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Filename : index.js
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'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
Object.defineProperty(exports, 'FifoQueue', {
  enumerable: true,
  get: function () {
    return _FifoQueue.default;
  }
});
Object.defineProperty(exports, 'PriorityQueue', {
  enumerable: true,
  get: function () {
    return _PriorityQueue.default;
  }
});
exports.Worker = void 0;
Object.defineProperty(exports, 'messageParent', {
  enumerable: true,
  get: function () {
    return _messageParent.default;
  }
});

function _os() {
  const data = require('os');

  _os = function () {
    return data;
  };

  return data;
}

var _Farm = _interopRequireDefault(require('./Farm'));

var _WorkerPool = _interopRequireDefault(require('./WorkerPool'));

var _PriorityQueue = _interopRequireDefault(require('./PriorityQueue'));

var _FifoQueue = _interopRequireDefault(require('./FifoQueue'));

var _messageParent = _interopRequireDefault(require('./workers/messageParent'));

function _interopRequireDefault(obj) {
  return obj && obj.__esModule ? obj : {default: obj};
}

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }
  return obj;
}

function getExposedMethods(workerPath, options) {
  let exposedMethods = options.exposedMethods; // If no methods list is given, try getting it by auto-requiring the module.

  if (!exposedMethods) {
    const module = require(workerPath);

    exposedMethods = Object.keys(module).filter(
      // @ts-expect-error: no index
      name => typeof module[name] === 'function'
    );

    if (typeof module === 'function') {
      exposedMethods = [...exposedMethods, 'default'];
    }
  }

  return exposedMethods;
}
/**
 * The Jest farm (publicly called "Worker") is a class that allows you to queue
 * methods across multiple child processes, in order to parallelize work. This
 * is done by providing an absolute path to a module that will be loaded on each
 * of the child processes, and bridged to the main process.
 *
 * Bridged methods are specified by using the "exposedMethods" property of the
 * "options" object. This is an array of strings, where each of them corresponds
 * to the exported name in the loaded module.
 *
 * You can also control the amount of workers by using the "numWorkers" property
 * of the "options" object, and the settings passed to fork the process through
 * the "forkOptions" property. The amount of workers defaults to the amount of
 * CPUS minus one.
 *
 * Queueing calls can be done in two ways:
 *   - Standard method: calls will be redirected to the first available worker,
 *     so they will get executed as soon as they can.
 *
 *   - Sticky method: if a "computeWorkerKey" method is provided within the
 *     config, the resulting string of this method will be used as a key.
 *     Every time this key is returned, it is guaranteed that your job will be
 *     processed by the same worker. This is specially useful if your workers
 *     are caching results.
 */

class Worker {
  constructor(workerPath, options) {
    var _this$_options$enable,
      _this$_options$forkOp,
      _this$_options$maxRet,
      _this$_options$numWor,
      _this$_options$resour,
      _this$_options$setupA;

    _defineProperty(this, '_ending', void 0);

    _defineProperty(this, '_farm', void 0);

    _defineProperty(this, '_options', void 0);

    _defineProperty(this, '_workerPool', void 0);

    this._options = {...options};
    this._ending = false;
    const workerPoolOptions = {
      enableWorkerThreads:
        (_this$_options$enable = this._options.enableWorkerThreads) !== null &&
        _this$_options$enable !== void 0
          ? _this$_options$enable
          : false,
      forkOptions:
        (_this$_options$forkOp = this._options.forkOptions) !== null &&
        _this$_options$forkOp !== void 0
          ? _this$_options$forkOp
          : {},
      maxRetries:
        (_this$_options$maxRet = this._options.maxRetries) !== null &&
        _this$_options$maxRet !== void 0
          ? _this$_options$maxRet
          : 3,
      numWorkers:
        (_this$_options$numWor = this._options.numWorkers) !== null &&
        _this$_options$numWor !== void 0
          ? _this$_options$numWor
          : Math.max((0, _os().cpus)().length - 1, 1),
      resourceLimits:
        (_this$_options$resour = this._options.resourceLimits) !== null &&
        _this$_options$resour !== void 0
          ? _this$_options$resour
          : {},
      setupArgs:
        (_this$_options$setupA = this._options.setupArgs) !== null &&
        _this$_options$setupA !== void 0
          ? _this$_options$setupA
          : []
    };

    if (this._options.WorkerPool) {
      // @ts-expect-error: constructor target any?
      this._workerPool = new this._options.WorkerPool(
        workerPath,
        workerPoolOptions
      );
    } else {
      this._workerPool = new _WorkerPool.default(workerPath, workerPoolOptions);
    }

    this._farm = new _Farm.default(
      workerPoolOptions.numWorkers,
      this._workerPool.send.bind(this._workerPool),
      {
        computeWorkerKey: this._options.computeWorkerKey,
        taskQueue: this._options.taskQueue,
        workerSchedulingPolicy: this._options.workerSchedulingPolicy
      }
    );

    this._bindExposedWorkerMethods(workerPath, this._options);
  }

  _bindExposedWorkerMethods(workerPath, options) {
    getExposedMethods(workerPath, options).forEach(name => {
      if (name.startsWith('_')) {
        return;
      }

      if (this.constructor.prototype.hasOwnProperty(name)) {
        throw new TypeError('Cannot define a method called ' + name);
      } // @ts-expect-error: dynamic extension of the class instance is expected.

      this[name] = this._callFunctionWithArgs.bind(this, name);
    });
  }

  _callFunctionWithArgs(method, ...args) {
    if (this._ending) {
      throw new Error('Farm is ended, no more calls can be done to it');
    }

    return this._farm.doWork(method, ...args);
  }

  getStderr() {
    return this._workerPool.getStderr();
  }

  getStdout() {
    return this._workerPool.getStdout();
  }

  async end() {
    if (this._ending) {
      throw new Error('Farm is ended, no more calls can be done to it');
    }

    this._ending = true;
    return this._workerPool.end();
  }
}

exports.Worker = Worker;