chore: add game server (Colyseus) - flat files

rolld_backend/game/.dockerignore

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+node_modules
+npm-debug.log
+.git
+.gitignore

rolld_backend/game/Dockerfile

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+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --omit=dev
+
+COPY . .
+
+EXPOSE 2567
+
+CMD ["node", "src/index.js"]

rolld_backend/game/package.json

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+{
+  "name": "rolld-game",
+  "version": "1.0.0",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node --watch src/index.js"
+  },
+  "dependencies": {
+    "@colyseus/core": "^0.17.39",
+    "@colyseus/schema": "^4.0.15",
+    "@colyseus/ws-transport": "^0.17.9",
+    "cors": "^2.8.6",
+    "express": "^4.22.1",
+    "zod": "^4.3.6"
+  }
+}

rolld_backend/game/src/index.js

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+const cors = require('cors');
+const { Server } = require('@colyseus/core');
+const { WebSocketTransport } = require('@colyseus/ws-transport');
+const { ArenaRoom } = require('./rooms/ArenaRoom');
+
+const PORT = process.env.PORT || 2567;
+
+// Colyseus 0.17 – express callback receives the transport's internal Express app
+const gameServer = new Server({
+  transport: new WebSocketTransport(),
+  express: (app) => {
+    app.use(cors());
+
+    app.get('/health', (_req, res) => {
+      res.json({ service: 'game', status: 'ok', timestamp: new Date().toISOString() });
+    });
+
+    app.get('/', (_req, res) => {
+      res.send('🎮 Game server running');
+    });
+  },
+});
+
+// Define rooms
+gameServer.define('arena', ArenaRoom);
+console.log('✅ ArenaRoom registered');
+
+gameServer.listen(PORT).then(() => {
+  console.log(`🎮 Game server running on ws://localhost:${PORT}`);
+});

rolld_backend/game/src/rooms/ArenaRoom.js

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+const { Room } = require("@colyseus/core");
+const { GameState, Player } = require("../schema/GameState");
+
+class ArenaRoom extends Room {
+  maxClients = 20;
+
+  onCreate(options) {
+    this.setState(new GameState());
+    this.setPatchRate(16); // ~62.5 Hz state broadcast
+    console.log(`[ArenaRoom] Room ${this.roomId} created (patchRate=16ms ~62Hz)`);
+
+    // Handle position updates from clients
+    this.onMessage("position", (client, data) => {
+      const player = this.state.players.get(client.sessionId);
+      if (!player) return;
+
+      player.x = data.x ?? player.x;
+      player.y = data.y ?? player.y;
+      player.z = data.z ?? player.z;
+      player.vx = data.vx ?? player.vx;
+      player.vy = data.vy ?? player.vy;
+      player.vz = data.vz ?? player.vz;
+      player.rx = data.rx ?? player.rx;
+      player.ry = data.ry ?? player.ry;
+      player.rz = data.rz ?? player.rz;
+      player.rw = data.rw ?? player.rw;
+      player.avx = data.avx ?? player.avx;
+      player.avy = data.avy ?? player.avy;
+      player.avz = data.avz ?? player.avz;
+      player.t = Date.now();
+    });
+
+    // Handle chat messages (optional, for future)
+    this.onMessage("chat", (client, data) => {
+      this.broadcast("chat", {
+        sender: client.sessionId,
+        name: this.state.players.get(client.sessionId)?.name || "???",
+        message: data.message,
+      });
+    });
+  }
+
+  onJoin(client, options) {
+    console.log(`[ArenaRoom] ${client.sessionId} joined (name: ${options.name || "anonymous"})`);
+
+    const player = new Player();
+    player.name = options.name || "Joueur";
+    player.colorR = options.colorR ?? 1;
+    player.colorG = options.colorG ?? 0.4;
+    player.colorB = options.colorB ?? 0.2;
+
+    // Find a spawn position away from other players
+    const spawnPos = this._findSpawnPosition();
+    player.x = spawnPos.x;
+    player.y = spawnPos.y;
+    player.z = spawnPos.z;
+    player.t = Date.now();
+
+    this.state.players.set(client.sessionId, player);
+  }
+
+  onLeave(client, consented) {
+    console.log(`[ArenaRoom] ${client.sessionId} left (consented: ${consented})`);
+    this.state.players.delete(client.sessionId);
+  }
+
+  onDispose() {
+    console.log(`[ArenaRoom] Room ${this.roomId} disposed`);
+  }
+
+  /**
+   * Find a spawn position elevated and away from existing players.
+   * Tries up to 10 random positions, picks the one farthest from others.
+   * Falls back to random if no good spot found.
+   */
+  _findSpawnPosition() {
+    const MIN_DIST = 3.0;
+    const SPAWN_Y = 5; // elevated spawn — ball drops naturally
+    const RANGE = 20;
+    let bestPos = { x: 0, y: SPAWN_Y, z: 0 };
+    let bestMinDist = 0;
+
+    const existingPositions = [];
+    this.state.players.forEach((p) => {
+      existingPositions.push({ x: p.x, z: p.z });
+    });
+
+    // If no existing players, just random
+    if (existingPositions.length === 0) {
+      return {
+        x: (Math.random() - 0.5) * RANGE,
+        y: SPAWN_Y,
+        z: (Math.random() - 0.5) * RANGE,
+      };
+    }
+
+    for (let attempt = 0; attempt < 10; attempt++) {
+      const cx = (Math.random() - 0.5) * RANGE;
+      const cz = (Math.random() - 0.5) * RANGE;
+      let minDist = Infinity;
+      for (const p of existingPositions) {
+        const dx = cx - p.x;
+        const dz = cz - p.z;
+        const d = Math.sqrt(dx * dx + dz * dz);
+        if (d < minDist) minDist = d;
+      }
+      if (minDist >= MIN_DIST) {
+        return { x: cx, y: SPAWN_Y, z: cz };
+      }
+      if (minDist > bestMinDist) {
+        bestMinDist = minDist;
+        bestPos = { x: cx, y: SPAWN_Y, z: cz };
+      }
+    }
+
+    return bestPos;
+  }
+}
+
+module.exports = { ArenaRoom };

rolld_backend/game/src/schema/GameState.js

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+const { Schema, MapSchema, defineTypes } = require("@colyseus/schema");
+
+class Player extends Schema {
+  constructor() {
+    super();
+    this.x = 0;
+    this.y = 5;
+    this.z = 0;
+    this.vx = 0;
+    this.vy = 0;
+    this.vz = 0;
+    this.rx = 0;
+    this.ry = 0;
+    this.rz = 0;
+    this.rw = 1;
+    this.t = 0;
+    this.name = "";
+    this.colorR = 1;
+    this.colorG = 1;
+    this.colorB = 1;
+    this.avx = 0;
+    this.avy = 0;
+    this.avz = 0;
+  }
+}
+
+defineTypes(Player, {
+  x: "float32",
+  y: "float32",
+  z: "float32",
+  vx: "float32",
+  vy: "float32",
+  vz: "float32",
+  rx: "float32",
+  ry: "float32",
+  rz: "float32",
+  rw: "float32",
+  t: "float64",
+  name: "string",
+  colorR: "float32",
+  colorG: "float32",
+  colorB: "float32",
+  avx: "float32",
+  avy: "float32",
+  avz: "float32",
+});
+
+class GameState extends Schema {
+  constructor() {
+    super();
+    this.players = new MapSchema();
+  }
+}
+
+defineTypes(GameState, {
+  players: { map: Player },
+});
+
+module.exports = { GameState, Player };