@wfh/thread-promise-pool
Version:
2 Node.js utilities: a thread worker pool and a promise queue
118 lines • 14.8 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 (_) 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 });
// tslint:disable no-console
var worker_threads_1 = require("worker_threads");
var verbose = false;
var initialDone = Promise.resolve();
if (worker_threads_1.workerData) {
verbose = !!worker_threads_1.workerData.verbose;
if (worker_threads_1.workerData.initializer) {
var _a = worker_threads_1.workerData.initializer, file = _a.file, exportFn = _a.exportFn;
if (exportFn == null)
initialDone = Promise.resolve(require(file));
else
initialDone = Promise.resolve(require(file)[exportFn]());
}
else {
initialDone = Promise.resolve();
}
}
if (!worker_threads_1.isMainThread) {
worker_threads_1.parentPort.on('message', executeOnEvent);
}
function executeOnEvent(data) {
return __awaiter(this, void 0, void 0, function () {
var result, transferList, ex_1;
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (data.exit) {
if (verbose)
console.log("[thread-pool] worker " + (worker_threads_1.workerData === null || worker_threads_1.workerData === void 0 ? void 0 : worker_threads_1.workerData.id) + " exit");
worker_threads_1.parentPort.off('message', executeOnEvent);
// Don't call process.exit(0), there might be some unfinished output stream still on-going at this moment.
return [2 /*return*/];
}
return [4 /*yield*/, initialDone];
case 1:
_b.sent();
if (verbose) {
console.log("[thread-pool] worker " + (worker_threads_1.workerData === null || worker_threads_1.workerData === void 0 ? void 0 : worker_threads_1.workerData.id) + " run");
}
_b.label = 2;
case 2:
_b.trys.push([2, 4, , 5]);
return [4 /*yield*/, Promise.resolve((_a = require(data.file))[data.exportFn].apply(_a, (data.args || [])))];
case 3:
result = _b.sent();
if (verbose) {
console.log("[thread-pool] worker " + (worker_threads_1.workerData === null || worker_threads_1.workerData === void 0 ? void 0 : worker_threads_1.workerData.id) + " wait");
}
if (result != null && result.transferList) {
transferList = result.transferList;
delete result.transferList;
worker_threads_1.parentPort.postMessage({ type: 'wait', data: result }, transferList);
}
else {
worker_threads_1.parentPort.postMessage({ type: 'wait', data: result });
}
return [3 /*break*/, 5];
case 4:
ex_1 = _b.sent();
console.log("[thread-pool] worker " + (worker_threads_1.workerData === null || worker_threads_1.workerData === void 0 ? void 0 : worker_threads_1.workerData.id) + " error", ex_1);
try {
worker_threads_1.parentPort.postMessage({
type: 'error',
data: ex_1.toString()
});
}
catch (err) {
worker_threads_1.parentPort.postMessage({
type: 'error',
data: err.toString()
});
}
return [3 /*break*/, 5];
case 5: return [2 /*return*/];
}
});
});
}
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After transferring, \n   * they will not be usable on the sending side of the channel anymore (even if they are not contained in value).\n   * Unlike with child processes, transferring handles such as network sockets is currently not supported.\n   * If value contains SharedArrayBuffer instances, those will be accessible from either thread. \n   * They cannot be listed in transferList.\n   * value may still contain ArrayBuffer instances that are not in transferList;\n   * in that case, the underlying memory is copied rather than moved.\n   */\n  transferList?: WorkerOptions['transferList'];\n}\n\nexport interface TaskResult {\n  transferList?: WorkerOptions['transferList'];\n}\n\nexport interface Command {\n  exit: boolean;\n}\n\nif (workerData) {\n  verbose = !!(workerData as InitialOptions).verbose;\n  if ((workerData as InitialOptions).initializer) {\n    const {file, exportFn} = (workerData as InitialOptions).initializer!;\n    if (exportFn == null)\n      initialDone = Promise.resolve(require(file));\n    else\n      initialDone = Promise.resolve(require(file)[exportFn]());\n  } else {\n    initialDone = Promise.resolve();\n  }\n}\n\nif (!isMainThread) {\n  parentPort!.on('message', executeOnEvent);\n}\n\nasync function executeOnEvent(data: Task | Command) {\n  if ((data as Command).exit) {\n    if (verbose)\n      console.log(`[thread-pool] worker ${workerData?.id} exit`);\n    parentPort!.off('message', executeOnEvent);\n    // Don't call process.exit(0), there might be some unfinished output stream still on-going at this moment.\n    return;\n  }\n  await initialDone;\n  if (verbose) {\n    console.log(`[thread-pool] worker ${workerData?.id} run`);\n  }\n  try {\n    const result = await Promise.resolve(require((data as Task).file)[(data as Task).exportFn](\n      ...((data as Task).args || [])\n      ));\n\n    if (verbose) {\n      console.log(`[thread-pool] worker ${workerData?.id} wait`);\n    }\n    if (result != null && (result as TaskResult).transferList) {\n      const transferList = (result as TaskResult).transferList;\n      delete result.transferList;\n      parentPort!.postMessage({ type: 'wait', data: result }, transferList);\n    } else {\n      parentPort!.postMessage({ type: 'wait', data: result });\n    }\n\n  } catch (ex) {\n    console.log(`[thread-pool] worker ${workerData?.id} error`, ex);\n    try {\n      parentPort!.postMessage({\n        type: 'error',\n        data: ex.toString()\n      });\n    } catch (err) {\n      parentPort!.postMessage({\n        type: 'error',\n        data: err.toString()\n      });\n    }\n  }\n}\n"]}