1 | 'use strict';
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2 |
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3 | Object.defineProperty(exports, '__esModule', {
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4 | value: true
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5 | });
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6 | exports.default = void 0;
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7 |
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8 | function _stream() {
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9 | const data = require('stream');
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10 |
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11 | _stream = function () {
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12 | return data;
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13 | };
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14 |
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15 | return data;
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16 | }
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17 |
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18 | var _types = require('../types');
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19 |
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20 |
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21 |
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22 |
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23 |
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24 |
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25 |
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26 | class WorkerAbstract extends _stream().EventEmitter {
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27 | |
28 |
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29 |
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30 |
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31 | #state = _types.WorkerStates.STARTING;
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32 | _fakeStream = null;
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33 | _exitPromise;
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34 | _resolveExitPromise;
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35 | _workerReadyPromise;
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36 | _resolveWorkerReady;
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37 |
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38 | get state() {
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39 | return this.#state;
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40 | }
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41 |
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42 | set state(value) {
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43 | if (this.#state !== value) {
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44 | const oldState = this.#state;
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45 | this.#state = value;
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46 | this.emit(_types.WorkerEvents.STATE_CHANGE, value, oldState);
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47 | }
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48 | }
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49 |
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50 | constructor(options) {
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51 | super();
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52 |
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53 | if (typeof options.on === 'object') {
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54 | for (const [event, handlers] of Object.entries(options.on)) {
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55 |
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56 |
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57 | if (typeof handlers === 'function') {
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58 | super.on(event, handlers);
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59 | } else {
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60 | for (const handler of handlers) {
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61 | super.on(event, handler);
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62 | }
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63 | }
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64 | }
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65 | }
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66 |
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67 | this._exitPromise = new Promise(resolve => {
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68 | this._resolveExitPromise = resolve;
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69 | });
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70 |
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71 | this._exitPromise.then(() => {
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72 | this.state = _types.WorkerStates.SHUT_DOWN;
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73 | });
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74 | }
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75 | |
76 |
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77 |
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78 |
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79 |
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80 |
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81 | waitForWorkerReady() {
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82 | if (!this._workerReadyPromise) {
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83 | this._workerReadyPromise = new Promise((resolve, reject) => {
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84 | let settled = false;
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85 | let to;
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86 |
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87 | switch (this.state) {
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88 | case _types.WorkerStates.OUT_OF_MEMORY:
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89 | case _types.WorkerStates.SHUTTING_DOWN:
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90 | case _types.WorkerStates.SHUT_DOWN:
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91 | settled = true;
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92 | reject(
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93 | new Error(
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94 | `Worker state means it will never be ready: ${this.state}`
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95 | )
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96 | );
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97 | break;
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98 |
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99 | case _types.WorkerStates.STARTING:
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100 | case _types.WorkerStates.RESTARTING:
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101 | this._resolveWorkerReady = () => {
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102 | settled = true;
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103 | resolve();
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104 |
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105 | if (to) {
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106 | clearTimeout(to);
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107 | }
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108 | };
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109 |
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110 | break;
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111 |
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112 | case _types.WorkerStates.OK:
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113 | settled = true;
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114 | resolve();
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115 | break;
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116 | }
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117 |
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118 | if (!settled) {
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119 | to = setTimeout(() => {
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120 | if (!settled) {
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121 | reject(new Error('Timeout starting worker'));
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122 | }
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123 | }, 500);
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124 | }
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125 | });
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126 | }
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127 |
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128 | return this._workerReadyPromise;
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129 | }
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130 | |
131 |
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132 |
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133 |
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134 |
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135 | _shutdown() {
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136 | this.state === _types.WorkerStates.SHUT_DOWN;
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137 |
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138 | if (this._fakeStream) {
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139 | this._fakeStream.end();
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140 |
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141 | this._fakeStream = null;
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142 | }
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143 |
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144 | this._resolveExitPromise();
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145 | }
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146 |
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147 | _getFakeStream() {
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148 | if (!this._fakeStream) {
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149 | this._fakeStream = new (_stream().PassThrough)();
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150 | }
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151 |
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152 | return this._fakeStream;
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153 | }
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154 | }
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155 |
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156 | exports.default = WorkerAbstract;
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