package hbwebsocketclientbase import ( "fmt" "github.com/gorilla/websocket" "strings" "sync" "time" "wss-pool/internal/gzip" "wss-pool/internal/model" "wss-pool/logging/applogger" ) const ( TimerIntervalSecond = 5 ReconnectWaitSecond = 60 wsPath = "/ws" feedPath = "/feed" MaxMegByte = 100 ) // It will be invoked after websocket connected type ConnectedHandler func() // It will be invoked after valid message received type MessageHandler func(message string) (interface{}, error) // It will be invoked after response is parsed type ResponseHandler func(response interface{}) // The base class that responsible to get data from websocket type WebSocketClientBase struct { host string path string conn *websocket.Conn connectedHandler ConnectedHandler messageHandler MessageHandler responseHandler ResponseHandler stopReadChannel chan int stopTickerChannel chan int ticker *time.Ticker lastReceivedTime time.Time sendMutex *sync.Mutex Symbol string } // Initializer func (p *WebSocketClientBase) Init(host string) *WebSocketClientBase { p.host = host p.path = wsPath p.stopReadChannel = make(chan int, 1) p.stopTickerChannel = make(chan int, 1) p.sendMutex = &sync.Mutex{} return p } // Initializer with path func (p *WebSocketClientBase) InitWithFeedPath(host string) *WebSocketClientBase { p.Init(host) p.path = feedPath return p } // Set callback handler func (p *WebSocketClientBase) SetHandler(connHandler ConnectedHandler, msgHandler MessageHandler, repHandler ResponseHandler) { p.connectedHandler = connHandler 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 *WebSocketClientBase) 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 *WebSocketClientBase) 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 *WebSocketClientBase) Close() { p.stopTicker() p.disconnectWebSocket() } // connect to websocketserver func (p *WebSocketClientBase) connectWebSocket() { var err error url := fmt.Sprintf("wss://%s%s", p.host, p.path) applogger.Debug("WebSocket connecting...", url) 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() if p.connectedHandler != nil { p.connectedHandler() } } // disconnect with websocketserver func (p *WebSocketClientBase) 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 *WebSocketClientBase) startTicker() { p.ticker = time.NewTicker(TimerIntervalSecond * time.Second) go p.tickerLoop() } // stop ticker and stop the goroutine func (p *WebSocketClientBase) 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 *WebSocketClientBase) tickerLoop() { applogger.Debug("tickerLoop started") for { select { // Receive data from stopChannel 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 *WebSocketClientBase) startReadLoop() { go p.readLoop() } // stop the goroutine readLoop() func (p *WebSocketClientBase) stopReadLoop() { p.stopReadChannel <- 1 } func (p *WebSocketClientBase) contractDepth(buf []byte) { applogger.Info("message big lai", len(buf)) _, err := p.messageHandler(string(buf)) if err != nil { applogger.Error("Handle message error: %s", err) return } if p.responseHandler != nil { p.responseHandler(buf) } } // defines a for loop to read data from websocketserver // it will stop once it receives the signal from stopReadChannel func (p *WebSocketClientBase) 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 if msgType == websocket.BinaryMessage { //只有合约深度不解压 fmt.Println("websocket :", p.Symbol) if len(buf) >= MaxMegByte && strings.Contains(p.Symbol, "USDT.depth.step") { // If it contains expected string, then invoke message handler and response handler p.contractDepth(buf) continue } // TODO: 注释GZipDecompress message, err := gzip.GZipDecompress(buf) if err != nil { applogger.Error("UnGZip data error: %s", err) return } // applogger.Info(string(buf)) //Try to pass as PingMessage pingMsg := model.ParsePingMessage(message) // If it is Ping then respond Pong if pingMsg != nil && pingMsg.Ping != 0 { applogger.Debug("Received Ping: %d", pingMsg.Ping) pongMsg := fmt.Sprintf("{\"pong\": %d}", pingMsg.Ping) p.Send(pongMsg) applogger.Debug("Replied Pong: %d", pingMsg.Ping) } else if strings.Contains(message, "tick") || strings.Contains(message, "data") { // If it contains expected string, then invoke message handler and response handler //可能少量数据 低于 MaxMegByte if strings.Contains(p.Symbol, "USDT.depth.step") { p.contractDepth(buf) continue } result, err := p.messageHandler(message) if err != nil { applogger.Error("Handle message error: %s", err) continue } if p.responseHandler != nil { p.responseHandler(result) } } } } } }