Something went wrong. Try again.
Monorepo for Aesthetic.Computer aesthetic.computer
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869import {WebSocketServer, WebSocket} from 'ws';import {attachSocketRoute} from './socket-routing.mjs';
// Same decision service and durable allowance as HTTP. No audio or tokens in URLs.export function attachMusicalSocket(server, {authenticate, decide, authMs=5000, lifetimeMs=600000}={}) { const wss=new WebSocketServer({noServer:true,maxPayload:8192,perMessageDeflate:false}); const accounts=new Map(); const upgrade=(req,socket,head)=>{ if(wss.clients.size>=64){socket.end('HTTP/1.1 503 Service Unavailable\r\nConnection: close\r\n\r\n');return;} wss.handleUpgrade(req,socket,head,ws=>wss.emit('connection',ws)); }; const detach=attachSocketRoute(server,['/api/easel-musical-stream'],upgrade); wss.on('connection',ws=>{ let subject,authenticating=false,active=null,queued=null,closed=false,alive=true; let messages=0,windowAt=Date.now(); const send=value=>{if(ws.readyState===WebSocket.OPEN){if(ws.bufferedAmount>16384)ws.close(1008,'Slow reader');else ws.send(JSON.stringify(value));}}; const authTimer=setTimeout(()=>ws.close(1008,'Authenticate first'),authMs); const lifeTimer=setTimeout(()=>ws.close(1000,'Renew session'),lifetimeMs); const pingTimer=setInterval(()=>{if(!alive){ws.terminate();return;}alive=false;ws.ping();},20000); for(const t of [authTimer,lifeTimer,pingTimer])t.unref?.(); ws.on('pong',()=>{alive=true;}); const fail=(body,status)=>send({type:'error',sessionId:body?.sessionId,sequence:body?.sequence,status}); async function run(body){ const task={body,controller:new AbortController()};active=task; const started=performance.now(); try{ const r=await decide({httpMethod:'POST',headers:{authorization:'socket-session'},body:JSON.stringify(body)},{subject,signal:task.controller.signal}); if(!closed&&!task.controller.signal.aborted){ if(r.statusCode===200)send({...JSON.parse(r.body),type:'decision',serverMs:Math.round(performance.now()-started)}); else fail(body,r.statusCode); } }catch{if(!closed&&!task.controller.signal.aborted)fail(body,503);} finally{active=null;if(queued&&!closed){const next=queued;queued=null;void run(next);}} } ws.on('message',async(data,binary)=>{ if(binary){ws.close(1003,'JSON only');return;} if(Date.now()-windowAt>=1000){messages=0;windowAt=Date.now();} if(++messages>30){ws.close(1008,'Input rate exceeded');return;} let m;try{m=JSON.parse(data.toString());}catch{ws.close(1008,'Invalid message');return;} if(!m||typeof m!=='object'){ws.close(1008,'Invalid message');return;} if(!subject){ if(authenticating||m.type!=='authenticate'||typeof m.token!=='string'||m.token.length>7000){ws.close(1008,'Authenticate first');return;} authenticating=true; try{ const user=await authenticate({authorization:`Bearer ${m.token}`}); if(closed)return; if(!user||(accounts.get(user)||0)>=2){ws.close(1008,'Account unavailable');return;} subject=user;accounts.set(subject,(accounts.get(subject)||0)+1);clearTimeout(authTimer);send({type:'ready'}); }catch{ws.close(1011,'Account unavailable');} return; } if(m.type==='ping'){send({type:'pong'});return;} if(m.type==='cancel'){ if(active?.body.sessionId===m.sessionId)active.controller.abort(); if(queued?.sessionId===m.sessionId)queued=null; return; } if(m.type!=='observation'||!m.body||JSON.stringify(m.body).length>2048){ws.close(1008,'Invalid observation');return;} const body=m.body; if(!body||typeof body.sessionId!=='string'||!Number.isInteger(body.sequence)){ws.close(1008,'Invalid observation');return;} send({type:'received',sessionId:body.sessionId,sequence:body.sequence}); if(active){if(queued)fail(queued,409);queued=body;}else void run(body); }); ws.on('error',()=>{}); ws.on('close',()=>{closed=true;clearTimeout(authTimer);clearTimeout(lifeTimer);clearInterval(pingTimer);active?.controller.abort();queued=null;if(subject){const n=(accounts.get(subject)||1)-1;if(n)accounts.set(subject,n);else accounts.delete(subject);}}); }); return {close(){detach();for(const ws of wss.clients)ws.terminate();wss.close();},wss};}