How to stop http.ListenAndServe()

Question

I am using the Mux library from Gorilla Web Toolkit along with the bundled Go http server.

The problem is that in my application the HTTP server is only one component and it is required to stop and start at my discretion.

When I call http.ListenAndServe(fmt.Sprintf(":%d", service.Port()), service.router) it blocks and I cannot seem to stop the server from running.

I am aware this has been a problem in the past, is that still the case? Are there any new solutions?

Answer 1

Regarding graceful shutdown (introduced in Go 1.8), a bit more concrete example:

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") }