helpyourneighbour/node_modules/workerpool/dist/worker.js

/**
 * workerpool.js
 * https://github.com/josdejong/workerpool
 *
 * Offload tasks to a pool of workers on node.js and in the browser.
 *
 * @version 6.5.1
 * @date    2023-10-11
 *
 * @license
 * Copyright (C) 2014-2022 Jos de Jong <wjosdejong@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy
 * of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

/******/ (function() { // webpackBootstrap
/******/ 	var __webpack_modules__ = ({

/***/ 577:
/***/ (function(module) {

/**
 * The helper class for transferring data from the worker to the main thread.
 *
 * @param {Object} message The object to deliver to the main thread.
 * @param {Object[]} transfer An array of transferable Objects to transfer ownership of.
 */
function Transfer(message, transfer) {
  this.message = message;
  this.transfer = transfer;
}
module.exports = Transfer;

/***/ })

/******/ 	});
/************************************************************************/
/******/ 	// The module cache
/******/ 	var __webpack_module_cache__ = {};
/******/ 	
/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {
/******/ 		// Check if module is in cache
/******/ 		var cachedModule = __webpack_module_cache__[moduleId];
/******/ 		if (cachedModule !== undefined) {
/******/ 			return cachedModule.exports;
/******/ 		}
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = __webpack_module_cache__[moduleId] = {
/******/ 			// no module.id needed
/******/ 			// no module.loaded needed
/******/ 			exports: {}
/******/ 		};
/******/ 	
/******/ 		// Execute the module function
/******/ 		__webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/ 	
/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}
/******/ 	
/************************************************************************/
var __webpack_exports__ = {};
// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
!function() {
var exports = __webpack_exports__;
var __webpack_unused_export__;
function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
/**
 * worker must be started as a child process or a web worker.
 * It listens for RPC messages from the parent process.
 */
var Transfer = __webpack_require__(577);

// 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.\') }');

/**
 * Special message sent by parent which causes the worker to terminate itself.
 * Not a "message object"; this string is the entire message.
 */
var TERMINATE_METHOD_ID = '__workerpool-terminate__';

// var nodeOSPlatform = require('./environment').nodeOSPlatform;

// create a worker API for sending and receiving messages which works both on
// node.js and in the browser
var worker = {
  exit: function exit() {}
};
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);
    worker.exit = process.exit.bind(process);
  } else {
    worker.on = process.on.bind(process);
    // ignore transfer argument since it is not supported by process
    worker.send = function (message) {
      process.send(message);
    };
    // register disconnect handler only for subprocess worker to exit when parent is killed unexpectedly
    worker.on('disconnect', function () {
      process.exit(1);
    });
    worker.exit = process.exit.bind(process);
  }
} 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 = new Function('return (' + fn + ').apply(null, arguments);');
  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);
};

/**
 * Custom handler for when the worker is terminated.
 */
worker.terminationHandler = undefined;

/**
 * Cleanup and exit the worker.
 * @param {Number} code 
 * @returns 
 */
worker.cleanupAndExit = function (code) {
  var _exit = function _exit() {
    worker.exit(code);
  };
  if (!worker.terminationHandler) {
    return _exit();
  }
  var result = worker.terminationHandler(code);
  if (isPromise(result)) {
    result.then(_exit, _exit);
  } else {
    _exit();
  }
};
var currentRequestId = null;
worker.on('message', function (request) {
  if (request === TERMINATE_METHOD_ID) {
    return worker.cleanupAndExit(0);
  }
  try {
    var method = worker.methods[request.method];
    if (method) {
      currentRequestId = request.id;

      // execute the function
      var result = method.apply(method, request.params);
      if (isPromise(result)) {
        // promise returned, resolve this and then return
        result.then(function (result) {
          if (result instanceof Transfer) {
            worker.send({
              id: request.id,
              result: result.message,
              error: null
            }, result.transfer);
          } else {
            worker.send({
              id: request.id,
              result: result,
              error: null
            });
          }
          currentRequestId = null;
        })["catch"](function (err) {
          worker.send({
            id: request.id,
            result: null,
            error: convertError(err)
          });
          currentRequestId = null;
        });
      } else {
        // immediate result
        if (result instanceof Transfer) {
          worker.send({
            id: request.id,
            result: result.message,
            error: null
          }, result.transfer);
        } else {
          worker.send({
            id: request.id,
            result: result,
            error: null
          });
        }
        currentRequestId = 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]
 * @param {WorkerRegisterOptions} [options]
 */
worker.register = function (methods, options) {
  if (methods) {
    for (var name in methods) {
      if (methods.hasOwnProperty(name)) {
        worker.methods[name] = methods[name];
      }
    }
  }
  if (options) {
    worker.terminationHandler = options.onTerminate;
  }
  worker.send('ready');
};
worker.emit = function (payload) {
  if (currentRequestId) {
    if (payload instanceof Transfer) {
      worker.send({
        id: currentRequestId,
        isEvent: true,
        payload: payload.message
      }, payload.transfer);
      return;
    }
    worker.send({
      id: currentRequestId,
      isEvent: true,
      payload: payload
    });
  }
};
if (true) {
  __webpack_unused_export__ = worker.register;
  __webpack_unused_export__ = worker.emit;
}
}();
/******/ })()
;
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