/* global config, APP, Strophe */ // cache datachannels to avoid garbage collection // https://code.google.com/p/chromium/issues/detail?id=405545 var RTCEvents = require("../../service/RTC/RTCEvents"); var _dataChannels = []; var eventEmitter = null; var DataChannels = { /** * Callback triggered by PeerConnection when new data channel is opened * on the bridge. * @param event the event info object. */ onDataChannel: function (event) { var dataChannel = event.channel; dataChannel.onopen = function () { console.info("Data channel opened by the Videobridge!", dataChannel); // Code sample for sending string and/or binary data // Sends String message to the bridge //dataChannel.send("Hello bridge!"); // Sends 12 bytes binary message to the bridge //dataChannel.send(new ArrayBuffer(12)); eventEmitter.emit(RTCEvents.DATA_CHANNEL_OPEN); }; dataChannel.onerror = function (error) { console.error("Data Channel Error:", error, dataChannel); }; dataChannel.onmessage = function (event) { var data = event.data; // JSON var obj; try { obj = JSON.parse(data); } catch (e) { console.error( "Failed to parse data channel message as JSON: ", data, dataChannel); } if (('undefined' !== typeof(obj)) && (null !== obj)) { var colibriClass = obj.colibriClass; if ("DominantSpeakerEndpointChangeEvent" === colibriClass) { // Endpoint ID from the Videobridge. var dominantSpeakerEndpoint = obj.dominantSpeakerEndpoint; console.info( "Data channel new dominant speaker event: ", dominantSpeakerEndpoint); eventEmitter.emit(RTCEvents.DOMINANTSPEAKER_CHANGED, dominantSpeakerEndpoint); } else if ("InLastNChangeEvent" === colibriClass) { var oldValue = obj.oldValue; var newValue = obj.newValue; // Make sure that oldValue and newValue are of type boolean. var type; if ((type = typeof oldValue) !== 'boolean') { if (type === 'string') { oldValue = (oldValue == "true"); } else { oldValue = new Boolean(oldValue).valueOf(); } } if ((type = typeof newValue) !== 'boolean') { if (type === 'string') { newValue = (newValue == "true"); } else { newValue = new Boolean(newValue).valueOf(); } } eventEmitter.emit(RTCEvents.LASTN_CHANGED, oldValue, newValue); } else if ("LastNEndpointsChangeEvent" === colibriClass) { // The new/latest list of last-n endpoint IDs. var lastNEndpoints = obj.lastNEndpoints; // The list of endpoint IDs which are entering the list of // last-n at this time i.e. were not in the old list of last-n // endpoint IDs. var endpointsEnteringLastN = obj.endpointsEnteringLastN; console.log( "Data channel new last-n event: ", lastNEndpoints, endpointsEnteringLastN, obj); eventEmitter.emit(RTCEvents.LASTN_ENDPOINT_CHANGED, lastNEndpoints, endpointsEnteringLastN, obj); } else { console.debug("Data channel JSON-formatted message: ", obj); } } }; dataChannel.onclose = function () { console.info("The Data Channel closed", dataChannel); var idx = _dataChannels.indexOf(dataChannel); if (idx > -1) _dataChannels = _dataChannels.splice(idx, 1); }; _dataChannels.push(dataChannel); }, /** * Binds "ondatachannel" event listener to given PeerConnection instance. * @param peerConnection WebRTC peer connection instance. */ init: function (peerConnection, emitter) { if(!config.openSctp) return; peerConnection.ondatachannel = this.onDataChannel; eventEmitter = emitter; // Sample code for opening new data channel from Jitsi Meet to the bridge. // Although it's not a requirement to open separate channels from both bridge // and peer as single channel can be used for sending and receiving data. // So either channel opened by the bridge or the one opened here is enough // for communication with the bridge. /*var dataChannelOptions = { reliable: true }; var dataChannel = peerConnection.createDataChannel("myChannel", dataChannelOptions); // Can be used only when is in open state dataChannel.onopen = function () { dataChannel.send("My channel !!!"); }; dataChannel.onmessage = function (event) { var msgData = event.data; console.info("Got My Data Channel Message:", msgData, dataChannel); };*/ }, handleSelectedEndpointEvent: onSelectedEndpointChanged, handlePinnedEndpointEvent: onPinnedEndpointChanged }; function onSelectedEndpointChanged(userResource) { console.log('selected endpoint changed: ', userResource); if (_dataChannels && _dataChannels.length != 0) { _dataChannels.some(function (dataChannel) { if (dataChannel.readyState == 'open') { console.log('sending selected endpoint changed ' + 'notification to the bridge: ', userResource); dataChannel.send(JSON.stringify({ 'colibriClass': 'SelectedEndpointChangedEvent', 'selectedEndpoint': (!userResource || userResource === null)? null : userResource })); return true; } }); } } function onPinnedEndpointChanged(userResource) { console.log('pinned endpoint changed: ', userResource); if (_dataChannels && _dataChannels.length !== 0) { _dataChannels.some(function (dataChannel) { if (dataChannel.readyState == 'open') { dataChannel.send(JSON.stringify({ 'colibriClass': 'PinnedEndpointChangedEvent', 'pinnedEndpoint': userResource ? userResource : null })); return true; } }); } } module.exports = DataChannels;