Golang Conn.ReadMessage方法代碼示例

func reader(ws *websocket.Conn) {
	defer ws.Close()
	ws.SetReadLimit(512)
	ws.SetReadDeadline(time.Now().Add(pongWait))
	ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add(pongWait)); return nil })
	for {
		_, _, err := ws.ReadMessage()
		if err != nil {
			break
		}
	}
}

// wait for an event; do things that might trigger events, and check them when they are received
// the check function takes an event id and the byte slice read off the ws
func waitForEvent(t *testing.T, con *websocket.Conn, eventid string, dieOnTimeout bool, f func(), check func(string, []byte) error) {
	// go routine to wait for webscoket msg
	goodCh := make(chan []byte)
	errCh := make(chan error)
	quitCh := make(chan struct{})
	defer close(quitCh)

	// Read message
	go func() {
		for {
			_, p, err := con.ReadMessage()
			if err != nil {
				errCh <- err
				break
			} else {
				// if the event id isnt what we're waiting on
				// ignore it
				var response ctypes.Response
				var err error
				wire.ReadJSON(&response, p, &err)
				if err != nil {
					errCh <- err
					break
				}
				event, ok := response.Result.(*ctypes.ResultEvent)
				if ok && event.Event == eventid {
					goodCh <- p
					break
				}
			}
		}
	}()

	// do stuff (transactions)
	f()

	// wait for an event or timeout
	timeout := time.NewTimer(10 * time.Second)
	select {
	case <-timeout.C:
		if dieOnTimeout {
			con.Close()
			t.Fatalf("%s event was not received in time", eventid)
		}
		// else that's great, we didn't hear the event
		// and we shouldn't have
	case p := <-goodCh:
		if dieOnTimeout {
			// message was received and expected
			// run the check
			err := check(eventid, p)
			if err != nil {
				t.Fatal(err)
				panic(err) // Show the stack trace.
			}
		} else {
			con.Close()
			t.Fatalf("%s event was not expected", eventid)
		}
	case err := <-errCh:
		t.Fatal(err)
		panic(err) // Show the stack trace.
	}
}