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kurento-utils.js
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kurento-utils.js
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(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.kurentoUtils = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
var freeice = require('freeice');
var inherits = require('inherits');
var UAParser = require('ua-parser-js');
var uuidv4 = require('uuid/v4');
var hark = require('hark');
var EventEmitter = require('events').EventEmitter;
var recursive = require('merge').recursive.bind(undefined, true);
var sdpTranslator = require('sdp-translator');
var logger = typeof window === 'undefined' ? console : window.Logger || console;
try {
(function () {
throw new Error('Cannot find module \'kurento-browser-extensions\' from \'c:\\SSAFY\\fifth\\kurento-utils-js\\lib\'');
}());
} catch (error) {
if (typeof getScreenConstraints === 'undefined') {
logger.warn('screen sharing is not available');
getScreenConstraints = function getScreenConstraints(sendSource, callback) {
callback(new Error('This library is not enabled for screen sharing'));
};
}
}
var MEDIA_CONSTRAINTS = {
audio: true,
video: {
width: 640,
framerate: 15
}
};
var ua = typeof window !== 'undefined' && window.navigator ? window.navigator.userAgent : '';
var parser = new UAParser(ua);
var browser = parser.getBrowser();
function insertScriptSrcInHtmlDom(scriptSrc) {
var script = document.createElement('script');
script.src = scriptSrc;
var ref = document.querySelector('script');
ref.parentNode.insertBefore(script, ref);
}
function importScriptsDependsOnBrowser() {
if (browser.name === 'IE') {
insertScriptSrcInHtmlDom('https://cdn.temasys.io/adapterjs/0.15.x/adapter.debug.js');
}
}
importScriptsDependsOnBrowser();
var usePlanB = false;
if (browser.name === 'Chrome' || browser.name === 'Chromium') {
logger.debug(browser.name + ': using SDP PlanB');
usePlanB = true;
}
function noop(error) {
if (error)
logger.error(error);
}
function trackStop(track) {
track.stop && track.stop();
}
function streamStop(stream) {
stream.getTracks().forEach(trackStop);
}
var dumpSDP = function (description) {
if (typeof description === 'undefined' || description === null) {
return '';
}
return 'type: ' + description.type + '\r\n' + description.sdp;
};
function bufferizeCandidates(pc, onerror) {
var candidatesQueue = [];
function setSignalingstatechangeAccordingWwebBrowser(functionToExecute, pc) {
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
pc.onsignalingstatechange = functionToExecute;
} else {
pc.addEventListener('signalingstatechange', functionToExecute);
}
}
var signalingstatechangeFunction = function () {
if (pc.signalingState === 'stable') {
while (candidatesQueue.length) {
var entry = candidatesQueue.shift();
pc.addIceCandidate(entry.candidate, entry.callback, entry.callback);
}
}
};
setSignalingstatechangeAccordingWwebBrowser(signalingstatechangeFunction, pc);
return function (candidate, callback) {
callback = callback || onerror;
switch (pc.signalingState) {
case 'closed':
callback(new Error('PeerConnection object is closed'));
break;
case 'stable':
if (pc.remoteDescription) {
pc.addIceCandidate(candidate, callback, callback);
break;
}
default:
candidatesQueue.push({
candidate: candidate,
callback: callback
});
}
};
}
function removeFIDFromOffer(sdp) {
var n = sdp.indexOf('a=ssrc-group:FID');
if (n > 0) {
return sdp.slice(0, n);
} else {
return sdp;
}
}
function getSimulcastInfo(videoStream) {
var videoTracks = videoStream.getVideoTracks();
if (!videoTracks.length) {
logger.warn('No video tracks available in the video stream');
return '';
}
var lines = [
'a=x-google-flag:conference',
'a=ssrc-group:SIM 1 2 3',
'a=ssrc:1 cname:localVideo',
'a=ssrc:1 msid:' + videoStream.id + ' ' + videoTracks[0].id,
'a=ssrc:1 mslabel:' + videoStream.id,
'a=ssrc:1 label:' + videoTracks[0].id,
'a=ssrc:2 cname:localVideo',
'a=ssrc:2 msid:' + videoStream.id + ' ' + videoTracks[0].id,
'a=ssrc:2 mslabel:' + videoStream.id,
'a=ssrc:2 label:' + videoTracks[0].id,
'a=ssrc:3 cname:localVideo',
'a=ssrc:3 msid:' + videoStream.id + ' ' + videoTracks[0].id,
'a=ssrc:3 mslabel:' + videoStream.id,
'a=ssrc:3 label:' + videoTracks[0].id
];
lines.push('');
return lines.join('\n');
}
function sleep(milliseconds) {
var start = new Date().getTime();
for (var i = 0; i < 10000000; i++) {
if (new Date().getTime() - start > milliseconds) {
break;
}
}
}
function setIceCandidateAccordingWebBrowser(functionToExecute, pc) {
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
pc.onicecandidate = functionToExecute;
} else {
pc.addEventListener('icecandidate', functionToExecute);
}
}
function WebRtcPeer(mode, options, callback) {
if (!(this instanceof WebRtcPeer)) {
return new WebRtcPeer(mode, options, callback);
}
WebRtcPeer.super_.call(this);
if (options instanceof Function) {
callback = options;
options = undefined;
}
options = options || {};
callback = (callback || noop).bind(this);
var self = this;
var localVideo = options.localVideo;
var remoteVideo = options.remoteVideo;
var videoStream = options.videoStream;
var audioStream = options.audioStream;
var mediaConstraints = options.mediaConstraints;
var pc = options.peerConnection;
var sendSource = options.sendSource || 'webcam';
var dataChannelConfig = options.dataChannelConfig;
var useDataChannels = options.dataChannels || false;
var dataChannel;
var guid = uuidv4();
var configuration = recursive({ iceServers: freeice() }, options.configuration);
var onicecandidate = options.onicecandidate;
if (onicecandidate)
this.on('icecandidate', onicecandidate);
var oncandidategatheringdone = options.oncandidategatheringdone;
if (oncandidategatheringdone) {
this.on('candidategatheringdone', oncandidategatheringdone);
}
var simulcast = options.simulcast;
var multistream = options.multistream;
var interop = new sdpTranslator.Interop();
var candidatesQueueOut = [];
var candidategatheringdone = false;
Object.defineProperties(this, {
'peerConnection': {
get: function () {
return pc;
}
},
'id': {
value: options.id || guid,
writable: false
},
'remoteVideo': {
get: function () {
return remoteVideo;
}
},
'localVideo': {
get: function () {
return localVideo;
}
},
'dataChannel': {
get: function () {
return dataChannel;
}
},
'currentFrame': {
get: function () {
if (!remoteVideo)
return;
if (remoteVideo.readyState < remoteVideo.HAVE_CURRENT_DATA)
throw new Error('No video stream data available');
var canvas = document.createElement('canvas');
canvas.width = remoteVideo.videoWidth;
canvas.height = remoteVideo.videoHeight;
canvas.getContext('2d').drawImage(remoteVideo, 0, 0);
return canvas;
}
}
});
if (!pc) {
pc = new RTCPeerConnection(configuration);
if (useDataChannels && !dataChannel) {
var dcId = 'WebRtcPeer-' + self.id;
var dcOptions = undefined;
if (dataChannelConfig) {
dcId = dataChannelConfig.id || dcId;
dcOptions = dataChannelConfig.options;
}
dataChannel = pc.createDataChannel(dcId, dcOptions);
if (dataChannelConfig) {
dataChannel.onopen = dataChannelConfig.onopen;
dataChannel.onclose = dataChannelConfig.onclose;
dataChannel.onmessage = dataChannelConfig.onmessage;
dataChannel.onbufferedamountlow = dataChannelConfig.onbufferedamountlow;
dataChannel.onerror = dataChannelConfig.onerror || noop;
}
}
}
if (!pc.getLocalStreams && pc.getSenders) {
pc.getLocalStreams = function () {
var stream = new MediaStream();
pc.getSenders().forEach(function (sender) {
stream.addTrack(sender.track);
});
return [stream];
};
}
if (!pc.getRemoteStreams && pc.getReceivers) {
pc.getRemoteStreams = function () {
var stream = new MediaStream();
pc.getReceivers().forEach(function (sender) {
stream.addTrack(sender.track);
});
return [stream];
};
}
var iceCandidateFunction = function (event) {
var candidate = event.candidate;
if (EventEmitter.listenerCount(self, 'icecandidate') || EventEmitter.listenerCount(self, 'candidategatheringdone')) {
if (candidate) {
var cand;
if (multistream && usePlanB) {
cand = interop.candidateToUnifiedPlan(candidate);
} else {
cand = candidate;
}
if (typeof AdapterJS === 'undefined') {
self.emit('icecandidate', cand);
}
candidategatheringdone = false;
} else if (!candidategatheringdone) {
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
EventEmitter.prototype.emit('candidategatheringdone', cand);
} else {
self.emit('candidategatheringdone');
}
candidategatheringdone = true;
}
} else if (!candidategatheringdone) {
candidatesQueueOut.push(candidate);
if (!candidate)
candidategatheringdone = true;
}
};
setIceCandidateAccordingWebBrowser(iceCandidateFunction, pc);
pc.onaddstream = options.onaddstream;
pc.onnegotiationneeded = options.onnegotiationneeded;
this.on('newListener', function (event, listener) {
if (event === 'icecandidate' || event === 'candidategatheringdone') {
while (candidatesQueueOut.length) {
var candidate = candidatesQueueOut.shift();
if (!candidate === (event === 'candidategatheringdone')) {
listener(candidate);
}
}
}
});
var addIceCandidate = bufferizeCandidates(pc);
this.addIceCandidate = function (iceCandidate, callback) {
var candidate;
if (multistream && usePlanB) {
candidate = interop.candidateToPlanB(iceCandidate);
} else {
candidate = new RTCIceCandidate(iceCandidate);
}
logger.debug('Remote ICE candidate received', iceCandidate);
callback = (callback || noop).bind(this);
addIceCandidate(candidate, callback);
};
this.generateOffer = function (callback) {
callback = callback.bind(this);
if (mode === 'recvonly') {
var useAudio = mediaConstraints && typeof mediaConstraints.audio === 'boolean' ? mediaConstraints.audio : true;
var useVideo = mediaConstraints && typeof mediaConstraints.video === 'boolean' ? mediaConstraints.video : true;
if (useAudio) {
pc.addTransceiver('audio', { direction: 'recvonly' });
}
if (useVideo) {
pc.addTransceiver('video', { direction: 'recvonly' });
}
} else if (mode === 'sendonly') {
pc.getTransceivers().forEach(function (transceiver) {
transceiver.direction = 'sendonly';
});
}
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
var setLocalDescriptionOnSuccess = function () {
sleep(1000);
var localDescription = pc.localDescription;
logger.debug('Local description set\n', localDescription.sdp);
if (multistream && usePlanB) {
localDescription = interop.toUnifiedPlan(localDescription);
logger.debug('offer::origPlanB->UnifiedPlan', dumpSDP(localDescription));
}
callback(null, localDescription.sdp, self.processAnswer.bind(self));
};
var createOfferOnSuccess = function (offer) {
logger.debug('Created SDP offer');
logger.debug('Local description set\n', pc.localDescription);
pc.setLocalDescription(offer, setLocalDescriptionOnSuccess, callback);
};
pc.createOffer(createOfferOnSuccess, callback);
} else {
pc.createOffer().then(function (offer) {
logger.debug('Created SDP offer');
offer = mangleSdpToAddSimulcast(offer);
return pc.setLocalDescription(offer);
}).then(function () {
var localDescription = pc.localDescription;
logger.debug('Local description set\n', localDescription.sdp);
if (multistream && usePlanB) {
localDescription = interop.toUnifiedPlan(localDescription);
logger.debug('offer::origPlanB->UnifiedPlan', dumpSDP(localDescription));
}
callback(null, localDescription.sdp, self.processAnswer.bind(self));
}).catch(callback);
}
};
this.getLocalSessionDescriptor = function () {
return pc.localDescription;
};
this.getRemoteSessionDescriptor = function () {
return pc.remoteDescription;
};
function setRemoteVideo() {
if (remoteVideo) {
remoteVideo.pause();
var stream = pc.getRemoteStreams()[0];
remoteVideo.srcObject = stream;
logger.debug('Remote stream:', stream);
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
remoteVideo = attachMediaStream(remoteVideo, stream);
} else {
remoteVideo.load();
}
}
}
this.showLocalVideo = function () {
localVideo.srcObject = videoStream;
localVideo.muted = true;
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
localVideo = attachMediaStream(localVideo, videoStream);
}
};
this.send = function (data) {
if (dataChannel && dataChannel.readyState === 'open') {
dataChannel.send(data);
} else {
logger.warn('Trying to send data over a non-existing or closed data channel');
}
};
this.processAnswer = function (sdpAnswer, callback) {
callback = (callback || noop).bind(this);
var answer = new RTCSessionDescription({
type: 'answer',
sdp: sdpAnswer
});
if (multistream && usePlanB) {
var planBAnswer = interop.toPlanB(answer);
logger.debug('asnwer::planB', dumpSDP(planBAnswer));
answer = planBAnswer;
}
logger.debug('SDP answer received, setting remote description');
if (pc.signalingState === 'closed') {
return callback('PeerConnection is closed');
}
pc.setRemoteDescription(answer).then(function () {
setRemoteVideo();
callback();
}, callback);
};
this.processOffer = function (sdpOffer, callback) {
callback = callback.bind(this);
var offer = new RTCSessionDescription({
type: 'offer',
sdp: sdpOffer
});
if (multistream && usePlanB) {
var planBOffer = interop.toPlanB(offer);
logger.debug('offer::planB', dumpSDP(planBOffer));
offer = planBOffer;
}
logger.debug('SDP offer received, setting remote description');
if (pc.signalingState === 'closed') {
return callback('PeerConnection is closed');
}
pc.setRemoteDescription(offer).then(function () {
return setRemoteVideo();
}).then(function () {
return pc.createAnswer();
}).then(function (answer) {
answer = mangleSdpToAddSimulcast(answer);
logger.debug('Created SDP answer');
return pc.setLocalDescription(answer);
}).then(function () {
var localDescription = pc.localDescription;
if (multistream && usePlanB) {
localDescription = interop.toUnifiedPlan(localDescription);
logger.debug('answer::origPlanB->UnifiedPlan', dumpSDP(localDescription));
}
logger.debug('Local description set\n', localDescription.sdp);
callback(null, localDescription.sdp);
}).catch(callback);
};
function mangleSdpToAddSimulcast(answer) {
if (simulcast) {
if (browser.name === 'Chrome' || browser.name === 'Chromium') {
logger.debug('Adding multicast info');
answer = new RTCSessionDescription({
'type': answer.type,
'sdp': removeFIDFromOffer(answer.sdp) + getSimulcastInfo(videoStream)
});
} else {
logger.warn('Simulcast is only available in Chrome browser.');
}
}
return answer;
}
function start() {
if (pc.signalingState === 'closed') {
callback('The peer connection object is in "closed" state. This is most likely due to an invocation of the dispose method before accepting in the dialogue');
}
if (videoStream && localVideo) {
self.showLocalVideo();
}
if (videoStream) {
videoStream.getTracks().forEach(function (track) {
pc.addTrack(track, videoStream);
});
}
if (audioStream) {
audioStream.getTracks().forEach(function (track) {
pc.addTrack(track, audioStream);
});
}
callback();
}
if (mode !== 'recvonly' && !videoStream && !audioStream) {
function getMedia(constraints) {
if (constraints === undefined) {
constraints = MEDIA_CONSTRAINTS;
}
if (typeof AdapterJS !== 'undefined' && AdapterJS.webrtcDetectedBrowser === 'IE' && AdapterJS.webrtcDetectedVersion >= 9) {
navigator.getUserMedia(constraints, function (stream) {
videoStream = stream;
start();
}, callback);
} else {
navigator.mediaDevices.getUserMedia(constraints).then(function (stream) {
videoStream = stream;
start();
}).catch(callback);
}
}
if (sendSource === 'webcam') {
getMedia(mediaConstraints);
} else {
getScreenConstraints(sendSource, function (error, constraints_) {
if (error)
return callback(error);
constraints = [mediaConstraints];
constraints.unshift(constraints_);
getMedia(recursive.apply(undefined, constraints));
}, guid);
}
} else {
setTimeout(start, 0);
}
this.on('_dispose', function () {
if (localVideo) {
localVideo.pause();
localVideo.srcObject = null;
if (typeof AdapterJS === 'undefined') {
localVideo.load();
}
localVideo.muted = false;
}
if (remoteVideo) {
remoteVideo.pause();
remoteVideo.srcObject = null;
if (typeof AdapterJS === 'undefined') {
remoteVideo.load();
}
}
self.removeAllListeners();
if (typeof window !== 'undefined' && window.cancelChooseDesktopMedia !== undefined) {
window.cancelChooseDesktopMedia(guid);
}
});
}
inherits(WebRtcPeer, EventEmitter);
function createEnableDescriptor(type) {
var method = 'get' + type + 'Tracks';
return {
enumerable: true,
get: function () {
if (!this.peerConnection)
return;
var streams = this.peerConnection.getLocalStreams();
if (!streams.length)
return;
for (var i = 0, stream; stream = streams[i]; i++) {
var tracks = stream[method]();
for (var j = 0, track; track = tracks[j]; j++)
if (!track.enabled)
return false;
}
return true;
},
set: function (value) {
function trackSetEnable(track) {
track.enabled = value;
}
this.peerConnection.getLocalStreams().forEach(function (stream) {
stream[method]().forEach(trackSetEnable);
});
}
};
}
Object.defineProperties(WebRtcPeer.prototype, {
'enabled': {
enumerable: true,
get: function () {
return this.audioEnabled && this.videoEnabled;
},
set: function (value) {
this.audioEnabled = this.videoEnabled = value;
}
},
'audioEnabled': createEnableDescriptor('Audio'),
'videoEnabled': createEnableDescriptor('Video')
});
WebRtcPeer.prototype.getLocalStream = function (index) {
if (this.peerConnection) {
return this.peerConnection.getLocalStreams()[index || 0];
}
};
WebRtcPeer.prototype.getRemoteStream = function (index) {
if (this.peerConnection) {
return this.peerConnection.getRemoteStreams()[index || 0];
}
};
WebRtcPeer.prototype.dispose = function () {
logger.debug('Disposing WebRtcPeer');
var pc = this.peerConnection;
var dc = this.dataChannel;
try {
if (dc) {
if (dc.readyState === 'closed')
return;
dc.close();
}
if (pc) {
if (pc.signalingState === 'closed')
return;
pc.getLocalStreams().forEach(streamStop);
pc.close();
}
} catch (err) {
logger.warn('Exception disposing webrtc peer ' + err);
}
if (typeof AdapterJS === 'undefined') {
this.emit('_dispose');
}
};
function WebRtcPeerRecvonly(options, callback) {
if (!(this instanceof WebRtcPeerRecvonly)) {
return new WebRtcPeerRecvonly(options, callback);
}
WebRtcPeerRecvonly.super_.call(this, 'recvonly', options, callback);
}
inherits(WebRtcPeerRecvonly, WebRtcPeer);
function WebRtcPeerSendonly(options, callback) {
if (!(this instanceof WebRtcPeerSendonly)) {
return new WebRtcPeerSendonly(options, callback);
}
WebRtcPeerSendonly.super_.call(this, 'sendonly', options, callback);
}
inherits(WebRtcPeerSendonly, WebRtcPeer);
function WebRtcPeerSendrecv(options, callback) {
if (!(this instanceof WebRtcPeerSendrecv)) {
return new WebRtcPeerSendrecv(options, callback);
}
WebRtcPeerSendrecv.super_.call(this, 'sendrecv', options, callback);
}
inherits(WebRtcPeerSendrecv, WebRtcPeer);
function harkUtils(stream, options) {
return hark(stream, options);
}
exports.bufferizeCandidates = bufferizeCandidates;
exports.WebRtcPeerRecvonly = WebRtcPeerRecvonly;
exports.WebRtcPeerSendonly = WebRtcPeerSendonly;
exports.WebRtcPeerSendrecv = WebRtcPeerSendrecv;
exports.hark = harkUtils;
},{"events":4,"freeice":5,"hark":8,"inherits":9,"merge":10,"sdp-translator":17,"ua-parser-js":20,"uuid/v4":23}],2:[function(require,module,exports){
if (window.addEventListener)
module.exports = require('./index');
},{"./index":3}],3:[function(require,module,exports){
var WebRtcPeer = require('./WebRtcPeer');
exports.WebRtcPeer = WebRtcPeer;
},{"./WebRtcPeer":1}],4:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var objectCreate = Object.create || objectCreatePolyfill
var objectKeys = Object.keys || objectKeysPolyfill
var bind = Function.prototype.bind || functionBindPolyfill
function EventEmitter() {
if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
this._events = objectCreate(null);
this._eventsCount = 0;
}
this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;
// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;
// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
var defaultMaxListeners = 10;
var hasDefineProperty;
try {
var o = {};
if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
hasDefineProperty = o.x === 0;
} catch (err) { hasDefineProperty = false }
if (hasDefineProperty) {
Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
enumerable: true,
get: function() {
return defaultMaxListeners;
},
set: function(arg) {
// check whether the input is a positive number (whose value is zero or
// greater and not a NaN).
if (typeof arg !== 'number' || arg < 0 || arg !== arg)
throw new TypeError('"defaultMaxListeners" must be a positive number');
defaultMaxListeners = arg;
}
});
} else {
EventEmitter.defaultMaxListeners = defaultMaxListeners;
}
// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || isNaN(n))
throw new TypeError('"n" argument must be a positive number');
this._maxListeners = n;
return this;
};
function $getMaxListeners(that) {
if (that._maxListeners === undefined)
return EventEmitter.defaultMaxListeners;
return that._maxListeners;
}
EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
return $getMaxListeners(this);
};
// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
if (isFn)
handler.call(self);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self);
}
}
function emitOne(handler, isFn, self, arg1) {
if (isFn)
handler.call(self, arg1);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1);
}
}
function emitTwo(handler, isFn, self, arg1, arg2) {
if (isFn)
handler.call(self, arg1, arg2);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2);
}
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
if (isFn)
handler.call(self, arg1, arg2, arg3);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2, arg3);
}
}
function emitMany(handler, isFn, self, args) {
if (isFn)
handler.apply(self, args);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].apply(self, args);
}
}
EventEmitter.prototype.emit = function emit(type) {
var er, handler, len, args, i, events;
var doError = (type === 'error');
events = this._events;
if (events)
doError = (doError && events.error == null);
else if (!doError)
return false;
// If there is no 'error' event listener then throw.
if (doError) {
if (arguments.length > 1)
er = arguments[1];
if (er instanceof Error) {
throw er; // Unhandled 'error' event
} else {
// At least give some kind of context to the user
var err = new Error('Unhandled "error" event. (' + er + ')');
err.context = er;
throw err;
}
return false;
}
handler = events[type];
if (!handler)
return false;
var isFn = typeof handler === 'function';
len = arguments.length;
switch (len) {
// fast cases
case 1:
emitNone(handler, isFn, this);
break;
case 2:
emitOne(handler, isFn, this, arguments[1]);
break;
case 3:
emitTwo(handler, isFn, this, arguments[1], arguments[2]);
break;
case 4:
emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
break;
// slower
default:
args = new Array(len - 1);
for (i = 1; i < len; i++)
args[i - 1] = arguments[i];
emitMany(handler, isFn, this, args);
}
return true;
};
function _addListener(target, type, listener, prepend) {
var m;
var events;
var existing;
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
events = target._events;
if (!events) {
events = target._events = objectCreate(null);
target._eventsCount = 0;
} else {
// To avoid recursion in the case that type === "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (events.newListener) {
target.emit('newListener', type,
listener.listener ? listener.listener : listener);
// Re-assign `events` because a newListener handler could have caused the
// this._events to be assigned to a new object
events = target._events;
}
existing = events[type];
}
if (!existing) {
// Optimize the case of one listener. Don't need the extra array object.
existing = events[type] = listener;
++target._eventsCount;
} else {
if (typeof existing === 'function') {
// Adding the second element, need to change to array.
existing = events[type] =
prepend ? [listener, existing] : [existing, listener];
} else {
// If we've already got an array, just append.
if (prepend) {
existing.unshift(listener);
} else {
existing.push(listener);
}
}
// Check for listener leak
if (!existing.warned) {
m = $getMaxListeners(target);
if (m && m > 0 && existing.length > m) {
existing.warned = true;
var w = new Error('Possible EventEmitter memory leak detected. ' +
existing.length + ' "' + String(type) + '" listeners ' +
'added. Use emitter.setMaxListeners() to ' +
'increase limit.');
w.name = 'MaxListenersExceededWarning';
w.emitter = target;
w.type = type;
w.count = existing.length;
if (typeof console === 'object' && console.warn) {
console.warn('%s: %s', w.name, w.message);
}
}
}
}
return target;
}
EventEmitter.prototype.addListener = function addListener(type, listener) {
return _addListener(this, type, listener, false);
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener;
EventEmitter.prototype.prependListener =
function prependListener(type, listener) {
return _addListener(this, type, listener, true);
};
function onceWrapper() {
if (!this.fired) {
this.target.removeListener(this.type, this.wrapFn);
this.fired = true;
switch (arguments.length) {
case 0:
return this.listener.call(this.target);
case 1:
return this.listener.call(this.target, arguments[0]);
case 2:
return this.listener.call(this.target, arguments[0], arguments[1]);
case 3:
return this.listener.call(this.target, arguments[0], arguments[1],
arguments[2]);
default:
var args = new Array(arguments.length);
for (var i = 0; i < args.length; ++i)
args[i] = arguments[i];
this.listener.apply(this.target, args);
}
}
}
function _onceWrap(target, type, listener) {
var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
var wrapped = bind.call(onceWrapper, state);
wrapped.listener = listener;
state.wrapFn = wrapped;
return wrapped;
}
EventEmitter.prototype.once = function once(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.on(type, _onceWrap(this, type, listener));
return this;
};
EventEmitter.prototype.prependOnceListener =
function prependOnceListener(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.prependListener(type, _onceWrap(this, type, listener));
return this;
};
// Emits a 'removeListener' event if and only if the listener was removed.
EventEmitter.prototype.removeListener =
function removeListener(type, listener) {
var list, events, position, i, originalListener;
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
events = this._events;
if (!events)
return this;
list = events[type];
if (!list)
return this;
if (list === listener || list.listener === listener) {
if (--this._eventsCount === 0)
this._events = objectCreate(null);
else {
delete events[type];
if (events.removeListener)
this.emit('removeListener', type, list.listener || listener);
}
} else if (typeof list !== 'function') {
position = -1;