英文:
Process concurrent HTTP requests in Golang
问题
我正在尝试处理一个包含200个URL的文件，并使用每个URL进行HTTP请求。每次最多同时处理10个URL（代码应该在10个URL完成处理之前阻塞）。我尝试用Go解决这个问题，但是我一直得到整个文件都被处理，并创建了200个并发连接。
你应该怎么做呢？
英文:
I'm trying to process a file which contains 200 URLs and use each URL to make an HTTP request. I need to process 10 URLs concurrently maximum each time (code should block until 10 URLs finish processing). Tried to solve it in go but I keep getting the whole file processed with 200 concurrent connection created.
for scanner.Scan() { // loop through each url in the file// send each url to golang HTTPrequestgo HTTPrequest(scanner.Text(), channel, &wg)}fmt.Println(<-channel)wg.Wait()
What should i do?
答案1
得分: 9
一个包含10个goroutine的池子，从一个通道中读取数据，应该能满足你的需求。
work := make(chan string)// 获取原始的200个URLvar urlsToProcess []string = seedUrls()// 启动一个包含10个goroutine的池子，并从work通道中读取URLfor i := 0; i <= 10; i++ {go func(w chan string) {url := <-w}(work)}// 将URL写入work通道，阻塞直到一个worker goroutine能够开始工作for _, url := range urlsToProcess {work <- url}
清理和请求结果留给你自己来完成。Go通道会阻塞，直到其中一个worker例程能够读取数据。
英文:
A pool of 10 go routines reading from a channel should fulfill your requirements.
work := make(chan string)// get original 200 urlsvar urlsToProcess []string = seedUrls()// startup pool of 10 go routines and read urls from work channelfor 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 workfor _, url := range urlsToProcess {work <- url}
Cleanup and request results are left as an exercise for you. Go channels is will block until one of the worker routines is able to read.
答案2
得分: 2
像这样的代码
longTimeAct := func(index int, w chan struct{}, wg *sync.WaitGroup) {defer wg.Done()time.Sleep(1 * time.Second)println(index)<-w}wg := new(sync.WaitGroup)ws := make(chan struct{}, 10)for i := 0; i < 100; i++ {ws <- struct{}{}wg.Add(1)go longTimeAct(i, ws, wg)}wg.Wait()
英文:
code like this
longTimeAct := func(index int, w chan struct{}, wg *sync.WaitGroup) {defer wg.Done()time.Sleep(1 * time.Second)println(index)<-w}wg := new(sync.WaitGroup)ws := make(chan struct{}, 10)for i := 0; i < 100; i++ {ws <- struct{}{}wg.Add(1)go longTimeAct(i, ws, wg)}wg.Wait()
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