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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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