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graphql-engine/v3/CONTRIBUTING.md
Daniel Harvey 39c45de522 Add UNSTABLE_FEATURES env var (#652) 
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## Description

We'd like to be able to test new WIP experimental features. This adds a
`UNSTABLE_FEATURES` env var / command line arg that can be passed a
comma separated list of names.

Currently we accept `UNSTABLE_FEATURES=enable-boolean-expression-types`
but in future users could pass
`UNSTABLE_FEATURES=some-fancy-feature,other-feature,great`.

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## Changelog

- Add a changelog entry (in the "Changelog entry" section below) if the
changes
  in this PR have any user-facing impact. See
[changelog
guide](https://github.com/hasura/graphql-engine-mono/wiki/Changelog-Guide).
- If no changelog is required ignore/remove this section and add a
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### Product

_(Select all products this will be available in)_

- [x] community-edition
- [x] cloud
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### Type

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_(Select only one. In case of multiple, choose the most appropriate)_

- [ ] highlight
- [x] enhancement
- [ ] bugfix
- [ ] behaviour-change
- [ ] performance-enhancement
- [ ] security-fix
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### Changelog entry

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Add `UNSTABLE_FEATURES` environment variable

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V3_GIT_ORIGIN_REV_ID: 3562c1341d4ea3a512626110dbd2b055425c1d60
2024-06-03 08:50:43 +00:00

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V3 Contributing Guide

Getting Started

Using Docker

Start a development container (which includes NDC agents for testing):

docker compose run --build --rm dev_setup bash

Without Docker

You will need to install some packages:

  • The Rust compiler
  • protobuf-compiler

For development, you may need to install some additional tools such as nextest. See the Dockerfile.

Building the source

If the dependencies are correctly installed as above, you should now be able to run

cargo build

From here, you can follow the instructions in <README.md> to set up a working server.

Installing project dependencies with Nix

We maintain a Nix Flake that will install all of the project dependencies required to work on v3-engine.

To use it:

  1. Install Nix
  2. Run nix develop in the project root. This starts a new shell which exposes the Nix project dependencies on your $PATH, and can be exited with exit.
  3. Type echo $IN_NIX_SHELL to confirm you're in a Nix shell. It should print "impure".
  4. Run which rustc to verify that the Rust compiler is being provided by Nix. You should see a path starting with /nix/store/ and ending in /bin/rustc.

We also supply configuration for direnv to allow autoloading the Nix dependencies upon entering the project folder.

To use this:

  1. Install direnv:
  2. Install the direnv program
  3. Add the direnv hook to your shell
  4. Open a new terminal
  5. cp .envrc.local.example .envrc.local
  6. Run direnv allow
  7. Nix should now install project dependencies and put them in your $PATH whenever you enter the project folder.
  8. Type echo $IN_NIX_SHELL to confirm you're in a Nix shell. It should print "impure".
  9. Run which rustc to verify that the Rust compiler is being provided by Nix. You should see a path starting with /nix/store/ and ending in /bin/rustc.

Unstable features

When starting the engine, you can use the UNSTABLE_FEATURES env var to enable work in progress features. Currently available:

  • enable-boolean-expression-types - allow the new BooleanExpressionType metadata kind

Additional Reading