| 1 | | | import 'dart:js_interop'; |
| 2 | | | |
| 3 | | | import 'package:using/using.dart'; |
| 4 | | | import 'package:web/web.dart' as web; |
| 5 | | | |
| 6 | | | import '../../exceptions/squadron_error.dart'; |
| 7 | | | |
| 8 | | | class EntryPointUri with Releasable { |
| 9 | | 11 | EntryPointUri._(this.uri, {required bool revoke}) : _revoke = revoke; |
| 10 | | | |
| 11 | | | final String uri; |
| 12 | | | final bool _revoke; |
| 13 | | | |
| 14 | | | @override |
| 15 | | 1 | void release() { |
| 16 | | 11 | if (_revoke) { |
| 17 | | 11 | web.URL.revokeObjectURL(uri); |
| 18 | | | } |
| 19 | | 11 | super.release(); |
| 20 | | 1 | } |
| 21 | | | |
| 22 | | 11 | factory EntryPointUri.from(Uri workerEntrypoint) { |
| 23 | | | final fileName = |
| 24 | | 11 | workerEntrypoint.pathSegments.lastOrNull?.toString().toLowerCase() ?? |
| 25 | | 0 | ''; |
| 26 | | | |
| 27 | | 11 | if (fileName.endsWith('.js') || fileName.endsWith('.mjs')) { |
| 28 | | | // a JavaScript worker |
| 29 | | 11 | return EntryPointUri._(workerEntrypoint.toString(), revoke: false); |
| 30 | | 11 | } else if (fileName.endsWith('.wasm')) { |
| 31 | | | // blob containing the JavaScript code to load and invoke the Web Assembly worker |
| 32 | | | final blob = web.Blob( |
| 33 | | 11 | [wasmLoaderScript(workerEntrypoint.toString()).toJS].toJS, |
| 34 | | | web.BlobPropertyBag(type: 'application/javascript'), |
| 35 | | | ); |
| 36 | | 11 | return EntryPointUri._(web.URL.createObjectURL(blob), revoke: true); |
| 37 | | 1 | } else if (workerEntrypoint.isScheme('data') || |
| 38 | | 0 | workerEntrypoint.isScheme('javascript')) { |
| 39 | | | // something else, eg. inline JavaScript |
| 40 | | 1 | return EntryPointUri._(workerEntrypoint.toString(), revoke: false); |
| 41 | | | } else { |
| 42 | | 0 | throw SquadronErrorExt.create('Invalid entry point URI'); |
| 43 | | | } |
| 44 | | 11 | } |
| 45 | | | |
| 46 | | | static String wasmLoaderScript(String url) => '''(async function() { |
| 47 | | | const workerUri = new URL("${url.replaceAll('"', '\\"')}", self.location.origin).href; |
| 48 | | | try { |
| 49 | | | let dart2wasm_runtime; let moduleInstance; |
| 50 | | | const runtimeUri = workerUri.replaceAll('.unopt', '').replaceAll('.wasm', '.mjs'); |
| 51 | | | try { |
| 52 | | | const dartModule = WebAssembly.compileStreaming(fetch(workerUri)); |
| 53 | | | dart2wasm_runtime = await import(runtimeUri); |
| 54 | | | moduleInstance = await dart2wasm_runtime.instantiate(dartModule, {}); |
| 55 | | | } catch (exception) { |
| 56 | | | console.error(`Failed to fetch and instantiate wasm module \${workerUri}: \${exception}`); |
| 57 | | | console.error('See https://dart.dev/web/wasm for more information.'); |
| 58 | | | throw new Error(exception.message ?? 'Unknown error when instantiating worker module'); |
| 59 | | | } |
| 60 | | | try { |
| 61 | | | await dart2wasm_runtime.invoke(moduleInstance); |
| 62 | | | console.log(`Succesfully loaded and invoked \${workerUri}`); |
| 63 | | | } catch (exception) { |
| 64 | | | console.error(`Exception while invoking wasm module \${workerUri}: \${exception}`); |
| 65 | | | throw new Error(exception.message ?? 'Unknown error when invoking worker module'); |
| 66 | | | } |
| 67 | | | } catch (ex) { |
| 68 | | | const ts = (Date.now() - Date.UTC(2020, 1, 2)) * 1000; |
| 69 | | | postMessage([ts, null, ["\$sqdrn", `Failed to load Web Worker from \${workerUri}: \${ex}`, null], null, null]); |
| 70 | | | } |
| 71 | | | })()'''; |
| 72 | | | } |