Sockets

backend/index.mjs

@@ -1,20 +0,0 @@
-import express from "express";
-import socketIO from "socket.io";
-
-const PORT = 3001;
-
-const app = express();
-
-app.get('/', (req, res) => res.send('Hello World!'));
-
-const server = app.listen(PORT, () => console.log(`Example app listening on port ${PORT}!`));
-const io = socketIO(server);
-
-io.on('connection', socket => {
-    console.log('a user connected', socket.id);
-
-    setInterval(() => {
-        console.log('send :)')
-        socket.emit("SENDING_NEW_TIME", "ASD")
-    }, 1500)
-});

backend/package.json

@@ -2,13 +2,12 @@
   "name": "centurion-via-backend",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "./src/index.mjs",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "",
   "license": "ISC",
-  "type": "module",
   "dependencies": {
     "express": "^4.17.1",
     "socket.io": "^2.3.0"

backend/src/Lobby.js

@@ -0,0 +1,109 @@
+const User = require("./User.js");
+
+module.exports = class Lobby {
+    /**
+     * @type {User[]}
+     */
+    users = [];
+    /**
+     * @type {string|undefined}
+     */
+    leaderId = undefined;
+
+    running = false;
+    runningInterval = undefined;
+    currentTime = 0;
+
+    constructor(name) {
+        this.name = name;
+    }
+
+    run() {
+        this.running = true;
+        this.runningInterval = setInterval(() => {
+            this.currentTime += 1;
+        }, 1000);
+    }
+
+    pause() {
+        this.running = false;
+        clearInterval(this.runningInterval);
+    }
+
+    /**
+     *
+     * @returns {boolean}
+     */
+    hasUsers() {
+        return this.users.length !== 0;
+    }
+
+
+    setRandomLeader() {
+        if (this.hasUsers()) {
+            this.leaderId = this.users[0].id;
+        }
+    }
+
+    /**
+     *
+     * @param {User} user
+     */
+    addUser(user) {
+        this.users.push(user);
+    }
+
+    /**
+     *
+     * @param id
+     * @returns {User|undefined}
+     */
+    getUser(id) {
+        return this.users.find(u => u.id === id);
+    }
+
+    /**
+     *
+     * @param {string} id
+     */
+    removeUser(id) {
+        this.users = this.users.filter(u => u.id !== id);
+    }
+
+    /**
+     *
+     * @returns {boolean}
+     */
+    hasLeader() {
+        return !!this.leaderId;
+    }
+
+    /**
+     *
+     * @param {string} id
+     * @returns {boolean}
+     */
+    isLeader(id) {
+        return this.leaderId === id;
+    }
+
+    /**
+     *
+     * @param {string} id
+     */
+    setLeader(id) {
+        if (!this.getUser(id)) {
+            throw new Error('user_not_in_lobby');
+        }
+
+        this.leaderId = id;
+    }
+
+    /**
+     *
+     * @returns {User|undefined}
+     */
+    getLeader() {
+        return this.users.find(u => u.id === this.leaderId)
+    }
+};

backend/src/User.js

@@ -0,0 +1,5 @@
+module.exports = class User {
+    constructor(id) {
+        this.id = id;
+    }
+};

backend/src/index.js

@@ -0,0 +1,44 @@
+const express = require("express");
+const socketIO = require("socket.io");
+
+const service = require("./service.js");
+const state = require("./state.js");
+
+const PORT = 3001;
+
+const app = express();
+const server = app.listen(PORT, () => console.log(`Example app listening on port ${PORT}!`));
+const io = socketIO(server);
+
+app.get('/', (req, res) => res.send('<pre>' + JSON.stringify(state) + '</pre>'));
+
+io.on('connection', socket => {
+    const socketId = socket.id;
+
+    console.log('a user connected', socketId);
+
+    const lobby = service.joinLobby(socketId);
+    socket.join(lobby.name);
+    socket.emit('welcome', {lobby: lobby.name});
+
+
+    socket.on('disconnect', (reason) => {
+        console.log('Disconnected:', socketId);
+        service.leaveLobby(socketId);
+    });
+
+    socket.on('join_lobby', (lobbyId, callback) => {
+        console.log(`${socketId} wants to join '${lobbyId}'.`);
+
+        // Leave current lobby first
+        service.leaveLobby(socketId);
+        const lobby = service.joinLobby(socketId, lobbyId);
+
+        socket.join(lobby.name);
+
+        callback(null, {
+            status: 'ok',
+            lobby: lobby.name
+        });
+    });
+});

backend/src/service.js

@@ -0,0 +1,43 @@
+const User = require("./User.js");
+const state = require("./state.js");
+
+/**
+ *
+ * @param {string} socketId
+ * @param {number|undefined} lobbyId
+ * @returns {Lobby}
+ */
+function joinLobby(socketId, lobbyId=undefined) {
+    let lobby = state.getLobby(lobbyId);
+    if (!lobby) {
+        lobby = state.createRandomLobby();
+    }
+
+    lobby.addUser(new User(socketId));
+
+    if (!lobby.hasLeader()) {
+        lobby.setLeader(socketId);
+    }
+
+    state.lobbies[lobby.name] = lobby;
+    return lobby;
+}
+
+function leaveLobby(socketId) {
+    Object.keys(state.lobbies).forEach(lobbyId => {
+        const lobby = state.getLobby(lobbyId);
+
+        lobby.removeUser(socketId);
+
+        if (!lobby.hasUsers()) {
+            state.removeLobby(lobbyId);
+            return;
+        }
+
+        if (lobby.getLeader() === socketId) {
+            lobby.setRandomLeader();
+        }
+    });
+}
+
+module.exports = {joinLobby, leaveLobby};

backend/src/state.js

@@ -0,0 +1,62 @@
+const Lobby = require("./Lobby.js");
+const User = require("./User.js");
+const {getRandomInt} = require("./util.js");
+
+class State {
+    /**
+     * @type {Object.<string, Lobby>}
+     */
+    lobbies = {};
+    lobbyCount = 0;
+
+    constructor() {
+    }
+
+    /**
+     * @returns {Lobby}
+     */
+    createRandomLobby() {
+        let lobby = undefined;
+
+        while (!lobby) {
+            const id = getRandomInt(100, Math.max(1000, this.lobbyCount * 2));
+            lobby = this.createLobby(id);
+        }
+
+        return lobby;
+    }
+
+    /**
+     *
+     * @param lobbyId
+     * @returns {Lobby|undefined}
+     */
+    getLobby(lobbyId) {
+        if (!lobbyId || !this.lobbies.hasOwnProperty(lobbyId)) {
+            return undefined;
+        }
+
+        return this.lobbies[lobbyId];
+    }
+
+    /**
+     * Returns undefined when the lobby already exists.
+     * @param {number} lobbyId
+     * @returns {Lobby|undefined}
+     */
+    createLobby(lobbyId) {
+        if (this.lobbies.hasOwnProperty(lobbyId)) {
+            return undefined;
+        }
+
+        this.lobbyCount += 1;
+        return new Lobby(lobbyId);
+    }
+
+    removeLobby(lobbyId) {
+        this.lobbyCount -= 1;
+        delete this.lobbies[lobbyId];
+    }
+}
+
+module.exports = new State();

backend/src/util.js

@@ -0,0 +1,15 @@
+/**
+ * Generates random int
+ * @param {number} min, inclusive
+ * @param {number} max, exclusive
+ * @returns {number}
+ */
+function getRandomInt(min, max) {
+    min = Math.ceil(min);
+    max = Math.floor(max);
+    return Math.floor(Math.random() * (max - min)) + min;
+}
+
+module.exports = {
+    getRandomInt
+};

backend/test/a.js

@@ -0,0 +1,15 @@
+const express = require('express');
+const state = require('./state.js');
+const b = require('./b.js');
+
+const PORT = 3002;
+
+const app = express();
+const server = app.listen(PORT, () => console.log(`Example app listening on port ${PORT}!`));
+
+app.get('/', (req, res) => {
+    let i = state.a;
+    b.test(i += 1);
+
+    return res.send('<pre>' + JSON.stringify(state) + '</pre>')
+});

backend/test/b.js

@@ -0,0 +1,7 @@
+const state = require('./state.js');
+
+module.exports = {
+    test: (i) => {
+        state.setA(i);
+    }
+};

backend/test/state.js

@@ -0,0 +1,12 @@
+class State {
+    a = 3;
+    constructor() {
+
+    }
+
+    setA(i) {
+        this.a = i;
+    }
+}
+
+module.exports = new State();

frontend/src/App.tsx

@@ -2,36 +2,56 @@ import React, {useEffect, useState} from 'react';
 import './App.css';
 import logo from "./via-logo.svg"
 import {Row} from "antd"
-import socket from "./util/socket";
+import socket, { emit } from "./util/socket";
 import NextShot from "./components/NextShot";
 import ShotsTaken from "./components/ShotsTaken";
 import Feed from "./components/Feed";
+import Lobby from "./components/Lobby";
 
 
 const App = () => {
+    const [connected, setConnected] = useState(false);
+    const [lobbyId, setLobbyId] = useState(null);
 
     useEffect(() => {
-        socket.on('connected', () => {
-            console.log('connected :)')
+        socket.on('welcome', async (obj: any) => {
+            const {lobby} = obj;
+            setLobbyId(lobby);
+            setConnected(true);
+
+            // const joined = await emit('join_lobby', 123);
         });
 
         return () => {
             socket.off("SENDING_NEW_TIME");
-            socket.off("connection");
+            socket.off("welcome");
         }
     });
 
+    const gameContent = (
+        <Row>
+            <NextShot/>
+            <Feed/>
+            <ShotsTaken/>
+        </Row>
+    );
+
+    const lobbyContent = (
+        <Row>
+            <Lobby/>
+        </Row>
+    );
+
+    const content = lobbyContent;
+
     return (
         <>
             <section className="content">
-                <Row>
-                    <NextShot/>
-                    <Feed/>
-                    <ShotsTaken/>
-                </Row>
+                {content}
             </section>
             <footer>
                 <img src={logo} className="via-logo" alt="logo"/>
+                <span>{connected ? 'Verbonden ' + lobbyId : ''}</span>
             </footer>
         </>
     );

frontend/src/components/Lobby.tsx

@@ -0,0 +1,25 @@
+import React, {useEffect} from 'react';
+import {Col, Progress} from "antd"
+import socket from "../util/socket";
+
+
+const Lobby = () => {
+    useEffect(() => {
+        socket.on("SENDING_NEW_TIME", (data: string) => {
+
+        });
+
+        return () => {
+            socket.off("SENDING_NEW_TIME");
+        }
+    });
+
+    return (
+        <Col className="sider" span={4} offset={10}>
+            <h1>Centurion!</h1>
+        </Col>
+
+    );
+};
+
+export default Lobby;

frontend/src/util/socket.ts

@@ -1,3 +1,23 @@
 import io from "socket.io-client";
 
-export default io("http://localhost:3001");
+
+const socket = io("http://localhost:3001");
+export default socket;
+
+/**
+ * Promisify emit.
+ * @param event
+ * @param arg
+ * @param callback
+ */
+export function emit(event: string, arg: any) {
+    return new Promise((resolve, reject) => {
+        socket.emit(event, arg, (err: any, res: any) => {
+            if (err) {
+                return reject(err);
+            }
+
+            resolve(res);
+        })
+    })
+}