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A library for throttling algorithms

Project description

This library is intended to be a collection of algorithms that can be reused when throttling user interactions with a resource (e.g., an API).

This library is still a work in progress. See goals for what we’re striving for.


pip install rush


Below is the project’s list of goals broken down by category


  • A basic periodic interval rate limiter - N accesses per period of time. An example would be the GitHub API that limits authenticated users to 5,000 requests per hour.
  • A leaky bucket rate limiter based off of the Generic Cell Ratelimiting Algorithm (a.k.a, GCRA).
  • A Redis storage backend for rate limit results so that users can have state persisted across machines and application restarts.
  • A Redis GCRA implementation, likely borrowed from Ruby’s redis-gcra gem.


  • 100% test coverage
  • Code auto-formatted by Black (CI will check if formatting wasn’t run prior to push)
  • Commit messages following a uniform Kernel-like style
  • Flake8, pylint, mypy, and bandit linting
  • Complete type annotations
  • Complete documentation linted by doclint and strictly compiled by Sphinx


  • Composable - ability to confidently use one algorithmic limiter with any properly written storage backend
  • Easy to understand - hopefully it will be easy to understand how the library works because of how composable it will be

Project details

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