├── .gitignore ├── LICENSE ├── Procfile ├── README.md ├── game-server.js ├── package-lock.json ├── package.json ├── public ├── js │ ├── index.js │ ├── modules │ │ ├── renderUpdates.js │ │ └── utils.js │ └── player.js └── views │ ├── game-code-wrong.html │ ├── game-host.html │ ├── game-not-host.html │ ├── game-started.html │ ├── index.html │ └── style.css └── server.js /.gitignore: -------------------------------------------------------------------------------- 1 | *node_modules 2 | .env 3 | .vscode 4 | .eslintrc.json 5 | .prettierrc 6 | node_modules 7 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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It provides a communication framework so that your players can communicate with a central server, in realtime, for the entire duration of the gameplay. 4 | 5 | It also allows you to implement a 'game rooms' feature using Node JS worker threads, allowing you to spin up multiple instances of the game, each with a separate group of players. 6 | 7 | ![Game demo gif](https://user-images.githubusercontent.com/5900152/91305901-ac064900-e7a3-11ea-8fb9-b94ca7310777.gif) 8 | 9 | ## Games built using this framework 10 | 11 | 1. Multiplayer space invaders - [GitHub project](https://github.com/Srushtika/realtime-multiplayer-space-invaders) | [Tutorial](https://dev.to/ablydev/building-a-realtime-multiplayer-browser-game-in-less-than-a-day-part-1-4-14pm) | [Demo](https://space-invaders-multiplayer.herokuapp.com/) 12 | 13 | 2. Multiplayer Flappy birds - [GitHub Project](https://github.com/Srushtika/multiplayer-flappy-bird) | [Video tutorial](https://www.youtube.com/watch?v=ReGHyTh1ydU) 14 | 15 | (...make a PR to add yours!) 16 | 17 | ## The tech stack 18 | 19 | ### On the server side 20 | 21 | - [Node JS](https://nodejs.org/en/) 22 | - [Express](https://expressjs.com/) 23 | 24 | ### On the client side 25 | 26 | - [Vanilla JS](https://developer.mozilla.org/en-US/docs/Web/JavaScript) 27 | 28 | ### Libraries used 29 | 30 | - [Ably Realtime](https://www.ably.io) 31 | - [Bootstrap](https://getbootstrap.com/) 32 | - [DotEnv](https://www.npmjs.com/package/dotenv) 33 | 34 | ## How to run this kit locally 35 | 36 | 1. Clone this repo 37 | 38 | ```sh 39 | git clone https://github.com/Srushtika/multiplayer-scalable-game-networking-starter-kit.git 40 | ``` 41 | 42 | 2. Change directory into the project folder 43 | 44 | ```sh 45 | cd multiplayer-scalable-game-networking-starter-kit.git 46 | ``` 47 | 48 | 3. Install the dependencies 49 | 50 | ```sh 51 | npm install 52 | ``` 53 | 54 | 4. Create a free account with [Ably Realtime](https://www.ably.io/) to get your Ably API KEY. Add a new file in called `.env` and add the following. (Remember to replace the placeholder with your own API Key. You can get your Ably API key from your Ably dashboard): 55 | 56 | ``` 57 | ABLY_API_KEY= 58 | PORT=5000 59 | ``` 60 | 61 | 5. Run the server 62 | 63 | ```sh 64 | node server.js 65 | ``` 66 | 67 | 6. To see the realtime communication in action, open the app in two separate browser windows side-by-side: [https://localhost:5000](https://localhost:5000) 68 | 69 | 7. Create a game room in one window and join the room as a 'non-host' player by using the unique code in the other window. 70 | 71 | 8. Start the game when you are ready and use the arrow keys to publish dummy player input. You will see the change happening at the same time in both the windows. 72 | 73 | Voila! Your multiplayer game networking framework is up and running, now replace the game logic with yours and make it your own. 74 | 75 | Feel free to share your multiplayer game with me on [Twitter](https://twitter.com/Srushtika), I'll be happy to give it a shoutout! 76 | 77 | --- 78 | 79 | ## What's in which file? 80 | 81 | ### On the server 82 | 83 | #### 1. `server.js` 84 | 85 | This file has the main server thread. It performs three functions: 86 | 87 | - Serve the HTML and JS for front-end clients using Express. 88 | - Authenticate front-end clients with the Ably Realtime service using [Token Auth strategy](https://www.ably.io/documentation/core-features/authentication#token-authentication). 89 | - Create and manage Node JS worker threads when a host player requests to create a new game room. 90 | 91 | #### 2. `game-server.js` 92 | 93 | This file represents a Node JS worker thread and a new instance of this file will run for every game room created. When the game is finished, the worker thread is killed. When a new player joins or leaves the worker thread communicates with the parent thread (main thread aka server.js) and lets it know the number of players (among other things). 94 | 95 | ### On the client 96 | 97 | #### 1. `index.html` and `index.js` 98 | 99 | These files represent the home page where a player can choose to host a new game or join a game using the room's unique code. 100 | 101 | Homepage 102 | 103 | #### 2. `game-host.html` and `game-not-host.html` 104 | 105 | As the names suggest, these are the HTML files for the host player and non-host player respectively. Being the host of the game allows for additional controls like starting or stopping the game, hence the different views. 106 | 107 | a. Staging area for host player 108 | 109 | Host staging 110 | 111 | b. Game area for host player 112 | 113 | Host game 114 | 115 | c. Staging area for non-host player 116 | 117 | Non host staging 118 | 119 | d. Game area for non-host player 120 | 121 | Non host game 122 | 123 | #### 3. `game-started.html` and `game-code-wrong.html` 124 | 125 | Again as the names suggest, these pages are shown when a non-host player tries to join a game using a unique code, either when the game has already started or that game code doesn't exist, respectively. 126 | 127 | Game started 128 | 129 | Game room doesn't exist 130 | 131 | #### 4. `player.js` 132 | 133 | This file contains the main front-end logic for both host and non-host type players. It uses ES6 modules to import two other files: 134 | 135 | ##### 4.a. `modules/renderUpdates.js` 136 | 137 | This file contains all the methods that render the game UI on the webpage as per the latest realtime updates. 138 | 139 | ##### 4.b. `modules/utils.js` 140 | 141 | This file contains all the utility methods used in the game. 142 | 143 | #### 5. `style.css` 144 | 145 | This file has all the styles that are applied on top of Bootstrap styles. 146 | 147 | --- 148 | 149 | ## Core concepts 150 | 151 | ### The communication architecture 152 | 153 | Before we look at the architecture and design of the app, we need to understand a few concepts based on which this app is built 154 | 155 | #### Client-Server game strategy with an authoritative server 156 | 157 | The [Client-Server game building strategy](https://www.gabrielgambetta.com/client-server-game-architecture.html) allows for high scalability when compared to the [Peer-to-Peer strategy](https://web.archive.org/web/20190407004521/https://gafferongames.com/post/what_every_programmer_needs_to_know_about_game_networking/). In this design, the game server can be considered as the single source of truth and is responsible to maintain the latest game state at all times. All the players send their state to the game server, which in turn collates them together and sends it back at the same time to all the players. 158 | 159 | The client-side script will use this state received from the game server to render the game objects on players' screens accordingly, ensuring all the players are fully in-sync. 160 | 161 | ![Client/Server game strategy](https://user-images.githubusercontent.com/5900152/90788135-61955000-e2fd-11ea-9448-0e02ab45030a.png) 162 | 163 | #### The WebSockets protocol 164 | 165 | The [WebSockets protocol](https://www.ably.io/concepts/websockets), unlike HTTP, is a stateful communications protocol that works over TCP. The communication initially starts off as an HTTP handshake, but if both the communicating parties agree to continue over WebSockets then the connection is elevated; giving rise to a full-duplex, persistent connection. This means the connection remains open for the duration that the application is in use. This gives the server a way to initiate any communication and send data to pre-subscribed clients, so they don’t have to keep sending requests inquiring about the availability of new data. Which is exactly what we need in our game! 166 | 167 | This project uses [Ably Realtime](https://www.ably.io) to implement WebSocket based realtime messaging between the game server and the players. Ably, by default, deals with scalability, protocol interoperability, reliable message ordering, guaranteed message delivery historical message retention and authentication, so we don't have to. This communication follows the [Pub/Sub messaging pattern](https://www.ably.io/concepts/pub-sub). 168 | 169 | ##### Publish/Subscribe messaging pattern 170 | 171 | [Pub/Sub](https://www.ably.io/concepts/pub-sub) messaging allows various front-end or back-end clients to publish some data and/or subscribe to some data. For any active subscriptions, these clients will receive asynchronous event callbacks when a new message is published. 172 | 173 | ##### Channels 174 | 175 | In any realtime app, there's a lot of moving data involved. [Channels](https://www.ably.io/documentation/core-features/channels) help us group this data logically and let us implement subscriptions per channel. This allowing us to implement the custom callback logic for different scenarios. In the diagram above, each color would represent a channel. 176 | 177 | ##### Presence 178 | 179 | [Presence](https://www.ably.io/documentation/core-features/presence) is an Ably feature using which you can track the connection status of various clients on a channel. In essence, you can see who has just come online and who has left using each client's unique `clientId` 180 | 181 | #### Sequence of events with Node JS worker threads (For an example game) 182 | 183 | ![Sequence of events](https://user-images.githubusercontent.com/5900152/90802008-8cd46b00-e30e-11ea-8c37-5c99a73c8edd.png) 184 | 185 | --- 186 | 187 | ## Documentation 188 | 189 | ### Creating Node JS worker threads 190 | 191 | This kit uses Node JS worker threads to create new game rooms so various groups of people can simultaneously play the game. 192 | 193 | To create and use Node JS worker threads, from the main thread, you'll need to require the `worker_threads` library: 194 | 195 | ```js 196 | const { 197 | Worker, 198 | isMainThread, 199 | parentPort, 200 | workerData, 201 | threadId, 202 | MessageChannel, 203 | } = require('worker_threads'); 204 | ``` 205 | 206 | and instance a new worker and pass it two parameters: 207 | 208 | a) path to the worker file 209 | 210 | b) data as a JSON object 211 | 212 | ```js 213 | const worker = new Worker('./game-server.js', { 214 | workerData: { 215 | hostNickname: hostNickname, 216 | hostRoomCode: hostRoomCode, 217 | hostClientId: hostClientId, 218 | }, 219 | }); 220 | ``` 221 | 222 | In the worker file, you'll need to require the same library `worker_threads`. You'll have access to the `workerData` object directly. For example, in the worker thread, you can access the host nickname with `workerData.hostNickname` 223 | 224 | ##### Communication between worker and main threads 225 | 226 | The worker thread can publish data to the main thread as follows: 227 | 228 | ```js 229 | parentPort.postMessage({ 230 | roomCode: roomCode, 231 | totalPlayers: totalPlayers, 232 | isGameOn: isGameOn, 233 | isGameOver: isGameOver, 234 | }); 235 | ``` 236 | 237 | In this kit, the worker thread communicates with the main thread on three occasions: 238 | 239 | 1. When a new player joins the game room. 240 | 2. When an existing player leaves the game room. 241 | 3. When the game is over and the worker thread is going to be killed. 242 | 243 | This information is used by the main server thread to maintain a list of active worker threads, along with the number of players in each. 244 | 245 | #### Connecting to Ably 246 | 247 | In order to use this kit, you will need an Ably API key. If you are not already signed up, you can [sign up now for a free Ably account](https://www.ably.io/signup). Once you have an Ably account: 248 | 249 | - Log into your app dashboard 250 | - Under **Your apps**, click on **Manage app** for any app you wish to use for this tutorial, or create a new one with the **Create New App** button 251 | - Click on the **API Keys** tab 252 | - Copy the secret **API Key** value from your Root key. 253 | 254 | The server-side scripts connect to Ably using [Basic Authentication](https://www.ably.io/documentation/core-features/authentication#basic-authentication), i.e. by using the API Key directly as shown below: 255 | 256 | ```js 257 | const realtime = Ably.Realtime({ 258 | key: ABLY_API_KEY, 259 | echoMessages: false, 260 | }); 261 | ``` 262 | 263 | Note: Setting the `echoMessages` false prevents the server from receiving its own messages. 264 | 265 | The main server thread uses Express to listen to HTTP requests. It has an `/auth` endpoint that is used by the client-side scripts to authenticate with Ably using tokens. This is a recommended strategy as placing your secret API Key in a front-end script exposes it to potential misuse. The client-side scripts connect to Ably using [Token Authentication](https://www.ably.io/documentation/core-features/authentication#token-authentication) as shown below: 266 | 267 | ```js 268 | const realtime = new Ably.Realtime({ 269 | authUrl: '/auth', 270 | }); 271 | ``` 272 | 273 | #### Ably channel names used by this project 274 | 275 | 1. `main-game-thread` - Used by the main server thread to listen for host player entries and leaves via presence, to be able to create new Node JS worker threads for new game rooms. 276 | 277 | 2. `:primary` - Main game state channel for a particular game room. It'll be used by players to enter or leave presence on the game room and by the worker thread to stream game state updates. 278 | 279 | 3. `:player-ch-` - Unique channel for every player, which is used to publish their state (or input) to the worker thread for that unique game room. The worker thread is subscribed to one such channel per player. 280 | 281 | You can also add any other channels that you may need in your game. 282 | 283 | Note: Due to the fact that the above channel names exist in a unique channel namespace identified by the unique room code (separated from channel names with a :), you can guarantee that one game room's data never creeps into the other. 284 | 285 | --- 286 | 287 | ## Data structures 288 | 289 | The game's worker thread (server) stores all the players in an associative array as a key value pair with the following structure: 290 | 291 | ```js 292 | globalPlayersState[ 293 | "" : { 294 | id: "", 295 | nickname: player.data.nickname, 296 | isAlive: true, 297 | isConnected: true, 298 | score: 0, 299 | left: '', 300 | top: '', 301 | color: '', 302 | }, 303 | "" : { 304 | id: "", 305 | nickname: player.data.nickname, 306 | isAlive: false, 307 | isConnected: true, 308 | score: 0, 309 | left: '', 310 | top: '', 311 | color: '', 312 | }, 313 | ] 314 | ``` 315 | 316 | The game's worker thread (server) also keeps a track of all the channels meant for each player's input, so it can attach and detach and from them as needed. This is also stored using an associative array with the following structure: 317 | 318 | ```js 319 | playerChannels[ 320 | '': {''}, 321 | '': {''} 322 | ] 323 | ``` 324 | 325 | The global game state of all the players is published by the game's worker thread (server) at a high frequency to all the players. The payload of this game state has the following structure: 326 | 327 | ```js 328 | gameRoomChannel.publish('game-state', { 329 | globalPlayersState: globalPlayersState, 330 | totalPlayers: totalPlayers, 331 | isGameOn: isGameOn, 332 | isGameOver: isGameOver, 333 | }); 334 | ``` 335 | 336 | The client-side script also stores the game state of each player locally and updates it as per the latest data from the server. This has exactly the same structure as in the server: 337 | 338 | ```js 339 | localGameState[ 340 | "" : { 341 | id: "", 342 | nickname: player.data.nickname, 343 | isAlive: true, 344 | isConnected: true, 345 | score: 0, 346 | left: '', 347 | top: '', 348 | color: '', 349 | }, 350 | "" : { 351 | id: "", 352 | nickname: player.data.nickname, 353 | isAlive: false, 354 | isConnected: true, 355 | score: 0, 356 | left: '', 357 | top: '', 358 | color: '', 359 | }, 360 | ] 361 | ``` 362 | 363 | In the example game, HTML divs represent player bodies, so that is stored in another associative array, the attributes of which are updated as per the latest data in the `localGameState`: 364 | 365 | ```js 366 | playerDivs[ 367 | "" : {''}, 368 | "" : {''} 369 | ] 370 | ``` 371 | 372 | --- 373 | 374 | ## Load tests and limits 375 | 376 | - All of Ably's messaging limits, broken down by package can be found in a [support article](https://support.ably.com/support/solutions/articles/3000053845-do-you-have-any-connection-message-rate-or-other-limits-on-accounts-). 377 | 378 | - We are currently performing load and performance tests on this framework and will update this guide with that info when it's available. If this is important to you, please [leave a message to me directly on Twitter](https://www.twitter.com/Srushtika) 379 | -------------------------------------------------------------------------------- /game-server.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | /** 3 | * This is the game server for 4 | * a single game room 5 | */ 6 | const { parentPort, workerData } = require('worker_threads'); 7 | // eslint-disable-next-line no-unused-vars 8 | const envConfig = require('dotenv').config(); 9 | const Ably = require('ably'); 10 | 11 | const ABLY_API_KEY = process.env.ABLY_API_KEY; 12 | const GAME_STATE_PUBLISH_FREQ_MS = 100; 13 | const PLAYER_GAME_AREA_WIDTH = 790; 14 | const PLAYER_GAME_AREA_HEIGHT = 390; 15 | const globalPlayersState = {}; 16 | const playerChannels = {}; 17 | let isGameOn = false; 18 | let isGameOver = false; 19 | let totalPlayers = 0; 20 | const gameRoomChName = workerData.hostRoomCode + ':primary'; 21 | const roomCode = workerData.hostRoomCode; 22 | const hostClientId = workerData.hostClientId; 23 | let gameRoomChannel; 24 | let gameTickerOn = false; 25 | 26 | // instantiate Ably 27 | // eslint-disable-next-line new-cap 28 | const realtime = Ably.Realtime({ 29 | key: ABLY_API_KEY, 30 | echoMessages: false 31 | }); 32 | 33 | // wait until connection with Ably is established 34 | realtime.connection.once('connected', () => { 35 | // create the channel object 36 | gameRoomChannel = realtime.channels.get(gameRoomChName); 37 | 38 | // subscribe to new players entering the game via 'presence' 39 | gameRoomChannel.presence.subscribe('enter', (player) => { 40 | const newPlayerId = player.clientId; 41 | totalPlayers++; 42 | /** 43 | * let the main thread know the 44 | * updated number of players 45 | */ 46 | parentPort.postMessage({ 47 | roomCode: roomCode, 48 | totalPlayers: totalPlayers, 49 | isGameOn: isGameOn, 50 | isGameOver: isGameOver 51 | }); 52 | 53 | // start publishing game updates as soon as the 54 | // first player joins 55 | if (totalPlayers === 1) { 56 | gameTickerOn = true; 57 | startGameDataTicker(); 58 | } 59 | 60 | // create an initial object for this 61 | // newly joined player 62 | newPlayerState = { 63 | id: newPlayerId, 64 | nickname: player.data.nickname, 65 | isAlive: true, 66 | isConnected: true, 67 | score: 0, 68 | left: Math.round(Math.random() * PLAYER_GAME_AREA_WIDTH + 1), 69 | top: Math.round(Math.random() * PLAYER_GAME_AREA_HEIGHT + 1), 70 | color: randomColorGenerator() 71 | }; 72 | // add the new player's state object to the 73 | // global players state associative array 74 | globalPlayersState[newPlayerId] = newPlayerState; 75 | 76 | // get the unique channel for this player 77 | playerChannels[newPlayerId] = realtime.channels.get( 78 | roomCode + ':player-ch-' + player.clientId 79 | ); 80 | // subscribe to this player's state on their unique channel 81 | subscribeToPlayerState(playerChannels[newPlayerId], newPlayerId); 82 | }); 83 | 84 | // subscribe to players leaving the game via presence 85 | gameRoomChannel.presence.subscribe('leave', (player) => { 86 | const leavingPlayerId = player.clientId; 87 | totalPlayers--; 88 | globalPlayersState[leavingPlayerId].isConnected = false; 89 | /** 90 | * optionally let the main thread know the 91 | * number of players 92 | */ 93 | parentPort.postMessage({ 94 | roomCode: roomCode, 95 | totalPlayers: totalPlayers 96 | }); 97 | 98 | /** 99 | * delete this players entry from the 100 | * associative array after waiting a bit 101 | * to make sure the players have received at least one 102 | * server tick update declaring this player disconnected 103 | */ 104 | setTimeout(() => { 105 | delete globalPlayersState[leavingPlayerId]; 106 | }, GAME_STATE_PUBLISH_FREQ_MS * 2); 107 | 108 | /** 109 | * if it's the last player to leave, kill the woker thread 110 | * aka the game server for this game room 111 | */ 112 | if (totalPlayers <= 0) { 113 | killWorkerThread(); 114 | } 115 | }); 116 | 117 | /** 118 | * let the host player know that the game room 119 | * is ready, so they can enter via presence 120 | * and let other players do so too 121 | * */ 122 | gameRoomChannel.publish('thread-ready', { 123 | start: true 124 | }); 125 | }); 126 | 127 | /** 128 | * method to start the server game ticker 129 | * to continuously stream the global state 130 | * to all the players connected 131 | * */ 132 | function startGameDataTicker() { 133 | const tickInterval = setInterval(() => { 134 | if (!gameTickerOn) { 135 | clearInterval(tickInterval); 136 | } else { 137 | // publish the latest game state 138 | gameRoomChannel.publish('game-state', { 139 | globalPlayersState: globalPlayersState, 140 | totalPlayers: totalPlayers, 141 | isGameOn: isGameOn, 142 | isGameOver: isGameOver 143 | }); 144 | } 145 | }, GAME_STATE_PUBLISH_FREQ_MS); 146 | } 147 | 148 | // subscribe to player channel to get their latest state 149 | function subscribeToPlayerState(playerChannel, playerId) { 150 | // subscribe to the player state event where 151 | // the players will send their state updates 152 | playerChannel.subscribe('player-state', (msg) => { 153 | const { left, top } = msg.data; 154 | const state = globalPlayersState[playerId]; 155 | globalPlayersState[playerId] = { ...state, left, top }; 156 | }); 157 | 158 | // subscribe to the player death event 159 | playerChannel.subscribe('player-dead', (msg) => { 160 | globalPlayersState[msg.data.deadPlayerId].isAlive = false; 161 | }); 162 | // subscribe to events that only the game host can publish 163 | if (playerId === hostClientId) { 164 | playerChannel.subscribe('start-game', (msg) => { 165 | if (!isGameOn) { 166 | isGameOn = true; 167 | parentPort.postMessage({ 168 | roomCode: roomCode, 169 | totalPlayers: totalPlayers, 170 | isGameOn: isGameOn, 171 | isGameOver: isGameOver 172 | }); 173 | } 174 | }); 175 | playerChannel.subscribe('end-game', (msg) => { 176 | if (isGameOn) { 177 | isGameOn = false; 178 | isGameOver = true; 179 | } 180 | }); 181 | } 182 | } 183 | 184 | // kill the worker thread 185 | function killWorkerThread() { 186 | // detach from all the channels to immediately 187 | // bring the active channel count down 188 | for (const item in playerChannels) { 189 | if ({}.hasOwnProperty.call(playerChannels, item)) { 190 | playerChannels[item].detach(); 191 | } 192 | } 193 | gameRoomChannel.detach(); 194 | // publish a message to the main thread befoe this thread exits 195 | parentPort.postMessage({ 196 | killWorker: true, 197 | roomCode: roomCode, 198 | totalPlayers: totalPlayers 199 | }); 200 | process.exit(0); 201 | } 202 | 203 | // method to randomly generate a color for the player 204 | function randomColorGenerator() { 205 | return '#' + Math.random().toString(16).slice(-6); 206 | } 207 | -------------------------------------------------------------------------------- /package-lock.json: 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"ws": { 2986 | "version": "5.2.2", 2987 | "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz", 2988 | "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==", 2989 | "requires": { 2990 | "async-limiter": "~1.0.0" 2991 | } 2992 | } 2993 | } 2994 | } 2995 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "multiplayer-web-game-ably-starter-kit", 3 | "version": "1.0.0", 4 | "description": "This repository contains a starter template for building any realtime multiplayer game on the web with Ably using the client/server architecture. This project uses vanilla JS on the client-side and NodeJS on the server-side", 5 | "main": "server.js", 6 | "scripts": { 7 | "test": "echo \"Error: no test specified\" && exit 1", 8 | "start": "node server.js" 9 | }, 10 | "repository": { 11 | "type": "git", 12 | "url": "git+https://github.com/Srushtika/multiplayer-web-game-ably-starter-kit.git" 13 | }, 14 | "author": "Srushtika Neelakantam", 15 | "license": "ISC", 16 | "bugs": { 17 | "url": "https://github.com/Srushtika/multiplayer-web-game-ably-starter-kit/issues" 18 | }, 19 | "homepage": "https://github.com/Srushtika/multiplayer-web-game-ably-starter-kit#readme", 20 | "dependencies": { 21 | "ably": "^1.2.1", 22 | "dotenv": "^8.2.0", 23 | "express": "^4.17.1" 24 | }, 25 | "devDependencies": { 26 | "eslint": "^7.8.0", 27 | "eslint-config-google": "^0.14.0", 28 | "eslint-config-node": "^4.1.0", 29 | "eslint-config-prettier": "^6.11.0", 30 | "eslint-plugin-node": "^11.1.0", 31 | "eslint-plugin-prettier": "^3.1.4", 32 | "prettier": "^2.1.1" 33 | } 34 | } 35 | -------------------------------------------------------------------------------- /public/js/index.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | 'use strict'; 3 | 4 | /** 5 | * method to create or join a room on button click 6 | */ 7 | // eslint-disable-next-line no-unused-vars 8 | function createOrJoin(action) { 9 | localStorage.clear(); 10 | let roomCode; 11 | const isHost = action === 'create'; 12 | const nickname = document.getElementById(action + '-nickname').value; 13 | if (isHost) { 14 | roomCode = getRandomRoomId(); 15 | } else { 16 | roomCode = document.getElementById('join-room-code').value; 17 | } 18 | localStorage.setItem('isHost', isHost); 19 | localStorage.setItem('nickname', nickname); 20 | localStorage.setItem('roomCode', roomCode); 21 | window.location.replace('/game?roomCode=' + roomCode + '&isHost=' + isHost); 22 | } 23 | 24 | // method to generate a random room Id 25 | function getRandomRoomId() { 26 | return 'room-' + Math.random().toString(36).substr(2, 8); 27 | } 28 | -------------------------------------------------------------------------------- /public/js/modules/renderUpdates.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | 'use strict'; 3 | const playerDivs = {}; 4 | const gameAreaParentDiv = document.getElementById('game-area'); 5 | 6 | // method to update the game display 7 | function updateGameDisplay( 8 | localGameState, 9 | myGameRoomCode, 10 | myClientId, 11 | myNickname, 12 | amIHost 13 | ) { 14 | // loop through all the players in the local game state 15 | // associative array and create or move their block as per their latest positon 16 | for (const item in localGameState) { 17 | if (!playerDivs[item] && localGameState[item].isAlive) { 18 | playerDivs[item] = {}; 19 | playerDivs[item].el = document.createElement('div'); 20 | playerDivs[item].el.classList.add('player-block'); 21 | gameAreaParentDiv.appendChild(playerDivs[item].el); 22 | playerDivs[item].el.style.left = localGameState[item].left + 'px'; 23 | playerDivs[item].el.style.top = localGameState[item].top + 'px'; 24 | playerDivs[item].el.style.backgroundColor = localGameState[item].color; 25 | if (item === myClientId) { 26 | document.getElementById( 27 | 'player-color-indicator' 28 | ).style.backgroundColor = localGameState[item].color; 29 | document.getElementById('player-room-info').innerHTML = 30 | '  in “' + 31 | myGameRoomCode + 32 | '” with clientId “' + 33 | myClientId + 34 | '” and nickname “' + 35 | myNickname + 36 | '”'; 37 | } 38 | } else if (playerDivs[item]) { 39 | playerDivs[item].el.style.left = localGameState[item].left + 'px'; 40 | playerDivs[item].el.style.top = localGameState[item].top + 'px'; 41 | } 42 | } 43 | } 44 | 45 | // method to add presence updates to a list 46 | function updatePresenceList(playerNickname, update, amIHost, totalPlayers) { 47 | const listItem = `
  • ${playerNickname} ${update}
    • `; 48 | if (amIHost) { 49 | const listEl = document.getElementById('host-players-list'); 50 | listEl.innerHTML += listItem; 51 | listEl.scrollTop = listEl.scrollHeight; 52 | document.getElementById('player-count').innerHTML = 53 | totalPlayers + ' player(s) online including you'; 54 | } else { 55 | const listEl = document.getElementById('not-host-players-list'); 56 | listEl.innerHTML += listItem; 57 | listEl.scrollTop = listEl.scrollHeight; 58 | } 59 | } 60 | 61 | // method to add game updates to a list 62 | function updateGameNewsList(playerNickname, update) { 63 | const listItem = `
  • ${playerNickname} ${update}
    • `; 64 | const listEl = document.getElementById('game-updates-list'); 65 | listEl.innerHTML += listItem; 66 | listEl.scrollTop = listEl.scrollHeight; 67 | } 68 | 69 | // method to add a blink effect adn remove the player from the game area 70 | // and the associative array 71 | function blinkAndRemovePlayer(playerId) { 72 | let blinkCount = 0; 73 | const blinkInterval = setInterval(function () { 74 | if (blinkCount >= 5) { 75 | gameAreaParentDiv.removeChild(playerDivs[playerId].el); 76 | delete playerDivs[playerId]; 77 | clearInterval(blinkInterval); 78 | } else { 79 | playerDivs[playerId].el.style.display = 80 | playerDivs[playerId].el.style.display === 'none' ? '' : 'none'; 81 | blinkCount++; 82 | } 83 | }, 250); 84 | } 85 | 86 | function showGameArea(amIHost) { 87 | if (amIHost) { 88 | document.getElementById('host-waiting').style.display = 'none'; 89 | document.getElementById('host-gameplay').style.display = 'block'; 90 | } else { 91 | document.getElementById('not-host-waiting').style.display = 'none'; 92 | document.getElementById('not-host-gameplay').style.display = 'block'; 93 | } 94 | } 95 | 96 | function showEndGameAlert(amIHost) { 97 | amIHost === true 98 | ? (document.getElementById('alert-host').style.display = 'block') 99 | : (document.getElementById('alert-not-host').style.display = 'block'); 100 | } 101 | 102 | function showRoomCodeToShare(roomCode) { 103 | const roomNotReadyDiv = document.getElementById('room-not-ready'); 104 | roomNotReadyDiv.style.display = 'none'; 105 | const roomReadyDiv = document.getElementById('room-ready'); 106 | roomReadyDiv.style.display = 'block'; 107 | document.getElementById('random-room-code').innerHTML = roomCode; 108 | } 109 | 110 | export { 111 | updateGameDisplay, 112 | updatePresenceList, 113 | updateGameNewsList, 114 | blinkAndRemovePlayer, 115 | showGameArea, 116 | showEndGameAlert, 117 | showRoomCodeToShare 118 | }; 119 | -------------------------------------------------------------------------------- /public/js/modules/utils.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | 'use strict'; 3 | 4 | const PLAYER_GAME_AREA_WIDTH = 800; 5 | const PLAYER_GAME_AREA_HEIGHT = 400; 6 | 7 | function calculateAndMovePlayer(e, myLeft, myTop) { 8 | let playerMove = false; 9 | switch (e.keyCode) { 10 | case 37: // leftArrowKey 11 | if (myLeft >= 20) { 12 | myLeft -= 20; 13 | playerMove = true; 14 | } 15 | break; 16 | case 39: // rightArrowKey 17 | if (myLeft <= PLAYER_GAME_AREA_WIDTH - 20) { 18 | myLeft += 20; 19 | playerMove = true; 20 | } 21 | break; 22 | case 38: // upArrowKey 23 | if (myTop >= 20) { 24 | myTop -= 20; 25 | playerMove = true; 26 | } 27 | break; 28 | case 40: // downArrowKey 29 | if (myTop <= PLAYER_GAME_AREA_HEIGHT - 20) { 30 | myTop += 20; 31 | playerMove = true; 32 | } 33 | break; 34 | } 35 | 36 | return [playerMove, myLeft, myTop]; 37 | } 38 | 39 | export { calculateAndMovePlayer }; 40 | -------------------------------------------------------------------------------- /public/js/player.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | 'use strict'; 3 | import * as renderModule from './modules/renderUpdates.js'; 4 | import * as utilsModule from './modules/utils.js'; 5 | 6 | const playerVars = { 7 | myClientId: '', 8 | localGameState: {}, 9 | isGameOn: false, 10 | totalPlayers: 1, 11 | endGameClicked: false, 12 | myNickname: localStorage.getItem('nickname'), 13 | myGameRoomCode: localStorage.getItem('roomCode'), 14 | amIHost: localStorage.getItem('isHost') === 'true' 15 | }; 16 | 17 | const channelNames = { 18 | myPublishChName: '', 19 | globalChName: '', 20 | myGameRoomChName: playerVars.myGameRoomCode + ':primary' 21 | }; 22 | 23 | const channelInstances = { 24 | myPublishChannel: '', 25 | myGameRoomChannel: '', 26 | globalChannel: '' 27 | }; 28 | 29 | window.copyCode = copyCode; 30 | window.startGame = startGame; 31 | window.endGame = endGame; 32 | window.fakeDeath = fakeDeath; 33 | 34 | document.addEventListener('keydown', move); 35 | 36 | // instantiate the Ably library 37 | // authenticate via Token Auth strategy 38 | const realtime = new Ably.Realtime({ 39 | authUrl: '/auth' 40 | }); 41 | 42 | // wait until connection with Ably is established 43 | realtime.connection.once('connected', () => { 44 | // save the current players clientId 45 | playerVars.myClientId = realtime.auth.clientId; 46 | // call a method to attach to channels 47 | attachChannels(); 48 | 49 | // request a new worker thread or enter existing 50 | if (playerVars.amIHost) { 51 | waitForGameRoom(); 52 | enterMainThread(); 53 | } else { 54 | enterGameRoom(); 55 | } 56 | receiveGlobalGameState(); 57 | }); 58 | 59 | // method to attach to channels 60 | function attachChannels() { 61 | // channel to publish player input 62 | channelNames.myPublishChName = 63 | playerVars.myGameRoomCode + ':player-ch-' + playerVars.myClientId; 64 | channelInstances.myPublishChannel = realtime.channels.get( 65 | channelNames.myPublishChName 66 | ); 67 | // channel to receive global game state updates 68 | channelInstances.myGameRoomChannel = realtime.channels.get( 69 | channelNames.myGameRoomChName 70 | ); 71 | } 72 | 73 | // method to wait for the worker thread to be ready 74 | function waitForGameRoom() { 75 | channelInstances.myGameRoomChannel.subscribe('thread-ready', (msg) => { 76 | channelInstances.globalChannel.detach(); 77 | enterGameRoom(); 78 | renderModule.showRoomCodeToShare(playerVars.myGameRoomCode); 79 | }); 80 | } 81 | 82 | // method to enter presence on the main server thread (for hosts only) 83 | function enterMainThread() { 84 | channelNames.globalChName = 'main-game-thread'; 85 | channelInstances.globalChannel = realtime.channels.get( 86 | channelNames.globalChName 87 | ); 88 | channelInstances.globalChannel.presence.enter({ 89 | nickname: playerVars.myNickname, 90 | roomCode: playerVars.myGameRoomCode, 91 | isHost: playerVars.amIHost 92 | }); 93 | } 94 | 95 | // method to enter presence on the game server worker thread (for all players) 96 | function enterGameRoom() { 97 | channelInstances.myGameRoomChannel.presence.enter({ 98 | nickname: playerVars.myNickname, 99 | isHost: playerVars.amIHost 100 | }); 101 | } 102 | 103 | // method to subscribe to global game state updates from game server 104 | function receiveGlobalGameState() { 105 | channelInstances.myGameRoomChannel.subscribe('game-state', (msg) => { 106 | if (msg.data.isGameOn && !playerVars.isGameOn) { 107 | renderModule.showGameArea(playerVars.amIHost); 108 | playerVars.isGameOn = true; 109 | } 110 | if (!msg.data.isGameOver) { 111 | updateLocalState(msg.data); 112 | } else { 113 | endGameAndCleanup(msg.data.isGameOn); 114 | } 115 | }); 116 | } 117 | 118 | // method to update local variables based on the update received from the server 119 | function updateLocalState(msgData) { 120 | playerVars.totalPlayers = msgData.totalPlayers; 121 | for (const item in msgData.globalPlayersState) { 122 | if ( 123 | playerVars.localGameState[item] && 124 | msgData.globalPlayersState[item].isConnected 125 | ) { 126 | handlePlayerStateUpdate(msgData.globalPlayersState[item], item); 127 | } else if ( 128 | playerVars.localGameState[item] && 129 | !msgData.globalPlayersState[item].isConnected 130 | ) { 131 | handleExistingPlayerLeft( 132 | msgData.data.globalPlayersState[item].nickname, 133 | item 134 | ); 135 | } else if ( 136 | !playerVars.localGameState[item] && 137 | msgData.globalPlayersState[item].isConnected 138 | ) { 139 | handleNewPlayerJoined(msgData.globalPlayersState[item], item); 140 | } 141 | } 142 | 143 | // call a method to update the game display as per latest state 144 | renderModule.updateGameDisplay( 145 | playerVars.localGameState, 146 | playerVars.myGameRoomCode, 147 | playerVars.myClientId, 148 | playerVars.myNickname, 149 | playerVars.amIHost 150 | ); 151 | } 152 | 153 | // method to end the game and detach from channels 154 | function endGameAndCleanup(isGlobalGameOn) { 155 | if (!isGlobalGameOn && playerVars.isGameOn) { 156 | renderModule.showEndGameAlert(playerVars.amIHost); 157 | channelInstances.myGameRoomChannel.detach(); 158 | channelInstances.myPublishChannel.detach(); 159 | realtime.connection.close(); 160 | // redirect to the homepage after a bit 161 | setTimeout(() => { 162 | if (!playerVars.endGameClicked) { 163 | window.location.replace('/?restart'); 164 | } 165 | playerVars.endGameClicked = true; 166 | }, 3000); 167 | } 168 | } 169 | 170 | // method to update the UI as per player state 171 | function handlePlayerStateUpdate(globalState, playerId) { 172 | const { isAlive, nickname } = globalState; 173 | if (isAlive) { 174 | playerVars.localGameState[playerId] = { 175 | ...globalState 176 | }; 177 | } else if (!isAlive && playerVars.localGameState[playerId].isAlive) { 178 | playerVars.localGameState[playerId].isAlive = false; 179 | renderModule.updateGameNewsList(nickname, 'died'); 180 | renderModule.blinkAndRemovePlayer(playerId); 181 | } 182 | } 183 | 184 | // method to handle a player leaving the game 185 | function handleExistingPlayerLeft(nickname, playerId) { 186 | renderModule.blinkAndRemovePlayer(playerId); 187 | if (!playerVars.isGameOn) { 188 | renderModule.updatePresenceList( 189 | nickname, 190 | 'left', 191 | playerVars.amIHost, 192 | playerVars.totalPlayers 193 | ); 194 | } else { 195 | renderModule.updateGameNewsList(nickname, 'left'); 196 | } 197 | delete playerVars.localGameState[playerId]; 198 | } 199 | 200 | // method to handle a new player joining the game 201 | function handleNewPlayerJoined(newPlayerState, playerId) { 202 | // create a new entry for this player and copy the latest state from the server 203 | playerVars.localGameState[playerId] = { ...newPlayerState }; 204 | // update the presence list 205 | renderModule.updatePresenceList( 206 | newPlayerState.nickname, 207 | 'joined', 208 | playerVars.amIHost, 209 | playerVars.totalPlayers 210 | ); 211 | } 212 | 213 | // method to handle keydown events 214 | function move(e) { 215 | const playerPosition = utilsModule.calculateAndMovePlayer( 216 | e, 217 | playerVars.localGameState[playerVars.myClientId].left, 218 | playerVars.localGameState[playerVars.myClientId].top 219 | ); 220 | if (playerPosition[0]) { 221 | channelInstances.myPublishChannel.publish('player-state', { 222 | left: playerPosition[1], 223 | top: playerPosition[2] 224 | }); 225 | } 226 | } 227 | 228 | // method to start the game 229 | // only game hosts have this button 230 | function startGame() { 231 | channelInstances.myPublishChannel.publish('start-game', { 232 | startGame: true 233 | }); 234 | } 235 | 236 | // method to end the game 237 | // only game hosts have this button 238 | function endGame() { 239 | channelInstances.myPublishChannel.publish('end-game', { 240 | endGame: true 241 | }); 242 | } 243 | 244 | // method to fake death 245 | // all players have this button 246 | function fakeDeath() { 247 | channelInstances.myPublishChannel.publish('player-dead', { 248 | deadPlayerId: playerVars.myClientId 249 | }); 250 | } 251 | 252 | // method to copy the room code to clipboard on button click 253 | function copyCode() { 254 | navigator.clipboard.writeText(playerVars.myGameRoomCode); 255 | } 256 | -------------------------------------------------------------------------------- /public/views/game-code-wrong.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 9 | 10 | 16 | 17 | Wrong game room 18 | 19 | 20 |

    This game room doesn't exist 🌚

    21 | 22 | 23 | 28 | 29 | -------------------------------------------------------------------------------- /public/views/game-host.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 10 | 11 | 12 | 18 | 24 | 25 | 26 | My multiplayer game 27 | 28 | 32 | 33 | 34 | 35 | 38 |
    39 |
    40 |
    41 |
    42 |
    You are the host
    43 |
    44 |

    Creating your unique game room...

    45 |
    46 |
    47 |

    48 | Being the host gives you the control to start this game. 49 |

    50 |

    Share this room code to let others join

    51 |
    52 |

    53 | 56 |
    57 |

    58 | As the other players join, they will appear on the right. You 59 | can wait until all expected players are in, then start the game. 60 |

    61 | 64 |
    65 |
    66 | 1 player(s) online including you 67 |
    68 |
    69 |
    70 |
    71 |
    72 |
    Players' join / leave updates
    73 |
      77 |
      78 |
      79 |
      80 |
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      84 |

      You are

      85 |
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      89 |
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      91 | 92 |

      Use arrow keys to move your block around the game area

      93 |
      94 |
      95 | 98 | 101 |
      102 |
      103 |
      Game updates
      104 |
        108 |
        109 |
        110 | 111 | 112 | 113 | 118 | 123 | 128 | 129 | 130 | -------------------------------------------------------------------------------- /public/views/game-not-host.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 10 | 11 | 12 | 13 | 19 | 20 | 21 | My multiplayer game 22 | 23 | 27 | 28 | 29 | 30 | 33 |
        34 |
        35 |
        36 |
        37 | You're in! Waiting for the host to start the game... 38 |
        39 |
        40 | Players' join / leave updates 41 |
        42 |
          46 |
          47 |
          48 |
          49 |
          50 |
          51 |
          52 |

          You are

          53 |
          54 |
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          57 |
          58 |
          59 | 60 |

          Use arrow keys to move your block around the game area

          61 |
          62 |
          63 | 66 |
          67 |
          68 |
          Game updates
          69 |
            73 |
            74 |
            75 | 76 | 77 | 78 | 83 | 88 | 93 | 94 | 95 | -------------------------------------------------------------------------------- /public/views/game-started.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 9 | 10 | 16 | 17 | Game started 18 | 19 | 20 |

            Snoozers losers, this game has already started, sorry! ⏱

            21 | 22 | 23 | 28 | 29 | -------------------------------------------------------------------------------- /public/views/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 9 | 10 | 16 | 22 | 23 | 24 | My multiplayer game 25 | 26 | 27 |
            28 |
            29 |

            30 | Multiplayer web game starter kit 31 |

            32 |

            powered by Ably Realtime

            33 |
            34 |
            35 |
            36 |
            37 | 63 |
            64 |
            70 |
            71 |
            72 | 78 |
            79 | 86 |
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            125 | 126 | 127 | 128 | 133 | 138 | 143 | 144 | 145 | 146 | -------------------------------------------------------------------------------- /public/views/style.css: -------------------------------------------------------------------------------- 1 | body { 2 | background-color: #f5f5f5; 3 | text-align: center; 4 | } 5 | 6 | h1 { 7 | margin: 80px 0px 20px 0px; 8 | } 9 | 10 | h4 { 11 | margin-bottom: 50px; 12 | } 13 | 14 | input { 15 | text-align: center; 16 | } 17 | 18 | .content { 19 | text-align: center; 20 | } 21 | 22 | .card-flex { 23 | justify-content: center; 24 | } 25 | 26 | .container { 27 | width: 50%; 28 | text-align: center; 29 | } 30 | 31 | .room-input { 32 | display: inline-block; 33 | width: 50%; 34 | padding: 20px; 35 | text-align: center; 36 | } 37 | 38 | .random-code { 39 | padding: 2px 10px 10px 10px; 40 | display: flex; 41 | justify-content: center; 42 | } 43 | 44 | .copy { 45 | color: #0069d9; 46 | } 47 | 48 | .copy:hover { 49 | color: black; 50 | } 51 | 52 | .copy:active { 53 | color: gray; 54 | } 55 | 56 | .host-game { 57 | display: flex; 58 | width: 100%; 59 | } 60 | 61 | .room-ready { 62 | display: none; 63 | } 64 | 65 | .host-info { 66 | width: 50%; 67 | margin: 180px 90px; 68 | } 69 | 70 | .player-info { 71 | width: 50%; 72 | margin: 150px 90px; 73 | } 74 | 75 | .players-list { 76 | height: 440px; 77 | max-height: 440px; 78 | overflow-y: auto; 79 | } 80 | 81 | .not-host-game { 82 | width: 100%; 83 | } 84 | 85 | .waiting { 86 | width: 50%; 87 | margin: 150px auto; 88 | max-height: 440px; 89 | } 90 | 91 | .host-gameplay { 92 | display: none; 93 | } 94 | 95 | .not-host-gameplay { 96 | display: none; 97 | } 98 | 99 | .game-area { 100 | display: inline-block; 101 | width: 800px; 102 | height: 400px; 103 | padding: 20px; 104 | margin: 40px; 105 | text-align: center; 106 | position: relative; 107 | } 108 | 109 | .player-color-block { 110 | width: 10px; 111 | height: 10px; 112 | } 113 | 114 | .player-block { 115 | width: 10px; 116 | height: 10px; 117 | position: absolute; 118 | } 119 | 120 | .player-color { 121 | display: flex; 122 | justify-content: center; 123 | align-items: baseline; 124 | margin: 40px auto 5px auto; 125 | } 126 | 127 | .player-text { 128 | padding-right: 10px; 129 | } 130 | 131 | #alert-host { 132 | display: none; 133 | } 134 | 135 | #alert-not-host { 136 | display: none; 137 | } 138 | 139 | .game-updates-list { 140 | height: 150px; 141 | max-height: 440px; 142 | overflow-y: auto; 143 | } 144 | 145 | .game-updates-card { 146 | width: 50%; 147 | margin: 60px auto; 148 | max-height: 180px; 149 | } 150 | -------------------------------------------------------------------------------- /server.js: -------------------------------------------------------------------------------- 1 | /* eslint-disable require-jsdoc */ 2 | /** 3 | * This is the main server file, responsible for three operations: 4 | * 1. Server the HTML/JS files to the players 5 | * 2. Serve as an auth server to authenticate front-end clients 6 | * with Ably and assign a unique clientId to each player 7 | * 3. Create a new worker thread for each game room using NodeJS worker threads 8 | */ 9 | const { Worker, isMainThread, threadId } = require('worker_threads'); 10 | // eslint-disable-next-line no-unused-vars 11 | const envConfig = require('dotenv').config(); 12 | const express = require('express'); 13 | const Ably = require('ably'); 14 | 15 | const app = express(); 16 | const ABLY_API_KEY = process.env.ABLY_API_KEY; 17 | const globalGameChName = 'main-game-thread'; 18 | 19 | let globalChannel; 20 | const activeGameRooms = {}; 21 | let totalPlayersThroughout = 0; 22 | 23 | // instantiate the Ably library 24 | // eslint-disable-next-line new-cap 25 | const realtime = Ably.Realtime({ 26 | key: ABLY_API_KEY, 27 | // echo messages client option is true by default 28 | // making it false will prevent the server from 29 | // receiving the messages published by it 30 | echoMessages: false 31 | }); 32 | 33 | app.use(express.static('public')); 34 | 35 | /** 36 | * the auth endpoint will allow front end clients to 37 | * authenticate with Ably using Token auth 38 | */ 39 | app.get('/auth', (request, response) => { 40 | // assign each front-end client a unique clientId 41 | const tokenParams = { clientId: uniqueId() }; 42 | realtime.auth.createTokenRequest(tokenParams, function (err, tokenRequest) { 43 | if (err) { 44 | response 45 | .status(500) 46 | .send('Error requesting token: ' + JSON.stringify(err)); 47 | } else { 48 | // return the token request to the front-end client 49 | response.setHeader('Content-Type', 'application/json'); 50 | response.send(JSON.stringify(tokenRequest)); 51 | } 52 | }); 53 | }); 54 | 55 | // create a uniqueId to assign to clients on auth 56 | const uniqueId = function () { 57 | return 'id-' + Math.random().toString(36).substr(2, 16); 58 | }; 59 | 60 | // show the index.html file on the home page 61 | app.get('/', (request, response) => { 62 | response.sendFile(__dirname + '/public/views/index.html'); 63 | }); 64 | 65 | // show the game html page to the client 66 | app.get('/game', (request, response) => { 67 | const requestedRoomCode = request.query.roomCode; 68 | const isReqHost = request.query.isHost === 'true'; 69 | /** 70 | * check if the requested game room exists 71 | * and if the client is a host or not, 72 | * and serve the HTML files accordingly 73 | * */ 74 | if (!isReqHost && activeGameRooms[requestedRoomCode]) { 75 | if (!activeGameRooms[requestedRoomCode].isGameOn) { 76 | response.sendFile(__dirname + '/public/views/game-not-host.html'); 77 | } else { 78 | response.sendFile(__dirname + '/public/views/game-started.html'); 79 | } 80 | } else if (isReqHost) { 81 | response.sendFile(__dirname + '/public/views/game-host.html'); 82 | } else { 83 | response.sendFile(__dirname + '/public/views/game-code-wrong.html'); 84 | } 85 | }); 86 | 87 | // add a listener for the express server 88 | const listener = app.listen(process.env.PORT, () => { 89 | console.log('Your app is listening on port ' + listener.address().port); 90 | }); 91 | 92 | // wait until connection with Ably is established 93 | realtime.connection.once('connected', () => { 94 | // create the channel object 95 | globalChannel = realtime.channels.get(globalGameChName); 96 | // subscribe to new host players entering the game 97 | globalChannel.presence.subscribe('enter', (player) => { 98 | // generate a new worker thread for each game room 99 | generateNewGameThread( 100 | player.data.isHost, 101 | player.data.nickname, 102 | player.data.roomCode, 103 | player.clientId 104 | ); 105 | }); 106 | }); 107 | 108 | // method to create and update a new worker thread 109 | function generateNewGameThread( 110 | isHost, 111 | hostNickname, 112 | hostRoomCode, 113 | hostClientId 114 | ) { 115 | if (isHost && isMainThread) { 116 | const worker = new Worker('./game-server.js', { 117 | workerData: { 118 | hostNickname: hostNickname, 119 | hostRoomCode: hostRoomCode, 120 | hostClientId: hostClientId 121 | } 122 | }); 123 | console.log(`CREATING NEW THREAD WITH ID ${threadId}`); 124 | worker.on('error', (error) => { 125 | console.log(`WORKER EXITED DUE TO AN ERROR ${error}`); 126 | }); 127 | // wait for an update from the worker thread to confirm it's created 128 | worker.on('message', (msg) => { 129 | if (msg.roomCode && !msg.killWorker) { 130 | // save all live threads in an associative array 131 | activeGameRooms[msg.roomCode] = { 132 | roomCode: msg.roomCode, 133 | totalPlayers: msg.totalPlayers, 134 | isGameOn: msg.isGameOn 135 | }; 136 | totalPlayersThroughout += totalPlayersThroughout; 137 | } else if (msg.roomCode && msg.killWorker) { 138 | // delete the thread entry from the associative array 139 | // if the killWorker method was invoked in the thread 140 | totalPlayersThroughout -= msg.totalPlayers; 141 | delete activeGameRooms[msg.roomCode]; 142 | } 143 | }); 144 | // check if any error occurs when a worker thread quits 145 | worker.on('exit', (code) => { 146 | console.log(`WORKER EXITED WITH THREAD ID ${threadId}`); 147 | if (code !== 0) { 148 | console.log(`WORKER EXITED DUE TO AN ERROR WITH CODE ${code}`); 149 | } 150 | }); 151 | } 152 | } 153 | --------------------------------------------------------------------------------