Ejemplo n.º 1
0
func connect(addr string) error {
	nc, err := net.Dial("tcp", *serverAddr)
	if err != nil {
		return err
	}
	defer nc.Close()
	c := batt.NewConn(nc)
	err = c.Write(batt.Message{"hello", url.Values{
		"k": []string{batt.Secret},
		"p": platforms,
	}})
	if err != nil {
		return err
	}
	m, err := c.Read()
	if err != nil {
		return err
	}
	if m.Verb != "hello" {
		return fmt.Errorf(`expected "hello", got %q`, m.Verb)
	}
	errc := make(chan error, 1)
	done := make(chan bool, 1)
	go func() {
		for {
			m, err := c.Read()
			if err != nil {
				errc <- err
				return
			}
			select {
			case in <- m:
			case <-done:
				return
			}
		}
	}()
	go func() {
		for {
			var m batt.Message
			select {
			case m = <-out:
			case <-done:
				return
			}
			if err := c.Write(m); err != nil {
				errc <- err
				return
			}
		}
	}()
	err = <-errc
	done <- true // shut down other goroutine
	return err
}
Ejemplo n.º 2
0
func handleWorkerConn(nc net.Conn) {
	defer nc.Close()
	addr := nc.RemoteAddr()

	boot := make(chan string, 1)
	defer func() {
		var reason string
		select {
		case reason = <-boot:
		default:
		}
		log.Printf("Worker conn %s disconnected; reason=%v", addr, reason)
	}()

	log.Printf("Got potential worker connection from %s", addr)

	// They get 5 seconds to authenticate.
	authTimer := time.AfterFunc(5*time.Second, func() {
		boot <- "login timeout"
		nc.Close()
	})

	c := batt.NewConn(nc)
	m, err := c.Read()
	if err != nil {
		boot <- fmt.Sprintf("inital message read error: %v", err)
		return
	}
	if m.Verb != "hello" {
		boot <- "speaking while not authenticated"
		return
	}
	if batt.Secret == "" || m.Get("k") != batt.Secret {
		boot <- fmt.Sprintf("bad password; want %q", batt.Secret)
		return
	}
	authTimer.Stop()

	platforms := m.Values["p"]
	log.Printf("Worker conn %s authenticated; working for clients: %+v", addr, platforms)
	c.Write(batt.Message{Verb: "hello"})

	w := &Worker{
		Addr:      addr.String(),
		Platforms: platforms,
		Conn:      c,
		in:        make(chan interface{}),
	}
	registerWorker(w)
	defer unregisterWorker(w)
	defer close(w.in)

	go w.loop()
	for {
		m, err := c.Read()
		if err != nil {
			boot <- fmt.Sprintf("message read error: %v", err)
			log.Printf("Worker conn %v shut down: %v", addr, err)
			return
		}
		w.in <- m
	}
	panic("unreachable")
}