Smoothie

A dead simple distributed rate limiter that smoothes your day.

Yet another rate limiter?

Smoothie is meant to be a distributed rate limiter, unlike all other popular within go community solutions. The project is quite small so, it doesn't make any sense to publish it as a package. But it can be a good showcase of how to make a distributed rate limiter using redis and Go. If you don't need that or maybe you don't like Redis, then standard time package or rate package might serve you better.

Implementation details

At the moment smoothie implements a fixed-size window strategy for limiting requests. The api resembles the familiar rate package API with Allow and Exec methods. See example below

config := redis.Options{
	Addr:     "localhost:6379",
	Password: "",
	DB:       0,
}
limiter := New(&testRedisOptions, Rate{NumberOfRequests: 1, Duration: 5 * time.Second})
isAllowed := limiter.Allow(ctx.Background(), "user-IP-address")
testEffect := func () error {
    fmt.Println("hello")
    return nil
}
err := limiter.Exec(ctx.Background(), "user-IP-adress", testEffect)

Future plans

It would be nice to add the following things to the smoothie:

• other rate limiting strategies (Sliding window, token bucket)
• extend tests with test cases with concurrent access to the same limiting key