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Microservice request forwarding and proxy tool based on Go language
Overview
With the popularity of microservice architecture, more and more systems integrate functional modules Split into independent services. But in actual applications, calls between services usually need to go through API gateways or request forwarding and proxy tools. This article introduces an implementation method of microservice request forwarding and proxy tool based on Go language, and provides corresponding code examples.
Functional requirements
Our request forwarding and proxy tool should have the following functions:
Implementation ideas
Based on the above functional requirements, we can use the following steps to implement microservice request forwarding and proxy tools:
Code Example
A simple example is provided here to demonstrate how to use Go language to implement microservice request forwarding and proxy tools based on configuration files.
package main import ( "fmt" "io/ioutil" "log" "net/http" "net/url" "strings" ) func main() { // 加载配置文件 config := loadConfig("config.ini") // 监听指定端口 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // 获取请求路径 path := r.URL.Path // 查找对应的微服务地址 serviceURL, ok := config[path] if !ok { http.Error(w, "Invalid request path", http.StatusBadRequest) return } // 构建目标URL targetURL := fmt.Sprintf("%s%s", serviceURL, r.URL.RawQuery) // 发起请求 resp, err := http.Get(targetURL) if err != nil { log.Printf("Failed to proxy request: %v", err) http.Error(w, "Failed to proxy request", http.StatusInternalServerError) return } // 将微服务的响应返回给客户端 defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if err != nil { log.Printf("Failed to read response body: %v", err) http.Error(w, "Failed to read response body", http.StatusInternalServerError) return } w.Write(body) }) log.Println("Proxy server started on port 8080") log.Fatal(http.ListenAndServe(":8080", nil)) } func loadConfig(filename string) map[string]string { // 解析配置文件 // 例如: // /user -> http://user-service:8000 // /order -> http://order-service:8000 config := make(map[string]string) config["/user"] = "http://user-service:8000" config["/order"] = "http://order-service:8000" return config }
In the above code example, we first loaded the configuration file config.ini
and configured the microservice interface that needs to be forwarded and its corresponding address. Then we created an HTTP server listening on port 8080. When we receive a request from the client, we find the address of the microservice that needs to be forwarded based on the path of the request, and forward the request to that address. Finally, the response from the microservice is returned to the client.
Summary
This article introduces an implementation method of microservice request forwarding and proxy tools based on Go language. Through this tool, we can easily forward requests between microservices and return the response of the microservice to the client. Of course, actual application scenarios are usually more complex. We can also perform secondary development of the tool according to needs and add more functions to meet actual needs.
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