在Golang中处理并发HTTP请求

Question

我正在尝试处理包含200个URL的文件,并使用每个URL发出HTTP请求.我需要每次最多同时处理10个URL(代码应该阻塞,直到10个URL完成处理).试图解决它,但我继续创建处理200个并发连接的整个文件.

for scanner.Scan() { // loop through each url in the file
        // send each url to golang HTTPrequest
        go HTTPrequest(scanner.Text(), channel, &wg)
}
fmt.Println(<-channel)
wg.Wait()

我该怎么办？

Answer 1

从a读取的10个例行程序池channel应该满足您的要求.

work := make(chan string)

// get original 200 urls
var urlsToProcess []string = seedUrls() 

// startup pool of 10 go routines and read urls from work channel 
for i := 0; i<=10; i++ {
  go func(w chan string) {
     url := <-w
  }(work)
}

// write urls to the work channel, blocking until a worker goroutine
// is able to start work
for _, url := range urlsToProcess {
  work <- url
}

清理和请求结果留给您练习.Go通道将被阻塞,直到其中一个工作程序能够读取.