web-worker-helper
Version:
Utilities for running tasks on worker threads
144 lines (143 loc) • 7.26 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 };
}
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.processOnWorker = exports.canProcessOnWorker = void 0;
var worker_farm_1 = __importDefault(require("../worker-farm/worker-farm"));
var remove_nontransferable_options_1 = require("../utils/worker-utils/remove-nontransferable-options");
var get_worker_url_1 = require("./get-worker-url");
/**
* Determines if we can parse with worker
* @param loader
* @param data
* @param options
*/
function canProcessOnWorker(worker, options) {
if (!worker_farm_1.default.isSupported()) {
return false;
}
return worker.worker && (options === null || options === void 0 ? void 0 : options.worker);
}
exports.canProcessOnWorker = canProcessOnWorker;
/**
* This function expects that the worker thread sends certain messages,
* Creating such a worker can be automated if the worker is wrapper by a call to createWorker
*/
function processOnWorker(worker_1, data_1) {
return __awaiter(this, arguments, void 0, function (worker, data, options, context) {
var name, url, workerFarm, workerPool, jobName, job, transferableOptions, result;
if (options === void 0) { options = {}; }
if (context === void 0) { context = {}; }
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
name = (0, get_worker_url_1.getWorkerName)(worker);
url = (0, get_worker_url_1.getWorkerURL)(worker, options);
workerFarm = worker_farm_1.default.getWorkerFarm(options);
workerPool = workerFarm.getWorkerPool({ name: name, url: url });
jobName = options.jobName || worker.name;
return [4 /*yield*/, workerPool.startJob(jobName, onMessage.bind(null, context))];
case 1:
job = _a.sent();
transferableOptions = (0, remove_nontransferable_options_1.removeNontransferableOptions)(options);
job.postMessage('process', { input: data, options: transferableOptions });
return [4 /*yield*/, job.result];
case 2:
result = _a.sent();
return [2 /*return*/, result.result];
}
});
});
}
exports.processOnWorker = processOnWorker;
/**
* Job completes when we receive the result
* @param job
* @param message
*/
function onMessage(context, job, type, payload) {
return __awaiter(this, void 0, void 0, function () {
var _a, id, input, options, result, error_1, message;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
_a = type;
switch (_a) {
case 'done': return [3 /*break*/, 1];
case 'error': return [3 /*break*/, 2];
case 'process': return [3 /*break*/, 3];
}
return [3 /*break*/, 8];
case 1:
// Worker is done
job.done(payload);
return [3 /*break*/, 9];
case 2:
// Worker encountered an error
job.error(new Error(payload.error));
return [3 /*break*/, 9];
case 3:
id = payload.id, input = payload.input, options = payload.options;
_b.label = 4;
case 4:
_b.trys.push([4, 6, , 7]);
if (!context.process) {
job.postMessage('error', { id: id, error: 'Worker not set up to process on main thread' });
return [2 /*return*/];
}
return [4 /*yield*/, context.process(input, options)];
case 5:
result = _b.sent();
job.postMessage('done', { id: id, result: result });
return [3 /*break*/, 7];
case 6:
error_1 = _b.sent();
message = error_1 instanceof Error ? error_1.message : 'unknown error';
job.postMessage('error', { id: id, error: message });
return [3 /*break*/, 7];
case 7: return [3 /*break*/, 9];
case 8:
console.warn("process-on-worker: unknown message ".concat(type));
_b.label = 9;
case 9: return [2 /*return*/];
}
});
});
}