mirror of
https://github.com/telemt/telemt.git
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WEB Carriers Safe-matrix Refactored
Co-Authored-By: brekotis <93345790+brekotis@users.noreply.github.com>
This commit is contained in:
Alexey
+88
-35
@@ -71,24 +71,29 @@ const DOCUMENT: &str = r##"<!doctype html>
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const bootstrap="__BOOTSTRAP__";
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const relayOrigin='https://__HOST__',carrierCapabilities='https,https-lanes,websocket,websocket-lanes';
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const negotiationEnabled=__NEGOTIATION_ENABLED__,candidateCount=__CANDIDATE_COUNT__,candidateDeadlines=[__CARRIER_DEADLINES__];
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const effectiveDeadlines=candidateDeadlines.slice(0,candidateCount-1).concat(candidateDeadlines[3]);
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let negotiatedCandidateCount=candidateCount,negotiatedFinalDeadline=candidateDeadlines[3],negotiatedFrozen=false;
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const batchLimit=__BATCH_LIMIT__,queueLimit=__QUEUE_LIMIT__,queueItemLimit=__QUEUE_ITEMS__;
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const laneQueueLimit=Math.min(queueLimit,8388608),laneItemLimit=Math.min(queueItemLimit,1024),closedLaneLimit=4096;
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const fragment=location.hash,androidNonce=/^#android=([A-Za-z0-9_-]{43})$/.exec(fragment)?.[1]||'';
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history.replaceState(null,'',location.pathname);
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let initialized=false,closed=false,port=null,sessionToken='',createStarted=false,socket=null,socketReady=false,carrier='';
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let initialized=false,closed=false,port=null,sessionToken='',cleanupToken='',createStarted=false,socket=null,socketReady=false,carrier='';
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let queuedBytes=0,queuedItems=0,upSequence=1,downCursor='0',upRunning=false,pollController=null;
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let helloFrame=null,welcomeSent=false,carrierAttempt=1,carrierFailure='',carrierCommitted=false;
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let negotiationStartedAt=0,carrierTimer=null,attemptController=null,attemptEpoch=1,candidateRunning=false,switching=false;
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let negotiationStartedAt=0,carrierTimer=null,attemptController=null,attemptEpoch=1,candidateRunning=false,switching=false,currentAttempt=null;
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const pending=[],upPending=[],lanes=new Map(),closedLanes=new Set(),closedLaneOrder=[];
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const status=state=>{if(port&&!closed)port.postMessage({t:'status',state})};
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const pause=milliseconds=>new Promise(resolve=>setTimeout(resolve,milliseconds));
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const pause=(milliseconds,signal)=>new Promise((resolve,reject)=>{
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if(signal&&signal.aborted){reject(new Error('request aborted'));return}
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const timer=setTimeout(done,milliseconds);function done(){if(signal)signal.removeEventListener('abort',abort);resolve()}
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function abort(){clearTimeout(timer);signal.removeEventListener('abort',abort);reject(new Error('request aborted'))}
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if(signal)signal.addEventListener('abort',abort,{once:true});
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});
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const socketURL=()=>relayOrigin.replace(/^https:/,'wss:')+'/api/v1/ws';
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const options=(method,token,body,headers,signal,keepalive)=>({
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method,body,signal,keepalive:!!keepalive,mode:'same-origin',credentials:'omit',cache:'no-store',redirect:'error',referrerPolicy:'no-referrer',
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headers:Object.assign(token?{Authorization:'Bearer '+token}:{},body?{'Content-Type':'application/octet-stream'}:{},headers||{})
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});
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const attemptHeaders=()=>negotiationEnabled?Object.assign({'X-Carrier-Capabilities':carrierCapabilities,'X-Carrier-Attempt':String(carrierAttempt)},carrierFailure?{'X-Carrier-Failure':carrierFailure}:{}):{};
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const attemptHeaders=(attempt,failure)=>negotiationEnabled?Object.assign({'X-Carrier-Capabilities':carrierCapabilities,'X-Carrier-Attempt':String(attempt)},failure?{'X-Carrier-Failure':failure}:{}):{};
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function reserve(data,lane){
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let buffered=socket?socket.bufferedAmount:0;for(const value of lanes.values())if(value.socket)buffered+=value.socket.bufferedAmount;
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if(!data.byteLength||data.byteLength>queueLimit-queuedBytes-buffered||queuedItems>=queueItemLimit)return false;
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@@ -165,12 +170,13 @@ function retryAfterMs(response){
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if(Number.isFinite(when)){const delta=when-Date.now();return delta>0?Math.min(delta,30000):0}
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return 0;
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}
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async function request(path,makeOptions){
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async function request(path,frozenOptions){
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let delay=250,attempt=0;const deadline=Date.now()+90000;
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while(true){
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const requestOptions=makeOptions(),controller=new AbortController(),external=requestOptions.signal;
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const controller=new AbortController(),external=frozenOptions.signal;
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if(closed||(external&&external.aborted))throw new Error('request aborted');
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const abort=()=>controller.abort();if(external)external.addEventListener('abort',abort,{once:true});
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requestOptions.signal=controller.signal;const timer=setTimeout(abort,90000);
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const requestOptions=Object.assign({},frozenOptions,{signal:controller.signal});const timer=setTimeout(abort,90000);
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let serviceUnavailable=false,wait=0;
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try{
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const response=await fetch(relayOrigin+path,requestOptions);
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@@ -181,16 +187,32 @@ async function request(path,makeOptions){
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if(++attempt===9)throw new Error('carrier retry limit reached');
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}finally{clearTimeout(timer);if(external)external.removeEventListener('abort',abort)}
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if(serviceUnavailable&&Date.now()>=deadline)throw new Error('carrier retry limit reached');
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status('reconnecting');await pause(wait||(delay+Math.floor(Math.random()*Math.max(1,delay/4))));
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status('reconnecting');await pause(wait||(delay+Math.floor(Math.random()*Math.max(1,delay/4))),external);
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if(closed||(external&&external.aborted))throw new Error('request aborted');
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if(!serviceUnavailable)delay=Math.min(delay*2,5000);
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}
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}
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function fail(){if(closed)return;status('failed');if(port)port.postMessage({t:'close'});close(true)}
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function knownCarrier(value){return value==='https'||value==='https-lanes'||value==='websocket'||value==='websocket-lanes'}
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function sessionEcho(response,expectedAttempt,states,exactAttempt){
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const selected=response.headers.get('X-Carrier-Mode')||'',echo=response.headers.get('X-Carrier-Attempt')||'';
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if(!knownCarrier(selected))throw new Error('invalid carrier mode');
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if(!negotiationEnabled){if(echo!=='')throw new Error('unexpected carrier attempt');return {selected,state:''}}
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const count=response.headers.get('X-Carrier-Candidate-Count')||'',deadline=response.headers.get('X-Carrier-Deadline')||'',state=response.headers.get('X-Carrier-State')||'';
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if(!/^[1-4]$/.test(count)||!/^[1-9]\d*$/.test(deadline)||!states.includes(state))throw new Error('invalid carrier state');
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const echoedAttempt=Number(echo),parsedCount=Number(count),parsedDeadline=Number(deadline);
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if(!Number.isInteger(echoedAttempt)||echoedAttempt<1||(exactAttempt?echoedAttempt!==expectedAttempt:echoedAttempt>expectedAttempt))throw new Error('invalid carrier attempt');
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if(parsedCount>candidateCount||parsedDeadline>candidateDeadlines[3])throw new Error('invalid carrier bounds');
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if(!negotiatedFrozen){negotiatedCandidateCount=parsedCount;negotiatedFinalDeadline=parsedDeadline;negotiatedFrozen=true}
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else if(parsedCount!==negotiatedCandidateCount||parsedDeadline!==negotiatedFinalDeadline)throw new Error('changed carrier bounds');
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if(echoedAttempt>negotiatedCandidateCount)throw new Error('carrier attempt exceeds candidates');
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return {selected,state};
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}
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function armCarrierDeadline(epoch){
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if(!negotiationStartedAt||epoch!==attemptEpoch)return;
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if(carrierTimer)clearTimeout(carrierTimer);
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const remaining=negotiationStartedAt+effectiveDeadlines[carrierAttempt-1]*1000-Date.now();
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const deadline=carrierAttempt>=negotiatedCandidateCount?negotiatedFinalDeadline:candidateDeadlines[carrierAttempt-1];
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const remaining=negotiationStartedAt+deadline*1000-Date.now();
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carrierTimer=setTimeout(()=>advanceCarrier('timeout',epoch),Math.max(0,remaining));
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}
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function resetCandidate(){
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@@ -198,21 +220,48 @@ function resetCandidate(){
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if(socket){const previous=socket;socket=null;previous.close()}socketReady=false;
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for(const lane of lanes.values()){if(lane.controller)lane.controller.abort();if(lane.socket)lane.socket.close()}
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lanes.clear();closedLanes.clear();closedLaneOrder.length=0;upPending.length=0;upSequence=1;downCursor='0';upRunning=false;
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sessionToken='';carrier='';candidateRunning=false;
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sessionToken='';carrier='';candidateRunning=false;currentAttempt=null;
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}
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function advanceConfirmed(reason,epoch){
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if(closed||carrierCommitted||epoch!==attemptEpoch)return;
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resetCandidate();
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if(carrierAttempt>=negotiatedCandidateCount||Date.now()>=negotiationStartedAt+negotiatedFinalDeadline*1000){switching=false;fail();return}
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carrierAttempt++;carrierFailure=reason;attemptEpoch++;const nextEpoch=attemptEpoch;switching=false;
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status('reconnecting');armCarrierDeadline(nextEpoch);createSession(nextEpoch);
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}
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function advanceCarrier(reason,epoch){
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if(closed||carrierCommitted||epoch!==attemptEpoch||switching)return;
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if(!negotiationEnabled){fail();return}
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switching=true;if(carrierTimer)clearTimeout(carrierTimer);carrierTimer=null;
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if(attemptController)attemptController.abort();attemptController=null;
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resetCandidate();
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if(carrierAttempt>=candidateCount||Date.now()>=negotiationStartedAt+effectiveDeadlines[effectiveDeadlines.length-1]*1000){switching=false;fail();return}
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carrierAttempt++;carrierFailure=reason;attemptEpoch++;const nextEpoch=attemptEpoch;switching=false;
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status('reconnecting');armCarrierDeadline(nextEpoch);createSession(nextEpoch);
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const snapshot=currentAttempt;if(attemptController)attemptController.abort();attemptController=null;
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if(!snapshot||snapshot.epoch!==epoch){switching=false;fail();return}
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resolveAttempt(reason,epoch,snapshot);
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}
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async function resolveAttempt(reason,epoch,snapshot){
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const controller=new AbortController();attemptController=controller;
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const remaining=negotiationStartedAt+negotiatedFinalDeadline*1000-Date.now();
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if(remaining<=0){switching=false;fail();return}
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const timer=setTimeout(()=>controller.abort(),remaining);
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try{
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const frozen=options('POST',bootstrap,snapshot.hello,attemptHeaders(snapshot.attempt,snapshot.failure),controller.signal);
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const response=await request('/api/v1/session',frozen);
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if(closed||epoch!==attemptEpoch){await response.arrayBuffer();return}
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if(response.status===409){sessionEcho(response,snapshot.attempt,['committed','healthy'],false);await response.arrayBuffer();switching=false;fail();return}
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if(response.status!==200){await response.arrayBuffer();switching=false;fail();return}
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const echo=sessionEcho(response,snapshot.attempt,['provisional','committed','healthy'],true);
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const token=response.headers.get('X-Session-Token')||'',cursor=response.headers.get('X-Down-Cursor')||'';
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if(!token||cursor!=='0'||(snapshot.selected&&echo.selected!==snapshot.selected))throw new Error('changed carrier replay');
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const welcome=await response.arrayBuffer();if(closed||epoch!==attemptEpoch)return;
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cleanupToken=token;
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if(!welcomeSent){welcomeSent=true;port.postMessage(welcome,[welcome])}
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if(echo.state!=='provisional'){switching=false;fail();return}
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advanceConfirmed(reason,epoch);
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}catch(error){if(!closed&&epoch===attemptEpoch){switching=false;fail()}}
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finally{clearTimeout(timer);if(attemptController===controller)attemptController=null}
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}
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function maybeStartCandidate(){
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let probe;try{probe=findProbe()}catch(error){fail();return}
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if(!probe||closed||carrierCommitted)return;
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if(negotiationEnabled&&!negotiationStartedAt){negotiationStartedAt=Date.now();armCarrierDeadline(attemptEpoch)}
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if(!sessionToken||candidateRunning)return;
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candidateRunning=true;const epoch=attemptEpoch;
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if(carrier==='https')probeHttp(probe,null,epoch);
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@@ -222,26 +271,28 @@ function maybeStartCandidate(){
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else advanceCarrier('protocol',epoch);
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}
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async function createSession(epoch){
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attemptController=new AbortController();
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const controller=new AbortController(),attempt=carrierAttempt,failure=carrierFailure;
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const snapshot={epoch,attempt,failure,hello:helloFrame,selected:''};currentAttempt=snapshot;attemptController=controller;
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try{
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status('connecting');
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const response=await request('/api/v1/session',()=>options('POST',bootstrap,helloFrame,attemptHeaders(),attemptController.signal));
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const frozen=options('POST',bootstrap,snapshot.hello,attemptHeaders(attempt,failure),controller.signal);
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const response=await request('/api/v1/session',frozen);
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if(closed||epoch!==attemptEpoch){await response.arrayBuffer();return}
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if(response.status!==200){await response.arrayBuffer();if(negotiationStartedAt)advanceCarrier('http',epoch);else fail();return}
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const selected=response.headers.get('X-Carrier-Mode')||'',echo=response.headers.get('X-Carrier-Attempt')||'';
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if(!knownCarrier(selected)||(negotiationEnabled?echo!==String(carrierAttempt):echo!=='')){await response.arrayBuffer();if(negotiationStartedAt)advanceCarrier('protocol',epoch);else fail();return}
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if(response.status===409){sessionEcho(response,attempt,['committed','healthy'],false);await response.arrayBuffer();fail();return}
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if(response.status!==200){await response.arrayBuffer();advanceCarrier('http',epoch);return}
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const echo=sessionEcho(response,attempt,['provisional'],true),selected=echo.selected;snapshot.selected=selected;
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const token=response.headers.get('X-Session-Token')||'',cursor=response.headers.get('X-Down-Cursor')||'';
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if(!token||cursor!=='0'){await response.arrayBuffer();if(negotiationStartedAt)advanceCarrier('protocol',epoch);else fail();return}
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if(!token||cursor!=='0'){await response.arrayBuffer();advanceCarrier('protocol',epoch);return}
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const welcome=await response.arrayBuffer();if(closed||epoch!==attemptEpoch)return;
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carrier=selected;sessionToken=token;downCursor=cursor;
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carrier=selected;sessionToken=token;cleanupToken=token;downCursor=cursor;
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if(!welcomeSent){welcomeSent=true;port.postMessage(welcome,[welcome])}
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maybeStartCandidate();
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}catch(error){if(closed||epoch!==attemptEpoch)return;if(negotiationStartedAt)advanceCarrier('network',epoch);else fail()}
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}catch(error){if(closed||epoch!==attemptEpoch)return;advanceCarrier('network',epoch)}
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}
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async function probeHttp(probe,laneID,epoch){
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try{
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const headers={'X-Up-Seq':'1'};if(laneID!==null)headers['X-Lane-ID']=String(laneID);
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const response=await request('/api/v1/up',()=>options('POST',sessionToken,probe.data,headers,attemptController.signal));
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const headers={'X-Up-Seq':'1'},token=sessionToken,controller=attemptController,body=probe.data;if(laneID!==null)headers['X-Lane-ID']=String(laneID);
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const response=await request('/api/v1/up',options('POST',token,body,headers,controller.signal));
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if(closed||epoch!==attemptEpoch){await response.arrayBuffer();return}
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if(response.status!==204){await response.arrayBuffer();advanceCarrier('http',epoch);return}
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if(response.headers.get('X-Up-Ack')!=='1'){advanceCarrier('protocol',epoch);return}
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@@ -251,11 +302,13 @@ async function probeHttp(probe,laneID,epoch){
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}
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function commitCarrier(probe,epoch){
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if(closed||carrierCommitted||epoch!==attemptEpoch)return;
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if(switching){fail();return}
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try{consumeProbe(probe)}catch(error){fail();return}
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carrierCommitted=true;candidateRunning=false;if(carrierTimer)clearTimeout(carrierTimer);carrierTimer=null;
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attemptController=null;currentAttempt=null;
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status('connected');
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if(carrier==='https')poll();
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else if(carrier==='https-lanes'){const control=ensureLane(0);pollLane(control);const lane=lanes.get(probe.id);if(lane&&!lane.polling)pollLane(lane)}
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else if(carrier==='https-lanes'){const lane=lanes.get(probe.id);if(lane&&!lane.polling)pollLane(lane)}
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for(const data of pending.splice(0)){release(data.byteLength,1,null);queueCarrier(data)}
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}
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function queueCarrier(data){
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@@ -271,7 +324,7 @@ async function runUp(){
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try{
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while(!closed&&sessionToken&&upPending.length){
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const batch=joinPending(upPending,null),sequence=String(upSequence);
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const response=await request('/api/v1/up',()=>options('POST',sessionToken,batch.body,{'X-Up-Seq':sequence}));
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const response=await request('/api/v1/up',options('POST',sessionToken,batch.body,{'X-Up-Seq':sequence}));
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if(response.status!==204||response.headers.get('X-Up-Ack')!==sequence)throw new Error('uplink rejected');
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release(batch.total,batch.count,null);port.postMessage({t:'traffic',up:batch.total,down:0});upSequence++;
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}
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@@ -279,7 +332,7 @@ async function runUp(){
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finally{upRunning=false;if(!closed&&sessionToken&&upPending.length)runUp()}
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}
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function openCandidateSocket(probe,laneID,epoch){
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const protocol=laneID===null?(negotiationEnabled?'tproxy-auto-v1.':'tproxy-v1.')+sessionToken:(negotiationEnabled?'tproxy-auto-lane-v1.':'tproxy-lane-v1.')+sessionToken+'.'+String(laneID);
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const token=sessionToken,protocol=laneID===null?(negotiationEnabled?'tproxy-auto-v1.':'tproxy-v1.')+token:(negotiationEnabled?'tproxy-auto-lane-v1.':'tproxy-lane-v1.')+token+'.'+String(laneID);
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const next=new WebSocket(socketURL(),protocol);next.binaryType='arraybuffer';let opened=false,lane=null;
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if(laneID===null)socket=next;else{lane=ensureLane(laneID);lane.socket=next}
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next.onopen=()=>{
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@@ -322,7 +375,7 @@ async function poll(){
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while(!closed&&sessionToken){
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try{
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pollController=new AbortController();
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const response=await request('/api/v1/down',()=>options('POST',sessionToken,null,{'X-Down-Cursor':downCursor},pollController.signal));
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const response=await request('/api/v1/down',options('POST',sessionToken,null,{'X-Down-Cursor':downCursor},pollController.signal));
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if(response.status===204){status('connected');continue}
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if(response.status!==200)throw new Error('downlink rejected');
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const next=response.headers.get('X-Down-Cursor')||'',data=await response.arrayBuffer();
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@@ -386,7 +439,7 @@ async function runLaneUp(lane){
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try{
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while(!closed&&sessionToken&&lane.pending.length){
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const batch=joinPending(lane.pending,lane),sequence=String(lane.sequence),laneID=String(lane.id);
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const response=await request('/api/v1/up',()=>options('POST',sessionToken,batch.body,{'X-Up-Seq':sequence,'X-Lane-ID':laneID}));
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const response=await request('/api/v1/up',options('POST',sessionToken,batch.body,{'X-Up-Seq':sequence,'X-Lane-ID':laneID}));
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if(response.status!==204||response.headers.get('X-Up-Ack')!==sequence)throw new Error('lane uplink rejected');
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release(batch.total,batch.count,lane);port.postMessage({t:'traffic',up:batch.total,down:0});lane.sequence++;
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if(!lane.polling)pollLane(lane);
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@@ -399,7 +452,7 @@ async function pollLane(lane){
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try{
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while(!closed&&sessionToken&&lanes.get(lane.id)===lane){
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const controller=new AbortController(),laneID=String(lane.id);lane.controller=controller;
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const response=await request('/api/v1/down',()=>options('POST',sessionToken,null,{'X-Down-Cursor':lane.cursor,'X-Lane-ID':laneID},controller.signal));
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const response=await request('/api/v1/down',options('POST',sessionToken,null,{'X-Down-Cursor':lane.cursor,'X-Lane-ID':laneID},controller.signal));
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if(response.status===204){
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if(response.headers.get('X-Lane-Closed')==='1'){finishLane(lane,false);return}
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status('connected');continue;
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@@ -415,7 +468,7 @@ async function pollLane(lane){
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finally{lane.polling=false;lane.controller=null}
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}
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function deleteSession(){
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if(sessionToken)fetch(relayOrigin+'/api/v1/session',options('DELETE',sessionToken,null,null,undefined,true)).catch(()=>{});
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const token=cleanupToken||sessionToken;if(token)fetch(relayOrigin+'/api/v1/session',options('DELETE',token,null,null,undefined,true)).catch(()=>{});
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}
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function close(notifyServer){
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if(closed)return;closed=true;if(carrierTimer)clearTimeout(carrierTimer);if(attemptController)attemptController.abort();if(pollController)pollController.abort();
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@@ -427,7 +480,7 @@ function activatePort(nextPort){
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initialized=true;port=nextPort;
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port.onmessage=message=>{
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if(message.data instanceof ArrayBuffer){
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if(!createStarted){createStarted=true;helloFrame=message.data;createSession(attemptEpoch)}
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if(!createStarted){createStarted=true;helloFrame=message.data;if(negotiationEnabled){negotiationStartedAt=Date.now();armCarrierDeadline(attemptEpoch)}createSession(attemptEpoch)}
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else if(!carrierCommitted){if(!reserve(message.data,null)){fail();return}pending.push(message.data);maybeStartCandidate()}
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else queueCarrier(message.data);
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}else if(message.data&&message.data.t==='close')close(true);
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Reference in New Issue
Block a user