traceablepeerconnection/index.js

Lowlevel RTCPeerConnection wrapper which allows tracing the API calls

// based on https://github.com/ESTOS/strophe.jingle/
// adds wildemitter support
var util = require('util');
var adapter = require('webrtc-adapter'); // jshint ignore:line
var WildEmitter = require('wildemitter');

function dumpSDP(description) {
    return {
        type: description.type,
        sdp: description.sdp
    };
}

function dumpStream(stream) {
    var info = {
        label: stream.id,
    };
    if (stream.getAudioTracks().length) {
        info.audio = stream.getAudioTracks().map(function (track) {
            return track.id;
        });
    }
    if (stream.getVideoTracks().length) {
        info.video = stream.getVideoTracks().map(function (track) {
            return track.id;
        });
    }
    return info;
}

function TraceablePeerConnection(config, constraints) {
    var self = this;
    WildEmitter.call(this);

    this.peerconnection = new window.RTCPeerConnection(config, constraints);

    this.trace = function (what, info) {
        self.emit('PeerConnectionTrace', {
            time: new Date(),
            type: what,
            value: info || ""
        });
    };

    this.onicecandidate = null;
    this.peerconnection.onicecandidate = function (event) {
        self.trace('onicecandidate', event.candidate);
        if (self.onicecandidate !== null) {
            self.onicecandidate(event);
        }
    };
    this.onaddstream = null;
    this.peerconnection.onaddstream = function (event) {
        self.trace('onaddstream', dumpStream(event.stream));
        if (self.onaddstream !== null) {
            self.onaddstream(event);
        }
    };
    this.onremovestream = null;
    this.peerconnection.onremovestream = function (event) {
        self.trace('onremovestream', dumpStream(event.stream));
        if (self.onremovestream !== null) {
            self.onremovestream(event);
        }
    };
    this.onsignalingstatechange = null;
    this.peerconnection.onsignalingstatechange = function (event) {
        self.trace('onsignalingstatechange', self.signalingState);
        if (self.onsignalingstatechange !== null) {
            self.onsignalingstatechange(event);
        }
    };
    this.oniceconnectionstatechange = null;
    this.peerconnection.oniceconnectionstatechange = function (event) {
        self.trace('oniceconnectionstatechange', self.iceConnectionState);
        if (self.oniceconnectionstatechange !== null) {
            self.oniceconnectionstatechange(event);
        }
    };
    this.onnegotiationneeded = null;
    this.peerconnection.onnegotiationneeded = function (event) {
        self.trace('onnegotiationneeded');
        if (self.onnegotiationneeded !== null) {
            self.onnegotiationneeded(event);
        }
    };
    self.ondatachannel = null;
    this.peerconnection.ondatachannel = function (event) {
        self.trace('ondatachannel', event);
        if (self.ondatachannel !== null) {
            self.ondatachannel(event);
        }
    };
    this.getLocalStreams = this.peerconnection.getLocalStreams.bind(this.peerconnection);
    this.getRemoteStreams = this.peerconnection.getRemoteStreams.bind(this.peerconnection);
}

util.inherits(TraceablePeerConnection, WildEmitter);

['signalingState', 'iceConnectionState', 'localDescription', 'remoteDescription'].forEach(function (prop) {
    Object.defineProperty(TraceablePeerConnection.prototype, prop, {
        get: function () {
            return this.peerconnection[prop];
        }
    });
});

TraceablePeerConnection.prototype.addStream = function (stream) {
    this.trace('addStream', dumpStream(stream));
    this.peerconnection.addStream(stream);
};

TraceablePeerConnection.prototype.removeStream = function (stream) {
    this.trace('removeStream', dumpStream(stream));
    this.peerconnection.removeStream(stream);
};

TraceablePeerConnection.prototype.createDataChannel = function (label, opts) {
    this.trace('createDataChannel', label, opts);
    return this.peerconnection.createDataChannel(label, opts);
};

TraceablePeerConnection.prototype.setLocalDescription = function (description, successCallback, failureCallback) {
    var self = this;
    this.trace('setLocalDescription', dumpSDP(description));
    return this.peerconnection.setLocalDescription(
        description
    ).then(
        function () {
            self.trace('setLocalDescriptionOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('setLocalDescriptionOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.setRemoteDescription = function (description, successCallback, failureCallback) {
    var self = this;
    this.trace('setRemoteDescription', dumpSDP(description));
    return this.peerconnection.setRemoteDescription(
        description
    ).then(
        function () {
            self.trace('setRemoteDescriptionOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('setRemoteDescriptionOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.close = function () {
    this.trace('stop');
    if (this.peerconnection.signalingState != 'closed') {
        this.peerconnection.close();
    }
};

TraceablePeerConnection.prototype.createOffer = function (successCallback, failureCallback, constraints) {
    var self = this;
    this.trace('createOffer', constraints);
    return this.peerconnection.createOffer(
        constraints
    ).then(
        function (offer) {
            self.trace('createOfferOnSuccess', dumpSDP(offer));
            if (successCallback) successCallback(offer);
        },
        function (err) {
            self.trace('createOfferOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.createAnswer = function (successCallback, failureCallback, constraints) {
    var self = this;
    this.trace('createAnswer', constraints);
    return this.peerconnection.createAnswer(
        constraints
    ).then(
        function (answer) {
            self.trace('createAnswerOnSuccess', dumpSDP(answer));
            if (successCallback) successCallback(answer);
        },
        function (err) {
            self.trace('createAnswerOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.addIceCandidate = function (candidate, successCallback, failureCallback) {
    var self = this;
    this.trace('addIceCandidate', candidate);
    return this.peerconnection.addIceCandidate(
        candidate
    ).then(
        function () {
            //self.trace('addIceCandidateOnSuccess');
            if (successCallback) successCallback();
        },
        function (err) {
            self.trace('addIceCandidateOnFailure', err);
            if (failureCallback) failureCallback(err);
        }
    );
};

TraceablePeerConnection.prototype.getStats = function () {
    this.peerconnection.getStats.apply(this.peerconnection, arguments);
};

module.exports = TraceablePeerConnection;