initial prototype

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

package.json

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+{
+  "name": "ts-canvas-app",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "build": "tsc && npm run build:client",
+    "build:client": "tsc -p src/client && webpack --config webpack.config.js && cp src/public/* dist/public",
+    "dev": "npm run build && node dist/server/main.js",
+    "clean": "rm -rf dist"
+  },
+  "dependencies": {
+    "@types/express": "^5.0.6",
+    "assert": "^2.1.0",
+    "browserify-zlib": "^0.2.0",
+    "buffer": "^6.0.3",
+    "crypto-browserify": "^3.12.1",
+    "depents": "^0.0.8",
+    "express": "^4.19.2",
+    "http": "^0.0.1-security",
+    "https-browserify": "^1.0.0",
+    "path-browserify": "^1.0.1",
+    "process": "^0.11.10",
+    "querystring-es3": "^0.2.1",
+    "rpclibrary": "^2.5.1",
+    "stream-browserify": "^3.0.0",
+    "stream-http": "^3.2.0",
+    "timers-browserify": "^2.0.12",
+    "url": "^0.11.4",
+    "util": "^0.12.5",
+    "vm-browserify": "^1.1.2"
+  },
+  "devDependencies": {
+    "rolldown": "latest",
+    "typescript": "latest",
+    "webpack": "^5.106.2",
+    "webpack-cli": "^7.0.2"
+  }
+}

src/client/main.ts

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+import { ClientStateService } from './services/state/state.client-service'
+import { ClientDrawService } from './services/draw/draw.client-service'
+
+const stateService = new ClientStateService()
+const drawService = new ClientDrawService(stateService)
+drawService.draw()
+stateService.connect()

src/client/model/canvas-state.ts

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+export type CanvasState = {
+    cursorP?: Cursor,
+    cursorK?: Cursor
+}
+
+export type Cursor = {
+    x: number, 
+    y: number,
+}

src/client/services/draw/draw.client-service.ts

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+import { Cursor } from "../../model/canvas-state";
+import { ClientStateService } from "../state/state.client-service";
+
+
+
+export class ClientDrawService {
+    private readonly canvasContext: CanvasRenderingContext2D
+
+    constructor(
+
+        private readonly stateService: ClientStateService,
+        private readonly canvas: HTMLCanvasElement = document.getElementById("canvas") as HTMLCanvasElement
+    ) {
+        this.resizeCanvas()
+        this.setupCanvasEvents()
+        window.addEventListener("resize", () => this.resizeCanvas());
+        this.canvasContext = canvas.getContext("2d")!
+    }
+
+    draw() {
+        const cursors: Cursor[] = this.stateService.getCursors()
+        
+        this.canvasContext.globalAlpha = 0.05;
+        this.canvasContext.fillStyle = "white";
+        this.canvasContext.fillRect(0, 0, this.canvas.width, this.canvas.height);
+        this.canvasContext.globalAlpha = 1;
+
+        cursors
+            .forEach(cursor => {
+                this.canvasContext.beginPath();
+                this.canvasContext.arc(cursor.x, cursor.y, 30, 0, Math.PI * 2);
+                this.canvasContext.fillStyle = "#eaafff";
+                this.canvasContext.fill();
+            })
+
+        requestAnimationFrame(() => this.draw())
+    }
+
+    private onMouseMove = (e: any) => {
+        const cursor = this.stateService.get('cursorK')
+        if (!cursor) {
+            return
+        }
+        const rect = this.canvas.getBoundingClientRect();
+        this.stateService.set('cursorK', {
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+        })
+    };
+
+    private onMouseDown = (e: any) => {
+        const rect = this.canvas.getBoundingClientRect();
+
+        this.stateService.set('cursorK', {
+            x: e.clientX - rect.left,
+            y: e.clientY - rect.top,
+        }).then(_ => {
+            this.canvas.addEventListener("mousemove", this.onMouseMove)
+        });
+
+    }
+
+    private setupCanvasEvents() {
+        this.canvas.addEventListener("mousedown", this.onMouseDown);
+
+        this.canvas.addEventListener("mouseup", () => {
+            this.canvas.removeEventListener('mousemove', this.onMouseMove)
+            this.stateService.set('cursorK', undefined)
+        });
+
+        this.canvas.removeEventListener("mouseleave", () => {
+            this.canvas.removeEventListener('mousemove', this.onMouseMove)
+            this.stateService.set('cursorK', undefined)
+        });
+    }
+
+    private resizeCanvas() {
+        const size = Math.min(window.innerWidth, window.innerHeight) * 0.9;
+        this.canvas.width = size;
+        this.canvas.height = size;
+    }
+}

src/client/services/state/state.client-service.ts

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+import { RPCSocket } from "../../../../node_modules/rpclibrary/js/Index";
+import { CanvasState } from "../../model/canvas-state";
+
+
+export class ClientStateService {
+
+    private remoteService: any
+    private canvasState: CanvasState = {}
+
+    getCursors() {
+        return [this.canvasState?.cursorK, this.canvasState?.cursorP].filter(cursor => cursor !== undefined)
+    }
+
+    async set<K extends keyof CanvasState>(k: K, v: CanvasState[K]) {
+        if(v === null || v === undefined){
+            delete this.canvasState[k]
+        }
+        await this.remoteService.set(k, v)
+    }
+
+    get<K extends keyof CanvasState>(k: K): CanvasState[K] {
+        return this.canvasState[k]
+    }
+
+    async connect() {
+        const sock = await new RPCSocket(8080, 'localhost').connect();
+        this.remoteService = sock['StateService']
+        this.canvasState = await this.remoteService.listen((state: CanvasState) => {
+            console.log(state)
+            this.canvasState = state
+            
+        })
+    }
+
+    
+}

src/client/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "ES6",
+    "outDir": "../../dist/client",
+    "rootDir": ".",
+    "strict": true,
+  },
+  "include": ["*.ts"],
+}

src/public/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>Canvas App</title>
+  <style>
+    body {
+      margin: 0;
+      background: #e0e0e0;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+      height: 100vh;
+    }
+    canvas {
+      background: #ffffff;
+      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
+    }
+  </style>
+</head>
+<body>
+  <canvas id="canvas"></canvas>
+  <script type="module" src="main.js"></script>
+</body>
+</html>

src/server/main.ts

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+import { Injector } from "depents";
+import { ExpressService } from "./services/express/express.service";
+
+Injector.resolve(ExpressService)

src/server/services/express/express.service.ts

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+import { Singleton, Initializable, Inject } from "depents";
+import http from "http";
+import express from "express";
+import path from "path";
+import { RPCServer } from "rpclibrary";
+import { StateService } from "../state/state.service";
+
+@Singleton({
+    initializationPriority: 1
+})
+export class ExpressService implements Initializable {
+
+    @Inject(StateService)
+    private stateService: StateService;
+
+    initialize() {
+        const app = express();
+        const PORT = 8080;
+
+        const publicDir = path.join(__dirname, "../../../public");
+        app.use(express.static(publicDir));
+
+        app.get("/", (_req, res) => {
+            res.sendFile(path.join(publicDir, "index.html"));
+        });
+
+        const httpServer = new http.Server(app)
+        const rpcServer = new RPCServer([
+            this.stateService,
+
+        ])
+        rpcServer.attach(httpServer)
+        rpcServer.listen(PORT)
+
+        console.log("Server up on", PORT)
+    };
+} 

src/server/services/state/state.service.ts

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+import { Singleton, Initializable } from "depents";
+import { RPCExporter } from "rpclibrary";
+import { CanvasState } from "../../../client/model/canvas-state";
+
+@Singleton()
+export class StateService implements Initializable, RPCExporter {
+    name = 'StateService' as const
+
+
+    private canvasState: CanvasState = {}
+    private clients: Array<(state: any) => void> = []
+
+    initialize() {
+        this.canvasState = {}
+        this.clients = []
+    };
+
+    set = async <K extends keyof CanvasState>(k: K, v: CanvasState[K]): Promise<void> => {
+        if (v === null || v === undefined) {
+            console.log("unset", k)
+            delete this.canvasState[k]
+        } else {
+            console.log("set", k, v)
+            this.canvasState[k] = v
+        }
+        this.clients.forEach((client) => {
+            client(this.canvasState)
+        })
+
+    }
+
+    listen = async (callback: (state: any) => Promise<void>) => {
+        console.log("New client", this.canvasState)
+        await callback(this.canvasState)
+        this.clients = [...this.clients, callback]
+        return this.canvasState
+    }
+
+    RPCs = [
+        this.set,
+        {
+            name: 'listen' as const,
+            hook: (cb: any) => { this.listen(cb) }
+        }
+    ]
+
+} 

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "CommonJS",
+    "rootDir": "src",
+    "outDir": "dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "noFallthroughCasesInSwitch": true,
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "strictPropertyInitialization": false,
+  },
+  "exclude": [
+    "scripts"
+  ]
+}

webpack.config.js

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+const path = require('path');
+const webpack = require('webpack');
+
+module.exports = {
+    mode: 'development', // or 'production'
+    entry: "./dist/client/main.js",
+    output: {
+        path: path.resolve(__dirname, "dist", "public"),
+        filename: "main.js"
+    },
+    resolve: {
+        fallback: {
+            // crypto + compression
+            crypto: require.resolve('crypto-browserify'),
+            zlib: require.resolve('browserify-zlib'),
+
+            // streams & utilities
+            stream: require.resolve('stream-browserify'),
+            buffer: require.resolve('buffer'),
+            util: require.resolve('util'),
+            assert: require.resolve('assert'),
+            process: require.resolve('process/browser'),
+
+            // networking
+            http: require.resolve('stream-http'),
+            https: require.resolve('https-browserify'),
+
+            // URL + PATH polyfills
+            url: require.resolve('url/'),
+            path: require.resolve('path-browserify'),
+
+            querystring: require.resolve('querystring-es3'),
+            vm: require.resolve("vm-browserify"), 
+            timers: require.resolve("timers-browserify"),
+            fs: false,
+        },
+    },
+    plugins: [
+        new webpack.ProvidePlugin({
+            process: 'process/browser',
+            Buffer: ['buffer', 'Buffer'],
+        }),
+    ],
+};