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Dead sockets with socket.connected == true but conn.readyState == 'closed'

See original GitHub issue

Using websocket only transport (no upgrades), in my production server I often get sockets that are dead but still appear connected. After some digging, it seems that the underlying engine.io socket is disconnected:

socket.client.conn.readyState == 'closed'

but the socket itself is still connected:

socket.connected == true

It’s also interesting that socket.client.sockets is empty. Unfortunately I cannot reproduce it on my dev machine, but it happens very regularly in our production.

Full trace of the socket object:

Socket {
  id: '/#1Hg6XhYhHIScj3-xAAAU',
  client: 
   Client {
     server: 
      Server {
        nsps: [Object],
        _path: '/socket.io',
        _serveClient: true,
        _adapter: [Function: Adapter],
        _origins: '*:*',
        sockets: {},
        eio: [Object],
        httpServer: [Object],
        engine: [Object] },
     conn: 
      Socket {
        id: '1Hg6XhYhHIScj3-xAAAU',
        server: [Object],
        upgrading: false,
        upgraded: false,
        readyState: 'closed',
        writeBuffer: [],
        packetsFn: [],
        sentCallbackFn: [],
        cleanupFn: [],
        request: [Object],
        remoteAddress: undefined,
        checkIntervalTimer: null,
        upgradeTimeoutTimer: null,
        pingTimeoutTimer: [Object],
        transport: [Object],
        _events: {},
        _eventsCount: 0 },
     encoder: Encoder {},
     decoder: Decoder { reconstructor: null, _callbacks: [Object] },
     id: '1Hg6XhYhHIScj3-xAAAU',
     request: 
      IncomingMessage {
        _readableState: [Object],
        readable: true,
        domain: null,
        _events: {},
        _eventsCount: 0,
        _maxListeners: undefined,
        socket: [Object],
        connection: [Object],
        httpVersionMajor: 1,
        httpVersionMinor: 1,
        httpVersion: '1.1',
        complete: true,
        headers: [Object],
        rawHeaders: [Object],
        trailers: {},
        rawTrailers: [],
        upgrade: true,
        url: '/socket.io/?EIO=3&transport=websocket',
        method: 'GET',
        statusCode: null,
        statusMessage: null,
        client: [Object],
        _consuming: false,
        _dumped: false,
        parser: null,
        _query: [Object],
        websocket: [Object] },
     onclose: [Function: bound ],
     ondata: [Function: bound ],
     onerror: [Function: bound ],
     ondecoded: [Function: bound ],
     sockets: {},
     nsps: {},
     connectBuffer: [] },
  conn: 
   Socket {
     id: '1Hg6XhYhHIScj3-xAAAU',
     server: 
      Server {
        clients: [Object],
        clientsCount: 62,
        pingTimeout: 60000,
        pingInterval: 25000,
        upgradeTimeout: 10000,
        maxHttpBufferSize: 100000000,
        transports: [Object],
        allowUpgrades: true,
        allowRequest: [Function: bound ],
        cookie: 'io',
        cookiePath: false,
        perMessageDeflate: [Object],
        httpCompression: [Object],
        ws: [Object],
        _events: [Object],
        _eventsCount: 1 },
     upgrading: false,
     upgraded: false,
     readyState: 'closed',
     writeBuffer: [],
     packetsFn: [],
     sentCallbackFn: [],
     cleanupFn: [],
     request: 
      IncomingMessage {
        _readableState: [Object],
        readable: true,
        domain: null,
        _events: {},
        _eventsCount: 0,
        _maxListeners: undefined,
        socket: [Object],
        connection: [Object],
        httpVersionMajor: 1,
        httpVersionMinor: 1,
        httpVersion: '1.1',
        complete: true,
        headers: [Object],
        rawHeaders: [Object],
        trailers: {},
        rawTrailers: [],
        upgrade: true,
        url: '/socket.io/?EIO=3&transport=websocket',
        method: 'GET',
        statusCode: null,
        statusMessage: null,
        client: [Object],
        _consuming: false,
        _dumped: false,
        parser: null,
        _query: [Object],
        websocket: [Object] },
     remoteAddress: undefined,
     checkIntervalTimer: null,
     upgradeTimeoutTimer: null,
     pingTimeoutTimer: 
      { '0': null,
        _called: false,
        _idleTimeout: -1,
        _idlePrev: null,
        _idleNext: null,
        _idleStart: 3260,
        _onTimeout: null,
        _repeat: null },
     transport: 
      WebSocket {
        readyState: 'closed',
        discarded: false,
        socket: [Object],
        writable: true,
        perMessageDeflate: [Object],
        supportsBinary: true,
        _events: [Object],
        _eventsCount: 2,
        sid: '1Hg6XhYhHIScj3-xAAAU',
        req: [Object] },
     _events: {},
     _eventsCount: 0 },
  rooms: {},
  acks: { '0': [Function: bound _return] },
  connected: true,
  disconnected: false,
  handshake: { ... },
  _events: 
   { call: [Function: bound _socketCall],
     disconnect: [ [Object], [Object] ],
     so_register: [Function: bound _socketRegister],
     so_unregister: [Function: bound _socketUnregister] },
  _eventsCount: 4,
  nsp: 
   Namespace {
     name: '/',
     server: 
      Server {
        nsps: [Object],
        _path: '/socket.io',
        _serveClient: true,
        _adapter: [Function: Adapter],
        _origins: '*:*',
        sockets: [Circular],
        eio: [Object],
        httpServer: [Object],
        engine: [Object] },
     sockets: 
      { '/#mpXFdRLqNAV9ddV8ABo3': [Object],
        '/#PgpLl9IEkhGC8wquABrj': [Object],
        '/#Gtg7RgFkVxWIR0G-ACFC': [Object],
        '/#ittz_2-t6cHjQwHtACFX': [Object],
        '/#N15RCOXAc41mXsJLACIv': [Object],
        '/#e63gVURVyWwYuKChACJD': [Object],
        '/#zPomBTSI7oHu3rZvACJZ': [Object],
        '/#sTKGIUCMfvUWgHgYACJ4': [Object],
        '/#xngDiBXaPz3CyfbtACKB': [Object],
        '/#AlNGTODK5VKj09-xACKD': [Object],
        '/#0QRGe5tkHPIniRBoACLO': [Object],
        '/#2z1xOZoKWwKeNDWIACLm': [Object],
        '/#UWxktnMDPRXs4DhBACMJ': [Object],
        '/#xtHO7ZsR-nci8o5UACM2': [Object],
        '/#5UFHi8aa5b3FvN-uACM7': [Object],
        '/#abJSNk2XWIEpyFVeACM_': [Object],
        '/#jQSSTvXsUibvlQIdACNJ': [Object],
        '/#169Og85oGVYMdAyVACNN': [Object],
        '/#hz7FpP60SyUheD9cACNu': [Object],
        '/#LNwxMo_J9wQIX2iBACN0': [Object],
        '/#BdcqSS7RV25Tf4HOACOT': [Object],
        '/#zdC-LNqIosP53HJLACOk': [Object],
        '/#A9lwOkH3K1rEgmpsACOu': [Object],
        '/#y8v2mg7y9kb9ycMGACOv': [Object],
        '/#ai8CLwH8OLrWJpT2ACOw': [Object],
        '/#CFqZN1PfXorK5TmYACO3': [Object],
        '/#IKtfHdLnQapecYkKACPD': [Object],
        '/#TJ_XK-WsZpnuYLW6ACPX': [Object],
        '/#VdCv3ugKE_AXY7y_ACPa': [Object],
        '/#afU-22Kru62eB-ExACPc': [Object],
        '/#pmT3Ul9nOEThe4dYACPd': [Object],
        '/#7zcvOThOc3q3t2_jACPk': [Object],
        '/#PeaR3IFjWr2OZw7RACPm': [Object],
        '/#sDs1_lrwWw9kM7f8ACPp': [Object],
        '/#1w40F0qSwfSI8MTcACPs': [Object],
        '/#wtXLcq8Xjzd9O1QoACQH': [Object],
        '/#C_JP4PxqWxJyiNjCACQQ': [Object],
        '/#LCebqRf6_1Mxl1TYACQS': [Object],
        '/#QpIa716sqKKQBhoRACQU': [Object],
        '/#gOhtDjTOnDZYH6u4ACQW': [Object],
        '/#BGqCqXmaj3Lfx_M5ACQb': [Object],
        '/#x51Jjk4Sag-0rcNbACQc': [Object],
        '/#T5Plt9fPQz7ioG-MACQf': [Object],
        '/#0fMw16m2vvFAUODaACQg': [Object],
        '/#xKBqzpxIQxV1EKaqACQj': [Object],
        '/#KN1y8qDEyQhQyDKYACQl': [Object],
        '/#dQEeP_3lvfyQJnvXACQm': [Object],
        '/#nKI07ZGLUA4N0Mv7ACQp': [Object],
        '/#MyuFcxLfFL5MLfZMACQr': [Object],
        '/#TYCVuF-SR29fQqnbACQy': [Object],
        '/#lQoZ5voA3Wl6W-qYACQ2': [Object],
        '/#KsI2yQbvLYzf7iBYACQ3': [Object],
        '/#tv1k7HrmVCK218muACQ-': [Object],
        '/#UA1SIcCFggR4D5fwACRA': [Object],
        '/#IGm5hdpvorgKl47jACRC': [Object],
        '/#shiT7knJwgNtiQoUACRD': [Object],
        '/#rcsf_x_qZYwzLFCTACRG': [Object],
        '/#mEVeZ-RDFJvrbt7CACRH': [Object],
        '/#eI3g-e0JDMj74DAjACRL': [Object],
        '/#ViYa_AJ56TSNMr4fACRN': [Object],
        '/#CjVXD0KsMAn1M-3zACRQ': [Object],
        '/#4zb-IVPfYsq6_FjwACRV': [Object] },
     connected: 
      { '/#mpXFdRLqNAV9ddV8ABo3': [Object],
        '/#PgpLl9IEkhGC8wquABrj': [Object],
        '/#Gtg7RgFkVxWIR0G-ACFC': [Object],
        '/#ittz_2-t6cHjQwHtACFX': [Object],
        '/#N15RCOXAc41mXsJLACIv': [Object],
        '/#e63gVURVyWwYuKChACJD': [Object],
        '/#zPomBTSI7oHu3rZvACJZ': [Object],
        '/#sTKGIUCMfvUWgHgYACJ4': [Object],
        '/#xngDiBXaPz3CyfbtACKB': [Object],
        '/#AlNGTODK5VKj09-xACKD': [Object],
        '/#0QRGe5tkHPIniRBoACLO': [Object],
        '/#2z1xOZoKWwKeNDWIACLm': [Object],
        '/#UWxktnMDPRXs4DhBACMJ': [Object],
        '/#xtHO7ZsR-nci8o5UACM2': [Object],
        '/#5UFHi8aa5b3FvN-uACM7': [Object],
        '/#abJSNk2XWIEpyFVeACM_': [Object],
        '/#jQSSTvXsUibvlQIdACNJ': [Object],
        '/#169Og85oGVYMdAyVACNN': [Object],
        '/#hz7FpP60SyUheD9cACNu': [Object],
        '/#LNwxMo_J9wQIX2iBACN0': [Object],
        '/#BdcqSS7RV25Tf4HOACOT': [Object],
        '/#zdC-LNqIosP53HJLACOk': [Object],
        '/#A9lwOkH3K1rEgmpsACOu': [Object],
        '/#y8v2mg7y9kb9ycMGACOv': [Object],
        '/#ai8CLwH8OLrWJpT2ACOw': [Object],
        '/#CFqZN1PfXorK5TmYACO3': [Object],
        '/#IKtfHdLnQapecYkKACPD': [Object],
        '/#TJ_XK-WsZpnuYLW6ACPX': [Object],
        '/#VdCv3ugKE_AXY7y_ACPa': [Object],
        '/#afU-22Kru62eB-ExACPc': [Object],
        '/#pmT3Ul9nOEThe4dYACPd': [Object],
        '/#7zcvOThOc3q3t2_jACPk': [Object],
        '/#PeaR3IFjWr2OZw7RACPm': [Object],
        '/#sDs1_lrwWw9kM7f8ACPp': [Object],
        '/#1w40F0qSwfSI8MTcACPs': [Object],
        '/#wtXLcq8Xjzd9O1QoACQH': [Object],
        '/#C_JP4PxqWxJyiNjCACQQ': [Object],
        '/#LCebqRf6_1Mxl1TYACQS': [Object],
        '/#QpIa716sqKKQBhoRACQU': [Object],
        '/#gOhtDjTOnDZYH6u4ACQW': [Object],
        '/#BGqCqXmaj3Lfx_M5ACQb': [Object],
        '/#x51Jjk4Sag-0rcNbACQc': [Object],
        '/#T5Plt9fPQz7ioG-MACQf': [Object],
        '/#0fMw16m2vvFAUODaACQg': [Object],
        '/#xKBqzpxIQxV1EKaqACQj': [Object],
        '/#KN1y8qDEyQhQyDKYACQl': [Object],
        '/#dQEeP_3lvfyQJnvXACQm': [Object],
        '/#nKI07ZGLUA4N0Mv7ACQp': [Object],
        '/#MyuFcxLfFL5MLfZMACQr': [Object],
        '/#TYCVuF-SR29fQqnbACQy': [Object],
        '/#lQoZ5voA3Wl6W-qYACQ2': [Object],
        '/#KsI2yQbvLYzf7iBYACQ3': [Object],
        '/#tv1k7HrmVCK218muACQ-': [Object],
        '/#UA1SIcCFggR4D5fwACRA': [Object],
        '/#IGm5hdpvorgKl47jACRC': [Object],
        '/#shiT7knJwgNtiQoUACRD': [Object],
        '/#rcsf_x_qZYwzLFCTACRG': [Object],
        '/#mEVeZ-RDFJvrbt7CACRH': [Object],
        '/#eI3g-e0JDMj74DAjACRL': [Object],
        '/#ViYa_AJ56TSNMr4fACRN': [Object],
        '/#CjVXD0KsMAn1M-3zACRQ': [Object],
        '/#4zb-IVPfYsq6_FjwACRV': [Object] },
     fns: [ [Function: bound connected] ],
     ids: 263,
     adapter: 
      Adapter {
        nsp: [Circular],
        rooms: [Object],
        sids: [Object],
        encoder: Encoder {} } },
  server: 
   Server {
     nsps: { '/': [Object] },
     _path: '/socket.io',
     _serveClient: true,
     _adapter: [Function: Adapter],
     _origins: '*:*',
     sockets: 
      Namespace {
        name: '/',
        server: [Circular],
        sockets: [Object],
        connected: [Object],
        fns: [Object],
        ids: 263,
        adapter: [Object] },
     eio: 
      Server {
        clients: [Object],
        clientsCount: 62,
        pingTimeout: 60000,
        pingInterval: 25000,
        upgradeTimeout: 10000,
        maxHttpBufferSize: 100000000,
        transports: [Object],
        allowUpgrades: true,
        allowRequest: [Function: bound ],
        cookie: 'io',
        cookiePath: false,
        perMessageDeflate: [Object],
        httpCompression: [Object],
        ws: [Object],
        _events: [Object],
        _eventsCount: 1 },
     httpServer: 
      Server {
        domain: null,
        _events: [Object],
        _eventsCount: 5,
        _maxListeners: undefined,
        _connections: 78,
        _handle: [Object],
        _usingSlaves: false,
        _slaves: [],
        _unref: false,
        allowHalfOpen: true,
        pauseOnConnect: false,
        httpAllowHalfOpen: false,
        timeout: 120000,
        _pendingResponseData: 0,
        _pipeName: '/tmp/lazytime-2947.sock',
        _connectionKey: '-1:/tmp/lazytime-2947.sock:-1' },
     engine: 
      Server {
        clients: [Object],
        clientsCount: 62,
        pingTimeout: 60000,
        pingInterval: 25000,
        upgradeTimeout: 10000,
        maxHttpBufferSize: 100000000,
        transports: [Object],
        allowUpgrades: true,
        allowRequest: [Function: bound ],
        cookie: 'io',
        cookiePath: false,
        perMessageDeflate: [Object],
        httpCompression: [Object],
        ws: [Object],
        _events: [Object],
        _eventsCount: 1 } },
  adapter: 
   Adapter {
     nsp: 
      Namespace {
        name: '/',
        server: [Object],
        sockets: [Object],
        connected: [Object],
        fns: [Object],
        ids: 263,
        adapter: [Circular] },
     rooms: 
      { '/#mpXFdRLqNAV9ddV8ABo3': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_637_322332849': [Object],
        '/#PgpLl9IEkhGC8wquABrj': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_682_814013352': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_775_367324151': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_792_754277181': [Object],
        '/#Gtg7RgFkVxWIR0G-ACFC': [Object],
        '/#ittz_2-t6cHjQwHtACFX': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_805_960091403': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_807_815936249': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_811_822210855': [Object],
        '/#N15RCOXAc41mXsJLACIv': [Object],
        '/#e63gVURVyWwYuKChACJD': [Object],
        '/#zPomBTSI7oHu3rZvACJZ': [Object],
        '/#sTKGIUCMfvUWgHgYACJ4': [Object],
        '/#xngDiBXaPz3CyfbtACKB': [Object],
        '/#AlNGTODK5VKj09-xACKD': [Object],
        '/#0QRGe5tkHPIniRBoACLO': [Object],
        '/#2z1xOZoKWwKeNDWIACLm': [Object],
        '/#UWxktnMDPRXs4DhBACMJ': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_841_567736259': [Object],
        '/#xtHO7ZsR-nci8o5UACM2': [Object],
        '/#5UFHi8aa5b3FvN-uACM7': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_781_131630785': [Object],
        '/#abJSNk2XWIEpyFVeACM_': [Object],
        '/#jQSSTvXsUibvlQIdACNJ': [Object],
        '/#169Og85oGVYMdAyVACNN': [Object],
        '/#hz7FpP60SyUheD9cACNu': [Object],
        '/#LNwxMo_J9wQIX2iBACN0': [Object],
        '/#BdcqSS7RV25Tf4HOACOT': [Object],
        '/#zdC-LNqIosP53HJLACOk': [Object],
        '/#A9lwOkH3K1rEgmpsACOu': [Object],
        '/#y8v2mg7y9kb9ycMGACOv': [Object],
        '/#ai8CLwH8OLrWJpT2ACOw': [Object],
        '/#CFqZN1PfXorK5TmYACO3': [Object],
        '/#IKtfHdLnQapecYkKACPD': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_857_947771824': [Object],
        '/#TJ_XK-WsZpnuYLW6ACPX': [Object],
        '/#VdCv3ugKE_AXY7y_ACPa': [Object],
        '/#afU-22Kru62eB-ExACPc': [Object],
        '/#pmT3Ul9nOEThe4dYACPd': [Object],
        '/#7zcvOThOc3q3t2_jACPk': [Object],
        '/#PeaR3IFjWr2OZw7RACPm': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_859_942849326': [Object],
        '/#sDs1_lrwWw9kM7f8ACPp': [Object],
        '/#1w40F0qSwfSI8MTcACPs': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_609_773513602': [Object],
        '/#wtXLcq8Xjzd9O1QoACQH': [Object],
        '/#C_JP4PxqWxJyiNjCACQQ': [Object],
        '/#LCebqRf6_1Mxl1TYACQS': [Object],
        '/#QpIa716sqKKQBhoRACQU': [Object],
        '/#gOhtDjTOnDZYH6u4ACQW': [Object],
        '/#BGqCqXmaj3Lfx_M5ACQb': [Object],
        '/#x51Jjk4Sag-0rcNbACQc': [Object],
        '/#T5Plt9fPQz7ioG-MACQf': [Object],
        '/#0fMw16m2vvFAUODaACQg': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_866_981833503': [Object],
        '/#xKBqzpxIQxV1EKaqACQj': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_867_56605879': [Object],
        '/#KN1y8qDEyQhQyDKYACQl': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_868_813744036': [Object],
        '/#dQEeP_3lvfyQJnvXACQm': [Object],
        '/#nKI07ZGLUA4N0Mv7ACQp': [Object],
        '/#MyuFcxLfFL5MLfZMACQr': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_869_297647636': [Object],
        '/#TYCVuF-SR29fQqnbACQy': [Object],
        '/#lQoZ5voA3Wl6W-qYACQ2': [Object],
        '/#KsI2yQbvLYzf7iBYACQ3': [Object],
        '/#tv1k7HrmVCK218muACQ-': [Object],
        '/#UA1SIcCFggR4D5fwACRA': [Object],
        '/#IGm5hdpvorgKl47jACRC': [Object],
        '/#shiT7knJwgNtiQoUACRD': [Object],
        '/#rcsf_x_qZYwzLFCTACRG': [Object],
        '/#mEVeZ-RDFJvrbt7CACRH': [Object],
        '/#eI3g-e0JDMj74DAjACRL': [Object],
        '/#ViYa_AJ56TSNMr4fACRN': [Object],
        '/#CjVXD0KsMAn1M-3zACRQ': [Object],
        'zstandalone/roulette/1/2__games/roulette/roulette_871_662515426': [Object],
        '/#4zb-IVPfYsq6_FjwACRV': [Object] },
     sids: 
      { '/#mpXFdRLqNAV9ddV8ABo3': [Object],
        '/#PgpLl9IEkhGC8wquABrj': [Object],
        '/#Gtg7RgFkVxWIR0G-ACFC': [Object],
        '/#ittz_2-t6cHjQwHtACFX': [Object],
        '/#N15RCOXAc41mXsJLACIv': [Object],
        '/#e63gVURVyWwYuKChACJD': [Object],
        '/#zPomBTSI7oHu3rZvACJZ': [Object],
        '/#sTKGIUCMfvUWgHgYACJ4': [Object],
        '/#xngDiBXaPz3CyfbtACKB': [Object],
        '/#AlNGTODK5VKj09-xACKD': [Object],
        '/#0QRGe5tkHPIniRBoACLO': [Object],
        '/#2z1xOZoKWwKeNDWIACLm': [Object],
        '/#UWxktnMDPRXs4DhBACMJ': [Object],
        '/#xtHO7ZsR-nci8o5UACM2': [Object],
        '/#5UFHi8aa5b3FvN-uACM7': [Object],
        '/#abJSNk2XWIEpyFVeACM_': [Object],
        '/#jQSSTvXsUibvlQIdACNJ': [Object],
        '/#169Og85oGVYMdAyVACNN': [Object],
        '/#hz7FpP60SyUheD9cACNu': [Object],
        '/#LNwxMo_J9wQIX2iBACN0': [Object],
        '/#BdcqSS7RV25Tf4HOACOT': [Object],
        '/#zdC-LNqIosP53HJLACOk': [Object],
        '/#A9lwOkH3K1rEgmpsACOu': [Object],
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     encoder: Encoder {} },
}

Issue Analytics

  • State:closed
  • Created 7 years ago
  • Reactions:2
  • Comments:13 (1 by maintainers)

github_iconTop GitHub Comments

2reactions
Alan01252commented, Oct 27, 2016

I think we’re experiencing the same problem, did you get any further with this? @stwiname were you able to reproduce?

0reactions
darrachequesnecommented, Feb 18, 2021

Closed due to inactivity, please reopen if needed.

Read more comments on GitHub >

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