├── .gitignore ├── LICENSE ├── README.md ├── frontend ├── .gitignore ├── README.md ├── package-lock.json ├── package.json ├── public │ ├── favicon.png │ ├── global.css │ ├── images │ │ └── smiley.png │ └── index.html ├── rollup.config.js └── src │ ├── App.svelte │ ├── Chat.svelte │ ├── main.js │ ├── string-channel.js │ ├── string-channel.ts │ └── worker.js └── server ├── index.js ├── package-lock.json ├── package.json ├── string-channel.js └── string-channel.ts /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | lerna-debug.log* 8 | 9 | # Diagnostic reports (https://nodejs.org/api/report.html) 10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 11 | 12 | # Runtime data 13 | pids 14 | *.pid 15 | *.seed 16 | *.pid.lock 17 | 18 | # Directory for instrumented libs generated by jscoverage/JSCover 19 | lib-cov 20 | 21 | # Coverage directory used by tools like istanbul 22 | coverage 23 | *.lcov 24 | 25 | # nyc test coverage 26 | .nyc_output 27 | 28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 29 | .grunt 30 | 31 | # Bower dependency directory (https://bower.io/) 32 | bower_components 33 | 34 | # node-waf configuration 35 | .lock-wscript 36 | 37 | # Compiled binary addons (https://nodejs.org/api/addons.html) 38 | build/Release 39 | 40 | # Dependency directories 41 | node_modules/ 42 | jspm_packages/ 43 | 44 | # TypeScript v1 declaration files 45 | typings/ 46 | 47 | # TypeScript cache 48 | *.tsbuildinfo 49 | 50 | # Optional npm cache directory 51 | .npm 52 | 53 | # Optional eslint cache 54 | .eslintcache 55 | 56 | # Microbundle cache 57 | .rpt2_cache/ 58 | .rts2_cache_cjs/ 59 | .rts2_cache_es/ 60 | .rts2_cache_umd/ 61 | 62 | # Optional REPL history 63 | .node_repl_history 64 | 65 | # Output of 'npm pack' 66 | *.tgz 67 | 68 | # Yarn Integrity file 69 | .yarn-integrity 70 | 71 | # dotenv environment variables file 72 | .env 73 | .env.test 74 | 75 | # parcel-bundler cache (https://parceljs.org/) 76 | .cache 77 | 78 | # Next.js build output 79 | .next 80 | 81 | # Nuxt.js build / generate output 82 | .nuxt 83 | dist 84 | 85 | # Gatsby files 86 | .cache/ 87 | # Comment in the public line in if your project uses Gatsby and *not* Next.js 88 | # https://nextjs.org/blog/next-9-1#public-directory-support 89 | # public 90 | 91 | # vuepress build output 92 | .vuepress/dist 93 | 94 | # Serverless directories 95 | .serverless/ 96 | 97 | # FuseBox cache 98 | .fusebox/ 99 | 100 | # DynamoDB Local files 101 | .dynamodb/ 102 | 103 | # TernJS port file 104 | .tern-port 105 | -------------------------------------------------------------------------------- /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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Go here --> [sveltejs/component-template](https://github.com/sveltejs/component-template)* 2 | 3 | --- 4 | 5 | # svelte app 6 | 7 | This is a project template for [Svelte](https://svelte.dev) apps. It lives at https://github.com/sveltejs/template. 8 | 9 | To create a new project based on this template using [degit](https://github.com/Rich-Harris/degit): 10 | 11 | ```bash 12 | npx degit sveltejs/template svelte-app 13 | cd svelte-app 14 | ``` 15 | 16 | *Note that you will need to have [Node.js](https://nodejs.org) installed.* 17 | 18 | 19 | ## Get started 20 | 21 | Install the dependencies... 22 | 23 | ```bash 24 | cd svelte-app 25 | npm install 26 | ``` 27 | 28 | ...then start [Rollup](https://rollupjs.org): 29 | 30 | ```bash 31 | npm run dev 32 | ``` 33 | 34 | Navigate to [localhost:5000](http://localhost:5000). You should see your app running. Edit a component file in `src`, save it, and reload the page to see your changes. 35 | 36 | By default, the server will only respond to requests from localhost. To allow connections from other computers, edit the `sirv` commands in package.json to include the option `--host 0.0.0.0`. 37 | 38 | 39 | ## Building and running in production mode 40 | 41 | To create an optimised version of the app: 42 | 43 | ```bash 44 | npm run build 45 | ``` 46 | 47 | You can run the newly built app with `npm run start`. This uses [sirv](https://github.com/lukeed/sirv), which is included in your package.json's `dependencies` so that the app will work when you deploy to platforms like [Heroku](https://heroku.com). 48 | 49 | 50 | ## Single-page app mode 51 | 52 | By default, sirv will only respond to requests that match files in `public`. This is to maximise compatibility with static fileservers, allowing you to deploy your app anywhere. 53 | 54 | If you're building a single-page app (SPA) with multiple routes, sirv needs to be able to respond to requests for *any* path. You can make it so by editing the `"start"` command in package.json: 55 | 56 | ```js 57 | "start": "sirv public --single" 58 | ``` 59 | 60 | 61 | ## Deploying to the web 62 | 63 | ### With [now](https://zeit.co/now) 64 | 65 | Install `now` if you haven't already: 66 | 67 | ```bash 68 | npm install -g now 69 | ``` 70 | 71 | Then, from within your project folder: 72 | 73 | ```bash 74 | cd public 75 | now deploy --name my-project 76 | ``` 77 | 78 | As an alternative, use the [Now desktop client](https://zeit.co/download) and simply drag the unzipped project folder to the taskbar icon. 79 | 80 | ### With [surge](https://surge.sh/) 81 | 82 | Install `surge` if you haven't already: 83 | 84 | ```bash 85 | npm install -g surge 86 | ``` 87 | 88 | Then, from within your project folder: 89 | 90 | ```bash 91 | npm run build 92 | surge public my-project.surge.sh 93 | ``` 94 | -------------------------------------------------------------------------------- /frontend/package-lock.json: 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/frontend/package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "svelte-app", 3 | "version": "1.0.0", 4 | "scripts": { 5 | "build": "rollup -c", 6 | "dev": "rollup -c -w", 7 | "start": "sirv public" 8 | }, 9 | "devDependencies": { 10 | "@rollup/plugin-commonjs": "^11.0.0", 11 | "@rollup/plugin-node-resolve": "^7.0.0", 12 | "rollup": "^1.20.0", 13 | "rollup-plugin-livereload": "^1.0.0", 14 | "rollup-plugin-svelte": "^5.0.3", 15 | "rollup-plugin-terser": "^5.1.2", 16 | "svelte": "^3.0.0" 17 | }, 18 | "dependencies": { 19 | "comlink": "^4.2.0", 20 | "sirv-cli": "^0.4.4", 21 | "typescript": "^3.7.5" 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /frontend/public/favicon.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/noopkat/comlink-websocket-chat-experiment/9f3b414bd7486e54a69b0d0d7d361cff2d4dd453/frontend/public/favicon.png -------------------------------------------------------------------------------- /frontend/public/global.css: -------------------------------------------------------------------------------- 1 | html, body { 2 | position: relative; 3 | width: 100%; 4 | height: 100%; 5 | } 6 | 7 | body { 8 | color: #333; 9 | margin: 0; 10 | padding: 8px; 11 | box-sizing: border-box; 12 | font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; 13 | } 14 | 15 | a { 16 | color: rgb(0,100,200); 17 | text-decoration: none; 18 | } 19 | 20 | a:hover { 21 | text-decoration: underline; 22 | } 23 | 24 | a:visited { 25 | color: rgb(0,80,160); 26 | } 27 | 28 | label { 29 | display: block; 30 | } 31 | 32 | input, button, select, textarea { 33 | font-family: inherit; 34 | font-size: inherit; 35 | padding: 0.4em; 36 | margin: 0 0 0.5em 0; 37 | box-sizing: border-box; 38 | border: 1px solid #ccc; 39 | border-radius: 2px; 40 | } 41 | 42 | input:disabled { 43 | color: #ccc; 44 | } 45 | 46 | input[type="range"] { 47 | height: 0; 48 | } 49 | 50 | button { 51 | color: #333; 52 | background-color: #f4f4f4; 53 | outline: none; 54 | } 55 | 56 | button:disabled { 57 | color: #999; 58 | } 59 | 60 | button:not(:disabled):active { 61 | background-color: #ddd; 62 | } 63 | 64 | button:focus { 65 | border-color: #666; 66 | } 67 | -------------------------------------------------------------------------------- /frontend/public/images/smiley.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/noopkat/comlink-websocket-chat-experiment/9f3b414bd7486e54a69b0d0d7d361cff2d4dd453/frontend/public/images/smiley.png -------------------------------------------------------------------------------- /frontend/public/index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | Svelte app 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | -------------------------------------------------------------------------------- /frontend/rollup.config.js: -------------------------------------------------------------------------------- 1 | import svelte from "rollup-plugin-svelte"; 2 | 3 | import resolve from "@rollup/plugin-node-resolve"; 4 | import commonjs from "@rollup/plugin-commonjs"; 5 | import livereload from "rollup-plugin-livereload"; 6 | import { terser } from "rollup-plugin-terser"; 7 | 8 | const production = !process.env.ROLLUP_WATCH; 9 | 10 | export default [ 11 | { 12 | input: "src/main.js", 13 | output: { 14 | sourcemap: true, 15 | format: "iife", 16 | name: "app", 17 | file: "public/build/bundle.js" 18 | }, 19 | plugins: [ 20 | svelte({ 21 | // enable run-time checks when not in production 22 | dev: !production, 23 | // we'll extract any component CSS out into 24 | // a separate file - better for performance 25 | css: css => { 26 | css.write("public/build/bundle.css"); 27 | } 28 | }), 29 | 30 | // If you have external dependencies installed from 31 | // npm, you'll most likely need these plugins. In 32 | // some cases you'll need additional configuration - 33 | // consult the documentation for details: 34 | // https://github.com/rollup/plugins/tree/master/packages/commonjs 35 | resolve({ 36 | browser: true, 37 | dedupe: ["svelte"] 38 | }), 39 | commonjs(), 40 | 41 | // In dev mode, call `npm run start` once 42 | // the bundle has been generated 43 | !production && serve(), 44 | 45 | // Watch the `public` directory and refresh the 46 | // browser on changes when not in production 47 | // !production && livereload('public'), 48 | 49 | // If we're building for production (npm run build 50 | // instead of npm run dev), minify 51 | production && terser() 52 | ], 53 | watch: { 54 | clearScreen: false 55 | } 56 | }, 57 | { 58 | input: "src/worker.js", 59 | output: { 60 | sourcemap: true, 61 | format: "iife", 62 | name: "app", 63 | file: "public/build/worker.js" 64 | }, 65 | plugins: [ 66 | resolve() 67 | ] 68 | } 69 | ]; 70 | 71 | function serve() { 72 | let started = false; 73 | 74 | return { 75 | writeBundle() { 76 | if (!started) { 77 | started = true; 78 | 79 | require("child_process").spawn("npm", ["run", "start", "--", "--dev"], { 80 | stdio: ["ignore", "inherit", "inherit"], 81 | shell: true 82 | }); 83 | } 84 | } 85 | }; 86 | } 87 | -------------------------------------------------------------------------------- /frontend/src/App.svelte: -------------------------------------------------------------------------------- 1 | 6 | 7 |
8 |

Hello {name}!

9 | 10 |
11 | 12 | -------------------------------------------------------------------------------- /frontend/src/Chat.svelte: -------------------------------------------------------------------------------- 1 | 46 | 47 | 54 | 55 |
56 |
57 | {#each messageList as message} 58 |
59 | {@html message} 60 |
61 | 62 | {/each} 63 |
64 |
65 | 66 | 67 |
68 |
-------------------------------------------------------------------------------- /frontend/src/main.js: -------------------------------------------------------------------------------- 1 | import App from './App.svelte'; 2 | 3 | const app = new App({ 4 | target: document.body, 5 | props: { 6 | name: 'Suz' 7 | } 8 | }); 9 | 10 | export default app; -------------------------------------------------------------------------------- /frontend/src/string-channel.js: -------------------------------------------------------------------------------- 1 | /** 2 | * Copyright 2019 Google Inc. All Rights Reserved. 3 | * Licensed under the Apache License, Version 2.0 (the "License"); 4 | * you may not use this file except in compliance with the License. 5 | * You may obtain a copy of the License at 6 | * http://www.apache.org/licenses/LICENSE-2.0 7 | * Unless required by applicable law or agreed to in writing, software 8 | * distributed under the License is distributed on an "AS IS" BASIS, 9 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 10 | * See the License for the specific language governing permissions and 11 | * limitations under the License. 12 | */ 13 | function generateUID() { 14 | return new Array(4) 15 | .fill(0) 16 | .map(() => Math.floor(Math.random() * Number.MAX_SAFE_INTEGER).toString(16)) 17 | .join("-"); 18 | } 19 | function* iterateAllProperties(value, path = [], visited = new WeakSet()) { 20 | if (value === undefined) 21 | return; 22 | if (visited.has(value)) 23 | return; 24 | if (typeof value === "string") 25 | return; 26 | if (typeof value === "object") 27 | visited.add(value); 28 | yield { value, path }; 29 | // Emit these objects, but don’t traverse them. 30 | if (ArrayBuffer.isView(value)) 31 | return; 32 | if (value instanceof ArrayBuffer) 33 | return; 34 | const keys = Object.keys(value); 35 | for (const key of keys) { 36 | yield* iterateAllProperties(value[key], [...path, key], visited); 37 | } 38 | } 39 | function findAllTransferables(obj) { 40 | const transferables = []; 41 | for (const entry of iterateAllProperties(obj)) { 42 | if (isTransferable(entry.value)) { 43 | transferables.push(entry); 44 | } 45 | } 46 | return transferables; 47 | } 48 | function replaceValueAtPath(value, path, newValue) { 49 | const lastProp = path[path.length - 1]; 50 | for (const prop of path.slice(0, -1)) { 51 | value = value[prop]; 52 | } 53 | const oldValue = value[lastProp]; 54 | value[lastProp] = newValue; 55 | return oldValue; 56 | } 57 | function padLeft(str, pad, length) { 58 | return (pad.repeat(length) + str).slice(-length); 59 | } 60 | function hexEncode(buffer) { 61 | return [...new Uint8Array(buffer)] 62 | .map(v => padLeft(v.toString(16), "0", 2)) 63 | .join(""); 64 | } 65 | function hexDecode(s) { 66 | return new Uint8Array(s 67 | .split(/(..)/) 68 | .filter(Boolean) 69 | .map(v => parseInt(v, 16))).buffer; 70 | } 71 | function addMessageListener(target, listener) { 72 | if ("on" in target) { 73 | return target.on("message", (data) => listener({ data })); 74 | } 75 | target.addEventListener("message", listener); 76 | } 77 | function getTypedArrayType(v) { 78 | if (!ArrayBuffer.isView(v)) { 79 | return 0 /* Raw */; 80 | } 81 | if (v instanceof Int8Array) { 82 | return 1 /* Int8 */; 83 | } 84 | if (v instanceof Uint8Array) { 85 | return 2 /* Uint8 */; 86 | } 87 | if (v instanceof Uint8ClampedArray) { 88 | return 3 /* Uint8Clamped */; 89 | } 90 | if (v instanceof Int16Array) { 91 | return 4 /* Int16 */; 92 | } 93 | if (v instanceof Uint16Array) { 94 | return 5 /* Uint16 */; 95 | } 96 | if (v instanceof Int32Array) { 97 | return 6 /* Int32 */; 98 | } 99 | if (v instanceof Uint32Array) { 100 | return 7 /* Uint32 */; 101 | } 102 | if (v instanceof Float32Array) { 103 | return 8 /* Float32 */; 104 | } 105 | if (v instanceof Float64Array) { 106 | return 9 /* Float64 */; 107 | } 108 | if (v instanceof BigInt64Array) { 109 | return 10 /* BigInt64 */; 110 | } 111 | if (v instanceof BigUint64Array) { 112 | return 11 /* BigUint64 */; 113 | } 114 | throw Error("Unknown ArrayBufferView type"); 115 | } 116 | function getTypedViewConstructor(type) { 117 | switch (type) { 118 | case 0 /* Raw */: 119 | return v => v; 120 | case 1 /* Int8 */: 121 | return v => new Int8Array(v); 122 | case 2 /* Uint8 */: 123 | return v => new Uint8Array(v); 124 | case 3 /* Uint8Clamped */: 125 | return v => new Uint8ClampedArray(v); 126 | case 4 /* Int16 */: 127 | return v => new Int16Array(v); 128 | case 5 /* Uint16 */: 129 | return v => new Uint16Array(v); 130 | case 6 /* Int32 */: 131 | return v => new Int32Array(v); 132 | case 7 /* Uint32 */: 133 | return v => new Uint32Array(v); 134 | case 8 /* Float32 */: 135 | return v => new Float32Array(v); 136 | case 9 /* Float64 */: 137 | return v => new Float64Array(v); 138 | case 10 /* BigInt64 */: 139 | return v => new BigInt64Array(v); 140 | case 11 /* BigUint64 */: 141 | return v => new BigUint64Array(v); 142 | } 143 | } 144 | const messagePortMap = new Map(); 145 | function makeTransferable(v, ep) { 146 | if (v instanceof MessagePort) { 147 | const uid = generateUID(); 148 | messagePortMap.set(uid, ep); 149 | const wrapped = wrap(ep, uid); 150 | addMessageListener(v, ({ data }) => { 151 | wrapped.postMessage(data, findAllTransferables(data).map(v => v.value)); 152 | }); 153 | v.start(); 154 | addMessageListener(wrapped, ({ data }) => { 155 | v.postMessage(data, findAllTransferables(data).map(v => v.value)); 156 | }); 157 | return { 158 | type: 0 /* MessagePort */, 159 | path: [], 160 | value: uid 161 | }; 162 | } 163 | else if (v instanceof ArrayBuffer || ArrayBuffer.isView(v)) { 164 | const buffer = v.buffer || v; 165 | return { 166 | type: 1 /* TypedArray */, 167 | subtype: getTypedArrayType(v), 168 | path: [], 169 | value: hexEncode(buffer) 170 | }; 171 | } 172 | throw Error("Not transferable"); 173 | } 174 | function isTransferable(v) { 175 | if (v instanceof MessagePort) { 176 | return true; 177 | } 178 | if (v instanceof ArrayBuffer) { 179 | return true; 180 | } 181 | if (ArrayBuffer.isView(v)) { 182 | return true; 183 | } 184 | return false; 185 | } 186 | function deserializeTransferable(transfer, ep) { 187 | switch (transfer.type) { 188 | case 0 /* MessagePort */: 189 | const port = wrap(ep, transfer.value); 190 | return [port, port]; 191 | case 1 /* TypedArray */: 192 | const constructor = getTypedViewConstructor(transfer.subtype); 193 | const buffer = hexDecode(transfer.value); 194 | return [constructor(buffer), buffer]; 195 | default: 196 | throw Error("Unknown transferable"); 197 | } 198 | } 199 | export function wrap(ep, uid = "") { 200 | const { port1, port2 } = new MessageChannel(); 201 | ep.addMessageListener(msg => { 202 | let payload; 203 | payload = JSON.parse(msg); 204 | if (payload.uid !== uid) { 205 | return; 206 | } 207 | const transferables = payload.transfer 208 | .map(transfer => { 209 | const [replacement, transferable] = deserializeTransferable(transfer, ep); 210 | replaceValueAtPath(payload.data, transfer.path, replacement); 211 | return transferable; 212 | }) 213 | .filter(Boolean); 214 | port2.postMessage(payload.data, transferables); 215 | }); 216 | addMessageListener(port2, ({ data }) => { 217 | const transfer = []; 218 | for (const { path } of findAllTransferables(data)) { 219 | const oldValue = replaceValueAtPath(data, path, null); 220 | const serializedTransferable = makeTransferable(oldValue, ep); 221 | serializedTransferable.path = path; 222 | transfer.push(serializedTransferable); 223 | } 224 | ep.send(JSON.stringify({ uid, data, transfer })); 225 | }); 226 | port2.start(); 227 | return port1; 228 | } 229 | -------------------------------------------------------------------------------- /frontend/src/string-channel.ts: -------------------------------------------------------------------------------- 1 | /** 2 | * Copyright 2019 Google Inc. All Rights Reserved. 3 | * Licensed under the Apache License, Version 2.0 (the "License"); 4 | * you may not use this file except in compliance with the License. 5 | * You may obtain a copy of the License at 6 | * http://www.apache.org/licenses/LICENSE-2.0 7 | * Unless required by applicable law or agreed to in writing, software 8 | * distributed under the License is distributed on an "AS IS" BASIS, 9 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 10 | * See the License for the specific language governing permissions and 11 | * limitations under the License. 12 | */ 13 | 14 | export type StringListener = (msg: string) => void; 15 | export interface StringChannelEndpoint { 16 | addMessageListener(listener: StringListener): void; 17 | send(msg: string): void; 18 | } 19 | 20 | function generateUID(): string { 21 | return new Array(4) 22 | .fill(0) 23 | .map(() => Math.floor(Math.random() * Number.MAX_SAFE_INTEGER).toString(16)) 24 | .join("-"); 25 | } 26 | 27 | interface PropertyIteratorEntry { 28 | value: T; 29 | path: string[]; 30 | } 31 | 32 | function* iterateAllProperties( 33 | value: {} | undefined, 34 | path: string[] = [], 35 | visited: WeakSet<{}> = new WeakSet<{}>() 36 | ): Iterable { 37 | if (value === undefined) return; 38 | if (visited.has(value)) return; 39 | if (typeof value === "string") return; 40 | if (typeof value === "object") visited.add(value); 41 | yield { value, path }; 42 | 43 | // Emit these objects, but don’t traverse them. 44 | if (ArrayBuffer.isView(value)) return; 45 | if (value instanceof ArrayBuffer) return; 46 | 47 | const keys = Object.keys(value); 48 | for (const key of keys) { 49 | yield* iterateAllProperties((value as any)[key], [...path, key], visited); 50 | } 51 | } 52 | 53 | function findAllTransferables(obj: {}): PropertyIteratorEntry[] { 54 | const transferables: PropertyIteratorEntry[] = []; 55 | for (const entry of iterateAllProperties(obj)) { 56 | if (isTransferable(entry.value)) { 57 | transferables.push(entry as any); 58 | } 59 | } 60 | return transferables; 61 | } 62 | 63 | function replaceValueAtPath(value: any, path: string[], newValue: any): {} { 64 | const lastProp = path[path.length - 1]; 65 | for (const prop of path.slice(0, -1)) { 66 | value = value[prop]; 67 | } 68 | const oldValue = value[lastProp]; 69 | value[lastProp] = newValue; 70 | return oldValue; 71 | } 72 | 73 | function padLeft(str: string, pad: string, length: number): string { 74 | return (pad.repeat(length) + str).slice(-length); 75 | } 76 | 77 | function hexEncode(buffer: ArrayBuffer): string { 78 | return [...new Uint8Array(buffer)] 79 | .map(v => padLeft(v.toString(16), "0", 2)) 80 | .join(""); 81 | } 82 | 83 | function hexDecode(s: string): ArrayBuffer { 84 | return new Uint8Array( 85 | s 86 | .split(/(..)/) 87 | .filter(Boolean) 88 | .map(v => parseInt(v, 16)) 89 | ).buffer; 90 | } 91 | 92 | function addMessageListener( 93 | target: EventTarget, 94 | listener: (ev: MessageEvent) => void 95 | ) { 96 | if ("on" in target) { 97 | return (target as any).on("message", (data: any) => 98 | listener({ data } as any) 99 | ); 100 | } 101 | target.addEventListener("message", listener as any); 102 | } 103 | 104 | const enum SerializedTransferableType { 105 | MessagePort, 106 | TypedArray 107 | } 108 | 109 | const enum TypedArrayType { 110 | Raw, 111 | Int8, 112 | Uint8, 113 | Uint8Clamped, 114 | Int16, 115 | Uint16, 116 | Int32, 117 | Uint32, 118 | Float32, 119 | Float64, 120 | BigInt64, 121 | BigUint64 122 | } 123 | 124 | interface SerializedTransferableTypedArray { 125 | type: SerializedTransferableType.TypedArray; 126 | subtype: TypedArrayType; 127 | path: string[]; 128 | value: string; 129 | } 130 | 131 | function getTypedArrayType(v: ArrayBuffer | ArrayBufferView): TypedArrayType { 132 | if (!ArrayBuffer.isView(v)) { 133 | return TypedArrayType.Raw; 134 | } 135 | if (v instanceof Int8Array) { 136 | return TypedArrayType.Int8; 137 | } 138 | if (v instanceof Uint8Array) { 139 | return TypedArrayType.Uint8; 140 | } 141 | if (v instanceof Uint8ClampedArray) { 142 | return TypedArrayType.Uint8Clamped; 143 | } 144 | if (v instanceof Int16Array) { 145 | return TypedArrayType.Int16; 146 | } 147 | if (v instanceof Uint16Array) { 148 | return TypedArrayType.Uint16; 149 | } 150 | if (v instanceof Int32Array) { 151 | return TypedArrayType.Int32; 152 | } 153 | if (v instanceof Uint32Array) { 154 | return TypedArrayType.Uint32; 155 | } 156 | if (v instanceof Float32Array) { 157 | return TypedArrayType.Float32; 158 | } 159 | if (v instanceof Float64Array) { 160 | return TypedArrayType.Float64; 161 | } 162 | if (v instanceof BigInt64Array) { 163 | return TypedArrayType.BigInt64; 164 | } 165 | if (v instanceof BigUint64Array) { 166 | return TypedArrayType.BigUint64; 167 | } 168 | throw Error("Unknown ArrayBufferView type"); 169 | } 170 | 171 | function getTypedViewConstructor( 172 | type: TypedArrayType 173 | ): (v: ArrayBuffer) => ArrayBufferView | ArrayBuffer { 174 | switch (type) { 175 | case TypedArrayType.Raw: 176 | return v => v; 177 | case TypedArrayType.Int8: 178 | return v => new Int8Array(v); 179 | case TypedArrayType.Uint8: 180 | return v => new Uint8Array(v); 181 | case TypedArrayType.Uint8Clamped: 182 | return v => new Uint8ClampedArray(v); 183 | case TypedArrayType.Int16: 184 | return v => new Int16Array(v); 185 | case TypedArrayType.Uint16: 186 | return v => new Uint16Array(v); 187 | case TypedArrayType.Int32: 188 | return v => new Int32Array(v); 189 | case TypedArrayType.Uint32: 190 | return v => new Uint32Array(v); 191 | case TypedArrayType.Float32: 192 | return v => new Float32Array(v); 193 | case TypedArrayType.Float64: 194 | return v => new Float64Array(v); 195 | case TypedArrayType.BigInt64: 196 | return v => new BigInt64Array(v); 197 | case TypedArrayType.BigUint64: 198 | return v => new BigUint64Array(v); 199 | } 200 | } 201 | 202 | interface SerializedTransferableMessagePort { 203 | type: SerializedTransferableType.MessagePort; 204 | path: string[]; 205 | value: string; 206 | } 207 | 208 | type SerializedTransferable = 209 | | SerializedTransferableMessagePort 210 | | SerializedTransferableTypedArray; 211 | const messagePortMap = new Map(); 212 | function makeTransferable( 213 | v: unknown, 214 | ep: StringChannelEndpoint 215 | ): SerializedTransferable { 216 | if (v instanceof MessagePort) { 217 | const uid = generateUID(); 218 | messagePortMap.set(uid, ep); 219 | const wrapped = wrap(ep, uid); 220 | addMessageListener(v, ({ data }) => { 221 | wrapped.postMessage( 222 | data, 223 | findAllTransferables(data).map(v => v.value) 224 | ); 225 | }); 226 | v.start(); 227 | addMessageListener(wrapped, ({ data }) => { 228 | v.postMessage( 229 | data, 230 | findAllTransferables(data).map(v => v.value) 231 | ); 232 | }); 233 | 234 | return { 235 | type: SerializedTransferableType.MessagePort, 236 | path: [], 237 | value: uid 238 | }; 239 | } else if (v instanceof ArrayBuffer || ArrayBuffer.isView(v)) { 240 | const buffer = (v as any).buffer || v; 241 | return { 242 | type: SerializedTransferableType.TypedArray, 243 | subtype: getTypedArrayType(v), 244 | path: [], 245 | value: hexEncode(buffer) 246 | }; 247 | } 248 | throw Error("Not transferable"); 249 | } 250 | 251 | function isTransferable(v: any): v is Transferable { 252 | if (v instanceof MessagePort) { 253 | return true; 254 | } 255 | if (v instanceof ArrayBuffer) { 256 | return true; 257 | } 258 | if (ArrayBuffer.isView(v)) { 259 | return true; 260 | } 261 | return false; 262 | } 263 | 264 | function deserializeTransferable( 265 | transfer: SerializedTransferable, 266 | ep: StringChannelEndpoint 267 | ): [any, Transferable] { 268 | switch (transfer.type) { 269 | case SerializedTransferableType.MessagePort: 270 | const port = wrap(ep, transfer.value); 271 | return [port, port]; 272 | case SerializedTransferableType.TypedArray: 273 | const constructor = getTypedViewConstructor(transfer.subtype); 274 | const buffer = hexDecode(transfer.value); 275 | return [constructor(buffer), buffer]; 276 | default: 277 | throw Error("Unknown transferable"); 278 | } 279 | } 280 | 281 | interface StringChannelPayload { 282 | uid: string; 283 | data: any; 284 | transfer: SerializedTransferable[]; 285 | } 286 | 287 | export function wrap(ep: StringChannelEndpoint, uid = "") { 288 | const { port1, port2 } = new MessageChannel(); 289 | 290 | ep.addMessageListener(msg => { 291 | let payload: StringChannelPayload; 292 | payload = JSON.parse(msg); 293 | if (payload.uid !== uid) { 294 | return; 295 | } 296 | const transferables: Transferable[] = payload.transfer 297 | .map(transfer => { 298 | const [replacement, transferable] = deserializeTransferable( 299 | transfer, 300 | ep 301 | ); 302 | replaceValueAtPath(payload.data, transfer.path, replacement); 303 | return transferable; 304 | }) 305 | .filter(Boolean); 306 | port2.postMessage(payload.data, transferables); 307 | }); 308 | 309 | addMessageListener(port2, ({ data }) => { 310 | const transfer: SerializedTransferable[] = []; 311 | for (const { path } of findAllTransferables(data)) { 312 | const oldValue = replaceValueAtPath(data, path, null); 313 | const serializedTransferable = makeTransferable(oldValue, ep); 314 | serializedTransferable.path = path; 315 | transfer.push(serializedTransferable); 316 | } 317 | ep.send(JSON.stringify({ uid, data, transfer })); 318 | }); 319 | port2.start(); 320 | return port1; 321 | } -------------------------------------------------------------------------------- /frontend/src/worker.js: -------------------------------------------------------------------------------- 1 | import * as Comlink from "comlink"; 2 | 3 | const smileys = new Map([ 4 | [/:\)/g, "/images/smiley.png"] 5 | ]); 6 | 7 | const api = { 8 | sayHello(name) { 9 | console.log(`Hello ${name}!`); 10 | }, 11 | processMessage(message) { 12 | for(const [regexp, image] of smileys.entries()) { 13 | message = message.replace(regexp, ``); 14 | } 15 | return message; 16 | } 17 | } 18 | 19 | Comlink.expose(api); -------------------------------------------------------------------------------- /server/index.js: -------------------------------------------------------------------------------- 1 | const express = require("express"); 2 | const app = express(); 3 | const wsapp = require("express-ws")(app); 4 | const Comlink = require("comlink"); 5 | const nodeEndpoint = require("comlink/dist/umd/node-adapter.js"); 6 | const {wrap} = require("./string-channel.js"); 7 | 8 | const { MessageChannel, MessagePort } = require("worker_threads"); 9 | globalThis.MessageChannel = MessageChannel; 10 | globalThis.MessagePort = MessagePort; 11 | 12 | function websocketEndpoint(ws) { 13 | return nodeEndpoint( 14 | wrap({ 15 | addMessageListener(f) { 16 | ws.addEventListener("message", ev => f(ev.data)); 17 | }, 18 | send(msg) { 19 | ws.send(msg); 20 | } 21 | }) 22 | ); 23 | } 24 | 25 | const listeners = new Set(); 26 | 27 | class ChatClient { 28 | setName(name) { 29 | this._name = name; 30 | } 31 | sendMessage() { 32 | if(!this._name) { 33 | return; 34 | } 35 | } 36 | } 37 | 38 | app.ws("/ws2", (ws, req) => { 39 | Comlink.expose(new ChatClient(), websocketEndpoint(ws)); 40 | }); 41 | 42 | app.ws("/ws", (ws, req) => { 43 | listeners.add(ws); 44 | ws.on("message", data => { 45 | for (const listener of listeners) { 46 | if (listener === ws) { 47 | // Don’t send message to yourself. 48 | continue; 49 | } 50 | listener.send(data); 51 | } 52 | }); 53 | ws.on("close", () => { 54 | listeners.delete(ws); 55 | }); 56 | }); 57 | app.use("/", express.static("../frontend/public")); 58 | 59 | app.listen(8081); 60 | 61 | 62 | 63 | 64 | 65 | app.get("/test", (req, res) => { 66 | res.setHeader("Content-Type", "text/html"); 67 | res.send(` 68 | 69 | 70 | 71 | 

72 |     
84 |   `);
85 | });
86 | 


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204 |       "version": "2.0.3",
205 |       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
206 |       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
207 |     },
208 |     "ipaddr.js": {
209 |       "version": "1.9.0",
210 |       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.0.tgz",
211 |       "integrity": "sha512-M4Sjn6N/+O6/IXSJseKqHoFc+5FdGJ22sXqnjTpdZweHK64MzEPAyQZyEU3R/KRv2GLoa7nNtg/C2Ev6m7z+eA=="
212 |     },
213 |     "media-typer": {
214 |       "version": "0.3.0",
215 |       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
216 |       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
217 |     },
218 |     "merge-descriptors": {
219 |       "version": "1.0.1",
220 |       "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
221 |       "integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E="
222 |     },
223 |     "methods": {
224 |       "version": "1.1.2",
225 |       "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
226 |       "integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4="
227 |     },
228 |     "mime": {
229 |       "version": "1.6.0",
230 |       "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
231 |       "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg=="
232 |     },
233 |     "mime-db": {
234 |       "version": "1.43.0",
235 |       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.43.0.tgz",
236 |       "integrity": "sha512-+5dsGEEovYbT8UY9yD7eE4XTc4UwJ1jBYlgaQQF38ENsKR3wj/8q8RFZrF9WIZpB2V1ArTVFUva8sAul1NzRzQ=="
237 |     },
238 |     "mime-types": {
239 |       "version": "2.1.26",
240 |       "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.26.tgz",
241 |       "integrity": "sha512-01paPWYgLrkqAyrlDorC1uDwl2p3qZT7yl806vW7DvDoxwXi46jsjFbg+WdwotBIk6/MbEhO/dh5aZ5sNj/dWQ==",
242 |       "requires": {
243 |         "mime-db": "1.43.0"
244 |       }
245 |     },
246 |     "ms": {
247 |       "version": "2.0.0",
248 |       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
249 |       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
250 |     },
251 |     "negotiator": {
252 |       "version": "0.6.2",
253 |       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.2.tgz",
254 |       "integrity": "sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw=="
255 |     },
256 |     "on-finished": {
257 |       "version": "2.3.0",
258 |       "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
259 |       "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
260 |       "requires": {
261 |         "ee-first": "1.1.1"
262 |       }
263 |     },
264 |     "parseurl": {
265 |       "version": "1.3.3",
266 |       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
267 |       "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ=="
268 |     },
269 |     "path-to-regexp": {
270 |       "version": "0.1.7",
271 |       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
272 |       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
273 |     },
274 |     "prettier": {
275 |       "version": "1.19.1",
276 |       "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.19.1.tgz",
277 |       "integrity": "sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==",
278 |       "dev": true
279 |     },
280 |     "proxy-addr": {
281 |       "version": "2.0.5",
282 |       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.5.tgz",
283 |       "integrity": "sha512-t/7RxHXPH6cJtP0pRG6smSr9QJidhB+3kXu0KgXnbGYMgzEnUxRQ4/LDdfOwZEMyIh3/xHb8PX3t+lfL9z+YVQ==",
284 |       "requires": {
285 |         "forwarded": "~0.1.2",
286 |         "ipaddr.js": "1.9.0"
287 |       }
288 |     },
289 |     "qs": {
290 |       "version": "6.7.0",
291 |       "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
292 |       "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ=="
293 |     },
294 |     "range-parser": {
295 |       "version": "1.2.1",
296 |       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
297 |       "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg=="
298 |     },
299 |     "raw-body": {
300 |       "version": "2.4.0",
301 |       "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.4.0.tgz",
302 |       "integrity": "sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==",
303 |       "requires": {
304 |         "bytes": "3.1.0",
305 |         "http-errors": "1.7.2",
306 |         "iconv-lite": "0.4.24",
307 |         "unpipe": "1.0.0"
308 |       }
309 |     },
310 |     "safe-buffer": {
311 |       "version": "5.1.2",
312 |       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
313 |       "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
314 |     },
315 |     "safer-buffer": {
316 |       "version": "2.1.2",
317 |       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
318 |       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
319 |     },
320 |     "send": {
321 |       "version": "0.17.1",
322 |       "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
323 |       "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
324 |       "requires": {
325 |         "debug": "2.6.9",
326 |         "depd": "~1.1.2",
327 |         "destroy": "~1.0.4",
328 |         "encodeurl": "~1.0.2",
329 |         "escape-html": "~1.0.3",
330 |         "etag": "~1.8.1",
331 |         "fresh": "0.5.2",
332 |         "http-errors": "~1.7.2",
333 |         "mime": "1.6.0",
334 |         "ms": "2.1.1",
335 |         "on-finished": "~2.3.0",
336 |         "range-parser": "~1.2.1",
337 |         "statuses": "~1.5.0"
338 |       },
339 |       "dependencies": {
340 |         "ms": {
341 |           "version": "2.1.1",
342 |           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
343 |           "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
344 |         }
345 |       }
346 |     },
347 |     "serve-static": {
348 |       "version": "1.14.1",
349 |       "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
350 |       "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
351 |       "requires": {
352 |         "encodeurl": "~1.0.2",
353 |         "escape-html": "~1.0.3",
354 |         "parseurl": "~1.3.3",
355 |         "send": "0.17.1"
356 |       }
357 |     },
358 |     "setprototypeof": {
359 |       "version": "1.1.1",
360 |       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
361 |       "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw=="
362 |     },
363 |     "statuses": {
364 |       "version": "1.5.0",
365 |       "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
366 |       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
367 |     },
368 |     "toidentifier": {
369 |       "version": "1.0.0",
370 |       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
371 |       "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
372 |     },
373 |     "type-is": {
374 |       "version": "1.6.18",
375 |       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
376 |       "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
377 |       "requires": {
378 |         "media-typer": "0.3.0",
379 |         "mime-types": "~2.1.24"
380 |       }
381 |     },
382 |     "typescript": {
383 |       "version": "3.7.5",
384 |       "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.7.5.tgz",
385 |       "integrity": "sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw=="
386 |     },
387 |     "unpipe": {
388 |       "version": "1.0.0",
389 |       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
390 |       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
391 |     },
392 |     "utils-merge": {
393 |       "version": "1.0.1",
394 |       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
395 |       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
396 |     },
397 |     "vary": {
398 |       "version": "1.1.2",
399 |       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
400 |       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
401 |     },
402 |     "ws": {
403 |       "version": "5.2.2",
404 |       "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
405 |       "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
406 |       "requires": {
407 |         "async-limiter": "~1.0.0"
408 |       }
409 |     }
410 |   }
411 | }
412 | 


--------------------------------------------------------------------------------
/server/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "server",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "keywords": [],
10 |   "author": "",
11 |   "license": "MIT",
12 |   "dependencies": {
13 |     "comlink": "^4.2.0",
14 |     "express": "^4.17.1",
15 |     "express-ws": "^4.0.0",
16 |     "typescript": "^3.7.5"
17 |   },
18 |   "devDependencies": {
19 |     "prettier": "^1.19.1"
20 |   }
21 | }
22 | 


--------------------------------------------------------------------------------
/server/string-channel.js:
--------------------------------------------------------------------------------
  1 | "use strict";
  2 | /**
  3 |  * Copyright 2019 Google Inc. All Rights Reserved.
  4 |  * Licensed under the Apache License, Version 2.0 (the "License");
  5 |  * you may not use this file except in compliance with the License.
  6 |  * You may obtain a copy of the License at
  7 |  *     http://www.apache.org/licenses/LICENSE-2.0
  8 |  * Unless required by applicable law or agreed to in writing, software
  9 |  * distributed under the License is distributed on an "AS IS" BASIS,
 10 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 11 |  * See the License for the specific language governing permissions and
 12 |  * limitations under the License.
 13 |  */
 14 | Object.defineProperty(exports, "__esModule", { value: true });
 15 | function generateUID() {
 16 |     return new Array(4)
 17 |         .fill(0)
 18 |         .map(() => Math.floor(Math.random() * Number.MAX_SAFE_INTEGER).toString(16))
 19 |         .join("-");
 20 | }
 21 | function* iterateAllProperties(value, path = [], visited = new WeakSet()) {
 22 |     if (value === undefined)
 23 |         return;
 24 |     if (visited.has(value))
 25 |         return;
 26 |     if (typeof value === "string")
 27 |         return;
 28 |     if (typeof value === "object")
 29 |         visited.add(value);
 30 |     yield { value, path };
 31 |     // Emit these objects, but don’t traverse them.
 32 |     if (ArrayBuffer.isView(value))
 33 |         return;
 34 |     if (value instanceof ArrayBuffer)
 35 |         return;
 36 |     const keys = Object.keys(value);
 37 |     for (const key of keys) {
 38 |         yield* iterateAllProperties(value[key], [...path, key], visited);
 39 |     }
 40 | }
 41 | function findAllTransferables(obj) {
 42 |     const transferables = [];
 43 |     for (const entry of iterateAllProperties(obj)) {
 44 |         if (isTransferable(entry.value)) {
 45 |             transferables.push(entry);
 46 |         }
 47 |     }
 48 |     return transferables;
 49 | }
 50 | function replaceValueAtPath(value, path, newValue) {
 51 |     const lastProp = path[path.length - 1];
 52 |     for (const prop of path.slice(0, -1)) {
 53 |         value = value[prop];
 54 |     }
 55 |     const oldValue = value[lastProp];
 56 |     value[lastProp] = newValue;
 57 |     return oldValue;
 58 | }
 59 | function padLeft(str, pad, length) {
 60 |     return (pad.repeat(length) + str).slice(-length);
 61 | }
 62 | function hexEncode(buffer) {
 63 |     return [...new Uint8Array(buffer)]
 64 |         .map(v => padLeft(v.toString(16), "0", 2))
 65 |         .join("");
 66 | }
 67 | function hexDecode(s) {
 68 |     return new Uint8Array(s
 69 |         .split(/(..)/)
 70 |         .filter(Boolean)
 71 |         .map(v => parseInt(v, 16))).buffer;
 72 | }
 73 | function addMessageListener(target, listener) {
 74 |     if ("on" in target) {
 75 |         return target.on("message", (data) => listener({ data }));
 76 |     }
 77 |     target.addEventListener("message", listener);
 78 | }
 79 | function getTypedArrayType(v) {
 80 |     if (!ArrayBuffer.isView(v)) {
 81 |         return 0 /* Raw */;
 82 |     }
 83 |     if (v instanceof Int8Array) {
 84 |         return 1 /* Int8 */;
 85 |     }
 86 |     if (v instanceof Uint8Array) {
 87 |         return 2 /* Uint8 */;
 88 |     }
 89 |     if (v instanceof Uint8ClampedArray) {
 90 |         return 3 /* Uint8Clamped */;
 91 |     }
 92 |     if (v instanceof Int16Array) {
 93 |         return 4 /* Int16 */;
 94 |     }
 95 |     if (v instanceof Uint16Array) {
 96 |         return 5 /* Uint16 */;
 97 |     }
 98 |     if (v instanceof Int32Array) {
 99 |         return 6 /* Int32 */;
100 |     }
101 |     if (v instanceof Uint32Array) {
102 |         return 7 /* Uint32 */;
103 |     }
104 |     if (v instanceof Float32Array) {
105 |         return 8 /* Float32 */;
106 |     }
107 |     if (v instanceof Float64Array) {
108 |         return 9 /* Float64 */;
109 |     }
110 |     if (v instanceof BigInt64Array) {
111 |         return 10 /* BigInt64 */;
112 |     }
113 |     if (v instanceof BigUint64Array) {
114 |         return 11 /* BigUint64 */;
115 |     }
116 |     throw Error("Unknown ArrayBufferView type");
117 | }
118 | function getTypedViewConstructor(type) {
119 |     switch (type) {
120 |         case 0 /* Raw */:
121 |             return v => v;
122 |         case 1 /* Int8 */:
123 |             return v => new Int8Array(v);
124 |         case 2 /* Uint8 */:
125 |             return v => new Uint8Array(v);
126 |         case 3 /* Uint8Clamped */:
127 |             return v => new Uint8ClampedArray(v);
128 |         case 4 /* Int16 */:
129 |             return v => new Int16Array(v);
130 |         case 5 /* Uint16 */:
131 |             return v => new Uint16Array(v);
132 |         case 6 /* Int32 */:
133 |             return v => new Int32Array(v);
134 |         case 7 /* Uint32 */:
135 |             return v => new Uint32Array(v);
136 |         case 8 /* Float32 */:
137 |             return v => new Float32Array(v);
138 |         case 9 /* Float64 */:
139 |             return v => new Float64Array(v);
140 |         case 10 /* BigInt64 */:
141 |             return v => new BigInt64Array(v);
142 |         case 11 /* BigUint64 */:
143 |             return v => new BigUint64Array(v);
144 |     }
145 | }
146 | const messagePortMap = new Map();
147 | function makeTransferable(v, ep) {
148 |     if (v instanceof MessagePort) {
149 |         const uid = generateUID();
150 |         messagePortMap.set(uid, ep);
151 |         const wrapped = wrap(ep, uid);
152 |         addMessageListener(v, ({ data }) => {
153 |             wrapped.postMessage(data, findAllTransferables(data).map(v => v.value));
154 |         });
155 |         v.start();
156 |         addMessageListener(wrapped, ({ data }) => {
157 |             v.postMessage(data, findAllTransferables(data).map(v => v.value));
158 |         });
159 |         return {
160 |             type: 0 /* MessagePort */,
161 |             path: [],
162 |             value: uid
163 |         };
164 |     }
165 |     else if (v instanceof ArrayBuffer || ArrayBuffer.isView(v)) {
166 |         const buffer = v.buffer || v;
167 |         return {
168 |             type: 1 /* TypedArray */,
169 |             subtype: getTypedArrayType(v),
170 |             path: [],
171 |             value: hexEncode(buffer)
172 |         };
173 |     }
174 |     throw Error("Not transferable");
175 | }
176 | function isTransferable(v) {
177 |     if (v instanceof MessagePort) {
178 |         return true;
179 |     }
180 |     if (v instanceof ArrayBuffer) {
181 |         return true;
182 |     }
183 |     if (ArrayBuffer.isView(v)) {
184 |         return true;
185 |     }
186 |     return false;
187 | }
188 | function deserializeTransferable(transfer, ep) {
189 |     switch (transfer.type) {
190 |         case 0 /* MessagePort */:
191 |             const port = wrap(ep, transfer.value);
192 |             return [port, port];
193 |         case 1 /* TypedArray */:
194 |             const constructor = getTypedViewConstructor(transfer.subtype);
195 |             const buffer = hexDecode(transfer.value);
196 |             return [constructor(buffer), buffer];
197 |         default:
198 |             throw Error("Unknown transferable");
199 |     }
200 | }
201 | function wrap(ep, uid = "") {
202 |     const { port1, port2 } = new MessageChannel();
203 |     ep.addMessageListener(msg => {
204 |         let payload;
205 |         payload = JSON.parse(msg);
206 |         if (payload.uid !== uid) {
207 |             return;
208 |         }
209 |         const transferables = payload.transfer
210 |             .map(transfer => {
211 |             const [replacement, transferable] = deserializeTransferable(transfer, ep);
212 |             replaceValueAtPath(payload.data, transfer.path, replacement);
213 |             return transferable;
214 |         })
215 |             .filter(Boolean);
216 |         port2.postMessage(payload.data, transferables);
217 |     });
218 |     addMessageListener(port2, ({ data }) => {
219 |         const transfer = [];
220 |         for (const { path } of findAllTransferables(data)) {
221 |             const oldValue = replaceValueAtPath(data, path, null);
222 |             const serializedTransferable = makeTransferable(oldValue, ep);
223 |             serializedTransferable.path = path;
224 |             transfer.push(serializedTransferable);
225 |         }
226 |         ep.send(JSON.stringify({ uid, data, transfer }));
227 |     });
228 |     port2.start();
229 |     return port1;
230 | }
231 | exports.wrap = wrap;
232 | 


--------------------------------------------------------------------------------
/server/string-channel.ts:
--------------------------------------------------------------------------------
  1 | /**
  2 |  * Copyright 2019 Google Inc. All Rights Reserved.
  3 |  * Licensed under the Apache License, Version 2.0 (the "License");
  4 |  * you may not use this file except in compliance with the License.
  5 |  * You may obtain a copy of the License at
  6 |  *     http://www.apache.org/licenses/LICENSE-2.0
  7 |  * Unless required by applicable law or agreed to in writing, software
  8 |  * distributed under the License is distributed on an "AS IS" BASIS,
  9 |  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 10 |  * See the License for the specific language governing permissions and
 11 |  * limitations under the License.
 12 |  */
 13 | 
 14 | export type StringListener = (msg: string) => void;
 15 | export interface StringChannelEndpoint {
 16 |   addMessageListener(listener: StringListener): void;
 17 |   send(msg: string): void;
 18 | }
 19 | 
 20 | function generateUID(): string {
 21 |   return new Array(4)
 22 |     .fill(0)
 23 |     .map(() => Math.floor(Math.random() * Number.MAX_SAFE_INTEGER).toString(16))
 24 |     .join("-");
 25 | }
 26 | 
 27 | interface PropertyIteratorEntry {
 28 |   value: T;
 29 |   path: string[];
 30 | }
 31 | 
 32 | function* iterateAllProperties(
 33 |   value: {} | undefined,
 34 |   path: string[] = [],
 35 |   visited: WeakSet<{}> = new WeakSet<{}>()
 36 | ): Iterable {
 37 |   if (value === undefined) return;
 38 |   if (visited.has(value)) return;
 39 |   if (typeof value === "string") return;
 40 |   if (typeof value === "object") visited.add(value);
 41 |   yield { value, path };
 42 | 
 43 |   // Emit these objects, but don’t traverse them.
 44 |   if (ArrayBuffer.isView(value)) return;
 45 |   if (value instanceof ArrayBuffer) return;
 46 | 
 47 |   const keys = Object.keys(value);
 48 |   for (const key of keys) {
 49 |     yield* iterateAllProperties((value as any)[key], [...path, key], visited);
 50 |   }
 51 | }
 52 | 
 53 | function findAllTransferables(obj: {}): PropertyIteratorEntry[] {
 54 |   const transferables: PropertyIteratorEntry[] = [];
 55 |   for (const entry of iterateAllProperties(obj)) {
 56 |     if (isTransferable(entry.value)) {
 57 |       transferables.push(entry as any);
 58 |     }
 59 |   }
 60 |   return transferables;
 61 | }
 62 | 
 63 | function replaceValueAtPath(value: any, path: string[], newValue: any): {} {
 64 |   const lastProp = path[path.length - 1];
 65 |   for (const prop of path.slice(0, -1)) {
 66 |     value = value[prop];
 67 |   }
 68 |   const oldValue = value[lastProp];
 69 |   value[lastProp] = newValue;
 70 |   return oldValue;
 71 | }
 72 | 
 73 | function padLeft(str: string, pad: string, length: number): string {
 74 |   return (pad.repeat(length) + str).slice(-length);
 75 | }
 76 | 
 77 | function hexEncode(buffer: ArrayBuffer): string {
 78 |   return [...new Uint8Array(buffer)]
 79 |     .map(v => padLeft(v.toString(16), "0", 2))
 80 |     .join("");
 81 | }
 82 | 
 83 | function hexDecode(s: string): ArrayBuffer {
 84 |   return new Uint8Array(
 85 |     s
 86 |       .split(/(..)/)
 87 |       .filter(Boolean)
 88 |       .map(v => parseInt(v, 16))
 89 |   ).buffer;
 90 | }
 91 | 
 92 | function addMessageListener(
 93 |   target: EventTarget,
 94 |   listener: (ev: MessageEvent) => void
 95 | ) {
 96 |   if ("on" in target) {
 97 |     return (target as any).on("message", (data: any) =>
 98 |       listener({ data } as any)
 99 |     );
100 |   }
101 |   target.addEventListener("message", listener as any);
102 | }
103 | 
104 | const enum SerializedTransferableType {
105 |   MessagePort,
106 |   TypedArray
107 | }
108 | 
109 | const enum TypedArrayType {
110 |   Raw,
111 |   Int8,
112 |   Uint8,
113 |   Uint8Clamped,
114 |   Int16,
115 |   Uint16,
116 |   Int32,
117 |   Uint32,
118 |   Float32,
119 |   Float64,
120 |   BigInt64,
121 |   BigUint64
122 | }
123 | 
124 | interface SerializedTransferableTypedArray {
125 |   type: SerializedTransferableType.TypedArray;
126 |   subtype: TypedArrayType;
127 |   path: string[];
128 |   value: string;
129 | }
130 | 
131 | function getTypedArrayType(v: ArrayBuffer | ArrayBufferView): TypedArrayType {
132 |   if (!ArrayBuffer.isView(v)) {
133 |     return TypedArrayType.Raw;
134 |   }
135 |   if (v instanceof Int8Array) {
136 |     return TypedArrayType.Int8;
137 |   }
138 |   if (v instanceof Uint8Array) {
139 |     return TypedArrayType.Uint8;
140 |   }
141 |   if (v instanceof Uint8ClampedArray) {
142 |     return TypedArrayType.Uint8Clamped;
143 |   }
144 |   if (v instanceof Int16Array) {
145 |     return TypedArrayType.Int16;
146 |   }
147 |   if (v instanceof Uint16Array) {
148 |     return TypedArrayType.Uint16;
149 |   }
150 |   if (v instanceof Int32Array) {
151 |     return TypedArrayType.Int32;
152 |   }
153 |   if (v instanceof Uint32Array) {
154 |     return TypedArrayType.Uint32;
155 |   }
156 |   if (v instanceof Float32Array) {
157 |     return TypedArrayType.Float32;
158 |   }
159 |   if (v instanceof Float64Array) {
160 |     return TypedArrayType.Float64;
161 |   }
162 |   if (v instanceof BigInt64Array) {
163 |     return TypedArrayType.BigInt64;
164 |   }
165 |   if (v instanceof BigUint64Array) {
166 |     return TypedArrayType.BigUint64;
167 |   }
168 |   throw Error("Unknown ArrayBufferView type");
169 | }
170 | 
171 | function getTypedViewConstructor(
172 |   type: TypedArrayType
173 | ): (v: ArrayBuffer) => ArrayBufferView | ArrayBuffer {
174 |   switch (type) {
175 |     case TypedArrayType.Raw:
176 |       return v => v;
177 |     case TypedArrayType.Int8:
178 |       return v => new Int8Array(v);
179 |     case TypedArrayType.Uint8:
180 |       return v => new Uint8Array(v);
181 |     case TypedArrayType.Uint8Clamped:
182 |       return v => new Uint8ClampedArray(v);
183 |     case TypedArrayType.Int16:
184 |       return v => new Int16Array(v);
185 |     case TypedArrayType.Uint16:
186 |       return v => new Uint16Array(v);
187 |     case TypedArrayType.Int32:
188 |       return v => new Int32Array(v);
189 |     case TypedArrayType.Uint32:
190 |       return v => new Uint32Array(v);
191 |     case TypedArrayType.Float32:
192 |       return v => new Float32Array(v);
193 |     case TypedArrayType.Float64:
194 |       return v => new Float64Array(v);
195 |     case TypedArrayType.BigInt64:
196 |       return v => new BigInt64Array(v);
197 |     case TypedArrayType.BigUint64:
198 |       return v => new BigUint64Array(v);
199 |   }
200 | }
201 | 
202 | interface SerializedTransferableMessagePort {
203 |   type: SerializedTransferableType.MessagePort;
204 |   path: string[];
205 |   value: string;
206 | }
207 | 
208 | type SerializedTransferable =
209 |   | SerializedTransferableMessagePort
210 |   | SerializedTransferableTypedArray;
211 | const messagePortMap = new Map();
212 | function makeTransferable(
213 |   v: unknown,
214 |   ep: StringChannelEndpoint
215 | ): SerializedTransferable {
216 |   if (v instanceof MessagePort) {
217 |     const uid = generateUID();
218 |     messagePortMap.set(uid, ep);
219 |     const wrapped = wrap(ep, uid);
220 |     addMessageListener(v, ({ data }) => {
221 |       wrapped.postMessage(
222 |         data,
223 |         findAllTransferables(data).map(v => v.value)
224 |       );
225 |     });
226 |     v.start();
227 |     addMessageListener(wrapped, ({ data }) => {
228 |       v.postMessage(
229 |         data,
230 |         findAllTransferables(data).map(v => v.value)
231 |       );
232 |     });
233 | 
234 |     return {
235 |       type: SerializedTransferableType.MessagePort,
236 |       path: [],
237 |       value: uid
238 |     };
239 |   } else if (v instanceof ArrayBuffer || ArrayBuffer.isView(v)) {
240 |     const buffer = (v as any).buffer || v;
241 |     return {
242 |       type: SerializedTransferableType.TypedArray,
243 |       subtype: getTypedArrayType(v),
244 |       path: [],
245 |       value: hexEncode(buffer)
246 |     };
247 |   }
248 |   throw Error("Not transferable");
249 | }
250 | 
251 | function isTransferable(v: any): v is Transferable {
252 |   if (v instanceof MessagePort) {
253 |     return true;
254 |   }
255 |   if (v instanceof ArrayBuffer) {
256 |     return true;
257 |   }
258 |   if (ArrayBuffer.isView(v)) {
259 |     return true;
260 |   }
261 |   return false;
262 | }
263 | 
264 | function deserializeTransferable(
265 |   transfer: SerializedTransferable,
266 |   ep: StringChannelEndpoint
267 | ): [any, Transferable] {
268 |   switch (transfer.type) {
269 |     case SerializedTransferableType.MessagePort:
270 |       const port = wrap(ep, transfer.value);
271 |       return [port, port];
272 |     case SerializedTransferableType.TypedArray:
273 |       const constructor = getTypedViewConstructor(transfer.subtype);
274 |       const buffer = hexDecode(transfer.value);
275 |       return [constructor(buffer), buffer];
276 |     default:
277 |       throw Error("Unknown transferable");
278 |   }
279 | }
280 | 
281 | interface StringChannelPayload {
282 |   uid: string;
283 |   data: any;
284 |   transfer: SerializedTransferable[];
285 | }
286 | 
287 | export function wrap(ep: StringChannelEndpoint, uid = "") {
288 |   const { port1, port2 } = new MessageChannel();
289 | 
290 |   ep.addMessageListener(msg => {
291 |     let payload: StringChannelPayload;
292 |     payload = JSON.parse(msg);
293 |     if (payload.uid !== uid) {
294 |       return;
295 |     }
296 |     const transferables: Transferable[] = payload.transfer
297 |       .map(transfer => {
298 |         const [replacement, transferable] = deserializeTransferable(
299 |           transfer,
300 |           ep
301 |         );
302 |         replaceValueAtPath(payload.data, transfer.path, replacement);
303 |         return transferable;
304 |       })
305 |       .filter(Boolean);
306 |     port2.postMessage(payload.data, transferables);
307 |   });
308 | 
309 |   addMessageListener(port2, ({ data }) => {
310 |     const transfer: SerializedTransferable[] = [];
311 |     for (const { path } of findAllTransferables(data)) {
312 |       const oldValue = replaceValueAtPath(data, path, null);
313 |       const serializedTransferable = makeTransferable(oldValue, ep);
314 |       serializedTransferable.path = path;
315 |       transfer.push(serializedTransferable);
316 |     }
317 |     ep.send(JSON.stringify({ uid, data, transfer }));
318 |   });
319 |   port2.start();
320 |   return port1;
321 | }


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