papercats/server.js

// https://github.com/socketio/socket.io/blob/master/examples/chat/index.js
import MiServer from "mimi-server";
import { Server } from "socket.io";
import express from "express";
import path from "path";
import { exec, fork } from "child_process";
import { config } from "./config.js";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

config.dev ? exec("npm run build-dev") : exec("npm run build");

const port = process.env.PORT || config.port;

const { app, server } = new MiServer({
	port,
	static: path.join(__dirname, "public")
});

const io = new Server(server);

// Routing
app.use("/font", express.static(path.join(__dirname, "node_modules/@fortawesome/fontawesome-free")));

import Game from "./src/game-server.js";
const game = new Game();

io.on("connection", socket => {
	socket.on("hello", (data, fn) => {
		//TODO: error checking.
		if (data.god && game.addGod(socket)) {
			fn(true);
			return;
		}
		if (data.name && data.name.length > 32) fn(false, "Your name is too long!");
		else if (!game.addPlayer(socket, data.name)) fn(false, "There're too many platers!");
		else fn(true);
	});
	socket.on("pings", (fn) => {
		socket.emit("pongs");
		socket.disconnect();
	});
});

setInterval(() => {
	game.tickFrame();
}, 1000 / 60);

for (let i = 0; i < parseInt(config.bots); i++) {
	fork(path.join(__dirname, "paper-io-bot.js"), [`ws://localhost:${port}`], {
		stdio: "inherit"
	});
}