/
processLauncher.ts
278 lines (247 loc) · 10 KB
/
processLauncher.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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/**
* Copyright 2017 Google Inc. All rights reserved.
* Modifications copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import fs from 'fs';
import * as childProcess from 'child_process';
import * as readline from 'readline';
import { isUnderTest } from './';
import { removeFolders } from './fileUtils';
export type Env = {[key: string]: string | number | boolean | undefined};
export type LaunchProcessOptions = {
command: string,
args?: string[],
env?: Env,
shell?: boolean,
handleSIGINT?: boolean,
handleSIGTERM?: boolean,
handleSIGHUP?: boolean,
stdio: 'pipe' | 'stdin',
tempDirectories: string[],
cwd?: string,
// Note: attemptToGracefullyClose should reject if it does not close the browser.
attemptToGracefullyClose: () => Promise<any>,
onExit: (exitCode: number | null, signal: string | null) => void,
log: (message: string) => void,
};
type LaunchResult = {
launchedProcess: childProcess.ChildProcess,
gracefullyClose: () => Promise<void>,
kill: () => Promise<void>,
};
export const gracefullyCloseSet = new Set<() => Promise<void>>();
const killSet = new Set<() => void>();
export async function gracefullyCloseAll() {
await Promise.all(Array.from(gracefullyCloseSet).map(gracefullyClose => gracefullyClose().catch(e => {})));
}
export function gracefullyProcessExitDoNotHang(code: number) {
// Force exit after 30 seconds.
// eslint-disable-next-line no-restricted-properties
setTimeout(() => process.exit(code), 30000);
// Meanwhile, try to gracefully close all browsers.
gracefullyCloseAll().then(() => {
// eslint-disable-next-line no-restricted-properties
process.exit(code);
});
}
function exitHandler() {
for (const kill of killSet)
kill();
}
let sigintHandlerCalled = false;
function sigintHandler() {
const exitWithCode130 = () => {
// Give tests a chance to see that launched process did exit and dispatch any async calls.
if (isUnderTest()) {
// eslint-disable-next-line no-restricted-properties
setTimeout(() => process.exit(130), 1000);
} else {
// eslint-disable-next-line no-restricted-properties
process.exit(130);
}
};
if (sigintHandlerCalled) {
// Resort to default handler from this point on, just in case we hang/stall.
process.off('SIGINT', sigintHandler);
// Upon second Ctrl+C, immediately kill browsers and exit.
// This prevents hanging in the case where closing the browser takes a lot of time or is buggy.
for (const kill of killSet)
kill();
exitWithCode130();
} else {
sigintHandlerCalled = true;
gracefullyCloseAll().then(() => exitWithCode130());
}
}
function sigtermHandler() {
gracefullyCloseAll();
}
function sighupHandler() {
gracefullyCloseAll();
}
const installedHandlers = new Set<'exit' | 'SIGINT' | 'SIGTERM' | 'SIGHUP'>();
const processHandlers = {
exit: exitHandler,
SIGINT: sigintHandler,
SIGTERM: sigtermHandler,
SIGHUP: sighupHandler,
};
function addProcessHandlerIfNeeded(name: 'exit' | 'SIGINT' | 'SIGTERM' | 'SIGHUP') {
if (!installedHandlers.has(name)) {
installedHandlers.add(name);
process.on(name, processHandlers[name]);
}
}
function removeProcessHandlersIfNeeded() {
if (killSet.size)
return;
for (const handler of installedHandlers)
process.off(handler, processHandlers[handler]);
installedHandlers.clear();
}
export async function launchProcess(options: LaunchProcessOptions): Promise<LaunchResult> {
const stdio: ('ignore' | 'pipe')[] = options.stdio === 'pipe' ? ['ignore', 'pipe', 'pipe', 'pipe', 'pipe'] : ['pipe', 'pipe', 'pipe'];
options.log(`<launching> ${options.command} ${options.args ? options.args.join(' ') : ''}`);
const spawnOptions: childProcess.SpawnOptions = {
// On non-windows platforms, `detached: true` makes child process a leader of a new
// process group, making it possible to kill child process tree with `.kill(-pid)` command.
// @see https://nodejs.org/api/child_process.html#child_process_options_detached
detached: process.platform !== 'win32',
env: (options.env as {[key: string]: string}),
cwd: options.cwd,
shell: options.shell,
stdio,
};
const spawnedProcess = childProcess.spawn(options.command, options.args || [], spawnOptions);
const cleanup = async () => {
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] starting temporary directories cleanup`);
const errors = await removeFolders(options.tempDirectories);
for (let i = 0; i < options.tempDirectories.length; ++i) {
if (errors[i])
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] exception while removing ${options.tempDirectories[i]}: ${errors[i]}`);
}
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] finished temporary directories cleanup`);
};
// Prevent Unhandled 'error' event.
spawnedProcess.on('error', () => {});
if (!spawnedProcess.pid) {
let failed: (e: Error) => void;
const failedPromise = new Promise<Error>((f, r) => failed = f);
spawnedProcess.once('error', error => {
failed(new Error('Failed to launch: ' + error));
});
return cleanup().then(() => failedPromise).then(e => Promise.reject(e));
}
options.log(`<launched> pid=${spawnedProcess.pid}`);
const stdout = readline.createInterface({ input: spawnedProcess.stdout! });
stdout.on('line', (data: string) => {
options.log(`[pid=${spawnedProcess.pid}][out] ` + data);
});
const stderr = readline.createInterface({ input: spawnedProcess.stderr! });
stderr.on('line', (data: string) => {
options.log(`[pid=${spawnedProcess.pid}][err] ` + data);
});
let processClosed = false;
let fulfillCleanup = () => {};
const waitForCleanup = new Promise<void>(f => fulfillCleanup = f);
spawnedProcess.once('exit', (exitCode, signal) => {
options.log(`[pid=${spawnedProcess.pid}] <process did exit: exitCode=${exitCode}, signal=${signal}>`);
processClosed = true;
gracefullyCloseSet.delete(gracefullyClose);
killSet.delete(killProcessAndCleanup);
removeProcessHandlersIfNeeded();
options.onExit(exitCode, signal);
// Cleanup as process exits.
cleanup().then(fulfillCleanup);
});
addProcessHandlerIfNeeded('exit');
if (options.handleSIGINT)
addProcessHandlerIfNeeded('SIGINT');
if (options.handleSIGTERM)
addProcessHandlerIfNeeded('SIGTERM');
if (options.handleSIGHUP)
addProcessHandlerIfNeeded('SIGHUP');
gracefullyCloseSet.add(gracefullyClose);
killSet.add(killProcessAndCleanup);
let gracefullyClosing = false;
async function gracefullyClose(): Promise<void> {
// We keep listeners until we are done, to handle 'exit' and 'SIGINT' while
// asynchronously closing to prevent zombie processes. This might introduce
// reentrancy to this function, for example user sends SIGINT second time.
// In this case, let's forcefully kill the process.
if (gracefullyClosing) {
options.log(`[pid=${spawnedProcess.pid}] <forcefully close>`);
killProcess();
await waitForCleanup; // Ensure the process is dead and we have cleaned up.
return;
}
gracefullyClosing = true;
options.log(`[pid=${spawnedProcess.pid}] <gracefully close start>`);
await options.attemptToGracefullyClose().catch(() => killProcess());
await waitForCleanup; // Ensure the process is dead and we have cleaned up.
options.log(`[pid=${spawnedProcess.pid}] <gracefully close end>`);
}
// This method has to be sync to be used in the 'exit' event handler.
function killProcess() {
gracefullyCloseSet.delete(gracefullyClose);
killSet.delete(killProcessAndCleanup);
removeProcessHandlersIfNeeded();
options.log(`[pid=${spawnedProcess.pid}] <kill>`);
if (spawnedProcess.pid && !spawnedProcess.killed && !processClosed) {
options.log(`[pid=${spawnedProcess.pid}] <will force kill>`);
// Force kill the browser.
try {
if (process.platform === 'win32') {
const taskkillProcess = childProcess.spawnSync(`taskkill /pid ${spawnedProcess.pid} /T /F`, { shell: true });
const [stdout, stderr] = [taskkillProcess.stdout.toString(), taskkillProcess.stderr.toString()];
if (stdout)
options.log(`[pid=${spawnedProcess.pid}] taskkill stdout: ${stdout}`);
if (stderr)
options.log(`[pid=${spawnedProcess.pid}] taskkill stderr: ${stderr}`);
} else {
process.kill(-spawnedProcess.pid, 'SIGKILL');
}
} catch (e) {
options.log(`[pid=${spawnedProcess.pid}] exception while trying to kill process: ${e}`);
// the process might have already stopped
}
} else {
options.log(`[pid=${spawnedProcess.pid}] <skipped force kill spawnedProcess.killed=${spawnedProcess.killed} processClosed=${processClosed}>`);
}
}
function killProcessAndCleanup() {
killProcess();
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] starting temporary directories cleanup`);
for (const dir of options.tempDirectories) {
try {
fs.rmSync(dir, { force: true, recursive: true, maxRetries: 5 });
} catch (e) {
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] exception while removing ${dir}: ${e}`);
}
}
options.log(`[pid=${spawnedProcess.pid || 'N/A'}] finished temporary directories cleanup`);
}
function killAndWait() {
killProcess();
return waitForCleanup;
}
return { launchedProcess: spawnedProcess, gracefullyClose, kill: killAndWait };
}
export function envArrayToObject(env: { name: string, value: string }[]): Env {
const result: Env = {};
for (const { name, value } of env)
result[name] = value;
return result;
}