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README.md

speedbump GoDoc

A Redis-backed Rate Limiter for Go

wercker status

Cool stuff

  • Backed by Redis, so it keeps track of requests across a cluster
  • Extensible timing functions. Includes defaults for tracking requests per second, minute, and hour
  • Works with IPv4, IPv6, or any other unique identifier
  • Example middleware included for Gin (See: ginbump) and Negroni (See: negronibump)

Versions

Branch Go Get Command Client Version -
v2 go get gopkg.in/etcinit/speedbump.v2 gopkg.in/redis.v5 Link
v1, master go get gopkg.in/etcinit/speedbump.v1 gopkg.in/redis.v3 Link
v0 go get gopkg.in/etcinit/speedbump.v0 gopkg.in/redis.v2 Link

Usage

  • Get a working Redis server
  • Go get:
$ go get github.com/etcinit/speedbump
  • Include it in your code
package main

import (
	"fmt"
	"time"

	"github.com/etcinit/speedbump"
	"gopkg.in/redis.v5"
)

func main() {
	client := redis.NewClient(&redis.Options{
		Addr:     "localhost:6379",
		Password: "",
		DB:       0,
	})
	hasher := speedbump.PerSecondHasher{}

	// Here we create a limiter that will only allow 5 requests per second
	limiter := speedbump.NewLimiter(client, hasher, 5)

	for {
		// This example has a hardcoded IP, but you would replace it with the IP
		// of a client on a real case.
		success, err := limiter.Attempt("127.0.0.1")

		if err != nil {
			panic(err)
		}

		if success {
			fmt.Println("Successful!")
		} else {
			fmt.Println("Limited! :(")
		}

		time.Sleep(time.Millisecond * time.Duration(100))
	}
}
  • Output:
Successful!
Successful!
Successful!
Successful!
Successful!
Successful!
Limited! :(
Limited! :(
Limited! :(
Limited! :(
Limited! :(
Successful!
Successful!
Successful!
Successful!
Successful!
Successful!
Limited! :(
Limited! :(
Limited! :(
Limited! :(
Successful!
Successful!
...