go - 如何停止 http.ListenAndServe()

Question

我正在使用来自 Gorilla Web Toolkit 的 Mux 库以及捆绑的 Go http 服务器。

问题是，在我的应用程序中，HTTP 服务器只是一个组件，需要我自行决定停止和启动。

当我调用 http.ListenAndServe(fmt.Sprintf(":%d", service.Port()), service.router) 时，它会阻塞，我似乎无法阻止服务器运行.

我知道这在过去一直是个问题，现在仍然如此吗？有没有新的解决方案？

Answer 1

关于优雅关闭(在 Go 1.8 中引入)，一个更具体的例子:

package main

import (
    "context"
    "io"
    "log"
    "net/http"
    "sync"
    "time"
)

func startHttpServer(wg *sync.WaitGroup) *http.Server {
    srv := &http.Server{Addr: ":8080"}

    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        io.WriteString(w, "hello world\n")
    })

    go func() {
        defer wg.Done() // let main know we are done cleaning up

        // always returns error. ErrServerClosed on graceful close
        if err := srv.ListenAndServe(); err != http.ErrServerClosed {
            // unexpected error. port in use?
            log.Fatalf("ListenAndServe(): %v", err)
        }
    }()

    // returning reference so caller can call Shutdown()
    return srv
}

func main() {
    log.Printf("main: starting HTTP server")

    httpServerExitDone := &sync.WaitGroup{}

    httpServerExitDone.Add(1)
    srv := startHttpServer(httpServerExitDone)

    log.Printf("main: serving for 10 seconds")

    time.Sleep(10 * time.Second)

    log.Printf("main: stopping HTTP server")

    // now close the server gracefully ("shutdown")
    // timeout could be given with a proper context
    // (in real world you shouldn't use TODO()).
    if err := srv.Shutdown(context.TODO()); err != nil {
        panic(err) // failure/timeout shutting down the server gracefully
    }

    // wait for goroutine started in startHttpServer() to stop
    httpServerExitDone.Wait()

    log.Printf("main: done. exiting")
}