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webrtc-2.js
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194 lines (125 loc) · 7.5 KB
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function webrtc(type,socket,callback,sdp,ice){
console.log('--- webrtc ---');
socket.onmessage = onmsg;
var makingOffer = false;
var ignoreOffer = false;
var polite = (type==='inv');
console.log(name,polite);
var pc = new RTCPeerConnection();
pc.onicecandidate = onice;
pc.oniceconnectionstatechange = oniceconstatechange;
pc.onnegotiationneeded = onneg;
var dc = pc.createDataChannel('both',{negotiated:true,id:0});
dc.send.json = sendjson;
dc.onopen = onopen;
webrtc.rec = rec;
function process(){
sdp.forEach(json=>rec.sdp(json));
ice.forEach(json=>rec.ice(json));
}//process
var timer = setTimeout(restart,500);
function restart(){
console.log('***** restart *****');
//pc.restartIce();
webrtc(type,socket,callback,sdp,ice);
}//restart
function onopen(){
console.log(name,'dc.onopen');
clearTimeout(timer);
callback(pc,dc);
}//onopen
function sendjson(json){
var str = JSON.stringify(json);
dc.send(str);
return true;
}//sendjson
function onmsg(e){
var json = JSON.parse(e.data);
rec(json);
}//onnmsg
function rec(json){
var result = true;
switch(json.type){
case 'sdp' : rec.sdp(json); break;
case 'ice' : rec.ice(json); break;
default : result = false;
}//switch
return result;
}//rec
rec.sdp=async function(json){
log(name,'rec - sdp',json.sdp);
try {
var sdp = new RTCSessionDescription(json.sdp);
var offerCollision = (sdp.type==='offer' && (makingOffer || pc.signalingState!=='stable'));
ignoreOffer = (!polite && offerCollision);
if(ignoreOffer){
return;
}
if(offerCollision){
await Promise.all([
pc.setLocalDescription({type:'rollback'}),
pc.setRemoteDescription(sdp)
]);
} else {
await pc.setRemoteDescription(sdp);
}
if(sdp.type==='offer'){
await pc.setLocalDescription(await pc.createAnswer());
var sdp = pc.localDescription;
json = {type:'sdp',sdp};
socket.send.json(json);
}
}//try
catch(err){
console.log(name,err);
}
}//sdp
rec.ice=async function(json){
log(name,'rec - ice',json.ice);
try {
await pc.addIceCandidate(json.ice);
}
catch(err) {
if(!ignoreOffer){
console.log(name,err);
}
}
}//ice
function onice(e){
if(e.candidate){
log(name,'onice');
var candidate = e.candidate;
var ice = candidate;
var json = {type:'ice',ice};
socket.send.json(json);
}
}//onice
async function onneg(){
console.log(name,'negotiation needed');
try{
makingOffer = true;
const offer = await pc.createOffer();
if(pc.signalingState!=='stable'){
console.log(name,'exit');
return;
}
await pc.setLocalDescription(offer);
var sdp = pc.localDescription;
var json = {type:'sdp',sdp};
socket.send.json(json);
}
catch(e){
log(`ONN ${e}`);
}
finally {
makingOffer = false;
}
}//onneg
function oniceconstatechange(){
if(pc.iceConnectionState==='failed'){
console.log('iceconnectionstate failed');
pc.restartIce();
}
}//oniceconstatechange
process();
}//webrtc