How to deal with concurrent network requests in Go language?

How to deal with concurrent network requests in Go language?

Go language is a language for developing high-concurrency applications. Its built-in concurrency mechanism makes it very convenient to handle network requests. In actual development, we often encounter situations where we need to send multiple network requests at the same time. At this time, we need to use the concurrency features of the Go language to handle it. The following will introduce how to handle concurrent network requests in the Go language through specific code examples.

In Go language, you can use goroutine and channel to achieve concurrency. Goroutine is a lightweight thread that can execute functions concurrently, and channel is a pipeline for communication between goroutines. By using goroutine and channel, we can easily implement concurrent network requests.

Let’s first briefly introduce the basic principles of concurrent network requests in the Go language, and then illustrate it through a specific example.

Basic principle:

1. Create a channel to store the results to receive the results of each request.
2. Use goroutine to send multiple network requests concurrently.
3. After each goroutine obtains the result of a request, it sends the result to the channel.
4. The main goroutine receives the result of each request by traversing the channel.

Sample code:

package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func doRequest(url string, ch chan<- string) {
    resp, err := http.Get(url)
    if err != nil {
        ch <- fmt.Sprintf("Error: %v", err)
        return
    }
    defer resp.Body.Close()

    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        ch <- fmt.Sprintf("Error: %v", err)
        return
    }

    ch <- string(body)
}

func main() {
    urls := []string{
        "https://www.baidu.com",
        "https://www.google.com",
        "https://www.github.com",
    }

    ch := make(chan string)

    for _, url := range urls {
        go doRequest(url, ch)
    }

    for i := 0; i < len(urls); i++ {
        fmt.Println(<-ch)
    }
}

In the above example, we defined a doRequest function to send network requests and send the request results to the channel. Then in the main function, we create a string slice of urls to store the request URL that needs to be sent. Then a channel ch is created to receive the request results.

In the for loop, we use the go keyword to start multiple goroutines, each goroutine is responsible for one request. And send the result to channel ch.

Finally, we receive the result of each request by looping through channel ch and print it out.

Through the above example, we can see that by using goroutine and channel, we can easily implement concurrent network request processing. At the same time, we can also perform more complex processing on the request results, such as parsing JSON data, storing database, etc.

Summary:
The concurrency mechanism of the Go language makes it very simple to handle concurrent network requests. By using goroutines and channels, we can send multiple network requests concurrently and receive the results of processing each request in the main goroutine. This method can not only improve the efficiency of the program, but also better meet the needs of large-scale high-concurrency applications. At the same time, the Go language also provides a wealth of network packages, such as net/http and http/httputil, to facilitate developers to handle more complex network requests.

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