Rate limiting for go-redis

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This package is based on rwz/redis-gcra and implements GCRA (aka leaky bucket) for rate limiting based on Redis. The code requires Redis version 3.2 or newer since it relies on replicate_commands feature.

Installation

redis_rate supports 2 last Go versions and requires a Go version with modules support. So make sure to initialize a Go module:

go mod init github.com/my/repo

And then install redisrate/v10 (note **_v10** in the import; omitting it is a popular mistake):

go get github.com/go-redis/redis_rate/v10

Example

package redis_rate_test

import (
    "context"
    "fmt"

    "github.com/redis/go-redis/v9"
    "github.com/go-redis/redis_rate/v10"
)

func ExampleNewLimiter() {
    ctx := context.Background()
    rdb := redis.NewClient(&redis.Options{
        Addr: "localhost:6379",
    })
    _ = rdb.FlushDB(ctx).Err()

    limiter := redis_rate.NewLimiter(rdb)
    res, err := limiter.Allow(ctx, "project:123", redis_rate.PerSecond(10))
    if err != nil {
        panic(err)
    }
    fmt.Println("allowed", res.Allowed, "remaining", res.Remaining)
    // Output: allowed 1 remaining 9
}