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gecko/dom/media/PeerConnection.js

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
const PC_CONTRACT = "@mozilla.org/dom/peerconnection;1";
const PC_OBS_CONTRACT = "@mozilla.org/dom/peerconnectionobserver;1";
const PC_ICE_CONTRACT = "@mozilla.org/dom/rtcicecandidate;1";
const PC_SESSION_CONTRACT = "@mozilla.org/dom/rtcsessiondescription;1";
const PC_MANAGER_CONTRACT = "@mozilla.org/dom/peerconnectionmanager;1";
const PC_STATS_CONTRACT = "@mozilla.org/dom/rtcstatsreport;1";
const PC_CID = Components.ID("{00e0e20d-1494-4776-8e0e-0f0acbea3c79}");
const PC_OBS_CID = Components.ID("{1d44a18e-4545-4ff3-863d-6dbd6234a583}");
const PC_ICE_CID = Components.ID("{02b9970c-433d-4cc2-923d-f7028ac66073}");
const PC_SESSION_CID = Components.ID("{1775081b-b62d-4954-8ffe-a067bbf508a7}");
const PC_MANAGER_CID = Components.ID("{7293e901-2be3-4c02-b4bd-cbef6fc24f78}");
const PC_STATS_CID = Components.ID("{7fe6e18b-0da3-4056-bf3b-440ef3809e06}");
// Global list of PeerConnection objects, so they can be cleaned up when
// a page is torn down. (Maps inner window ID to an array of PC objects).
function GlobalPCList() {
this._list = [];
this._networkdown = false; // XXX Need to query current state somehow
Services.obs.addObserver(this, "inner-window-destroyed", true);
Services.obs.addObserver(this, "profile-change-net-teardown", true);
Services.obs.addObserver(this, "network:offline-about-to-go-offline", true);
Services.obs.addObserver(this, "network:offline-status-changed", true);
}
GlobalPCList.prototype = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
Ci.nsISupportsWeakReference,
Ci.IPeerConnectionManager]),
classID: PC_MANAGER_CID,
_xpcom_factory: {
createInstance: function(outer, iid) {
if (outer) {
throw Cr.NS_ERROR_NO_AGGREGATION;
}
return _globalPCList.QueryInterface(iid);
}
},
addPC: function(pc) {
let winID = pc._winID;
if (this._list[winID]) {
this._list[winID].push(Cu.getWeakReference(pc));
} else {
this._list[winID] = [Cu.getWeakReference(pc)];
}
this.removeNullRefs(winID);
},
removeNullRefs: function(winID) {
if (this._list === undefined || this._list[winID] === undefined) {
return;
}
this._list[winID] = this._list[winID].filter(
function (e,i,a) { return e.get() !== null; });
},
hasActivePeerConnection: function(winID) {
this.removeNullRefs(winID);
return this._list[winID] ? true : false;
},
observe: function(subject, topic, data) {
if (topic == "inner-window-destroyed") {
let winID = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
if (this._list[winID]) {
this._list[winID].forEach(function(pcref) {
let pc = pcref.get();
if (pc !== null) {
pc._pc.close();
delete pc._observer;
pc._pc = null;
}
});
delete this._list[winID];
}
} else if (topic == "profile-change-net-teardown" ||
topic == "network:offline-about-to-go-offline") {
// Delete all peerconnections on shutdown - mostly synchronously (we
// need them to be done deleting transports and streams before we
// return)! All socket operations must be queued to STS thread
// before we return to here.
// Also kill them if "Work Offline" is selected - more can be created
// while offline, but attempts to connect them should fail.
let array;
while ((array = this._list.pop()) != undefined) {
array.forEach(function(pcref) {
let pc = pcref.get();
if (pc !== null) {
pc._pc.close();
delete pc._observer;
pc._pc = null;
}
});
};
this._networkdown = true;
}
else if (topic == "network:offline-status-changed") {
if (data == "offline") {
// this._list shold be empty here
this._networkdown = true;
} else if (data == "online") {
this._networkdown = false;
}
}
},
};
let _globalPCList = new GlobalPCList();
function RTCIceCandidate() {
this.candidate = this.sdpMid = this.sdpMLineIndex = null;
}
RTCIceCandidate.prototype = {
classDescription: "mozRTCIceCandidate",
classID: PC_ICE_CID,
contractID: PC_ICE_CONTRACT,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsIDOMGlobalPropertyInitializer]),
init: function(win) { this._win = win; },
__init: function(dict) {
this.candidate = dict.candidate;
this.sdpMid = dict.sdpMid;
this.sdpMLineIndex = ("sdpMLineIndex" in dict)? dict.sdpMLineIndex : null;
}
};
function RTCSessionDescription() {
this.type = this.sdp = null;
}
RTCSessionDescription.prototype = {
classDescription: "mozRTCSessionDescription",
classID: PC_SESSION_CID,
contractID: PC_SESSION_CONTRACT,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsIDOMGlobalPropertyInitializer]),
init: function(win) { this._win = win; },
__init: function(dict) {
this.type = dict.type;
this.sdp = dict.sdp;
}
};
function RTCStatsReport(win, report) {
this._win = win;
this.report = report;
}
RTCStatsReport.prototype = {
classDescription: "RTCStatsReport",
classID: PC_STATS_CID,
contractID: PC_STATS_CONTRACT,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsIDOMGlobalPropertyInitializer]),
forEach: function(cb, thisArg) {
for (var key in this.report) {
if (this.report.hasOwnProperty(key)) {
cb.call(thisArg || this, this.get(key), key, this.report);
}
}
},
get: function(key) {
function publify(win, obj) {
let props = {};
for (let k in obj) {
props[k] = {enumerable:true, configurable:true, writable:true, value:obj[k]};
}
let pubobj = Cu.createObjectIn(win);
Object.defineProperties(pubobj, props);
Cu.makeObjectPropsNormal(pubobj);
return pubobj;
}
// Return a content object rather than a wrapped chrome one.
return publify(this._win, this.report[key]);
},
has: function(key) {
return this.report[key] !== undefined;
}
};
function RTCPeerConnection() {
this._queue = [];
this._pc = null;
this._observer = null;
this._closed = false;
this._onCreateOfferSuccess = null;
this._onCreateOfferFailure = null;
this._onCreateAnswerSuccess = null;
this._onCreateAnswerFailure = null;
this._onGetStatsSuccess = null;
this._onGetStatsFailure = null;
this._pendingType = null;
this._localType = null;
this._remoteType = null;
this._trickleIce = false;
/**
* Everytime we get a request from content, we put it in the queue. If
* there are no pending operations though, we will execute it immediately.
* In PeerConnectionObserver, whenever we are notified that an operation
* has finished, we will check the queue for the next operation and execute
* if neccesary. The _pending flag indicates whether an operation is currently
* in progress.
*/
this._pending = false;
// States
this._iceGatheringState = this._iceConnectionState = "new";
}
RTCPeerConnection.prototype = {
classDescription: "mozRTCPeerConnection",
classID: PC_CID,
contractID: PC_CONTRACT,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsIDOMGlobalPropertyInitializer]),
init: function(win) { this._win = win; },
__init: function(rtcConfig) {
this._trickleIce = Services.prefs.getBoolPref("media.peerconnection.trickle_ice");
if (!rtcConfig.iceServers ||
!Services.prefs.getBoolPref("media.peerconnection.use_document_iceservers")) {
rtcConfig = {iceServers:
JSON.parse(Services.prefs.getCharPref("media.peerconnection.default_iceservers"))};
}
this._mustValidateRTCConfiguration(rtcConfig,
"RTCPeerConnection constructor passed invalid RTCConfiguration");
if (_globalPCList._networkdown) {
throw new this._win.DOMError("",
"Can't create RTCPeerConnections when the network is down");
}
this.makeGetterSetterEH("onaddstream");
this.makeGetterSetterEH("onicecandidate");
this.makeGetterSetterEH("onnegotiationneeded");
this.makeGetterSetterEH("onsignalingstatechange");
this.makeGetterSetterEH("onremovestream");
this.makeGetterSetterEH("ondatachannel");
this.makeGetterSetterEH("onconnection");
this.makeGetterSetterEH("onclosedconnection");
this.makeGetterSetterEH("oniceconnectionstatechange");
this._pc = new this._win.PeerConnectionImpl();
this.__DOM_IMPL__._innerObject = this;
this._observer = new this._win.PeerConnectionObserver(this.__DOM_IMPL__);
this._winID = this._win.QueryInterface(Ci.nsIInterfaceRequestor)
.getInterface(Ci.nsIDOMWindowUtils).currentInnerWindowID;
// Add a reference to the PeerConnection to global list (before init).
_globalPCList.addPC(this);
this._queueOrRun({
func: this._initialize,
args: [rtcConfig],
// If not trickling, suppress start.
wait: !this._trickleIce
});
},
_initialize: function(rtcConfig) {
this._getPC().initialize(this._observer, this._win, rtcConfig,
Services.tm.currentThread);
},
_getPC: function() {
if (!this._pc) {
throw new this._win.DOMError("",
"RTCPeerConnection is gone (did you enter Offline mode?)");
}
return this._pc;
},
/**
* Add a function to the queue or run it immediately if the queue is empty.
* Argument is an object with the func, args and wait properties; wait should
* be set to true if the function has a success/error callback that will
* call _executeNext, false if it doesn't have a callback.
*/
_queueOrRun: function(obj) {
this._checkClosed();
if (!this._pending) {
if (obj.type !== undefined) {
this._pendingType = obj.type;
}
obj.func.apply(this, obj.args);
if (obj.wait) {
this._pending = true;
}
} else {
this._queue.push(obj);
}
},
// Pick the next item from the queue and run it.
_executeNext: function() {
if (this._queue.length) {
let obj = this._queue.shift();
if (obj.type !== undefined) {
this._pendingType = obj.type;
}
obj.func.apply(this, obj.args);
if (!obj.wait) {
this._executeNext();
}
} else {
this._pending = false;
}
},
/**
* An RTCConfiguration looks like this:
*
* { "iceServers": [ { url:"stun:stun.example.org" },
* { url:"turn:turn.example.org",
* username:"jib", credential:"mypass"} ] }
*
* WebIDL normalizes structure for us, so we test well-formed stun/turn urls,
* but not validity of servers themselves, before passing along to C++.
* ErrorMsg is passed in to detail which array-entry failed, if any.
*/
_mustValidateRTCConfiguration: function(rtcConfig, errorMsg) {
var errorCtor = this._win.DOMError;
function nicerNewURI(uriStr, errorMsg) {
let ios = Cc['@mozilla.org/network/io-service;1'].getService(Ci.nsIIOService);
try {
return ios.newURI(uriStr, null, null);
} catch (e if (e.result == Cr.NS_ERROR_MALFORMED_URI)) {
throw new errorCtor("", errorMsg + " - malformed URI: " + uriStr);
}
}
function mustValidateServer(server) {
if (!server.url) {
throw new errorCtor("", errorMsg + " - missing url");
}
let url = nicerNewURI(server.url, errorMsg);
if (url.scheme in { turn:1, turns:1 }) {
if (!server.username) {
throw new errorCtor("", errorMsg + " - missing username: " + server.url);
}
if (!server.credential) {
throw new errorCtor("", errorMsg + " - missing credential: " +
server.url);
}
}
else if (!(url.scheme in { stun:1, stuns:1 })) {
throw new errorCtor("", errorMsg + " - improper scheme: " + url.scheme);
}
}
if (rtcConfig.iceServers) {
let len = rtcConfig.iceServers.length;
for (let i=0; i < len; i++) {
mustValidateServer (rtcConfig.iceServers[i], errorMsg);
}
}
},
/**
* MediaConstraints look like this:
*
* {
* mandatory: {"OfferToReceiveAudio": true, "OfferToReceiveVideo": true },
* optional: [{"VoiceActivityDetection": true}, {"FooBar": 10}]
* }
*
* WebIDL normalizes the top structure for us, but the mandatory constraints
* member comes in as a raw object so we can detect unknown constraints.
* We compare its members against ones we support, and fail if not found.
*/
_mustValidateConstraints: function(constraints, errorMsg) {
if (constraints.mandatory) {
let supported;
try {
// Passing the raw constraints.mandatory here validates its structure
supported = this._observer.getSupportedConstraints(constraints.mandatory);
} catch (e) {
throw new this._win.DOMError("", errorMsg + " - " + e.message);
}
for (let constraint of Object.keys(constraints.mandatory)) {
if (!(constraint in supported)) {
throw new this._win.DOMError("",
errorMsg + " - unknown mandatory constraint: " + constraint);
}
}
}
if (constraints.optional) {
let len = constraints.optional.length;
for (let i = 0; i < len; i++) {
let constraints_per_entry = 0;
for (let constraint in Object.keys(constraints.optional[i])) {
if (constraints_per_entry) {
throw new this._win.DOMError("", errorMsg +
" - optional constraint must be single key/value pair");
}
constraints_per_entry += 1;
}
}
}
},
// Ideally, this should be of the form _checkState(state),
// where the state is taken from an enumeration containing
// the valid peer connection states defined in the WebRTC
// spec. See Bug 831756.
_checkClosed: function() {
if (this._closed) {
throw new this._win.DOMError("", "Peer connection is closed");
}
},
dispatchEvent: function(event) {
this.__DOM_IMPL__.dispatchEvent(event);
},
// Log error message to web console and window.onerror, if present.
reportError: function(msg, file, line) {
this.reportMsg(msg, file, line, Ci.nsIScriptError.exceptionFlag);
},
reportWarning: function(msg, file, line) {
this.reportMsg(msg, file, line, Ci.nsIScriptError.warningFlag);
},
reportMsg: function(msg, file, line, flag) {
let scriptErrorClass = Cc["@mozilla.org/scripterror;1"];
let scriptError = scriptErrorClass.createInstance(Ci.nsIScriptError);
scriptError.initWithWindowID(msg, file, null, line, 0, flag,
"content javascript", this._winID);
let console = Cc["@mozilla.org/consoleservice;1"].
getService(Ci.nsIConsoleService);
console.logMessage(scriptError);
if (flag != Ci.nsIScriptError.warningFlag) {
// Safely call onerror directly if present (necessary for testing)
try {
if (typeof this._win.onerror === "function") {
this._win.onerror(msg, file, line);
}
} catch(e) {
// If onerror itself throws, service it.
try {
let scriptError = scriptErrorClass.createInstance(Ci.nsIScriptError);
scriptError.initWithWindowID(e.message, e.fileName, null, e.lineNumber,
0, Ci.nsIScriptError.exceptionFlag,
"content javascript",
this._winID);
console.logMessage(scriptError);
} catch(e) {}
}
}
},
getEH: function(type) {
return this.__DOM_IMPL__.getEventHandler(type);
},
setEH: function(type, handler) {
this.__DOM_IMPL__.setEventHandler(type, handler);
},
makeGetterSetterEH: function(name) {
Object.defineProperty(this, name,
{
get:function() { return this.getEH(name); },
set:function(h) { return this.setEH(name, h); }
});
},
createOffer: function(onSuccess, onError, constraints) {
if (!constraints) {
constraints = {};
}
this._mustValidateConstraints(constraints, "createOffer passed invalid constraints");
this._onCreateOfferSuccess = onSuccess;
this._onCreateOfferFailure = onError;
this._queueOrRun({ func: this._createOffer, args: [constraints], wait: true });
},
_createOffer: function(constraints) {
this._getPC().createOffer(constraints);
},
_createAnswer: function(onSuccess, onError, constraints, provisional) {
this._onCreateAnswerSuccess = onSuccess;
this._onCreateAnswerFailure = onError;
if (!this.remoteDescription) {
this._observer.onCreateAnswerError(Ci.IPeerConnection.kInvalidState,
"setRemoteDescription not called");
return;
}
if (this.remoteDescription.type != "offer") {
this._observer.onCreateAnswerError(Ci.IPeerConnection.kInvalidState,
"No outstanding offer");
return;
}
// TODO: Implement provisional answer.
this._getPC().createAnswer(constraints);
},
createAnswer: function(onSuccess, onError, constraints, provisional) {
if (!constraints) {
constraints = {};
}
this._mustValidateConstraints(constraints, "createAnswer passed invalid constraints");
if (!provisional) {
provisional = false;
}
this._queueOrRun({
func: this._createAnswer,
args: [onSuccess, onError, constraints, provisional],
wait: true
});
},
setLocalDescription: function(desc, onSuccess, onError) {
// TODO -- if we have two setLocalDescriptions in the
// queue,this code overwrites the callbacks for the first
// one with the callbacks for the second one. See Bug 831759.
this._onSetLocalDescriptionSuccess = onSuccess;
this._onSetLocalDescriptionFailure = onError;
let type;
switch (desc.type) {
case "offer":
type = Ci.IPeerConnection.kActionOffer;
break;
case "answer":
type = Ci.IPeerConnection.kActionAnswer;
break;
case "pranswer":
throw new this._win.DOMError("", "pranswer not yet implemented");
default:
throw new this._win.DOMError("",
"Invalid type " + desc.type + " provided to setLocalDescription");
}
this._queueOrRun({
func: this._setLocalDescription,
args: [type, desc.sdp],
wait: true,
type: desc.type
});
},
_setLocalDescription: function(type, sdp) {
this._getPC().setLocalDescription(type, sdp);
},
setRemoteDescription: function(desc, onSuccess, onError) {
// TODO -- if we have two setRemoteDescriptions in the
// queue, this code overwrites the callbacks for the first
// one with the callbacks for the second one. See Bug 831759.
this._onSetRemoteDescriptionSuccess = onSuccess;
this._onSetRemoteDescriptionFailure = onError;
let type;
switch (desc.type) {
case "offer":
type = Ci.IPeerConnection.kActionOffer;
break;
case "answer":
type = Ci.IPeerConnection.kActionAnswer;
break;
case "pranswer":
throw new this._win.DOMError("", "pranswer not yet implemented");
default:
throw new this._win.DOMError("",
"Invalid type " + desc.type + " provided to setRemoteDescription");
}
this._queueOrRun({
func: this._setRemoteDescription,
args: [type, desc.sdp],
wait: true,
type: desc.type
});
},
_setRemoteDescription: function(type, sdp) {
this._getPC().setRemoteDescription(type, sdp);
},
updateIce: function(config, constraints) {
throw new this._win.DOMError("", "updateIce not yet implemented");
},
addIceCandidate: function(cand, onSuccess, onError) {
if (!cand.candidate && !cand.sdpMLineIndex) {
throw new this._win.DOMError("",
"Invalid candidate passed to addIceCandidate!");
}
this._onAddIceCandidateSuccess = onSuccess || null;
this._onAddIceCandidateError = onError || null;
this._queueOrRun({ func: this._addIceCandidate, args: [cand], wait: true });
},
_addIceCandidate: function(cand) {
this._getPC().addIceCandidate(cand.candidate, cand.sdpMid || "",
(cand.sdpMLineIndex === null)? 0 :
cand.sdpMLineIndex + 1);
},
addStream: function(stream, constraints) {
if (stream.currentTime === undefined) {
throw new this._win.DOMError("", "Invalid stream passed to addStream!");
}
// TODO: Implement constraints.
this._queueOrRun({ func: this._addStream, args: [stream], wait: false });
},
_addStream: function(stream) {
this._getPC().addStream(stream);
},
removeStream: function(stream) {
//Bug 844295: Not implementing this functionality.
throw new this._win.DOMError("", "removeStream not yet implemented");
},
getStreamById: function(id) {
throw new this._win.DOMError("", "getStreamById not yet implemented");
},
close: function() {
this._queueOrRun({ func: this._close, args: [false], wait: false });
this._closed = true;
this.changeIceConnectionState("closed");
},
_close: function() {
this._getPC().close();
},
getLocalStreams: function() {
this._checkClosed();
return this._getPC().getLocalStreams();
},
getRemoteStreams: function() {
this._checkClosed();
return this._getPC().getRemoteStreams();
},
get localDescription() {
this._checkClosed();
let sdp = this._getPC().localDescription;
if (sdp.length == 0) {
return null;
}
return new this._win.mozRTCSessionDescription({ type: this._localType,
sdp: sdp });
},
get remoteDescription() {
this._checkClosed();
let sdp = this._getPC().remoteDescription;
if (sdp.length == 0) {
return null;
}
return new this._win.mozRTCSessionDescription({ type: this._remoteType,
sdp: sdp });
},
get iceGatheringState() { return this._iceGatheringState; },
get iceConnectionState() { return this._iceConnectionState; },
get signalingState() {
// checking for our local pc closed indication
// before invoking the pc methods.
if(this._closed) {
return "closed";
}
return {
"SignalingInvalid": "",
"SignalingStable": "stable",
"SignalingHaveLocalOffer": "have-local-offer",
"SignalingHaveRemoteOffer": "have-remote-offer",
"SignalingHaveLocalPranswer": "have-local-pranswer",
"SignalingHaveRemotePranswer": "have-remote-pranswer",
"SignalingClosed": "closed"
}[this._getPC().signalingState];
},
changeIceGatheringState: function(state) {
this._iceGatheringState = state;
},
changeIceConnectionState: function(state) {
this._iceConnectionState = state;
this.dispatchEvent(new this._win.Event("iceconnectionstatechange"));
},
getStats: function(selector, onSuccess, onError) {
this._queueOrRun({
func: this._getStats,
args: [selector, onSuccess, onError, false],
wait: true
});
},
getStatsInternal: function(selector, onSuccess, onError) {
this._queueOrRun({
func: this._getStats,
args: [selector, onSuccess, onError, true],
wait: true
});
},
_getStats: function(selector, onSuccess, onError, internal) {
this._onGetStatsSuccess = onSuccess;
this._onGetStatsFailure = onError;
this._getPC().getStats(selector, internal);
},
createDataChannel: function(label, dict) {
this._checkClosed();
if (dict == undefined) {
dict = {};
}
if (dict.maxRetransmitNum != undefined) {
dict.maxRetransmits = dict.maxRetransmitNum;
this.reportWarning("Deprecated RTCDataChannelInit dictionary entry maxRetransmitNum used!", null, 0);
}
if (dict.outOfOrderAllowed != undefined) {
dict.ordered = !dict.outOfOrderAllowed; // the meaning is swapped with the name change
this.reportWarning("Deprecated RTCDataChannelInit dictionary entry outOfOrderAllowed used!", null, 0);
}
if (dict.preset != undefined) {
dict.negotiated = dict.preset;
this.reportWarning("Deprecated RTCDataChannelInit dictionary entry preset used!", null, 0);
}
if (dict.stream != undefined) {
dict.id = dict.stream;
this.reportWarning("Deprecated RTCDataChannelInit dictionary entry stream used!", null, 0);
}
if (dict.maxRetransmitTime != undefined &&
dict.maxRetransmits != undefined) {
throw new this._win.DOMError("",
"Both maxRetransmitTime and maxRetransmits cannot be provided");
}
let protocol;
if (dict.protocol == undefined) {
protocol = "";
} else {
protocol = dict.protocol;
}
// Must determine the type where we still know if entries are undefined.
let type;
if (dict.maxRetransmitTime != undefined) {
type = Ci.IPeerConnection.kDataChannelPartialReliableTimed;
} else if (dict.maxRetransmits != undefined) {
type = Ci.IPeerConnection.kDataChannelPartialReliableRexmit;
} else {
type = Ci.IPeerConnection.kDataChannelReliable;
}
// Synchronous since it doesn't block.
let channel = this._getPC().createDataChannel(
label, protocol, type, !dict.ordered, dict.maxRetransmitTime,
dict.maxRetransmits, dict.negotiated ? true : false,
dict.id != undefined ? dict.id : 0xFFFF
);
return channel;
},
connectDataConnection: function(localport, remoteport, numstreams) {
if (numstreams == undefined || numstreams <= 0) {
numstreams = 16;
}
this._queueOrRun({
func: this._connectDataConnection,
args: [localport, remoteport, numstreams],
wait: false
});
},
_connectDataConnection: function(localport, remoteport, numstreams) {
this._getPC().connectDataConnection(localport, remoteport, numstreams);
}
};
function RTCError(code, message) {
this.name = this.reasonName[Math.min(code, this.reasonName.length - 1)];
this.message = (typeof message === "string")? message : this.name;
this.__exposedProps__ = { name: "rw", message: "rw" };
}
RTCError.prototype = {
// These strings must match those defined in the WebRTC spec.
reasonName: [
"NO_ERROR", // Should never happen -- only used for testing
"INVALID_CONSTRAINTS_TYPE",
"INVALID_CANDIDATE_TYPE",
"INVALID_MEDIASTREAM_TRACK",
"INVALID_STATE",
"INVALID_SESSION_DESCRIPTION",
"INCOMPATIBLE_SESSION_DESCRIPTION",
"INCOMPATIBLE_CONSTRAINTS",
"INCOMPATIBLE_MEDIASTREAMTRACK",
"INTERNAL_ERROR"
]
};
// This is a separate object because we don't want to expose it to DOM.
function PeerConnectionObserver() {
this._dompc = null;
this._guard = new WeakReferent(this);
}
PeerConnectionObserver.prototype = {
classDescription: "PeerConnectionObserver",
classID: PC_OBS_CID,
contractID: PC_OBS_CONTRACT,
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsIDOMGlobalPropertyInitializer]),
init: function(win) { this._win = win; },
__init: function(dompc) {
this._dompc = dompc._innerObject;
},
dispatchEvent: function(event) {
this._dompc.dispatchEvent(event);
},
callCB: function(callback, arg) {
if (callback) {
try {
callback(arg);
} catch(e) {
// A content script (user-provided) callback threw an error. We don't
// want this to take down peerconnection, but we still want the user
// to see it, so we catch it, report it, and move on.
this._dompc.reportError(e.message, e.fileName, e.lineNumber);
}
}
},
onCreateOfferSuccess: function(sdp) {
this.callCB(this._dompc._onCreateOfferSuccess,
new this._dompc._win.mozRTCSessionDescription({ type: "offer",
sdp: sdp }));
this._dompc._executeNext();
},
onCreateOfferError: function(code, message) {
this.callCB(this._dompc._onCreateOfferFailure, new RTCError(code, message));
this._dompc._executeNext();
},
onCreateAnswerSuccess: function(sdp) {
this.callCB (this._dompc._onCreateAnswerSuccess,
new this._dompc._win.mozRTCSessionDescription({ type: "answer",
sdp: sdp }));
this._dompc._executeNext();
},
onCreateAnswerError: function(code, message) {
this.callCB(this._dompc._onCreateAnswerFailure, new RTCError(code, message));
this._dompc._executeNext();
},
onSetLocalDescriptionSuccess: function() {
this._dompc._localType = this._dompc._pendingType;
this._dompc._pendingType = null;
this.callCB(this._dompc._onSetLocalDescriptionSuccess);
if (this._dompc._iceGatheringState == "complete") {
// If we are not trickling or we completed gathering prior
// to setLocal, then trigger a call of onicecandidate here.
this.foundIceCandidate(null);
}
this._dompc._executeNext();
},
onSetRemoteDescriptionSuccess: function() {
this._dompc._remoteType = this._dompc._pendingType;
this._dompc._pendingType = null;
this.callCB(this._dompc._onSetRemoteDescriptionSuccess);
this._dompc._executeNext();
},
onSetLocalDescriptionError: function(code, message) {
this._dompc._pendingType = null;
this.callCB(this._dompc._onSetLocalDescriptionFailure,
new RTCError(code, message));
this._dompc._executeNext();
},
onSetRemoteDescriptionError: function(code, message) {
this._dompc._pendingType = null;
this.callCB(this._dompc._onSetRemoteDescriptionFailure,
new RTCError(code, message));
this._dompc._executeNext();
},
onAddIceCandidateSuccess: function() {
this._dompc._pendingType = null;
this.callCB(this._dompc._onAddIceCandidateSuccess);
this._dompc._executeNext();
},
onAddIceCandidateError: function(code, message) {
this._dompc._pendingType = null;
this.callCB(this._dompc._onAddIceCandidateError, new RTCError(code, message));
this._dompc._executeNext();
},
onIceCandidate: function(level, mid, candidate) {
this.foundIceCandidate(new this._dompc._win.mozRTCIceCandidate(
{
candidate: candidate,
sdpMid: mid,
sdpMLineIndex: level - 1
}
));
},
// This method is primarily responsible for updating two attributes:
// iceGatheringState and iceConnectionState. These states are defined
// in the WebRTC specification as follows:
//
// iceGatheringState:
// ------------------
// new The object was just created, and no networking has occurred
// yet.
//
// gathering The ICE engine is in the process of gathering candidates for
// this RTCPeerConnection.
//
// complete The ICE engine has completed gathering. Events such as adding
// a new interface or a new TURN server will cause the state to
// go back to gathering.
//
// iceConnectionState:
// -------------------
// new The ICE Agent is gathering addresses and/or waiting for
// remote candidates to be supplied.
//
// checking The ICE Agent has received remote candidates on at least
// one component, and is checking candidate pairs but has not
// yet found a connection. In addition to checking, it may
// also still be gathering.
//
// connected The ICE Agent has found a usable connection for all
// components but is still checking other candidate pairs to
// see if there is a better connection. It may also still be
// gathering.
//
// completed The ICE Agent has finished gathering and checking and found
// a connection for all components. Open issue: it is not
// clear how the non controlling ICE side knows it is in the
// state.
//
// failed The ICE Agent is finished checking all candidate pairs and
// failed to find a connection for at least one component.
// Connections may have been found for some components.
//
// disconnected Liveness checks have failed for one or more components.
// This is more aggressive than failed, and may trigger
// intermittently (and resolve itself without action) on a
// flaky network.
//
// closed The ICE Agent has shut down and is no longer responding to
// STUN requests.
handleIceStateChanges: function(iceState) {
var histogram = Services.telemetry.getHistogramById("WEBRTC_ICE_SUCCESS_RATE");
const STATE_MAP = {
IceGathering:
{ gathering: "gathering" },
IceWaiting:
{ connection: "new", gathering: "complete" },
IceChecking:
{ connection: "checking" },
IceConnected:
{ connection: "connected", success: true },
IceFailed:
{ connection: "failed", success: false }
};
// These are all the allowed inputs.
let transitions = STATE_MAP[iceState];
if ("connection" in transitions) {
this._dompc.changeIceConnectionState(transitions.connection);
}
if ("gathering" in transitions) {
this._dompc.changeIceGatheringState(transitions.gathering);
}
if ("success" in transitions) {
histogram.add(transitions.success);
}
if (iceState == "IceWaiting") {
if (!this._dompc._trickleIce) {
// If we are not trickling, then the queue is in a pending state
// waiting for ICE gathering and executeNext frees it
this._dompc._executeNext();
}
else if (this._dompc.localDescription) {
// If we are trickling but we have already done setLocal,
// then we need to send a final foundIceCandidate(null) to indicate
// that we are done gathering.
this.foundIceCandidate(null);
}
}
},
onStateChange: function(state) {
switch (state) {
case "SignalingState":
this.callCB(this._dompc.onsignalingstatechange,
this._dompc.signalingState);
break;
case "IceState":
this.handleIceStateChanges(this._dompc._pc.iceState);
break;
case "SdpState":
// No-op
break;
case "ReadyState":
// No-op
break;
case "SipccState":
// No-op
break;
default:
this._dompc.reportWarning("Unhandled state type: " + state, null, 0);
break;
}
},
onGetStatsSuccess: function(dict) {
function appendStats(stats, report) {
if (stats) {
stats.forEach(function(stat) {
report[stat.id] = stat;
});
}
}
let report = {};
appendStats(dict.rtpStreamStats, report);
appendStats(dict.inboundRTPStreamStats, report);
appendStats(dict.outboundRTPStreamStats, report);
appendStats(dict.mediaStreamTrackStats, report);
appendStats(dict.mediaStreamStats, report);
appendStats(dict.transportStats, report);
appendStats(dict.iceComponentStats, report);
appendStats(dict.iceCandidatePairStats, report);
appendStats(dict.iceCandidateStats, report);
appendStats(dict.codecStats, report);
this.callCB(this._dompc._onGetStatsSuccess,
this._dompc._win.RTCStatsReport._create(this._dompc._win,
new RTCStatsReport(this._dompc._win,
report)));
this._dompc._executeNext();
},
onGetStatsError: function(code, message) {
this.callCB(this._dompc._onGetStatsFailure, new RTCError(code, message));
this._dompc._executeNext();
},
onAddStream: function(stream) {
this.dispatchEvent(new this._dompc._win.MediaStreamEvent("addstream",
{ stream: stream }));
},
onRemoveStream: function(stream, type) {
this.dispatchEvent(new this._dompc._win.MediaStreamEvent("removestream",
{ stream: stream }));
},
foundIceCandidate: function(cand) {
this.dispatchEvent(new this._dompc._win.RTCPeerConnectionIceEvent("icecandidate",
{ candidate: cand } ));
},
notifyDataChannel: function(channel) {
this.dispatchEvent(new this._dompc._win.RTCDataChannelEvent("datachannel",
{ channel: channel }));
},
notifyConnection: function() {
this.dispatchEvent(new this._dompc._win.Event("connection"));
},
notifyClosedConnection: function() {
this.dispatchEvent(new this._dompc._win.Event("closedconnection"));
},
getSupportedConstraints: function(dict) {
return dict;
},
get weakReferent() {
return this._guard;
}
};
// A PeerConnectionObserver member that c++ can do weak references on
function WeakReferent(parent) {
this._parent = parent; // prevents parent from going away without us
}
WeakReferent.prototype = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsISupports,
Ci.nsISupportsWeakReference]),
};
this.NSGetFactory = XPCOMUtils.generateNSGetFactory(
[GlobalPCList, RTCIceCandidate, RTCSessionDescription, RTCPeerConnection,
RTCStatsReport, PeerConnectionObserver]
);
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