How to solve the problem of request routing and request filtering for concurrent network requests in Go language?

How to solve the problem of request routing and request filtering for concurrent network requests in Go language?

In the Go language, concurrent network requests can be easily implemented by using goroutine and channel. However, in practical applications, we often encounter problems with request routing and request filtering, that is, different requests need to call different processing functions, and certain filtering of requests is required.

There are many third-party libraries in the Go language that can help us complete the request routing and request filtering functions, such as gorilla/mux, gin, go-chi, etc. Below we use gorilla/mux as an example to introduce how to solve these two problems in Go language.

First, we need to use the gorilla/mux library to create a router (Router), and then define different routing rules. For example, we can define a routing rule as /users/{id} to process requests starting with /users/, where {id} is a variable.

router := mux.NewRouter()
router.HandleFunc("/users/{id}", handleUserRequest)

The above code creates a router and defines a routing rule as /users/{id}. The routing rule will automatically change the id## in the requested URL. #Parameters are passed to the handleUserRequest function for processing.

handleUserRequest. In this function, we can get the parameters of the request, process the request, return the results, etc.

func handleUserRequest(w http.ResponseWriter, r *http.Request) {
    vars := mux.Vars(r)
    id := vars["id"]

    // 根据id查询用户信息
    user := getUserInfo(id)

    // 返回结果
    if user != nil {
        json.NewEncoder(w).Encode(user)
    } else {
        http.NotFound(w, r)
    }
}

mux.Vars(r) function to obtain the id parameter in the requested URL. Then we can query user information based on id and return the results to the client.

func authMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        // 进行权限验证
        if !checkAuth(w, r) {
            return
        }

        // 调用下一个中间件或处理函数
        next.ServeHTTP(w, r)
    })
}

authMiddleware for permission verification. In the middleware function, we can make some business logic judgments, such as verifying whether the Token is valid. If the verification fails, you can return directly, otherwise you can call the next middleware or processing function.

Use method to register in the router.

router := mux.NewRouter()
router.Use(authMiddleware)

Use method to register the authMiddleware middleware function in the router, so that all requests will first go through the middleware function. Permissions are verified and then handed over to the corresponding routing rules for processing.

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