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README.md

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).

Release process

For each release candidate and final release, perform the following steps:

Review the CHANGELOG

Update bundle to latest librdkafka

See instructions in kafka/librdkafka/README.md.

Update librdkafka version requirement

Update the minimum required librdkafka version in kafka/00version.go and README.md and the version in examples/go.mod and mk/doc-gen.py.

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

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

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.

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

Update version in Confluent docs

Put the new version in settings.sh of these two repos

https://github.com/confluentinc/docs

https://github.com/confluentinc/docs-platform