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Contributing to Tempo

Before opening a pull request consider:

  • Is the change important and ready enough to ask the community to spend time reviewing?
  • Have you searched for existing, related issues and pull requests?
  • Is the change being proposed clearly explained and motivated?

When you contribute code, you affirm that the contribution is your original work and that you license the work to the project under the project's open source license. Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other means you agree to license the material under the project's open source license and warrant that you have the legal authority to do so.

Release notes

Our process to manage release notes is modelled after how the Kubernetes project handles them. This process can be separated into 2 separate phases:

  • Adding notes on each PR. Happens at PR creation time.
  • Compiling all PR notes before a release. Happens at release time.

Coding conventions

We use pre-commit to handle a number of Git hooks which ensure that all changes to the codebase follow Seldon's code conventions. It is recommended to set these up before making any change to the codebase. Extra checks down the line will stop the build if the code is not compliant to the style guide of each language in the repository.

To install it, follow the official instructions. Once installed, run:

$ pre-commit install

This will read the hooks defined in .pre-commit-config.yaml and install them accordingly on your local repository.

Tests

Regardless of the package you are working on, we abstract the main tasks to a Makefile. Therefore, in order to run the tests, you should be able to just do:

$ make test

Python

We use pytest as our main test runner. However, to ensure that tests run on the same version of the package that final users will download from pip and pypi.org, we use tox on top of it. To install both (plus other required plugins), just run:

$ make install_dev

Using tox we can run the entire test suite over different environments, isolated between them. You can see the different ones we currently use on the setup.cfg file. You can run your tests across all these environments using the standard make test mentioned above. Alternatively, if you want to pass any extra parameters, you can also run tox directly as:

$ tox

One of the caveats of tox is that, as the number of environments grows, so does the time it takes to finish running the tests. As a solution, during local development it may be recommended to run pytest directly on your own environment. You can do so as:

$ pytest

Additional system requirements for running the tests:

  • docker
  • conda: for example Miniconda, follow the steps described in this link.
  • Models artifacts: For first time, install gsutil and download the models from Seldon's Google Storage bucket:
$ make tests/testdata