An article explaining in detail how to use the current limiting function of GS Admin

This article will introduce you to the use of the current limiting function of GS Admin. GS Admin=gin scui is an enterprise-level backend developed by golang. Let’s take a look at how to use it~ I hope it will be helpful to everyone.

Warehouse

giee: gitee.com/kevn/gsadmin/tree/master
github: github.com/sonhineboy/gsadmin

Explanation

In the daily operation process of the website, When the number of concurrencies reaches the threshold of our service, we can ensure service availability through current limiting. [Recommended: golang tutorial]

Common current limiting methods:

1. Use buffered chann. When chan is full, Deny service or give a friendly prompt or jump to a friendly page, etc.

　2. The counter only accepts 100 requests within 10 seconds. When the number exceeds 100 requests, the service is refused. When the number exceeds 10 seconds, the count returns to zero and the request is accepted again.

　3. Use the frequency limit of httpserver, no need to implement it yourself.

　4. Token bucket algorithm: Put tokens into the token bucket at a constant speed. When a request comes, the token is obtained from the token bucket for subsequent requests. When the token fails to be obtained, will be dealt with in a friendly manner.

　5. Leaky bucket algorithm: The request first enters the leaky bucket, and the leaky bucket processes the requests at a fixed rate. When the number of requests exceeds the capacity of the leaky bucket, it will Exceeding requests will be handled in a friendly manner and are not suitable for sudden request scenarios.

The difference between the two token algorithms above: the leaky bucket algorithm can forcibly limit the transmission rate, and the token bucket algorithm: can limit the average transmission rate and allow certain bursts Condition.

GS Admin current limiting method

GS Admin uses golang and has a very useful current limiter time/rate located at golang.org/x/time/rate For specific usage, please refer to official documentation. GS Admin has encapsulated the web middleware. You only need to configure the appropriate parameters in the configuration file.

rate:
  limit: 15 //每秒产生得令牌数量
  burst: 2 //令牌得大小

After testing, if the current limit is exceeded, the middleware will be triggered. The code is as follows

func Limiter() gin.HandlerFunc {
    return func(c *gin.Context) {
        if global.Limiter.Allow() == false {
            global.Response{}.Failed(c, "当前请求过快，请稍后再试！")
            c.Abort()
            return
        }
        c.Next()
    }
}

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