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main.js
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187 lines (163 loc) · 5.33 KB
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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree.
*/
'use strict';
var localConnection;
var remoteConnection;
var sendChannel;
var receiveChannel;
var pcConstraint;
var dataConstraint;
var dataChannelSend = document.querySelector('textarea#dataChannelSend');
var dataChannelReceive = document.querySelector('textarea#dataChannelReceive');
var startButton = document.querySelector('button#startButton');
var sendButton = document.querySelector('button#sendButton');
var closeButton = document.querySelector('button#closeButton');
startButton.onclick = createConnection;
sendButton.onclick = sendData;
closeButton.onclick = closeDataChannels;
function enableStartButton() {
startButton.disabled = false;
}
function disableSendButton() {
sendButton.disabled = true;
}
function createConnection() {
dataChannelSend.placeholder = '';
var servers = null;
pcConstraint = null;
dataConstraint = null;
trace('Using SCTP based data channels');
// SCTP is supported from Chrome 31 and is supported in FF.
// No need to pass DTLS constraint as it is on by default in Chrome 31.
// For SCTP, reliable and ordered is true by default.
// Add localConnection to global scope to make it visible
// from the browser console.
window.localConnection = localConnection =
new RTCPeerConnection(servers, pcConstraint);
trace('Created local peer connection object localConnection');
sendChannel = localConnection.createDataChannel('sendDataChannel',
dataConstraint);
trace('Created send data channel');
localConnection.onicecandidate = iceCallback1;
sendChannel.onopen = onSendChannelStateChange;
sendChannel.onclose = onSendChannelStateChange;
// Add remoteConnection to global scope to make it visible
// from the browser console.
window.remoteConnection = remoteConnection =
new RTCPeerConnection(servers, pcConstraint);
trace('Created remote peer connection object remoteConnection');
remoteConnection.onicecandidate = iceCallback2;
remoteConnection.ondatachannel = receiveChannelCallback;
localConnection.createOffer().then(
gotDescription1,
onCreateSessionDescriptionError
);
startButton.disabled = true;
closeButton.disabled = false;
}
function onCreateSessionDescriptionError(error) {
trace('Failed to create session description: ' + error.toString());
}
function sendData() {
var data = dataChannelSend.value;
sendChannel.send(data);
trace('Sent Data: ' + data);
}
function closeDataChannels() {
trace('Closing data channels');
sendChannel.close();
trace('Closed data channel with label: ' + sendChannel.label);
receiveChannel.close();
trace('Closed data channel with label: ' + receiveChannel.label);
localConnection.close();
remoteConnection.close();
localConnection = null;
remoteConnection = null;
trace('Closed peer connections');
startButton.disabled = false;
sendButton.disabled = true;
closeButton.disabled = true;
dataChannelSend.value = '';
dataChannelReceive.value = '';
dataChannelSend.disabled = true;
disableSendButton();
enableStartButton();
}
function gotDescription1(desc) {
localConnection.setLocalDescription(desc);
trace('Offer from localConnection \n' + desc.sdp);
remoteConnection.setRemoteDescription(desc);
remoteConnection.createAnswer().then(
gotDescription2,
onCreateSessionDescriptionError
);
}
function gotDescription2(desc) {
remoteConnection.setLocalDescription(desc);
trace('Answer from remoteConnection \n' + desc.sdp);
localConnection.setRemoteDescription(desc);
}
function iceCallback1(event) {
trace('local ice callback');
if (event.candidate) {
remoteConnection.addIceCandidate(
event.candidate
).then(
onAddIceCandidateSuccess,
onAddIceCandidateError
);
trace('Local ICE candidate: \n' + event.candidate.candidate);
}
}
function iceCallback2(event) {
trace('remote ice callback');
if (event.candidate) {
localConnection.addIceCandidate(
event.candidate
).then(
onAddIceCandidateSuccess,
onAddIceCandidateError
);
trace('Remote ICE candidate: \n ' + event.candidate.candidate);
}
}
function onAddIceCandidateSuccess() {
trace('AddIceCandidate success.');
}
function onAddIceCandidateError(error) {
trace('Failed to add Ice Candidate: ' + error.toString());
}
function receiveChannelCallback(event) {
trace('Receive Channel Callback');
receiveChannel = event.channel;
receiveChannel.onmessage = onReceiveMessageCallback;
receiveChannel.onopen = onReceiveChannelStateChange;
receiveChannel.onclose = onReceiveChannelStateChange;
}
function onReceiveMessageCallback(event) {
trace('Received Message');
dataChannelReceive.value = event.data;
}
function onSendChannelStateChange() {
var readyState = sendChannel.readyState;
trace('Send channel state is: ' + readyState);
if (readyState === 'open') {
dataChannelSend.disabled = false;
dataChannelSend.focus();
sendButton.disabled = false;
closeButton.disabled = false;
} else {
dataChannelSend.disabled = true;
sendButton.disabled = true;
closeButton.disabled = true;
}
}
function onReceiveChannelStateChange() {
var readyState = receiveChannel.readyState;
trace('Receive channel state is: ' + readyState);
}