rate-limiter

This package provides a rate limiter in Go (Golang) with a middleware adaptable for Gin web servers.

Installation

• Download

  Type the following command in your terminal.

  go get github.com/go-redis/redis
  go get github.com/codeNino/ratelimiter

• Import

  import "github.com/go-redis/redis"
  import limiter "github.com/codeNino/ratelimiter"
  import "time"

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Quickstart

• Create a limiter object

  // Set redis client
  rdb := redis.NewClient(&redis.Options{Addr: "localhost:6379", Password: "", DB: 0})
  
  // set up rate limiter object
  cop := &limiter.RateLimiter{
      TotalLimit : 100, BurstLimit : 10,
      MaxTime :  time.Hour * 24,   BurstPeriod : time.Hour * 2
      Client : rdb,  TotalLimitPrefix : "TotalLimitPrefixForRandomService"
      BurstLimitPrefix : "BurstLimitPrefixForRandomService"
  }

• Add different rate limiter type middleware to controlling each route.

  server := gin.Default()
  
  // create middleware for 
  
  server.POST("/ExamplePost1", limiter.IPLimiter(cop), func(ctx *gin.Context) {
  	ctx.String(http.StatusOK, "Hello ExamplePost1")
  })
  
  server.GET("/ExampleGet1", limiter.UserLimiter(cop, "sample_user_id"), func(ctx *gin.Context) {
  	ctx.String(http.StatusOK, "Hello ExampleGet1")
  })
  
  err = server.Run(":8080")
  if err != nil {
  	log.Println("gin server error = ", err)
  }

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Response

• When the consecutive requests and total request times is within limit, the request is allowed to continue.

• When limit is reached, the request is aborted and a 429 HTTP status code is sent.

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License

All source code is licensed under the MIT License.