u-na-gi / async-google-apis

Generate Asynchronous Google API stubs for Rust!

async-google-apis

This software generates asynchronous API stubs for Google APIs (and most likely any other API described by a Discovery document). It uses yup-oauth2 for the authorization logic.

This project is still experimental. While for many complex APIs (Cloud Storage, Drive v3, Sheets v4) usable APIs including types and documentation are generated successfully, this doesn't mean that it will work on any other current or future Google API.

What it looks like

There are examples in this repository:

• for Google Calendar
• for YouTube
• for Google Cloud Storage
• for Google Drive

Also consider the documentation of these exemplary APIs:

• calendar:v3 for Google Calendar.
• drive:v3 for Google Drive.
• storage:v1 for Google Cloud Storage.
• youtube:v3 for Youtube.

Parts

• generate contains a Python program fetching current Google Discovery documents (https://www.googleapis.com/discovery/v1/apis, see documentation) and generating Rust code in the generate/gen directory. This is done very non-fancily using a few mustache templates and the chevron package. The script only takes two parameters, which you can discover using --help. In short, to generate an API stub for the API with ID storage:v1 (Google Cloud Storage v1), run

  $ pipenv run ./generate.py --apis=storage:v1

  (install pipenv using pip install --user pipenv && pipenv sync before, if you don't have it yet). See more details in that directory.
• Consult drive_example or gcs_example for simple but useful examples of using the generated code. As you can see, it is reasonably easy! Use cargo doc to generate the documentation for generated code, as the API comments is translated into Rust doc comments. I try keeping them up-to-date as the API of the generated code occasionally changes.
• async-google-apis-common contains shared code, for example the HTTP logic, used by the generated code, as well as some types (like errors) and as well as all imports. Include this crate in your dependencies when you are using the generated code in your project.
• NOTE: some parts of the API -- for example: URL query parameters that are not represented as enums -- may require small manual adjustments to the generated code. If possible, this should be solved automatically, but sometimes it isn't yet. Refer to the example crates for more details.

To Do

• Integration tests: E.g. by writing a custom JSON service description and an accompanying server binary to run test code against.