package hbwebsocketclientbase import ( "fmt" "github.com/gorilla/websocket" "sync" "time" "wss-pool/internal/gzip" "wss-pool/internal/model" "wss-pool/internal/requestbuilder" "wss-pool/logging/applogger" "wss-pool/pkg/model/auth" "wss-pool/pkg/model/base" ) const ( websocketV2Path = "/ws/v2" ) // It will be invoked after websocket v2 authentication response received type AuthenticationV2ResponseHandler func(resp *auth.WebSocketV2AuthenticationResponse) // The base class that responsible to get data from websocket authentication v2 type WebSocketV2ClientBase struct { host string conn *websocket.Conn authenticationResponseHandler AuthenticationV2ResponseHandler messageHandler MessageHandler responseHandler ResponseHandler stopReadChannel chan int stopTickerChannel chan int ticker *time.Ticker lastReceivedTime time.Time sendMutex *sync.Mutex requestBuilder *requestbuilder.WebSocketV2RequestBuilder } // Initializer func (p *WebSocketV2ClientBase) Init(accessKey string, secretKey string, host string) *WebSocketV2ClientBase { p.host = host p.stopReadChannel = make(chan int, 1) p.stopTickerChannel = make(chan int, 1) p.requestBuilder = new(requestbuilder.WebSocketV2RequestBuilder).Init(accessKey, secretKey, host, websocketV2Path) p.sendMutex = &sync.Mutex{} return p } // Set callback handler func (p *WebSocketV2ClientBase) SetHandler(authHandler AuthenticationV2ResponseHandler, msgHandler MessageHandler, repHandler ResponseHandler) { p.authenticationResponseHandler = authHandler p.messageHandler = msgHandler p.responseHandler = repHandler } // Connect to websocket websocketserver // if autoConnect is true, then the connection can be re-connect if no data received after the pre-defined timeout func (p *WebSocketV2ClientBase) Connect(autoConnect bool) { // initialize last received time as now p.lastReceivedTime = time.Now() // connect to websocket p.connectWebSocket() // start ticker to manage connection if autoConnect { p.startTicker() } } // Send data to websocket websocketserver func (p *WebSocketV2ClientBase) Send(data string) { if p.conn == nil { applogger.Error("WebSocket sent error: no connection available") return } p.sendMutex.Lock() err := p.conn.WriteMessage(websocket.TextMessage, []byte(data)) p.sendMutex.Unlock() if err != nil { applogger.Error("WebSocket sent error: data=%s, error=%s", data, err) } } // Close the connection to websocketserver func (p *WebSocketV2ClientBase) Close() { p.stopTicker() p.disconnectWebSocket() } // connect to websocketserver func (p *WebSocketV2ClientBase) connectWebSocket() { var err error url := fmt.Sprintf("wss://%s%s", p.host, websocketV2Path) applogger.Debug("WebSocket connecting...") p.conn, _, err = websocket.DefaultDialer.Dial(url, nil) if err != nil { applogger.Error("WebSocket connected error: %s", err) return } applogger.Info("WebSocket connected") // start loop to read and handle message p.startReadLoop() // send authentication if connect to websocket successfully auth, err := p.requestBuilder.Build() if err != nil { applogger.Error("Signature generated error: %s", err) return } p.Send(auth) applogger.Info("WebSocket sent authentication") } // disconnect with websocketserver func (p *WebSocketV2ClientBase) disconnectWebSocket() { if p.conn == nil { return } // start a new goroutine to send stop signal go p.stopReadLoop() applogger.Debug("WebSocket disconnecting...") err := p.conn.Close() if err != nil { applogger.Error("WebSocket disconnect error: %s", err) return } applogger.Info("WebSocket disconnected") } // initialize a ticker and start a goroutine tickerLoop() func (p *WebSocketV2ClientBase) startTicker() { p.ticker = time.NewTicker(TimerIntervalSecond * time.Second) go p.tickerLoop() } // stop ticker and stop the goroutine func (p *WebSocketV2ClientBase) stopTicker() { p.ticker.Stop() p.stopTickerChannel <- 1 } // defines a for loop that will run based on ticker's frequency // It checks the last data that received from websocketserver, if it is longer than the threshold, // it will force disconnect websocketserver and connect again. func (p *WebSocketV2ClientBase) tickerLoop() { applogger.Debug("tickerLoop started") for { select { // start a goroutine readLoop() case <-p.stopTickerChannel: applogger.Debug("tickerLoop stopped") return // Receive tick from tickChannel case <-p.ticker.C: elapsedSecond := time.Now().Sub(p.lastReceivedTime).Seconds() applogger.Debug("WebSocket received data %f sec ago", elapsedSecond) if elapsedSecond > ReconnectWaitSecond { applogger.Info("WebSocket reconnect...") p.disconnectWebSocket() p.connectWebSocket() } } } } // start a goroutine readLoop() func (p *WebSocketV2ClientBase) startReadLoop() { go p.readLoop() } // stop the goroutine readLoop() func (p *WebSocketV2ClientBase) stopReadLoop() { p.stopReadChannel <- 1 } // defines a for loop to read data from websocketserver // it will stop once it receives the signal from stopReadChannel func (p *WebSocketV2ClientBase) readLoop() { applogger.Debug("readLoop started") for { select { // Receive data from stopChannel case <-p.stopReadChannel: applogger.Debug("readLoop stopped") return default: if p.conn == nil { applogger.Error("Read error: no connection available") time.Sleep(TimerIntervalSecond * time.Second) continue } msgType, buf, err := p.conn.ReadMessage() if err != nil { applogger.Error("Read error: %s", err) time.Sleep(TimerIntervalSecond * time.Second) continue } p.lastReceivedTime = time.Now() // decompress gzip data if it is binary message var message string if msgType == websocket.BinaryMessage { message, err = gzip.GZipDecompress(buf) if err != nil { applogger.Error("UnGZip data error: %s", err) return } } else if msgType == websocket.TextMessage { message = string(buf) } // Try to pass as PingV2Message // If it is Ping then respond Pong pingV2Msg := model.ParsePingV2Message(message) if pingV2Msg.IsPing() { applogger.Debug("Received Ping: %d", pingV2Msg.Data.Timestamp) pongMsg := fmt.Sprintf("{\"action\": \"pong\", \"data\": { \"ts\": %d } }", pingV2Msg.Data.Timestamp) p.Send(pongMsg) applogger.Debug("Respond Pong: %d", pingV2Msg.Data.Timestamp) } else { // Try to pass as websocket v2 authentication response // If it is then invoke authentication handler wsV2Resp := base.ParseWSV2Resp(message) if wsV2Resp != nil { switch wsV2Resp.Action { case "req": authResp := auth.ParseWSV2AuthResp(message) if authResp != nil && p.authenticationResponseHandler != nil { p.authenticationResponseHandler(authResp) } case "sub", "push": { result, err := p.messageHandler(message) if err != nil { applogger.Error("Handle message error: %s", err) continue } if p.responseHandler != nil { p.responseHandler(result) } } } } } } } }