Use Gin framework to implement Limiter current limiting function

With the rapid development of the Internet, the number of visits to the website is getting larger and larger, and the pressure on the server is also increasing. In order to ensure the stable operation of the server, the amount of access needs to be limited. Throttling is a common solution. This article will introduce how to use the Gin framework to implement Limiter current limiting function.

1. What is current limiting?

Current limiting refers to controlling the request flow in the system to ensure that the system can maintain stable operation even when it withstands the maximum flow. In practical applications, we can limit the number of requests for each API, the request time interval, etc.

2. Gin Framework Introduction

Gin is a Go language Web framework. It has the advantages of high performance and low memory consumption, and is suitable for building high-performance Web applications. Gin also provides functions such as middleware, routing, template engine, and custom error handling.

3. Introduction to Gin middleware

In the Gin framework, middleware is a function that can perform some operations before and after processing the request. Gin middleware is usually used to handle request headers, authentication, logging, current limiting and other functions. Middleware can be called in a chain, and a request can be processed by multiple middlewares.

4. Gin middleware implements Limiter current limiting function

In the Gin framework, we can use middleware to implement Limiter current limiting function.

We can use Gin's global middleware to limit the request traffic of the entire application, for example:

limiter := tollbooth.NewLimiter(1, nil)
router := gin.Default()
router.Use(gin.WrapH(limiter.Handler()), gin.Recovery())

Here, we use the tollbooth library to create a Limiter that will limit every second The number of requests is 1. Then, we wrap the Limiter's Handler into a middleware and add it to the route using Gin's WrapH method.

We can also use Gin's local middleware to limit the request traffic of specific routes, for example:

limiter := tollbooth.NewLimiter(1, nil)
router := gin.Default()
router.GET("/ping", gin.WrapH(limiter.Handler(gin.HandlerFunc(pingHandler))))

Here, we wrap the Limiter's Handler in the pingHandler middleware, and then Add to GET /ping route.

5. Summary

By using the Gin framework and tollbooth library, we can easily implement the Limiter current limiting function to ensure that the system can run stably. By setting global or local middleware, we can limit the number of requests for the entire application or specific routes to ensure the stability and reliability of the system.

In practical applications, we also need to flexibly set different current limiting rules according to business needs to achieve better results.

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