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// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package options // import "go.mongodb.org/mongo-driver/mongo/options"
import (
"bytes"
"context"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"net"
"strings"
"time"
"github.com/youmark/pkcs8"
"go.mongodb.org/mongo-driver/bson/bsoncodec"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/internal"
"go.mongodb.org/mongo-driver/mongo/readconcern"
"go.mongodb.org/mongo-driver/mongo/readpref"
"go.mongodb.org/mongo-driver/mongo/writeconcern"
"go.mongodb.org/mongo-driver/tag"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/connstring"
"go.mongodb.org/mongo-driver/x/mongo/driver/wiremessage"
)
// ContextDialer is an interface that can be implemented by types that can create connections. It should be used to
// provide a custom dialer when configuring a Client.
//
// DialContext should return a connection to the provided address on the given network.
type ContextDialer interface {
DialContext(ctx context.Context, network, address string) (net.Conn, error)
}
// Credential can be used to provide authentication options when configuring a Client.
//
// AuthMechanism: the mechanism to use for authentication. Supported values include "SCRAM-SHA-256", "SCRAM-SHA-1",
// "MONGODB-CR", "PLAIN", "GSSAPI", "MONGODB-X509", and "MONGODB-AWS". This can also be set through the "authMechanism"
// URI option. (e.g. "authMechanism=PLAIN"). For more information, see
// https://docs.mongodb.com/manual/core/authentication-mechanisms/.
//
// AuthMechanismProperties can be used to specify additional configuration options for certain mechanisms. They can also
// be set through the "authMechanismProperites" URI option
// (e.g. "authMechanismProperties=SERVICE_NAME:service,CANONICALIZE_HOST_NAME:true"). Supported properties are:
//
// 1. SERVICE_NAME: The service name to use for GSSAPI authentication. The default is "mongodb".
//
// 2. CANONICALIZE_HOST_NAME: If "true", the driver will canonicalize the host name for GSSAPI authentication. The default
// is "false".
//
// 3. SERVICE_REALM: The service realm for GSSAPI authentication.
//
// 4. SERVICE_HOST: The host name to use for GSSAPI authentication. This should be specified if the host name to use for
// authentication is different than the one given for Client construction.
//
// 4. AWS_SESSION_TOKEN: The AWS token for MONGODB-AWS authentication. This is optional and used for authentication with
// temporary credentials.
//
// The SERVICE_HOST and CANONICALIZE_HOST_NAME properties must not be used at the same time on Linux and Darwin
// systems.
//
// AuthSource: the name of the database to use for authentication. This defaults to "$external" for MONGODB-X509,
// GSSAPI, and PLAIN and "admin" for all other mechanisms. This can also be set through the "authSource" URI option
// (e.g. "authSource=otherDb").
//
// Username: the username for authentication. This can also be set through the URI as a username:password pair before
// the first @ character. For example, a URI for user "user", password "pwd", and host "localhost:27017" would be
// "mongodb://user:pwd@localhost:27017". This is optional for X509 authentication and will be extracted from the
// client certificate if not specified.
//
// Password: the password for authentication. This must not be specified for X509 and is optional for GSSAPI
// authentication.
//
// PasswordSet: For GSSAPI, this must be true if a password is specified, even if the password is the empty string, and
// false if no password is specified, indicating that the password should be taken from the context of the running
// process. For other mechanisms, this field is ignored.
type Credential struct {
AuthMechanism string
AuthMechanismProperties map[string]string
AuthSource string
Username string
Password string
PasswordSet bool
}
// ClientOptions contains options to configure a Client instance. Each option can be set through setter functions. See
// documentation for each setter function for an explanation of the option.
type ClientOptions struct {
AppName *string
Auth *Credential
AutoEncryptionOptions *AutoEncryptionOptions
ConnectTimeout *time.Duration
Compressors []string
Dialer ContextDialer
Direct *bool
DisableOCSPEndpointCheck *bool
HeartbeatInterval *time.Duration
Hosts []string
LoadBalanced *bool
LocalThreshold *time.Duration
MaxConnIdleTime *time.Duration
MaxPoolSize *uint64
MinPoolSize *uint64
MaxConnecting *uint64
PoolMonitor *event.PoolMonitor
Monitor *event.CommandMonitor
ServerMonitor *event.ServerMonitor
ReadConcern *readconcern.ReadConcern
ReadPreference *readpref.ReadPref
Registry *bsoncodec.Registry
ReplicaSet *string
RetryReads *bool
RetryWrites *bool
ServerAPIOptions *ServerAPIOptions
ServerSelectionTimeout *time.Duration
SocketTimeout *time.Duration
SRVMaxHosts *int
SRVServiceName *string
TLSConfig *tls.Config
WriteConcern *writeconcern.WriteConcern
ZlibLevel *int
ZstdLevel *int
err error
uri string
cs *connstring.ConnString
// AuthenticateToAnything skips server type checks when deciding if authentication is possible.
//
// Deprecated: This option is for internal use only and should not be set. It may be changed or removed in any
// release.
AuthenticateToAnything *bool
// Crypt specifies a custom driver.Crypt to be used to encrypt and decrypt documents. The default is no
// encryption.
//
// Deprecated: This option is for internal use only and should not be set (see GODRIVER-2149). It may be
// changed or removed in any release.
Crypt driver.Crypt
// Deployment specifies a custom deployment to use for the new Client.
//
// Deprecated: This option is for internal use only and should not be set. It may be changed or removed in any
// release.
Deployment driver.Deployment
}
// Client creates a new ClientOptions instance.
func Client() *ClientOptions {
return new(ClientOptions)
}
// Validate validates the client options. This method will return the first error found.
func (c *ClientOptions) Validate() error {
c.validateAndSetError()
return c.err
}
func (c *ClientOptions) validateAndSetError() {
if c.err != nil {
return
}
// Direct connections cannot be made if multiple hosts are specified or an SRV URI is used.
if c.Direct != nil && *c.Direct {
if len(c.Hosts) > 1 {
c.err = errors.New("a direct connection cannot be made if multiple hosts are specified")
return
}
if c.cs != nil && c.cs.Scheme == connstring.SchemeMongoDBSRV {
c.err = errors.New("a direct connection cannot be made if an SRV URI is used")
return
}
}
// verify server API version if ServerAPIOptions are passed in.
if c.ServerAPIOptions != nil {
c.err = c.ServerAPIOptions.ServerAPIVersion.Validate()
}
// Validation for load-balanced mode.
if c.LoadBalanced != nil && *c.LoadBalanced {
if len(c.Hosts) > 1 {
c.err = internal.ErrLoadBalancedWithMultipleHosts
return
}
if c.ReplicaSet != nil {
c.err = internal.ErrLoadBalancedWithReplicaSet
return
}
if c.Direct != nil {
c.err = internal.ErrLoadBalancedWithDirectConnection
return
}
}
// Validation for srvMaxHosts.
if c.SRVMaxHosts != nil && *c.SRVMaxHosts > 0 {
if c.ReplicaSet != nil {
c.err = internal.ErrSRVMaxHostsWithReplicaSet
}
if c.LoadBalanced != nil && *c.LoadBalanced {
c.err = internal.ErrSRVMaxHostsWithLoadBalanced
}
}
}
// GetURI returns the original URI used to configure the ClientOptions instance. If ApplyURI was not called during
// construction, this returns "".
func (c *ClientOptions) GetURI() string {
return c.uri
}
// ApplyURI parses the given URI and sets options accordingly. The URI can contain host names, IPv4/IPv6 literals, or
// an SRV record that will be resolved when the Client is created. When using an SRV record, TLS support is
// implictly enabled. Specify the "tls=false" URI option to override this.
//
// If the connection string contains any options that have previously been set, it will overwrite them. Options that
// correspond to multiple URI parameters, such as WriteConcern, will be completely overwritten if any of the query
// parameters are specified. If an option is set on ClientOptions after this method is called, that option will override
// any option applied via the connection string.
//
// If the URI format is incorrect or there are conflicting options specified in the URI an error will be recorded and
// can be retrieved by calling Validate.
//
// For more information about the URI format, see https://docs.mongodb.com/manual/reference/connection-string/. See
// mongo.Connect documentation for examples of using URIs for different Client configurations.
func (c *ClientOptions) ApplyURI(uri string) *ClientOptions {
if c.err != nil {
return c
}
c.uri = uri
cs, err := connstring.ParseAndValidate(uri)
if err != nil {
c.err = err
return c
}
c.cs = &cs
if cs.AppName != "" {
c.AppName = &cs.AppName
}
// Only create a Credential if there is a request for authentication via non-empty credentials in the URI.
if cs.HasAuthParameters() {
c.Auth = &Credential{
AuthMechanism: cs.AuthMechanism,
AuthMechanismProperties: cs.AuthMechanismProperties,
AuthSource: cs.AuthSource,
Username: cs.Username,
Password: cs.Password,
PasswordSet: cs.PasswordSet,
}
}
if cs.ConnectSet {
direct := cs.Connect == connstring.SingleConnect
c.Direct = &direct
}
if cs.DirectConnectionSet {
c.Direct = &cs.DirectConnection
}
if cs.ConnectTimeoutSet {
c.ConnectTimeout = &cs.ConnectTimeout
}
if len(cs.Compressors) > 0 {
c.Compressors = cs.Compressors
if stringSliceContains(c.Compressors, "zlib") {
defaultLevel := wiremessage.DefaultZlibLevel
c.ZlibLevel = &defaultLevel
}
if stringSliceContains(c.Compressors, "zstd") {
defaultLevel := wiremessage.DefaultZstdLevel
c.ZstdLevel = &defaultLevel
}
}
if cs.HeartbeatIntervalSet {
c.HeartbeatInterval = &cs.HeartbeatInterval
}
c.Hosts = cs.Hosts
if cs.LoadBalancedSet {
c.LoadBalanced = &cs.LoadBalanced
}
if cs.LocalThresholdSet {
c.LocalThreshold = &cs.LocalThreshold
}
if cs.MaxConnIdleTimeSet {
c.MaxConnIdleTime = &cs.MaxConnIdleTime
}
if cs.MaxPoolSizeSet {
c.MaxPoolSize = &cs.MaxPoolSize
}
if cs.MinPoolSizeSet {
c.MinPoolSize = &cs.MinPoolSize
}
if cs.MaxConnectingSet {
c.MaxConnecting = &cs.MaxConnecting
}
if cs.ReadConcernLevel != "" {
c.ReadConcern = readconcern.New(readconcern.Level(cs.ReadConcernLevel))
}
if cs.ReadPreference != "" || len(cs.ReadPreferenceTagSets) > 0 || cs.MaxStalenessSet {
opts := make([]readpref.Option, 0, 1)
tagSets := tag.NewTagSetsFromMaps(cs.ReadPreferenceTagSets)
if len(tagSets) > 0 {
opts = append(opts, readpref.WithTagSets(tagSets...))
}
if cs.MaxStaleness != 0 {
opts = append(opts, readpref.WithMaxStaleness(cs.MaxStaleness))
}
mode, err := readpref.ModeFromString(cs.ReadPreference)
if err != nil {
c.err = err
return c
}
c.ReadPreference, c.err = readpref.New(mode, opts...)
if c.err != nil {
return c
}
}
if cs.RetryWritesSet {
c.RetryWrites = &cs.RetryWrites
}
if cs.RetryReadsSet {
c.RetryReads = &cs.RetryReads
}
if cs.ReplicaSet != "" {
c.ReplicaSet = &cs.ReplicaSet
}
if cs.ServerSelectionTimeoutSet {
c.ServerSelectionTimeout = &cs.ServerSelectionTimeout
}
if cs.SocketTimeoutSet {
c.SocketTimeout = &cs.SocketTimeout
}
if cs.SRVMaxHosts != 0 {
c.SRVMaxHosts = &cs.SRVMaxHosts
}
if cs.SRVServiceName != "" {
c.SRVServiceName = &cs.SRVServiceName
}
if cs.SSL {
tlsConfig := new(tls.Config)
if cs.SSLCaFileSet {
c.err = addCACertFromFile(tlsConfig, cs.SSLCaFile)
if c.err != nil {
return c
}
}
if cs.SSLInsecure {
tlsConfig.InsecureSkipVerify = true
}
var x509Subject string
var keyPasswd string
if cs.SSLClientCertificateKeyPasswordSet && cs.SSLClientCertificateKeyPassword != nil {
keyPasswd = cs.SSLClientCertificateKeyPassword()
}
if cs.SSLClientCertificateKeyFileSet {
x509Subject, err = addClientCertFromConcatenatedFile(tlsConfig, cs.SSLClientCertificateKeyFile, keyPasswd)
} else if cs.SSLCertificateFileSet || cs.SSLPrivateKeyFileSet {
x509Subject, err = addClientCertFromSeparateFiles(tlsConfig, cs.SSLCertificateFile,
cs.SSLPrivateKeyFile, keyPasswd)
}
if err != nil {
c.err = err
return c
}
// If a username wasn't specified fork x509, add one from the certificate.
if c.Auth != nil && strings.ToLower(c.Auth.AuthMechanism) == "mongodb-x509" &&
c.Auth.Username == "" {
// The Go x509 package gives the subject with the pairs in reverse order that we want.
c.Auth.Username = extractX509UsernameFromSubject(x509Subject)
}
c.TLSConfig = tlsConfig
}
if cs.JSet || cs.WString != "" || cs.WNumberSet || cs.WTimeoutSet {
opts := make([]writeconcern.Option, 0, 1)
if len(cs.WString) > 0 {
opts = append(opts, writeconcern.WTagSet(cs.WString))
} else if cs.WNumberSet {
opts = append(opts, writeconcern.W(cs.WNumber))
}
if cs.JSet {
opts = append(opts, writeconcern.J(cs.J))
}
if cs.WTimeoutSet {
opts = append(opts, writeconcern.WTimeout(cs.WTimeout))
}
c.WriteConcern = writeconcern.New(opts...)
}
if cs.ZlibLevelSet {
c.ZlibLevel = &cs.ZlibLevel
}
if cs.ZstdLevelSet {
c.ZstdLevel = &cs.ZstdLevel
}
if cs.SSLDisableOCSPEndpointCheckSet {
c.DisableOCSPEndpointCheck = &cs.SSLDisableOCSPEndpointCheck
}
return c
}
// SetAppName specifies an application name that is sent to the server when creating new connections. It is used by the
// server to log connection and profiling information (e.g. slow query logs). This can also be set through the "appName"
// URI option (e.g "appName=example_application"). The default is empty, meaning no app name will be sent.
func (c *ClientOptions) SetAppName(s string) *ClientOptions {
c.AppName = &s
return c
}
// SetAuth specifies a Credential containing options for configuring authentication. See the options.Credential
// documentation for more information about Credential fields. The default is an empty Credential, meaning no
// authentication will be configured.
func (c *ClientOptions) SetAuth(auth Credential) *ClientOptions {
c.Auth = &auth
return c
}
// SetCompressors sets the compressors that can be used when communicating with a server. Valid values are:
//
// 1. "snappy" - requires server version >= 3.4
//
// 2. "zlib" - requires server version >= 3.6
//
// 3. "zstd" - requires server version >= 4.2, and driver version >= 1.2.0 with cgo support enabled or driver version >= 1.3.0
// without cgo
//
// If this option is specified, the driver will perform a negotiation with the server to determine a common list of of
// compressors and will use the first one in that list when performing operations. See
// https://docs.mongodb.com/manual/reference/program/mongod/#cmdoption-mongod-networkmessagecompressors for more
// information about configuring compression on the server and the server-side defaults.
//
// This can also be set through the "compressors" URI option (e.g. "compressors=zstd,zlib,snappy"). The default is
// an empty slice, meaning no compression will be enabled.
func (c *ClientOptions) SetCompressors(comps []string) *ClientOptions {
c.Compressors = comps
return c
}
// SetConnectTimeout specifies a timeout that is used for creating connections to the server. If a custom Dialer is
// specified through SetDialer, this option must not be used. This can be set through ApplyURI with the
// "connectTimeoutMS" (e.g "connectTimeoutMS=30") option. If set to 0, no timeout will be used. The default is 30
// seconds.
func (c *ClientOptions) SetConnectTimeout(d time.Duration) *ClientOptions {
c.ConnectTimeout = &d
return c
}
// SetDialer specifies a custom ContextDialer to be used to create new connections to the server. The default is a
// net.Dialer with the Timeout field set to ConnectTimeout. See https://golang.org/pkg/net/#Dialer for more information
// about the net.Dialer type.
func (c *ClientOptions) SetDialer(d ContextDialer) *ClientOptions {
c.Dialer = d
return c
}
// SetDirect specifies whether or not a direct connect should be made. If set to true, the driver will only connect to
// the host provided in the URI and will not discover other hosts in the cluster. This can also be set through the
// "directConnection" URI option. This option cannot be set to true if multiple hosts are specified, either through
// ApplyURI or SetHosts, or an SRV URI is used.
//
// As of driver version 1.4, the "connect" URI option has been deprecated and replaced with "directConnection". The
// "connect" URI option has two values:
//
// 1. "connect=direct" for direct connections. This corresponds to "directConnection=true".
//
// 2. "connect=automatic" for automatic discovery. This corresponds to "directConnection=false"
//
// If the "connect" and "directConnection" URI options are both specified in the connection string, their values must
// not conflict. Direct connections are not valid if multiple hosts are specified or an SRV URI is used. The default
// value for this option is false.
func (c *ClientOptions) SetDirect(b bool) *ClientOptions {
c.Direct = &b
return c
}
// SetHeartbeatInterval specifies the amount of time to wait between periodic background server checks. This can also be
// set through the "heartbeatIntervalMS" URI option (e.g. "heartbeatIntervalMS=10000"). The default is 10 seconds.
func (c *ClientOptions) SetHeartbeatInterval(d time.Duration) *ClientOptions {
c.HeartbeatInterval = &d
return c
}
// SetHosts specifies a list of host names or IP addresses for servers in a cluster. Both IPv4 and IPv6 addresses are
// supported. IPv6 literals must be enclosed in '[]' following RFC-2732 syntax.
//
// Hosts can also be specified as a comma-separated list in a URI. For example, to include "localhost:27017" and
// "localhost:27018", a URI could be "mongodb://localhost:27017,localhost:27018". The default is ["localhost:27017"]
func (c *ClientOptions) SetHosts(s []string) *ClientOptions {
c.Hosts = s
return c
}
// SetLoadBalanced specifies whether or not the MongoDB deployment is hosted behind a load balancer. This can also be
// set through the "loadBalanced" URI option. The driver will error during Client configuration if this option is set
// to true and one of the following conditions are met:
//
// 1. Multiple hosts are specified, either via the ApplyURI or SetHosts methods. This includes the case where an SRV
// URI is used and the SRV record resolves to multiple hostnames.
// 2. A replica set name is specified, either via the URI or the SetReplicaSet method.
// 3. The options specify whether or not a direct connection should be made, either via the URI or the SetDirect method.
//
// The default value is false.
func (c *ClientOptions) SetLoadBalanced(lb bool) *ClientOptions {
c.LoadBalanced = &lb
return c
}
// SetLocalThreshold specifies the width of the 'latency window': when choosing between multiple suitable servers for an
// operation, this is the acceptable non-negative delta between shortest and longest average round-trip times. A server
// within the latency window is selected randomly. This can also be set through the "localThresholdMS" URI option (e.g.
// "localThresholdMS=15000"). The default is 15 milliseconds.
func (c *ClientOptions) SetLocalThreshold(d time.Duration) *ClientOptions {
c.LocalThreshold = &d
return c
}
// SetMaxConnIdleTime specifies the maximum amount of time that a connection will remain idle in a connection pool
// before it is removed from the pool and closed. This can also be set through the "maxIdleTimeMS" URI option (e.g.
// "maxIdleTimeMS=10000"). The default is 0, meaning a connection can remain unused indefinitely.
func (c *ClientOptions) SetMaxConnIdleTime(d time.Duration) *ClientOptions {
c.MaxConnIdleTime = &d
return c
}
// SetMaxPoolSize specifies that maximum number of connections allowed in the driver's connection pool to each server.
// Requests to a server will block if this maximum is reached. This can also be set through the "maxPoolSize" URI option
// (e.g. "maxPoolSize=100"). If this is 0, maximum connection pool size is not limited. The default is 100.
func (c *ClientOptions) SetMaxPoolSize(u uint64) *ClientOptions {
c.MaxPoolSize = &u
return c
}
// SetMinPoolSize specifies the minimum number of connections allowed in the driver's connection pool to each server. If
// this is non-zero, each server's pool will be maintained in the background to ensure that the size does not fall below
// the minimum. This can also be set through the "minPoolSize" URI option (e.g. "minPoolSize=100"). The default is 0.
func (c *ClientOptions) SetMinPoolSize(u uint64) *ClientOptions {
c.MinPoolSize = &u
return c
}
// SetMaxConnecting specifies the maximum number of connections a connection pool may establish simultaneously. This can
// also be set through the "maxConnecting" URI option (e.g. "maxConnecting=2"). If this is 0, the default is used. The
// default is 2. Values greater than 100 are not recommended.
func (c *ClientOptions) SetMaxConnecting(u uint64) *ClientOptions {
c.MaxConnecting = &u
return c
}
// SetPoolMonitor specifies a PoolMonitor to receive connection pool events. See the event.PoolMonitor documentation
// for more information about the structure of the monitor and events that can be received.
func (c *ClientOptions) SetPoolMonitor(m *event.PoolMonitor) *ClientOptions {
c.PoolMonitor = m
return c
}
// SetMonitor specifies a CommandMonitor to receive command events. See the event.CommandMonitor documentation for more
// information about the structure of the monitor and events that can be received.
func (c *ClientOptions) SetMonitor(m *event.CommandMonitor) *ClientOptions {
c.Monitor = m
return c
}
// SetServerMonitor specifies an SDAM monitor used to monitor SDAM events.
func (c *ClientOptions) SetServerMonitor(m *event.ServerMonitor) *ClientOptions {
c.ServerMonitor = m
return c
}
// SetReadConcern specifies the read concern to use for read operations. A read concern level can also be set through
// the "readConcernLevel" URI option (e.g. "readConcernLevel=majority"). The default is nil, meaning the server will use
// its configured default.
func (c *ClientOptions) SetReadConcern(rc *readconcern.ReadConcern) *ClientOptions {
c.ReadConcern = rc
return c
}
// SetReadPreference specifies the read preference to use for read operations. This can also be set through the
// following URI options:
//
// 1. "readPreference" - Specify the read preference mode (e.g. "readPreference=primary").
//
// 2. "readPreferenceTags": Specify one or more read preference tags
// (e.g. "readPreferenceTags=region:south,datacenter:A").
//
// 3. "maxStalenessSeconds" (or "maxStaleness"): Specify a maximum replication lag for reads from secondaries in a
// replica set (e.g. "maxStalenessSeconds=10").
//
// The default is readpref.Primary(). See https://docs.mongodb.com/manual/core/read-preference/#read-preference for
// more information about read preferences.
func (c *ClientOptions) SetReadPreference(rp *readpref.ReadPref) *ClientOptions {
c.ReadPreference = rp
return c
}
// SetRegistry specifies the BSON registry to use for BSON marshalling/unmarshalling operations. The default is
// bson.DefaultRegistry.
func (c *ClientOptions) SetRegistry(registry *bsoncodec.Registry) *ClientOptions {
c.Registry = registry
return c
}
// SetReplicaSet specifies the replica set name for the cluster. If specified, the cluster will be treated as a replica
// set and the driver will automatically discover all servers in the set, starting with the nodes specified through
// ApplyURI or SetHosts. All nodes in the replica set must have the same replica set name, or they will not be
// considered as part of the set by the Client. This can also be set through the "replicaSet" URI option (e.g.
// "replicaSet=replset"). The default is empty.
func (c *ClientOptions) SetReplicaSet(s string) *ClientOptions {
c.ReplicaSet = &s
return c
}
// SetRetryWrites specifies whether supported write operations should be retried once on certain errors, such as network
// errors.
//
// Supported operations are InsertOne, UpdateOne, ReplaceOne, DeleteOne, FindOneAndDelete, FindOneAndReplace,
// FindOneAndDelete, InsertMany, and BulkWrite. Note that BulkWrite requests must not include UpdateManyModel or
// DeleteManyModel instances to be considered retryable. Unacknowledged writes will not be retried, even if this option
// is set to true.
//
// This option requires server version >= 3.6 and a replica set or sharded cluster and will be ignored for any other
// cluster type. This can also be set through the "retryWrites" URI option (e.g. "retryWrites=true"). The default is
// true.
func (c *ClientOptions) SetRetryWrites(b bool) *ClientOptions {
c.RetryWrites = &b
return c
}
// SetRetryReads specifies whether supported read operations should be retried once on certain errors, such as network
// errors.
//
// Supported operations are Find, FindOne, Aggregate without a $out stage, Distinct, CountDocuments,
// EstimatedDocumentCount, Watch (for Client, Database, and Collection), ListCollections, and ListDatabases. Note that
// operations run through RunCommand are not retried.
//
// This option requires server version >= 3.6 and driver version >= 1.1.0. The default is true.
func (c *ClientOptions) SetRetryReads(b bool) *ClientOptions {
c.RetryReads = &b
return c
}
// SetServerSelectionTimeout specifies how long the driver will wait to find an available, suitable server to execute an
// operation. This can also be set through the "serverSelectionTimeoutMS" URI option (e.g.
// "serverSelectionTimeoutMS=30000"). The default value is 30 seconds.
func (c *ClientOptions) SetServerSelectionTimeout(d time.Duration) *ClientOptions {
c.ServerSelectionTimeout = &d
return c
}
// SetSocketTimeout specifies how long the driver will wait for a socket read or write to return before returning a
// network error. This can also be set through the "socketTimeoutMS" URI option (e.g. "socketTimeoutMS=1000"). The
// default value is 0, meaning no timeout is used and socket operations can block indefinitely.
func (c *ClientOptions) SetSocketTimeout(d time.Duration) *ClientOptions {
c.SocketTimeout = &d
return c
}
// SetTLSConfig specifies a tls.Config instance to use use to configure TLS on all connections created to the cluster.
// This can also be set through the following URI options:
//
// 1. "tls" (or "ssl"): Specify if TLS should be used (e.g. "tls=true").
//
// 2. Either "tlsCertificateKeyFile" (or "sslClientCertificateKeyFile") or a combination of "tlsCertificateFile" and
// "tlsPrivateKeyFile". The "tlsCertificateKeyFile" option specifies a path to the client certificate and private key,
// which must be concatenated into one file. The "tlsCertificateFile" and "tlsPrivateKey" combination specifies separate
// paths to the client certificate and private key, respectively. Note that if "tlsCertificateKeyFile" is used, the
// other two options must not be specified.
//
// 3. "tlsCertificateKeyFilePassword" (or "sslClientCertificateKeyPassword"): Specify the password to decrypt the client
// private key file (e.g. "tlsCertificateKeyFilePassword=password").
//
// 4. "tlsCaFile" (or "sslCertificateAuthorityFile"): Specify the path to a single or bundle of certificate authorities
// to be considered trusted when making a TLS connection (e.g. "tlsCaFile=/path/to/caFile").
//
// 5. "tlsInsecure" (or "sslInsecure"): Specifies whether or not certificates and hostnames received from the server
// should be validated. If true (e.g. "tlsInsecure=true"), the TLS library will accept any certificate presented by the
// server and any host name in that certificate. Note that setting this to true makes TLS susceptible to
// man-in-the-middle attacks and should only be done for testing.
//
// The default is nil, meaning no TLS will be enabled.
func (c *ClientOptions) SetTLSConfig(cfg *tls.Config) *ClientOptions {
c.TLSConfig = cfg
return c
}
// SetWriteConcern specifies the write concern to use to for write operations. This can also be set through the following
// URI options:
//
// 1. "w": Specify the number of nodes in the cluster that must acknowledge write operations before the operation
// returns or "majority" to specify that a majority of the nodes must acknowledge writes. This can either be an integer
// (e.g. "w=10") or the string "majority" (e.g. "w=majority").
//
// 2. "wTimeoutMS": Specify how long write operations should wait for the correct number of nodes to acknowledge the
// operation (e.g. "wTimeoutMS=1000").
//
// 3. "journal": Specifies whether or not write operations should be written to an on-disk journal on the server before
// returning (e.g. "journal=true").
//
// The default is nil, meaning the server will use its configured default.
func (c *ClientOptions) SetWriteConcern(wc *writeconcern.WriteConcern) *ClientOptions {
c.WriteConcern = wc
return c
}
// SetZlibLevel specifies the level for the zlib compressor. This option is ignored if zlib is not specified as a
// compressor through ApplyURI or SetCompressors. Supported values are -1 through 9, inclusive. -1 tells the zlib
// library to use its default, 0 means no compression, 1 means best speed, and 9 means best compression.
// This can also be set through the "zlibCompressionLevel" URI option (e.g. "zlibCompressionLevel=-1"). Defaults to -1.
func (c *ClientOptions) SetZlibLevel(level int) *ClientOptions {
c.ZlibLevel = &level
return c
}
// SetZstdLevel sets the level for the zstd compressor. This option is ignored if zstd is not specified as a compressor
// through ApplyURI or SetCompressors. Supported values are 1 through 20, inclusive. 1 means best speed and 20 means
// best compression. This can also be set through the "zstdCompressionLevel" URI option. Defaults to 6.
func (c *ClientOptions) SetZstdLevel(level int) *ClientOptions {
c.ZstdLevel = &level
return c
}
// SetAutoEncryptionOptions specifies an AutoEncryptionOptions instance to automatically encrypt and decrypt commands
// and their results. See the options.AutoEncryptionOptions documentation for more information about the supported
// options.
func (c *ClientOptions) SetAutoEncryptionOptions(opts *AutoEncryptionOptions) *ClientOptions {
c.AutoEncryptionOptions = opts
return c
}
// SetDisableOCSPEndpointCheck specifies whether or not the driver should reach out to OCSP responders to verify the
// certificate status for certificates presented by the server that contain a list of OCSP responders.
//
// If set to true, the driver will verify the status of the certificate using a response stapled by the server, if there
// is one, but will not send an HTTP request to any responders if there is no staple. In this case, the driver will
// continue the connection even though the certificate status is not known.
//
// This can also be set through the tlsDisableOCSPEndpointCheck URI option. Both this URI option and tlsInsecure must
// not be set at the same time and will error if they are. The default value is false.
func (c *ClientOptions) SetDisableOCSPEndpointCheck(disableCheck bool) *ClientOptions {
c.DisableOCSPEndpointCheck = &disableCheck
return c
}
// SetServerAPIOptions specifies a ServerAPIOptions instance used to configure the API version sent to the server
// when running commands. See the options.ServerAPIOptions documentation for more information about the supported
// options.
func (c *ClientOptions) SetServerAPIOptions(opts *ServerAPIOptions) *ClientOptions {
c.ServerAPIOptions = opts
return c
}
// SetSRVMaxHosts specifies the maximum number of SRV results to randomly select during polling. To limit the number
// of hosts selected in SRV discovery, this function must be called before ApplyURI. This can also be set through
// the "srvMaxHosts" URI option.
func (c *ClientOptions) SetSRVMaxHosts(srvMaxHosts int) *ClientOptions {
c.SRVMaxHosts = &srvMaxHosts
return c
}
// SetSRVServiceName specifies a custom SRV service name to use in SRV polling. To use a custom SRV service name
// in SRV discovery, this function must be called before ApplyURI. This can also be set through the "srvServiceName"
// URI option.
func (c *ClientOptions) SetSRVServiceName(srvName string) *ClientOptions {
c.SRVServiceName = &srvName
return c
}
// MergeClientOptions combines the given *ClientOptions into a single *ClientOptions in a last one wins fashion.
// The specified options are merged with the existing options on the client, with the specified options taking
// precedence.
func MergeClientOptions(opts ...*ClientOptions) *ClientOptions {
c := Client()
for _, opt := range opts {
if opt == nil {
continue
}
if opt.Dialer != nil {
c.Dialer = opt.Dialer
}
if opt.AppName != nil {
c.AppName = opt.AppName
}
if opt.Auth != nil {
c.Auth = opt.Auth
}
if opt.AuthenticateToAnything != nil {
c.AuthenticateToAnything = opt.AuthenticateToAnything
}
if opt.Compressors != nil {
c.Compressors = opt.Compressors
}
if opt.ConnectTimeout != nil {
c.ConnectTimeout = opt.ConnectTimeout
}
if opt.Crypt != nil {
c.Crypt = opt.Crypt
}
if opt.HeartbeatInterval != nil {
c.HeartbeatInterval = opt.HeartbeatInterval
}
if len(opt.Hosts) > 0 {
c.Hosts = opt.Hosts
}
if opt.LoadBalanced != nil {
c.LoadBalanced = opt.LoadBalanced
}
if opt.LocalThreshold != nil {
c.LocalThreshold = opt.LocalThreshold
}
if opt.MaxConnIdleTime != nil {
c.MaxConnIdleTime = opt.MaxConnIdleTime
}
if opt.MaxPoolSize != nil {
c.MaxPoolSize = opt.MaxPoolSize
}
if opt.MinPoolSize != nil {
c.MinPoolSize = opt.MinPoolSize
}
if opt.MaxConnecting != nil {
c.MaxConnecting = opt.MaxConnecting
}
if opt.PoolMonitor != nil {
c.PoolMonitor = opt.PoolMonitor
}
if opt.Monitor != nil {
c.Monitor = opt.Monitor
}
if opt.ServerAPIOptions != nil {
c.ServerAPIOptions = opt.ServerAPIOptions
}
if opt.ServerMonitor != nil {
c.ServerMonitor = opt.ServerMonitor
}
if opt.ReadConcern != nil {
c.ReadConcern = opt.ReadConcern
}
if opt.ReadPreference != nil {
c.ReadPreference = opt.ReadPreference
}
if opt.Registry != nil {
c.Registry = opt.Registry
}
if opt.ReplicaSet != nil {
c.ReplicaSet = opt.ReplicaSet
}
if opt.RetryWrites != nil {
c.RetryWrites = opt.RetryWrites
}
if opt.RetryReads != nil {
c.RetryReads = opt.RetryReads
}
if opt.ServerSelectionTimeout != nil {
c.ServerSelectionTimeout = opt.ServerSelectionTimeout
}
if opt.Direct != nil {
c.Direct = opt.Direct
}
if opt.SocketTimeout != nil {
c.SocketTimeout = opt.SocketTimeout
}
if opt.SRVMaxHosts != nil {
c.SRVMaxHosts = opt.SRVMaxHosts
}
if opt.SRVServiceName != nil {
c.SRVServiceName = opt.SRVServiceName
}
if opt.TLSConfig != nil {
c.TLSConfig = opt.TLSConfig
}
if opt.WriteConcern != nil {
c.WriteConcern = opt.WriteConcern
}
if opt.ZlibLevel != nil {
c.ZlibLevel = opt.ZlibLevel
}
if opt.ZstdLevel != nil {
c.ZstdLevel = opt.ZstdLevel
}
if opt.AutoEncryptionOptions != nil {
c.AutoEncryptionOptions = opt.AutoEncryptionOptions
}
if opt.Deployment != nil {
c.Deployment = opt.Deployment
}
if opt.DisableOCSPEndpointCheck != nil {
c.DisableOCSPEndpointCheck = opt.DisableOCSPEndpointCheck
}
if opt.err != nil {
c.err = opt.err
}
if opt.uri != "" {
c.uri = opt.uri
}
if opt.cs != nil {
c.cs = opt.cs
}
}
return c
}
// addCACertFromFile adds a root CA certificate to the configuration given a path
// to the containing file.
func addCACertFromFile(cfg *tls.Config, file string) error {
data, err := ioutil.ReadFile(file)
if err != nil {
return err
}
if cfg.RootCAs == nil {
cfg.RootCAs = x509.NewCertPool()
}
if !cfg.RootCAs.AppendCertsFromPEM(data) {
return errors.New("the specified CA file does not contain any valid certificates")
}
return nil
}
func addClientCertFromSeparateFiles(cfg *tls.Config, keyFile, certFile, keyPassword string) (string, error) {
keyData, err := ioutil.ReadFile(keyFile)
if err != nil {
return "", err
}
certData, err := ioutil.ReadFile(certFile)
if err != nil {
return "", err
}
data := append(keyData, '\n')
data = append(data, certData...)
return addClientCertFromBytes(cfg, data, keyPassword)
}
func addClientCertFromConcatenatedFile(cfg *tls.Config, certKeyFile, keyPassword string) (string, error) {
data, err := ioutil.ReadFile(certKeyFile)
if err != nil {
return "", err
}
return addClientCertFromBytes(cfg, data, keyPassword)
}
// addClientCertFromBytes adds a client certificate to the configuration given a path to the
// containing file and returns the certificate's subject name.
func addClientCertFromBytes(cfg *tls.Config, data []byte, keyPasswd string) (string, error) {
var currentBlock *pem.Block
var certDecodedBlock []byte
var certBlocks, keyBlocks [][]byte
remaining := data
start := 0
for {
currentBlock, remaining = pem.Decode(remaining)
if currentBlock == nil {
break
}
if currentBlock.Type == "CERTIFICATE" {
certBlock := data[start : len(data)-len(remaining)]
certBlocks = append(certBlocks, certBlock)
certDecodedBlock = currentBlock.Bytes
start += len(certBlock)
} else if strings.HasSuffix(currentBlock.Type, "PRIVATE KEY") {
isEncrypted := x509.IsEncryptedPEMBlock(currentBlock) || strings.Contains(currentBlock.Type, "ENCRYPTED PRIVATE KEY")
if isEncrypted {
if keyPasswd == "" {
return "", fmt.Errorf("no password provided to decrypt private key")
}
var keyBytes []byte
var err error
// Process the X.509-encrypted or PKCS-encrypted PEM block.
if x509.IsEncryptedPEMBlock(currentBlock) {
// Only covers encrypted PEM data with a DEK-Info header.
keyBytes, err = x509.DecryptPEMBlock(currentBlock, []byte(keyPasswd))
if err != nil {
return "", err
}
} else if strings.Contains(currentBlock.Type, "ENCRYPTED") {
// The pkcs8 package only handles the PKCS #5 v2.0 scheme.
decrypted, err := pkcs8.ParsePKCS8PrivateKey(currentBlock.Bytes, []byte(keyPasswd))
if err != nil {
return "", err
}
keyBytes, err = x509.MarshalPKCS8PrivateKey(decrypted)
if err != nil {
return "", err
}
}
var encoded bytes.Buffer
pem.Encode(&encoded, &pem.Block{Type: currentBlock.Type, Bytes: keyBytes})
keyBlock := encoded.Bytes()
keyBlocks = append(keyBlocks, keyBlock)
start = len(data) - len(remaining)
} else {
keyBlock := data[start : len(data)-len(remaining)]
keyBlocks = append(keyBlocks, keyBlock)
start += len(keyBlock)
}
}
}
if len(certBlocks) == 0 {
return "", fmt.Errorf("failed to find CERTIFICATE")
}
if len(keyBlocks) == 0 {
return "", fmt.Errorf("failed to find PRIVATE KEY")
}
cert, err := tls.X509KeyPair(bytes.Join(certBlocks, []byte("\n")), bytes.Join(keyBlocks, []byte("\n")))
if err != nil {
return "", err
}
cfg.Certificates = append(cfg.Certificates, cert)
// The documentation for the tls.X509KeyPair indicates that the Leaf certificate is not
// retained.
crt, err := x509.ParseCertificate(certDecodedBlock)
if err != nil {
return "", err
}
return crt.Subject.String(), nil
}
func stringSliceContains(source []string, target string) bool {
for _, str := range source {
if str == target {
return true
}
}
return false
}
// create a username for x509 authentication from an x509 certificate subject.
func extractX509UsernameFromSubject(subject string) string {
// the Go x509 package gives the subject with the pairs in the reverse order from what we want.
pairs := strings.Split(subject, ",")
for left, right := 0, len(pairs)-1; left < right; left, right = left+1, right-1 {
pairs[left], pairs[right] = pairs[right], pairs[left]
}
return strings.Join(pairs, ",")
}