117 lines
3.3 KiB
JavaScript
117 lines
3.3 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.default = void 0;
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function _mergeStream() {
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const data = _interopRequireDefault(require('merge-stream'));
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_mergeStream = function () {
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return data;
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};
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return data;
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}
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var _types = require('../types');
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function _interopRequireDefault(obj) {
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return obj && obj.__esModule ? obj : {default: obj};
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}
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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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// How long to wait for the child process to terminate
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// after CHILD_MESSAGE_END before sending force exiting.
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const FORCE_EXIT_DELAY = 500;
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/* istanbul ignore next */
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// eslint-disable-next-line @typescript-eslint/no-empty-function
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const emptyMethod = () => {};
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class BaseWorkerPool {
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_stderr;
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_stdout;
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_options;
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_workers;
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constructor(workerPath, options) {
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this._options = options;
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this._workers = new Array(options.numWorkers);
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const stdout = (0, _mergeStream().default)();
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const stderr = (0, _mergeStream().default)();
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const {forkOptions, maxRetries, resourceLimits, setupArgs} = options;
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for (let i = 0; i < options.numWorkers; i++) {
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const workerOptions = {
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forkOptions,
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idleMemoryLimit: this._options.idleMemoryLimit,
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maxRetries,
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resourceLimits,
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setupArgs,
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workerId: i,
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workerPath
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};
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const worker = this.createWorker(workerOptions);
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const workerStdout = worker.getStdout();
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const workerStderr = worker.getStderr();
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if (workerStdout) {
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stdout.add(workerStdout);
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}
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if (workerStderr) {
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stderr.add(workerStderr);
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}
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this._workers[i] = worker;
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}
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this._stdout = stdout;
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this._stderr = stderr;
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}
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getStderr() {
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return this._stderr;
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}
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getStdout() {
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return this._stdout;
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}
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getWorkers() {
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return this._workers;
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}
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getWorkerById(workerId) {
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return this._workers[workerId];
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}
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createWorker(_workerOptions) {
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throw Error('Missing method createWorker in WorkerPool');
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}
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async end() {
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// We do not cache the request object here. If so, it would only be only
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// processed by one of the workers, and we want them all to close.
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const workerExitPromises = this._workers.map(async worker => {
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worker.send(
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[_types.CHILD_MESSAGE_END, false],
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emptyMethod,
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emptyMethod,
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emptyMethod
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);
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// Schedule a force exit in case worker fails to exit gracefully so
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// await worker.waitForExit() never takes longer than FORCE_EXIT_DELAY
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let forceExited = false;
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const forceExitTimeout = setTimeout(() => {
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worker.forceExit();
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forceExited = true;
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}, FORCE_EXIT_DELAY);
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await worker.waitForExit();
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// Worker ideally exited gracefully, don't send force exit then
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clearTimeout(forceExitTimeout);
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return forceExited;
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});
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const workerExits = await Promise.all(workerExitPromises);
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return workerExits.reduce(
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(result, forceExited) => ({
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forceExited: result.forceExited || forceExited
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}),
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{
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forceExited: false
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}
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);
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}
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}
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exports.default = BaseWorkerPool;
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