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Contributing guide

Local development

Environment

There are several requirements to start developing Swoole Bundle:

* - Docker and docker-compose are not critical requirements but highly recommended. For more informations read this section.

PHP

Make sure you have installed the latest version of PHP:

php -v

# PHP 7.4.13 (cli) (built: Nov 24 2020 16:22:20) ( NTS )
# Copyright (c) The PHP Group
# Zend Engine v3.4.0, Copyright (c) Zend Technologies

Currently, the minimum supported version is 7.4.x but it is highly recommended to develop using the latest PHP version.

Docker

Docker is a relatively new solution, therefore vulnerable to security issues, you should always keep it up-to-date.

docker --version

# Docker version 20.10.1, build 831ebeae96

Minimum supported version of Docker due to used docker-compose's format version version 3.8 is 19.03.0+.

docker-compose

docker-compose --version

# docker-compose version 1.27.4, build unknown

docker-compose version is not that important, the only requirement it supports format version 3.8, which should be supported by versions 1.25.5 and above.

Testing

Composer

Code style quick fix command

Command composer fix can be used to automatically format code according to the project's code style. It should be run always before git commit command.

All-in-one command

Command composer test is really helpful to run periodically during development. It consists of basic checks like code style (php-cs-fixer), unit tests (phpunit) and static analysis (phpstan).

Please note that this command does not run feature/functional tests, which are required to pass while adding a new feature or fixing a bug.

Unit tests

Mostly you'll use command composer test which already runs unit tests, but there is also dedicated command composer unit-tests

Feature tests

Command composer feature-tests runs real commands and/or server in subprocesses making it a little bit unstable, upon failure it may leave running server process in the background. It is recommended to run this command using Docker.

To check whether it left server process running in background use command:

lsof -i :9999 | grep php

To kill these processes use command:

kill -9 $(lsof -t -i :9999)

Docker

Building images

Before running any docker command it is required to rebuild container images.

To build all images use the command:

docker-compose build --pull

Or to build specific services use

docker-compose build --pull composer

Info: When your docker installation support BuildKit (docker v18.09+) you can export bellow environment variables to archive faster builds

export COMPOSE_DOCKER_CLI_BUILD="1"
export DOCKER_BUILDKIT="1"

Running composer commands in docker

You can run any composer command directly in docker container using bellow snippets:

docker-compose run --rm composer test
# or
docker-compose run --rm composer feature-tests
# or
docker-compose run --rm composer unit-tests

After you run any docker containers, it's easy to clean up, just run:

docker-compose down

Generating code coverage

To gather code coverage, a PHP extension xdebug or pcov is required. Swoole is currently officially incompatible with any debugging extension, so it is unstable and requires some hacks to reliably gather code coverage, especially for feature tests.

Therefore the full flow of gathering code coverage can be done securely only in docker containers.

Attention: Bellow commands creates locally clover.xml file with merged code coverage in the clover format.

docker-compose build --pull coverage-pcov coverage-xdebug-feature-with-retry merge-code-coverage

docker-compose up -d coverage-volume-helper
docker-compose exec coverage-volume-helper chown 1000:1000 cov
docker-compose run --rm coverage-pcov
docker-compose run --rm coverage-xdebug-feature-with-retry
docker-compose run --rm coverage-pcov feature-code-coverage
docker-compose run --rm merge-code-coverage
docker cp $(docker-compose ps -q coverage-volume-helper):/usr/src/app/cov/clover.xml clover.xml
docker-compose down -v

cat clover.xml

Creating a Pull Request

  1. Fork this repository to your local account
  2. Create a feature/bugfix/any branch from develop branch of this repository
  3. Make your changes (don't forget to write unit/feature tests)
  4. Create a commit with a message following conventional-changelog/angular convetion or use commitizen, otherwise, your commit message must be edited by a maintainer and therefore PR will be a little bit longer in Code Review.
  5. Make sure new and old tests are passing locally (see testing section)
  6. Use composer fix command locally to ensure code is formatted properly
  7. Push your branch to your forked repository
  8. Submit a pull request
  9. If Continous Integration checks fail, try to fix issues and submit changes by either git commit --amend && git push --force your commit(s) or providing a new commit with fixed changes
  10. That's all!

Why docker

Testing Swoole components like Server and Coroutines are currently hard due to a lack of compatible debugging tools (for example to generate code coverage). There are used several hacks to provide a reliable test suite. This requires a stable testing environment due to running fragile tests. Docker ensures every test is running inside the same or very similar environment. Containers also provide nice isolation between test runs, so we won't have to worry about things like cache / temporary files / changes in test files.

Those were the main reasons but there are, of course, some other benefits of using docker like:

  • The easily configurable testing matrix
  • Ability to run the whole test suite locally (and debug its results!)
  • Developers do not have to know for example how to compile PHP extensions (because it's already done in Dockerfile)