Example #1
0
func main() {
	flag.Parse()
	log.SetFlags(0)

	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, os.Interrupt)

	u := url.URL{Scheme: "ws", Host: *addr, Path: "/echo"}
	log.Printf("connecting to %s", u.String())

	c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)
	if err != nil {
		log.Fatal("dial:", err)
	}
	defer c.Close()

	done := make(chan struct{})

	go func() {
		defer c.Close()
		defer close(done)
		for {
			_, message, err := c.ReadMessage()
			if err != nil {
				log.Println("read:", err)
				return
			}
			log.Printf("recv: %s", message)
		}
	}()

	ticker := time.NewTicker(time.Second)
	defer ticker.Stop()

	for {
		select {
		case t := <-ticker.C:
			err := c.WriteMessage(websocket.TextMessage, []byte(t.String()))
			if err != nil {
				log.Println("write:", err)
				return
			}
		case <-interrupt:
			log.Println("interrupt")
			// To cleanly close a connection, a client should send a close
			// frame and wait for the server to close the connection.
			err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
			if err != nil {
				log.Println("write close:", err)
				return
			}
			select {
			case <-done:
			case <-time.After(time.Second):
			}
			c.Close()
			return
		}
	}
}
Example #2
0
// echoCopy echoes messages from the client using io.Copy.
func echoCopy(w http.ResponseWriter, r *http.Request, writerOnly bool) {
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Upgrade:", err)
		return
	}
	defer conn.Close()
	for {
		mt, r, err := conn.NextReader()
		if err != nil {
			if err != io.EOF {
				log.Println("NextReader:", err)
			}
			return
		}
		if mt == websocket.TextMessage {
			r = &validator{r: r}
		}
		w, err := conn.NextWriter(mt)
		if err != nil {
			log.Println("NextWriter:", err)
			return
		}
		if mt == websocket.TextMessage {
			r = &validator{r: r}
		}
		if writerOnly {
			_, err = io.Copy(struct{ io.Writer }{w}, r)
		} else {
			_, err = io.Copy(w, r)
		}
		if err != nil {
			if err == errInvalidUTF8 {
				conn.WriteControl(websocket.CloseMessage,
					websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
					time.Time{})
			}
			log.Println("Copy:", err)
			return
		}
		err = w.Close()
		if err != nil {
			log.Println("Close:", err)
			return
		}
	}
}
Example #3
0
// echoReadAll echoes messages from the client by reading the entire message
// with ioutil.ReadAll.
func echoReadAll(w http.ResponseWriter, r *http.Request, writeMessage bool) {
	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Upgrade:", err)
		return
	}
	defer conn.Close()
	for {
		mt, b, err := conn.ReadMessage()
		if err != nil {
			if err != io.EOF {
				log.Println("NextReader:", err)
			}
			return
		}
		if mt == websocket.TextMessage {
			if !utf8.Valid(b) {
				conn.WriteControl(websocket.CloseMessage,
					websocket.FormatCloseMessage(websocket.CloseInvalidFramePayloadData, ""),
					time.Time{})
				log.Println("ReadAll: invalid utf8")
			}
		}
		if writeMessage {
			err = conn.WriteMessage(mt, b)
			if err != nil {
				log.Println("WriteMessage:", err)
			}
		} else {
			w, err := conn.NextWriter(mt)
			if err != nil {
				log.Println("NextWriter:", err)
				return
			}
			if _, err := w.Write(b); err != nil {
				log.Println("Writer:", err)
				return
			}
			if err := w.Close(); err != nil {
				log.Println("Close:", err)
				return
			}
		}
	}
}