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.

Next, we need to define the handler function

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)
    }
}

In the above code, we use the

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.

In addition to request routing, we may also need to perform certain filtering on requests, such as permission verification, parameter checking, etc. The gorilla/mux library provides middleware functions that can help us implement request filtering.

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)
    })
}

The above code defines a middleware function named

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.

Using middleware functions can easily filter requests. We can use the

Use method to register in the router.

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

In the above code, we use the

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.

Through the above sample code, we can see how to solve the request routing and request filtering problems of concurrent network requests in the Go language. Routing rules and middleware functions can be easily defined using the gorilla/mux library to achieve efficient concurrent network request processing. Of course, in addition to the gorilla/mux library, there are many other excellent third-party libraries that can be used to solve this problem. Developers can choose the appropriate library to use according to their own needs.

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