teardown.go

	// install the signal handler
	sigs, sigdone := make(chan os.Signal, 2), make(chan bool)
	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
	go func() {
		<-sigs
		close(sigdone)
	}()

	// install the workers
	teardown := make(chan bool)
	workerdone := make(chan bool)
	go func() { <-teardown }()

	// install the server
	srv := &http.Server{}
	srvdone := make(chan bool)
	go func() {
		srv.ListenAndServe()
		close(srvdone)
	}()

	// wait for something to happen
	select {
	case <-sigdone:
	case <-srvdone:
	}

	// stop server
	ctx, fn := context.WithTimeout(context.Background(), time.Second)
	srv.Shutdown(ctx)
	fn()

	close(teardown) // stop workers

	// dont wait forever
	select {
	case <-time.After(time.Second):
	case <-workerdone:
	}