Golang uses Channel to build a high concurrent HTTP server

introduction

In network application development, high concurrency is a very important issue. If the server's processing power cannot meet the needs of a large number of requests, the system is likely to be paralyzed. Therefore, building a highly concurrent server is the key to responding to the increase in network requests.

As an efficient language, Golang also performs very well in network programming. It provides a lightweight thread goroutine to handle requests, using Channel as a message queue, enabling a highly concurrent HTTP server. This article will explain how to use Golang and Channel to form a high concurrent HTTP server.

Code Analysis

First, define the request structureRequestand response structureResponse, including request method, request URL, request parameters, request body, response status code, response message and other information.

type Request struct {
    Method  string
    URL     string
    Params  map[string]string
    Body    []byte
}
type Response struct {
    StatusCode int
    Message    string
    Body       []byte
}

Then, define the message queueChanneland start multipleGoroutineProcess the request. Each request fromHTTPRead the request data in the request and put it inChannelIn, thenGoroutineProcess and return the response result, and the response result passesChannelSend backHTTPThe request handler.

func main() {
    requests := make(chan Request, 100)
    responses := make(chan Response, 100)
    // Start multiple Goroutines to process requests    for i := 0; i &lt; 10; i++ {
        go handleRequests(requests, responses)
    }
    ("/", func(w , r *) {
        // Read request data from HTTP request        req := Request{Method: , URL: (), Params: }
        body, _ := ()
         = body
        // Send request data to the message queue        requests &lt;- req
        // Wait for Goroutine to process the request and return the response data        resp := &lt;-responses
        ()
        ()
    })
    (":8080", nil)
}
func handleRequests(requests chan Request, responses chan Response) {
    for {
        req := &lt;-requests
        // Process the request        resp := processRequest(req)
        // Send response data to the message queue        responses &lt;- resp
    }
}
func processRequest(req Request) Response {
    // Implement request processing logic    // Return response data    return Response{
        StatusCode: 200,
        Message:    "OK",
        Body:       []byte("Request processed successfully."),
    }
}

Finally, the complete code looks like this:

package main
import (
    "io/ioutil"
    "net/http"
)
type Request struct {
    Method  string
    URL     string
    Params  map[string]string
    Body    []byte
}
type Response struct {
    StatusCode int
    Message    string
    Body       []byte
}
func main() {
    requests := make(chan Request, 100)
    responses := make(chan Response, 100)
    // Start multiple Goroutines to process requests    for i := 0; i &lt; 10; i++ {
        go handleRequests(requests, responses)
    }
    ("/", func(w , r *) {
        // Read request data from HTTP request        req := Request{Method: , URL: (), Params: }
        body, _ := ()
         = body
        // Send request data to the message queue        requests &lt;- req
        // Wait for Goroutine to process the request and return the response data        resp := &lt;-responses
        ()
        ()
    })
    (":8080", nil)
}
func handleRequests(requests chan Request, responses chan Response) {
    for {
        req := &lt;-requests
        // Process the request        resp := processRequest(req)
        // Send response data to the message queue        responses &lt;- resp
    }
}
func processRequest(req Request) Response {
    // Implement request processing logic    // Return response data    return Response{
        StatusCode: 200,
        Message:    "OK",
        Body:       []byte("Request processed successfully."),
    }
}

Unit Testing

To verify the correctness of the code, we need to write unit tests. Unit testing needs to override HTTP request and response processing logic and concurrency control to ensure code quality.

package main
import (
    "io/ioutil"
    "net/http"
    "net/http/httptest"
    "testing"
)
func TestHTTPServer(t *) {
    requests := make(chan Request, 100)
    responses := make(chan Response, 100)
    for i := 0; i < 10; i++ {
        go handleRequests(requests, responses)
    }
    ts := ((func(w , r *) {
        req := Request{Method: , URL: (), Params: }
        body, _ := iouti

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