Contributing to Google Cloud Pub/Sub

Thank you for your interest in making a contribution to google-cloud-ruby. Community contributions are an essential part of open source, and we want to make contributing easy for you. If you have any suggestions for how to improve this guide, please open an issue and let us know!

Code of Conduct

Please note that this project is covered by a Contributor Code of Conduct. By participating in this project you agree to abide by its terms. See Code of Conduct for more information.

Open an issue

Pull requests should generally be directed by an existing issue, otherwise you risk working on something that the maintainers might not be able to accept into the project. Please take a look through the repository issues, and if you do not see an existing issue for your problem or feature, please open one using one of the provided templates.

Sign Contributor License Agreement

Before we can accept your pull requests you'll need to sign a Contributor License Agreement (CLA):

If you are an individual writing original source code and you own the intellectual property, then you'll need to sign an individual CLA.
If you work for a company that wants to allow you to contribute your work, then you'll need to sign a corporate CLA.

You can sign these electronically. After that, we'll be able to accept your pull requests.

Set up environment

Before you start on a pull request, you should prepare your work environment for development, acceptance testing and the interactive console (optional).

Local development setup

To set up your local development environment:

Install a supported version (or versions) of Ruby. (You may choose to manage your Ruby and gem installations with RVM, rbenv, chruby or a similar tool.)
Install Bundler.

   $ gem install bundler

Fork the google-cloud-ruby repo, clone your fork, and configure the upstream remote:

   git clone https://github.com/<your-username>/google-cloud-ruby.git
   cd google-cloud-ruby
   git remote add upstream git@github.com:googleapis/google-cloud-ruby.git

If your fork and clone are not brand new, get the latest changes from upstream:

   git checkout main
   git pull upstream main

Change to the library's sub-directory in the repo:

   $ cd google-cloud-pubsub

Install (or update) the library dependencies:

   $ bundle update

Create a new topic branch off of the main branch:

   git checkout -b <topic-branch>

Acceptance tests setup

To set up your acceptance test credentials:

If needed, create a Google Cloud project. In the Google Cloud Console, on the project selector page, select or create a project.
Ensure that billing is enabled for your project.
Ensure that the Cloud Pub/Sub API is enabled for your project.
Follow the instructions for Creating a Service Account in AUTHENTICATION.md, including downloading and securely storing a JSON key file.
Set the GCLOUD_TEST_KEYFILE environment variable to the path of the JSON key file that you downloaded in the previous step:

   $ export GCLOUD_TEST_KEYFILE=/path/to/keyfile.json

If you are already using the GCLOUD_TEST_KEYFILE environment variable, and wish to test this library with a different key file, you may set the PUBSUB_TEST_KEYFILE environment variable instead:

   $ export PUBSUB_TEST_KEYFILE=/path/to/keyfile.json

Set the GCLOUD_TEST_PROJECT environment variable to your Google Cloud project ID:

   $ export GCLOUD_TEST_PROJECT=my-project-id

If you are already using the GCLOUD_TEST_PROJECT environment variable, and wish to test this library with a different project, you may set the PUBSUB_TEST_PROJECT environment variable instead:

   $ export PUBSUB_TEST_PROJECT=my-project-id

Interactive console setup (optional)

To set up your interactive console credentials:

Set the GOOGLE_APPLICATION_CREDENTIALS environment variable to the path of your service account JSON key file (see above):

   $ export GOOGLE_APPLICATION_CREDENTIALS=/path/to/keyfile.json

If you are already using the GOOGLE_APPLICATION_CREDENTIALS environment variable, and wish to test this library with a different key file, you may set the PUBSUB_CREDENTIALS environment variable instead:

   $ export PUBSUB_CREDENTIALS=/path/to/keyfile.json

Set the GOOGLE_CLOUD_PROJECT environment variable to your Google Cloud project ID:

   $ export GOOGLE_CLOUD_PROJECT=my-project-id

If you are already using the GOOGLE_CLOUD_PROJECT environment variable, and wish to test this library with a different project, you may set the PUBSUB_PROJECT environment variable instead:

   $ export PUBSUB_PROJECT=my-project-id

Run CI

You are now ready to run local CI checks for the library, which you should do before you make any changes. Doing so ensures that everything is OK with your local environment and the latest dependency versions. You don't want any surprises later.

If you haven't already done so, change to the library's sub-directory in the repo:

$ cd google-cloud-pubsub

To run the code style checks, documentation tests, and unit tests together, use the ci task:

$ bundle exec rake ci

To run the command above, plus all acceptance tests, use rake ci:acceptance or its handy alias, rake ci:a. Keep in mind that the acceptance tests typically take longer than the other CI checks and require authentication credentials. See the Acceptance tests section below for more information.

The Rake tasks aggregated in the commands above can be run individually to streamline your workflow when developing or debugging.

CI check	Command
Static code analysis	`rake rubocop`
Documentation tests	`rake doctest`
Unit tests	`rake test`
Acceptance tests	`rake acceptance`

The subsections below describe the individual CI checks.

Static code analysis

The project uses Rubocop configured with the shared googleapis/ruby-style rules to ensure that your code adheres to Google's Ruby style. The style is largely based on The Ruby Style Guide with a few exceptions:

Avoid parentheses when possible, including in method definitions.
Use double-quoted strings.

You can check your code against these rules by running the Rubocop Rake task:

$ bundle exec rake rubocop

In the rare case that you need to override the existing Rubocop configuration for this library in order to accommodate your changes, you can do so by updating .rubocop.yml.

Documentation tests

When adding a new feature, you should almost always add one or more in-line documentation code examples demonstrating the use of the feature, using YARD's @example tag. Be sure to write a complete, executable example that includes the library require statement and client initialization.

The project uses yard-doctest to execute each sample as a unit test:

$ bundle exec rake doctest

If you add, remove or modify documentation examples, you may need to update the setup for the tests. The fixtures, stubs and mocks required to run the tests are located in support/doctest_helper.rb. Please note that much of the setup is matched to its corresponding example by the title of the @example tag. If you alter an example's title, you may encounter broken tests.

There are generally no assertions or mock verifications in these tests. They simply check that the examples are syntactically correct and execute against the library source code without error.

Unit tests

The project uses the minitest library, including specs, mocks, minitest-autotest, and minitest-focus.

To run the unit tests:

$ bundle exec rake test

Although the unit tests are intended to run quickly, during development or debugging you may want to isolate one or more of the tests by placing the focus keyword just above the test declaration. (See minitest-focus for details.)

Acceptance Tests

The acceptance tests (a.k.a. integration tests) ensure that the library works correctly against the live service API. To configure your Google Cloud project, see Acceptance tests setup above.

Warning: You may incur charges while running the acceptance tests against your Google Cloud project.

Like the unit tests, the acceptance tests are based on the minitest library, including specs and minitest-focus. Mocks are not generally used in acceptance tests.

Because the acceptance test suite is often time-consuming to run in its entirety, during development or debugging you may want to isolate one or more of the tests by placing the focus keyword just above the test declaration. (See minitest-focus for details.)

To run the acceptance tests:

$ bundle exec rake acceptance

Some acceptance tests may depend on API features that are not yet generally available, and will fail unless your project is added to an internal allowlist. There may also be tests that usually pass but fail occasionally due to issues like eventual consistency. However, please ensure that you do successfully run acceptance tests for any code areas covered by your pull request.

Make changes

All contributions should include new or updated tests to ensure that the contributed code behaves as expected.

When starting work on a new feature, it often makes sense to begin with a basic acceptance test to ensure that the new feature is present in the live service API and is available to your project. To run your new test exclusively, temporarily add the focus keyword just above the test declaration. (See minitest-focus for details.) Also, the acceptance tests have a retry mechanism that can sometimes make it hard to see the correct error when things go wrong. To disable retries while debugging errors, temporarily comment out or remove the run_one_method method definition in acceptance/pubsub_helper.rb.

When you are done developing, be sure to remove any usages of the focus keyword from your tests and restore the run_one_method method definition if you removed it.

Console

The project includes a Rake task that automatically loads google-cloud-pubsub and its dependencies in IRB. To configure your Google Cloud project for IRB, see Interactive console setup above.

Warning: You may incur charges while using the library with your Google Cloud project.

If you haven't already done so, change to the library's sub-directory in the repo:

$ cd google-cloud-pubsub

The preloaded IRB console can be used as follows:

$ bundle exec rake console
irb(main):001:0> require "google/cloud/pubsub"
=> true
irb(main):002:0> pubsub = Google::Cloud::PubSub.new

Using the console provides an interactive alternative to acceptance testing that may make it easier to explore usage and debug problems.

Commit changes

Commit your changes using conventional commits, making sure to include the associated GitHub issue number. Below is an example of a feat type commit that will result in a semver minor release. Notice how it is scoped to the short name of the library, contains a bulleted list of public API changes, and ends with the closes GitHub keyword. If this is the only new commit in your branch when you open your pull request, the commit body including the closes phrase will be copied to your PR description. If you have multiple commits, you should copy the body of this anchor commit manually to the PR description, so that GitHub will automatically close the related issue.

git commit -am "feat(pubsub): Add my new feature

* Add MyClass#my_method

closes: #123"

The messages for any subsequent commits you may add do not necessarily need to follow the conventional commits format, as these messages will be manually dropped or added as bullet points to the original message when the PR is squashed and merged.

Run CI again

If you haven't already done so, change to the library's sub-directory in the repo:

   $ cd google-cloud-pubsub

Rebase your topic branch on the upstream main branch:

   git pull --rebase upstream main

Run the ci task:

   $ bundle exec rake ci

Run the acceptance task:

   $ bundle exec rake acceptance

Ensure that everything is passing in rake ci and rake acceptance, or at least that rake ci is green and you haven't broken anything new in rake acceptance, before you open your pull request.

Submit your pull request

Rebase your topic branch on the upstream main branch:

   git pull --rebase upstream main

Push your topic branch to your fork:

   git push origin -u

Open a pull request using the first line of your conventional commit as the title, and with the associated GitHub issue in the description. By convention in this project, the assignee of the pull request will be the maintainer who will merge it once it is approved. If you are a maintainer of the project, typically you should assign the pull request to yourself.
Ensure that all of the GitHub checks are passing.