binance: update book stream url (decred#3015)

* update binance book stream url

client/comms/wsconn.go

@@ -98,6 +98,7 @@ type WsConn interface {
 	RequestWithTimeout(msg *msgjson.Message, respHandler func(*msgjson.Message), expireTime time.Duration, expire func()) error
 	Connect(ctx context.Context) (*sync.WaitGroup, error)
 	MessageSource() <-chan *msgjson.Message
+	UpdateURL(string)
 }
 
 // When the DEX sends a request to the client, a responseHandler is created
@@ -161,6 +162,7 @@ type wsConn struct {
 	cfg    *WsCfg
 	tlsCfg *tls.Config
 	readCh chan *msgjson.Message
+	urlV   atomic.Value // string
 
 	wsMtx sync.Mutex
 	ws    *websocket.Conn
@@ -203,14 +205,25 @@ func NewWsConn(cfg *WsCfg) (WsConn, error) {
 		ServerName: uri.Hostname(),
 	}
 
-	return &wsConn{
+	conn := &wsConn{
 		cfg:          cfg,
 		log:          cfg.Logger,
 		tlsCfg:       tlsConfig,
 		readCh:       make(chan *msgjson.Message, readBuffSize),
 		respHandlers: make(map[uint64]*responseHandler),
 		reconnectCh:  make(chan struct{}, 1),
-	}, nil
+	}
+	conn.urlV.Store(cfg.URL)
+
+	return conn, nil
+}
+
+func (conn *wsConn) UpdateURL(uri string) {
+	conn.urlV.Store(uri)
+}
+
+func (conn *wsConn) url() string {
+	return conn.urlV.Load().(string)
 }
 
 // IsDown indicates if the connection is known to be down.
@@ -240,7 +253,7 @@ func (conn *wsConn) connect(ctx context.Context) error {
 		dialer.Proxy = http.ProxyFromEnvironment
 	}
 
-	ws, _, err := dialer.DialContext(ctx, conn.cfg.URL, conn.cfg.ConnectHeaders)
+	ws, _, err := dialer.DialContext(ctx, conn.url(), conn.cfg.ConnectHeaders)
 	if err != nil {
 		if isErrorInvalidCert(err) {
 			conn.setConnectionStatus(InvalidCert)
@@ -331,7 +344,7 @@ func (conn *wsConn) handleReadError(err error) {
 
 	var netErr net.Error
 	if errors.As(err, &netErr) && netErr.Timeout() {
-		conn.log.Errorf("Read timeout on connection to %s.", conn.cfg.URL)
+		conn.log.Errorf("Read timeout on connection to %s.", conn.url())
 		reconnect()
 		return
 	}
@@ -457,11 +470,11 @@ func (conn *wsConn) keepAlive(ctx context.Context) {
 				return
 			}
 
-			conn.log.Infof("Attempting to reconnect to %s...", conn.cfg.URL)
+			conn.log.Infof("Attempting to reconnect to %s...", conn.url())
 			err := conn.connect(ctx)
 			if err != nil {
 				conn.log.Errorf("Reconnect failed. Scheduling reconnect to %s in %.1f seconds.",
-					conn.cfg.URL, rcInt.Seconds())
+					conn.url(), rcInt.Seconds())
 				time.AfterFunc(rcInt, func() {
 					conn.reconnectCh <- struct{}{}
 				})

client/core/core_test.go

@@ -347,6 +347,8 @@ func (conn *TWebsocket) Connect(context.Context) (*sync.WaitGroup, error) {
 	return &sync.WaitGroup{}, conn.connectErr
 }
 
+func (conn *TWebsocket) UpdateURL(string) {}
+
 type TDB struct {
 	updateWalletErr          error
 	acct                     *db.AccountInfo

client/mm/libxc/binance.go

@@ -1618,7 +1618,7 @@ func (bnc *binance) getOrderbookSnapshot(ctx context.Context, mktSymbol string)
 // subscribeToAdditionalMarketDataStream is called when a new market is
 // subscribed to after the market data stream connection has already been
 // established.
-func (bnc *binance) subscribeToAdditionalMarketDataStream(ctx context.Context, baseID, quoteID uint32) error {
+func (bnc *binance) subscribeToAdditionalMarketDataStream(ctx context.Context, baseID, quoteID uint32) (err error) {
 	baseCfg, quoteCfg, err := bncAssetCfgs(baseID, quoteID)
 	if err != nil {
 		return fmt.Errorf("error getting asset cfg for %d: %w", baseID, err)
@@ -1627,6 +1627,10 @@ func (bnc *binance) subscribeToAdditionalMarketDataStream(ctx context.Context, b
 	mktID := binanceMktID(baseCfg, quoteCfg)
 	streamID := marketDataStreamID(mktID)
 
+	defer func() {
+		bnc.marketStream.UpdateURL(bnc.streamURL())
+	}()
+
 	bnc.booksMtx.Lock()
 	defer bnc.booksMtx.Unlock()
 
@@ -1662,6 +1666,10 @@ func (bnc *binance) streams() []string {
 	return streamNames
 }
 
+func (bnc *binance) streamURL() string {
+	return fmt.Sprintf("%s/stream?streams=%s", bnc.wsURL, strings.Join(bnc.streams(), "/"))
+}
+
 // checkSubs will query binance for current market subscriptions and compare
 // that to what subscriptions we should have. If there is a discrepancy a
 // warning is logged and the market subbed or unsubbed.
@@ -1756,8 +1764,7 @@ func (bnc *binance) connectToMarketDataStream(ctx context.Context, baseID, quote
 	reconnectC := make(chan struct{})
 	checkSubsC := make(chan struct{})
 
-	newConnection := func() (comms.WsConn, *dex.ConnectionMaster, error) {
-		addr := fmt.Sprintf("%s/stream?streams=%s", bnc.wsURL, strings.Join(bnc.streams(), "/"))
+	newConnection := func() (*dex.ConnectionMaster, error) {
 		// Need to send key but not signature
 		connectEventFunc := func(cs comms.ConnectionStatus) {
 			if cs != comms.Disconnected && cs != comms.Connected {
@@ -1776,7 +1783,7 @@ func (bnc *binance) connectToMarketDataStream(ctx context.Context, baseID, quote
 			}
 		}
 		conn, err := comms.NewWsConn(&comms.WsCfg{
-			URL: addr,
+			URL: bnc.streamURL(),
 			// Binance Docs: The websocket server will send a ping frame every 3
 			// minutes. If the websocket server does not receive a pong frame
 			// back from the connection within a 10 minute period, the connection
@@ -1795,16 +1802,16 @@ func (bnc *binance) connectToMarketDataStream(ctx context.Context, baseID, quote
 			RawHandler:       bnc.handleMarketDataNote,
 		})
 		if err != nil {
-			return nil, nil, err
+			return nil, err
 		}
 
 		bnc.marketStream = conn
 		cm := dex.NewConnectionMaster(conn)
 		if err = cm.ConnectOnce(ctx); err != nil {
-			return nil, nil, fmt.Errorf("websocketHandler remote connect: %v", err)
+			return nil, fmt.Errorf("websocketHandler remote connect: %v", err)
 		}
 
-		return conn, cm, nil
+		return cm, nil
 	}
 
 	// Add the initial book to the books map
@@ -1822,32 +1829,27 @@ func (bnc *binance) connectToMarketDataStream(ctx context.Context, baseID, quote
 	bnc.booksMtx.Unlock()
 
 	// Create initial connection to the market data stream
-	conn, cm, err := newConnection()
+	cm, err := newConnection()
 	if err != nil {
 		return fmt.Errorf("error connecting to market data stream : %v", err)
 	}
 
-	bnc.marketStream = conn
-
 	book.sync(ctx)
 
 	// Start a goroutine to reconnect every 12 hours
 	go func() {
 		reconnect := func() error {
 			bnc.marketStreamMtx.Lock()
 			defer bnc.marketStreamMtx.Unlock()
-
 			oldCm := cm
-			conn, cm, err = newConnection()
+			cm, err = newConnection()
 			if err != nil {
 				return err
 			}
 
 			if oldCm != nil {
 				oldCm.Disconnect()
 			}
-
-			bnc.marketStream = conn
 			return nil
 		}
 
@@ -1922,6 +1924,8 @@ func (bnc *binance) UnsubscribeMarket(baseID, quoteID uint32) (err error) {
 	defer func() {
 		bnc.booksMtx.Unlock()
 
+		conn.UpdateURL(bnc.streamURL())
+
 		if closer != nil {
 			closer.Disconnect()
 		}