/
NodeThreadsWorker.ts
164 lines (137 loc) · 4.23 KB
/
NodeThreadsWorker.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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import path from 'path';
// ESLint doesn't know about this experimental module
// eslint-disable-next-line import/no-unresolved
import {Worker} from 'worker_threads';
import {
CHILD_MESSAGE_INITIALIZE,
PARENT_MESSAGE_OK,
PARENT_MESSAGE_CLIENT_ERROR,
PARENT_MESSAGE_SETUP_ERROR,
ChildMessage,
OnEnd,
OnStart,
WorkerOptions,
WorkerInterface,
ParentMessage,
} from '../types';
export default class ExperimentalWorker implements WorkerInterface {
private _worker!: Worker;
private _options: WorkerOptions;
private _onProcessEnd!: OnEnd;
private _request: ChildMessage | null;
private _retries!: number;
constructor(options: WorkerOptions) {
this._options = options;
this._request = null;
this.initialize();
}
initialize() {
this._worker = new Worker(path.resolve(__dirname, './threadChild.js'), {
eval: false,
stderr: true,
stdout: true,
workerData: {
cwd: process.cwd(),
env: {
...process.env,
JEST_WORKER_ID: String(this._options.workerId),
} as NodeJS.ProcessEnv,
// Suppress --debug / --inspect flags while preserving others (like --harmony).
execArgv: process.execArgv.filter(v => !/^--(debug|inspect)/.test(v)),
silent: true,
...this._options.forkOptions,
},
});
this._worker.on('message', this.onMessage.bind(this));
this._worker.on('exit', this.onExit.bind(this));
this._worker.postMessage([
CHILD_MESSAGE_INITIALIZE,
false,
this._options.workerPath,
this._options.setupArgs,
]);
this._retries++;
// If we exceeded the amount of retries, we will emulate an error reply
// coming from the child. This avoids code duplication related with cleaning
// the queue, and scheduling the next call.
if (this._retries > this._options.maxRetries) {
const error = new Error('Call retries were exceeded');
this.onMessage([
PARENT_MESSAGE_CLIENT_ERROR,
error.name,
error.message,
error.stack!,
{type: 'WorkerError'},
]);
}
}
onMessage(response: ParentMessage) {
let error;
switch (response[0]) {
case PARENT_MESSAGE_OK:
this._onProcessEnd(null, response[1]);
break;
case PARENT_MESSAGE_CLIENT_ERROR:
error = response[4];
if (error != null && typeof error === 'object') {
const extra = error;
// @ts-ignore: no index
const NativeCtor = global[response[1]];
const Ctor = typeof NativeCtor === 'function' ? NativeCtor : Error;
error = new Ctor(response[2]);
error.type = response[1];
error.stack = response[3];
for (const key in extra) {
// @ts-ignore: no index
error[key] = extra[key];
}
}
this._onProcessEnd(error, null);
break;
case PARENT_MESSAGE_SETUP_ERROR:
error = new Error('Error when calling setup: ' + response[2]);
// @ts-ignore: adding custom properties to errors.
error.type = response[1];
error.stack = response[3];
this._onProcessEnd(error, null);
break;
default:
throw new TypeError('Unexpected response from worker: ' + response[0]);
}
}
onExit(exitCode: number) {
if (exitCode !== 0) {
this.initialize();
if (this._request) {
this._worker.postMessage(this._request);
}
}
}
send(request: ChildMessage, onProcessStart: OnStart, onProcessEnd: OnEnd) {
onProcessStart(this);
this._onProcessEnd = (...args) => {
// Clean the request to avoid sending past requests to workers that fail
// while waiting for a new request (timers, unhandled rejections...)
this._request = null;
return onProcessEnd(...args);
};
this._request = request;
this._retries = 0;
this._worker.postMessage(request);
}
getWorkerId() {
return this._options.workerId;
}
getStdout() {
return this._worker.stdout;
}
getStderr() {
return this._worker.stderr;
}
}