Исходники и презентации

lessons/contexts/graceful_shutdown/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"time"
+)
+
+func main() {
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer stop()
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		_, _ = io.WriteString(w, "hello world\n")
+	})
+
+	server := &http.Server{
+		Addr: ":8888",
+	}
+
+	go func() {
+		err := server.ListenAndServe()
+		if err != nil && err != http.ErrServerClosed {
+			log.Print(err.Error()) // exit
+		}
+	}()
+
+	<-ctx.Done()
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	cancel()
+
+	if err := server.Shutdown(ctx); err != nil {
+		log.Print(err.Error())
+	}
+
+	fmt.Println("canceled")
+}