mirror of
https://codeberg.org/keyoxide/doipjs.git
synced 2025-01-10 22:49:29 -07:00
1603 lines
No EOL
47 KiB
JavaScript
1603 lines
No EOL
47 KiB
JavaScript
/**
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* workerpool.js
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* https://github.com/josdejong/workerpool
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*
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* Offload tasks to a pool of workers on node.js and in the browser.
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*
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* @version 6.0.2
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* @date 2020-10-03
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*
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* @license
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* Copyright (C) 2014-2020 Jos de Jong <wjosdejong@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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(function webpackUniversalModuleDefinition(root, factory) {
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if(typeof exports === 'object' && typeof module === 'object')
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module.exports = factory();
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else if(typeof define === 'function' && define.amd)
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define("workerpool", [], factory);
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else if(typeof exports === 'object')
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exports["workerpool"] = factory();
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else
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root["workerpool"] = factory();
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})((typeof self !== 'undefined' ? self : this), function() {
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return /******/ (function(modules) { // webpackBootstrap
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/******/ // The module cache
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/******/ var installedModules = {};
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/******/
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/******/ // The require function
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/******/ function __webpack_require__(moduleId) {
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/******/
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/******/ // Check if module is in cache
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/******/ if(installedModules[moduleId]) {
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/******/ return installedModules[moduleId].exports;
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/******/ }
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/******/ // Create a new module (and put it into the cache)
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/******/ var module = installedModules[moduleId] = {
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/******/ i: moduleId,
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/******/ l: false,
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/******/ exports: {}
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/******/ };
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/******/
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/******/ // Execute the module function
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/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
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/******/
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/******/ // Flag the module as loaded
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/******/ module.l = true;
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/******/
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|
/******/ // Return the exports of the module
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/******/ return module.exports;
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/******/ }
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/******/
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|
/******/
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/******/ // expose the modules object (__webpack_modules__)
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/******/ __webpack_require__.m = modules;
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/******/
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/******/ // expose the module cache
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/******/ __webpack_require__.c = installedModules;
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/******/
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/******/ // define getter function for harmony exports
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/******/ __webpack_require__.d = function(exports, name, getter) {
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/******/ if(!__webpack_require__.o(exports, name)) {
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/******/ Object.defineProperty(exports, name, { enumerable: true, get: getter });
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/******/ }
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/******/ };
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/******/
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/******/ // define __esModule on exports
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/******/ __webpack_require__.r = function(exports) {
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/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
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/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
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/******/ }
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/******/ Object.defineProperty(exports, '__esModule', { value: true });
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/******/ };
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/******/
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|
/******/ // create a fake namespace object
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/******/ // mode & 1: value is a module id, require it
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/******/ // mode & 2: merge all properties of value into the ns
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/******/ // mode & 4: return value when already ns object
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/******/ // mode & 8|1: behave like require
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/******/ __webpack_require__.t = function(value, mode) {
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/******/ if(mode & 1) value = __webpack_require__(value);
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/******/ if(mode & 8) return value;
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/******/ if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;
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/******/ var ns = Object.create(null);
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/******/ __webpack_require__.r(ns);
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/******/ Object.defineProperty(ns, 'default', { enumerable: true, value: value });
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/******/ if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
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/******/ return ns;
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/******/ };
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/******/
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/******/ // getDefaultExport function for compatibility with non-harmony modules
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/******/ __webpack_require__.n = function(module) {
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/******/ var getter = module && module.__esModule ?
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/******/ function getDefault() { return module['default']; } :
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/******/ function getModuleExports() { return module; };
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/******/ __webpack_require__.d(getter, 'a', getter);
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/******/ return getter;
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/******/ };
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/******/
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/******/ // Object.prototype.hasOwnProperty.call
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/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
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/******/
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/******/ // __webpack_public_path__
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/******/ __webpack_require__.p = "";
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/******/
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/******/
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/******/ // Load entry module and return exports
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/******/ return __webpack_require__(__webpack_require__.s = 3);
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/******/ })
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/************************************************************************/
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/******/ ([
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/* 0 */
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/***/ (function(module, exports, __webpack_require__) {
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var requireFoolWebpack = __webpack_require__(2);
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// source: https://github.com/flexdinesh/browser-or-node
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var isNode = function (nodeProcess) {
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return (
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typeof nodeProcess !== 'undefined' &&
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nodeProcess.versions != null &&
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nodeProcess.versions.node != null
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);
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}
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module.exports.isNode = isNode
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// determines the JavaScript platform: browser or node
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module.exports.platform = typeof process !== 'undefined' && isNode(process)
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? 'node'
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: 'browser';
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// determines whether the code is running in main thread or not
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// note that in node.js we have to check both worker_thread and child_process
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var worker_threads = tryRequireFoolWebpack('worker_threads');
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module.exports.isMainThread = module.exports.platform === 'node'
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? ((!worker_threads || worker_threads.isMainThread) && !process.connected)
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: typeof Window !== 'undefined';
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// determines the number of cpus available
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module.exports.cpus = module.exports.platform === 'browser'
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? self.navigator.hardwareConcurrency
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: requireFoolWebpack('os').cpus().length;
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function tryRequireFoolWebpack (module) {
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try {
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return requireFoolWebpack(module);
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} catch(err) {
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return null
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}
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}
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/***/ }),
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/* 1 */
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/***/ (function(module, exports, __webpack_require__) {
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"use strict";
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/**
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* Promise
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*
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* Inspired by https://gist.github.com/RubaXa/8501359 from RubaXa <trash@rubaxa.org>
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*
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* @param {Function} handler Called as handler(resolve: Function, reject: Function)
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* @param {Promise} [parent] Parent promise for propagation of cancel and timeout
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*/
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function Promise(handler, parent) {
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var me = this;
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if (!(this instanceof Promise)) {
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throw new SyntaxError('Constructor must be called with the new operator');
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}
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if (typeof handler !== 'function') {
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throw new SyntaxError('Function parameter handler(resolve, reject) missing');
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}
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var _onSuccess = [];
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var _onFail = [];
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// status
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this.resolved = false;
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this.rejected = false;
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this.pending = true;
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/**
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* Process onSuccess and onFail callbacks: add them to the queue.
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* Once the promise is resolve, the function _promise is replace.
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* @param {Function} onSuccess
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* @param {Function} onFail
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* @private
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*/
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var _process = function (onSuccess, onFail) {
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_onSuccess.push(onSuccess);
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_onFail.push(onFail);
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};
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/**
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* Add an onSuccess callback and optionally an onFail callback to the Promise
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* @param {Function} onSuccess
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* @param {Function} [onFail]
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* @returns {Promise} promise
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*/
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this.then = function (onSuccess, onFail) {
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return new Promise(function (resolve, reject) {
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var s = onSuccess ? _then(onSuccess, resolve, reject) : resolve;
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var f = onFail ? _then(onFail, resolve, reject) : reject;
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_process(s, f);
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}, me);
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};
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/**
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* Resolve the promise
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* @param {*} result
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* @type {Function}
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*/
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var _resolve = function (result) {
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// update status
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me.resolved = true;
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me.rejected = false;
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me.pending = false;
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_onSuccess.forEach(function (fn) {
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fn(result);
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});
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_process = function (onSuccess, onFail) {
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onSuccess(result);
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};
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_resolve = _reject = function () { };
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return me;
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};
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/**
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* Reject the promise
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* @param {Error} error
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* @type {Function}
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*/
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var _reject = function (error) {
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// update status
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me.resolved = false;
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me.rejected = true;
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me.pending = false;
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_onFail.forEach(function (fn) {
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fn(error);
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});
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_process = function (onSuccess, onFail) {
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onFail(error);
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};
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_resolve = _reject = function () { }
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return me;
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};
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/**
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* Cancel te promise. This will reject the promise with a CancellationError
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* @returns {Promise} self
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*/
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this.cancel = function () {
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if (parent) {
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parent.cancel();
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}
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else {
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_reject(new CancellationError());
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}
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return me;
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};
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/**
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* Set a timeout for the promise. If the promise is not resolved within
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* the time, the promise will be cancelled and a TimeoutError is thrown.
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* If the promise is resolved in time, the timeout is removed.
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* @param {number} delay Delay in milliseconds
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* @returns {Promise} self
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*/
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this.timeout = function (delay) {
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if (parent) {
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parent.timeout(delay);
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}
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else {
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var timer = setTimeout(function () {
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_reject(new TimeoutError('Promise timed out after ' + delay + ' ms'));
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}, delay);
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me.always(function () {
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clearTimeout(timer);
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});
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}
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return me;
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};
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// attach handler passing the resolve and reject functions
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handler(function (result) {
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_resolve(result);
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}, function (error) {
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_reject(error);
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});
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}
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/**
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* Execute given callback, then call resolve/reject based on the returned result
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* @param {Function} callback
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* @param {Function} resolve
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* @param {Function} reject
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* @returns {Function}
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* @private
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*/
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function _then(callback, resolve, reject) {
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return function (result) {
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try {
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var res = callback(result);
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if (res && typeof res.then === 'function' && typeof res['catch'] === 'function') {
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// method returned a promise
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res.then(resolve, reject);
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}
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else {
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resolve(res);
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}
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}
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catch (error) {
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reject(error);
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}
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}
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}
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/**
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* Add an onFail callback to the Promise
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* @param {Function} onFail
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* @returns {Promise} promise
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*/
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Promise.prototype['catch'] = function (onFail) {
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return this.then(null, onFail);
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};
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// TODO: add support for Promise.catch(Error, callback)
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// TODO: add support for Promise.catch(Error, Error, callback)
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/**
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* Execute given callback when the promise either resolves or rejects.
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* @param {Function} fn
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* @returns {Promise} promise
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*/
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Promise.prototype.always = function (fn) {
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return this.then(fn, fn);
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};
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/**
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* Create a promise which resolves when all provided promises are resolved,
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* and fails when any of the promises resolves.
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* @param {Promise[]} promises
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* @returns {Promise} promise
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*/
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Promise.all = function (promises){
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return new Promise(function (resolve, reject) {
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var remaining = promises.length,
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results = [];
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if (remaining) {
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promises.forEach(function (p, i) {
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p.then(function (result) {
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results[i] = result;
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remaining--;
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if (remaining == 0) {
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resolve(results);
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}
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}, function (error) {
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remaining = 0;
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reject(error);
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});
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});
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}
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else {
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resolve(results);
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}
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});
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};
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/**
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* Create a promise resolver
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* @returns {{promise: Promise, resolve: Function, reject: Function}} resolver
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*/
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Promise.defer = function () {
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var resolver = {};
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resolver.promise = new Promise(function (resolve, reject) {
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resolver.resolve = resolve;
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resolver.reject = reject;
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});
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return resolver;
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};
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/**
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* Create a cancellation error
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* @param {String} [message]
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* @extends Error
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*/
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function CancellationError(message) {
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this.message = message || 'promise cancelled';
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this.stack = (new Error()).stack;
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}
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CancellationError.prototype = new Error();
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CancellationError.prototype.constructor = Error;
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CancellationError.prototype.name = 'CancellationError';
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Promise.CancellationError = CancellationError;
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/**
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* Create a timeout error
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* @param {String} [message]
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* @extends Error
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*/
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function TimeoutError(message) {
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this.message = message || 'timeout exceeded';
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this.stack = (new Error()).stack;
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}
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TimeoutError.prototype = new Error();
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TimeoutError.prototype.constructor = Error;
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TimeoutError.prototype.name = 'TimeoutError';
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Promise.TimeoutError = TimeoutError;
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module.exports = Promise;
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/***/ }),
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/* 2 */
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/***/ (function(module, exports) {
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// source of inspiration: https://github.com/sindresorhus/require-fool-webpack
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|
var requireFoolWebpack = eval(
|
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'typeof require !== \'undefined\' ' +
|
|
'? require ' +
|
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': function (module) { throw new Error(\'Module " + module + " not found.\') }'
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);
|
|
|
|
module.exports = requireFoolWebpack;
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|
|
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/***/ }),
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/* 3 */
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/***/ (function(module, exports, __webpack_require__) {
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var environment = __webpack_require__(0);
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/**
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* Create a new worker pool
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* @param {string} [script]
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* @param {WorkerPoolOptions} [options]
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* @returns {Pool} pool
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*/
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exports.pool = function pool(script, options) {
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var Pool = __webpack_require__(4);
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return new Pool(script, options);
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};
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/**
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* Create a worker and optionally register a set of methods to the worker.
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* @param {Object} [methods]
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*/
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exports.worker = function worker(methods) {
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var worker = __webpack_require__(8);
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worker.add(methods);
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};
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|
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/**
|
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* Create a promise.
|
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* @type {Promise} promise
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|
*/
|
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exports.Promise = __webpack_require__(1);
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exports.platform = environment.platform;
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exports.isMainThread = environment.isMainThread;
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exports.cpus = environment.cpus;
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/***/ }),
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/* 4 */
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/***/ (function(module, exports, __webpack_require__) {
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var Promise = __webpack_require__(1);
|
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var WorkerHandler = __webpack_require__(5);
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var environment = __webpack_require__(0);
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var DebugPortAllocator = __webpack_require__(7);
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var DEBUG_PORT_ALLOCATOR = new DebugPortAllocator();
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|
/**
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* A pool to manage workers
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* @param {String} [script] Optional worker script
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* @param {WorkerPoolOptions} [options] See docs
|
|
* @constructor
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*/
|
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function Pool(script, options) {
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if (typeof script === 'string') {
|
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this.script = script || null;
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}
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else {
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this.script = null;
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options = script;
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}
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this.workers = []; // queue with all workers
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this.tasks = []; // queue with tasks awaiting execution
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options = options || {};
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this.forkArgs = options.forkArgs || [];
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this.forkOpts = options.forkOpts || {};
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this.debugPortStart = (options.debugPortStart || 43210);
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this.nodeWorker = options.nodeWorker;
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this.workerType = options.workerType || options.nodeWorker || 'auto'
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this.maxQueueSize = options.maxQueueSize || Infinity;
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|
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// configuration
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if (options && 'maxWorkers' in options) {
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validateMaxWorkers(options.maxWorkers);
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this.maxWorkers = options.maxWorkers;
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}
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else {
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this.maxWorkers = Math.max((environment.cpus || 4) - 1, 1);
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}
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|
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if (options && 'minWorkers' in options) {
|
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if(options.minWorkers === 'max') {
|
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this.minWorkers = this.maxWorkers;
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} else {
|
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validateMinWorkers(options.minWorkers);
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this.minWorkers = options.minWorkers;
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this.maxWorkers = Math.max(this.minWorkers, this.maxWorkers); // in case minWorkers is higher than maxWorkers
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}
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this._ensureMinWorkers();
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}
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|
this._boundNext = this._next.bind(this);
|
|
|
|
|
|
if (this.workerType === 'thread') {
|
|
WorkerHandler.ensureWorkerThreads();
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Execute a function on a worker.
|
|
*
|
|
* Example usage:
|
|
*
|
|
* var pool = new Pool()
|
|
*
|
|
* // call a function available on the worker
|
|
* pool.exec('fibonacci', [6])
|
|
*
|
|
* // offload a function
|
|
* function add(a, b) {
|
|
* return a + b
|
|
* };
|
|
* pool.exec(add, [2, 4])
|
|
* .then(function (result) {
|
|
* console.log(result); // outputs 6
|
|
* })
|
|
* .catch(function(error) {
|
|
* console.log(error);
|
|
* });
|
|
*
|
|
* @param {String | Function} method Function name or function.
|
|
* If `method` is a string, the corresponding
|
|
* method on the worker will be executed
|
|
* If `method` is a Function, the function
|
|
* will be stringified and executed via the
|
|
* workers built-in function `run(fn, args)`.
|
|
* @param {Array} [params] Function arguments applied when calling the function
|
|
* @return {Promise.<*, Error>} result
|
|
*/
|
|
Pool.prototype.exec = function (method, params) {
|
|
// validate type of arguments
|
|
if (params && !Array.isArray(params)) {
|
|
throw new TypeError('Array expected as argument "params"');
|
|
}
|
|
|
|
if (typeof method === 'string') {
|
|
var resolver = Promise.defer();
|
|
|
|
if (this.tasks.length >= this.maxQueueSize) {
|
|
throw new Error('Max queue size of ' + this.maxQueueSize + ' reached');
|
|
}
|
|
|
|
// add a new task to the queue
|
|
var tasks = this.tasks;
|
|
var task = {
|
|
method: method,
|
|
params: params,
|
|
resolver: resolver,
|
|
timeout: null
|
|
};
|
|
tasks.push(task);
|
|
|
|
// replace the timeout method of the Promise with our own,
|
|
// which starts the timer as soon as the task is actually started
|
|
var originalTimeout = resolver.promise.timeout;
|
|
resolver.promise.timeout = function timeout (delay) {
|
|
if (tasks.indexOf(task) !== -1) {
|
|
// task is still queued -> start the timer later on
|
|
task.timeout = delay;
|
|
return resolver.promise;
|
|
}
|
|
else {
|
|
// task is already being executed -> start timer immediately
|
|
return originalTimeout.call(resolver.promise, delay);
|
|
}
|
|
};
|
|
|
|
// trigger task execution
|
|
this._next();
|
|
|
|
return resolver.promise;
|
|
}
|
|
else if (typeof method === 'function') {
|
|
// send stringified function and function arguments to worker
|
|
return this.exec('run', [String(method), params]);
|
|
}
|
|
else {
|
|
throw new TypeError('Function or string expected as argument "method"');
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Create a proxy for current worker. Returns an object containing all
|
|
* methods available on the worker. The methods always return a promise.
|
|
*
|
|
* @return {Promise.<Object, Error>} proxy
|
|
*/
|
|
Pool.prototype.proxy = function () {
|
|
if (arguments.length > 0) {
|
|
throw new Error('No arguments expected');
|
|
}
|
|
|
|
var pool = this;
|
|
return this.exec('methods')
|
|
.then(function (methods) {
|
|
var proxy = {};
|
|
|
|
methods.forEach(function (method) {
|
|
proxy[method] = function () {
|
|
return pool.exec(method, Array.prototype.slice.call(arguments));
|
|
}
|
|
});
|
|
|
|
return proxy;
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Creates new array with the results of calling a provided callback function
|
|
* on every element in this array.
|
|
* @param {Array} array
|
|
* @param {function} callback Function taking two arguments:
|
|
* `callback(currentValue, index)`
|
|
* @return {Promise.<Array>} Returns a promise which resolves with an Array
|
|
* containing the results of the callback function
|
|
* executed for each of the array elements.
|
|
*/
|
|
/* TODO: implement map
|
|
Pool.prototype.map = function (array, callback) {
|
|
};
|
|
*/
|
|
|
|
/**
|
|
* Grab the first task from the queue, find a free worker, and assign the
|
|
* worker to the task.
|
|
* @protected
|
|
*/
|
|
Pool.prototype._next = function () {
|
|
if (this.tasks.length > 0) {
|
|
// there are tasks in the queue
|
|
|
|
// find an available worker
|
|
var worker = this._getWorker();
|
|
if (worker) {
|
|
// get the first task from the queue
|
|
var me = this;
|
|
var task = this.tasks.shift();
|
|
|
|
// check if the task is still pending (and not cancelled -> promise rejected)
|
|
if (task.resolver.promise.pending) {
|
|
// send the request to the worker
|
|
var promise = worker.exec(task.method, task.params, task.resolver)
|
|
.then(me._boundNext)
|
|
.catch(function () {
|
|
// if the worker crashed and terminated, remove it from the pool
|
|
if (worker.terminated) {
|
|
return me._removeWorker(worker);
|
|
}
|
|
}).then(function() {
|
|
me._next(); // trigger next task in the queue
|
|
});
|
|
|
|
// start queued timer now
|
|
if (typeof task.timeout === 'number') {
|
|
promise.timeout(task.timeout);
|
|
}
|
|
} else {
|
|
// The task taken was already complete (either rejected or resolved), so just trigger next task in the queue
|
|
me._next();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Get an available worker. If no worker is available and the maximum number
|
|
* of workers isn't yet reached, a new worker will be created and returned.
|
|
* If no worker is available and the maximum number of workers is reached,
|
|
* null will be returned.
|
|
*
|
|
* @return {WorkerHandler | null} worker
|
|
* @private
|
|
*/
|
|
Pool.prototype._getWorker = function() {
|
|
// find a non-busy worker
|
|
var workers = this.workers;
|
|
for (var i = 0; i < workers.length; i++) {
|
|
var worker = workers[i];
|
|
if (worker.busy() === false) {
|
|
return worker;
|
|
}
|
|
}
|
|
|
|
if (workers.length < this.maxWorkers) {
|
|
// create a new worker
|
|
worker = this._createWorkerHandler();
|
|
workers.push(worker);
|
|
return worker;
|
|
}
|
|
|
|
return null;
|
|
};
|
|
|
|
/**
|
|
* Remove a worker from the pool.
|
|
* Attempts to terminate worker if not already terminated, and ensures the minimum
|
|
* pool size is met.
|
|
* @param {WorkerHandler} worker
|
|
* @return {Promise<WorkerHandler>}
|
|
* @protected
|
|
*/
|
|
Pool.prototype._removeWorker = function(worker) {
|
|
DEBUG_PORT_ALLOCATOR.releasePort(worker.debugPort);
|
|
// _removeWorker will call this, but we need it to be removed synchronously
|
|
this._removeWorkerFromList(worker);
|
|
// If minWorkers set, spin up new workers to replace the crashed ones
|
|
this._ensureMinWorkers();
|
|
// terminate the worker (if not already terminated)
|
|
return new Promise(function(resolve, reject) {
|
|
worker.terminate(false, function(err) {
|
|
if (err) {
|
|
reject(err);
|
|
} else {
|
|
resolve(worker);
|
|
}
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Remove a worker from the pool list.
|
|
* @param {WorkerHandler} worker
|
|
* @protected
|
|
*/
|
|
Pool.prototype._removeWorkerFromList = function(worker) {
|
|
// remove from the list with workers
|
|
var index = this.workers.indexOf(worker);
|
|
if (index !== -1) {
|
|
this.workers.splice(index, 1);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Close all active workers. Tasks currently being executed will be finished first.
|
|
* @param {boolean} [force=false] If false (default), the workers are terminated
|
|
* after finishing all tasks currently in
|
|
* progress. If true, the workers will be
|
|
* terminated immediately.
|
|
* @param {number} [timeout] If provided and non-zero, worker termination promise will be rejected
|
|
* after timeout if worker process has not been terminated.
|
|
* @return {Promise.<void, Error>}
|
|
*/
|
|
Pool.prototype.terminate = function (force, timeout) {
|
|
// cancel any pending tasks
|
|
this.tasks.forEach(function (task) {
|
|
task.resolver.reject(new Error('Pool terminated'));
|
|
});
|
|
this.tasks.length = 0;
|
|
|
|
var f = function (worker) {
|
|
this._removeWorkerFromList(worker);
|
|
};
|
|
var removeWorker = f.bind(this);
|
|
|
|
var promises = [];
|
|
var workers = this.workers.slice();
|
|
workers.forEach(function (worker) {
|
|
var termPromise = worker.terminateAndNotify(force, timeout)
|
|
.then(removeWorker);
|
|
promises.push(termPromise);
|
|
});
|
|
return Promise.all(promises);
|
|
};
|
|
|
|
/**
|
|
* Retrieve statistics on tasks and workers.
|
|
* @return {{totalWorkers: number, busyWorkers: number, idleWorkers: number, pendingTasks: number, activeTasks: number}} Returns an object with statistics
|
|
*/
|
|
Pool.prototype.stats = function () {
|
|
var totalWorkers = this.workers.length;
|
|
var busyWorkers = this.workers.filter(function (worker) {
|
|
return worker.busy();
|
|
}).length;
|
|
|
|
return {
|
|
totalWorkers: totalWorkers,
|
|
busyWorkers: busyWorkers,
|
|
idleWorkers: totalWorkers - busyWorkers,
|
|
|
|
pendingTasks: this.tasks.length,
|
|
activeTasks: busyWorkers
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Ensures that a minimum of minWorkers is up and running
|
|
* @protected
|
|
*/
|
|
Pool.prototype._ensureMinWorkers = function() {
|
|
if (this.minWorkers) {
|
|
for(var i = this.workers.length; i < this.minWorkers; i++) {
|
|
this.workers.push(this._createWorkerHandler());
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Helper function to create a new WorkerHandler and pass all options.
|
|
* @return {WorkerHandler}
|
|
* @private
|
|
*/
|
|
Pool.prototype._createWorkerHandler = function () {
|
|
return new WorkerHandler(this.script, {
|
|
forkArgs: this.forkArgs,
|
|
forkOpts: this.forkOpts,
|
|
debugPort: DEBUG_PORT_ALLOCATOR.nextAvailableStartingAt(this.debugPortStart),
|
|
workerType: this.workerType
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Ensure that the maxWorkers option is an integer >= 1
|
|
* @param {*} maxWorkers
|
|
* @returns {boolean} returns true maxWorkers has a valid value
|
|
*/
|
|
function validateMaxWorkers(maxWorkers) {
|
|
if (!isNumber(maxWorkers) || !isInteger(maxWorkers) || maxWorkers < 1) {
|
|
throw new TypeError('Option maxWorkers must be an integer number >= 1');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Ensure that the minWorkers option is an integer >= 0
|
|
* @param {*} minWorkers
|
|
* @returns {boolean} returns true when minWorkers has a valid value
|
|
*/
|
|
function validateMinWorkers(minWorkers) {
|
|
if (!isNumber(minWorkers) || !isInteger(minWorkers) || minWorkers < 0) {
|
|
throw new TypeError('Option minWorkers must be an integer number >= 0');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Test whether a variable is a number
|
|
* @param {*} value
|
|
* @returns {boolean} returns true when value is a number
|
|
*/
|
|
function isNumber(value) {
|
|
return typeof value === 'number';
|
|
}
|
|
|
|
/**
|
|
* Test whether a number is an integer
|
|
* @param {number} value
|
|
* @returns {boolean} Returns true if value is an integer
|
|
*/
|
|
function isInteger(value) {
|
|
return Math.round(value) == value;
|
|
}
|
|
|
|
module.exports = Pool;
|
|
|
|
|
|
/***/ }),
|
|
/* 5 */
|
|
/***/ (function(module, exports, __webpack_require__) {
|
|
|
|
"use strict";
|
|
|
|
|
|
var Promise = __webpack_require__(1);
|
|
var environment = __webpack_require__(0);
|
|
var requireFoolWebpack = __webpack_require__(2);
|
|
|
|
function ensureWorkerThreads() {
|
|
var WorkerThreads = tryRequireWorkerThreads()
|
|
if (!WorkerThreads) {
|
|
throw new Error('WorkerPool: workerType = \'thread\' is not supported, Node >= 11.7.0 required')
|
|
}
|
|
|
|
return WorkerThreads;
|
|
}
|
|
|
|
// check whether Worker is supported by the browser
|
|
function ensureWebWorker() {
|
|
// Workaround for a bug in PhantomJS (Or QtWebkit): https://github.com/ariya/phantomjs/issues/14534
|
|
if (typeof Worker !== 'function' && (typeof Worker !== 'object' || typeof Worker.prototype.constructor !== 'function')) {
|
|
throw new Error('WorkerPool: Web Workers not supported');
|
|
}
|
|
}
|
|
|
|
function tryRequireWorkerThreads() {
|
|
try {
|
|
return requireFoolWebpack('worker_threads');
|
|
} catch(error) {
|
|
if (typeof error === 'object' && error !== null && error.code === 'MODULE_NOT_FOUND') {
|
|
// no worker_threads available (old version of node.js)
|
|
return null;
|
|
} else {
|
|
throw error;
|
|
}
|
|
}
|
|
}
|
|
|
|
// get the default worker script
|
|
function getDefaultWorker() {
|
|
if (environment.platform === 'browser') {
|
|
// test whether the browser supports all features that we need
|
|
if (typeof Blob === 'undefined') {
|
|
throw new Error('Blob not supported by the browser');
|
|
}
|
|
if (!window.URL || typeof window.URL.createObjectURL !== 'function') {
|
|
throw new Error('URL.createObjectURL not supported by the browser');
|
|
}
|
|
|
|
// use embedded worker.js
|
|
var blob = new Blob([__webpack_require__(6)], {type: 'text/javascript'});
|
|
return window.URL.createObjectURL(blob);
|
|
}
|
|
else {
|
|
// use external worker.js in current directory
|
|
return __dirname + '/worker.js';
|
|
}
|
|
}
|
|
|
|
function setupWorker(script, options) {
|
|
if (options.workerType === 'web') { // browser only
|
|
ensureWebWorker();
|
|
return setupBrowserWorker(script, Worker);
|
|
} else if (options.workerType === 'thread') { // node.js only
|
|
WorkerThreads = ensureWorkerThreads();
|
|
return setupWorkerThreadWorker(script, WorkerThreads);
|
|
} else if (options.workerType === 'process' || !options.workerType) { // node.js only
|
|
return setupProcessWorker(script, resolveForkOptions(options), requireFoolWebpack('child_process'));
|
|
} else { // options.workerType === 'auto' or undefined
|
|
if (environment.platform === 'browser') {
|
|
ensureWebWorker();
|
|
return setupBrowserWorker(script, Worker);
|
|
}
|
|
else { // environment.platform === 'node'
|
|
var WorkerThreads = tryRequireWorkerThreads();
|
|
if (WorkerThreads) {
|
|
return setupWorkerThreadWorker(script, WorkerThreads);
|
|
} else {
|
|
return setupProcessWorker(script, resolveForkOptions(options), requireFoolWebpack('child_process'));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function setupBrowserWorker(script, Worker) {
|
|
// create the web worker
|
|
var worker = new Worker(script);
|
|
|
|
worker.isBrowserWorker = true;
|
|
// add node.js API to the web worker
|
|
worker.on = function (event, callback) {
|
|
this.addEventListener(event, function (message) {
|
|
callback(message.data);
|
|
});
|
|
};
|
|
worker.send = function (message) {
|
|
this.postMessage(message);
|
|
};
|
|
return worker;
|
|
}
|
|
|
|
function setupWorkerThreadWorker(script, WorkerThreads) {
|
|
var worker = new WorkerThreads.Worker(script, {
|
|
stdout: false, // automatically pipe worker.STDOUT to process.STDOUT
|
|
stderr: false // automatically pipe worker.STDERR to process.STDERR
|
|
});
|
|
worker.isWorkerThread = true;
|
|
// make the worker mimic a child_process
|
|
worker.send = function(message) {
|
|
this.postMessage(message);
|
|
};
|
|
|
|
worker.kill = function() {
|
|
this.terminate();
|
|
return true;
|
|
};
|
|
|
|
worker.disconnect = function() {
|
|
this.terminate();
|
|
};
|
|
|
|
return worker;
|
|
}
|
|
|
|
function setupProcessWorker(script, options, child_process) {
|
|
// no WorkerThreads, fallback to sub-process based workers
|
|
var worker = child_process.fork(
|
|
script,
|
|
options.forkArgs,
|
|
options.forkOpts
|
|
);
|
|
|
|
worker.isChildProcess = true;
|
|
return worker;
|
|
}
|
|
|
|
// add debug flags to child processes if the node inspector is active
|
|
function resolveForkOptions(opts) {
|
|
opts = opts || {};
|
|
|
|
var processExecArgv = process.execArgv.join(' ');
|
|
var inspectorActive = processExecArgv.indexOf('--inspect') !== -1;
|
|
var debugBrk = processExecArgv.indexOf('--debug-brk') !== -1;
|
|
|
|
var execArgv = [];
|
|
if (inspectorActive) {
|
|
execArgv.push('--inspect=' + opts.debugPort);
|
|
|
|
if (debugBrk) {
|
|
execArgv.push('--debug-brk');
|
|
}
|
|
}
|
|
|
|
process.execArgv.forEach(function(arg) {
|
|
if (arg.indexOf('--max-old-space-size') > -1) {
|
|
execArgv.push(arg)
|
|
}
|
|
})
|
|
|
|
return Object.assign({}, opts, {
|
|
forkArgs: opts.forkArgs,
|
|
forkOpts: Object.assign({}, opts.forkOpts, {
|
|
execArgv: (opts.forkOpts && opts.forkOpts.execArgv || [])
|
|
.concat(execArgv)
|
|
})
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Converts a serialized error to Error
|
|
* @param {Object} obj Error that has been serialized and parsed to object
|
|
* @return {Error} The equivalent Error.
|
|
*/
|
|
function objectToError (obj) {
|
|
var temp = new Error('')
|
|
var props = Object.keys(obj)
|
|
|
|
for (var i = 0; i < props.length; i++) {
|
|
temp[props[i]] = obj[props[i]]
|
|
}
|
|
|
|
return temp
|
|
}
|
|
|
|
/**
|
|
* A WorkerHandler controls a single worker. This worker can be a child process
|
|
* on node.js or a WebWorker in a browser environment.
|
|
* @param {String} [script] If no script is provided, a default worker with a
|
|
* function run will be created.
|
|
* @param {WorkerPoolOptions} _options See docs
|
|
* @constructor
|
|
*/
|
|
function WorkerHandler(script, _options) {
|
|
var me = this;
|
|
var options = _options || {};
|
|
|
|
this.script = script || getDefaultWorker();
|
|
this.worker = setupWorker(this.script, options);
|
|
this.debugPort = options.debugPort;
|
|
|
|
// The ready message is only sent if the worker.add method is called (And the default script is not used)
|
|
if (!script) {
|
|
this.worker.ready = true;
|
|
}
|
|
|
|
// queue for requests that are received before the worker is ready
|
|
this.requestQueue = [];
|
|
this.worker.on('message', function (response) {
|
|
if (typeof response === 'string' && response === 'ready') {
|
|
me.worker.ready = true;
|
|
dispatchQueuedRequests();
|
|
} else {
|
|
// find the task from the processing queue, and run the tasks callback
|
|
var id = response.id;
|
|
var task = me.processing[id];
|
|
if (task !== undefined) {
|
|
// remove the task from the queue
|
|
delete me.processing[id];
|
|
|
|
// test if we need to terminate
|
|
if (me.terminating === true) {
|
|
// complete worker termination if all tasks are finished
|
|
me.terminate();
|
|
}
|
|
|
|
// resolve the task's promise
|
|
if (response.error) {
|
|
task.resolver.reject(objectToError(response.error));
|
|
}
|
|
else {
|
|
task.resolver.resolve(response.result);
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
// reject all running tasks on worker error
|
|
function onError(error) {
|
|
me.terminated = true;
|
|
|
|
for (var id in me.processing) {
|
|
if (me.processing[id] !== undefined) {
|
|
me.processing[id].resolver.reject(error);
|
|
}
|
|
}
|
|
me.processing = Object.create(null);
|
|
}
|
|
|
|
// send all queued requests to worker
|
|
function dispatchQueuedRequests()
|
|
{
|
|
me.requestQueue.forEach(me.worker.send.bind(me.worker));
|
|
me.requestQueue = [];
|
|
}
|
|
|
|
var worker = this.worker;
|
|
// listen for worker messages error and exit
|
|
this.worker.on('error', onError);
|
|
this.worker.on('exit', function (exitCode, signalCode) {
|
|
var message = 'Workerpool Worker terminated Unexpectedly\n';
|
|
|
|
message += ' exitCode: `' + exitCode + '`\n';
|
|
message += ' signalCode: `' + signalCode + '`\n';
|
|
|
|
message += ' workerpool.script: `' + me.script + '`\n';
|
|
message += ' spawnArgs: `' + worker.spawnargs + '`\n';
|
|
message += ' spawnfile: `' + worker.spawnfile + '`\n'
|
|
|
|
message += ' stdout: `' + worker.stdout + '`\n'
|
|
message += ' stderr: `' + worker.stderr + '`\n'
|
|
|
|
onError(new Error(message));
|
|
});
|
|
|
|
this.processing = Object.create(null); // queue with tasks currently in progress
|
|
|
|
this.terminating = false;
|
|
this.terminated = false;
|
|
this.terminationHandler = null;
|
|
this.lastId = 0;
|
|
}
|
|
|
|
/**
|
|
* Get a list with methods available on the worker.
|
|
* @return {Promise.<String[], Error>} methods
|
|
*/
|
|
WorkerHandler.prototype.methods = function () {
|
|
return this.exec('methods');
|
|
};
|
|
|
|
/**
|
|
* Execute a method with given parameters on the worker
|
|
* @param {String} method
|
|
* @param {Array} [params]
|
|
* @param {{resolve: Function, reject: Function}} [resolver]
|
|
* @return {Promise.<*, Error>} result
|
|
*/
|
|
WorkerHandler.prototype.exec = function(method, params, resolver) {
|
|
if (!resolver) {
|
|
resolver = Promise.defer();
|
|
}
|
|
|
|
// generate a unique id for the task
|
|
var id = ++this.lastId;
|
|
|
|
// register a new task as being in progress
|
|
this.processing[id] = {
|
|
id: id,
|
|
resolver: resolver
|
|
};
|
|
|
|
// build a JSON-RPC request
|
|
var request = {
|
|
id: id,
|
|
method: method,
|
|
params: params
|
|
};
|
|
|
|
if (this.terminated) {
|
|
resolver.reject(new Error('Worker is terminated'));
|
|
} else if (this.worker.ready) {
|
|
// send the request to the worker
|
|
this.worker.send(request);
|
|
} else {
|
|
this.requestQueue.push(request);
|
|
}
|
|
|
|
// on cancellation, force the worker to terminate
|
|
var me = this;
|
|
return resolver.promise.catch(function (error) {
|
|
if (error instanceof Promise.CancellationError || error instanceof Promise.TimeoutError) {
|
|
// remove this task from the queue. It is already rejected (hence this
|
|
// catch event), and else it will be rejected again when terminating
|
|
delete me.processing[id];
|
|
|
|
// terminate worker
|
|
return me.terminateAndNotify(true)
|
|
.then(function() {
|
|
throw error;
|
|
}, function(err) {
|
|
throw err;
|
|
});
|
|
} else {
|
|
throw error;
|
|
}
|
|
})
|
|
};
|
|
|
|
/**
|
|
* Test whether the worker is working or not
|
|
* @return {boolean} Returns true if the worker is busy
|
|
*/
|
|
WorkerHandler.prototype.busy = function () {
|
|
return Object.keys(this.processing).length > 0;
|
|
};
|
|
|
|
/**
|
|
* Terminate the worker.
|
|
* @param {boolean} [force=false] If false (default), the worker is terminated
|
|
* after finishing all tasks currently in
|
|
* progress. If true, the worker will be
|
|
* terminated immediately.
|
|
* @param {function} [callback=null] If provided, will be called when process terminates.
|
|
*/
|
|
WorkerHandler.prototype.terminate = function (force, callback) {
|
|
var me = this;
|
|
if (force) {
|
|
// cancel all tasks in progress
|
|
for (var id in this.processing) {
|
|
if (this.processing[id] !== undefined) {
|
|
this.processing[id].resolver.reject(new Error('Worker terminated'));
|
|
}
|
|
}
|
|
this.processing = Object.create(null);
|
|
}
|
|
|
|
if (typeof callback === 'function') {
|
|
this.terminationHandler = callback;
|
|
}
|
|
if (!this.busy()) {
|
|
// all tasks are finished. kill the worker
|
|
var cleanup = function(err) {
|
|
me.terminated = true;
|
|
me.worker = null;
|
|
me.terminating = false;
|
|
if (me.terminationHandler) {
|
|
me.terminationHandler(err, me);
|
|
} else if (err) {
|
|
throw err;
|
|
}
|
|
}
|
|
|
|
if (this.worker) {
|
|
if (typeof this.worker.kill === 'function') {
|
|
// child process
|
|
if (!this.worker.killed && !this.worker.kill()) {
|
|
cleanup(new Error('Failed to send SIGTERM to worker'));
|
|
} else {
|
|
// cleanup once the child process has exited
|
|
this.worker.once('exit', function() {
|
|
cleanup();
|
|
});
|
|
}
|
|
return;
|
|
}
|
|
else if (typeof this.worker.terminate === 'function') {
|
|
this.worker.terminate(); // web worker
|
|
this.worker.killed = true;
|
|
}
|
|
else {
|
|
throw new Error('Failed to terminate worker');
|
|
}
|
|
}
|
|
cleanup();
|
|
}
|
|
else {
|
|
// we can't terminate immediately, there are still tasks being executed
|
|
this.terminating = true;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Terminate the worker, returning a Promise that resolves when the termination has been done.
|
|
* @param {boolean} [force=false] If false (default), the worker is terminated
|
|
* after finishing all tasks currently in
|
|
* progress. If true, the worker will be
|
|
* terminated immediately.
|
|
* @param {number} [timeout] If provided and non-zero, worker termination promise will be rejected
|
|
* after timeout if worker process has not been terminated.
|
|
* @return {Promise.<WorkerHandler, Error>}
|
|
*/
|
|
WorkerHandler.prototype.terminateAndNotify = function (force, timeout) {
|
|
var resolver = Promise.defer();
|
|
if (timeout) {
|
|
resolver.promise.timeout = timeout;
|
|
}
|
|
this.terminate(force, function(err, worker) {
|
|
if (err) {
|
|
resolver.reject(err);
|
|
} else {
|
|
resolver.resolve(worker);
|
|
}
|
|
});
|
|
return resolver.promise;
|
|
};
|
|
|
|
module.exports = WorkerHandler;
|
|
module.exports._tryRequireWorkerThreads = tryRequireWorkerThreads;
|
|
module.exports._setupProcessWorker = setupProcessWorker;
|
|
module.exports._setupBrowserWorker = setupBrowserWorker;
|
|
module.exports._setupWorkerThreadWorker = setupWorkerThreadWorker;
|
|
module.exports.ensureWorkerThreads = ensureWorkerThreads;
|
|
|
|
|
|
/***/ }),
|
|
/* 6 */
|
|
/***/ (function(module, exports) {
|
|
|
|
/**
|
|
* embeddedWorker.js contains an embedded version of worker.js.
|
|
* This file is automatically generated,
|
|
* changes made in this file will be overwritten.
|
|
*/
|
|
module.exports = "!function(o){var n={};function t(e){if(n[e])return n[e].exports;var r=n[e]={i:e,l:!1,exports:{}};return o[e].call(r.exports,r,r.exports,t),r.l=!0,r.exports}t.m=o,t.c=n,t.d=function(e,r,o){t.o(e,r)||Object.defineProperty(e,r,{enumerable:!0,get:o})},t.r=function(e){\"undefined\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:\"Module\"}),Object.defineProperty(e,\"__esModule\",{value:!0})},t.t=function(r,e){if(1&e&&(r=t(r)),8&e)return r;if(4&e&&\"object\"==typeof r&&r&&r.__esModule)return r;var o=Object.create(null);if(t.r(o),Object.defineProperty(o,\"default\",{enumerable:!0,value:r}),2&e&&\"string\"!=typeof r)for(var n in r)t.d(o,n,function(e){return r[e]}.bind(null,n));return o},t.n=function(e){var r=e&&e.__esModule?function(){return e.default}:function(){return e};return t.d(r,\"a\",r),r},t.o=function(e,r){return Object.prototype.hasOwnProperty.call(e,r)},t.p=\"\",t(t.s=0)}([function(module,exports,__webpack_require__){var requireFoolWebpack=eval(\"typeof require !== 'undefined' ? require : function (module) { throw new Error('Module \\\" + module + \\\" not found.') }\"),worker={},WorkerThreads,parentPort;if(\"undefined\"!=typeof self&&\"function\"==typeof postMessage&&\"function\"==typeof addEventListener)worker.on=function(e,r){addEventListener(e,function(e){r(e.data)})},worker.send=function(e){postMessage(e)};else{if(\"undefined\"==typeof process)throw new Error(\"Script must be executed as a worker\");try{WorkerThreads=requireFoolWebpack(\"worker_threads\")}catch(e){if(\"object\"!=typeof e||null===e||\"MODULE_NOT_FOUND\"!==e.code)throw e}WorkerThreads&&null!==WorkerThreads.parentPort?(parentPort=WorkerThreads.parentPort,worker.send=parentPort.postMessage.bind(parentPort),worker.on=parentPort.on.bind(parentPort)):(worker.on=process.on.bind(process),worker.send=process.send.bind(process),worker.on(\"disconnect\",function(){process.exit(1)}))}function convertError(o){return Object.getOwnPropertyNames(o).reduce(function(e,r){return Object.defineProperty(e,r,{value:o[r],enumerable:!0})},{})}function isPromise(e){return e&&\"function\"==typeof e.then&&\"function\"==typeof e.catch}worker.methods={},worker.methods.run=function run(fn,args){var f=eval(\"(\"+fn+\")\");return f.apply(f,args)},worker.methods.methods=function(){return Object.keys(worker.methods)},worker.on(\"message\",function(r){try{var e=worker.methods[r.method];if(!e)throw new Error('Unknown method \"'+r.method+'\"');e=e.apply(e,r.params);isPromise(e)?e.then(function(e){worker.send({id:r.id,result:e,error:null})}).catch(function(e){worker.send({id:r.id,result:null,error:convertError(e)})}):worker.send({id:r.id,result:e,error:null})}catch(e){worker.send({id:r.id,result:null,error:convertError(e)})}}),worker.register=function(e){if(e)for(var r in e)e.hasOwnProperty(r)&&(worker.methods[r]=e[r]);worker.send(\"ready\")},exports.add=worker.register}]);";
|
|
|
|
|
|
/***/ }),
|
|
/* 7 */
|
|
/***/ (function(module, exports, __webpack_require__) {
|
|
|
|
"use strict";
|
|
|
|
|
|
var MAX_PORTS = 65535;
|
|
module.exports = DebugPortAllocator;
|
|
function DebugPortAllocator() {
|
|
this.ports = Object.create(null);
|
|
this.length = 0;
|
|
}
|
|
|
|
DebugPortAllocator.prototype.nextAvailableStartingAt = function(starting) {
|
|
while (this.ports[starting] === true) {
|
|
starting++;
|
|
}
|
|
|
|
if (starting >= MAX_PORTS) {
|
|
throw new Error('WorkerPool debug port limit reached: ' + starting + '>= ' + MAX_PORTS );
|
|
}
|
|
|
|
this.ports[starting] = true;
|
|
this.length++;
|
|
return starting;
|
|
};
|
|
|
|
DebugPortAllocator.prototype.releasePort = function(port) {
|
|
delete this.ports[port];
|
|
this.length--;
|
|
};
|
|
|
|
|
|
|
|
/***/ }),
|
|
/* 8 */
|
|
/***/ (function(module, exports, __webpack_require__) {
|
|
|
|
/**
|
|
* worker must be started as a child process or a web worker.
|
|
* It listens for RPC messages from the parent process.
|
|
*/
|
|
|
|
// source of inspiration: https://github.com/sindresorhus/require-fool-webpack
|
|
var requireFoolWebpack = eval(
|
|
'typeof require !== \'undefined\'' +
|
|
' ? require' +
|
|
' : function (module) { throw new Error(\'Module " + module + " not found.\') }'
|
|
);
|
|
|
|
// create a worker API for sending and receiving messages which works both on
|
|
// node.js and in the browser
|
|
var worker = {};
|
|
if (typeof self !== 'undefined' && typeof postMessage === 'function' && typeof addEventListener === 'function') {
|
|
// worker in the browser
|
|
worker.on = function (event, callback) {
|
|
addEventListener(event, function (message) {
|
|
callback(message.data);
|
|
})
|
|
};
|
|
worker.send = function (message) {
|
|
postMessage(message);
|
|
};
|
|
}
|
|
else if (typeof process !== 'undefined') {
|
|
// node.js
|
|
|
|
var WorkerThreads;
|
|
try {
|
|
WorkerThreads = requireFoolWebpack('worker_threads');
|
|
} catch(error) {
|
|
if (typeof error === 'object' && error !== null && error.code === 'MODULE_NOT_FOUND') {
|
|
// no worker_threads, fallback to sub-process based workers
|
|
} else {
|
|
throw error;
|
|
}
|
|
}
|
|
|
|
if (WorkerThreads &&
|
|
/* if there is a parentPort, we are in a WorkerThread */
|
|
WorkerThreads.parentPort !== null) {
|
|
var parentPort = WorkerThreads.parentPort;
|
|
worker.send = parentPort.postMessage.bind(parentPort);
|
|
worker.on = parentPort.on.bind(parentPort);
|
|
} else {
|
|
worker.on = process.on.bind(process);
|
|
worker.send = process.send.bind(process);
|
|
// register disconnect handler only for subprocess worker to exit when parent is killed unexpectedly
|
|
worker.on('disconnect', function () {
|
|
process.exit(1);
|
|
});
|
|
}
|
|
}
|
|
else {
|
|
throw new Error('Script must be executed as a worker');
|
|
}
|
|
|
|
function convertError(error) {
|
|
return Object.getOwnPropertyNames(error).reduce(function(product, name) {
|
|
return Object.defineProperty(product, name, {
|
|
value: error[name],
|
|
enumerable: true
|
|
});
|
|
}, {});
|
|
}
|
|
|
|
/**
|
|
* Test whether a value is a Promise via duck typing.
|
|
* @param {*} value
|
|
* @returns {boolean} Returns true when given value is an object
|
|
* having functions `then` and `catch`.
|
|
*/
|
|
function isPromise(value) {
|
|
return value && (typeof value.then === 'function') && (typeof value.catch === 'function');
|
|
}
|
|
|
|
// functions available externally
|
|
worker.methods = {};
|
|
|
|
/**
|
|
* Execute a function with provided arguments
|
|
* @param {String} fn Stringified function
|
|
* @param {Array} [args] Function arguments
|
|
* @returns {*}
|
|
*/
|
|
worker.methods.run = function run(fn, args) {
|
|
var f = eval('(' + fn + ')');
|
|
return f.apply(f, args);
|
|
};
|
|
|
|
/**
|
|
* Get a list with methods available on this worker
|
|
* @return {String[]} methods
|
|
*/
|
|
worker.methods.methods = function methods() {
|
|
return Object.keys(worker.methods);
|
|
};
|
|
|
|
worker.on('message', function (request) {
|
|
try {
|
|
var method = worker.methods[request.method];
|
|
|
|
if (method) {
|
|
// execute the function
|
|
var result = method.apply(method, request.params);
|
|
|
|
if (isPromise(result)) {
|
|
// promise returned, resolve this and then return
|
|
result
|
|
.then(function (result) {
|
|
worker.send({
|
|
id: request.id,
|
|
result: result,
|
|
error: null
|
|
});
|
|
})
|
|
.catch(function (err) {
|
|
worker.send({
|
|
id: request.id,
|
|
result: null,
|
|
error: convertError(err)
|
|
});
|
|
});
|
|
}
|
|
else {
|
|
// immediate result
|
|
worker.send({
|
|
id: request.id,
|
|
result: result,
|
|
error: null
|
|
});
|
|
}
|
|
}
|
|
else {
|
|
throw new Error('Unknown method "' + request.method + '"');
|
|
}
|
|
}
|
|
catch (err) {
|
|
worker.send({
|
|
id: request.id,
|
|
result: null,
|
|
error: convertError(err)
|
|
});
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Register methods to the worker
|
|
* @param {Object} methods
|
|
*/
|
|
worker.register = function (methods) {
|
|
|
|
if (methods) {
|
|
for (var name in methods) {
|
|
if (methods.hasOwnProperty(name)) {
|
|
worker.methods[name] = methods[name];
|
|
}
|
|
}
|
|
}
|
|
|
|
worker.send('ready');
|
|
|
|
};
|
|
|
|
if (true) {
|
|
exports.add = worker.register;
|
|
}
|
|
|
|
|
|
/***/ })
|
|
/******/ ]);
|
|
});
|
|
//# sourceMappingURL=workerpool.js.map
|