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redis-cell

A Redis module that provides rate limiting in Redis as a single command

A Redis module that provides rate limiting in Redis as a single command. Implements the fairly sophisticated generic cell rate algorithm (GCRA) which provides a rolling time window and doesn’t depend on a background drip process.

The primitives exposed by Redis are perfect for doing work around rate limiting, but because it’s not built in, it’s very common for companies and organizations to implement their own rate limiting logic on top of Redis using a mixture of basic commands and Lua scripts (I’ve seen this at both Heroku and Stripe for example). This can often result in naive implementations that take a few tries to get right. The directive of redis-cell is to provide a language-agnostic rate limiter that’s easily pluggable into many cloud architectures.

Informal benchmarks show that redis-cell is pretty fast, taking a little under twice as long to run as a basic Redis SET (very roughly 0.1 ms per command as seen from a Redis client).

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