t00-multiuser/server/index.ts

import Config from "./objects/Config";
import SimpleProm from "simple-prom";
import Gauge from "simple-prom/lib/objects/Gauge";
import Counter from "simple-prom/lib/objects/Counter";

const metrics = SimpleProm.init({
	selfHost: true,
	selfHostPort: Config.ports.metrics ?? 9100
});

const onlineUsers = metrics.addMetric(new Gauge("multiprobe_open_connections"));
onlineUsers.setHelpText("Number of connections to the websocket");

const onlineUsersUnique = metrics.addMetric(new Gauge("multiprobe_unique_connections"));
onlineUsersUnique.setHelpText("Number of unique user connections to the websocket");

const dataIn = metrics.addMetric(new Counter("multiprobe_data_in"));
dataIn.setHelpText("Data received by the server in bytes");

const dataOut = metrics.addMetric(new Counter("multiprobe_data_out"));
dataOut.setHelpText("Data sent by the server in bytes");

import { createReader, createWriter, Endian } from "bufferstuff";
import { WebSocketServer } from "ws";
import Fastify from "fastify";
import FastifyFormBody from "@fastify/formbody";
import FastifyCookie from "@fastify/cookie";
import FastifyView from "@fastify/view";
import EJS from "ejs";
import FunkyArray from "funky-array";
import RemoteUser from "./objects/RemoteUser";
import { MessageType } from "./enums/MessageType";
import Database from "./objects/Database";
import { Console } from "hsconsole";
import UserService from "./services/UserService";
import Party from "./entities/Party";
import Controller from "./controller/Controller";
import HomeController from "./controller/HomeController";
import AccountController from "./controller/AccountController";
import PartyController from "./controller/PartyController";
import ApiController from "./controller/ApiController";
import PartyService from "./services/PartyService";

Console.customHeader(`MultiProbe server started at ${new Date()}`);

const users = new FunkyArray<string, RemoteUser>();

new Database(Config.database.address, Config.database.port, Config.database.username, Config.database.password, Config.database.name);

// Web stuff

const fastify = Fastify({
	logger: false
});

fastify.register(FastifyView, { engine: { ejs: EJS } });
fastify.register(FastifyFormBody);
fastify.register(FastifyCookie, {
	secret: Config.session.secret,
	parseOptions: {
		path: "/",
		secure: true
	}
});

fastify.setNotFoundHandler(async (req, res) => {
	return res.status(404).view("templates/404.ejs", { });
});

Controller.FastifyInstance = fastify;
new HomeController();
new AccountController();
new PartyController();
new ApiController();

// Websocket stuff

const websocketServer = new WebSocketServer({
	port: Config.ports.ws
}, () => {
	Console.printInfo(`WebsocketServer listening at ws://localhost:${Config.ports.ws}`);
	fastify.listen({ port: Config.ports.http, host: "0.0.0.0" }, (err, address) => {
		if (err) {
			Console.printError(`Error occured while spinning up fastify:\n${err}`);
			process.exit(1);
		}
	
		Console.printInfo(`Fastify listening at ${address.replace("0.0.0.0", "localhost")}`);
	
		Console.printInfo("MultiProbe is ready to go!");
	});
});

function sendToAllButSelf(user:RemoteUser, data:Buffer) {
	users.forEach(otherUser => {
		if (otherUser.id !== user.id && otherUser.currentURL === user.currentURL) {
			otherUser.send(data);
		}
	});
}

function sendToAll(user:RemoteUser, data:Buffer) {
	users.forEach(otherUser => {
		if (otherUser.currentURL === user.currentURL) {
			otherUser.send(data);
		}
	});
}

function sendToAllInGroup(user:RemoteUser, data:Buffer) {
	users.forEach(otherUser => {
		if (otherUser.groupId === user.groupId && otherUser.userId !== user.userId) {
			otherUser.send(data);
		}
	});
}

const afkInterval = setInterval(() => {
	users.forEach(otherUser => {
		if (Date.now() - otherUser.timeLastMovedCursor >= 30000 && !otherUser.isAfk) {
			otherUser.isAfk = true;
			const afkPacket = createWriter(Endian.LE, 6).writeByte(MessageType.HonkShoe).writeUInt(otherUser.id).writeBool(otherUser.isAfk).toBuffer();
			sendToAllButSelf(otherUser, afkPacket);
		}
	});
}, 5000);

async function updateConnectionMetrics() {
	onlineUsers.Value = users.length;
	let userCount = 0;
	const checkedUsers = new Array<string>();
	await users.forEach(user => {
		if (!checkedUsers.includes(user.username)) {
			userCount++;
			checkedUsers.push(user.username);
		}
	});
	onlineUsersUnique.Value = userCount;
}

websocketServer.on("connection", (socket) => {
	const myUUID = crypto.randomUUID();
	let user:RemoteUser;

	function closeOrError() {
		if (users.has(myUUID)) {
			users.remove(myUUID);

			const userLeftPacket = createWriter(Endian.LE, 5).writeByte(MessageType.ClientLeft).writeUInt(user.id).toBuffer();
			users.forEach(otherUser => otherUser.send(userLeftPacket));
			sendGroupUpdate(user);
		}
		updateConnectionMetrics();
	}

	async function sendGroupUpdate(sendUser:RemoteUser, groupSend = false) {
		if (!sendUser || sendUser.groupId === Number.MIN_VALUE) {
			return;
		}

		const usersInGroup = new FunkyArray<number, RemoteUser>();
		let totalUsernameLength = 0;

		await users.forEach(otherUser => {
			if (sendUser.groupId === otherUser.groupId && sendUser.userId !== otherUser.userId) {
				if (usersInGroup.has(otherUser.userId)) {
					totalUsernameLength += otherUser.username.length;
				}
				usersInGroup.set(otherUser.userId, otherUser);
			}
			if (!groupSend && sendUser.userId !== otherUser.userId) {
				sendGroupUpdate(otherUser, true);
			}
		});

		const writer = createWriter(Endian.LE)
			.writeByte(MessageType.GroupData)
			.writeShortString(sendUser.groupName)
			.writeUShort(usersInGroup.length);
		await usersInGroup.forEach(otherUser => {
			writer.writeShortString(otherUser.username).writeString(otherUser.rawURL);
		});

		const groupData = writer.toBuffer();

		sendUser.send(groupData);
	}

	socket.on("close", closeOrError);
	socket.on("error", closeOrError);

	socket.on("message", async (data) => {
		const reader = createReader(Endian.LE, data as Buffer);
		dataIn.add(reader.length);
		if (reader.length > 0 && reader.length < 1024) {
			switch (reader.readUByte()) {
				case MessageType.KeepAlive:
				{
					if (user !== undefined) {
						user.lastKeepAliveTime = Date.now();
					}
					break;
				}
				case MessageType.ClientDetails:
				{
					if (user !== undefined) {
						return;
					}
					const apiKey = reader.readShortString();
					const rawURL = reader.readString();
					const dbUser = await UserService.GetUserByAPIKey(apiKey);
					if (dbUser == null) {
						return;
					}
					const dbUserParty = await UserService.GetActiveParty(dbUser.Id);
					let dbParty: Party | null = null;
					if (dbUserParty) {
						dbParty = await PartyService.GetParty(dbUserParty.PartyId);
					}

					let page = rawURL.toLowerCase().replace(".htm", "").replace(".html", "");
					if (page === "index") {
						page = "";
					}
					let lengthOfUsernames = 0;
					const usersOnPage = new Array<RemoteUser>();
					await users.forEach(otherUser => {
						if (otherUser.currentURL === page) {
							usersOnPage.push(otherUser);
							lengthOfUsernames += otherUser.username.length + 1; // + 1 for length byte
						}
					});
					const usersToSend = createWriter(Endian.LE, 3 + (usersOnPage.length * 13) + lengthOfUsernames).writeByte(MessageType.Clients).writeUShort(usersOnPage.length);
					for (const otherUser of usersOnPage) {
						usersToSend.writeUInt(otherUser.id).writeShortString(otherUser.username).writeFloat(otherUser.cursorX).writeInt(otherUser.cursorY).writeBool(otherUser.isAfk);
					}
					if (dbParty) {
						user = users.set(myUUID, new RemoteUser(socket, dataOut, myUUID, dbUser.Username, page, rawURL, dbUser.Id, dbParty.Id, dbParty.Name));
					} else {
						user = users.set(myUUID, new RemoteUser(socket, dataOut, myUUID, dbUser.Username, page, rawURL, dbUser.Id, Number.MIN_VALUE, ""));
					}
					sendToAllButSelf(user, createWriter(Endian.LE, 6 + dbUser.Username.length).writeByte(MessageType.ClientJoined).writeUInt(user.id).writeShortString(dbUser.Username).toBuffer());
					user.send(usersToSend.toBuffer());
					sendGroupUpdate(user);
					updateConnectionMetrics();
					break;
				}
				case MessageType.CursorPos:
				{
					if (user === undefined) {
						return;
					}
					user.cursorX = reader.readFloat();
					user.cursorY = reader.readInt();
					sendToAllButSelf(user, createWriter(Endian.LE, 13).writeByte(MessageType.CursorPos).writeUInt(user.id).writeFloat(user.cursorX).writeInt(user.cursorY).toBuffer());

					user.timeLastMovedCursor = Date.now();
					if (user.isAfk) {
						user.isAfk = false;
						const afkPacket = createWriter(Endian.LE, 6).writeByte(MessageType.HonkShoe).writeUInt(user.id).writeBool(user.isAfk).toBuffer();
						sendToAllButSelf(user, afkPacket);
					}
					break;
				}
				case MessageType.Ping:
				{
					if (user === undefined) {
						return;
					}

					if ((Date.now() - user.lastPingReset) >= 1000) {
						user.allowedPings = 10;
						user.lastPingReset = Date.now();
					}

					if (user.allowedPings > 0) {
						user.allowedPings--;
						const cursorX = reader.readFloat();
						const cursorY = reader.readInt();
						const packet = createWriter(Endian.LE, 9).writeByte(MessageType.Ping).writeFloat(cursorX).writeInt(cursorY).toBuffer();
						sendToAll(user, packet);
					}
					break;
				}
				case MessageType.HonkShoe:
				{
					if (user === undefined) {
						return;
					}

					user.isAfk = reader.readBool();

					const afkPacket = createWriter(Endian.LE, 6).writeByte(MessageType.HonkShoe).writeUInt(user.id).writeBool(user.isAfk).toBuffer();
					sendToAllButSelf(user, afkPacket);

					break;
				}
			}
		}
	});
});

let isShuttingDown = false;
function shutdown() {
	if (isShuttingDown) {
		return;
	}
	isShuttingDown = true;

	Console.printInfo("Shutting down...");
	websocketServer.close(async () => {
		await fastify.close();
		clearInterval(afkInterval);

		Console.cleanup();
		console.log("Goodbye!");
	});
}

process.on("SIGQUIT", shutdown);
process.on("SIGINT", shutdown);
//process.on("SIGUSR2", shutdown);