Consolidated the server into the project

Added npm scripts to build and launch the whole project

README.md

@@ -0,0 +1,16 @@
+# HTML Canvas with WebSocket
+
+## About
+
+This is a demo app that allows you to draw on an HTML canvas. Everythng that gets drawn will be
+transmitted to a server using websocket and displayed by a receiver app.
+
+## Dependencies
+
+This app needs Node.js and npm to build and run.
+
+## Running the app
+
+Open the command line in the project directory and run ```npm run launch```
+
+Then open your browser and navigate to http://localhost:8080.

package.json

@@ -8,7 +8,9 @@
     "watch": "tsc -watch -p ./",
     "serve": "serve -l 8080 .",
     "debug": "npm-run-all --parallel watch serve",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "run-server": "cd server && npm run launch",
+    "launch": "npm-run-all --parallel run-server build serve"
   },
   "author": "",
   "license": "ISC",

server/.gitignore

@@ -0,0 +1,102 @@
+dist/
+
+node_modules/
+.node_modules/
+built/*
+tests/cases/rwc/*
+tests/cases/test262/*
+tests/cases/perf/*
+!tests/cases/webharness/compilerToString.js
+test-args.txt
+~*.docx
+\#*\#
+.\#*
+tests/baselines/local/*
+tests/baselines/local.old/*
+tests/services/baselines/local/*
+tests/baselines/prototyping/local/*
+tests/baselines/rwc/*
+tests/baselines/test262/*
+tests/baselines/reference/projectOutput/*
+tests/baselines/local/projectOutput/*
+tests/baselines/reference/testresults.tap
+tests/services/baselines/prototyping/local/*
+tests/services/browser/typescriptServices.js
+src/harness/*.js
+src/compiler/diagnosticInformationMap.generated.ts
+src/compiler/diagnosticMessages.generated.json
+src/parser/diagnosticInformationMap.generated.ts
+src/parser/diagnosticMessages.generated.json
+rwc-report.html
+*.swp
+build.json
+*.actual
+tests/webTestServer.js
+tests/webTestServer.js.map
+tests/webhost/*.d.ts
+tests/webhost/webtsc.js
+tests/cases/**/*.js
+!tests/cases/docker/*.js/
+tests/cases/**/*.js.map
+*.config
+scripts/eslint/built/
+scripts/debug.bat
+scripts/run.bat
+scripts/word2md.js
+scripts/buildProtocol.js
+scripts/ior.js
+scripts/authors.js
+scripts/configurePrerelease.js
+scripts/configureLanguageServiceBuild.js
+scripts/open-user-pr.js
+scripts/open-cherry-pick-pr.js
+scripts/processDiagnosticMessages.d.ts
+scripts/processDiagnosticMessages.js
+scripts/produceLKG.js
+scripts/importDefinitelyTypedTests/importDefinitelyTypedTests.js
+scripts/generateLocalizedDiagnosticMessages.js
+scripts/request-pr-review.js
+scripts/*.js.map
+scripts/typings/
+coverage/
+internal/
+**/.DS_Store
+.settings
+**/.vs
+**/.vscode/*
+!**/.vscode/tasks.json
+!**/.vscode/settings.template.json
+!**/.vscode/launch.template.json
+!**/.vscode/extensions.json
+!tests/cases/projects/projectOption/**/node_modules
+!tests/cases/projects/NodeModulesSearch/**/*
+!tests/baselines/reference/project/nodeModules*/**/*
+.idea
+yarn.lock
+yarn-error.log
+.parallelperf.*
+tests/cases/user/*/package-lock.json
+tests/cases/user/*/node_modules/
+tests/cases/user/*/**/*.js
+tests/cases/user/*/**/*.js.map
+tests/cases/user/*/**/*.d.ts
+!tests/cases/user/zone.js/
+!tests/cases/user/bignumber.js/
+!tests/cases/user/discord.js/
+tests/baselines/reference/dt
+.failed-tests
+TEST-results.xml
+package-lock.json
+tests/cases/user/npm/npm
+tests/cases/user/TypeScript-React-Starter/TypeScript-React-Starter
+tests/cases/user/TypeScript-Node-Starter/TypeScript-Node-Starter
+tests/cases/user/TypeScript-React-Native-Starter/TypeScript-React-Native-Starter
+tests/cases/user/TypeScript-Vue-Starter/TypeScript-Vue-Starter
+tests/cases/user/TypeScript-WeChat-Starter/TypeScript-WeChat-Starter
+tests/cases/user/create-react-app/create-react-app
+tests/cases/user/fp-ts/fp-ts
+tests/cases/user/webpack/webpack
+tests/cases/user/puppeteer/puppeteer
+tests/cases/user/axios-src/axios-src
+tests/cases/user/prettier/prettier
+.eslintcache

server/package.json

@@ -0,0 +1,17 @@
+{
+  "scripts": {
+    "build": "npm install && tsc -p ./",
+    "start": "node dist/app.js",
+    "launch": "npm-run-all build start"
+  },
+  "devDependencies": {
+    "@tsconfig/node16": "^1.0.2",
+    "@types/node": "^16.7.1",
+    "@types/ws": "^7.4.7",
+    "npm-run-all": "^4.1.5",
+    "typescript": "^4.3.5"
+  },
+  "dependencies": {
+    "ws": "^8.2.0"
+  }
+}

server/ts/app.ts

@@ -0,0 +1,102 @@
+import WebSocket from 'ws';
+import Coordinates from './coordinates';
+
+const wss = new WebSocket.Server({ port: 8081 });
+const receivers: WebSocket[] = [];
+let sender: WebSocket | null = null;
+
+const paths = [] as Coordinates[][];
+
+let currentPath = [] as Coordinates[];
+
+wss.on('connection', ws => {
+    console.log('CONNECTION incoming');
+    ws.once('message', message => {
+        const str = message.toString();
+        switch (str) {
+            case 'SENDER':
+                setSender(ws);
+                break;
+            case 'RECEIVER':
+                addReceiver(ws)
+                break;
+            default:
+                console.log('Unknown register code: ' + str);
+                break;
+        }
+    });
+});
+
+console.log('READY');
+
+function addReceiver(ws: WebSocket) {
+    console.log('RECEIVER registered');
+    for (const path of paths) {
+        ws.send('START');
+        path.forEach(c => ws.send(JSON.stringify(c)));
+        ws.send('STOP');
+    }
+
+    receivers.push(ws);
+
+    ws.onclose = () => {
+        // Remove receiver when connection closes
+        for (const [i, recv] of receivers.entries()) {
+            if (ws === recv) {
+                receivers.splice(i, 1);
+            }
+        }
+    };
+}
+
+function setSender(ws: WebSocket) {
+    console.log('SENDER is being registered')
+    if (sender) {
+        console.log('Removing current sender...')
+        sender.close();
+        clearPaths();
+    }
+
+    sender = ws;
+    ws.on('message', msg => processMessage(msg));
+}
+
+function processMessage(message: WebSocket.Data) {
+    const text = message.toString();
+    switch (text) {
+        case 'START':
+            startPath();
+            break;
+        case 'STOP':
+            finishPath();
+            break;
+        default:
+            processCoordinates(text);
+            break;
+    }
+}
+
+function processCoordinates(text: string) {
+    console.log('COORDINATES received: ' + text);
+
+    console.log('SENDING to ' + receivers.length, 'clients');
+    receivers.forEach(r => r.send(text));
+
+    currentPath.push(JSON.parse(text));
+}
+
+function startPath() {
+    currentPath = [];
+    receivers.forEach(r => r.send('START'));
+}
+
+function finishPath() {
+    paths.push(currentPath);
+    receivers.forEach(r => r.send("STOP"));
+}
+
+function clearPaths() {
+    paths.splice(0, paths.length);
+    receivers.forEach(r => r.send('CLEAR'));
+    console.log('Paths have been cleared');
+}

server/ts/coordinates.ts

@@ -0,0 +1,9 @@
+export default class Coordinates {
+    public x: number;
+    public y: number;
+
+    constructor(x: number, y: number) {
+        this.x = x;
+        this.y = y;
+    }
+}

server/tsconfig.json

@@ -0,0 +1,10 @@
+{
+    "extends": "@tsconfig/node16/tsconfig.json",
+    "compilerOptions": {
+      "sourceMap": true,
+      "outDir": "dist",
+      "moduleResolution": "node"
+    },
+    "include": ["ts/**/*"],
+    "exclude": ["node_modules", "**/*.spec.ts"]
+}

ts/canvasReceiver.ts

@@ -1,8 +1,8 @@
 import CanvasUtil from './canvas-util/canvasUtil.js';
 import Coordinates from './canvas-util/coordinates.js';
+import { getWebsocketUrl } from "./websocket/websocket.js";
 
 class CanvasReceiverController {
-    private canvas!: HTMLCanvasElement;
     private canvasDiv: HTMLDivElement;
     private canvasUtil: CanvasUtil;
     private ws: WebSocket;
@@ -23,7 +23,7 @@ class CanvasReceiverController {
             alert('Canvas API unavailable, drawing will not work!');
         }
 
-        this.ws = new WebSocket('ws://localhost:8081', 'json');
+        this.ws = new WebSocket(getWebsocketUrl(), 'json');
 
         this.ws.onmessage = message => this.processMessage(message);
         this.ws.onopen = () => this.ws.send('RECEIVER');

ts/canvasSender.ts

@@ -1,5 +1,6 @@
 import CanvasUtil from "./canvas-util/canvasUtil.js";
 import Coordinates from "./canvas-util/coordinates.js";
+import { getWebsocketUrl } from "./websocket/websocket.js";
 
 class CanvasSenderController {
     private canvasUtil: CanvasUtil;
@@ -28,7 +29,7 @@ class CanvasSenderController {
             canvas.addEventListener('touchmove', e => this.onMouseMove(e.touches[0]));
         }
 
-        this.ws = new WebSocket('ws://localhost:8081', 'json');
+        this.ws = new WebSocket(getWebsocketUrl(), 'json');
         this.ws.onopen = () => this.ws.send('SENDER');
     }
 

ts/websocket/websocket.ts

@@ -0,0 +1,9 @@
+export function getWebsocketUrl(): string {
+    let scheme = 'ws';
+
+    if (document.location.protocol === 'https:') {
+        scheme += 's';
+    }
+
+    return scheme + '://' + document.location.hostname + ':8081';
+}