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#!/usr/bin/env node
const http = require("http");
const express = require("express");
const socketio = require("socket.io")
const PORT = 8080;
const app = express();
const server = http.Server(app);
const io = socketio(server);
// gameid -> {pl: [socket], started: Bool}
const games = new Map();
function genId() {
for (let i = 0; i < 10; i++) {
// 2176782336 == 36^6
const id = ("000000" + (2176782336 * Math.random() | 0).toString(36)).slice(-6);
if (!games.has(id)) return id;
}
return "";
}
function validId(id) {
return /^[0-9a-z]{6}$/.test(id);
}
app.get("/", (req, res) => {
const gameid = genId();
if (gameid == "") {
res.sendStatus(500);
return;
}
res.redirect("/game/" + gameid);
});
app.param("gameid", (req, res, next, gameid) => {
if (!validId(gameid)) {
res.sendStatus(404);
} else {
next();
}
});
app.get("/game/:gameid", (req, res) => {
res.sendFile(__dirname + "/game.html");
});
app.get("/game.css", (req, res) => res.sendFile(__dirname + "/game.css"));
app.get("/game.js", (req, res) => res.sendFile(__dirname + "/game.js"));
io.on("connection", (conn) => {
let gameid, gameobj;
conn.on("open", (id) => {
console.log("open " + id);
if (!validId(id)) {
console.log(" invalid");
conn.emit("redirect", "/");
conn.disconnect(true);
return;
}
gameobj = games.get(id);
if (gameobj != undefined) {
if (gameobj.pl.length == 1 && !gameobj.started) {
console.log(" serve");
gameid = id;
gameobj.pl.push(conn);
gameobj.pl[0].emit("status", "Get ready...");
gameobj.pl[1].emit("status", "Get ready...");
gameobj.pl[0].emit("serve", "left", 0.5, 0.5);
gameobj.pl[1].emit("serve", "right", 0.5, 0.5);
gameobj.started = true;
setTimeout(() => {
if (!gameobj || gameobj.pl.length != 2) return;
gameobj.pl[0].emit("status", "");
gameobj.pl[1].emit("status", "");
gameobj.pl[0].emit("startBall");
gameobj.pl[1].emit("start");
}, 2000);
} else {
console.log(" full");
gameobj = undefined;
conn.emit("status", "Game full! Opening new game...");
setTimeout(() => {
conn.emit("redirect", "/");
conn.disconnect(true);
}, 2000);
}
} else {
console.log(" new");
gameid = id;
gameobj = {pl: [conn], started: false};
games.set(gameid, gameobj);
conn.emit("status", "Waiting for other player...");
}
});
conn.on("disconnect", () => {
if (gameobj == undefined) return;
console.log("stop " + gameid);
const newpl = [];
for (const p of gameobj.pl) {
if (p != conn) {
p.emit("stop");
p.emit("status", "Other player left.");
setTimeout(() => {
p.emit("redirect", "/");
p.disconnect(true);
}, 2000);
newpl.push(p);
}
}
if (newpl.length == 0) {
console.log(" delete");
games.delete(gameid);
} else {
gameobj.pl = newpl;
}
});
conn.on("padvec", (pos, vel) => {
if (!gameobj) return;
for (const p of gameobj.pl) {
if (p != conn) {
p.emit("padvec", pos, vel);
}
}
});
});
server.listen(PORT, () => console.log("Listening on port " + PORT));
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