@wfh/thread-promise-pool
Version:
2 Node.js utilities: a thread worker pool and a promise queue
146 lines • 15 kB
JavaScript
;
// tslint:disable no-console
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 });
var verbose = false;
function sendMsg(msg) {
return process.send(msg, null, {}, function (err) {
if (err)
console.error("[thread-pool] pid:" + process.pid + " failed to send Error message: ", msg, err);
});
}
process.on('uncaughtException', onUncaughtException);
// let doNotSendToParent = false;
function onUncaughtException(err) {
// log.error('Uncaught exception', err, err.stack);
console.error("[thread-pool] pid:" + process.pid + " Uncaught exception: ", err);
sendMsg({
type: 'error',
data: err.toString()
});
}
process.on('unhandledRejection', onUnhandledRejection);
function onUnhandledRejection(err) {
console.error("[thread-pool] pid:" + process.pid + " unhandledRejection", err);
sendMsg({
type: 'error',
data: err ? err.toString() : err
});
}
if (process.send) {
process.on('message', executeOnEvent);
}
function executeOnEvent(data) {
return __awaiter(this, void 0, void 0, function () {
var result, initData, exportFn, exportFn, ex_1;
var _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (data.exit) {
if (verbose)
console.log("[thread-pool] child process " + process.pid + " exit");
process.off('message', executeOnEvent);
// process.off('uncaughtException', onUncaughtException);
// process.off('unhandledRejection', onUnhandledRejection);
// setImmediate(() => process.exit(0));
return [2 /*return*/];
}
if (data.verbose != null) {
verbose = !!data.verbose;
}
_b.label = 1;
case 1:
_b.trys.push([1, 9, , 10]);
result = void 0;
initData = data;
if (!initData.initializer) return [3 /*break*/, 5];
if (verbose) {
console.log("[thread-pool] child process " + process.pid + " init");
}
exportFn = initData.initializer.exportFn;
if (!exportFn) return [3 /*break*/, 3];
return [4 /*yield*/, Promise.resolve(require(initData.initializer.file)[exportFn]())];
case 2:
_b.sent();
return [3 /*break*/, 4];
case 3:
require(initData.initializer.file);
_b.label = 4;
case 4: return [3 /*break*/, 8];
case 5:
if (verbose) {
console.log("[thread-pool] child process " + process.pid + " run");
}
exportFn = data.exportFn;
if (!exportFn) return [3 /*break*/, 7];
return [4 /*yield*/, Promise.resolve((_a = require(data.file))[exportFn].apply(_a, (data.args || [])))];
case 6:
result = _b.sent();
return [3 /*break*/, 8];
case 7:
require(data.file);
_b.label = 8;
case 8:
if (verbose) {
console.log("[thread-pool] child process " + process.pid + " wait");
}
sendMsg({ type: 'wait', data: result });
return [3 /*break*/, 10];
case 9:
ex_1 = _b.sent();
console.log("[thread-pool] child process " + process.pid + " error", ex_1);
try {
sendMsg({
type: 'error',
data: ex_1.toString()
});
}
catch (err) {
sendMsg({
type: 'error',
data: err.toString()
});
}
return [3 /*break*/, 10];
case 10: return [2 /*return*/];
}
});
});
}
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err.toString() : err\n  });\n}\n\nexport interface InitialOptions {\n  verbose?: boolean;\n  /** After worker being created, the exported function will be run,\n   * You can put any initial logic in it, like calling `require('source-map-support/register')` or\n   * setup process event handling for uncaughtException and unhandledRejection.\n   */\n  initializer?: {file: string; exportFn?: string};\n}\nexport interface Task {\n  file: string;\n  /**\n   * A function which can return Promise or non-Promise value\n   */\n  exportFn?: string;\n  args?: any[];\n}\n\nexport interface Command {\n  exit: boolean;\n}\n\nif (process.send) {\n  process.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] child process ${process.pid} exit`);\n    process.off('message', executeOnEvent);\n    // process.off('uncaughtException', onUncaughtException);\n    // process.off('unhandledRejection', onUnhandledRejection);\n    // setImmediate(() => process.exit(0));\n    return;\n  }\n\n  if ((data as InitialOptions).verbose != null) {\n    verbose = !!(data as InitialOptions).verbose;\n  }\n\n  try {\n    let result: any;\n    const initData = data as InitialOptions;\n    if (initData.initializer) {\n      if (verbose) {\n        console.log(`[thread-pool] child process ${process.pid} init`);\n      }\n      const exportFn = initData.initializer.exportFn;\n      if (exportFn) {\n        await Promise.resolve(require(initData.initializer.file)[exportFn]());\n      } else {\n        require(initData.initializer.file);\n      }\n    } else {\n      if (verbose) {\n        console.log(`[thread-pool] child process ${process.pid} run`);\n      }\n      const exportFn = (data as Task).exportFn;\n\n      if (exportFn) {\n        result =  await Promise.resolve(require((data as Task).file)[exportFn](\n          ...((data as Task).args || [])\n          ));\n      } else {\n        require((data as Task).file);\n      }\n    }\n\n    if (verbose) {\n      console.log(`[thread-pool] child process ${process.pid} wait`);\n    }\n    sendMsg({ type: 'wait', data: result });\n\n  } catch (ex) {\n    console.log(`[thread-pool] child process ${process.pid} error`, ex);\n    try {\n      sendMsg({\n        type: 'error',\n        data: ex.toString()\n      });\n    } catch (err) {\n      sendMsg({\n        type: 'error',\n        data: err.toString()\n      });\n    }\n  }\n}\n"]}