Golang Conn.WriteJSON方法代碼示例

func handleChangeNotification(socket *websocket.Conn, userID string, err chan string) {
	res, errr := r.Table("notifications").
		Filter(r.Row.Field("UserId").
			Eq(userID)).
		Changes().
		Run(api.Sess)

	var value HandleChange
	if errr != nil {
		err <- errr.Error()
	}
	for res.Next(&value) {
		var notif api.Notification
		var simpleNotif api.WebSocketNotification

		mapstructure.Decode(value.NewVal, &notif)
		if notif.Id == "" {
			mapstructure.Decode(value.OldVal, &notif)
			simpleNotif.OldVal = true
		} else {
			simpleNotif.OldVal = false
		}
		simpleNotif.Title = "notification"
		simpleNotif.Type = notif.Type
		simpleNotif.Name = notif.Name
		simpleNotif.UserIdFrom = notif.UserIdFrom
		simpleNotif.IdLink = notif.IdLink
		simpleNotif.CreatedAt = notif.CreatedAt
		errr := socket.WriteJSON(simpleNotif)
		if errr != nil {
			err <- errr.Error()
		}
	}
}

func streamResults(sock *websocket.Conn, params searchParams, limit int) {
	start := time.Now()
	count := 0
	results := make(chan searchResult)
	control := make(chan struct{}, 1)

	go find(results, control, params)
	for {
		res, ok := <-results
		if !ok {
			log.Printf("Finished request in %v\n", time.Since(start))
			return
		}

		count++
		log.Printf("Found result #%v after %v\n", count, time.Since(start))

		err := sock.WriteJSON(res)
		if err != nil {
			log.Printf("Error while writing result: %v\n", err)
			control <- struct{}{}
			return
		}

		if count >= limit {
			log.Printf("Finished request after hitting limit in %v\n", time.Since(start))
			control <- struct{}{}
			return
		}
	}
}

func subChannelEvent(c *websocket.Conn, channel string) {
	subChan := subChannel{Event: "addChannel", Channel: channel}
	err := c.WriteJSON(subChan)
	if err != nil {
		log.Printf("sub channel %s err :%s", channel, err)
	}
}

// writer runs in a goroutine for each connected WS client. It emits all message returned by the observer.
func writer(ws *websocket.Conn, a *ApiHandlers) {
	pingTicker := time.NewTicker(pingPeriod)
	s := a.getDBSubscriber()
	jww.INFO.Println("Opened WebSocket connection.")
	defer func(is *subscriber) {
		jww.INFO.Println("Closing WebSocket connection.")
		is.quitChan <- true
		pingTicker.Stop()
		ws.Close()
	}(s)

	for {
		select {
		case msg := <-s.bufChan:
			ws.SetWriteDeadline(time.Now().Add(writeWait))
			if err := ws.WriteJSON(msg); err != nil {
				return
			}
		case <-pingTicker.C:
			ws.SetWriteDeadline(time.Now().Add(writeWait))
			if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
				return
			}
		}
	}
}

func messagePing(ws *websocket.Conn, vault *client) MessageHandler {
	return func(data map[string]interface{}) error {
		return ws.WriteJSON(&messagePingResponse{
			Pong: true,
		})
	}
}

func streamStatus(sock *websocket.Conn) {
	installed := installedPacks()
	filteredInstalled := []shared.Pack{}
	available := availablePacks()

loopinstalled:
	for _, ip := range installed {
		for ai, ap := range available {
			if ip.Installing && ip.File == ap.File {
				available[ai].Installing = true
				continue loopinstalled
			}
		}
		filteredInstalled = append(filteredInstalled, ip)
	}

	info := StatusInfo{
		Packs: PackInfo{
			Installed: filteredInstalled,
			Available: available,
		},
		Version: global.buildVersion,
	}

	err := sock.WriteJSON(controlResponse{Typ: "StatusResponse", Data: info})
	if err != nil {
		log.Printf("Error while writing status info: %v\n", err)
		return
	}
}

func clientGetRequest(wsConn *websocket.Conn, action string) {

	messageMap := make(map[string]interface{})
	messageMap["action"] = action

	wsConn.WriteJSON(messageMap)
}

func clientDiffRequest(wsConn *websocket.Conn, session *mgo.Session) {

	// init client_diff_request
	response_map := make(map[string]interface{})
	response_map["action"] = "client_diff_request"

	// find syncable object uuids
	cb := session.DB("landline").C("SyncableObjects")
	var m_result []map[string]interface{}
	err := cb.Find(bson.M{}).All(&m_result)
	if err != nil {
		log.Println(err)
	} else {

		// objects that the clients knows, but the server may not
		object_uuids := make(map[string]interface{})

		// loop results
		for u, result := range m_result {
			_ = u
			object_uuids[result["uuid"].(string)] = result["time_modified_since_creation"]
		}
		response_map["object_uuids"] = object_uuids

		// send it over websocket
		wsConn.WriteJSON(response_map)

		log.Println("Wrote message:")
		jsonString, _ := json.Marshal(response_map)
		log.Println(string(jsonString))
	}
}

func commandUnsubscribeFromTreeState(conn *websocket.Conn, id string, message map[string]interface{}) {
	name, ok := stringProp(message, "name")
	if !ok {
		sendErrorMessage(conn, "No \"name\" property specified or not a string in UNSUBSCRIBE_FROM_TREE_STATE message")
		return
	}

	globalLock.Lock()
	defer globalLock.Unlock()

	_, ok = broadcasts[name]
	if !ok {
		sendErrorMessage(conn, fmt.Sprintf("Unknown broadcast: %v", name))
		return
	}

	listeners, ok := treeStateListeners[name]
	if !ok {
		return
	}

	delete(*listeners, id)

	conn.WriteJSON(struct {
		Command string `json:"command"`
	}{
		"UNSUBSCRIBE_FROM_TREE_STATE_RECEIVED",
	})
}

func sendErrorMessage(conn *websocket.Conn, message string) {
	log.Println(message)
	conn.WriteJSON(struct {
		Command string `json:"command"`
		Message string `json:"message"`
	}{"ERROR", message})
}

func commandSubscribeToTreeState(conn *websocket.Conn, id string, message map[string]interface{}) {
	name, ok := stringProp(message, "name")
	if !ok {
		sendErrorMessage(conn, "No \"name\" property specified or not a string in SUBSCRIBE_TO_TREE_STATE message")
		return
	}

	globalLock.Lock()
	defer globalLock.Unlock()

	_, ok = broadcasts[name]
	if !ok {
		sendErrorMessage(conn, fmt.Sprintf("Unknown broadcast: %v", name))
		return
	}

	listeners, ok := treeStateListeners[name]
	if !ok {
		listeners = &map[string]*websocket.Conn{}
		treeStateListeners[name] = listeners
	}

	(*listeners)[id] = conn
	conn.WriteJSON(struct {
		Command string `json:"command"`
	}{
		"SUBSCRIBE_TO_TREE_STATE_RECEIVED",
	})

	notifyTreeListeners(name)
}

func commandEndBroadcast(conn *websocket.Conn, id string, message map[string]interface{}) {
	name, ok := stringProp(message, "name")
	if !ok {
		sendErrorMessage(conn, "No \"name\" property specified or not a string in END_BROADCAST message")
		return
	}

	globalLock.Lock()
	defer globalLock.Unlock()

	broadcast, ok := broadcasts[name]
	if !ok {
		sendErrorMessage(conn, fmt.Sprintf("Broadcast \"%v\" does not exist", name))
		return
	}

	if broadcast.id != id {
		sendErrorMessage(conn, fmt.Sprintf("Peer \"%v\" did not start broadcast \"%v\"", id, name))
		return
	}

	endBroadcast(name, broadcast)

	conn.WriteJSON(struct {
		Command string `json:"command"`
		Name    string `json:"name"`
	}{
		"END_BROADCAST_RECEIVED",
		name,
	})
}

func PubSubHandler(conn *websocket.Conn, pubsubClient *redis.PubSub) {
	for {
		msgi, err := pubsubClient.ReceiveMessage()

		if err != nil {
			return
		}

		switch msg := interface{}(msgi).(type) {
		case *redis.Message:
			var json_blob interface{}
			bytes_blob := []byte(msg.Payload)

			if err := json.Unmarshal(bytes_blob, &json_blob); err != nil {
				logger.Printf("[%s][error] failed to parse JSON %v, because %v", conn.RemoteAddr(), msg.Payload, err)
				continue
			}

			if err := conn.WriteJSON(json_blob); err != nil {
				logger.Printf("[%s][error] failed to send JSON, because %v", conn.RemoteAddr(), err)
				conn.Close()
				return
			}

			logger.Printf("[%s][send] OK", conn.RemoteAddr())
		default:
			logger.Printf("[%s][error] Unkown message: %s", conn.RemoteAddr(), msg)
			return
		}
	}
}

// NOTE :: When a guild voice server changes how do we shut this down
// properly, so a new connection can be setup without fuss?
//
// wsHeartbeat sends regular heartbeats to voice Discord so it knows the client
// is still connected.  If you do not send these heartbeats Discord will
// disconnect the websocket connection after a few seconds.
func (v *VoiceConnection) wsHeartbeat(wsConn *websocket.Conn, close <-chan struct{}, i time.Duration) {

	if close == nil || wsConn == nil {
		return
	}

	var err error
	ticker := time.NewTicker(i * time.Millisecond)
	for {
		v.log(LogDebug, "sending heartbeat packet")
		v.wsMutex.Lock()
		err = wsConn.WriteJSON(voiceHeartbeatOp{3, int(time.Now().Unix())})
		v.wsMutex.Unlock()
		if err != nil {
			v.log(LogError, "error sending heartbeat to voice endpoint %s, %s", v.endpoint, err)
			return
		}

		select {
		case <-ticker.C:
			// continue loop and send heartbeat
		case <-close:
			return
		}
	}
}

// heartbeat sends regular heartbeats to Beam so it knows the client
// is still connected.  If you do not send these heartbeats Beam will
// disconnect the websocket connection after a few seconds.
func (s *Session) heartbeat(wsConn *websocket.Conn, listening <-chan interface{}, i time.Duration) {

	if listening == nil || wsConn == nil {
		return
	}

	s.Lock()
	s.DataReady = true
	s.Unlock()

	var err error
	ticker := time.NewTicker(i * time.Millisecond)
	for {
		err = wsConn.WriteJSON(heartbeatOp{1, int(time.Now().Unix())})
		if err != nil {
			fmt.Println("Error sending heartbeat:", err)
			return
		}

		select {
		case <-ticker.C:
			// continue loop and send heartbeat
		case <-listening:
			return
		}
	}
}