web-worker-helper
Version:
Utilities for running tasks on worker threads
177 lines (176 loc) • 8.67 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 __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
import AsyncQueue from '../async-queue/async-queue';
import WorkerBody from '../worker-farm/worker-body';
/** Counter for jobs */
var requestId = 0;
// 异步队列
var inputBatches;
var options;
/**
* Set up a WebWorkerGlobalScope to talk with the main thread
*/
export function createWorker(process, processInBatches) {
var _this = this;
// 检查是否在 worker 线程中
if (typeof self === 'undefined') {
return;
}
var context = {
process: processOnMainThread,
};
WorkerBody.onmessage = function (type, payload) { return __awaiter(_this, void 0, void 0, function () {
var _a, result, resultIterator, _b, resultIterator_1, resultIterator_1_1, batch, e_1_1, error_1, message;
var _c, e_1, _d, _e;
return __generator(this, function (_f) {
switch (_f.label) {
case 0:
_f.trys.push([0, 19, , 20]);
_a = type;
switch (_a) {
case 'process': return [3 /*break*/, 1];
case 'process-in-batches': return [3 /*break*/, 3];
case 'input-batch': return [3 /*break*/, 16];
case 'input-done': return [3 /*break*/, 17];
}
return [3 /*break*/, 18];
case 1:
if (!process) {
throw new Error('Worker does not support atomic processing');
}
return [4 /*yield*/, process(payload.input, payload.options || {}, context)];
case 2:
result = _f.sent();
WorkerBody.postMessage('done', { result: result });
return [3 /*break*/, 18];
case 3:
if (!processInBatches) {
throw new Error('Worker does not support batched processing');
}
inputBatches = new AsyncQueue();
options = payload.options || {};
resultIterator = processInBatches(inputBatches, options, context);
_f.label = 4;
case 4:
_f.trys.push([4, 9, 10, 15]);
_b = true, resultIterator_1 = __asyncValues(resultIterator);
_f.label = 5;
case 5: return [4 /*yield*/, resultIterator_1.next()];
case 6:
if (!(resultIterator_1_1 = _f.sent(), _c = resultIterator_1_1.done, !_c)) return [3 /*break*/, 8];
_e = resultIterator_1_1.value;
_b = false;
batch = _e;
WorkerBody.postMessage('output-batch', { result: batch });
_f.label = 7;
case 7:
_b = true;
return [3 /*break*/, 5];
case 8: return [3 /*break*/, 15];
case 9:
e_1_1 = _f.sent();
e_1 = { error: e_1_1 };
return [3 /*break*/, 15];
case 10:
_f.trys.push([10, , 13, 14]);
if (!(!_b && !_c && (_d = resultIterator_1.return))) return [3 /*break*/, 12];
return [4 /*yield*/, _d.call(resultIterator_1)];
case 11:
_f.sent();
_f.label = 12;
case 12: return [3 /*break*/, 14];
case 13:
if (e_1) throw e_1.error;
return [7 /*endfinally*/];
case 14: return [7 /*endfinally*/];
case 15:
WorkerBody.postMessage('done', {});
return [3 /*break*/, 18];
case 16:
inputBatches.push(payload.input);
return [3 /*break*/, 18];
case 17:
inputBatches.close();
return [3 /*break*/, 18];
case 18: return [3 /*break*/, 20];
case 19:
error_1 = _f.sent();
message = error_1 instanceof Error ? error_1.message : '';
WorkerBody.postMessage('error', { error: message });
return [3 /*break*/, 20];
case 20: return [2 /*return*/];
}
});
}); };
}
function processOnMainThread(arrayBuffer, options) {
if (options === void 0) { options = {}; }
return new Promise(function (resolve, reject) {
var id = requestId++;
/**
*/
var onMessage = function (type, payload) {
if (payload.id !== id) {
// not ours
return;
}
switch (type) {
case 'done':
WorkerBody.removeEventListener(onMessage);
resolve(payload.result);
break;
case 'error':
WorkerBody.removeEventListener(onMessage);
reject(payload.error);
break;
default:
// ignore
}
};
WorkerBody.addEventListener(onMessage);
// Ask the main thread to decode data
var payload = { id: id, input: arrayBuffer, options: options };
WorkerBody.postMessage('process', payload);
});
}