diff --git a/poc-webrtc/README.md b/poc-webrtc/README.md new file mode 100644 index 0000000..a91f799 --- /dev/null +++ b/poc-webrtc/README.md @@ -0,0 +1,85 @@ +# chuck.js WebRTC POC + +Isolated test of WebRTC DataChannels (UDP-like, unreliable) as an alternative +to Socket.IO (TCP) for the game's networking. Does not touch the chuck.js code. + +## Run + +``` +cd poc-webrtc +npm install +npm start +``` + +Open two browser tabs: + +- http://localhost:1235/?transport=webrtc +- http://localhost:1235/?transport=socketio + +Use **A/D** or **←/→** to move, **Space** to jump. The blue box is yours; yellow +boxes are other connected clients (open more tabs to add players). + +The right-hand panel shows live RTT, packet rate, last received sequence +number, and number of detected sequence gaps (= packets the unreliable channel +silently dropped). + +Every connection also streams its stats to the server once per second. The +server writes everything to `runs/.jsonl` (one file per server +start). Use the **phase buttons** on the UI before/after changing network +conditions so the analyzer can group samples per phase. + +After a test session, summarize with: + +``` +node analyze.js +``` + +This prints a per-(transport, phase) table of RTT percentiles, receive rate, +and seq gap deltas — making the comparison quantitative instead of eyeball. + +## What to look for + +Baseline on localhost (no packet loss): both transports show single-digit +millisecond RTT and zero gaps. WebRTC's RTT may be a hair higher due to DTLS +overhead. That's fine — the point of the comparison is **under loss**. + +Add packet loss via Chrome DevTools (Network → "Add custom profile" with +download/upload throttling and packet loss) **or** via `tc netem` on Linux: + +``` +sudo tc qdisc add dev lo root netem loss 5% delay 50ms +# … run the test … +sudo tc qdisc del dev lo root +``` + +Expected difference under 5% loss: + +| Metric | Socket.IO | WebRTC unreliable | +|-----------------------|----------------------|------------------------| +| RTT median | rises slightly | rises slightly | +| RTT 95th percentile | spikes wildly (HoL) | stays close to median | +| Seq gaps | ≈ 0 (TCP retransmits)| matches loss rate | +| Box motion smoothness | stutters | smooth (skips a frame) | + +The Socket.IO tab will stutter visibly because TCP holds back all later +packets until the dropped one is retransmitted. The WebRTC tab will drop a +worldUpdate here and there but every other update arrives on time. + +## What this POC does NOT include + +- TURN server (only STUN — works on localhost/LAN; real internet may need + TURN for symmetric NATs) +- Reconnection / connection-loss handling +- Auth / encryption beyond WebRTC's built-in DTLS +- chuck.js's actual protocol (it mimics the *shape* — 14Hz broadcasts, input + events, ping/pong — not the message format) + +## Decision after running + +If WebRTC clearly outperforms under packet loss → write the integration plan +that swaps chuck.js's Socket.IO game-command stream for an unreliable +DataChannel (keeping Socket.IO or a reliable channel for join/leave/round +control). + +If the difference is marginal → the reconciliation-based approach already in +the game is probably good enough, and the integration cost isn't justified. diff --git a/poc-webrtc/analyze.js b/poc-webrtc/analyze.js new file mode 100644 index 0000000..4b8fa86 --- /dev/null +++ b/poc-webrtc/analyze.js @@ -0,0 +1,100 @@ +// Reads a run JSONL file and prints a per-(transport, phase) summary. +// Usage: node analyze.js [runs/.jsonl] +// If no file given, uses the most recent file in runs/. + +"use strict"; + +const fs = require("fs"); +const path = require("path"); + +function pickFile() { + if (process.argv[2]) return process.argv[2]; + const dir = path.join(__dirname, "runs"); + const files = fs.readdirSync(dir) + .filter((f) => f.endsWith(".jsonl")) + .map((f) => ({ f, t: fs.statSync(path.join(dir, f)).mtimeMs })) + .sort((a, b) => b.t - a.t); + if (!files.length) { + console.error("No run files in " + dir); + process.exit(1); + } + return path.join(dir, files[0].f); +} + +const file = pickFile(); +console.log("Analyzing: " + file + "\n"); + +const lines = fs.readFileSync(file, "utf8").trim().split("\n"); +const events = lines.map((l) => { try { return JSON.parse(l); } catch (_) { return null; } }).filter(Boolean); + +// Group stats events by (session, transport) → phase +// Phase is the most recent "phase" event for that session before this stats event. +const sessionPhase = new Map(); +const bucket = new Map(); // key: transport|phase → samples + +function bucketKey(transport, phase) { return transport + "|" + phase; } + +for (const e of events) { + if (e.type === "session_start") { + sessionPhase.set(e.session, "unmarked"); + } else if (e.type === "phase") { + sessionPhase.set(e.session, e.label || "unmarked"); + } else if (e.type === "stats") { + const phase = sessionPhase.get(e.session) || "unmarked"; + const k = bucketKey(e.transport, phase); + if (!bucket.has(k)) { + bucket.set(k, { + transport: e.transport, phase, + rtt: [], recvRate: [], sendRate: [], seqGaps: [], reports: 0 + }); + } + const b = bucket.get(k); + b.reports++; + for (const r of e.rttSamples) b.rtt.push(r); + b.recvRate.push(e.recvRate); + b.sendRate.push(e.sendRate); + b.seqGaps.push(e.seqGaps); + } +} + +function pct(arr, p) { + if (!arr.length) return NaN; + const s = arr.slice().sort((a, b) => a - b); + return s[Math.min(s.length - 1, Math.floor(s.length * p))]; +} +function mean(arr) { return arr.length ? arr.reduce((a, b) => a + b, 0) / arr.length : NaN; } +function fmt(n) { return Number.isFinite(n) ? n.toFixed(1) : " - "; } +function pad(s, n) { s = String(s); return s + " ".repeat(Math.max(0, n - s.length)); } + +if (!bucket.size) { + console.log("No stats events found in run."); + process.exit(0); +} + +const header = [ + pad("transport", 10), pad("phase", 18), + pad("samples", 8), pad("rtt p50", 10), pad("rtt p95", 10), + pad("rtt p99", 10), pad("rtt max", 10), + pad("recvHz", 8), pad("gapsΔ", 8) +].join(" "); +console.log(header); +console.log("-".repeat(header.length)); + +const keys = [...bucket.keys()].sort(); +for (const k of keys) { + const b = bucket.get(k); + const gapsDelta = b.seqGaps.length ? b.seqGaps[b.seqGaps.length - 1] - b.seqGaps[0] : 0; + console.log([ + pad(b.transport, 10), + pad(b.phase, 18), + pad(b.rtt.length, 8), + pad(fmt(pct(b.rtt, 0.5)), 10), + pad(fmt(pct(b.rtt, 0.95)), 10), + pad(fmt(pct(b.rtt, 0.99)), 10), + pad(fmt(Math.max(0, ...b.rtt)), 10), + pad(fmt(mean(b.recvRate)), 8), + pad(gapsDelta, 8) + ].join(" ")); +} + +console.log("\nLegend: rtt in ms, recvHz = worldUpdates/sec, gapsΔ = seq gaps observed during phase"); diff --git a/poc-webrtc/package-lock.json b/poc-webrtc/package-lock.json new file mode 100644 index 0000000..a20f5a6 --- /dev/null +++ b/poc-webrtc/package-lock.json @@ -0,0 +1,1576 @@ +{ + "name": "chuck-webrtc-poc", + "version": "0.0.1", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "chuck-webrtc-poc", + "version": "0.0.1", + "dependencies": { + "express": "^4.18.2", + "node-datachannel": "^0.10.0", + "socket.io": "^4.7.4", + "ws": "^8.16.0" + } + }, + "node_modules/@socket.io/component-emitter": { + "version": "3.1.2", + "resolved": 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"main": "server.js", + "private": true, + "scripts": { + "start": "node server.js" + }, + "dependencies": { + "express": "^4.18.2", + "node-datachannel": "^0.10.0", + "socket.io": "^4.7.4", + "ws": "^8.16.0" + } +} diff --git a/poc-webrtc/public/client.js b/poc-webrtc/public/client.js new file mode 100644 index 0000000..9d43877 --- /dev/null +++ b/poc-webrtc/public/client.js @@ -0,0 +1,80 @@ +// WebRTC DataChannel client. Signaling over WebSocket, then two channels: +// - reliable: default settings, used for welcome/control +// - unreliable: ordered:false, maxRetransmits:0 — used for game state + pings + +(function () { + const POC = window.POC; + POC.setStatus("signaling…", "wait"); + + const wsProto = location.protocol === "https:" ? "wss" : "ws"; + const ws = new WebSocket(wsProto + "://" + location.host + "/signal"); + + const pc = new RTCPeerConnection({ + iceServers: [{ urls: "stun:stun.l.google.com:19302" }] + }); + + // Create both channels client-side so the server's onDataChannel fires for both. + const reliable = pc.createDataChannel("reliable"); + const unreliable = pc.createDataChannel("unreliable", { + ordered: false, + maxRetransmits: 0 + }); + + function wireChannel(ch, label) { + ch.onopen = () => { + POC.log(`channel '${label}' open`); + if (label === "unreliable") { + POC.attach((obj) => { + if (ch.readyState === "open") ch.send(JSON.stringify(obj)); + }); + POC.setStatus("connected (webrtc unreliable)", "ok"); + } + }; + ch.onclose = () => { + POC.log(`channel '${label}' closed`); + POC.setStatus("disconnected", "bad"); + }; + ch.onerror = (e) => POC.log(`channel '${label}' error: ${e.message || e}`); + ch.onmessage = (e) => { + try { POC.handleMessage(JSON.parse(e.data)); } + catch (err) { POC.log("parse error: " + err.message); } + }; + } + wireChannel(reliable, "reliable"); + wireChannel(unreliable, "unreliable"); + + pc.onicecandidate = (e) => { + if (e.candidate) { + ws.send(JSON.stringify({ + type: "ice", + candidate: e.candidate.candidate, + mid: e.candidate.sdpMid + })); + } + }; + pc.onconnectionstatechange = () => { + POC.log("pc state: " + pc.connectionState); + if (pc.connectionState === "failed") POC.setStatus("failed", "bad"); + }; + + ws.onopen = async () => { + POC.log("signaling open, creating offer"); + const offer = await pc.createOffer(); + await pc.setLocalDescription(offer); + ws.send(JSON.stringify({ type: "sdp", sdp: offer.sdp, sdpType: offer.type })); + }; + ws.onmessage = async (e) => { + const m = JSON.parse(e.data); + if (m.type === "sdp") { + await pc.setRemoteDescription({ type: m.sdpType, sdp: m.sdp }); + POC.log("got remote sdp (" + m.sdpType + ")"); + } else if (m.type === "ice") { + try { + await pc.addIceCandidate({ candidate: m.candidate, sdpMid: m.mid }); + } catch (err) { + POC.log("addIceCandidate error: " + err.message); + } + } + }; + ws.onclose = () => POC.log("signaling closed"); +})(); diff --git a/poc-webrtc/public/common.js b/poc-webrtc/public/common.js new file mode 100644 index 0000000..62fc569 --- /dev/null +++ b/poc-webrtc/public/common.js @@ -0,0 +1,214 @@ +// Shared client-side helpers: rendering, stats, input. The transport-specific +// client (client.js or socketio-client.js) calls into POC.attach() with three +// callbacks: send(obj), onmessage handler (provided by POC), and a status setter. + +(function () { + const canvas = document.getElementById("world"); + const ctx = canvas.getContext("2d"); + const rttChart = document.getElementById("rtt-chart"); + const rttCtx = rttChart.getContext("2d"); + + const statusEl = document.getElementById("status"); + const statusDot = document.getElementById("status-dot"); + const rttEl = document.getElementById("rtt"); + const rttAvgEl = document.getElementById("rtt-avg"); + const rttP95El = document.getElementById("rtt-p95"); + const rateEl = document.getElementById("rate"); + const seqEl = document.getElementById("seq"); + const gapsEl = document.getElementById("gaps"); + const logEl = document.getElementById("log"); + + const state = { + myBoxId: null, + boxes: {}, + send: null, + pingSeq: 0, + outstandingPings: new Map(), + rttSamples: [], // sliding window, last 50 (for display) + rttBucket: [], // accumulator since last stats report + rateWindow: [], // worldUpdate receive times (last 1s) + sendWindow: [], // send times (last 1s) + lastSeq: 0, + seqGaps: 0, + inputSeq: 0 + }; + + const heldKeys = new Set(); + let lastSentCmd = null; + + function setStatus(text, cls) { + statusEl.textContent = text; + statusDot.className = "dot " + (cls || "wait"); + } + + function log(line) { + const ts = new Date().toISOString().substr(11, 12); + logEl.textContent = ts + " " + line + "\n" + logEl.textContent; + if (logEl.textContent.length > 4000) logEl.textContent = logEl.textContent.slice(0, 4000); + } + + function handleMessage(data) { + if (data.type === "welcome") { + state.myBoxId = data.boxId; + log("welcome boxId=" + data.boxId); + } else if (data.type === "worldUpdate") { + state.boxes = data.boxes || {}; + state.rateWindow.push(performance.now()); + if (data.seq > state.lastSeq + 1 && state.lastSeq > 0) { + state.seqGaps += data.seq - state.lastSeq - 1; + } + state.lastSeq = data.seq; + } else if (data.type === "pong") { + const sent = state.outstandingPings.get(data.t); + if (sent !== undefined) { + const rtt = performance.now() - sent; + state.outstandingPings.delete(data.t); + state.rttSamples.push(rtt); + state.rttBucket.push(rtt); + if (state.rttSamples.length > 50) state.rttSamples.shift(); + } + } + } + + function sendRaw(obj) { + if (!state.send) return; + state.sendWindow.push(performance.now()); + state.send(obj); + } + + function ping() { + if (!state.send) return; + const t = performance.now(); + state.outstandingPings.set(t, t); + sendRaw({ type: "ping", t }); + // GC stale pings (older than 5s) + for (const k of state.outstandingPings.keys()) { + if (performance.now() - k > 5000) state.outstandingPings.delete(k); + } + } + setInterval(ping, 100); + + function sendInput(cmd) { + if (!state.send || lastSentCmd === cmd) return; + lastSentCmd = cmd; + state.inputSeq++; + sendRaw({ type: "input", seq: state.inputSeq, cmd }); + } + + // Report stats to server every 1s for offline analysis + setInterval(() => { + if (!state.send) return; + const now = performance.now(); + state.sendWindow = state.sendWindow.filter((t) => now - t < 1000); + const bucket = state.rttBucket; + state.rttBucket = []; + sendRaw({ + type: "stats", + rttSamples: bucket, + recvRate: state.rateWindow.length, + sendRate: state.sendWindow.length, + lastSeq: state.lastSeq, + seqGaps: state.seqGaps, + outstanding: state.outstandingPings.size + }); + }, 1000); + + // Phase marker buttons + function markPhase(label) { + sendRaw({ type: "phase", label }); + log("phase → " + label); + } + window.POC_MARK = markPhase; + + function tickInput() { + const left = heldKeys.has("ArrowLeft") || heldKeys.has("a") || heldKeys.has("A"); + const right = heldKeys.has("ArrowRight") || heldKeys.has("d") || heldKeys.has("D"); + if (left && !right) sendInput("left"); + else if (right && !left) sendInput("right"); + else if (!left && !right) sendInput("stop"); + } + + window.addEventListener("keydown", (e) => { + if (e.repeat) return; + heldKeys.add(e.key); + if (e.key === " " || e.key === "Spacebar") { + state.inputSeq++; + if (state.send) state.send({ type: "input", seq: state.inputSeq, cmd: "jump" }); + e.preventDefault(); + } else { + tickInput(); + } + }); + window.addEventListener("keyup", (e) => { + heldKeys.delete(e.key); + tickInput(); + }); + + function fmt(n) { return n.toFixed(1); } + function p95(arr) { + if (!arr.length) return 0; + const sorted = arr.slice().sort((a, b) => a - b); + return sorted[Math.floor(sorted.length * 0.95)]; + } + + function refreshStats() { + const samples = state.rttSamples; + if (samples.length) { + const last = samples[samples.length - 1]; + const avg = samples.reduce((a, b) => a + b, 0) / samples.length; + rttEl.textContent = fmt(last) + " ms"; + rttAvgEl.textContent = fmt(avg) + " ms"; + rttP95El.textContent = fmt(p95(samples)) + " ms"; + } + const now = performance.now(); + state.rateWindow = state.rateWindow.filter((t) => now - t < 1000); + rateEl.textContent = String(state.rateWindow.length); + seqEl.textContent = String(state.lastSeq); + gapsEl.textContent = String(state.seqGaps); + } + setInterval(refreshStats, 200); + + function render() { + ctx.fillStyle = "#222"; + ctx.fillRect(0, 0, canvas.width, canvas.height); + ctx.fillStyle = "#444"; + ctx.fillRect(0, canvas.height - 20, canvas.width, 20); + for (const id in state.boxes) { + const b = state.boxes[id]; + ctx.fillStyle = id === state.myBoxId ? "#4cf" : "#cc6"; + ctx.fillRect(b.x - 15, b.y - 15, 30, 30); + ctx.fillStyle = "#111"; + ctx.font = "10px monospace"; + ctx.fillText(id, b.x - 8, b.y + 3); + } + + // RTT chart + rttCtx.fillStyle = "#1c1c1c"; + rttCtx.fillRect(0, 0, rttChart.width, rttChart.height); + const samples = state.rttSamples; + if (samples.length > 1) { + const max = Math.max(50, ...samples); + rttCtx.strokeStyle = "#4cf"; + rttCtx.beginPath(); + for (let i = 0; i < samples.length; i++) { + const x = (i / (samples.length - 1)) * rttChart.width; + const y = rttChart.height - (samples[i] / max) * (rttChart.height - 4) - 2; + if (i === 0) rttCtx.moveTo(x, y); else rttCtx.lineTo(x, y); + } + rttCtx.stroke(); + rttCtx.fillStyle = "#666"; + rttCtx.font = "9px monospace"; + rttCtx.fillText(max.toFixed(0) + "ms", 2, 10); + } + + requestAnimationFrame(render); + } + requestAnimationFrame(render); + + window.POC = { + attach(send) { state.send = send; }, + setStatus, + log, + handleMessage + }; +})(); diff --git a/poc-webrtc/public/index.html b/poc-webrtc/public/index.html new file mode 100644 index 0000000..1287516 --- /dev/null +++ b/poc-webrtc/public/index.html @@ -0,0 +1,67 @@ + + + + + chuck.js WebRTC POC + + + +

chuck.js networking POC — transport: ?

+
+
+ +
A/D or ←/→ move · Space jump
+
+
+
connectionconnecting…
+
RTT (last)– ms
+
RTT (avg, 50)– ms
+
RTT (95p, 50)– ms
+
worldUpdate /s0
+
recv seq0
+
seq gaps0
+ +
+
Mark phase in log:
+ + + + + +
+
+
+
+ + + + + diff --git a/poc-webrtc/public/socketio-client.js b/poc-webrtc/public/socketio-client.js new file mode 100644 index 0000000..29f758d --- /dev/null +++ b/poc-webrtc/public/socketio-client.js @@ -0,0 +1,20 @@ +// Socket.IO comparison client. Uses the same POC.attach() / POC.handleMessage() +// interface as the WebRTC client so the comparison is apples-to-apples. + +(function () { + const POC = window.POC; + POC.setStatus("connecting (socketio)…", "wait"); + + const sock = io({ path: "/socketio" }); + sock.on("connect", () => { + POC.log("socket.io connected " + sock.id); + POC.setStatus("connected (socket.io)", "ok"); + POC.attach((obj) => sock.emit("msg", obj)); + }); + sock.on("disconnect", () => { + POC.log("socket.io disconnected"); + POC.setStatus("disconnected", "bad"); + }); + sock.on("connect_error", (err) => POC.log("socket.io error: " + err.message)); + sock.on("msg", (data) => POC.handleMessage(data)); +})(); diff --git a/poc-webrtc/server.js b/poc-webrtc/server.js new file mode 100644 index 0000000..3e2b649 --- /dev/null +++ b/poc-webrtc/server.js @@ -0,0 +1,249 @@ +"use strict"; + +const express = require("express"); +const http = require("http"); +const path = require("path"); +const fs = require("fs"); +const { WebSocketServer } = require("ws"); +const { Server: SocketIOServer } = require("socket.io"); +const nodeDataChannel = require("node-datachannel"); + +const PORT = 1235; + +// ---------------- Run logging ---------------- + +const RUN_FILE = path.join(__dirname, "runs", new Date().toISOString().replace(/[:.]/g, "-") + ".jsonl"); +fs.mkdirSync(path.dirname(RUN_FILE), { recursive: true }); +fs.writeFileSync(RUN_FILE, JSON.stringify({ type: "run_start", t: Date.now() }) + "\n"); +console.log("Run log: " + RUN_FILE); + +function logEvent(obj) { + obj.t = obj.t || Date.now(); + fs.appendFile(RUN_FILE, JSON.stringify(obj) + "\n", () => {}); +} +const TICK_HZ = 60; +const BROADCAST_HZ = 14; +const WORLD_WIDTH = 800; +const WORLD_HEIGHT = 600; +const SPEED = 240; + +const app = express(); +app.use(express.static(path.join(__dirname, "public"))); + +const server = http.createServer(app); + +// ---------------- Shared game state ---------------- + +const boxes = {}; +let nextBoxId = 1; + +function createBox() { + const id = "b" + nextBoxId++; + boxes[id] = { + id, + x: WORLD_WIDTH / 2, + y: WORLD_HEIGHT / 2, + vx: 0, + vy: 0, + lastInputSeq: 0 + }; + return id; +} + +function destroyBox(id) { + delete boxes[id]; +} + +function applyInput(boxId, input) { + const b = boxes[boxId]; + if (!b) return; + if (input.seq !== undefined) b.lastInputSeq = input.seq; + if (input.cmd === "left") b.vx = -SPEED; + else if (input.cmd === "right") b.vx = SPEED; + else if (input.cmd === "stop") b.vx = 0; + else if (input.cmd === "jump") b.vy = -SPEED * 1.5; +} + +// Common handler for stats/phase messages so both transports log identically. +function handleClientReport(session, transport, data) { + if (data.type === "stats") { + logEvent({ + type: "stats", + session, transport, + rttSamples: data.rttSamples || [], + recvRate: data.recvRate || 0, + sendRate: data.sendRate || 0, + lastSeq: data.lastSeq || 0, + seqGaps: data.seqGaps || 0, + outstanding: data.outstanding || 0 + }); + } else if (data.type === "phase") { + logEvent({ type: "phase", session, transport, label: data.label || "" }); + console.log(`[${transport}] phase: ${data.label}`); + } +} + +setInterval(() => { + const dt = 1 / TICK_HZ; + for (const id in boxes) { + const b = boxes[id]; + b.x += b.vx * dt; + b.y += b.vy * dt + 0.5 * 800 * dt * dt; + b.vy += 800 * dt; + if (b.x < 0) { b.x = 0; b.vx = 0; } + if (b.x > WORLD_WIDTH) { b.x = WORLD_WIDTH; b.vx = 0; } + if (b.y > WORLD_HEIGHT - 20) { + b.y = WORLD_HEIGHT - 20; + b.vy = 0; + } + } +}, 1000 / TICK_HZ); + +function snapshotWorld() { + const out = {}; + for (const id in boxes) { + const b = boxes[id]; + out[id] = { x: b.x, y: b.y, ack: b.lastInputSeq }; + } + return out; +} + +// ---------------- WebRTC signaling + peer management ---------------- + +const wss = new WebSocketServer({ server, path: "/signal" }); +const rtcPeers = new Map(); +let nextPeerId = 1; + +let rtcBroadcastSeq = 0; +setInterval(() => { + rtcBroadcastSeq++; + const msg = JSON.stringify({ + type: "worldUpdate", + seq: rtcBroadcastSeq, + t: Date.now(), + boxes: snapshotWorld() + }); + for (const peer of rtcPeers.values()) { + const ch = peer.unreliable; + if (ch && ch.isOpen()) { + try { ch.sendMessage(msg); } catch (_) {} + } + } +}, 1000 / BROADCAST_HZ); + +wss.on("connection", (ws) => { + const peerId = "p" + nextPeerId++; + const boxId = createBox(); + console.log(`[webrtc] signaling open ${peerId} → box ${boxId}`); + + const pc = new nodeDataChannel.PeerConnection(peerId, { + iceServers: ["stun:stun.l.google.com:19302"] + }); + + const peer = { pc, boxId, reliable: null, unreliable: null }; + rtcPeers.set(peerId, peer); + logEvent({ type: "session_start", session: peerId, transport: "webrtc", boxId }); + + pc.onLocalDescription((sdp, type) => { + ws.send(JSON.stringify({ type: "sdp", sdp, sdpType: type })); + }); + pc.onLocalCandidate((candidate, mid) => { + ws.send(JSON.stringify({ type: "ice", candidate, mid })); + }); + + pc.onDataChannel((dc) => { + const label = dc.getLabel(); + if (label === "reliable") peer.reliable = dc; + else if (label === "unreliable") peer.unreliable = dc; + + dc.onOpen(() => { + console.log(`[webrtc] ${peerId} channel '${label}' open`); + if (label === "reliable") { + dc.sendMessage(JSON.stringify({ type: "welcome", boxId })); + } + }); + dc.onMessage((msg) => { + try { + const data = JSON.parse(msg); + if (data.type === "input") { + applyInput(boxId, data); + } else if (data.type === "ping") { + dc.sendMessage(JSON.stringify({ type: "pong", t: data.t })); + } else if (data.type === "stats" || data.type === "phase") { + handleClientReport(peerId, "webrtc", data); + } + } catch (_) {} + }); + dc.onClosed(() => console.log(`[webrtc] ${peerId} channel '${label}' closed`)); + }); + + ws.on("message", (raw) => { + try { + const m = JSON.parse(raw); + if (m.type === "sdp") pc.setRemoteDescription(m.sdp, m.sdpType); + else if (m.type === "ice") pc.addRemoteCandidate(m.candidate, m.mid); + } catch (e) { + console.error("[webrtc] bad signaling msg", e); + } + }); + + ws.on("close", () => { + console.log(`[webrtc] signaling closed ${peerId}`); + try { pc.close(); } catch (_) {} + rtcPeers.delete(peerId); + destroyBox(boxId); + logEvent({ type: "session_end", session: peerId, transport: "webrtc" }); + }); +}); + +// ---------------- Socket.IO comparison transport ---------------- + +const io = new SocketIOServer(server, { path: "/socketio" }); +const ioBoxes = new Map(); +let ioBroadcastSeq = 0; + +setInterval(() => { + ioBroadcastSeq++; + const msg = { + type: "worldUpdate", + seq: ioBroadcastSeq, + t: Date.now(), + boxes: snapshotWorld() + }; + for (const sock of ioBoxes.keys()) { + sock.emit("msg", msg); + } +}, 1000 / BROADCAST_HZ); + +io.on("connection", (sock) => { + const boxId = createBox(); + ioBoxes.set(sock, boxId); + console.log(`[socketio] connected ${sock.id} → box ${boxId}`); + sock.emit("msg", { type: "welcome", boxId }); + logEvent({ type: "session_start", session: sock.id, transport: "socketio", boxId }); + + sock.on("msg", (data) => { + if (data.type === "input") applyInput(boxId, data); + else if (data.type === "ping") sock.emit("msg", { type: "pong", t: data.t }); + else if (data.type === "stats" || data.type === "phase") { + handleClientReport(sock.id, "socketio", data); + } + }); + sock.on("disconnect", () => { + console.log(`[socketio] disconnected ${sock.id}`); + destroyBox(boxId); + ioBoxes.delete(sock); + logEvent({ type: "session_end", session: sock.id, transport: "socketio" }); + }); +}); + +server.listen(PORT, () => { + console.log(`POC server listening on http://localhost:${PORT}`); + console.log(` WebRTC test: http://localhost:${PORT}/?transport=webrtc`); + console.log(` Socket.IO: http://localhost:${PORT}/?transport=socketio`); +}); + +process.on("SIGINT", () => { + nodeDataChannel.cleanup(); + process.exit(0); +});