forked from jestjs/jest
-
Notifications
You must be signed in to change notification settings - Fork 3
/
BaseWorkerPool.ts
147 lines (123 loc) Β· 3.83 KB
/
BaseWorkerPool.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import mergeStream = require('merge-stream');
import {
CHILD_MESSAGE_CALL_SETUP,
CHILD_MESSAGE_END,
PoolExitResult,
WorkerInterface,
WorkerOptions,
WorkerPoolOptions,
} from '../types';
// How long to wait for the child process to terminate
// after CHILD_MESSAGE_END before sending force exiting.
const FORCE_EXIT_DELAY = 500;
/* istanbul ignore next */
// eslint-disable-next-line @typescript-eslint/no-empty-function
const emptyMethod = () => {};
export default class BaseWorkerPool {
private readonly _stderr: NodeJS.ReadableStream;
private readonly _stdout: NodeJS.ReadableStream;
protected readonly _options: WorkerPoolOptions;
private readonly _workers: Array<WorkerInterface>;
constructor(workerPath: string, options: WorkerPoolOptions) {
this._options = options;
this._workers = new Array(options.numWorkers);
const stdout = mergeStream();
const stderr = mergeStream();
const {forkOptions, maxRetries, resourceLimits, setupArgs} = options;
for (let i = 0; i < options.numWorkers; i++) {
const workerOptions: WorkerOptions = {
forkOptions,
idleMemoryLimit: this._options.idleMemoryLimit,
maxRetries,
resourceLimits,
setupArgs,
workerId: i,
workerPath,
};
const worker = this.createWorker(workerOptions);
const workerStdout = worker.getStdout();
const workerStderr = worker.getStderr();
if (workerStdout) {
stdout.add(workerStdout);
}
if (workerStderr) {
stderr.add(workerStderr);
}
this._workers[i] = worker;
}
this._stdout = stdout;
this._stderr = stderr;
}
getStderr(): NodeJS.ReadableStream {
return this._stderr;
}
getStdout(): NodeJS.ReadableStream {
return this._stdout;
}
getWorkers(): Array<WorkerInterface> {
return this._workers;
}
getWorkerById(workerId: number): WorkerInterface {
return this._workers[workerId];
}
createWorker(_workerOptions: WorkerOptions): WorkerInterface {
throw Error('Missing method createWorker in WorkerPool');
}
async start(): Promise<void> {
await Promise.all(
this._workers.map(
worker =>
new Promise<void>((resolve, reject) => {
worker.send(
[CHILD_MESSAGE_CALL_SETUP],
emptyMethod,
error => {
if (error) {
reject(error);
} else {
resolve();
}
},
emptyMethod,
);
}),
),
);
}
async end(): Promise<PoolExitResult> {
// We do not cache the request object here. If so, it would only be only
// processed by one of the workers, and we want them all to close.
const workerExitPromises = this._workers.map(async worker => {
worker.send(
[CHILD_MESSAGE_END, false],
emptyMethod,
emptyMethod,
emptyMethod,
);
// Schedule a force exit in case worker fails to exit gracefully so
// await worker.waitForExit() never takes longer than FORCE_EXIT_DELAY
let forceExited = false;
const forceExitTimeout = setTimeout(() => {
worker.forceExit();
forceExited = true;
}, FORCE_EXIT_DELAY);
await worker.waitForExit();
// Worker ideally exited gracefully, don't send force exit then
clearTimeout(forceExitTimeout);
return forceExited;
});
const workerExits = await Promise.all(workerExitPromises);
return workerExits.reduce<PoolExitResult>(
(result, forceExited) => ({
forceExited: result.forceExited || forceExited,
}),
{forceExited: false},
);
}
}