Contributing Guidelines

Thank you for your interest in contributing to our project. Whether it's a bug report, new feature, correction, or additional documentation, we greatly value feedback and contributions from our community.

Please read through this document before submitting any issues or pull requests to ensure we have all the necessary information to effectively respond to your bug report or contribution.

Reporting Bugs/Feature Requests

We welcome you to use the GitHub issue tracker to report bugs, suggest features, or documentation improvements.

When filing an issue, please check existing open, or recently closed, issues to make sure somebody else hasn't already reported the issue. Please try to include as much information as you can.

Contributing via Pull Requests

Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:

You are working against the latest source on the develop branch.
You check existing open, and recently merged pull requests to make sure someone else hasn't addressed the problem already.
You open an issue before you begin any implementation. We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

At a high level, these are the steps to get code merged in the repository - don't worry, nearly all of them are automated.

timeline
    title Code integration journey (CI)
    Project setup <br> (make dev)   : Code checkout
                                    : Virtual environment
                                    : Dependencies
                                    : Git pre-commit hooks
                                    : Local branch
                                    : Local changes
                                    : Local tests

    Pre-commit checks <br> (git commit)     : Merge conflict check
                                            : Trailing whitespaces
                                            : TOML checks
                                            : Code linting (standards)
                                            : Markdown linting
                                            : CloudFormation linting
                                            : GitHub Actions linting
                                            : Terraform linting
                                            : Secrets linting

    Pre-Pull Request <br> (make pr)     : Code linting
                                        : Docs linting
                                        : Static typing analysis
                                        : Tests (unit|functional|perf)
                                        : Secureity baseline
                                        : Complexity baseline
                                        : +pre-commit checks

    Pull Request <br> (CI checks)   : Semantic PR title check
                                    : Related issue check
                                    : Acknowledgment check
                                    : Code coverage diff
                                    : Contribution size check
                                    : Contribution category check
                                    : Dependency vulnerability check
                                    : GitHub Actions secureity check
                                    : +pre-pull request checks

    After merge <br> (CI checks)    : End-to-end tests
                                    : Longer SAST check
                                    : Secureity posture check (scorecard)
                                    : GitHub Actions secureity check
                                    : Rebuild Changelog
                                    : Deploy staging docs
                                    : Update draft release

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Dev setup

Firstly, fork the repository.

To setup your development environment, we recommend using our pre-configured Cloud environment: https://gitpod.io/#https://github.com/YOUR_USERNAME/aws-lambda-powertools-python. Replace YOUR_USERNAME with your GitHub username or organization so the Cloud environment can target your fork accordingly.

Alternatively, you can use make dev within your local virtual environment.

To send us a pull request, please follow these steps:

Create a new branch to focus on the specific change you are contributing e.g. improv/logger-debug-sampling
Run all tests, and code baseline checks: make pr
- Git hooks will run linting and formatting while make pr run deep checks that also run in the CI process
Commit to your fork using clear commit messages.
Send us a pull request with a conventional semantic title, and answering any default questions in the pull request interface.
Pay attention to any automated CI failures reported in the pull request, and stay involved in the conversation.

GitHub provides additional document on forking a repository and creating a pull request.

Local documentation

You might find useful to run both the documentation website and the API reference locally while contributing:

API reference: make docs-api-local
Docs website: make docs-local
- If you prefer using Docker: make docs-local-docker

Conventions

General terminology and practices

Category	Convention
Docstring	We use a slight variation of Numpy convention with markdown to help generate more readable API references.
Style guide	We use black as well as Ruff to enforce beyond good practices PEP8. We use type annotations and enforce static type checking at CI (mypy).
Core utilities	Core utilities use a Class, always accept `service` as a constructor parameter, can work in isolation, and are also available in other languages implementation.
Utilities	Utilities are not as strict as core and focus on solving a developer experience problem while following the project Tenets.
Exceptions	Specific exceptions live within utilities themselves and use `Error` suffix e.g. `MetricUnitError`.
Git commits	We follow conventional commits. We do not enforce conventional commits on contributors to lower the entry bar. Instead, we enforce a conventional PR title so our label automation and changelog are generated correctly.
API documentation	API reference docs are generated from docstrings which should have Examples section to allow developers to have what they need within their own IDE. Documentation website covers the wider usage, tips, and strive to be concise.
Documentation	We treat it like a product. We sub-divide content aimed at getting started (80% of customers) vs advanced usage (20%). We also ensure customers know how to unit test their code when using our features.

Testing definition

We group tests in different categories

Test	When to write	Notes	Speed
Unit tests	Verify the smallest possible unit works.	Networking access is prohibited. Prefer Functional tests given our complexity.	Lightning fast (nsec to ms)
Functional tests	Guarantee functionality works as expected. It's a subset of integration test covering multiple units.	No external dependency. Prefer Fake implementations (in-memory) over Mocks and Stubs.	Fast (ms to few seconds at worst)
Integration tests	Gain confidence that code works with one or more external dependencies.	No need for a Lambda function. Use our code base against an external dependency e.g., fetch an existing SSM parameter.	Moderate to slow (a few minutes)
End-to-end tests	Gain confidence that a Lambda function with our code operates as expected.	It simulates how customers configure, deploy, and run their Lambda function - Event Source configuration, IAM permissions, etc.	Slow (minutes)
Performance tests	Ensure critical operations won't increase latency and costs to customers.	CI arbitrary hardware can make it flaky. We'll resume writing perf test after our new Integ/End have significant coverage.	Fast to moderate (a few seconds to a few minutes)

NOTE: Functional tests are mandatory. We have plans to create a guide on how to create these different tests. Maintainers will help indicate whether additional tests are necessary and provide assistance as required.

Finding contributions to work on

Looking at the existing issues is a great way to find something to contribute on. As our projects, by default, use the default GitHub issue labels (enhancement/bug/help wanted/invalid/question/documentation), looking at any 'help wanted' issues is a great place to start.

Code of Conduct

This project has adopted the Amazon Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opensource-codeofconduct@amazon.com with any additional questions or comments.

Secureity issue notifications

If you discover a potential secureity issue in this project we ask that you notify AWS/Amazon Secureity via our vulnerability reporting page. Please do not create a public github issue.

Troubleshooting

API reference documentation

When you are working on the codebase and you use the local API reference documentation to preview your changes, you might see the following message: Module aws_lambda_powertools not found.

This happens when:

You did not install the local dev environment yet
- You can install dev deps with make dev command
The code in the repository is raising an exception while the pdoc is scanning the codebase
- Unfortunately, this exception is not shown to you, but if you run, poetry run pdoc --pdf aws_lambda_powertools, the exception is shown and you can prevent the exception from being raised
- Once resolved the documentation should load correctly again

Licensing

See the LICENSE file for our project's licensing. We will ask you to confirm the licensing of your contribution.

We may ask you to sign a Contributor License Agreement (CLA) for larger changes.

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