Dino Isle Online: multiplayer dino survival game (The Isle-like)

- Zero-dependency Node server: HTTP static + hand-rolled RFC6455 WebSocket + 20Hz authoritative simulation - Seeded island worldgen (tiles, forest decor, spawns) - 4 playable species, needs (food/water/stamina), rest, growth stages Hatchling->Apex - AI fauna: critters, fish shoals, Dryosaurus/Psittacosaurus herds; carcass feasting - PvP with knockback, kill feed, chat, leaderboard, minimap, day/night cycle - True top-down procedural dino renderer shared by menu cards and in-game - Developer mode (` key): god-mode, x6 XP, instant evolve, spawn AI, Alt+Click tp - Headless smoke tests, real-browser visual tests, pixel match checks
2026-08-23 07:00:08 +00:00
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+// ---------------------------------------------------------------
+// Dino Isle Online — main server: static files + websocket + game loop
+// Run: node server.js   (PORT env optional, default 8090)
+// ---------------------------------------------------------------
+'use strict';
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+
+const { Game, TICK_MS } = require('./sim');
+const wsattach = require('./ws').attach;
+
+const PORT = parseInt(process.env.PORT || '8095', 10);
+const PUBLIC_DIR = path.join(__dirname, 'public');
+const CHEATS = process.env.DEBUG_CHEATS === '1';
+
+const MIME = {
+  '.html': 'text/html; charset=utf-8',
+  '.js': 'text/javascript; charset=utf-8',
+  '.css': 'text/css; charset=utf-8',
+  '.json': 'application/json',
+  '.png': 'image/png',
+  '.svg': 'image/svg+xml',
+  '.ico': 'image/x-icon',
+  '.woff2': 'font/woff2',
+};
+
+const server = http.createServer((req, res) => {
+  let urlPath = decodeURIComponent((req.url || '/').split('?')[0]);
+  if (urlPath === '/') urlPath = '/index.html';
+  const filePath = path.normalize(path.join(PUBLIC_DIR, urlPath));
+  if (!filePath.startsWith(PUBLIC_DIR)) { res.writeHead(403); res.end('Forbidden'); return; }
+  fs.readFile(filePath, (err, data) => {
+    if (err) {
+      res.writeHead(404, { 'Content-Type': 'text/plain' });
+      res.end('Not found');
+      return;
+    }
+    const ext = path.extname(filePath).toLowerCase();
+    res.writeHead(200, {
+      'Content-Type': MIME[ext] || 'application/octet-stream',
+      'Cache-Control': 'no-store',
+    });
+    res.end(data);
+  });
+});
+
+const game = new Game();
+
+let nextAllowedMsg = new WeakMap(); // conn -> timestamp budget
+
+wsattach(server, '/ws', (conn) => {
+  conn.onmessage = (str) => {
+    let m;
+    try { m = JSON.parse(str); } catch (_) { return; }
+    if (!m || typeof m !== 'object') return;
+
+    // simple flood guard: max ~40 msgs/sec
+    const now = Date.now();
+    const budget = nextAllowedMsg.get(conn) || now;
+    if (now < budget - 1000) return; // way over -> drop
+    nextAllowedMsg.set(conn, Math.max(budget + 25, now));
+
+    const p = game.players.get(conn);
+    switch (m.t) {
+      case 'join': {
+        const player = game.join(conn, String(m.name || '').slice(0, 16), m.sp);
+        conn.send(JSON.stringify(game.welcomePayload(player)));
+        break;
+      }
+      case 'in':
+        if (p) game.onInput(p, m);
+        break;
+      case 'chat':
+        if (p && p.alive !== undefined) game.onChat(p, m.msg);
+        break;
+      case 'dev':
+        if (p) game.onDev(p, m);
+        break;
+      case 'devact':
+        if (p) game.onDevAct(p, String(m.act || ''));
+        break;
+      case 'ping': conn.send('{"t":"pong"}'); break;
+      case 'tp':
+        if (p && (CHEATS || p.dev)) {
+          p.x = Math.max(40, Math.min(7680 - 40, +m.x || p.x));
+          p.y = Math.max(40, Math.min(7680 - 40, +m.y || p.y));
+          if (typeof m.a === 'number') p.dir = m.a;
+          p.vx = 0; p.vy = 0;
+        }
+        break;
+      default:
+        break;
+    }
+  };
+  conn.onclose = () => game.leave(conn);
+});
+
+// heartbeat
+setInterval(() => {
+  for (const p of [...game.players.keys()]) {
+    const c = p; // key is conn
+    if (c.writable) c.ping();
+  }
+}, 25000);
+
+// main loop with drift compensation
+let last = Date.now();
+setInterval(() => {
+  const now = Date.now();
+  let dt = (now - last) / 1000;
+  last = now;
+  dt = Math.min(dt, 0.25); // clamp big pauses
+  try { game.tick(dt); } catch (e) { console.error('tick error', e); }
+}, TICK_MS);
+
+server.listen(PORT, () => {
+  console.log(`[dino-isle] listening on http://localhost:${PORT}  (seed=${game.seed})`);
+  console.log(`[dino-isle] open multiple browser tabs for multiplayer fun!`);
+});