[discuss-webrtc] setLocalDescription fail.

[lx]

Hi all:
        I learn webrtc by https://codelabs.developers.google.com/codelabs/webrtc-web/#8 .
Chrome version:  66.0.3359.181 

OS : windows 7

When the peer call setLocalDesription, it fail.

##################################################

if (isInitiator) {

  console.log('Creating Data Channel');

  dataChannel = peerConn.createDataChannel('photos');

  onDataChannelCreated(dataChannel);

  console.log('Creating an offer');

  peerConn.createOffer(onLocalSessionCreated, logError);

} else {

  peerConn.ondatachannel = function(event) {

    console.log('ondatachannel:', event.channel);

    dataChannel = event.channel;

    onDataChannelCreated(dataChannel);

  };

}

}

function onLocalSessionCreated(desc) {

  console.log('local session created:', desc);

  peerConn.setLocalDescription(desc, function() {

    console.log('sending local desc:', peerConn.localDescription);

    sendMessage(peerConn.localDescription);

  }, logError);

  

  

  /*

  peerConn.setLocalDescription(desc);

  console.log('sending local desc:', peerConn.localDescription);

  sendMessage(peerConn.localDescription);

  */

}

##################################################

The log is:

##################################################

Creating Data Channel

main.js:247 onDataChannelCreated: RTCDataChannel {send: ƒ, label: "photos", ordered: true, maxRetransmitTime: 65535, maxRetransmits: 65535, …}

main.js:220 Creating an offer

main.js:232 local session created: RTCSessionDescription {type: "offer", sdp: "v=0

↵o=- 7092203944903238858 2 IN IP4 127.0.0.1

↵s…id:data

↵a=sctpmap:5000 webrtc-datachannel 1024

↵"}sdp: "v=0

↵o=- 7092203944903238858 2 IN IP4 127.0.0.1

↵s=-

↵t=0 0

↵a=group:BUNDLE data

↵a=msid-semantic: WMS

↵m=application 9 DTLS/SCTP 5000

↵c=IN IP4 0.0.0.0

↵a=ice-ufrag:uX0b

↵a=ice-pwd:AVmsmzfP7hilo9+k5aA0j73T

↵a=ice-options:trickle

↵a=fingerprint:sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3

↵a=setup:actpass

↵a=mid:data

↵a=sctpmap:5000 webrtc-datachannel 1024

↵"type: "offer"__proto__: RTCSessionDescription

main.js:232 local session created: RTCSessionDescription {type: "offer", sdp: "v=0

↵o=- 3324282072586107475 2 IN IP4 127.0.0.1

↵s…id:data

↵a=sctpmap:5000 webrtc-datachannel 1024

↵"}sdp: "v=0

↵o=- 3324282072586107475 2 IN IP4 127.0.0.1

↵s=-

↵t=0 0

↵a=group:BUNDLE data

↵a=msid-semantic: WMS

↵m=application 9 DTLS/SCTP 5000

↵c=IN IP4 0.0.0.0

↵a=ice-ufrag:LsOc

↵a=ice-pwd:KrFJCKdeA5XppQtilOVGuto3

↵a=ice-options:trickle

↵a=fingerprint:sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE

↵a=setup:actpass

↵a=mid:data

↵a=sctpmap:5000 webrtc-datachannel 1024

↵"type: "offer"__proto__: RTCSessionDescriptionsdp: (...)toJSON: ƒ toJSON()type: (...)constructor: ƒ RTCSessionDescription()Symbol(Symbol.toStringTag): "RTCSessionDescription"get sdp: ƒ ()set sdp: ƒ ()get type: ƒ ()set type: ƒ ()__proto__: Object

main.js:414 OperationError: Failed to set local offer sdp: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3 DOMException: Failed to set local offer sdp: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3

logError @ main.js:414

main.js:414 OperationError: Session error code: ERROR_CONTENT. Session error description: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3. DOMException: Session error code: ERROR_CONTENT. Session error description: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3.

logError @ main.js:414

##################################################

How to debug it? This is bug about Chrome?

Thank you.

[Harald Alvestrand]

Look at these two lines:

↵a=fingerprint:sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3

main.js:414 OperationError: Failed to set local offer sdp: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3 DOMException: Failed to set local offer sdp: Failed to push down transport description for data: Local fingerprint does not match identity. Expected: sha-256 CB:4E:B5:25:34:E5:3B:22:71:15:0B:53:43:BF:22:A8:67:51:79:A0:B4:DD:5F:F8:46:1B:9C:95:46:54:E2:EE Got: sha-256 26:36:B2:06:96:84:97:6B:EA:58:72:C6:70:7B:B9:D1:29:07:C3:BD:04:E3:8C:0C:21:3B:A1:4E:43:92:96:B3

What it says is that the description you log (26:36:B2) is not the description produced by the last CreateOffer you called on that PeerConnection (CB:4E:B5).

It's likely that through some code path not in your example, you called CreateOffer again between the first CreateOffer and the SetLocalDescription.

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[lx]

Thank you.  I fix it by:

#######################################################

  socket.on('create or join', function(room) {

    log('Received request to create or join room ' + room);

    var clientsInRoom = io.sockets.adapter.rooms[room];

    var numClients = clientsInRoom ? Object.keys(clientsInRoom.sockets).length : 0;

    log('Room ' + room + ' now has ' + numClients + ' client(s)');

    if (numClients === 0) {

      socket.join(room);

      log('Client ID ' + socket.id + ' created room ' + room);

      socket.emit('created', room, socket.id);

    } else if (numClients === 1) {

      log('Client ID ' + socket.id + ' joined room ' + room);

      // io.sockets.in(room).emit('join', room);

      socket.join(room);

      socket.emit('joined', room, socket.id);

      io.sockets.in(room).emit('ready', room);

      //socket.broadcast.emit('ready', room);

    } else { // max two clients

      socket.emit('full', room);

    }

  });

######################################################

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