signal_notify_context.go

// Go1.16+'s signal.NotifyContext to concisely handle graceful shutdowns on OS interrupts.
// Simple example from original submitter: https://henvic.dev/posts/signal-notify-context/

func main() {
	// Pass a context with a timeout to tell a blocking function that it
	// should abandon its work after the timeout elapses.
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
	defer stop()

	select { // blocks until
	case <-time.After(10 * time.Second):
		fmt.Println("missed signal")
	case <-ctx.Done():
		stop()
		fmt.Println("signal received")
	}
}

// <Go1.16's approach
func main() {
	ctx, cncl := context.WithCancel(context.Background())
	defer cncl()

	signals := make(chan os.Signal, 1) // channel to intercept OS cmds
	signal.Notify(signals, os.Interrupt)
  
	go func() {
		select {
		case <-signals:
			cncl()
		case <-ctx.Done():
		}
	}()
}