future
+// transactional messages issued by this producer instance.
+//
+// Upon successful return from this function the application has to perform at
+// least one of the following operations within `transaction.timeout.ms` to
+// avoid timing out the transaction on the broker:
+//  * `Produce()` (et.al)
+//  * `SendOffsetsToTransaction()`
+//  * `CommitTransaction()`
+//  * `AbortTransaction()`
+//
+// Parameters:
+//  * `ctx` - The maximum time to block, or nil for indefinite.
+//            On timeout the operation may continue in the background,
+//            depending on state, and it is okay to call `InitTransactions()`
+//            again.
+//
+// Returns nil on success or an error on failure.
+// Check whether the returned error object permits retrying
+// by calling `err.(kafka.Error).IsRetriable()`, or whether a fatal
+// error has been raised by calling `err.(kafka.Error).IsFatal()`.
+func (p *Producer) InitTransactions(ctx context.Context) error {
+	cError := C.rd_kafka_init_transactions(p.handle.rk,
+		cTimeoutFromContext(ctx))
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// BeginTransaction starts a new transaction.
+//
+// `InitTransactions()` must have been called successfully (once)
+// before this function is called.
+//
+// Any messages produced, offsets sent (`SendOffsetsToTransaction()`),
+// etc, after the successful return of this function will be part of
+// the transaction and committed or aborted atomatically.
+//
+// Finish the transaction by calling `CommitTransaction()` or
+// abort the transaction by calling `AbortTransaction()`.
+//
+// Returns nil on success or an error object on failure.
+// Check whether a fatal error has been raised by
+// calling `err.(kafka.Error).IsFatal()`.
+//
+// Note: With the transactional producer, `Produce()`, et.al, are only
+// allowed during an on-going transaction, as started with this function.
+// Any produce call outside an on-going transaction, or for a failed
+// transaction, will fail.
+func (p *Producer) BeginTransaction() error {
+	cError := C.rd_kafka_begin_transaction(p.handle.rk)
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// SendOffsetsToTransaction sends a list of topic partition offsets to the
+// consumer group coordinator for `consumerMetadata`, and marks the offsets
+// as part part of the current transaction.
+// These offsets will be considered committed only if the transaction is
+// committed successfully.
+//
+// The offsets should be the next message your application will consume,
+// i.e., the last processed message's offset + 1 for each partition.
+// Either track the offsets manually during processing or use
+// `consumer.Position()` (on the consumer) to get the current offsets for
+// the partitions assigned to the consumer.
+//
+// Use this method at the end of a consume-transform-produce loop prior
+// to committing the transaction with `CommitTransaction()`.
+//
+// Parameters:
+//  * `ctx` - The maximum amount of time to block, or nil for indefinite.
+//  * `offsets` - List of offsets to commit to the consumer group upon
+//                successful commit of the transaction. Offsets should be
+//                the next message to consume, e.g., last processed message + 1.
+//  * `consumerMetadata` - The current consumer group metadata as returned by
+//                `consumer.GetConsumerGroupMetadata()` on the consumer
+//                instance the provided offsets were consumed from.
+//
+// Note: The consumer must disable auto commits (set `enable.auto.commit` to false on the consumer).
+//
+// Note: Logical and invalid offsets (e.g., OffsetInvalid) in
+// `offsets` will be ignored. If there are no valid offsets in
+// `offsets` the function will return nil and no action will be taken.
+//
+// Returns nil on success or an error object on failure.
+// Check whether the returned error object permits retrying
+// by calling `err.(kafka.Error).IsRetriable()`, or whether an abortable
+// or fatal error has been raised by calling
+// `err.(kafka.Error).TxnRequiresAbort()` or `err.(kafka.Error).IsFatal()`
+// respectively.
+func (p *Producer) SendOffsetsToTransaction(ctx context.Context, offsets []TopicPartition, consumerMetadata *ConsumerGroupMetadata) error {
+	var cOffsets *C.rd_kafka_topic_partition_list_t
+	if offsets != nil {
+		cOffsets = newCPartsFromTopicPartitions(offsets)
+		defer C.rd_kafka_topic_partition_list_destroy(cOffsets)
+	}
+
+	cgmd, err := deserializeConsumerGroupMetadata(consumerMetadata.serialized)
+	if err != nil {
+		return err
+	}
+	defer C.rd_kafka_consumer_group_metadata_destroy(cgmd)
+
+	cError := C.rd_kafka_send_offsets_to_transaction(
+		p.handle.rk,
+		cOffsets,
+		cgmd,
+		cTimeoutFromContext(ctx))
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// CommitTransaction commits the current transaction.
+//
+// Any outstanding messages will be flushed (delivered) before actually
+// committing the transaction.
+//
+// If any of the outstanding messages fail permanently the current
+// transaction will enter the abortable error state and this
+// function will return an abortable error, in this case the application
+// must call `AbortTransaction()` before attempting a new
+// transaction with `BeginTransaction()`.
+//
+// Parameters:
+//  * `ctx` - The maximum amount of time to block, or nil for indefinite.
+//
+// Note: This function will block until all outstanding messages are
+// delivered and the transaction commit request has been successfully
+// handled by the transaction coordinator, or until the `ctx` expires,
+// which ever comes first. On timeout the application may
+// call the function again.
+//
+// Note: Will automatically call `Flush()` to ensure all queued
+// messages are delivered before attempting to commit the transaction.
+// The application MUST serve the `producer.Events()` channel for delivery
+// reports in a separate go-routine during this time.
+//
+// Returns nil on success or an error object on failure.
+// Check whether the returned error object permits retrying
+// by calling `err.(kafka.Error).IsRetriable()`, or whether an abortable
+// or fatal error has been raised by calling
+// `err.(kafka.Error).TxnRequiresAbort()` or `err.(kafka.Error).IsFatal()`
+// respectively.
+func (p *Producer) CommitTransaction(ctx context.Context) error {
+	cError := C.rd_kafka_commit_transaction(p.handle.rk,
+		cTimeoutFromContext(ctx))
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}
+
+// AbortTransaction aborts the ongoing transaction.
+//
+// This function should also be used to recover from non-fatal abortable
+// transaction errors.
+//
+// Any outstanding messages will be purged and fail with
+// `ErrPurgeInflight` or `ErrPurgeQueue`.
+//
+// Parameters:
+//  * `ctx` - The maximum amount of time to block, or nil for indefinite.
+//
+// Note: This function will block until all outstanding messages are purged
+// and the transaction abort request has been successfully
+// handled by the transaction coordinator, or until the `ctx` expires,
+// which ever comes first. On timeout the application may
+// call the function again.
+//
+// Note: Will automatically call `Purge()` and `Flush()` to ensure all queued
+// and in-flight messages are purged before attempting to abort the transaction.
+// The application MUST serve the `producer.Events()` channel for delivery
+// reports in a separate go-routine during this time.
+//
+// Returns nil on success or an error object on failure.
+// Check whether the returned error object permits retrying
+// by calling `err.(kafka.Error).IsRetriable()`, or whether a fatal error
+// has been raised by calling `err.(kafka.Error).IsFatal()`.
+func (p *Producer) AbortTransaction(ctx context.Context) error {
+	cError := C.rd_kafka_abort_transaction(p.handle.rk,
+		cTimeoutFromContext(ctx))
+	if cError != nil {
+		return newErrorFromCErrorDestroy(cError)
+	}
+
+	return nil
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/select_rdkafka.h

@@ -0,0 +1,29 @@
+/**
+ * Copyright 2020 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This file uses a preprocessor macro defined by the various build_*.go
+// files to determine whether to import the bundled librdkafka header, or
+// the system one.
+// This is needed because cgo will automatically add -I. to the include
+// path, so <librdkafka/rdkafka.h> would find a bundled header instead of
+// the system one if it were called librdkafka/rdkafka.h instead of
+// librdkafka_vendor/rdkafka.h
+
+#ifdef USE_VENDORED_LIBRDKAFKA
+#include "librdkafka_vendor/rdkafka.h"
+#else
+#include <librdkafka/rdkafka.h>
+#endif

vendor/github.com/confluentinc/confluent-kafka-go/kafka/testconf-example.json

@@ -0,0 +1,8 @@
+{
+    "Brokers": "mybroker or $BROKERS env",
+    "Topic": "test",
+    "GroupID": "testgroup",
+    "PerfMsgCount": 1000000,
+    "PerfMsgSize": 100,
+    "Config": ["api.version.request=true"]
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/testhelpers.go

@@ -0,0 +1,248 @@
+package kafka
+
+/**
+ * Copyright 2016 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"math/rand"
+	"os"
+	"testing"
+	"time"
+)
+
+/*
+#include "select_rdkafka.h"
+*/
+import "C"
+
+var testconf struct {
+	Brokers      string
+	Topic        string
+	GroupID      string
+	PerfMsgCount int
+	PerfMsgSize  int
+	Config       []string
+	conf         ConfigMap
+}
+
+// testconf_read reads the test suite config file testconf.json which must
+// contain at least Brokers and Topic string properties.
+// Returns true if the testconf was found and usable, false if no such file, or panics
+// if the file format is wrong.
+func testconfRead() bool {
+	cf, err := os.Open("testconf.json")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%% testconf.json not found - ignoring test\n")
+		return false
+	}
+
+	// Default values
+	testconf.PerfMsgCount = 2000000
+	testconf.PerfMsgSize = 100
+	testconf.GroupID = "testgroup"
+
+	jp := json.NewDecoder(cf)
+	err = jp.Decode(&testconf)
+	if err != nil {
+		panic(fmt.Sprintf("Failed to parse testconf: %s", err))
+	}
+
+	cf.Close()
+
+	if testconf.Brokers[0] == '$' {
+		// Read broker list from environment variable
+		testconf.Brokers = os.Getenv(testconf.Brokers[1:])
+	}
+
+	if testconf.Brokers == "" || testconf.Topic == "" {
+		panic("Missing Brokers or Topic in testconf.json")
+	}
+
+	return true
+}
+
+// update existing ConfigMap with key=value pairs from testconf.Config
+func (cm *ConfigMap) updateFromTestconf() error {
+	if testconf.Config == nil {
+		return nil
+	}
+
+	// Translate "key=value" pairs in Config to ConfigMap
+	for _, s := range testconf.Config {
+		err := cm.Set(s)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+
+}
+
+// Return the number of messages available in all partitions of a topic.
+// WARNING: This uses watermark offsets so it will be incorrect for compacted topics.
+func getMessageCountInTopic(topic string) (int, error) {
+
+	// Create consumer
+	config := &ConfigMap{"bootstrap.servers": testconf.Brokers,
+		"group.id": testconf.GroupID}
+	config.updateFromTestconf()
+
+	c, err := NewConsumer(config)
+	if err != nil {
+		return 0, err
+	}
+	defer c.Close()
+
+	// get metadata for the topic to find out number of partitions
+
+	metadata, err := c.GetMetadata(&topic, false, 5*1000)
+	if err != nil {
+		return 0, err
+	}
+
+	t, ok := metadata.Topics[topic]
+	if !ok {
+		return 0, newError(C.RD_KAFKA_RESP_ERR__UNKNOWN_TOPIC)
+	}
+
+	cnt := 0
+	for _, p := range t.Partitions {
+		low, high, err := c.QueryWatermarkOffsets(topic, p.ID, 5*1000)
+		if err != nil {
+			continue
+		}
+		cnt += int(high - low)
+	}
+
+	return cnt, nil
+}
+
+// getBrokerList returns a list of brokers (ids) in the cluster
+func getBrokerList(H Handle) (brokers []int32, err error) {
+	md, err := getMetadata(H, nil, true, 15*1000)
+	if err != nil {
+		return nil, err
+	}
+
+	brokers = make([]int32, len(md.Brokers))
+	for i, mdBroker := range md.Brokers {
+		brokers[i] = mdBroker.ID
+	}
+
+	return brokers, nil
+}
+
+// waitTopicInMetadata waits for the given topic to show up in metadata
+func waitTopicInMetadata(H Handle, topic string, timeoutMs int) error {
+	d, _ := time.ParseDuration(fmt.Sprintf("%dms", timeoutMs))
+	tEnd := time.Now().Add(d)
+
+	for {
+		remain := tEnd.Sub(time.Now()).Seconds()
+		if remain < 0.0 {
+			return newErrorFromString(ErrTimedOut,
+				fmt.Sprintf("Timed out waiting for topic %s to appear in metadata", topic))
+		}
+
+		md, err := getMetadata(H, nil, true, int(remain*1000))
+		if err != nil {
+			return err
+		}
+
+		for _, t := range md.Topics {
+			if t.Topic != topic {
+				continue
+			}
+			if t.Error.Code() != ErrNoError || len(t.Partitions) < 1 {
+				continue
+			}
+			// Proper topic found in metadata
+			return nil
+		}
+
+		time.Sleep(500 * 1000) // 500ms
+	}
+
+}
+
+func createAdminClient(t *testing.T) (a *AdminClient) {
+	numver, strver := LibraryVersion()
+	if numver < 0x000b0500 {
+		t.Skipf("Requires librdkafka >=0.11.5 (currently on %s, 0x%x)", strver, numver)
+	}
+
+	if !testconfRead() {
+		t.Skipf("Missing testconf.json")
+	}
+
+	conf := ConfigMap{"bootstrap.servers": testconf.Brokers}
+	conf.updateFromTestconf()
+
+	/*
+	 * Create producer and produce a couple of messages with and without
+	 * headers.
+	 */
+	a, err := NewAdminClient(&conf)
+	if err != nil {
+		t.Fatalf("NewAdminClient: %v", err)
+	}
+
+	return a
+}
+
+func createTestTopic(t *testing.T, suffix string, numPartitions int, replicationFactor int) string {
+	rand.Seed(time.Now().Unix())
+
+	topic := fmt.Sprintf("%s-%s-%d", testconf.Topic, suffix, rand.Intn(100000))
+
+	a := createAdminClient(t)
+	defer a.Close()
+
+	newTopics := []TopicSpecification{
+		{
+			Topic:             topic,
+			NumPartitions:     numPartitions,
+			ReplicationFactor: replicationFactor,
+		},
+	}
+
+	maxDuration, err := time.ParseDuration("30s")
+	if err != nil {
+		t.Fatalf("%s", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), maxDuration)
+	defer cancel()
+	result, err := a.CreateTopics(ctx, newTopics, nil)
+	if err != nil {
+		t.Fatalf("CreateTopics() failed: %s", err)
+	}
+
+	for _, res := range result {
+		if res.Error.Code() != ErrNoError {
+			t.Errorf("Failed to create topic %s: %s\n",
+				res.Topic, res.Error)
+			continue
+		}
+
+	}
+
+	return topic
+}

vendor/github.com/confluentinc/confluent-kafka-go/kafka/time.go

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2019 Confluent Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package kafka
+
+import "C"
+
+import (
+	"context"
+	"time"
+)
+
+const (
+	cTimeoutInfinite = C.int(-1) // Blocks indefinitely until completion.
+	cTimeoutNoWait   = C.int(0)  // Returns immediately without blocking.
+)
+
+// cTimeoutFromContext returns the remaining time after which work done on behalf of this context
+// should be canceled, in milliseconds.
+//
+// If no deadline/timeout is set, or if the timeout does not fit in an int32, it returns
+// cTimeoutInfinite;
+// If there is no time left in this context, it returns cTimeoutNoWait.
+func cTimeoutFromContext(ctx context.Context) C.int {
+	if ctx == nil {
+		return cTimeoutInfinite
+	}
+	timeout, hasTimeout := timeout(ctx)
+	if !hasTimeout {
+		return cTimeoutInfinite
+	}
+	if timeout <= 0 {
+		return cTimeoutNoWait
+	}
+
+	timeoutMs := int64(timeout / time.Millisecond)
+	if int64(int32(timeoutMs)) < timeoutMs {
+		return cTimeoutInfinite
+	}
+
+	return C.int(timeoutMs)
+}

vendor/github.com/go-stack/stack/LICENSE.md

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Chris Hines
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/go-stack/stack/README.md

@@ -0,0 +1,38 @@
+[![GoDoc](https://godoc.org/github.com/go-stack/stack?status.svg)](https://godoc.org/github.com/go-stack/stack)
+[![Go Report Card](https://goreportcard.com/badge/go-stack/stack)](https://goreportcard.com/report/go-stack/stack)
+[![TravisCI](https://travis-ci.org/go-stack/stack.svg?branch=master)](https://travis-ci.org/go-stack/stack)
+[![Coverage Status](https://coveralls.io/repos/github/go-stack/stack/badge.svg?branch=master)](https://coveralls.io/github/go-stack/stack?branch=master)
+
+# stack
+
+Package stack implements utilities to capture, manipulate, and format call
+stacks. It provides a simpler API than package runtime.
+
+The implementation takes care of the minutia and special cases of interpreting
+the program counter (pc) values returned by runtime.Callers.
+
+## Versioning
+
+Package stack publishes releases via [semver](http://semver.org/) compatible Git
+tags prefixed with a single 'v'. The master branch always contains the latest
+release. The develop branch contains unreleased commits.
+
+## Formatting
+
+Package stack's types implement fmt.Formatter, which provides a simple and
+flexible way to declaratively configure formatting when used with logging or
+error tracking packages.
+
+```go
+func DoTheThing() {
+    c := stack.Caller(0)
+    log.Print(c)          // "source.go:10"
+    log.Printf("%+v", c)  // "pkg/path/source.go:10"
+    log.Printf("%n", c)   // "DoTheThing"
+
+    s := stack.Trace().TrimRuntime()
+    log.Print(s)          // "[source.go:15 caller.go:42 main.go:14]"
+}
+```
+
+See the docs for all of the supported formatting options.

vendor/github.com/go-stack/stack/stack.go

@@ -0,0 +1,400 @@
+// +build go1.7
+
+// Package stack implements utilities to capture, manipulate, and format call
+// stacks. It provides a simpler API than package runtime.
+//
+// The implementation takes care of the minutia and special cases of
+// interpreting the program counter (pc) values returned by runtime.Callers.
+//
+// Package stack's types implement fmt.Formatter, which provides a simple and
+// flexible way to declaratively configure formatting when used with logging
+// or error tracking packages.
+package stack
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+// Call records a single function invocation from a goroutine stack.
+type Call struct {
+	frame runtime.Frame
+}
+
+// Caller returns a Call from the stack of the current goroutine. The argument
+// skip is the number of stack frames to ascend, with 0 identifying the
+// calling function.
+func Caller(skip int) Call {
+	// As of Go 1.9 we need room for up to three PC entries.
+	//
+	// 0. An entry for the stack frame prior to the target to check for
+	//    special handling needed if that prior entry is runtime.sigpanic.
+	// 1. A possible second entry to hold metadata about skipped inlined
+	//    functions. If inline functions were not skipped the target frame
+	//    PC will be here.
+	// 2. A third entry for the target frame PC when the second entry
+	//    is used for skipped inline functions.
+	var pcs [3]uintptr
+	n := runtime.Callers(skip+1, pcs[:])
+	frames := runtime.CallersFrames(pcs[:n])
+	frame, _ := frames.Next()
+	frame, _ = frames.Next()
+
+	return Call{
+		frame: frame,
+	}
+}
+
+// String implements fmt.Stinger. It is equivalent to fmt.Sprintf("%v", c).
+func (c Call) String() string {
+	return fmt.Sprint(c)
+}
+
+// MarshalText implements encoding.TextMarshaler. It formats the Call the same
+// as fmt.Sprintf("%v", c).
+func (c Call) MarshalText() ([]byte, error) {
+	if c.frame == (runtime.Frame{}) {
+		return nil, ErrNoFunc
+	}
+
+	buf := bytes.Buffer{}
+	fmt.Fprint(&buf, c)
+	return buf.Bytes(), nil
+}
+
+// ErrNoFunc means that the Call has a nil *runtime.Func. The most likely
+// cause is a Call with the zero value.
+var ErrNoFunc = errors.New("no call stack information")
+
+// Format implements fmt.Formatter with support for the following verbs.
+//
+//    %s    source file
+//    %d    line number
+//    %n    function name
+//    %k    last segment of the package path
+//    %v    equivalent to %s:%d
+//
+// It accepts the '+' and '#' flags for most of the verbs as follows.
+//
+//    %+s   path of source file relative to the compile time GOPATH,
+//          or the module path joined to the path of source file relative
+//          to module root
+//    %#s   full path of source file
+//    %+n   import path qualified function name
+//    %+k   full package path
+//    %+v   equivalent to %+s:%d
+//    %#v   equivalent to %#s:%d
+func (c Call) Format(s fmt.State, verb rune) {
+	if c.frame == (runtime.Frame{}) {
+		fmt.Fprintf(s, "%%!%c(NOFUNC)", verb)
+		return
+	}
+
+	switch verb {
+	case 's', 'v':
+		file := c.frame.File
+		switch {
+		case s.Flag('#'):
+			// done
+		case s.Flag('+'):
+			file = pkgFilePath(&c.frame)
+		default:
+			const sep = "/"
+			if i := strings.LastIndex(file, sep); i != -1 {
+				file = file[i+len(sep):]
+			}
+		}
+		io.WriteString(s, file)
+		if verb == 'v' {
+			buf := [7]byte{':'}
+			s.Write(strconv.AppendInt(buf[:1], int64(c.frame.Line), 10))
+		}
+
+	case 'd':
+		buf := [6]byte{}
+		s.Write(strconv.AppendInt(buf[:0], int64(c.frame.Line), 10))
+
+	case 'k':
+		name := c.frame.Function
+		const pathSep = "/"
+		start, end := 0, len(name)
+		if i := strings.LastIndex(name, pathSep); i != -1 {
+			start = i + len(pathSep)
+		}
+		const pkgSep = "."
+		if i := strings.Index(name[start:], pkgSep); i != -1 {
+			end = start + i
+		}
+		if s.Flag('+') {
+			start = 0
+		}
+		io.WriteString(s, name[start:end])
+
+	case 'n':
+		name := c.frame.Function
+		if !s.Flag('+') {
+			const pathSep = "/"
+			if i := strings.LastIndex(name, pathSep); i != -1 {
+				name = name[i+len(pathSep):]
+			}
+			const pkgSep = "."
+			if i := strings.Index(name, pkgSep); i != -1 {
+				name = name[i+len(pkgSep):]
+			}
+		}
+		io.WriteString(s, name)
+	}
+}
+
+// Frame returns the call frame infomation for the Call.
+func (c Call) Frame() runtime.Frame {
+	return c.frame
+}
+
+// PC returns the program counter for this call frame; multiple frames may
+// have the same PC value.
+//
+// Deprecated: Use Call.Frame instead.
+func (c Call) PC() uintptr {
+	return c.frame.PC
+}
+
+// CallStack records a sequence of function invocations from a goroutine
+// stack.
+type CallStack []Call
+
+// String implements fmt.Stinger. It is equivalent to fmt.Sprintf("%v", cs).
+func (cs CallStack) String() string {
+	return fmt.Sprint(cs)
+}
+
+var (
+	openBracketBytes  = []byte("[")
+	closeBracketBytes = []byte("]")
+	spaceBytes        = []byte(" ")
+)
+
+// MarshalText implements encoding.TextMarshaler. It formats the CallStack the
+// same as fmt.Sprintf("%v", cs).
+func (cs CallStack) MarshalText() ([]byte, error) {
+	buf := bytes.Buffer{}
+	buf.Write(openBracketBytes)
+	for i, pc := range cs {
+		if i > 0 {
+			buf.Write(spaceBytes)
+		}
+		fmt.Fprint(&buf, pc)
+	}
+	buf.Write(closeBracketBytes)
+	return buf.Bytes(), nil
+}
+
+// Format implements fmt.Formatter by printing the CallStack as square brackets
+// ([, ]) surrounding a space separated list of Calls each formatted with the
+// supplied verb and options.
+func (cs CallStack) Format(s fmt.State, verb rune) {
+	s.Write(openBracketBytes)
+	for i, pc := range cs {
+		if i > 0 {
+			s.Write(spaceBytes)
+		}
+		pc.Format(s, verb)
+	}
+	s.Write(closeBracketBytes)
+}
+
+// Trace returns a CallStack for the current goroutine with element 0
+// identifying the calling function.
+func Trace() CallStack {
+	var pcs [512]uintptr
+	n := runtime.Callers(1, pcs[:])
+
+	frames := runtime.CallersFrames(pcs[:n])
+	cs := make(CallStack, 0, n)
+
+	// Skip extra frame retrieved just to make sure the runtime.sigpanic
+	// special case is handled.
+	frame, more := frames.Next()
+
+	for more {
+		frame, more = frames.Next()
+		cs = append(cs, Call{frame: frame})
+	}
+
+	return cs
+}
+
+// TrimBelow returns a slice of the CallStack with all entries below c
+// removed.
+func (cs CallStack) TrimBelow(c Call) CallStack {
+	for len(cs) > 0 && cs[0] != c {
+		cs = cs[1:]
+	}
+	return cs
+}
+
+// TrimAbove returns a slice of the CallStack with all entries above c
+// removed.
+func (cs CallStack) TrimAbove(c Call) CallStack {
+	for len(cs) > 0 && cs[len(cs)-1] != c {
+		cs = cs[:len(cs)-1]
+	}
+	return cs
+}
+
+// pkgIndex returns the index that results in file[index:] being the path of
+// file relative to the compile time GOPATH, and file[:index] being the
+// $GOPATH/src/ portion of file. funcName must be the name of a function in
+// file as returned by runtime.Func.Name.
+func pkgIndex(file, funcName string) int {
+	// As of Go 1.6.2 there is no direct way to know the compile time GOPATH
+	// at runtime, but we can infer the number of path segments in the GOPATH.
+	// We note that runtime.Func.Name() returns the function name qualified by
+	// the import path, which does not include the GOPATH. Thus we can trim
+	// segments from the beginning of the file path until the number of path
+	// separators remaining is one more than the number of path separators in
+	// the function name. For example, given:
+	//
+	//    GOPATH     /home/user
+	//    file       /home/user/src/pkg/sub/file.go
+	//    fn.Name()  pkg/sub.Type.Method
+	//
+	// We want to produce:
+	//
+	//    file[:idx] == /home/user/src/
+	//    file[idx:] == pkg/sub/file.go
+	//
+	// From this we can easily see that fn.Name() has one less path separator
+	// than our desired result for file[idx:]. We count separators from the
+	// end of the file path until it finds two more than in the function name
+	// and then move one character forward to preserve the initial path
+	// segment without a leading separator.
+	const sep = "/"
+	i := len(file)
+	for n := strings.Count(funcName, sep) + 2; n > 0; n-- {
+		i = strings.LastIndex(file[:i], sep)
+		if i == -1 {
+			i = -len(sep)
+			break
+		}
+	}
+	// get back to 0 or trim the leading separator
+	return i + len(sep)
+}
+
+// pkgFilePath returns the frame's filepath relative to the compile-time GOPATH,
+// or its module path joined to its path relative to the module root.
+//
+// As of Go 1.11 there is no direct way to know the compile time GOPATH or
+// module paths at runtime, but we can piece together the desired information
+// from available information. We note that runtime.Frame.Function contains the
+// function name qualified by the package path, which includes the module path
+// but not the GOPATH. We can extract the package path from that and append the
+// last segments of the file path to arrive at the desired package qualified
+// file path. For example, given:
+//
+//    GOPATH          /home/user
+//    import path     pkg/sub
+//    frame.File      /home/user/src/pkg/sub/file.go
+//    frame.Function  pkg/sub.Type.Method
+//    Desired return  pkg/sub/file.go
+//
+// It appears that we simply need to trim ".Type.Method" from frame.Function and
+// append "/" + path.Base(file).
+//
+// But there are other wrinkles. Although it is idiomatic to do so, the internal
+// name of a package is not required to match the last segment of its import
+// path. In addition, the introduction of modules in Go 1.11 allows working
+// without a GOPATH. So we also must make these work right:
+//
+//    GOPATH          /home/user
+//    import path     pkg/go-sub
+//    package name    sub
+//    frame.File      /home/user/src/pkg/go-sub/file.go
+//    frame.Function  pkg/sub.Type.Method
+//    Desired return  pkg/go-sub/file.go
+//
+//    Module path     pkg/v2
+//    import path     pkg/v2/go-sub
+//    package name    sub
+//    frame.File      /home/user/cloned-pkg/go-sub/file.go
+//    frame.Function  pkg/v2/sub.Type.Method
+//    Desired return  pkg/v2/go-sub/file.go
+//
+// We can handle all of these situations by using the package path extracted
+// from frame.Function up to, but not including, the last segment as the prefix
+// and the last two segments of frame.File as the suffix of the returned path.
+// This preserves the existing behavior when working in a GOPATH without modules
+// and a semantically equivalent behavior when used in module aware project.
+func pkgFilePath(frame *runtime.Frame) string {
+	pre := pkgPrefix(frame.Function)
+	post := pathSuffix(frame.File)
+	if pre == "" {
+		return post
+	}
+	return pre + "/" + post
+}
+
+// pkgPrefix returns the import path of the function's package with the final
+// segment removed.
+func pkgPrefix(funcName string) string {
+	const pathSep = "/"
+	end := strings.LastIndex(funcName, pathSep)
+	if end == -1 {
+		return ""
+	}
+	return funcName[:end]
+}
+
+// pathSuffix returns the last two segments of path.
+func pathSuffix(path string) string {
+	const pathSep = "/"
+	lastSep := strings.LastIndex(path, pathSep)
+	if lastSep == -1 {
+		return path
+	}
+	return path[strings.LastIndex(path[:lastSep], pathSep)+1:]
+}
+
+var runtimePath string
+
+func init() {
+	var pcs [3]uintptr
+	runtime.Callers(0, pcs[:])
+	frames := runtime.CallersFrames(pcs[:])
+	frame, _ := frames.Next()
+	file := frame.File
+
+	idx := pkgIndex(frame.File, frame.Function)
+
+	runtimePath = file[:idx]
+	if runtime.GOOS == "windows" {
+		runtimePath = strings.ToLower(runtimePath)
+	}
+}
+
+func inGoroot(c Call) bool {
+	file := c.frame.File
+	if len(file) == 0 || file[0] == '?' {
+		return true
+	}
+	if runtime.GOOS == "windows" {
+		file = strings.ToLower(file)
+	}
+	return strings.HasPrefix(file, runtimePath) || strings.HasSuffix(file, "/_testmain.go")
+}
+
+// TrimRuntime returns a slice of the CallStack with the topmost entries from
+// the go runtime removed. It considers any calls originating from unknown
+// files, files under GOROOT, or _testmain.go as part of the runtime.
+func (cs CallStack) TrimRuntime() CallStack {
+	for len(cs) > 0 && inGoroot(cs[len(cs)-1]) {
+		cs = cs[:len(cs)-1]
+	}
+	return cs
+}

vendor/github.com/golang/snappy/.gitignore

@@ -0,0 +1,16 @@
+cmd/snappytool/snappytool
+testdata/bench
+
+# These explicitly listed benchmark data files are for an obsolete version of
+# snappy_test.go.
+testdata/alice29.txt
+testdata/asyoulik.txt
+testdata/fireworks.jpeg
+testdata/geo.protodata
+testdata/html
+testdata/html_x_4
+testdata/kppkn.gtb
+testdata/lcet10.txt
+testdata/paper-100k.pdf
+testdata/plrabn12.txt
+testdata/urls.10K

vendor/github.com/golang/snappy/AUTHORS

@@ -0,0 +1,18 @@
+# This is the official list of Snappy-Go authors for copyright purposes.
+# This file is distinct from the CONTRIBUTORS files.
+# See the latter for an explanation.
+
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# Please keep the list sorted.
+
+Amazon.com, Inc
+Damian Gryski <dgryski@gmail.com>
+Eric Buth <eric@topos.com>
+Google Inc.
+Jan Mercl <0xjnml@gmail.com>
+Klaus Post <klauspost@gmail.com>
+Rodolfo Carvalho <rhcarvalho@gmail.com>
+Sebastien Binet <seb.binet@gmail.com>

vendor/github.com/golang/snappy/CONTRIBUTORS

@@ -0,0 +1,41 @@
+# This is the official list of people who can contribute
+# (and typically have contributed) code to the Snappy-Go repository.
+# The AUTHORS file lists the copyright holders; this file
+# lists people.  For example, Google employees are listed here
+# but not in AUTHORS, because Google holds the copyright.
+#
+# The submission process automatically checks to make sure
+# that people submitting code are listed in this file (by email address).
+#
+# Names should be added to this file only after verifying that
+# the individual or the individual's organization has agreed to
+# the appropriate Contributor License Agreement, found here:
+#
+#     http://code.google.com/legal/individual-cla-v1.0.html
+#     http://code.google.com/legal/corporate-cla-v1.0.html
+#
+# The agreement for individuals can be filled out on the web.
+#
+# When adding J Random Contributor's name to this file,
+# either J's name or J's organization's name should be
+# added to the AUTHORS file, depending on whether the
+# individual or corporate CLA was used.
+
+# Names should be added to this file like so:
+#     Name <email address>
+
+# Please keep the list sorted.
+
+Alex Legg <alexlegg@google.com>
+Damian Gryski <dgryski@gmail.com>
+Eric Buth <eric@topos.com>
+Jan Mercl <0xjnml@gmail.com>
+Jonathan Swinney <jswinney@amazon.com>
+Kai Backman <kaib@golang.org>
+Klaus Post <klauspost@gmail.com>
+Marc-Antoine Ruel <maruel@chromium.org>
+Nigel Tao <nigeltao@golang.org>
+Rob Pike <r@golang.org>
+Rodolfo Carvalho <rhcarvalho@gmail.com>
+Russ Cox <rsc@golang.org>
+Sebastien Binet <seb.binet@gmail.com>

vendor/github.com/golang/snappy/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2011 The Snappy-Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/golang/snappy/README

@@ -0,0 +1,107 @@
+The Snappy compression format in the Go programming language.
+
+To download and install from source:
+$ go get github.com/golang/snappy
+
+Unless otherwise noted, the Snappy-Go source files are distributed
+under the BSD-style license found in the LICENSE file.
+
+
+
+Benchmarks.
+
+The golang/snappy benchmarks include compressing (Z) and decompressing (U) ten
+or so files, the same set used by the C++ Snappy code (github.com/google/snappy
+and note the "google", not "golang"). On an "Intel(R) Core(TM) i7-3770 CPU @
+3.40GHz", Go's GOARCH=amd64 numbers as of 2016-05-29:
+
+"go test -test.bench=."
+
+_UFlat0-8         2.19GB/s ± 0%  html
+_UFlat1-8         1.41GB/s ± 0%  urls
+_UFlat2-8         23.5GB/s ± 2%  jpg
+_UFlat3-8         1.91GB/s ± 0%  jpg_200
+_UFlat4-8         14.0GB/s ± 1%  pdf
+_UFlat5-8         1.97GB/s ± 0%  html4
+_UFlat6-8          814MB/s ± 0%  txt1
+_UFlat7-8          785MB/s ± 0%  txt2
+_UFlat8-8          857MB/s ± 0%  txt3
+_UFlat9-8          719MB/s ± 1%  txt4
+_UFlat10-8        2.84GB/s ± 0%  pb
+_UFlat11-8        1.05GB/s ± 0%  gaviota
+
+_ZFlat0-8         1.04GB/s ± 0%  html
+_ZFlat1-8          534MB/s ± 0%  urls
+_ZFlat2-8         15.7GB/s ± 1%  jpg
+_ZFlat3-8          740MB/s ± 3%  jpg_200
+_ZFlat4-8         9.20GB/s ± 1%  pdf
+_ZFlat5-8          991MB/s ± 0%  html4
+_ZFlat6-8          379MB/s ± 0%  txt1
+_ZFlat7-8          352MB/s ± 0%  txt2
+_ZFlat8-8          396MB/s ± 1%  txt3
+_ZFlat9-8          327MB/s ± 1%  txt4
+_ZFlat10-8        1.33GB/s ± 1%  pb
+_ZFlat11-8         605MB/s ± 1%  gaviota
+
+
+
+"go test -test.bench=. -tags=noasm"
+
+_UFlat0-8          621MB/s ± 2%  html
+_UFlat1-8          494MB/s ± 1%  urls
+_UFlat2-8         23.2GB/s ± 1%  jpg
+_UFlat3-8         1.12GB/s ± 1%  jpg_200
+_UFlat4-8         4.35GB/s ± 1%  pdf
+_UFlat5-8          609MB/s ± 0%  html4
+_UFlat6-8          296MB/s ± 0%  txt1
+_UFlat7-8          288MB/s ± 0%  txt2
+_UFlat8-8          309MB/s ± 1%  txt3
+_UFlat9-8          280MB/s ± 1%  txt4
+_UFlat10-8         753MB/s ± 0%  pb
+_UFlat11-8         400MB/s ± 0%  gaviota
+
+_ZFlat0-8          409MB/s ± 1%  html
+_ZFlat1-8          250MB/s ± 1%  urls
+_ZFlat2-8         12.3GB/s ± 1%  jpg
+_ZFlat3-8          132MB/s ± 0%  jpg_200
+_ZFlat4-8         2.92GB/s ± 0%  pdf
+_ZFlat5-8          405MB/s ± 1%  html4
+_ZFlat6-8          179MB/s ± 1%  txt1
+_ZFlat7-8          170MB/s ± 1%  txt2
+_ZFlat8-8          189MB/s ± 1%  txt3
+_ZFlat9-8          164MB/s ± 1%  txt4
+_ZFlat10-8         479MB/s ± 1%  pb
+_ZFlat11-8         270MB/s ± 1%  gaviota
+
+
+
+For comparison (Go's encoded output is byte-for-byte identical to C++'s), here
+are the numbers from C++ Snappy's
+
+make CXXFLAGS="-O2 -DNDEBUG -g" clean snappy_unittest.log && cat snappy_unittest.log
+
+BM_UFlat/0     2.4GB/s  html
+BM_UFlat/1     1.4GB/s  urls
+BM_UFlat/2    21.8GB/s  jpg
+BM_UFlat/3     1.5GB/s  jpg_200
+BM_UFlat/4    13.3GB/s  pdf
+BM_UFlat/5     2.1GB/s  html4
+BM_UFlat/6     1.0GB/s  txt1
+BM_UFlat/7   959.4MB/s  txt2
+BM_UFlat/8     1.0GB/s  txt3
+BM_UFlat/9   864.5MB/s  txt4
+BM_UFlat/10    2.9GB/s  pb
+BM_UFlat/11    1.2GB/s  gaviota
+
+BM_ZFlat/0   944.3MB/s  html (22.31 %)
+BM_ZFlat/1   501.6MB/s  urls (47.78 %)
+BM_ZFlat/2    14.3GB/s  jpg (99.95 %)
+BM_ZFlat/3   538.3MB/s  jpg_200 (73.00 %)
+BM_ZFlat/4     8.3GB/s  pdf (83.30 %)
+BM_ZFlat/5   903.5MB/s  html4 (22.52 %)
+BM_ZFlat/6   336.0MB/s  txt1 (57.88 %)
+BM_ZFlat/7   312.3MB/s  txt2 (61.91 %)
+BM_ZFlat/8   353.1MB/s  txt3 (54.99 %)
+BM_ZFlat/9   289.9MB/s  txt4 (66.26 %)
+BM_ZFlat/10    1.2GB/s  pb (19.68 %)
+BM_ZFlat/11  527.4MB/s  gaviota (37.72 %)

vendor/github.com/golang/snappy/decode.go

@@ -0,0 +1,264 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snappy
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+var (
+	// ErrCorrupt reports that the input is invalid.
+	ErrCorrupt = errors.New("snappy: corrupt input")
+	// ErrTooLarge reports that the uncompressed length is too large.
+	ErrTooLarge = errors.New("snappy: decoded block is too large")
+	// ErrUnsupported reports that the input isn't supported.
+	ErrUnsupported = errors.New("snappy: unsupported input")
+
+	errUnsupportedLiteralLength = errors.New("snappy: unsupported literal length")
+)
+
+// DecodedLen returns the length of the decoded block.
+func DecodedLen(src []byte) (int, error) {
+	v, _, err := decodedLen(src)
+	return v, err
+}
+
+// decodedLen returns the length of the decoded block and the number of bytes
+// that the length header occupied.
+func decodedLen(src []byte) (blockLen, headerLen int, err error) {
+	v, n := binary.Uvarint(src)
+	if n <= 0 || v > 0xffffffff {
+		return 0, 0, ErrCorrupt
+	}
+
+	const wordSize = 32 << (^uint(0) >> 32 & 1)
+	if wordSize == 32 && v > 0x7fffffff {
+		return 0, 0, ErrTooLarge
+	}
+	return int(v), n, nil
+}
+
+const (
+	decodeErrCodeCorrupt                  = 1
+	decodeErrCodeUnsupportedLiteralLength = 2
+)
+
+// Decode returns the decoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire decoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+//
+// Decode handles the Snappy block format, not the Snappy stream format.
+func Decode(dst, src []byte) ([]byte, error) {
+	dLen, s, err := decodedLen(src)
+	if err != nil {
+		return nil, err
+	}
+	if dLen <= len(dst) {
+		dst = dst[:dLen]
+	} else {
+		dst = make([]byte, dLen)
+	}
+	switch decode(dst, src[s:]) {
+	case 0:
+		return dst, nil
+	case decodeErrCodeUnsupportedLiteralLength:
+		return nil, errUnsupportedLiteralLength
+	}
+	return nil, ErrCorrupt
+}
+
+// NewReader returns a new Reader that decompresses from r, using the framing
+// format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func NewReader(r io.Reader) *Reader {
+	return &Reader{
+		r:       r,
+		decoded: make([]byte, maxBlockSize),
+		buf:     make([]byte, maxEncodedLenOfMaxBlockSize+checksumSize),
+	}
+}
+
+// Reader is an io.Reader that can read Snappy-compressed bytes.
+//
+// Reader handles the Snappy stream format, not the Snappy block format.
+type Reader struct {
+	r       io.Reader
+	err     error
+	decoded []byte
+	buf     []byte
+	// decoded[i:j] contains decoded bytes that have not yet been passed on.
+	i, j       int
+	readHeader bool
+}
+
+// Reset discards any buffered data, resets all state, and switches the Snappy
+// reader to read from r. This permits reusing a Reader rather than allocating
+// a new one.
+func (r *Reader) Reset(reader io.Reader) {
+	r.r = reader
+	r.err = nil
+	r.i = 0
+	r.j = 0
+	r.readHeader = false
+}
+
+func (r *Reader) readFull(p []byte, allowEOF bool) (ok bool) {
+	if _, r.err = io.ReadFull(r.r, p); r.err != nil {
+		if r.err == io.ErrUnexpectedEOF || (r.err == io.EOF && !allowEOF) {
+			r.err = ErrCorrupt
+		}
+		return false
+	}
+	return true
+}
+
+func (r *Reader) fill() error {
+	for r.i >= r.j {
+		if !r.readFull(r.buf[:4], true) {
+			return r.err
+		}
+		chunkType := r.buf[0]
+		if !r.readHeader {
+			if chunkType != chunkTypeStreamIdentifier {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			r.readHeader = true
+		}
+		chunkLen := int(r.buf[1]) | int(r.buf[2])<<8 | int(r.buf[3])<<16
+		if chunkLen > len(r.buf) {
+			r.err = ErrUnsupported
+			return r.err
+		}
+
+		// The chunk types are specified at
+		// https://github.com/google/snappy/blob/master/framing_format.txt
+		switch chunkType {
+		case chunkTypeCompressedData:
+			// Section 4.2. Compressed data (chunk type 0x00).
+			if chunkLen < checksumSize {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			buf := r.buf[:chunkLen]
+			if !r.readFull(buf, false) {
+				return r.err
+			}
+			checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+			buf = buf[checksumSize:]
+
+			n, err := DecodedLen(buf)
+			if err != nil {
+				r.err = err
+				return r.err
+			}
+			if n > len(r.decoded) {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			if _, err := Decode(r.decoded, buf); err != nil {
+				r.err = err
+				return r.err
+			}
+			if crc(r.decoded[:n]) != checksum {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			r.i, r.j = 0, n
+			continue
+
+		case chunkTypeUncompressedData:
+			// Section 4.3. Uncompressed data (chunk type 0x01).
+			if chunkLen < checksumSize {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			buf := r.buf[:checksumSize]
+			if !r.readFull(buf, false) {
+				return r.err
+			}
+			checksum := uint32(buf[0]) | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24
+			// Read directly into r.decoded instead of via r.buf.
+			n := chunkLen - checksumSize
+			if n > len(r.decoded) {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			if !r.readFull(r.decoded[:n], false) {
+				return r.err
+			}
+			if crc(r.decoded[:n]) != checksum {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			r.i, r.j = 0, n
+			continue
+
+		case chunkTypeStreamIdentifier:
+			// Section 4.1. Stream identifier (chunk type 0xff).
+			if chunkLen != len(magicBody) {
+				r.err = ErrCorrupt
+				return r.err
+			}
+			if !r.readFull(r.buf[:len(magicBody)], false) {
+				return r.err
+			}
+			for i := 0; i < len(magicBody); i++ {
+				if r.buf[i] != magicBody[i] {
+					r.err = ErrCorrupt
+					return r.err
+				}
+			}
+			continue
+		}
+
+		if chunkType <= 0x7f {
+			// Section 4.5. Reserved unskippable chunks (chunk types 0x02-0x7f).
+			r.err = ErrUnsupported
+			return r.err
+		}
+		// Section 4.4 Padding (chunk type 0xfe).
+		// Section 4.6. Reserved skippable chunks (chunk types 0x80-0xfd).
+		if !r.readFull(r.buf[:chunkLen], false) {
+			return r.err
+		}
+	}
+
+	return nil
+}
+
+// Read satisfies the io.Reader interface.
+func (r *Reader) Read(p []byte) (int, error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+
+	if err := r.fill(); err != nil {
+		return 0, err
+	}
+
+	n := copy(p, r.decoded[r.i:r.j])
+	r.i += n
+	return n, nil
+}
+
+// ReadByte satisfies the io.ByteReader interface.
+func (r *Reader) ReadByte() (byte, error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+
+	if err := r.fill(); err != nil {
+		return 0, err
+	}
+
+	c := r.decoded[r.i]
+	r.i++
+	return c, nil
+}

vendor/github.com/golang/snappy/decode_amd64.s

@@ -0,0 +1,490 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The asm code generally follows the pure Go code in decode_other.go, except
+// where marked with a "!!!".
+
+// func decode(dst, src []byte) int
+//
+// All local variables fit into registers. The non-zero stack size is only to
+// spill registers and push args when issuing a CALL. The register allocation:
+//	- AX	scratch
+//	- BX	scratch
+//	- CX	length or x
+//	- DX	offset
+//	- SI	&src[s]
+//	- DI	&dst[d]
+//	+ R8	dst_base
+//	+ R9	dst_len
+//	+ R10	dst_base + dst_len
+//	+ R11	src_base
+//	+ R12	src_len
+//	+ R13	src_base + src_len
+//	- R14	used by doCopy
+//	- R15	used by doCopy
+//
+// The registers R8-R13 (marked with a "+") are set at the start of the
+// function, and after a CALL returns, and are not otherwise modified.
+//
+// The d variable is implicitly DI - R8,  and len(dst)-d is R10 - DI.
+// The s variable is implicitly SI - R11, and len(src)-s is R13 - SI.
+TEXT ·decode(SB), NOSPLIT, $48-56
+	// Initialize SI, DI and R8-R13.
+	MOVQ dst_base+0(FP), R8
+	MOVQ dst_len+8(FP), R9
+	MOVQ R8, DI
+	MOVQ R8, R10
+	ADDQ R9, R10
+	MOVQ src_base+24(FP), R11
+	MOVQ src_len+32(FP), R12
+	MOVQ R11, SI
+	MOVQ R11, R13
+	ADDQ R12, R13
+
+loop:
+	// for s < len(src)
+	CMPQ SI, R13
+	JEQ  end
+
+	// CX = uint32(src[s])
+	//
+	// switch src[s] & 0x03
+	MOVBLZX (SI), CX
+	MOVL    CX, BX
+	ANDL    $3, BX
+	CMPL    BX, $1
+	JAE     tagCopy
+
+	// ----------------------------------------
+	// The code below handles literal tags.
+
+	// case tagLiteral:
+	// x := uint32(src[s] >> 2)
+	// switch
+	SHRL $2, CX
+	CMPL CX, $60
+	JAE  tagLit60Plus
+
+	// case x < 60:
+	// s++
+	INCQ SI
+
+doLit:
+	// This is the end of the inner "switch", when we have a literal tag.
+	//
+	// We assume that CX == x and x fits in a uint32, where x is the variable
+	// used in the pure Go decode_other.go code.
+
+	// length = int(x) + 1
+	//
+	// Unlike the pure Go code, we don't need to check if length <= 0 because
+	// CX can hold 64 bits, so the increment cannot overflow.
+	INCQ CX
+
+	// Prepare to check if copying length bytes will run past the end of dst or
+	// src.
+	//
+	// AX = len(dst) - d
+	// BX = len(src) - s
+	MOVQ R10, AX
+	SUBQ DI, AX
+	MOVQ R13, BX
+	SUBQ SI, BX
+
+	// !!! Try a faster technique for short (16 or fewer bytes) copies.
+	//
+	// if length > 16 || len(dst)-d < 16 || len(src)-s < 16 {
+	//   goto callMemmove // Fall back on calling runtime·memmove.
+	// }
+	//
+	// The C++ snappy code calls this TryFastAppend. It also checks len(src)-s
+	// against 21 instead of 16, because it cannot assume that all of its input
+	// is contiguous in memory and so it needs to leave enough source bytes to
+	// read the next tag without refilling buffers, but Go's Decode assumes
+	// contiguousness (the src argument is a []byte).
+	CMPQ CX, $16
+	JGT  callMemmove
+	CMPQ AX, $16
+	JLT  callMemmove
+	CMPQ BX, $16
+	JLT  callMemmove
+
+	// !!! Implement the copy from src to dst as a 16-byte load and store.
+	// (Decode's documentation says that dst and src must not overlap.)
+	//
+	// This always copies 16 bytes, instead of only length bytes, but that's
+	// OK. If the input is a valid Snappy encoding then subsequent iterations
+	// will fix up the overrun. Otherwise, Decode returns a nil []byte (and a
+	// non-nil error), so the overrun will be ignored.
+	//
+	// Note that on amd64, it is legal and cheap to issue unaligned 8-byte or
+	// 16-byte loads and stores. This technique probably wouldn't be as
+	// effective on architectures that are fussier about alignment.
+	MOVOU 0(SI), X0
+	MOVOU X0, 0(DI)
+
+	// d += length
+	// s += length
+	ADDQ CX, DI
+	ADDQ CX, SI
+	JMP  loop
+
+callMemmove:
+	// if length > len(dst)-d || length > len(src)-s { etc }
+	CMPQ CX, AX
+	JGT  errCorrupt
+	CMPQ CX, BX
+	JGT  errCorrupt
+
+	// copy(dst[d:], src[s:s+length])
+	//
+	// This means calling runtime·memmove(&dst[d], &src[s], length), so we push
+	// DI, SI and CX as arguments. Coincidentally, we also need to spill those
+	// three registers to the stack, to save local variables across the CALL.
+	MOVQ DI, 0(SP)
+	MOVQ SI, 8(SP)
+	MOVQ CX, 16(SP)
+	MOVQ DI, 24(SP)
+	MOVQ SI, 32(SP)
+	MOVQ CX, 40(SP)
+	CALL runtime·memmove(SB)
+
+	// Restore local variables: unspill registers from the stack and
+	// re-calculate R8-R13.
+	MOVQ 24(SP), DI
+	MOVQ 32(SP), SI
+	MOVQ 40(SP), CX
+	MOVQ dst_base+0(FP), R8
+	MOVQ dst_len+8(FP), R9
+	MOVQ R8, R10
+	ADDQ R9, R10
+	MOVQ src_base+24(FP), R11
+	MOVQ src_len+32(FP), R12
+	MOVQ R11, R13
+	ADDQ R12, R13
+
+	// d += length
+	// s += length
+	ADDQ CX, DI
+	ADDQ CX, SI
+	JMP  loop
+
+tagLit60Plus:
+	// !!! This fragment does the
+	//
+	// s += x - 58; if uint(s) > uint(len(src)) { etc }
+	//
+	// checks. In the asm version, we code it once instead of once per switch case.
+	ADDQ CX, SI
+	SUBQ $58, SI
+	MOVQ SI, BX
+	SUBQ R11, BX
+	CMPQ BX, R12
+	JA   errCorrupt
+
+	// case x == 60:
+	CMPL CX, $61
+	JEQ  tagLit61
+	JA   tagLit62Plus
+
+	// x = uint32(src[s-1])
+	MOVBLZX -1(SI), CX
+	JMP     doLit
+
+tagLit61:
+	// case x == 61:
+	// x = uint32(src[s-2]) | uint32(src[s-1])<<8
+	MOVWLZX -2(SI), CX
+	JMP     doLit
+
+tagLit62Plus:
+	CMPL CX, $62
+	JA   tagLit63
+
+	// case x == 62:
+	// x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+	MOVWLZX -3(SI), CX
+	MOVBLZX -1(SI), BX
+	SHLL    $16, BX
+	ORL     BX, CX
+	JMP     doLit
+
+tagLit63:
+	// case x == 63:
+	// x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+	MOVL -4(SI), CX
+	JMP  doLit
+
+// The code above handles literal tags.
+// ----------------------------------------
+// The code below handles copy tags.
+
+tagCopy4:
+	// case tagCopy4:
+	// s += 5
+	ADDQ $5, SI
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVQ SI, BX
+	SUBQ R11, BX
+	CMPQ BX, R12
+	JA   errCorrupt
+
+	// length = 1 + int(src[s-5])>>2
+	SHRQ $2, CX
+	INCQ CX
+
+	// offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+	MOVLQZX -4(SI), DX
+	JMP     doCopy
+
+tagCopy2:
+	// case tagCopy2:
+	// s += 3
+	ADDQ $3, SI
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVQ SI, BX
+	SUBQ R11, BX
+	CMPQ BX, R12
+	JA   errCorrupt
+
+	// length = 1 + int(src[s-3])>>2
+	SHRQ $2, CX
+	INCQ CX
+
+	// offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+	MOVWQZX -2(SI), DX
+	JMP     doCopy
+
+tagCopy:
+	// We have a copy tag. We assume that:
+	//	- BX == src[s] & 0x03
+	//	- CX == src[s]
+	CMPQ BX, $2
+	JEQ  tagCopy2
+	JA   tagCopy4
+
+	// case tagCopy1:
+	// s += 2
+	ADDQ $2, SI
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVQ SI, BX
+	SUBQ R11, BX
+	CMPQ BX, R12
+	JA   errCorrupt
+
+	// offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+	MOVQ    CX, DX
+	ANDQ    $0xe0, DX
+	SHLQ    $3, DX
+	MOVBQZX -1(SI), BX
+	ORQ     BX, DX
+
+	// length = 4 + int(src[s-2])>>2&0x7
+	SHRQ $2, CX
+	ANDQ $7, CX
+	ADDQ $4, CX
+
+doCopy:
+	// This is the end of the outer "switch", when we have a copy tag.
+	//
+	// We assume that:
+	//	- CX == length && CX > 0
+	//	- DX == offset
+
+	// if offset <= 0 { etc }
+	CMPQ DX, $0
+	JLE  errCorrupt
+
+	// if d < offset { etc }
+	MOVQ DI, BX
+	SUBQ R8, BX
+	CMPQ BX, DX
+	JLT  errCorrupt
+
+	// if length > len(dst)-d { etc }
+	MOVQ R10, BX
+	SUBQ DI, BX
+	CMPQ CX, BX
+	JGT  errCorrupt
+
+	// forwardCopy(dst[d:d+length], dst[d-offset:]); d += length
+	//
+	// Set:
+	//	- R14 = len(dst)-d
+	//	- R15 = &dst[d-offset]
+	MOVQ R10, R14
+	SUBQ DI, R14
+	MOVQ DI, R15
+	SUBQ DX, R15
+
+	// !!! Try a faster technique for short (16 or fewer bytes) forward copies.
+	//
+	// First, try using two 8-byte load/stores, similar to the doLit technique
+	// above. Even if dst[d:d+length] and dst[d-offset:] can overlap, this is
+	// still OK if offset >= 8. Note that this has to be two 8-byte load/stores
+	// and not one 16-byte load/store, and the first store has to be before the
+	// second load, due to the overlap if offset is in the range [8, 16).
+	//
+	// if length > 16 || offset < 8 || len(dst)-d < 16 {
+	//   goto slowForwardCopy
+	// }
+	// copy 16 bytes
+	// d += length
+	CMPQ CX, $16
+	JGT  slowForwardCopy
+	CMPQ DX, $8
+	JLT  slowForwardCopy
+	CMPQ R14, $16
+	JLT  slowForwardCopy
+	MOVQ 0(R15), AX
+	MOVQ AX, 0(DI)
+	MOVQ 8(R15), BX
+	MOVQ BX, 8(DI)
+	ADDQ CX, DI
+	JMP  loop
+
+slowForwardCopy:
+	// !!! If the forward copy is longer than 16 bytes, or if offset < 8, we
+	// can still try 8-byte load stores, provided we can overrun up to 10 extra
+	// bytes. As above, the overrun will be fixed up by subsequent iterations
+	// of the outermost loop.
+	//
+	// The C++ snappy code calls this technique IncrementalCopyFastPath. Its
+	// commentary says:
+	//
+	// ----
+	//
+	// The main part of this loop is a simple copy of eight bytes at a time
+	// until we've copied (at least) the requested amount of bytes.  However,
+	// if d and d-offset are less than eight bytes apart (indicating a
+	// repeating pattern of length < 8), we first need to expand the pattern in
+	// order to get the correct results. For instance, if the buffer looks like
+	// this, with the eight-byte <d-offset> and <d> patterns marked as
+	// intervals:
+	//
+	//    abxxxxxxxxxxxx
+	//    [------]           d-offset
+	//      [------]         d
+	//
+	// a single eight-byte copy from <d-offset> to <d> will repeat the pattern
+	// once, after which we can move <d> two bytes without moving <d-offset>:
+	//
+	//    ababxxxxxxxxxx
+	//    [------]           d-offset
+	//        [------]       d
+	//
+	// and repeat the exercise until the two no longer overlap.
+	//
+	// This allows us to do very well in the special case of one single byte
+	// repeated many times, without taking a big hit for more general cases.
+	//
+	// The worst case of extra writing past the end of the match occurs when
+	// offset == 1 and length == 1; the last copy will read from byte positions
+	// [0..7] and write to [4..11], whereas it was only supposed to write to
+	// position 1. Thus, ten excess bytes.
+	//
+	// ----
+	//
+	// That "10 byte overrun" worst case is confirmed by Go's
+	// TestSlowForwardCopyOverrun, which also tests the fixUpSlowForwardCopy
+	// and finishSlowForwardCopy algorithm.
+	//
+	// if length > len(dst)-d-10 {
+	//   goto verySlowForwardCopy
+	// }
+	SUBQ $10, R14
+	CMPQ CX, R14
+	JGT  verySlowForwardCopy
+
+makeOffsetAtLeast8:
+	// !!! As above, expand the pattern so that offset >= 8 and we can use
+	// 8-byte load/stores.
+	//
+	// for offset < 8 {
+	//   copy 8 bytes from dst[d-offset:] to dst[d:]
+	//   length -= offset
+	//   d      += offset
+	//   offset += offset
+	//   // The two previous lines together means that d-offset, and therefore
+	//   // R15, is unchanged.
+	// }
+	CMPQ DX, $8
+	JGE  fixUpSlowForwardCopy
+	MOVQ (R15), BX
+	MOVQ BX, (DI)
+	SUBQ DX, CX
+	ADDQ DX, DI
+	ADDQ DX, DX
+	JMP  makeOffsetAtLeast8
+
+fixUpSlowForwardCopy:
+	// !!! Add length (which might be negative now) to d (implied by DI being
+	// &dst[d]) so that d ends up at the right place when we jump back to the
+	// top of the loop. Before we do that, though, we save DI to AX so that, if
+	// length is positive, copying the remaining length bytes will write to the
+	// right place.
+	MOVQ DI, AX
+	ADDQ CX, DI
+
+finishSlowForwardCopy:
+	// !!! Repeat 8-byte load/stores until length <= 0. Ending with a negative
+	// length means that we overrun, but as above, that will be fixed up by
+	// subsequent iterations of the outermost loop.
+	CMPQ CX, $0
+	JLE  loop
+	MOVQ (R15), BX
+	MOVQ BX, (AX)
+	ADDQ $8, R15
+	ADDQ $8, AX
+	SUBQ $8, CX
+	JMP  finishSlowForwardCopy
+
+verySlowForwardCopy:
+	// verySlowForwardCopy is a simple implementation of forward copy. In C
+	// parlance, this is a do/while loop instead of a while loop, since we know
+	// that length > 0. In Go syntax:
+	//
+	// for {
+	//   dst[d] = dst[d - offset]
+	//   d++
+	//   length--
+	//   if length == 0 {
+	//     break
+	//   }
+	// }
+	MOVB (R15), BX
+	MOVB BX, (DI)
+	INCQ R15
+	INCQ DI
+	DECQ CX
+	JNZ  verySlowForwardCopy
+	JMP  loop
+
+// The code above handles copy tags.
+// ----------------------------------------
+
+end:
+	// This is the end of the "for s < len(src)".
+	//
+	// if d != len(dst) { etc }
+	CMPQ DI, R10
+	JNE  errCorrupt
+
+	// return 0
+	MOVQ $0, ret+48(FP)
+	RET
+
+errCorrupt:
+	// return decodeErrCodeCorrupt
+	MOVQ $1, ret+48(FP)
+	RET

vendor/github.com/golang/snappy/decode_arm64.s

@@ -0,0 +1,494 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The asm code generally follows the pure Go code in decode_other.go, except
+// where marked with a "!!!".
+
+// func decode(dst, src []byte) int
+//
+// All local variables fit into registers. The non-zero stack size is only to
+// spill registers and push args when issuing a CALL. The register allocation:
+//	- R2	scratch
+//	- R3	scratch
+//	- R4	length or x
+//	- R5	offset
+//	- R6	&src[s]
+//	- R7	&dst[d]
+//	+ R8	dst_base
+//	+ R9	dst_len
+//	+ R10	dst_base + dst_len
+//	+ R11	src_base
+//	+ R12	src_len
+//	+ R13	src_base + src_len
+//	- R14	used by doCopy
+//	- R15	used by doCopy
+//
+// The registers R8-R13 (marked with a "+") are set at the start of the
+// function, and after a CALL returns, and are not otherwise modified.
+//
+// The d variable is implicitly R7 - R8,  and len(dst)-d is R10 - R7.
+// The s variable is implicitly R6 - R11, and len(src)-s is R13 - R6.
+TEXT ·decode(SB), NOSPLIT, $56-56
+	// Initialize R6, R7 and R8-R13.
+	MOVD dst_base+0(FP), R8
+	MOVD dst_len+8(FP), R9
+	MOVD R8, R7
+	MOVD R8, R10
+	ADD  R9, R10, R10
+	MOVD src_base+24(FP), R11
+	MOVD src_len+32(FP), R12
+	MOVD R11, R6
+	MOVD R11, R13
+	ADD  R12, R13, R13
+
+loop:
+	// for s < len(src)
+	CMP R13, R6
+	BEQ end
+
+	// R4 = uint32(src[s])
+	//
+	// switch src[s] & 0x03
+	MOVBU (R6), R4
+	MOVW  R4, R3
+	ANDW  $3, R3
+	MOVW  $1, R1
+	CMPW  R1, R3
+	BGE   tagCopy
+
+	// ----------------------------------------
+	// The code below handles literal tags.
+
+	// case tagLiteral:
+	// x := uint32(src[s] >> 2)
+	// switch
+	MOVW $60, R1
+	LSRW $2, R4, R4
+	CMPW R4, R1
+	BLS  tagLit60Plus
+
+	// case x < 60:
+	// s++
+	ADD $1, R6, R6
+
+doLit:
+	// This is the end of the inner "switch", when we have a literal tag.
+	//
+	// We assume that R4 == x and x fits in a uint32, where x is the variable
+	// used in the pure Go decode_other.go code.
+
+	// length = int(x) + 1
+	//
+	// Unlike the pure Go code, we don't need to check if length <= 0 because
+	// R4 can hold 64 bits, so the increment cannot overflow.
+	ADD $1, R4, R4
+
+	// Prepare to check if copying length bytes will run past the end of dst or
+	// src.
+	//
+	// R2 = len(dst) - d
+	// R3 = len(src) - s
+	MOVD R10, R2
+	SUB  R7, R2, R2
+	MOVD R13, R3
+	SUB  R6, R3, R3
+
+	// !!! Try a faster technique for short (16 or fewer bytes) copies.
+	//
+	// if length > 16 || len(dst)-d < 16 || len(src)-s < 16 {
+	//   goto callMemmove // Fall back on calling runtime·memmove.
+	// }
+	//
+	// The C++ snappy code calls this TryFastAppend. It also checks len(src)-s
+	// against 21 instead of 16, because it cannot assume that all of its input
+	// is contiguous in memory and so it needs to leave enough source bytes to
+	// read the next tag without refilling buffers, but Go's Decode assumes
+	// contiguousness (the src argument is a []byte).
+	CMP $16, R4
+	BGT callMemmove
+	CMP $16, R2
+	BLT callMemmove
+	CMP $16, R3
+	BLT callMemmove
+
+	// !!! Implement the copy from src to dst as a 16-byte load and store.
+	// (Decode's documentation says that dst and src must not overlap.)
+	//
+	// This always copies 16 bytes, instead of only length bytes, but that's
+	// OK. If the input is a valid Snappy encoding then subsequent iterations
+	// will fix up the overrun. Otherwise, Decode returns a nil []byte (and a
+	// non-nil error), so the overrun will be ignored.
+	//
+	// Note that on arm64, it is legal and cheap to issue unaligned 8-byte or
+	// 16-byte loads and stores. This technique probably wouldn't be as
+	// effective on architectures that are fussier about alignment.
+	LDP 0(R6), (R14, R15)
+	STP (R14, R15), 0(R7)
+
+	// d += length
+	// s += length
+	ADD R4, R7, R7
+	ADD R4, R6, R6
+	B   loop
+
+callMemmove:
+	// if length > len(dst)-d || length > len(src)-s { etc }
+	CMP R2, R4
+	BGT errCorrupt
+	CMP R3, R4
+	BGT errCorrupt
+
+	// copy(dst[d:], src[s:s+length])
+	//
+	// This means calling runtime·memmove(&dst[d], &src[s], length), so we push
+	// R7, R6 and R4 as arguments. Coincidentally, we also need to spill those
+	// three registers to the stack, to save local variables across the CALL.
+	MOVD R7, 8(RSP)
+	MOVD R6, 16(RSP)
+	MOVD R4, 24(RSP)
+	MOVD R7, 32(RSP)
+	MOVD R6, 40(RSP)
+	MOVD R4, 48(RSP)
+	CALL runtime·memmove(SB)
+
+	// Restore local variables: unspill registers from the stack and
+	// re-calculate R8-R13.
+	MOVD 32(RSP), R7
+	MOVD 40(RSP), R6
+	MOVD 48(RSP), R4
+	MOVD dst_base+0(FP), R8
+	MOVD dst_len+8(FP), R9
+	MOVD R8, R10
+	ADD  R9, R10, R10
+	MOVD src_base+24(FP), R11
+	MOVD src_len+32(FP), R12
+	MOVD R11, R13
+	ADD  R12, R13, R13
+
+	// d += length
+	// s += length
+	ADD R4, R7, R7
+	ADD R4, R6, R6
+	B   loop
+
+tagLit60Plus:
+	// !!! This fragment does the
+	//
+	// s += x - 58; if uint(s) > uint(len(src)) { etc }
+	//
+	// checks. In the asm version, we code it once instead of once per switch case.
+	ADD  R4, R6, R6
+	SUB  $58, R6, R6
+	MOVD R6, R3
+	SUB  R11, R3, R3
+	CMP  R12, R3
+	BGT  errCorrupt
+
+	// case x == 60:
+	MOVW $61, R1
+	CMPW R1, R4
+	BEQ  tagLit61
+	BGT  tagLit62Plus
+
+	// x = uint32(src[s-1])
+	MOVBU -1(R6), R4
+	B     doLit
+
+tagLit61:
+	// case x == 61:
+	// x = uint32(src[s-2]) | uint32(src[s-1])<<8
+	MOVHU -2(R6), R4
+	B     doLit
+
+tagLit62Plus:
+	CMPW $62, R4
+	BHI  tagLit63
+
+	// case x == 62:
+	// x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+	MOVHU -3(R6), R4
+	MOVBU -1(R6), R3
+	ORR   R3<<16, R4
+	B     doLit
+
+tagLit63:
+	// case x == 63:
+	// x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+	MOVWU -4(R6), R4
+	B     doLit
+
+	// The code above handles literal tags.
+	// ----------------------------------------
+	// The code below handles copy tags.
+
+tagCopy4:
+	// case tagCopy4:
+	// s += 5
+	ADD $5, R6, R6
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVD R6, R3
+	SUB  R11, R3, R3
+	CMP  R12, R3
+	BGT  errCorrupt
+
+	// length = 1 + int(src[s-5])>>2
+	MOVD $1, R1
+	ADD  R4>>2, R1, R4
+
+	// offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+	MOVWU -4(R6), R5
+	B     doCopy
+
+tagCopy2:
+	// case tagCopy2:
+	// s += 3
+	ADD $3, R6, R6
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVD R6, R3
+	SUB  R11, R3, R3
+	CMP  R12, R3
+	BGT  errCorrupt
+
+	// length = 1 + int(src[s-3])>>2
+	MOVD $1, R1
+	ADD  R4>>2, R1, R4
+
+	// offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+	MOVHU -2(R6), R5
+	B     doCopy
+
+tagCopy:
+	// We have a copy tag. We assume that:
+	//	- R3 == src[s] & 0x03
+	//	- R4 == src[s]
+	CMP $2, R3
+	BEQ tagCopy2
+	BGT tagCopy4
+
+	// case tagCopy1:
+	// s += 2
+	ADD $2, R6, R6
+
+	// if uint(s) > uint(len(src)) { etc }
+	MOVD R6, R3
+	SUB  R11, R3, R3
+	CMP  R12, R3
+	BGT  errCorrupt
+
+	// offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+	MOVD  R4, R5
+	AND   $0xe0, R5
+	MOVBU -1(R6), R3
+	ORR   R5<<3, R3, R5
+
+	// length = 4 + int(src[s-2])>>2&0x7
+	MOVD $7, R1
+	AND  R4>>2, R1, R4
+	ADD  $4, R4, R4
+
+doCopy:
+	// This is the end of the outer "switch", when we have a copy tag.
+	//
+	// We assume that:
+	//	- R4 == length && R4 > 0
+	//	- R5 == offset
+
+	// if offset <= 0 { etc }
+	MOVD $0, R1
+	CMP  R1, R5
+	BLE  errCorrupt
+
+	// if d < offset { etc }
+	MOVD R7, R3
+	SUB  R8, R3, R3
+	CMP  R5, R3
+	BLT  errCorrupt
+
+	// if length > len(dst)-d { etc }
+	MOVD R10, R3
+	SUB  R7, R3, R3
+	CMP  R3, R4
+	BGT  errCorrupt
+
+	// forwardCopy(dst[d:d+length], dst[d-offset:]); d += length
+	//
+	// Set:
+	//	- R14 = len(dst)-d
+	//	- R15 = &dst[d-offset]
+	MOVD R10, R14
+	SUB  R7, R14, R14
+	MOVD R7, R15
+	SUB  R5, R15, R15
+
+	// !!! Try a faster technique for short (16 or fewer bytes) forward copies.
+	//
+	// First, try using two 8-byte load/stores, similar to the doLit technique
+	// above. Even if dst[d:d+length] and dst[d-offset:] can overlap, this is
+	// still OK if offset >= 8. Note that this has to be two 8-byte load/stores
+	// and not one 16-byte load/store, and the first store has to be before the
+	// second load, due to the overlap if offset is in the range [8, 16).
+	//
+	// if length > 16 || offset < 8 || len(dst)-d < 16 {
+	//   goto slowForwardCopy
+	// }
+	// copy 16 bytes
+	// d += length
+	CMP  $16, R4
+	BGT  slowForwardCopy
+	CMP  $8, R5
+	BLT  slowForwardCopy
+	CMP  $16, R14
+	BLT  slowForwardCopy
+	MOVD 0(R15), R2
+	MOVD R2, 0(R7)
+	MOVD 8(R15), R3
+	MOVD R3, 8(R7)
+	ADD  R4, R7, R7
+	B    loop
+
+slowForwardCopy:
+	// !!! If the forward copy is longer than 16 bytes, or if offset < 8, we
+	// can still try 8-byte load stores, provided we can overrun up to 10 extra
+	// bytes. As above, the overrun will be fixed up by subsequent iterations
+	// of the outermost loop.
+	//
+	// The C++ snappy code calls this technique IncrementalCopyFastPath. Its
+	// commentary says:
+	//
+	// ----
+	//
+	// The main part of this loop is a simple copy of eight bytes at a time
+	// until we've copied (at least) the requested amount of bytes.  However,
+	// if d and d-offset are less than eight bytes apart (indicating a
+	// repeating pattern of length < 8), we first need to expand the pattern in
+	// order to get the correct results. For instance, if the buffer looks like
+	// this, with the eight-byte <d-offset> and <d> patterns marked as
+	// intervals:
+	//
+	//    abxxxxxxxxxxxx
+	//    [------]           d-offset
+	//      [------]         d
+	//
+	// a single eight-byte copy from <d-offset> to <d> will repeat the pattern
+	// once, after which we can move <d> two bytes without moving <d-offset>:
+	//
+	//    ababxxxxxxxxxx
+	//    [------]           d-offset
+	//        [------]       d
+	//
+	// and repeat the exercise until the two no longer overlap.
+	//
+	// This allows us to do very well in the special case of one single byte
+	// repeated many times, without taking a big hit for more general cases.
+	//
+	// The worst case of extra writing past the end of the match occurs when
+	// offset == 1 and length == 1; the last copy will read from byte positions
+	// [0..7] and write to [4..11], whereas it was only supposed to write to
+	// position 1. Thus, ten excess bytes.
+	//
+	// ----
+	//
+	// That "10 byte overrun" worst case is confirmed by Go's
+	// TestSlowForwardCopyOverrun, which also tests the fixUpSlowForwardCopy
+	// and finishSlowForwardCopy algorithm.
+	//
+	// if length > len(dst)-d-10 {
+	//   goto verySlowForwardCopy
+	// }
+	SUB $10, R14, R14
+	CMP R14, R4
+	BGT verySlowForwardCopy
+
+makeOffsetAtLeast8:
+	// !!! As above, expand the pattern so that offset >= 8 and we can use
+	// 8-byte load/stores.
+	//
+	// for offset < 8 {
+	//   copy 8 bytes from dst[d-offset:] to dst[d:]
+	//   length -= offset
+	//   d      += offset
+	//   offset += offset
+	//   // The two previous lines together means that d-offset, and therefore
+	//   // R15, is unchanged.
+	// }
+	CMP  $8, R5
+	BGE  fixUpSlowForwardCopy
+	MOVD (R15), R3
+	MOVD R3, (R7)
+	SUB  R5, R4, R4
+	ADD  R5, R7, R7
+	ADD  R5, R5, R5
+	B    makeOffsetAtLeast8
+
+fixUpSlowForwardCopy:
+	// !!! Add length (which might be negative now) to d (implied by R7 being
+	// &dst[d]) so that d ends up at the right place when we jump back to the
+	// top of the loop. Before we do that, though, we save R7 to R2 so that, if
+	// length is positive, copying the remaining length bytes will write to the
+	// right place.
+	MOVD R7, R2
+	ADD  R4, R7, R7
+
+finishSlowForwardCopy:
+	// !!! Repeat 8-byte load/stores until length <= 0. Ending with a negative
+	// length means that we overrun, but as above, that will be fixed up by
+	// subsequent iterations of the outermost loop.
+	MOVD $0, R1
+	CMP  R1, R4
+	BLE  loop
+	MOVD (R15), R3
+	MOVD R3, (R2)
+	ADD  $8, R15, R15
+	ADD  $8, R2, R2
+	SUB  $8, R4, R4
+	B    finishSlowForwardCopy
+
+verySlowForwardCopy:
+	// verySlowForwardCopy is a simple implementation of forward copy. In C
+	// parlance, this is a do/while loop instead of a while loop, since we know
+	// that length > 0. In Go syntax:
+	//
+	// for {
+	//   dst[d] = dst[d - offset]
+	//   d++
+	//   length--
+	//   if length == 0 {
+	//     break
+	//   }
+	// }
+	MOVB (R15), R3
+	MOVB R3, (R7)
+	ADD  $1, R15, R15
+	ADD  $1, R7, R7
+	SUB  $1, R4, R4
+	CBNZ R4, verySlowForwardCopy
+	B    loop
+
+	// The code above handles copy tags.
+	// ----------------------------------------
+
+end:
+	// This is the end of the "for s < len(src)".
+	//
+	// if d != len(dst) { etc }
+	CMP R10, R7
+	BNE errCorrupt
+
+	// return 0
+	MOVD $0, ret+48(FP)
+	RET
+
+errCorrupt:
+	// return decodeErrCodeCorrupt
+	MOVD $1, R2
+	MOVD R2, ret+48(FP)
+	RET

vendor/github.com/golang/snappy/decode_asm.go

@@ -0,0 +1,15 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+// +build amd64 arm64
+
+package snappy
+
+// decode has the same semantics as in decode_other.go.
+//
+//go:noescape
+func decode(dst, src []byte) int

vendor/github.com/golang/snappy/decode_other.go

@@ -0,0 +1,115 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64,!arm64 appengine !gc noasm
+
+package snappy
+
+// decode writes the decoding of src to dst. It assumes that the varint-encoded
+// length of the decompressed bytes has already been read, and that len(dst)
+// equals that length.
+//
+// It returns 0 on success or a decodeErrCodeXxx error code on failure.
+func decode(dst, src []byte) int {
+	var d, s, offset, length int
+	for s < len(src) {
+		switch src[s] & 0x03 {
+		case tagLiteral:
+			x := uint32(src[s] >> 2)
+			switch {
+			case x < 60:
+				s++
+			case x == 60:
+				s += 2
+				if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+					return decodeErrCodeCorrupt
+				}
+				x = uint32(src[s-1])
+			case x == 61:
+				s += 3
+				if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+					return decodeErrCodeCorrupt
+				}
+				x = uint32(src[s-2]) | uint32(src[s-1])<<8
+			case x == 62:
+				s += 4
+				if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+					return decodeErrCodeCorrupt
+				}
+				x = uint32(src[s-3]) | uint32(src[s-2])<<8 | uint32(src[s-1])<<16
+			case x == 63:
+				s += 5
+				if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+					return decodeErrCodeCorrupt
+				}
+				x = uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24
+			}
+			length = int(x) + 1
+			if length <= 0 {
+				return decodeErrCodeUnsupportedLiteralLength
+			}
+			if length > len(dst)-d || length > len(src)-s {
+				return decodeErrCodeCorrupt
+			}
+			copy(dst[d:], src[s:s+length])
+			d += length
+			s += length
+			continue
+
+		case tagCopy1:
+			s += 2
+			if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+				return decodeErrCodeCorrupt
+			}
+			length = 4 + int(src[s-2])>>2&0x7
+			offset = int(uint32(src[s-2])&0xe0<<3 | uint32(src[s-1]))
+
+		case tagCopy2:
+			s += 3
+			if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+				return decodeErrCodeCorrupt
+			}
+			length = 1 + int(src[s-3])>>2
+			offset = int(uint32(src[s-2]) | uint32(src[s-1])<<8)
+
+		case tagCopy4:
+			s += 5
+			if uint(s) > uint(len(src)) { // The uint conversions catch overflow from the previous line.
+				return decodeErrCodeCorrupt
+			}
+			length = 1 + int(src[s-5])>>2
+			offset = int(uint32(src[s-4]) | uint32(src[s-3])<<8 | uint32(src[s-2])<<16 | uint32(src[s-1])<<24)
+		}
+
+		if offset <= 0 || d < offset || length > len(dst)-d {
+			return decodeErrCodeCorrupt
+		}
+		// Copy from an earlier sub-slice of dst to a later sub-slice.
+		// If no overlap, use the built-in copy:
+		if offset >= length {
+			copy(dst[d:d+length], dst[d-offset:])
+			d += length
+			continue
+		}
+
+		// Unlike the built-in copy function, this byte-by-byte copy always runs
+		// forwards, even if the slices overlap. Conceptually, this is:
+		//
+		// d += forwardCopy(dst[d:d+length], dst[d-offset:])
+		//
+		// We align the slices into a and b and show the compiler they are the same size.
+		// This allows the loop to run without bounds checks.
+		a := dst[d : d+length]
+		b := dst[d-offset:]
+		b = b[:len(a)]
+		for i := range a {
+			a[i] = b[i]
+		}
+		d += length
+	}
+	if d != len(dst) {
+		return decodeErrCodeCorrupt
+	}
+	return 0
+}

vendor/github.com/golang/snappy/encode.go

@@ -0,0 +1,289 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package snappy
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+// Encode returns the encoded form of src. The returned slice may be a sub-
+// slice of dst if dst was large enough to hold the entire encoded block.
+// Otherwise, a newly allocated slice will be returned.
+//
+// The dst and src must not overlap. It is valid to pass a nil dst.
+//
+// Encode handles the Snappy block format, not the Snappy stream format.
+func Encode(dst, src []byte) []byte {
+	if n := MaxEncodedLen(len(src)); n < 0 {
+		panic(ErrTooLarge)
+	} else if len(dst) < n {
+		dst = make([]byte, n)
+	}
+
+	// The block starts with the varint-encoded length of the decompressed bytes.
+	d := binary.PutUvarint(dst, uint64(len(src)))
+
+	for len(src) > 0 {
+		p := src
+		src = nil
+		if len(p) > maxBlockSize {
+			p, src = p[:maxBlockSize], p[maxBlockSize:]
+		}
+		if len(p) < minNonLiteralBlockSize {
+			d += emitLiteral(dst[d:], p)
+		} else {
+			d += encodeBlock(dst[d:], p)
+		}
+	}
+	return dst[:d]
+}
+
+// inputMargin is the minimum number of extra input bytes to keep, inside
+// encodeBlock's inner loop. On some architectures, this margin lets us
+// implement a fast path for emitLiteral, where the copy of short (<= 16 byte)
+// literals can be implemented as a single load to and store from a 16-byte
+// register. That literal's actual length can be as short as 1 byte, so this
+// can copy up to 15 bytes too much, but that's OK as subsequent iterations of
+// the encoding loop will fix up the copy overrun, and this inputMargin ensures
+// that we don't overrun the dst and src buffers.
+const inputMargin = 16 - 1
+
+// minNonLiteralBlockSize is the minimum size of the input to encodeBlock that
+// could be encoded with a copy tag. This is the minimum with respect to the
+// algorithm used by encodeBlock, not a minimum enforced by the file format.
+//
+// The encoded output must start with at least a 1 byte literal, as there are
+// no previous bytes to copy. A minimal (1 byte) copy after that, generated
+// from an emitCopy call in encodeBlock's main loop, would require at least
+// another inputMargin bytes, for the reason above: we want any emitLiteral
+// calls inside encodeBlock's main loop to use the fast path if possible, which
+// requires being able to overrun by inputMargin bytes. Thus,
+// minNonLiteralBlockSize equals 1 + 1 + inputMargin.
+//
+// The C++ code doesn't use this exact threshold, but it could, as discussed at
+// https://groups.google.com/d/topic/snappy-compression/oGbhsdIJSJ8/discussion
+// The difference between Go (2+inputMargin) and C++ (inputMargin) is purely an
+// optimization. It should not affect the encoded form. This is tested by
+// TestSameEncodingAsCppShortCopies.
+const minNonLiteralBlockSize = 1 + 1 + inputMargin
+
+// MaxEncodedLen returns the maximum length of a snappy block, given its
+// uncompressed length.
+//
+// It will return a negative value if srcLen is too large to encode.
+func MaxEncodedLen(srcLen int) int {
+	n := uint64(srcLen)
+	if n > 0xffffffff {
+		return -1
+	}
+	// Compressed data can be defined as:
+	//    compressed := item* literal*
+	//    item       := literal* copy
+	//
+	// The trailing literal sequence has a space blowup of at most 62/60
+	// since a literal of length 60 needs one tag byte + one extra byte
+	// for length information.
+	//
+	// Item blowup is trickier to measure. Suppose the "copy" op copies
+	// 4 bytes of data. Because of a special check in the encoding code,
+	// we produce a 4-byte copy only if the offset is < 65536. Therefore
+	// the copy op takes 3 bytes to encode, and this type of item leads
+	// to at most the 62/60 blowup for representing literals.
+	//
+	// Suppose the "copy" op copies 5 bytes of data. If the offset is big
+	// enough, it will take 5 bytes to encode the copy op. Therefore the
+	// worst case here is a one-byte literal followed by a five-byte copy.
+	// That is, 6 bytes of input turn into 7 bytes of "compressed" data.
+	//
+	// This last factor dominates the blowup, so the final estimate is:
+	n = 32 + n + n/6
+	if n > 0xffffffff {
+		return -1
+	}
+	return int(n)
+}
+
+var errClosed = errors.New("snappy: Writer is closed")
+
+// NewWriter returns a new Writer that compresses to w.
+//
+// The Writer returned does not buffer writes. There is no need to Flush or
+// Close such a Writer.
+//
+// Deprecated: the Writer returned is not suitable for many small writes, only
+// for few large writes. Use NewBufferedWriter instead, which is efficient
+// regardless of the frequency and shape of the writes, and remember to Close
+// that Writer when done.
+func NewWriter(w io.Writer) *Writer {
+	return &Writer{
+		w:    w,
+		obuf: make([]byte, obufLen),
+	}
+}
+
+// NewBufferedWriter returns a new Writer that compresses to w, using the
+// framing format described at
+// https://github.com/google/snappy/blob/master/framing_format.txt
+//
+// The Writer returned buffers writes. Users must call Close to guarantee all
+// data has been forwarded to the underlying io.Writer. They may also call
+// Flush zero or more times before calling Close.
+func NewBufferedWriter(w io.Writer) *Writer {
+	return &Writer{
+		w:    w,
+		ibuf: make([]byte, 0, maxBlockSize),
+		obuf: make([]byte, obufLen),
+	}
+}
+
+// Writer is an io.Writer that can write Snappy-compressed bytes.
+//
+// Writer handles the Snappy stream format, not the Snappy block format.
+type Writer struct {
+	w   io.Writer
+	err error
+
+	// ibuf is a buffer for the incoming (uncompressed) bytes.
+	//
+	// Its use is optional. For backwards compatibility, Writers created by the
+	// NewWriter function have ibuf == nil, do not buffer incoming bytes, and
+	// therefore do not need to be Flush'ed or Close'd.
+	ibuf []byte
+
+	// obuf is a buffer for the outgoing (compressed) bytes.
+	obuf []byte
+
+	// wroteStreamHeader is whether we have written the stream header.
+	wroteStreamHeader bool
+}
+
+// Reset discards the writer's state and switches the Snappy writer to write to
+// w. This permits reusing a Writer rather than allocating a new one.
+func (w *Writer) Reset(writer io.Writer) {
+	w.w = writer
+	w.err = nil
+	if w.ibuf != nil {
+		w.ibuf = w.ibuf[:0]
+	}
+	w.wroteStreamHeader = false
+}
+
+// Write satisfies the io.Writer interface.
+func (w *Writer) Write(p []byte) (nRet int, errRet error) {
+	if w.ibuf == nil {
+		// Do not buffer incoming bytes. This does not perform or compress well
+		// if the caller of Writer.Write writes many small slices. This
+		// behavior is therefore deprecated, but still supported for backwards
+		// compatibility with code that doesn't explicitly Flush or Close.
+		return w.write(p)
+	}
+
+	// The remainder of this method is based on bufio.Writer.Write from the
+	// standard library.
+
+	for len(p) > (cap(w.ibuf)-len(w.ibuf)) && w.err == nil {
+		var n int
+		if len(w.ibuf) == 0 {
+			// Large write, empty buffer.
+			// Write directly from p to avoid copy.
+			n, _ = w.write(p)
+		} else {
+			n = copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+			w.ibuf = w.ibuf[:len(w.ibuf)+n]
+			w.Flush()
+		}
+		nRet += n
+		p = p[n:]
+	}
+	if w.err != nil {
+		return nRet, w.err
+	}
+	n := copy(w.ibuf[len(w.ibuf):cap(w.ibuf)], p)
+	w.ibuf = w.ibuf[:len(w.ibuf)+n]
+	nRet += n
+	return nRet, nil
+}
+
+func (w *Writer) write(p []byte) (nRet int, errRet error) {
+	if w.err != nil {
+		return 0, w.err
+	}
+	for len(p) > 0 {
+		obufStart := len(magicChunk)
+		if !w.wroteStreamHeader {
+			w.wroteStreamHeader = true
+			copy(w.obuf, magicChunk)
+			obufStart = 0
+		}
+
+		var uncompressed []byte
+		if len(p) > maxBlockSize {
+			uncompressed, p = p[:maxBlockSize], p[maxBlockSize:]
+		} else {
+			uncompressed, p = p, nil
+		}
+		checksum := crc(uncompressed)
+
+		// Compress the buffer, discarding the result if the improvement
+		// isn't at least 12.5%.
+		compressed := Encode(w.obuf[obufHeaderLen:], uncompressed)
+		chunkType := uint8(chunkTypeCompressedData)
+		chunkLen := 4 + len(compressed)
+		obufEnd := obufHeaderLen + len(compressed)
+		if len(compressed) >= len(uncompressed)-len(uncompressed)/8 {
+			chunkType = chunkTypeUncompressedData
+			chunkLen = 4 + len(uncompressed)
+			obufEnd = obufHeaderLen
+		}
+
+		// Fill in the per-chunk header that comes before the body.
+		w.obuf[len(magicChunk)+0] = chunkType
+		w.obuf[len(magicChunk)+1] = uint8(chunkLen >> 0)
+		w.obuf[len(magicChunk)+2] = uint8(chunkLen >> 8)
+		w.obuf[len(magicChunk)+3] = uint8(chunkLen >> 16)
+		w.obuf[len(magicChunk)+4] = uint8(checksum >> 0)
+		w.obuf[len(magicChunk)+5] = uint8(checksum >> 8)
+		w.obuf[len(magicChunk)+6] = uint8(checksum >> 16)
+		w.obuf[len(magicChunk)+7] = uint8(checksum >> 24)
+
+		if _, err := w.w.Write(w.obuf[obufStart:obufEnd]); err != nil {
+			w.err = err
+			return nRet, err
+		}
+		if chunkType == chunkTypeUncompressedData {
+			if _, err := w.w.Write(uncompressed); err != nil {
+				w.err = err
+				return nRet, err
+			}
+		}
+		nRet += len(uncompressed)
+	}
+	return nRet, nil
+}
+
+// Flush flushes the Writer to its underlying io.Writer.
+func (w *Writer) Flush() error {
+	if w.err != nil {
+		return w.err
+	}
+	if len(w.ibuf) == 0 {
+		return nil
+	}
+	w.write(w.ibuf)
+	w.ibuf = w.ibuf[:0]
+	return w.err
+}
+
+// Close calls Flush and then closes the Writer.
+func (w *Writer) Close() error {
+	w.Flush()
+	ret := w.err
+	if w.err == nil {
+		w.err = errClosed
+	}
+	return ret
+}

vendor/github.com/golang/snappy/encode_amd64.s

@@ -0,0 +1,730 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The XXX lines assemble on Go 1.4, 1.5 and 1.7, but not 1.6, due to a
+// Go toolchain regression. See https://github.com/golang/go/issues/15426 and
+// https://github.com/golang/snappy/issues/29
+//
+// As a workaround, the package was built with a known good assembler, and
+// those instructions were disassembled by "objdump -d" to yield the
+//	4e 0f b7 7c 5c 78       movzwq 0x78(%rsp,%r11,2),%r15
+// style comments, in AT&T asm syntax. Note that rsp here is a physical
+// register, not Go/asm's SP pseudo-register (see https://golang.org/doc/asm).
+// The instructions were then encoded as "BYTE $0x.." sequences, which assemble
+// fine on Go 1.6.
+
+// The asm code generally follows the pure Go code in encode_other.go, except
+// where marked with a "!!!".
+
+// ----------------------------------------------------------------------------
+
+// func emitLiteral(dst, lit []byte) int
+//
+// All local variables fit into registers. The register allocation:
+//	- AX	len(lit)
+//	- BX	n
+//	- DX	return value
+//	- DI	&dst[i]
+//	- R10	&lit[0]
+//
+// The 24 bytes of stack space is to call runtime·memmove.
+//
+// The unusual register allocation of local variables, such as R10 for the
+// source pointer, matches the allocation used at the call site in encodeBlock,
+// which makes it easier to manually inline this function.
+TEXT ·emitLiteral(SB), NOSPLIT, $24-56
+	MOVQ dst_base+0(FP), DI
+	MOVQ lit_base+24(FP), R10
+	MOVQ lit_len+32(FP), AX
+	MOVQ AX, DX
+	MOVL AX, BX
+	SUBL $1, BX
+
+	CMPL BX, $60
+	JLT  oneByte
+	CMPL BX, $256
+	JLT  twoBytes
+
+threeBytes:
+	MOVB $0xf4, 0(DI)
+	MOVW BX, 1(DI)
+	ADDQ $3, DI
+	ADDQ $3, DX
+	JMP  memmove
+
+twoBytes:
+	MOVB $0xf0, 0(DI)
+	MOVB BX, 1(DI)
+	ADDQ $2, DI
+	ADDQ $2, DX
+	JMP  memmove
+
+oneByte:
+	SHLB $2, BX
+	MOVB BX, 0(DI)
+	ADDQ $1, DI
+	ADDQ $1, DX
+
+memmove:
+	MOVQ DX, ret+48(FP)
+
+	// copy(dst[i:], lit)
+	//
+	// This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+	// DI, R10 and AX as arguments.
+	MOVQ DI, 0(SP)
+	MOVQ R10, 8(SP)
+	MOVQ AX, 16(SP)
+	CALL runtime·memmove(SB)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func emitCopy(dst []byte, offset, length int) int
+//
+// All local variables fit into registers. The register allocation:
+//	- AX	length
+//	- SI	&dst[0]
+//	- DI	&dst[i]
+//	- R11	offset
+//
+// The unusual register allocation of local variables, such as R11 for the
+// offset, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·emitCopy(SB), NOSPLIT, $0-48
+	MOVQ dst_base+0(FP), DI
+	MOVQ DI, SI
+	MOVQ offset+24(FP), R11
+	MOVQ length+32(FP), AX
+
+loop0:
+	// for length >= 68 { etc }
+	CMPL AX, $68
+	JLT  step1
+
+	// Emit a length 64 copy, encoded as 3 bytes.
+	MOVB $0xfe, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+	SUBL $64, AX
+	JMP  loop0
+
+step1:
+	// if length > 64 { etc }
+	CMPL AX, $64
+	JLE  step2
+
+	// Emit a length 60 copy, encoded as 3 bytes.
+	MOVB $0xee, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+	SUBL $60, AX
+
+step2:
+	// if length >= 12 || offset >= 2048 { goto step3 }
+	CMPL AX, $12
+	JGE  step3
+	CMPL R11, $2048
+	JGE  step3
+
+	// Emit the remaining copy, encoded as 2 bytes.
+	MOVB R11, 1(DI)
+	SHRL $8, R11
+	SHLB $5, R11
+	SUBB $4, AX
+	SHLB $2, AX
+	ORB  AX, R11
+	ORB  $1, R11
+	MOVB R11, 0(DI)
+	ADDQ $2, DI
+
+	// Return the number of bytes written.
+	SUBQ SI, DI
+	MOVQ DI, ret+40(FP)
+	RET
+
+step3:
+	// Emit the remaining copy, encoded as 3 bytes.
+	SUBL $1, AX
+	SHLB $2, AX
+	ORB  $2, AX
+	MOVB AX, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+
+	// Return the number of bytes written.
+	SUBQ SI, DI
+	MOVQ DI, ret+40(FP)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func extendMatch(src []byte, i, j int) int
+//
+// All local variables fit into registers. The register allocation:
+//	- DX	&src[0]
+//	- SI	&src[j]
+//	- R13	&src[len(src) - 8]
+//	- R14	&src[len(src)]
+//	- R15	&src[i]
+//
+// The unusual register allocation of local variables, such as R15 for a source
+// pointer, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·extendMatch(SB), NOSPLIT, $0-48
+	MOVQ src_base+0(FP), DX
+	MOVQ src_len+8(FP), R14
+	MOVQ i+24(FP), R15
+	MOVQ j+32(FP), SI
+	ADDQ DX, R14
+	ADDQ DX, R15
+	ADDQ DX, SI
+	MOVQ R14, R13
+	SUBQ $8, R13
+
+cmp8:
+	// As long as we are 8 or more bytes before the end of src, we can load and
+	// compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+	CMPQ SI, R13
+	JA   cmp1
+	MOVQ (R15), AX
+	MOVQ (SI), BX
+	CMPQ AX, BX
+	JNE  bsf
+	ADDQ $8, R15
+	ADDQ $8, SI
+	JMP  cmp8
+
+bsf:
+	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
+	// the index of the first byte that differs. The BSF instruction finds the
+	// least significant 1 bit, the amd64 architecture is little-endian, and
+	// the shift by 3 converts a bit index to a byte index.
+	XORQ AX, BX
+	BSFQ BX, BX
+	SHRQ $3, BX
+	ADDQ BX, SI
+
+	// Convert from &src[ret] to ret.
+	SUBQ DX, SI
+	MOVQ SI, ret+40(FP)
+	RET
+
+cmp1:
+	// In src's tail, compare 1 byte at a time.
+	CMPQ SI, R14
+	JAE  extendMatchEnd
+	MOVB (R15), AX
+	MOVB (SI), BX
+	CMPB AX, BX
+	JNE  extendMatchEnd
+	ADDQ $1, R15
+	ADDQ $1, SI
+	JMP  cmp1
+
+extendMatchEnd:
+	// Convert from &src[ret] to ret.
+	SUBQ DX, SI
+	MOVQ SI, ret+40(FP)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func encodeBlock(dst, src []byte) (d int)
+//
+// All local variables fit into registers, other than "var table". The register
+// allocation:
+//	- AX	.	.
+//	- BX	.	.
+//	- CX	56	shift (note that amd64 shifts by non-immediates must use CX).
+//	- DX	64	&src[0], tableSize
+//	- SI	72	&src[s]
+//	- DI	80	&dst[d]
+//	- R9	88	sLimit
+//	- R10	.	&src[nextEmit]
+//	- R11	96	prevHash, currHash, nextHash, offset
+//	- R12	104	&src[base], skip
+//	- R13	.	&src[nextS], &src[len(src) - 8]
+//	- R14	.	len(src), bytesBetweenHashLookups, &src[len(src)], x
+//	- R15	112	candidate
+//
+// The second column (56, 64, etc) is the stack offset to spill the registers
+// when calling other functions. We could pack this slightly tighter, but it's
+// simpler to have a dedicated spill map independent of the function called.
+//
+// "var table [maxTableSize]uint16" takes up 32768 bytes of stack space. An
+// extra 56 bytes, to call other functions, and an extra 64 bytes, to spill
+// local variables (registers) during calls gives 32768 + 56 + 64 = 32888.
+TEXT ·encodeBlock(SB), 0, $32888-56
+	MOVQ dst_base+0(FP), DI
+	MOVQ src_base+24(FP), SI
+	MOVQ src_len+32(FP), R14
+
+	// shift, tableSize := uint32(32-8), 1<<8
+	MOVQ $24, CX
+	MOVQ $256, DX
+
+calcShift:
+	// for ; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+	//	shift--
+	// }
+	CMPQ DX, $16384
+	JGE  varTable
+	CMPQ DX, R14
+	JGE  varTable
+	SUBQ $1, CX
+	SHLQ $1, DX
+	JMP  calcShift
+
+varTable:
+	// var table [maxTableSize]uint16
+	//
+	// In the asm code, unlike the Go code, we can zero-initialize only the
+	// first tableSize elements. Each uint16 element is 2 bytes and each MOVOU
+	// writes 16 bytes, so we can do only tableSize/8 writes instead of the
+	// 2048 writes that would zero-initialize all of table's 32768 bytes.
+	SHRQ $3, DX
+	LEAQ table-32768(SP), BX
+	PXOR X0, X0
+
+memclr:
+	MOVOU X0, 0(BX)
+	ADDQ  $16, BX
+	SUBQ  $1, DX
+	JNZ   memclr
+
+	// !!! DX = &src[0]
+	MOVQ SI, DX
+
+	// sLimit := len(src) - inputMargin
+	MOVQ R14, R9
+	SUBQ $15, R9
+
+	// !!! Pre-emptively spill CX, DX and R9 to the stack. Their values don't
+	// change for the rest of the function.
+	MOVQ CX, 56(SP)
+	MOVQ DX, 64(SP)
+	MOVQ R9, 88(SP)
+
+	// nextEmit := 0
+	MOVQ DX, R10
+
+	// s := 1
+	ADDQ $1, SI
+
+	// nextHash := hash(load32(src, s), shift)
+	MOVL  0(SI), R11
+	IMULL $0x1e35a7bd, R11
+	SHRL  CX, R11
+
+outer:
+	// for { etc }
+
+	// skip := 32
+	MOVQ $32, R12
+
+	// nextS := s
+	MOVQ SI, R13
+
+	// candidate := 0
+	MOVQ $0, R15
+
+inner0:
+	// for { etc }
+
+	// s := nextS
+	MOVQ R13, SI
+
+	// bytesBetweenHashLookups := skip >> 5
+	MOVQ R12, R14
+	SHRQ $5, R14
+
+	// nextS = s + bytesBetweenHashLookups
+	ADDQ R14, R13
+
+	// skip += bytesBetweenHashLookups
+	ADDQ R14, R12
+
+	// if nextS > sLimit { goto emitRemainder }
+	MOVQ R13, AX
+	SUBQ DX, AX
+	CMPQ AX, R9
+	JA   emitRemainder
+
+	// candidate = int(table[nextHash])
+	// XXX: MOVWQZX table-32768(SP)(R11*2), R15
+	// XXX: 4e 0f b7 7c 5c 78       movzwq 0x78(%rsp,%r11,2),%r15
+	BYTE $0x4e
+	BYTE $0x0f
+	BYTE $0xb7
+	BYTE $0x7c
+	BYTE $0x5c
+	BYTE $0x78
+
+	// table[nextHash] = uint16(s)
+	MOVQ SI, AX
+	SUBQ DX, AX
+
+	// XXX: MOVW AX, table-32768(SP)(R11*2)
+	// XXX: 66 42 89 44 5c 78       mov    %ax,0x78(%rsp,%r11,2)
+	BYTE $0x66
+	BYTE $0x42
+	BYTE $0x89
+	BYTE $0x44
+	BYTE $0x5c
+	BYTE $0x78
+
+	// nextHash = hash(load32(src, nextS), shift)
+	MOVL  0(R13), R11
+	IMULL $0x1e35a7bd, R11
+	SHRL  CX, R11
+
+	// if load32(src, s) != load32(src, candidate) { continue } break
+	MOVL 0(SI), AX
+	MOVL (DX)(R15*1), BX
+	CMPL AX, BX
+	JNE  inner0
+
+fourByteMatch:
+	// As per the encode_other.go code:
+	//
+	// A 4-byte match has been found. We'll later see etc.
+
+	// !!! Jump to a fast path for short (<= 16 byte) literals. See the comment
+	// on inputMargin in encode.go.
+	MOVQ SI, AX
+	SUBQ R10, AX
+	CMPQ AX, $16
+	JLE  emitLiteralFastPath
+
+	// ----------------------------------------
+	// Begin inline of the emitLiteral call.
+	//
+	// d += emitLiteral(dst[d:], src[nextEmit:s])
+
+	MOVL AX, BX
+	SUBL $1, BX
+
+	CMPL BX, $60
+	JLT  inlineEmitLiteralOneByte
+	CMPL BX, $256
+	JLT  inlineEmitLiteralTwoBytes
+
+inlineEmitLiteralThreeBytes:
+	MOVB $0xf4, 0(DI)
+	MOVW BX, 1(DI)
+	ADDQ $3, DI
+	JMP  inlineEmitLiteralMemmove
+
+inlineEmitLiteralTwoBytes:
+	MOVB $0xf0, 0(DI)
+	MOVB BX, 1(DI)
+	ADDQ $2, DI
+	JMP  inlineEmitLiteralMemmove
+
+inlineEmitLiteralOneByte:
+	SHLB $2, BX
+	MOVB BX, 0(DI)
+	ADDQ $1, DI
+
+inlineEmitLiteralMemmove:
+	// Spill local variables (registers) onto the stack; call; unspill.
+	//
+	// copy(dst[i:], lit)
+	//
+	// This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+	// DI, R10 and AX as arguments.
+	MOVQ DI, 0(SP)
+	MOVQ R10, 8(SP)
+	MOVQ AX, 16(SP)
+	ADDQ AX, DI              // Finish the "d +=" part of "d += emitLiteral(etc)".
+	MOVQ SI, 72(SP)
+	MOVQ DI, 80(SP)
+	MOVQ R15, 112(SP)
+	CALL runtime·memmove(SB)
+	MOVQ 56(SP), CX
+	MOVQ 64(SP), DX
+	MOVQ 72(SP), SI
+	MOVQ 80(SP), DI
+	MOVQ 88(SP), R9
+	MOVQ 112(SP), R15
+	JMP  inner1
+
+inlineEmitLiteralEnd:
+	// End inline of the emitLiteral call.
+	// ----------------------------------------
+
+emitLiteralFastPath:
+	// !!! Emit the 1-byte encoding "uint8(len(lit)-1)<<2".
+	MOVB AX, BX
+	SUBB $1, BX
+	SHLB $2, BX
+	MOVB BX, (DI)
+	ADDQ $1, DI
+
+	// !!! Implement the copy from lit to dst as a 16-byte load and store.
+	// (Encode's documentation says that dst and src must not overlap.)
+	//
+	// This always copies 16 bytes, instead of only len(lit) bytes, but that's
+	// OK. Subsequent iterations will fix up the overrun.
+	//
+	// Note that on amd64, it is legal and cheap to issue unaligned 8-byte or
+	// 16-byte loads and stores. This technique probably wouldn't be as
+	// effective on architectures that are fussier about alignment.
+	MOVOU 0(R10), X0
+	MOVOU X0, 0(DI)
+	ADDQ  AX, DI
+
+inner1:
+	// for { etc }
+
+	// base := s
+	MOVQ SI, R12
+
+	// !!! offset := base - candidate
+	MOVQ R12, R11
+	SUBQ R15, R11
+	SUBQ DX, R11
+
+	// ----------------------------------------
+	// Begin inline of the extendMatch call.
+	//
+	// s = extendMatch(src, candidate+4, s+4)
+
+	// !!! R14 = &src[len(src)]
+	MOVQ src_len+32(FP), R14
+	ADDQ DX, R14
+
+	// !!! R13 = &src[len(src) - 8]
+	MOVQ R14, R13
+	SUBQ $8, R13
+
+	// !!! R15 = &src[candidate + 4]
+	ADDQ $4, R15
+	ADDQ DX, R15
+
+	// !!! s += 4
+	ADDQ $4, SI
+
+inlineExtendMatchCmp8:
+	// As long as we are 8 or more bytes before the end of src, we can load and
+	// compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+	CMPQ SI, R13
+	JA   inlineExtendMatchCmp1
+	MOVQ (R15), AX
+	MOVQ (SI), BX
+	CMPQ AX, BX
+	JNE  inlineExtendMatchBSF
+	ADDQ $8, R15
+	ADDQ $8, SI
+	JMP  inlineExtendMatchCmp8
+
+inlineExtendMatchBSF:
+	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
+	// the index of the first byte that differs. The BSF instruction finds the
+	// least significant 1 bit, the amd64 architecture is little-endian, and
+	// the shift by 3 converts a bit index to a byte index.
+	XORQ AX, BX
+	BSFQ BX, BX
+	SHRQ $3, BX
+	ADDQ BX, SI
+	JMP  inlineExtendMatchEnd
+
+inlineExtendMatchCmp1:
+	// In src's tail, compare 1 byte at a time.
+	CMPQ SI, R14
+	JAE  inlineExtendMatchEnd
+	MOVB (R15), AX
+	MOVB (SI), BX
+	CMPB AX, BX
+	JNE  inlineExtendMatchEnd
+	ADDQ $1, R15
+	ADDQ $1, SI
+	JMP  inlineExtendMatchCmp1
+
+inlineExtendMatchEnd:
+	// End inline of the extendMatch call.
+	// ----------------------------------------
+
+	// ----------------------------------------
+	// Begin inline of the emitCopy call.
+	//
+	// d += emitCopy(dst[d:], base-candidate, s-base)
+
+	// !!! length := s - base
+	MOVQ SI, AX
+	SUBQ R12, AX
+
+inlineEmitCopyLoop0:
+	// for length >= 68 { etc }
+	CMPL AX, $68
+	JLT  inlineEmitCopyStep1
+
+	// Emit a length 64 copy, encoded as 3 bytes.
+	MOVB $0xfe, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+	SUBL $64, AX
+	JMP  inlineEmitCopyLoop0
+
+inlineEmitCopyStep1:
+	// if length > 64 { etc }
+	CMPL AX, $64
+	JLE  inlineEmitCopyStep2
+
+	// Emit a length 60 copy, encoded as 3 bytes.
+	MOVB $0xee, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+	SUBL $60, AX
+
+inlineEmitCopyStep2:
+	// if length >= 12 || offset >= 2048 { goto inlineEmitCopyStep3 }
+	CMPL AX, $12
+	JGE  inlineEmitCopyStep3
+	CMPL R11, $2048
+	JGE  inlineEmitCopyStep3
+
+	// Emit the remaining copy, encoded as 2 bytes.
+	MOVB R11, 1(DI)
+	SHRL $8, R11
+	SHLB $5, R11
+	SUBB $4, AX
+	SHLB $2, AX
+	ORB  AX, R11
+	ORB  $1, R11
+	MOVB R11, 0(DI)
+	ADDQ $2, DI
+	JMP  inlineEmitCopyEnd
+
+inlineEmitCopyStep3:
+	// Emit the remaining copy, encoded as 3 bytes.
+	SUBL $1, AX
+	SHLB $2, AX
+	ORB  $2, AX
+	MOVB AX, 0(DI)
+	MOVW R11, 1(DI)
+	ADDQ $3, DI
+
+inlineEmitCopyEnd:
+	// End inline of the emitCopy call.
+	// ----------------------------------------
+
+	// nextEmit = s
+	MOVQ SI, R10
+
+	// if s >= sLimit { goto emitRemainder }
+	MOVQ SI, AX
+	SUBQ DX, AX
+	CMPQ AX, R9
+	JAE  emitRemainder
+
+	// As per the encode_other.go code:
+	//
+	// We could immediately etc.
+
+	// x := load64(src, s-1)
+	MOVQ -1(SI), R14
+
+	// prevHash := hash(uint32(x>>0), shift)
+	MOVL  R14, R11
+	IMULL $0x1e35a7bd, R11
+	SHRL  CX, R11
+
+	// table[prevHash] = uint16(s-1)
+	MOVQ SI, AX
+	SUBQ DX, AX
+	SUBQ $1, AX
+
+	// XXX: MOVW AX, table-32768(SP)(R11*2)
+	// XXX: 66 42 89 44 5c 78       mov    %ax,0x78(%rsp,%r11,2)
+	BYTE $0x66
+	BYTE $0x42
+	BYTE $0x89
+	BYTE $0x44
+	BYTE $0x5c
+	BYTE $0x78
+
+	// currHash := hash(uint32(x>>8), shift)
+	SHRQ  $8, R14
+	MOVL  R14, R11
+	IMULL $0x1e35a7bd, R11
+	SHRL  CX, R11
+
+	// candidate = int(table[currHash])
+	// XXX: MOVWQZX table-32768(SP)(R11*2), R15
+	// XXX: 4e 0f b7 7c 5c 78       movzwq 0x78(%rsp,%r11,2),%r15
+	BYTE $0x4e
+	BYTE $0x0f
+	BYTE $0xb7
+	BYTE $0x7c
+	BYTE $0x5c
+	BYTE $0x78
+
+	// table[currHash] = uint16(s)
+	ADDQ $1, AX
+
+	// XXX: MOVW AX, table-32768(SP)(R11*2)
+	// XXX: 66 42 89 44 5c 78       mov    %ax,0x78(%rsp,%r11,2)
+	BYTE $0x66
+	BYTE $0x42
+	BYTE $0x89
+	BYTE $0x44
+	BYTE $0x5c
+	BYTE $0x78
+
+	// if uint32(x>>8) == load32(src, candidate) { continue }
+	MOVL (DX)(R15*1), BX
+	CMPL R14, BX
+	JEQ  inner1
+
+	// nextHash = hash(uint32(x>>16), shift)
+	SHRQ  $8, R14
+	MOVL  R14, R11
+	IMULL $0x1e35a7bd, R11
+	SHRL  CX, R11
+
+	// s++
+	ADDQ $1, SI
+
+	// break out of the inner1 for loop, i.e. continue the outer loop.
+	JMP outer
+
+emitRemainder:
+	// if nextEmit < len(src) { etc }
+	MOVQ src_len+32(FP), AX
+	ADDQ DX, AX
+	CMPQ R10, AX
+	JEQ  encodeBlockEnd
+
+	// d += emitLiteral(dst[d:], src[nextEmit:])
+	//
+	// Push args.
+	MOVQ DI, 0(SP)
+	MOVQ $0, 8(SP)   // Unnecessary, as the callee ignores it, but conservative.
+	MOVQ $0, 16(SP)  // Unnecessary, as the callee ignores it, but conservative.
+	MOVQ R10, 24(SP)
+	SUBQ R10, AX
+	MOVQ AX, 32(SP)
+	MOVQ AX, 40(SP)  // Unnecessary, as the callee ignores it, but conservative.
+
+	// Spill local variables (registers) onto the stack; call; unspill.
+	MOVQ DI, 80(SP)
+	CALL ·emitLiteral(SB)
+	MOVQ 80(SP), DI
+
+	// Finish the "d +=" part of "d += emitLiteral(etc)".
+	ADDQ 48(SP), DI
+
+encodeBlockEnd:
+	MOVQ dst_base+0(FP), AX
+	SUBQ AX, DI
+	MOVQ DI, d+48(FP)
+	RET

vendor/github.com/golang/snappy/encode_arm64.s

@@ -0,0 +1,722 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// The asm code generally follows the pure Go code in encode_other.go, except
+// where marked with a "!!!".
+
+// ----------------------------------------------------------------------------
+
+// func emitLiteral(dst, lit []byte) int
+//
+// All local variables fit into registers. The register allocation:
+//	- R3	len(lit)
+//	- R4	n
+//	- R6	return value
+//	- R8	&dst[i]
+//	- R10	&lit[0]
+//
+// The 32 bytes of stack space is to call runtime·memmove.
+//
+// The unusual register allocation of local variables, such as R10 for the
+// source pointer, matches the allocation used at the call site in encodeBlock,
+// which makes it easier to manually inline this function.
+TEXT ·emitLiteral(SB), NOSPLIT, $32-56
+	MOVD dst_base+0(FP), R8
+	MOVD lit_base+24(FP), R10
+	MOVD lit_len+32(FP), R3
+	MOVD R3, R6
+	MOVW R3, R4
+	SUBW $1, R4, R4
+
+	CMPW $60, R4
+	BLT  oneByte
+	CMPW $256, R4
+	BLT  twoBytes
+
+threeBytes:
+	MOVD $0xf4, R2
+	MOVB R2, 0(R8)
+	MOVW R4, 1(R8)
+	ADD  $3, R8, R8
+	ADD  $3, R6, R6
+	B    memmove
+
+twoBytes:
+	MOVD $0xf0, R2
+	MOVB R2, 0(R8)
+	MOVB R4, 1(R8)
+	ADD  $2, R8, R8
+	ADD  $2, R6, R6
+	B    memmove
+
+oneByte:
+	LSLW $2, R4, R4
+	MOVB R4, 0(R8)
+	ADD  $1, R8, R8
+	ADD  $1, R6, R6
+
+memmove:
+	MOVD R6, ret+48(FP)
+
+	// copy(dst[i:], lit)
+	//
+	// This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+	// R8, R10 and R3 as arguments.
+	MOVD R8, 8(RSP)
+	MOVD R10, 16(RSP)
+	MOVD R3, 24(RSP)
+	CALL runtime·memmove(SB)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func emitCopy(dst []byte, offset, length int) int
+//
+// All local variables fit into registers. The register allocation:
+//	- R3	length
+//	- R7	&dst[0]
+//	- R8	&dst[i]
+//	- R11	offset
+//
+// The unusual register allocation of local variables, such as R11 for the
+// offset, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·emitCopy(SB), NOSPLIT, $0-48
+	MOVD dst_base+0(FP), R8
+	MOVD R8, R7
+	MOVD offset+24(FP), R11
+	MOVD length+32(FP), R3
+
+loop0:
+	// for length >= 68 { etc }
+	CMPW $68, R3
+	BLT  step1
+
+	// Emit a length 64 copy, encoded as 3 bytes.
+	MOVD $0xfe, R2
+	MOVB R2, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+	SUB  $64, R3, R3
+	B    loop0
+
+step1:
+	// if length > 64 { etc }
+	CMP $64, R3
+	BLE step2
+
+	// Emit a length 60 copy, encoded as 3 bytes.
+	MOVD $0xee, R2
+	MOVB R2, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+	SUB  $60, R3, R3
+
+step2:
+	// if length >= 12 || offset >= 2048 { goto step3 }
+	CMP  $12, R3
+	BGE  step3
+	CMPW $2048, R11
+	BGE  step3
+
+	// Emit the remaining copy, encoded as 2 bytes.
+	MOVB R11, 1(R8)
+	LSRW $3, R11, R11
+	AND  $0xe0, R11, R11
+	SUB  $4, R3, R3
+	LSLW $2, R3
+	AND  $0xff, R3, R3
+	ORRW R3, R11, R11
+	ORRW $1, R11, R11
+	MOVB R11, 0(R8)
+	ADD  $2, R8, R8
+
+	// Return the number of bytes written.
+	SUB  R7, R8, R8
+	MOVD R8, ret+40(FP)
+	RET
+
+step3:
+	// Emit the remaining copy, encoded as 3 bytes.
+	SUB  $1, R3, R3
+	AND  $0xff, R3, R3
+	LSLW $2, R3, R3
+	ORRW $2, R3, R3
+	MOVB R3, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+
+	// Return the number of bytes written.
+	SUB  R7, R8, R8
+	MOVD R8, ret+40(FP)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func extendMatch(src []byte, i, j int) int
+//
+// All local variables fit into registers. The register allocation:
+//	- R6	&src[0]
+//	- R7	&src[j]
+//	- R13	&src[len(src) - 8]
+//	- R14	&src[len(src)]
+//	- R15	&src[i]
+//
+// The unusual register allocation of local variables, such as R15 for a source
+// pointer, matches the allocation used at the call site in encodeBlock, which
+// makes it easier to manually inline this function.
+TEXT ·extendMatch(SB), NOSPLIT, $0-48
+	MOVD src_base+0(FP), R6
+	MOVD src_len+8(FP), R14
+	MOVD i+24(FP), R15
+	MOVD j+32(FP), R7
+	ADD  R6, R14, R14
+	ADD  R6, R15, R15
+	ADD  R6, R7, R7
+	MOVD R14, R13
+	SUB  $8, R13, R13
+
+cmp8:
+	// As long as we are 8 or more bytes before the end of src, we can load and
+	// compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+	CMP  R13, R7
+	BHI  cmp1
+	MOVD (R15), R3
+	MOVD (R7), R4
+	CMP  R4, R3
+	BNE  bsf
+	ADD  $8, R15, R15
+	ADD  $8, R7, R7
+	B    cmp8
+
+bsf:
+	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
+	// the index of the first byte that differs.
+	// RBIT reverses the bit order, then CLZ counts the leading zeros, the
+	// combination of which finds the least significant bit which is set.
+	// The arm64 architecture is little-endian, and the shift by 3 converts
+	// a bit index to a byte index.
+	EOR  R3, R4, R4
+	RBIT R4, R4
+	CLZ  R4, R4
+	ADD  R4>>3, R7, R7
+
+	// Convert from &src[ret] to ret.
+	SUB  R6, R7, R7
+	MOVD R7, ret+40(FP)
+	RET
+
+cmp1:
+	// In src's tail, compare 1 byte at a time.
+	CMP  R7, R14
+	BLS  extendMatchEnd
+	MOVB (R15), R3
+	MOVB (R7), R4
+	CMP  R4, R3
+	BNE  extendMatchEnd
+	ADD  $1, R15, R15
+	ADD  $1, R7, R7
+	B    cmp1
+
+extendMatchEnd:
+	// Convert from &src[ret] to ret.
+	SUB  R6, R7, R7
+	MOVD R7, ret+40(FP)
+	RET
+
+// ----------------------------------------------------------------------------
+
+// func encodeBlock(dst, src []byte) (d int)
+//
+// All local variables fit into registers, other than "var table". The register
+// allocation:
+//	- R3	.	.
+//	- R4	.	.
+//	- R5	64	shift
+//	- R6	72	&src[0], tableSize
+//	- R7	80	&src[s]
+//	- R8	88	&dst[d]
+//	- R9	96	sLimit
+//	- R10	.	&src[nextEmit]
+//	- R11	104	prevHash, currHash, nextHash, offset
+//	- R12	112	&src[base], skip
+//	- R13	.	&src[nextS], &src[len(src) - 8]
+//	- R14	.	len(src), bytesBetweenHashLookups, &src[len(src)], x
+//	- R15	120	candidate
+//	- R16	.	hash constant, 0x1e35a7bd
+//	- R17	.	&table
+//	- .  	128	table
+//
+// The second column (64, 72, etc) is the stack offset to spill the registers
+// when calling other functions. We could pack this slightly tighter, but it's
+// simpler to have a dedicated spill map independent of the function called.
+//
+// "var table [maxTableSize]uint16" takes up 32768 bytes of stack space. An
+// extra 64 bytes, to call other functions, and an extra 64 bytes, to spill
+// local variables (registers) during calls gives 32768 + 64 + 64 = 32896.
+TEXT ·encodeBlock(SB), 0, $32896-56
+	MOVD dst_base+0(FP), R8
+	MOVD src_base+24(FP), R7
+	MOVD src_len+32(FP), R14
+
+	// shift, tableSize := uint32(32-8), 1<<8
+	MOVD  $24, R5
+	MOVD  $256, R6
+	MOVW  $0xa7bd, R16
+	MOVKW $(0x1e35<<16), R16
+
+calcShift:
+	// for ; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+	//	shift--
+	// }
+	MOVD $16384, R2
+	CMP  R2, R6
+	BGE  varTable
+	CMP  R14, R6
+	BGE  varTable
+	SUB  $1, R5, R5
+	LSL  $1, R6, R6
+	B    calcShift
+
+varTable:
+	// var table [maxTableSize]uint16
+	//
+	// In the asm code, unlike the Go code, we can zero-initialize only the
+	// first tableSize elements. Each uint16 element is 2 bytes and each
+	// iterations writes 64 bytes, so we can do only tableSize/32 writes
+	// instead of the 2048 writes that would zero-initialize all of table's
+	// 32768 bytes. This clear could overrun the first tableSize elements, but
+	// it won't overrun the allocated stack size.
+	ADD  $128, RSP, R17
+	MOVD R17, R4
+
+	// !!! R6 = &src[tableSize]
+	ADD R6<<1, R17, R6
+
+memclr:
+	STP.P (ZR, ZR), 64(R4)
+	STP   (ZR, ZR), -48(R4)
+	STP   (ZR, ZR), -32(R4)
+	STP   (ZR, ZR), -16(R4)
+	CMP   R4, R6
+	BHI   memclr
+
+	// !!! R6 = &src[0]
+	MOVD R7, R6
+
+	// sLimit := len(src) - inputMargin
+	MOVD R14, R9
+	SUB  $15, R9, R9
+
+	// !!! Pre-emptively spill R5, R6 and R9 to the stack. Their values don't
+	// change for the rest of the function.
+	MOVD R5, 64(RSP)
+	MOVD R6, 72(RSP)
+	MOVD R9, 96(RSP)
+
+	// nextEmit := 0
+	MOVD R6, R10
+
+	// s := 1
+	ADD $1, R7, R7
+
+	// nextHash := hash(load32(src, s), shift)
+	MOVW 0(R7), R11
+	MULW R16, R11, R11
+	LSRW R5, R11, R11
+
+outer:
+	// for { etc }
+
+	// skip := 32
+	MOVD $32, R12
+
+	// nextS := s
+	MOVD R7, R13
+
+	// candidate := 0
+	MOVD $0, R15
+
+inner0:
+	// for { etc }
+
+	// s := nextS
+	MOVD R13, R7
+
+	// bytesBetweenHashLookups := skip >> 5
+	MOVD R12, R14
+	LSR  $5, R14, R14
+
+	// nextS = s + bytesBetweenHashLookups
+	ADD R14, R13, R13
+
+	// skip += bytesBetweenHashLookups
+	ADD R14, R12, R12
+
+	// if nextS > sLimit { goto emitRemainder }
+	MOVD R13, R3
+	SUB  R6, R3, R3
+	CMP  R9, R3
+	BHI  emitRemainder
+
+	// candidate = int(table[nextHash])
+	MOVHU 0(R17)(R11<<1), R15
+
+	// table[nextHash] = uint16(s)
+	MOVD R7, R3
+	SUB  R6, R3, R3
+
+	MOVH R3, 0(R17)(R11<<1)
+
+	// nextHash = hash(load32(src, nextS), shift)
+	MOVW 0(R13), R11
+	MULW R16, R11
+	LSRW R5, R11, R11
+
+	// if load32(src, s) != load32(src, candidate) { continue } break
+	MOVW 0(R7), R3
+	MOVW (R6)(R15), R4
+	CMPW R4, R3
+	BNE  inner0
+
+fourByteMatch:
+	// As per the encode_other.go code:
+	//
+	// A 4-byte match has been found. We'll later see etc.
+
+	// !!! Jump to a fast path for short (<= 16 byte) literals. See the comment
+	// on inputMargin in encode.go.
+	MOVD R7, R3
+	SUB  R10, R3, R3
+	CMP  $16, R3
+	BLE  emitLiteralFastPath
+
+	// ----------------------------------------
+	// Begin inline of the emitLiteral call.
+	//
+	// d += emitLiteral(dst[d:], src[nextEmit:s])
+
+	MOVW R3, R4
+	SUBW $1, R4, R4
+
+	MOVW $60, R2
+	CMPW R2, R4
+	BLT  inlineEmitLiteralOneByte
+	MOVW $256, R2
+	CMPW R2, R4
+	BLT  inlineEmitLiteralTwoBytes
+
+inlineEmitLiteralThreeBytes:
+	MOVD $0xf4, R1
+	MOVB R1, 0(R8)
+	MOVW R4, 1(R8)
+	ADD  $3, R8, R8
+	B    inlineEmitLiteralMemmove
+
+inlineEmitLiteralTwoBytes:
+	MOVD $0xf0, R1
+	MOVB R1, 0(R8)
+	MOVB R4, 1(R8)
+	ADD  $2, R8, R8
+	B    inlineEmitLiteralMemmove
+
+inlineEmitLiteralOneByte:
+	LSLW $2, R4, R4
+	MOVB R4, 0(R8)
+	ADD  $1, R8, R8
+
+inlineEmitLiteralMemmove:
+	// Spill local variables (registers) onto the stack; call; unspill.
+	//
+	// copy(dst[i:], lit)
+	//
+	// This means calling runtime·memmove(&dst[i], &lit[0], len(lit)), so we push
+	// R8, R10 and R3 as arguments.
+	MOVD R8, 8(RSP)
+	MOVD R10, 16(RSP)
+	MOVD R3, 24(RSP)
+
+	// Finish the "d +=" part of "d += emitLiteral(etc)".
+	ADD   R3, R8, R8
+	MOVD  R7, 80(RSP)
+	MOVD  R8, 88(RSP)
+	MOVD  R15, 120(RSP)
+	CALL  runtime·memmove(SB)
+	MOVD  64(RSP), R5
+	MOVD  72(RSP), R6
+	MOVD  80(RSP), R7
+	MOVD  88(RSP), R8
+	MOVD  96(RSP), R9
+	MOVD  120(RSP), R15
+	ADD   $128, RSP, R17
+	MOVW  $0xa7bd, R16
+	MOVKW $(0x1e35<<16), R16
+	B     inner1
+
+inlineEmitLiteralEnd:
+	// End inline of the emitLiteral call.
+	// ----------------------------------------
+
+emitLiteralFastPath:
+	// !!! Emit the 1-byte encoding "uint8(len(lit)-1)<<2".
+	MOVB R3, R4
+	SUBW $1, R4, R4
+	AND  $0xff, R4, R4
+	LSLW $2, R4, R4
+	MOVB R4, (R8)
+	ADD  $1, R8, R8
+
+	// !!! Implement the copy from lit to dst as a 16-byte load and store.
+	// (Encode's documentation says that dst and src must not overlap.)
+	//
+	// This always copies 16 bytes, instead of only len(lit) bytes, but that's
+	// OK. Subsequent iterations will fix up the overrun.
+	//
+	// Note that on arm64, it is legal and cheap to issue unaligned 8-byte or
+	// 16-byte loads and stores. This technique probably wouldn't be as
+	// effective on architectures that are fussier about alignment.
+	LDP 0(R10), (R0, R1)
+	STP (R0, R1), 0(R8)
+	ADD R3, R8, R8
+
+inner1:
+	// for { etc }
+
+	// base := s
+	MOVD R7, R12
+
+	// !!! offset := base - candidate
+	MOVD R12, R11
+	SUB  R15, R11, R11
+	SUB  R6, R11, R11
+
+	// ----------------------------------------
+	// Begin inline of the extendMatch call.
+	//
+	// s = extendMatch(src, candidate+4, s+4)
+
+	// !!! R14 = &src[len(src)]
+	MOVD src_len+32(FP), R14
+	ADD  R6, R14, R14
+
+	// !!! R13 = &src[len(src) - 8]
+	MOVD R14, R13
+	SUB  $8, R13, R13
+
+	// !!! R15 = &src[candidate + 4]
+	ADD $4, R15, R15
+	ADD R6, R15, R15
+
+	// !!! s += 4
+	ADD $4, R7, R7
+
+inlineExtendMatchCmp8:
+	// As long as we are 8 or more bytes before the end of src, we can load and
+	// compare 8 bytes at a time. If those 8 bytes are equal, repeat.
+	CMP  R13, R7
+	BHI  inlineExtendMatchCmp1
+	MOVD (R15), R3
+	MOVD (R7), R4
+	CMP  R4, R3
+	BNE  inlineExtendMatchBSF
+	ADD  $8, R15, R15
+	ADD  $8, R7, R7
+	B    inlineExtendMatchCmp8
+
+inlineExtendMatchBSF:
+	// If those 8 bytes were not equal, XOR the two 8 byte values, and return
+	// the index of the first byte that differs.
+	// RBIT reverses the bit order, then CLZ counts the leading zeros, the
+	// combination of which finds the least significant bit which is set.
+	// The arm64 architecture is little-endian, and the shift by 3 converts
+	// a bit index to a byte index.
+	EOR  R3, R4, R4
+	RBIT R4, R4
+	CLZ  R4, R4
+	ADD  R4>>3, R7, R7
+	B    inlineExtendMatchEnd
+
+inlineExtendMatchCmp1:
+	// In src's tail, compare 1 byte at a time.
+	CMP  R7, R14
+	BLS  inlineExtendMatchEnd
+	MOVB (R15), R3
+	MOVB (R7), R4
+	CMP  R4, R3
+	BNE  inlineExtendMatchEnd
+	ADD  $1, R15, R15
+	ADD  $1, R7, R7
+	B    inlineExtendMatchCmp1
+
+inlineExtendMatchEnd:
+	// End inline of the extendMatch call.
+	// ----------------------------------------
+
+	// ----------------------------------------
+	// Begin inline of the emitCopy call.
+	//
+	// d += emitCopy(dst[d:], base-candidate, s-base)
+
+	// !!! length := s - base
+	MOVD R7, R3
+	SUB  R12, R3, R3
+
+inlineEmitCopyLoop0:
+	// for length >= 68 { etc }
+	MOVW $68, R2
+	CMPW R2, R3
+	BLT  inlineEmitCopyStep1
+
+	// Emit a length 64 copy, encoded as 3 bytes.
+	MOVD $0xfe, R1
+	MOVB R1, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+	SUBW $64, R3, R3
+	B    inlineEmitCopyLoop0
+
+inlineEmitCopyStep1:
+	// if length > 64 { etc }
+	MOVW $64, R2
+	CMPW R2, R3
+	BLE  inlineEmitCopyStep2
+
+	// Emit a length 60 copy, encoded as 3 bytes.
+	MOVD $0xee, R1
+	MOVB R1, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+	SUBW $60, R3, R3
+
+inlineEmitCopyStep2:
+	// if length >= 12 || offset >= 2048 { goto inlineEmitCopyStep3 }
+	MOVW $12, R2
+	CMPW R2, R3
+	BGE  inlineEmitCopyStep3
+	MOVW $2048, R2
+	CMPW R2, R11
+	BGE  inlineEmitCopyStep3
+
+	// Emit the remaining copy, encoded as 2 bytes.
+	MOVB R11, 1(R8)
+	LSRW $8, R11, R11
+	LSLW $5, R11, R11
+	SUBW $4, R3, R3
+	AND  $0xff, R3, R3
+	LSLW $2, R3, R3
+	ORRW R3, R11, R11
+	ORRW $1, R11, R11
+	MOVB R11, 0(R8)
+	ADD  $2, R8, R8
+	B    inlineEmitCopyEnd
+
+inlineEmitCopyStep3:
+	// Emit the remaining copy, encoded as 3 bytes.
+	SUBW $1, R3, R3
+	LSLW $2, R3, R3
+	ORRW $2, R3, R3
+	MOVB R3, 0(R8)
+	MOVW R11, 1(R8)
+	ADD  $3, R8, R8
+
+inlineEmitCopyEnd:
+	// End inline of the emitCopy call.
+	// ----------------------------------------
+
+	// nextEmit = s
+	MOVD R7, R10
+
+	// if s >= sLimit { goto emitRemainder }
+	MOVD R7, R3
+	SUB  R6, R3, R3
+	CMP  R3, R9
+	BLS  emitRemainder
+
+	// As per the encode_other.go code:
+	//
+	// We could immediately etc.
+
+	// x := load64(src, s-1)
+	MOVD -1(R7), R14
+
+	// prevHash := hash(uint32(x>>0), shift)
+	MOVW R14, R11
+	MULW R16, R11, R11
+	LSRW R5, R11, R11
+
+	// table[prevHash] = uint16(s-1)
+	MOVD R7, R3
+	SUB  R6, R3, R3
+	SUB  $1, R3, R3
+
+	MOVHU R3, 0(R17)(R11<<1)
+
+	// currHash := hash(uint32(x>>8), shift)
+	LSR  $8, R14, R14
+	MOVW R14, R11
+	MULW R16, R11, R11
+	LSRW R5, R11, R11
+
+	// candidate = int(table[currHash])
+	MOVHU 0(R17)(R11<<1), R15
+
+	// table[currHash] = uint16(s)
+	ADD   $1, R3, R3
+	MOVHU R3, 0(R17)(R11<<1)
+
+	// if uint32(x>>8) == load32(src, candidate) { continue }
+	MOVW (R6)(R15), R4
+	CMPW R4, R14
+	BEQ  inner1
+
+	// nextHash = hash(uint32(x>>16), shift)
+	LSR  $8, R14, R14
+	MOVW R14, R11
+	MULW R16, R11, R11
+	LSRW R5, R11, R11
+
+	// s++
+	ADD $1, R7, R7
+
+	// break out of the inner1 for loop, i.e. continue the outer loop.
+	B outer
+
+emitRemainder:
+	// if nextEmit < len(src) { etc }
+	MOVD src_len+32(FP), R3
+	ADD  R6, R3, R3
+	CMP  R3, R10
+	BEQ  encodeBlockEnd
+
+	// d += emitLiteral(dst[d:], src[nextEmit:])
+	//
+	// Push args.
+	MOVD R8, 8(RSP)
+	MOVD $0, 16(RSP)  // Unnecessary, as the callee ignores it, but conservative.
+	MOVD $0, 24(RSP)  // Unnecessary, as the callee ignores it, but conservative.
+	MOVD R10, 32(RSP)
+	SUB  R10, R3, R3
+	MOVD R3, 40(RSP)
+	MOVD R3, 48(RSP)  // Unnecessary, as the callee ignores it, but conservative.
+
+	// Spill local variables (registers) onto the stack; call; unspill.
+	MOVD R8, 88(RSP)
+	CALL ·emitLiteral(SB)
+	MOVD 88(RSP), R8
+
+	// Finish the "d +=" part of "d += emitLiteral(etc)".
+	MOVD 56(RSP), R1
+	ADD  R1, R8, R8
+
+encodeBlockEnd:
+	MOVD dst_base+0(FP), R3
+	SUB  R3, R8, R8
+	MOVD R8, d+48(FP)
+	RET

vendor/github.com/golang/snappy/encode_asm.go

@@ -0,0 +1,30 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+// +build gc
+// +build !noasm
+// +build amd64 arm64
+
+package snappy
+
+// emitLiteral has the same semantics as in encode_other.go.
+//
+//go:noescape
+func emitLiteral(dst, lit []byte) int
+
+// emitCopy has the same semantics as in encode_other.go.
+//
+//go:noescape
+func emitCopy(dst []byte, offset, length int) int
+
+// extendMatch has the same semantics as in encode_other.go.
+//
+//go:noescape
+func extendMatch(src []byte, i, j int) int
+
+// encodeBlock has the same semantics as in encode_other.go.
+//
+//go:noescape
+func encodeBlock(dst, src []byte) (d int)

vendor/github.com/golang/snappy/encode_other.go

@@ -0,0 +1,238 @@
+// Copyright 2016 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !amd64,!arm64 appengine !gc noasm
+
+package snappy
+
+func load32(b []byte, i int) uint32 {
+	b = b[i : i+4 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+}
+
+func load64(b []byte, i int) uint64 {
+	b = b[i : i+8 : len(b)] // Help the compiler eliminate bounds checks on the next line.
+	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
+		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+}
+
+// emitLiteral writes a literal chunk and returns the number of bytes written.
+//
+// It assumes that:
+//	dst is long enough to hold the encoded bytes
+//	1 <= len(lit) && len(lit) <= 65536
+func emitLiteral(dst, lit []byte) int {
+	i, n := 0, uint(len(lit)-1)
+	switch {
+	case n < 60:
+		dst[0] = uint8(n)<<2 | tagLiteral
+		i = 1
+	case n < 1<<8:
+		dst[0] = 60<<2 | tagLiteral
+		dst[1] = uint8(n)
+		i = 2
+	default:
+		dst[0] = 61<<2 | tagLiteral
+		dst[1] = uint8(n)
+		dst[2] = uint8(n >> 8)
+		i = 3
+	}
+	return i + copy(dst[i:], lit)
+}
+
+// emitCopy writes a copy chunk and returns the number of bytes written.
+//
+// It assumes that:
+//	dst is long enough to hold the encoded bytes
+//	1 <= offset && offset <= 65535
+//	4 <= length && length <= 65535
+func emitCopy(dst []byte, offset, length int) int {
+	i := 0
+	// The maximum length for a single tagCopy1 or tagCopy2 op is 64 bytes. The
+	// threshold for this loop is a little higher (at 68 = 64 + 4), and the
+	// length emitted down below is is a little lower (at 60 = 64 - 4), because
+	// it's shorter to encode a length 67 copy as a length 60 tagCopy2 followed
+	// by a length 7 tagCopy1 (which encodes as 3+2 bytes) than to encode it as
+	// a length 64 tagCopy2 followed by a length 3 tagCopy2 (which encodes as
+	// 3+3 bytes). The magic 4 in the 64±4 is because the minimum length for a
+	// tagCopy1 op is 4 bytes, which is why a length 3 copy has to be an
+	// encodes-as-3-bytes tagCopy2 instead of an encodes-as-2-bytes tagCopy1.
+	for length >= 68 {
+		// Emit a length 64 copy, encoded as 3 bytes.
+		dst[i+0] = 63<<2 | tagCopy2
+		dst[i+1] = uint8(offset)
+		dst[i+2] = uint8(offset >> 8)
+		i += 3
+		length -= 64
+	}
+	if length > 64 {
+		// Emit a length 60 copy, encoded as 3 bytes.
+		dst[i+0] = 59<<2 | tagCopy2
+		dst[i+1] = uint8(offset)
+		dst[i+2] = uint8(offset >> 8)
+		i += 3
+		length -= 60
+	}
+	if length >= 12 || offset >= 2048 {
+		// Emit the remaining copy, encoded as 3 bytes.
+		dst[i+0] = uint8(length-1)<<2 | tagCopy2
+		dst[i+1] = uint8(offset)
+		dst[i+2] = uint8(offset >> 8)
+		return i + 3
+	}
+	// Emit the remaining copy, encoded as 2 bytes.
+	dst[i+0] = uint8(offset>>8)<<5 | uint8(length-4)<<2 | tagCopy1
+	dst[i+1] = uint8(offset)
+	return i + 2
+}
+
+// extendMatch returns the largest k such that k <= len(src) and that
+// src[i:i+k-j] and src[j:k] have the same contents.
+//
+// It assumes that:
+//	0 <= i && i < j && j <= len(src)
+func extendMatch(src []byte, i, j int) int {
+	for ; j < len(src) && src[i] == src[j]; i, j = i+1, j+1 {
+	}
+	return j
+}
+
+func hash(u, shift uint32) uint32 {
+	return (u * 0x1e35a7bd) >> shift
+}
+
+// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It
+// assumes that the varint-encoded length of the decompressed bytes has already
+// been written.
+//
+// It also assumes that:
+//	len(dst) >= MaxEncodedLen(len(src)) &&
+// 	minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
+func encodeBlock(dst, src []byte) (d int) {
+	// Initialize the hash table. Its size ranges from 1<<8 to 1<<14 inclusive.
+	// The table element type is uint16, as s < sLimit and sLimit < len(src)
+	// and len(src) <= maxBlockSize and maxBlockSize == 65536.
+	const (
+		maxTableSize = 1 << 14
+		// tableMask is redundant, but helps the compiler eliminate bounds
+		// checks.
+		tableMask = maxTableSize - 1
+	)
+	shift := uint32(32 - 8)
+	for tableSize := 1 << 8; tableSize < maxTableSize && tableSize < len(src); tableSize *= 2 {
+		shift--
+	}
+	// In Go, all array elements are zero-initialized, so there is no advantage
+	// to a smaller tableSize per se. However, it matches the C++ algorithm,
+	// and in the asm versions of this code, we can get away with zeroing only
+	// the first tableSize elements.
+	var table [maxTableSize]uint16
+
+	// sLimit is when to stop looking for offset/length copies. The inputMargin
+	// lets us use a fast path for emitLiteral in the main loop, while we are
+	// looking for copies.
+	sLimit := len(src) - inputMargin
+
+	// nextEmit is where in src the next emitLiteral should start from.
+	nextEmit := 0
+
+	// The encoded form must start with a literal, as there are no previous
+	// bytes to copy, so we start looking for hash matches at s == 1.
+	s := 1
+	nextHash := hash(load32(src, s), shift)
+
+	for {
+		// Copied from the C++ snappy implementation:
+		//
+		// Heuristic match skipping: If 32 bytes are scanned with no matches
+		// found, start looking only at every other byte. If 32 more bytes are
+		// scanned (or skipped), look at every third byte, etc.. When a match
+		// is found, immediately go back to looking at every byte. This is a
+		// small loss (~5% performance, ~0.1% density) for compressible data
+		// due to more bookkeeping, but for non-compressible data (such as
+		// JPEG) it's a huge win since the compressor quickly "realizes" the
+		// data is incompressible and doesn't bother looking for matches
+		// everywhere.
+		//
+		// The "skip" variable keeps track of how many bytes there are since
+		// the last match; dividing it by 32 (ie. right-shifting by five) gives
+		// the number of bytes to move ahead for each iteration.
+		skip := 32
+
+		nextS := s
+		candidate := 0
+		for {
+			s = nextS
+			bytesBetweenHashLookups := skip >> 5
+			nextS = s + bytesBetweenHashLookups
+			skip += bytesBetweenHashLookups
+			if nextS > sLimit {
+				goto emitRemainder
+			}
+			candidate = int(table[nextHash&tableMask])
+			table[nextHash&tableMask] = uint16(s)
+			nextHash = hash(load32(src, nextS), shift)
+			if load32(src, s) == load32(src, candidate) {
+				break
+			}
+		}
+
+		// A 4-byte match has been found. We'll later see if more than 4 bytes
+		// match. But, prior to the match, src[nextEmit:s] are unmatched. Emit
+		// them as literal bytes.
+		d += emitLiteral(dst[d:], src[nextEmit:s])
+
+		// Call emitCopy, and then see if another emitCopy could be our next
+		// move. Repeat until we find no match for the input immediately after
+		// what was consumed by the last emitCopy call.
+		//
+		// If we exit this loop normally then we need to call emitLiteral next,
+		// though we don't yet know how big the literal will be. We handle that
+		// by proceeding to the next iteration of the main loop. We also can
+		// exit this loop via goto if we get close to exhausting the input.
+		for {
+			// Invariant: we have a 4-byte match at s, and no need to emit any
+			// literal bytes prior to s.
+			base := s
+
+			// Extend the 4-byte match as long as possible.
+			//
+			// This is an inlined version of:
+			//	s = extendMatch(src, candidate+4, s+4)
+			s += 4
+			for i := candidate + 4; s < len(src) && src[i] == src[s]; i, s = i+1, s+1 {
+			}
+
+			d += emitCopy(dst[d:], base-candidate, s-base)
+			nextEmit = s
+			if s >= sLimit {
+				goto emitRemainder
+			}
+
+			// We could immediately start working at s now, but to improve
+			// compression we first update the hash table at s-1 and at s. If
+			// another emitCopy is not our next move, also calculate nextHash
+			// at s+1. At least on GOARCH=amd64, these three hash calculations
+			// are faster as one load64 call (with some shifts) instead of
+			// three load32 calls.
+			x := load64(src, s-1)
+			prevHash := hash(uint32(x>>0), shift)
+			table[prevHash&tableMask] = uint16(s - 1)
+			currHash := hash(uint32(x>>8), shift)
+			candidate = int(table[currHash&tableMask])
+			table[currHash&tableMask] = uint16(s)
+			if uint32(x>>8) != load32(src, candidate) {
+				nextHash = hash(uint32(x>>16), shift)
+				s++
+				break
+			}
+		}
+	}
+
+emitRemainder:
+	if nextEmit < len(src) {
+		d += emitLiteral(dst[d:], src[nextEmit:])
+	}
+	return d
+}

vendor/github.com/golang/snappy/snappy.go

@@ -0,0 +1,98 @@
+// Copyright 2011 The Snappy-Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package snappy implements the Snappy compression format. It aims for very
+// high speeds and reasonable compression.
+//
+// There are actually two Snappy formats: block and stream. They are related,
+// but different: trying to decompress block-compressed data as a Snappy stream
+// will fail, and vice versa. The block format is the Decode and Encode
+// functions and the stream format is the Reader and Writer types.
+//
+// The block format, the more common case, is used when the complete size (the
+// number of bytes) of the original data is known upfront, at the time
+// compression starts. The stream format, also known as the framing format, is
+// for when that isn't always true.
+//
+// The canonical, C++ implementation is at https://github.com/google/snappy and
+// it only implements the block format.
+package snappy // import "github.com/golang/snappy"
+
+import (
+	"hash/crc32"
+)
+
+/*
+Each encoded block begins with the varint-encoded length of the decoded data,
+followed by a sequence of chunks. Chunks begin and end on byte boundaries. The
+first byte of each chunk is broken into its 2 least and 6 most significant bits
+called l and m: l ranges in [0, 4) and m ranges in [0, 64). l is the chunk tag.
+Zero means a literal tag. All other values mean a copy tag.
+
+For literal tags:
+  - If m < 60, the next 1 + m bytes are literal bytes.
+  - Otherwise, let n be the little-endian unsigned integer denoted by the next
+    m - 59 bytes. The next 1 + n bytes after that are literal bytes.
+
+For copy tags, length bytes are copied from offset bytes ago, in the style of
+Lempel-Ziv compression algorithms. In particular:
+  - For l == 1, the offset ranges in [0, 1<<11) and the length in [4, 12).
+    The length is 4 + the low 3 bits of m. The high 3 bits of m form bits 8-10
+    of the offset. The next byte is bits 0-7 of the offset.
+  - For l == 2, the offset ranges in [0, 1<<16) and the length in [1, 65).
+    The length is 1 + m. The offset is the little-endian unsigned integer
+    denoted by the next 2 bytes.
+  - For l == 3, this tag is a legacy format that is no longer issued by most
+    encoders. Nonetheless, the offset ranges in [0, 1<<32) and the length in
+    [1, 65). The length is 1 + m. The offset is the little-endian unsigned
+    integer denoted by the next 4 bytes.
+*/
+const (
+	tagLiteral = 0x00
+	tagCopy1   = 0x01
+	tagCopy2   = 0x02
+	tagCopy4   = 0x03
+)
+
+const (
+	checksumSize    = 4
+	chunkHeaderSize = 4
+	magicChunk      = "\xff\x06\x00\x00" + magicBody
+	magicBody       = "sNaPpY"
+
+	// maxBlockSize is the maximum size of the input to encodeBlock. It is not
+	// part of the wire format per se, but some parts of the encoder assume
+	// that an offset fits into a uint16.
+	//
+	// Also, for the framing format (Writer type instead of Encode function),
+	// https://github.com/google/snappy/blob/master/framing_format.txt says
+	// that "the uncompressed data in a chunk must be no longer than 65536
+	// bytes".
+	maxBlockSize = 65536
+
+	// maxEncodedLenOfMaxBlockSize equals MaxEncodedLen(maxBlockSize), but is
+	// hard coded to be a const instead of a variable, so that obufLen can also
+	// be a const. Their equivalence is confirmed by
+	// TestMaxEncodedLenOfMaxBlockSize.
+	maxEncodedLenOfMaxBlockSize = 76490
+
+	obufHeaderLen = len(magicChunk) + checksumSize + chunkHeaderSize
+	obufLen       = obufHeaderLen + maxEncodedLenOfMaxBlockSize
+)
+
+const (
+	chunkTypeCompressedData   = 0x00
+	chunkTypeUncompressedData = 0x01
+	chunkTypePadding          = 0xfe
+	chunkTypeStreamIdentifier = 0xff
+)
+
+var crcTable = crc32.MakeTable(crc32.Castagnoli)
+
+// crc implements the checksum specified in section 3 of
+// https://github.com/google/snappy/blob/master/framing_format.txt
+func crc(b []byte) uint32 {
+	c := crc32.Update(0, crcTable, b)
+	return uint32(c>>15|c<<17) + 0xa282ead8
+}

vendor/github.com/google/uuid/.travis.yml

@@ -0,0 +1,9 @@
+language: go
+
+go:
+  - 1.4.3
+  - 1.5.3
+  - tip
+
+script:
+  - go test -v ./...

vendor/github.com/google/uuid/CONTRIBUTING.md

@@ -0,0 +1,10 @@
+# How to contribute
+
+We definitely welcome patches and contribution to this project!
+
+### Legal requirements
+
+In order to protect both you and ourselves, you will need to sign the
+[Contributor License Agreement](https://cla.developers.google.com/clas).
+
+You may have already signed it for other Google projects.

vendor/github.com/google/uuid/CONTRIBUTORS

@@ -0,0 +1,9 @@
+Paul Borman <borman@google.com>
+bmatsuo
+shawnps
+theory
+jboverfelt
+dsymonds
+cd1
+wallclockbuilder
+dansouza

vendor/github.com/google/uuid/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009,2014 Google Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/google/uuid/README.md

@@ -0,0 +1,19 @@
+# uuid ![build status](https://travis-ci.org/google/uuid.svg?branch=master)
+The uuid package generates and inspects UUIDs based on
+[RFC 4122](http://tools.ietf.org/html/rfc4122)
+and DCE 1.1: Authentication and Security Services. 
+
+This package is based on the github.com/pborman/uuid package (previously named
+code.google.com/p/go-uuid).  It differs from these earlier packages in that
+a UUID is a 16 byte array rather than a byte slice.  One loss due to this
+change is the ability to represent an invalid UUID (vs a NIL UUID).
+
+###### Install
+`go get github.com/google/uuid`
+
+###### Documentation 
+[![GoDoc](https://godoc.org/github.com/google/uuid?status.svg)](http://godoc.org/github.com/google/uuid)
+
+Full `go doc` style documentation for the package can be viewed online without
+installing this package by using the GoDoc site here: 
+http://pkg.go.dev/github.com/google/uuid

vendor/github.com/google/uuid/dce.go

@@ -0,0 +1,80 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+	"fmt"
+	"os"
+)
+
+// A Domain represents a Version 2 domain
+type Domain byte
+
+// Domain constants for DCE Security (Version 2) UUIDs.
+const (
+	Person = Domain(0)
+	Group  = Domain(1)
+	Org    = Domain(2)
+)
+
+// NewDCESecurity returns a DCE Security (Version 2) UUID.
+//
+// The domain should be one of Person, Group or Org.
+// On a POSIX system the id should be the users UID for the Person
+// domain and the users GID for the Group.  The meaning of id for
+// the domain Org or on non-POSIX systems is site defined.
+//
+// For a given domain/id pair the same token may be returned for up to
+// 7 minutes and 10 seconds.
+func NewDCESecurity(domain Domain, id uint32) (UUID, error) {
+	uuid, err := NewUUID()
+	if err == nil {
+		uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2
+		uuid[9] = byte(domain)
+		binary.BigEndian.PutUint32(uuid[0:], id)
+	}
+	return uuid, err
+}
+
+// NewDCEPerson returns a DCE Security (Version 2) UUID in the person
+// domain with the id returned by os.Getuid.
+//
+//  NewDCESecurity(Person, uint32(os.Getuid()))
+func NewDCEPerson() (UUID, error) {
+	return NewDCESecurity(Person, uint32(os.Getuid()))
+}
+
+// NewDCEGroup returns a DCE Security (Version 2) UUID in the group
+// domain with the id returned by os.Getgid.
+//
+//  NewDCESecurity(Group, uint32(os.Getgid()))
+func NewDCEGroup() (UUID, error) {
+	return NewDCESecurity(Group, uint32(os.Getgid()))
+}
+
+// Domain returns the domain for a Version 2 UUID.  Domains are only defined
+// for Version 2 UUIDs.
+func (uuid UUID) Domain() Domain {
+	return Domain(uuid[9])
+}
+
+// ID returns the id for a Version 2 UUID. IDs are only defined for Version 2
+// UUIDs.
+func (uuid UUID) ID() uint32 {
+	return binary.BigEndian.Uint32(uuid[0:4])
+}
+
+func (d Domain) String() string {
+	switch d {
+	case Person:
+		return "Person"
+	case Group:
+		return "Group"
+	case Org:
+		return "Org"
+	}
+	return fmt.Sprintf("Domain%d", int(d))
+}

vendor/github.com/google/uuid/doc.go

@@ -0,0 +1,12 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package uuid generates and inspects UUIDs.
+//
+// UUIDs are based on RFC 4122 and DCE 1.1: Authentication and Security
+// Services.
+//
+// A UUID is a 16 byte (128 bit) array.  UUIDs may be used as keys to
+// maps or compared directly.
+package uuid

vendor/github.com/google/uuid/hash.go

@@ -0,0 +1,53 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"crypto/md5"
+	"crypto/sha1"
+	"hash"
+)
+
+// Well known namespace IDs and UUIDs
+var (
+	NameSpaceDNS  = Must(Parse("6ba7b810-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceURL  = Must(Parse("6ba7b811-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceOID  = Must(Parse("6ba7b812-9dad-11d1-80b4-00c04fd430c8"))
+	NameSpaceX500 = Must(Parse("6ba7b814-9dad-11d1-80b4-00c04fd430c8"))
+	Nil           UUID // empty UUID, all zeros
+)
+
+// NewHash returns a new UUID derived from the hash of space concatenated with
+// data generated by h.  The hash should be at least 16 byte in length.  The
+// first 16 bytes of the hash are used to form the UUID.  The version of the
+// UUID will be the lower 4 bits of version.  NewHash is used to implement
+// NewMD5 and NewSHA1.
+func NewHash(h hash.Hash, space UUID, data []byte, version int) UUID {
+	h.Reset()
+	h.Write(space[:]) //nolint:errcheck
+	h.Write(data)     //nolint:errcheck
+	s := h.Sum(nil)
+	var uuid UUID
+	copy(uuid[:], s)
+	uuid[6] = (uuid[6] & 0x0f) | uint8((version&0xf)<<4)
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant
+	return uuid
+}
+
+// NewMD5 returns a new MD5 (Version 3) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(md5.New(), space, data, 3)
+func NewMD5(space UUID, data []byte) UUID {
+	return NewHash(md5.New(), space, data, 3)
+}
+
+// NewSHA1 returns a new SHA1 (Version 5) UUID based on the
+// supplied name space and data.  It is the same as calling:
+//
+//  NewHash(sha1.New(), space, data, 5)
+func NewSHA1(space UUID, data []byte) UUID {
+	return NewHash(sha1.New(), space, data, 5)
+}

vendor/github.com/google/uuid/marshal.go

@@ -0,0 +1,38 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "fmt"
+
+// MarshalText implements encoding.TextMarshaler.
+func (uuid UUID) MarshalText() ([]byte, error) {
+	var js [36]byte
+	encodeHex(js[:], uuid)
+	return js[:], nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (uuid *UUID) UnmarshalText(data []byte) error {
+	id, err := ParseBytes(data)
+	if err != nil {
+		return err
+	}
+	*uuid = id
+	return nil
+}
+
+// MarshalBinary implements encoding.BinaryMarshaler.
+func (uuid UUID) MarshalBinary() ([]byte, error) {
+	return uuid[:], nil
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler.
+func (uuid *UUID) UnmarshalBinary(data []byte) error {
+	if len(data) != 16 {
+		return fmt.Errorf("invalid UUID (got %d bytes)", len(data))
+	}
+	copy(uuid[:], data)
+	return nil
+}

vendor/github.com/google/uuid/node.go

@@ -0,0 +1,90 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"sync"
+)
+
+var (
+	nodeMu sync.Mutex
+	ifname string  // name of interface being used
+	nodeID [6]byte // hardware for version 1 UUIDs
+	zeroID [6]byte // nodeID with only 0's
+)
+
+// NodeInterface returns the name of the interface from which the NodeID was
+// derived.  The interface "user" is returned if the NodeID was set by
+// SetNodeID.
+func NodeInterface() string {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return ifname
+}
+
+// SetNodeInterface selects the hardware address to be used for Version 1 UUIDs.
+// If name is "" then the first usable interface found will be used or a random
+// Node ID will be generated.  If a named interface cannot be found then false
+// is returned.
+//
+// SetNodeInterface never fails when name is "".
+func SetNodeInterface(name string) bool {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	return setNodeInterface(name)
+}
+
+func setNodeInterface(name string) bool {
+	iname, addr := getHardwareInterface(name) // null implementation for js
+	if iname != "" && addr != nil {
+		ifname = iname
+		copy(nodeID[:], addr)
+		return true
+	}
+
+	// We found no interfaces with a valid hardware address.  If name
+	// does not specify a specific interface generate a random Node ID
+	// (section 4.1.6)
+	if name == "" {
+		ifname = "random"
+		randomBits(nodeID[:])
+		return true
+	}
+	return false
+}
+
+// NodeID returns a slice of a copy of the current Node ID, setting the Node ID
+// if not already set.
+func NodeID() []byte {
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	if nodeID == zeroID {
+		setNodeInterface("")
+	}
+	nid := nodeID
+	return nid[:]
+}
+
+// SetNodeID sets the Node ID to be used for Version 1 UUIDs.  The first 6 bytes
+// of id are used.  If id is less than 6 bytes then false is returned and the
+// Node ID is not set.
+func SetNodeID(id []byte) bool {
+	if len(id) < 6 {
+		return false
+	}
+	defer nodeMu.Unlock()
+	nodeMu.Lock()
+	copy(nodeID[:], id)
+	ifname = "user"
+	return true
+}
+
+// NodeID returns the 6 byte node id encoded in uuid.  It returns nil if uuid is
+// not valid.  The NodeID is only well defined for version 1 and 2 UUIDs.
+func (uuid UUID) NodeID() []byte {
+	var node [6]byte
+	copy(node[:], uuid[10:])
+	return node[:]
+}

vendor/github.com/google/uuid/node_js.go

@@ -0,0 +1,12 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build js
+
+package uuid
+
+// getHardwareInterface returns nil values for the JS version of the code.
+// This remvoves the "net" dependency, because it is not used in the browser.
+// Using the "net" library inflates the size of the transpiled JS code by 673k bytes.
+func getHardwareInterface(name string) (string, []byte) { return "", nil }

vendor/github.com/google/uuid/node_net.go

@@ -0,0 +1,33 @@
+// Copyright 2017 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !js
+
+package uuid
+
+import "net"
+
+var interfaces []net.Interface // cached list of interfaces
+
+// getHardwareInterface returns the name and hardware address of interface name.
+// If name is "" then the name and hardware address of one of the system's
+// interfaces is returned.  If no interfaces are found (name does not exist or
+// there are no interfaces) then "", nil is returned.
+//
+// Only addresses of at least 6 bytes are returned.
+func getHardwareInterface(name string) (string, []byte) {
+	if interfaces == nil {
+		var err error
+		interfaces, err = net.Interfaces()
+		if err != nil {
+			return "", nil
+		}
+	}
+	for _, ifs := range interfaces {
+		if len(ifs.HardwareAddr) >= 6 && (name == "" || name == ifs.Name) {
+			return ifs.Name, ifs.HardwareAddr
+		}
+	}
+	return "", nil
+}

vendor/github.com/google/uuid/null.go

@@ -0,0 +1,118 @@
+// Copyright 2021 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"bytes"
+	"database/sql/driver"
+	"encoding/json"
+	"fmt"
+)
+
+var jsonNull = []byte("null")
+
+// NullUUID represents a UUID that may be null.
+// NullUUID implements the SQL driver.Scanner interface so
+// it can be used as a scan destination:
+//
+//  var u uuid.NullUUID
+//  err := db.QueryRow("SELECT name FROM foo WHERE id=?", id).Scan(&u)
+//  ...
+//  if u.Valid {
+//     // use u.UUID
+//  } else {
+//     // NULL value
+//  }
+//
+type NullUUID struct {
+	UUID  UUID
+	Valid bool // Valid is true if UUID is not NULL
+}
+
+// Scan implements the SQL driver.Scanner interface.
+func (nu *NullUUID) Scan(value interface{}) error {
+	if value == nil {
+		nu.UUID, nu.Valid = Nil, false
+		return nil
+	}
+
+	err := nu.UUID.Scan(value)
+	if err != nil {
+		nu.Valid = false
+		return err
+	}
+
+	nu.Valid = true
+	return nil
+}
+
+// Value implements the driver Valuer interface.
+func (nu NullUUID) Value() (driver.Value, error) {
+	if !nu.Valid {
+		return nil, nil
+	}
+	// Delegate to UUID Value function
+	return nu.UUID.Value()
+}
+
+// MarshalBinary implements encoding.BinaryMarshaler.
+func (nu NullUUID) MarshalBinary() ([]byte, error) {
+	if nu.Valid {
+		return nu.UUID[:], nil
+	}
+
+	return []byte(nil), nil
+}
+
+// UnmarshalBinary implements encoding.BinaryUnmarshaler.
+func (nu *NullUUID) UnmarshalBinary(data []byte) error {
+	if len(data) != 16 {
+		return fmt.Errorf("invalid UUID (got %d bytes)", len(data))
+	}
+	copy(nu.UUID[:], data)
+	nu.Valid = true
+	return nil
+}
+
+// MarshalText implements encoding.TextMarshaler.
+func (nu NullUUID) MarshalText() ([]byte, error) {
+	if nu.Valid {
+		return nu.UUID.MarshalText()
+	}
+
+	return jsonNull, nil
+}
+
+// UnmarshalText implements encoding.TextUnmarshaler.
+func (nu *NullUUID) UnmarshalText(data []byte) error {
+	id, err := ParseBytes(data)
+	if err != nil {
+		nu.Valid = false
+		return err
+	}
+	nu.UUID = id
+	nu.Valid = true
+	return nil
+}
+
+// MarshalJSON implements json.Marshaler.
+func (nu NullUUID) MarshalJSON() ([]byte, error) {
+	if nu.Valid {
+		return json.Marshal(nu.UUID)
+	}
+
+	return jsonNull, nil
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (nu *NullUUID) UnmarshalJSON(data []byte) error {
+	if bytes.Equal(data, jsonNull) {
+		*nu = NullUUID{}
+		return nil // valid null UUID
+	}
+	err := json.Unmarshal(data, &nu.UUID)
+	nu.Valid = err == nil
+	return err
+}

vendor/github.com/google/uuid/sql.go

@@ -0,0 +1,59 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"database/sql/driver"
+	"fmt"
+)
+
+// Scan implements sql.Scanner so UUIDs can be read from databases transparently.
+// Currently, database types that map to string and []byte are supported. Please
+// consult database-specific driver documentation for matching types.
+func (uuid *UUID) Scan(src interface{}) error {
+	switch src := src.(type) {
+	case nil:
+		return nil
+
+	case string:
+		// if an empty UUID comes from a table, we return a null UUID
+		if src == "" {
+			return nil
+		}
+
+		// see Parse for required string format
+		u, err := Parse(src)
+		if err != nil {
+			return fmt.Errorf("Scan: %v", err)
+		}
+
+		*uuid = u
+
+	case []byte:
+		// if an empty UUID comes from a table, we return a null UUID
+		if len(src) == 0 {
+			return nil
+		}
+
+		// assumes a simple slice of bytes if 16 bytes
+		// otherwise attempts to parse
+		if len(src) != 16 {
+			return uuid.Scan(string(src))
+		}
+		copy((*uuid)[:], src)
+
+	default:
+		return fmt.Errorf("Scan: unable to scan type %T into UUID", src)
+	}
+
+	return nil
+}
+
+// Value implements sql.Valuer so that UUIDs can be written to databases
+// transparently. Currently, UUIDs map to strings. Please consult
+// database-specific driver documentation for matching types.
+func (uuid UUID) Value() (driver.Value, error) {
+	return uuid.String(), nil
+}

vendor/github.com/google/uuid/time.go

@@ -0,0 +1,123 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+	"sync"
+	"time"
+)
+
+// A Time represents a time as the number of 100's of nanoseconds since 15 Oct
+// 1582.
+type Time int64
+
+const (
+	lillian    = 2299160          // Julian day of 15 Oct 1582
+	unix       = 2440587          // Julian day of 1 Jan 1970
+	epoch      = unix - lillian   // Days between epochs
+	g1582      = epoch * 86400    // seconds between epochs
+	g1582ns100 = g1582 * 10000000 // 100s of a nanoseconds between epochs
+)
+
+var (
+	timeMu   sync.Mutex
+	lasttime uint64 // last time we returned
+	clockSeq uint16 // clock sequence for this run
+
+	timeNow = time.Now // for testing
+)
+
+// UnixTime converts t the number of seconds and nanoseconds using the Unix
+// epoch of 1 Jan 1970.
+func (t Time) UnixTime() (sec, nsec int64) {
+	sec = int64(t - g1582ns100)
+	nsec = (sec % 10000000) * 100
+	sec /= 10000000
+	return sec, nsec
+}
+
+// GetTime returns the current Time (100s of nanoseconds since 15 Oct 1582) and
+// clock sequence as well as adjusting the clock sequence as needed.  An error
+// is returned if the current time cannot be determined.
+func GetTime() (Time, uint16, error) {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	return getTime()
+}
+
+func getTime() (Time, uint16, error) {
+	t := timeNow()
+
+	// If we don't have a clock sequence already, set one.
+	if clockSeq == 0 {
+		setClockSequence(-1)
+	}
+	now := uint64(t.UnixNano()/100) + g1582ns100
+
+	// If time has gone backwards with this clock sequence then we
+	// increment the clock sequence
+	if now <= lasttime {
+		clockSeq = ((clockSeq + 1) & 0x3fff) | 0x8000
+	}
+	lasttime = now
+	return Time(now), clockSeq, nil
+}
+
+// ClockSequence returns the current clock sequence, generating one if not
+// already set.  The clock sequence is only used for Version 1 UUIDs.
+//
+// The uuid package does not use global static storage for the clock sequence or
+// the last time a UUID was generated.  Unless SetClockSequence is used, a new
+// random clock sequence is generated the first time a clock sequence is
+// requested by ClockSequence, GetTime, or NewUUID.  (section 4.2.1.1)
+func ClockSequence() int {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	return clockSequence()
+}
+
+func clockSequence() int {
+	if clockSeq == 0 {
+		setClockSequence(-1)
+	}
+	return int(clockSeq & 0x3fff)
+}
+
+// SetClockSequence sets the clock sequence to the lower 14 bits of seq.  Setting to
+// -1 causes a new sequence to be generated.
+func SetClockSequence(seq int) {
+	defer timeMu.Unlock()
+	timeMu.Lock()
+	setClockSequence(seq)
+}
+
+func setClockSequence(seq int) {
+	if seq == -1 {
+		var b [2]byte
+		randomBits(b[:]) // clock sequence
+		seq = int(b[0])<<8 | int(b[1])
+	}
+	oldSeq := clockSeq
+	clockSeq = uint16(seq&0x3fff) | 0x8000 // Set our variant
+	if oldSeq != clockSeq {
+		lasttime = 0
+	}
+}
+
+// Time returns the time in 100s of nanoseconds since 15 Oct 1582 encoded in
+// uuid.  The time is only defined for version 1 and 2 UUIDs.
+func (uuid UUID) Time() Time {
+	time := int64(binary.BigEndian.Uint32(uuid[0:4]))
+	time |= int64(binary.BigEndian.Uint16(uuid[4:6])) << 32
+	time |= int64(binary.BigEndian.Uint16(uuid[6:8])&0xfff) << 48
+	return Time(time)
+}
+
+// ClockSequence returns the clock sequence encoded in uuid.
+// The clock sequence is only well defined for version 1 and 2 UUIDs.
+func (uuid UUID) ClockSequence() int {
+	return int(binary.BigEndian.Uint16(uuid[8:10])) & 0x3fff
+}

vendor/github.com/google/uuid/util.go

@@ -0,0 +1,43 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"io"
+)
+
+// randomBits completely fills slice b with random data.
+func randomBits(b []byte) {
+	if _, err := io.ReadFull(rander, b); err != nil {
+		panic(err.Error()) // rand should never fail
+	}
+}
+
+// xvalues returns the value of a byte as a hexadecimal digit or 255.
+var xvalues = [256]byte{
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255, 255, 255, 255,
+	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+}
+
+// xtob converts hex characters x1 and x2 into a byte.
+func xtob(x1, x2 byte) (byte, bool) {
+	b1 := xvalues[x1]
+	b2 := xvalues[x2]
+	return (b1 << 4) | b2, b1 != 255 && b2 != 255
+}

vendor/github.com/google/uuid/uuid.go

@@ -0,0 +1,294 @@
+// Copyright 2018 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"strings"
+	"sync"
+)
+
+// A UUID is a 128 bit (16 byte) Universal Unique IDentifier as defined in RFC
+// 4122.
+type UUID [16]byte
+
+// A Version represents a UUID's version.
+type Version byte
+
+// A Variant represents a UUID's variant.
+type Variant byte
+
+// Constants returned by Variant.
+const (
+	Invalid   = Variant(iota) // Invalid UUID
+	RFC4122                   // The variant specified in RFC4122
+	Reserved                  // Reserved, NCS backward compatibility.
+	Microsoft                 // Reserved, Microsoft Corporation backward compatibility.
+	Future                    // Reserved for future definition.
+)
+
+const randPoolSize = 16 * 16
+
+var (
+	rander      = rand.Reader // random function
+	poolEnabled = false
+	poolMu      sync.Mutex
+	poolPos     = randPoolSize     // protected with poolMu
+	pool        [randPoolSize]byte // protected with poolMu
+)
+
+type invalidLengthError struct{ len int }
+
+func (err invalidLengthError) Error() string {
+	return fmt.Sprintf("invalid UUID length: %d", err.len)
+}
+
+// IsInvalidLengthError is matcher function for custom error invalidLengthError
+func IsInvalidLengthError(err error) bool {
+	_, ok := err.(invalidLengthError)
+	return ok
+}
+
+// Parse decodes s into a UUID or returns an error.  Both the standard UUID
+// forms of xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx and
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx are decoded as well as the
+// Microsoft encoding {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} and the raw hex
+// encoding: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
+func Parse(s string) (UUID, error) {
+	var uuid UUID
+	switch len(s) {
+	// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36:
+
+	// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36 + 9:
+		if strings.ToLower(s[:9]) != "urn:uuid:" {
+			return uuid, fmt.Errorf("invalid urn prefix: %q", s[:9])
+		}
+		s = s[9:]
+
+	// {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+	case 36 + 2:
+		s = s[1:]
+
+	// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+	case 32:
+		var ok bool
+		for i := range uuid {
+			uuid[i], ok = xtob(s[i*2], s[i*2+1])
+			if !ok {
+				return uuid, errors.New("invalid UUID format")
+			}
+		}
+		return uuid, nil
+	default:
+		return uuid, invalidLengthError{len(s)}
+	}
+	// s is now at least 36 bytes long
+	// it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
+		return uuid, errors.New("invalid UUID format")
+	}
+	for i, x := range [16]int{
+		0, 2, 4, 6,
+		9, 11,
+		14, 16,
+		19, 21,
+		24, 26, 28, 30, 32, 34} {
+		v, ok := xtob(s[x], s[x+1])
+		if !ok {
+			return uuid, errors.New("invalid UUID format")
+		}
+		uuid[i] = v
+	}
+	return uuid, nil
+}
+
+// ParseBytes is like Parse, except it parses a byte slice instead of a string.
+func ParseBytes(b []byte) (UUID, error) {
+	var uuid UUID
+	switch len(b) {
+	case 36: // xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	case 36 + 9: // urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+		if !bytes.Equal(bytes.ToLower(b[:9]), []byte("urn:uuid:")) {
+			return uuid, fmt.Errorf("invalid urn prefix: %q", b[:9])
+		}
+		b = b[9:]
+	case 36 + 2: // {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
+		b = b[1:]
+	case 32: // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+		var ok bool
+		for i := 0; i < 32; i += 2 {
+			uuid[i/2], ok = xtob(b[i], b[i+1])
+			if !ok {
+				return uuid, errors.New("invalid UUID format")
+			}
+		}
+		return uuid, nil
+	default:
+		return uuid, invalidLengthError{len(b)}
+	}
+	// s is now at least 36 bytes long
+	// it must be of the form  xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+	if b[8] != '-' || b[13] != '-' || b[18] != '-' || b[23] != '-' {
+		return uuid, errors.New("invalid UUID format")
+	}
+	for i, x := range [16]int{
+		0, 2, 4, 6,
+		9, 11,
+		14, 16,
+		19, 21,
+		24, 26, 28, 30, 32, 34} {
+		v, ok := xtob(b[x], b[x+1])
+		if !ok {
+			return uuid, errors.New("invalid UUID format")
+		}
+		uuid[i] = v
+	}
+	return uuid, nil
+}
+
+// MustParse is like Parse but panics if the string cannot be parsed.
+// It simplifies safe initialization of global variables holding compiled UUIDs.
+func MustParse(s string) UUID {
+	uuid, err := Parse(s)
+	if err != nil {
+		panic(`uuid: Parse(` + s + `): ` + err.Error())
+	}
+	return uuid
+}
+
+// FromBytes creates a new UUID from a byte slice. Returns an error if the slice
+// does not have a length of 16. The bytes are copied from the slice.
+func FromBytes(b []byte) (uuid UUID, err error) {
+	err = uuid.UnmarshalBinary(b)
+	return uuid, err
+}
+
+// Must returns uuid if err is nil and panics otherwise.
+func Must(uuid UUID, err error) UUID {
+	if err != nil {
+		panic(err)
+	}
+	return uuid
+}
+
+// String returns the string form of uuid, xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+// , or "" if uuid is invalid.
+func (uuid UUID) String() string {
+	var buf [36]byte
+	encodeHex(buf[:], uuid)
+	return string(buf[:])
+}
+
+// URN returns the RFC 2141 URN form of uuid,
+// urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,  or "" if uuid is invalid.
+func (uuid UUID) URN() string {
+	var buf [36 + 9]byte
+	copy(buf[:], "urn:uuid:")
+	encodeHex(buf[9:], uuid)
+	return string(buf[:])
+}
+
+func encodeHex(dst []byte, uuid UUID) {
+	hex.Encode(dst, uuid[:4])
+	dst[8] = '-'
+	hex.Encode(dst[9:13], uuid[4:6])
+	dst[13] = '-'
+	hex.Encode(dst[14:18], uuid[6:8])
+	dst[18] = '-'
+	hex.Encode(dst[19:23], uuid[8:10])
+	dst[23] = '-'
+	hex.Encode(dst[24:], uuid[10:])
+}
+
+// Variant returns the variant encoded in uuid.
+func (uuid UUID) Variant() Variant {
+	switch {
+	case (uuid[8] & 0xc0) == 0x80:
+		return RFC4122
+	case (uuid[8] & 0xe0) == 0xc0:
+		return Microsoft
+	case (uuid[8] & 0xe0) == 0xe0:
+		return Future
+	default:
+		return Reserved
+	}
+}
+
+// Version returns the version of uuid.
+func (uuid UUID) Version() Version {
+	return Version(uuid[6] >> 4)
+}
+
+func (v Version) String() string {
+	if v > 15 {
+		return fmt.Sprintf("BAD_VERSION_%d", v)
+	}
+	return fmt.Sprintf("VERSION_%d", v)
+}
+
+func (v Variant) String() string {
+	switch v {
+	case RFC4122:
+		return "RFC4122"
+	case Reserved:
+		return "Reserved"
+	case Microsoft:
+		return "Microsoft"
+	case Future:
+		return "Future"
+	case Invalid:
+		return "Invalid"
+	}
+	return fmt.Sprintf("BadVariant%d", int(v))
+}
+
+// SetRand sets the random number generator to r, which implements io.Reader.
+// If r.Read returns an error when the package requests random data then
+// a panic will be issued.
+//
+// Calling SetRand with nil sets the random number generator to the default
+// generator.
+func SetRand(r io.Reader) {
+	if r == nil {
+		rander = rand.Reader
+		return
+	}
+	rander = r
+}
+
+// EnableRandPool enables internal randomness pool used for Random
+// (Version 4) UUID generation. The pool contains random bytes read from
+// the random number generator on demand in batches. Enabling the pool
+// may improve the UUID generation throughput significantly.
+//
+// Since the pool is stored on the Go heap, this feature may be a bad fit
+// for security sensitive applications.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func EnableRandPool() {
+	poolEnabled = true
+}
+
+// DisableRandPool disables the randomness pool if it was previously
+// enabled with EnableRandPool.
+//
+// Both EnableRandPool and DisableRandPool are not thread-safe and should
+// only be called when there is no possibility that New or any other
+// UUID Version 4 generation function will be called concurrently.
+func DisableRandPool() {
+	poolEnabled = false
+	defer poolMu.Unlock()
+	poolMu.Lock()
+	poolPos = randPoolSize
+}

vendor/github.com/google/uuid/version1.go

@@ -0,0 +1,44 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import (
+	"encoding/binary"
+)
+
+// NewUUID returns a Version 1 UUID based on the current NodeID and clock
+// sequence, and the current time.  If the NodeID has not been set by SetNodeID
+// or SetNodeInterface then it will be set automatically.  If the NodeID cannot
+// be set NewUUID returns nil.  If clock sequence has not been set by
+// SetClockSequence then it will be set automatically.  If GetTime fails to
+// return the current NewUUID returns nil and an error.
+//
+// In most cases, New should be used.
+func NewUUID() (UUID, error) {
+	var uuid UUID
+	now, seq, err := GetTime()
+	if err != nil {
+		return uuid, err
+	}
+
+	timeLow := uint32(now & 0xffffffff)
+	timeMid := uint16((now >> 32) & 0xffff)
+	timeHi := uint16((now >> 48) & 0x0fff)
+	timeHi |= 0x1000 // Version 1
+
+	binary.BigEndian.PutUint32(uuid[0:], timeLow)
+	binary.BigEndian.PutUint16(uuid[4:], timeMid)
+	binary.BigEndian.PutUint16(uuid[6:], timeHi)
+	binary.BigEndian.PutUint16(uuid[8:], seq)
+
+	nodeMu.Lock()
+	if nodeID == zeroID {
+		setNodeInterface("")
+	}
+	copy(uuid[10:], nodeID[:])
+	nodeMu.Unlock()
+
+	return uuid, nil
+}

vendor/github.com/google/uuid/version4.go

@@ -0,0 +1,76 @@
+// Copyright 2016 Google Inc.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+import "io"
+
+// New creates a new random UUID or panics.  New is equivalent to
+// the expression
+//
+//    uuid.Must(uuid.NewRandom())
+func New() UUID {
+	return Must(NewRandom())
+}
+
+// NewString creates a new random UUID and returns it as a string or panics.
+// NewString is equivalent to the expression
+//
+//    uuid.New().String()
+func NewString() string {
+	return Must(NewRandom()).String()
+}
+
+// NewRandom returns a Random (Version 4) UUID.
+//
+// The strength of the UUIDs is based on the strength of the crypto/rand
+// package.
+//
+// Uses the randomness pool if it was enabled with EnableRandPool.
+//
+// A note about uniqueness derived from the UUID Wikipedia entry:
+//
+//  Randomly generated UUIDs have 122 random bits.  One's annual risk of being
+//  hit by a meteorite is estimated to be one chance in 17 billion, that
+//  means the probability is about 0.00000000006 (6 × 10−11),
+//  equivalent to the odds of creating a few tens of trillions of UUIDs in a
+//  year and having one duplicate.
+func NewRandom() (UUID, error) {
+	if !poolEnabled {
+		return NewRandomFromReader(rander)
+	}
+	return newRandomFromPool()
+}
+
+// NewRandomFromReader returns a UUID based on bytes read from a given io.Reader.
+func NewRandomFromReader(r io.Reader) (UUID, error) {
+	var uuid UUID
+	_, err := io.ReadFull(r, uuid[:])
+	if err != nil {
+		return Nil, err
+	}
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	return uuid, nil
+}
+
+func newRandomFromPool() (UUID, error) {
+	var uuid UUID
+	poolMu.Lock()
+	if poolPos == randPoolSize {
+		_, err := io.ReadFull(rander, pool[:])
+		if err != nil {
+			poolMu.Unlock()
+			return Nil, err
+		}
+		poolPos = 0
+	}
+	copy(uuid[:], pool[poolPos:(poolPos+16)])
+	poolPos += 16
+	poolMu.Unlock()
+
+	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+	uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+	return uuid, nil
+}

vendor/github.com/klauspost/compress/.gitattributes

@@ -0,0 +1,2 @@
+* -text
+*.bin -text -diff

vendor/github.com/klauspost/compress/.gitignore

@@ -0,0 +1,25 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof
+/s2/cmd/_s2sx/sfx-exe