Asynchronous programming practice of golang function

Asynchronous programming allows tasks to be performed without blocking the main thread. Go language uses lightweight thread goroutine and communication pipe channel to implement asynchronous programming. Goroutines are created with the go keyword, and channels are used to send and receive data between goroutines. Practical case: Concurrent web requests use a channel to receive request responses and send HTTP GET requests concurrently through goroutine. The main thread receives the response from the channel and prints the results, improving program performance and responsiveness.

Asynchronous programming practice of Go language functions

Asynchronous programming is a technology of parallel programming that allows programmers to Perform multiple tasks while blocking the main thread. In Go language, asynchronous programming can be easily implemented using goroutine and channel.

Goroutine

Goroutine is a lightweight thread in the Go language. Unlike traditional threads, goroutines are very lightweight and managed by the Go runtime. Goroutines can be created using the go keyword.

go func() {
  // 异步任务
}

channel

Channel is the pipe used by the Go language to communicate between goroutines. Channels can be used to send and receive data.

ch := make(chan int)  // 创建一个无缓冲 channel

// 向 channel 发送数据
ch <- 42

// 从 channel 接收数据
x := <-ch

Practical case: concurrent web request

The following is a practical case of asynchronous concurrent web request:

package main

import (
  "fmt"
  "net/http"
  "time"
)

func main() {
  // 创建一个 channel 来接收请求响应
  results := make(chan string)

  // 发送并发请求
  for i := 0; i < 10; i++ {
    go func(i int) {
      // 发送 HTTP GET 请求
      resp, err := http.Get(fmt.Sprintf("https://example.com/%d", i))
      if err != nil {
        results <- fmt.Sprintf("Error: %v", err)
        return
      }

      // 接收响应并发送结果
      body, err := ioutil.ReadAll(resp.Body)
      if err != nil {
        results <- fmt.Sprintf("Error: %v", err)
        return
      }

      results <- fmt.Sprintf("Response: %s", string(body))
    }(i)
  }

  // 接收并发请求的响应
  for j := 0; j < 10; j++ {
    fmt.Println(<-results)
  }
}

This program creates a channel to Receive the request response, and then start 10 goroutines to send HTTP GET requests concurrently. Each goroutine sends the result to the channel after receiving the response. The main thread receives the results from the channel and prints them to the console.

Through asynchronous programming, this program can process requests concurrently without blocking the main thread, thereby improving the performance and responsiveness of the application.

The above is the detailed content of Asynchronous programming practice of golang function. For more information, please follow other related articles on the PHP Chinese website!