web-worker-helper
Version:
Utilities for running tasks on worker threads
178 lines (177 loc) • 7.68 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.getLibraryUrl = exports.loadLibrary = void 0;
/* global importScripts */
var globals_1 = require("../env-utils/globals");
var assert_1 = require("../env-utils/assert");
var loadLibraryPromises = {}; // promises
/**
* Dynamically loads a library ("module")
*
* - wasm library: Array buffer is returned
* - js library: Parse JS is returned
*
* Method depends on environment
* - browser - script element is created and installed on document
* - worker - eval is called on global context
* - node - file is required
*
* @param libraryUrl
* @param moduleName
* @param options
*/
function loadLibrary(libraryUrl_1) {
return __awaiter(this, arguments, void 0, function (libraryUrl, moduleName, options) {
if (moduleName === void 0) { moduleName = null; }
if (options === void 0) { options = {}; }
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (moduleName) {
libraryUrl = getLibraryUrl(libraryUrl, moduleName, options);
}
// Ensure libraries are only loaded once
loadLibraryPromises[libraryUrl] = loadLibraryPromises[libraryUrl] || loadLibraryFromFile(libraryUrl);
return [4 /*yield*/, loadLibraryPromises[libraryUrl]];
case 1: return [2 /*return*/, _a.sent()];
}
});
});
}
exports.loadLibrary = loadLibrary;
// TODO - sort out how to resolve paths for main/worker and dev/prod
function getLibraryUrl(library, moduleName, options) {
// Check if already a URL
if (library.startsWith('http')) {
return library;
}
// Allow application to import and supply libraries through `options.modules`
var modules = options.modules || {};
if (modules[library]) {
return modules[library];
}
// load from external scripts
if (options.CDN) {
(0, assert_1.assert)(options.CDN.startsWith('http'));
return "".concat(options.CDN, "/").concat(moduleName, "/dist/libs/").concat(library);
}
// TODO - loading inside workers requires paths relative to worker script location...
if (globals_1.isWorker) {
return "../src/libs/".concat(library);
}
return "modules/".concat(moduleName, "/src/libs/").concat(library);
}
exports.getLibraryUrl = getLibraryUrl;
function loadLibraryFromFile(libraryUrl) {
return __awaiter(this, void 0, void 0, function () {
var response_1, response, scriptSource;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!libraryUrl.endsWith('wasm')) return [3 /*break*/, 3];
return [4 /*yield*/, fetch(libraryUrl)];
case 1:
response_1 = _a.sent();
return [4 /*yield*/, response_1.arrayBuffer()];
case 2: return [2 /*return*/, _a.sent()];
case 3:
if (globals_1.isWorker) {
return [2 /*return*/, importScripts(libraryUrl)];
}
return [4 /*yield*/, fetch(libraryUrl)];
case 4:
response = _a.sent();
return [4 /*yield*/, response.text()];
case 5:
scriptSource = _a.sent();
return [2 /*return*/, loadLibraryFromString(scriptSource, libraryUrl)];
}
});
});
}
/*
async function loadScriptFromFile(libraryUrl) {
const script = document.createElement('script');
script.src = libraryUrl;
return await new Promise((resolve, reject) => {
script.onload = data => {
resolve(data);
};
script.onerror = reject;
});
}
*/
// TODO - Needs security audit...
// - Raw eval call
// - Potentially bypasses CORS
// Upside is that this separates fetching and parsing
// we could create a`LibraryLoader` or`ModuleLoader`
function loadLibraryFromString(scriptSource, id) {
if (globals_1.isWorker) {
// Use lvalue trick to make eval run in global scope
eval.call(globals_1.global, scriptSource); // eslint-disable-line no-eval
// https://stackoverflow.com/questions/9107240/1-evalthis-vs-evalthis-in-javascript
return null;
}
var script = document.createElement('script');
script.id = id;
// most browsers like a separate text node but some throw an error. The second method covers those.
try {
script.appendChild(document.createTextNode(scriptSource));
}
catch (e) {
script.text = scriptSource;
}
document.body.appendChild(script);
return null;
}
// TODO - technique for module injection into worker, from THREE.DracoLoader...
/*
function combineWorkerWithLibrary(worker, jsContent) {
var fn = wWorker.toString();
var body = [
'// injected',
jsContent,
'',
'// worker',
fn.substring(fn.indexOf('{') + 1, fn.lastIndexOf('}'))
].join('\n');
this.workerSourceURL = URL.createObjectURL(new Blob([body]));
}
*/