1 | 'use strict';
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2 |
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3 | function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }
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4 |
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5 | var _require = require('events');
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6 |
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7 | const EventEmitter = _require.EventEmitter;
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8 |
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9 | const os = require('os');
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10 | const Farm = require('worker-farm/lib/farm');
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11 | const promisify = require('./utils/promisify');
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12 | const logger = require('./Logger');
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13 |
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14 | let shared = null;
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15 |
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16 | class WorkerFarm extends Farm {
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17 | constructor(options) {
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18 | let opts = {
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19 | maxConcurrentWorkers: getNumWorkers()
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20 | };
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21 |
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22 | let workerPath = parseInt(process.versions.node, 10) < 8 ? require.resolve('../lib/worker') : require.resolve('../src/worker');
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23 |
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24 | super(opts, workerPath);
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25 |
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26 | this.localWorker = this.promisifyWorker(require('./worker'));
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27 | this.remoteWorker = this.promisifyWorker(this.setup(['init', 'run']));
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28 |
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29 | this.started = false;
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30 | this.warmWorkers = 0;
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31 | this.init(options);
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32 | }
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33 |
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34 | init(options) {
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35 | this.localWorker.init(options);
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36 | this.initRemoteWorkers(options);
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37 | }
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38 |
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39 | promisifyWorker(worker) {
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40 | let res = {};
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41 |
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42 | for (let key in worker) {
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43 | res[key] = promisify(worker[key].bind(worker));
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44 | }
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45 |
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46 | return res;
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47 | }
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48 |
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49 | initRemoteWorkers(options) {
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50 | var _this = this;
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51 |
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52 | return _asyncToGenerator(function* () {
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53 | _this.started = false;
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54 | _this.warmWorkers = 0;
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55 |
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56 | let promises = [];
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57 | for (let i = 0; i < _this.options.maxConcurrentWorkers; i++) {
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58 | promises.push(_this.remoteWorker.init(options));
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59 | }
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60 |
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61 | yield Promise.all(promises);
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62 | if (_this.options.maxConcurrentWorkers > 0) {
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63 | _this.started = true;
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64 | }
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65 | })();
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66 | }
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67 |
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68 | receive(data) {
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69 | if (data.event) {
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70 | this.emit(data.event, ...data.args);
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71 | } else if (data.type === 'logger') {
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72 | if (this.shouldUseRemoteWorkers()) {
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73 | logger.handleMessage(data);
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74 | }
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75 | } else if (this.children[data.child]) {
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76 | super.receive(data);
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77 | }
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78 | }
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79 |
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80 | shouldUseRemoteWorkers() {
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81 | return this.started && this.warmWorkers >= this.activeChildren;
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82 | }
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83 |
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84 | run(...args) {
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85 | var _this2 = this;
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86 |
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87 | return _asyncToGenerator(function* () {
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88 |
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89 |
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90 |
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91 | if (_this2.shouldUseRemoteWorkers()) {
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92 | return _this2.remoteWorker.run(...args, false);
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93 | } else {
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94 |
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95 |
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96 |
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97 | if (_this2.started) {
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98 | _this2.remoteWorker.run(...args, true).then(function () {
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99 | _this2.warmWorkers++;
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100 | }, function () {
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101 |
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102 | });
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103 | }
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104 |
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105 | return _this2.localWorker.run(...args, false);
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106 | }
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107 | })();
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108 | }
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109 |
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110 | end() {
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111 |
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112 | this.ending = true;
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113 | for (let child in this.children) {
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114 | this.stopChild(child);
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115 | }
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116 |
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117 | this.ending = false;
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118 | shared = null;
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119 | }
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120 |
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121 | static getShared(options) {
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122 | if (!shared) {
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123 | shared = new WorkerFarm(options);
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124 | } else {
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125 | shared.init(options);
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126 | }
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127 |
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128 | return shared;
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129 | }
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130 | }
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131 |
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132 | for (let key in EventEmitter.prototype) {
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133 | WorkerFarm.prototype[key] = EventEmitter.prototype[key];
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134 | }
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135 |
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136 | function getNumWorkers() {
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137 | if (process.env.PARCEL_WORKERS) {
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138 | return parseInt(process.env.PARCEL_WORKERS, 10);
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139 | }
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140 |
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141 | let cores;
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142 | try {
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143 | cores = require('physical-cpu-count');
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144 | } catch (err) {
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145 | cores = os.cpus().length;
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146 | }
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147 | return cores || 1;
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148 | }
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149 |
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150 | module.exports = WorkerFarm; |
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