papercats/server.js

//https://github.com/socketio/socket.io/blob/master/examples/chat/index.js
const express = require("express");
const app = express();
const path = require("path");
const os = require("os");
const chalk = require("chalk");
const server = require("http").createServer(app);
const io = require("socket.io")(server);
const { exec, fork } = require("child_process");

const config = require("./config.json");
config.dev ? exec("npm run build-dev") : exec("npm run build");

if (!(config.port >= 0 && config.port < 65536 && config.port % 1 === 0)) {
	console.error("[ERROR] `port` argument must be an integer >= 0 and < 65536. Default value will be used.");
	config.port = 8080;
}
const port = process.env.PORT || config.port;

server.listen(port, () => {
	console.log(chalk.yellow("Server available on:"));
	const ifaces = os.networkInterfaces();
	Object.keys(ifaces).forEach(dev => {
		ifaces[dev].forEach(details => {
			if (details.family === 'IPv4') {
				console.log((`  http://${details.address}:${chalk.green(port.toString())}`));
			}
		});
	});
	console.log("Hit CTRL-C to stop the server");
});
//Routing
app.use(express.static(path.join(__dirname, "public")));
app.use("/font", express.static(path.join(__dirname, "node_modules/@fortawesome/fontawesome-free")));

const Game = require("./src/game-server");
const game = new Game();
io.set("transports", ["websocket"]);
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'
	});
}