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*http.Server in Go 1.8 supports graceful shutdown. This is a small example.
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| package main | |
| import ( | |
| "context" | |
| "log" | |
| "net/http" | |
| "os" | |
| "os/signal" | |
| "time" | |
| ) | |
| type Server struct { | |
| logger *log.Logger | |
| mux *http.ServeMux | |
| } | |
| func NewServer(options ...func(*Server)) *Server { | |
| s := &Server{ | |
| logger: log.New(os.Stdout, "", 0), | |
| mux: http.NewServeMux(), | |
| } | |
| for _, f := range options { | |
| f(s) | |
| } | |
| s.mux.HandleFunc("/", s.index) | |
| return s | |
| } | |
| func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| s.mux.ServeHTTP(w, r) | |
| } | |
| func (s *Server) index(w http.ResponseWriter, r *http.Request) { | |
| s.logger.Println("GET /") | |
| w.Write([]byte("Hello, World!")) | |
| } | |
| func main() { | |
| stop := make(chan os.Signal, 1) | |
| signal.Notify(stop, os.Interrupt) | |
| logger := log.New(os.Stdout, "", 0) | |
| addr := ":" + os.Getenv("PORT") | |
| if addr == ":" { | |
| addr = ":2017" | |
| } | |
| s := NewServer(func(s *Server) { s.logger = logger }) | |
| h := &http.Server{Addr: addr, Handler: s} | |
| go func() { | |
| logger.Printf("Listening on http://0.0.0.0%s\n", addr) | |
| if err := h.ListenAndServe(); err != nil { | |
| logger.Fatal(err) | |
| } | |
| }() | |
| <-stop | |
| logger.Println("\nShutting down the server...") | |
| ctx, _ := context.WithTimeout(context.Background(), 5*time.Second) | |
| h.Shutdown(ctx) | |
| logger.Println("Server gracefully stopped") | |
| } |
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