forked from irinazheltisheva/vscode
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathports.ts
More file actions
128 lines (111 loc) · 3.53 KB
/
Copy pathports.ts
File metadata and controls
128 lines (111 loc) · 3.53 KB
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
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import * as net from 'net';
/**
* @returns Returns a random port between 1025 and 65535.
*/
export function randomPort(): number {
const min = 1025;
const max = 65535;
return min + Math.floor((max - min) * Math.random());
}
/**
* Given a start point and a max number of retries, will find a port that
* is openable. Will return 0 in case no free port can be found.
*/
export function findFreePort(startPort: number, giveUpAfter: number, timeout: number): Promise<number> {
let done = false;
return new Promise(resolve => {
const timeoutHandle = setTimeout(() => {
if (!done) {
done = true;
return resolve(0);
}
}, timeout);
doFindFreePort(startPort, giveUpAfter, (port) => {
if (!done) {
done = true;
clearTimeout(timeoutHandle);
return resolve(port);
}
});
});
}
function doFindFreePort(startPort: number, giveUpAfter: number, clb: (port: number) => void): void {
if (giveUpAfter === 0) {
return clb(0);
}
const client = new net.Socket();
// If we can connect to the port it means the port is already taken so we continue searching
client.once('connect', () => {
dispose(client);
return doFindFreePort(startPort + 1, giveUpAfter - 1, clb);
});
client.once('data', () => {
// this listener is required since node.js 8.x
});
client.once('error', (err: Error & { code?: string }) => {
dispose(client);
// If we receive any non ECONNREFUSED error, it means the port is used but we cannot connect
if (err.code !== 'ECONNREFUSED') {
return doFindFreePort(startPort + 1, giveUpAfter - 1, clb);
}
// Otherwise it means the port is free to use!
return clb(startPort);
});
client.connect(startPort, '127.0.0.1');
}
/**
* Uses listen instead of connect. Is faster, but if there is another listener on 0.0.0.0 then this will take 127.0.0.1 from that listener.
*/
export function findFreePortFaster(startPort: number, giveUpAfter: number, timeout: number): Promise<number> {
let resolved: boolean = false;
let timeoutHandle: NodeJS.Timeout | undefined = undefined;
let countTried: number = 1;
const server = net.createServer({ pauseOnConnect: true });
function doResolve(port: number, resolve: (port: number) => void) {
if (!resolved) {
resolved = true;
server.removeAllListeners();
server.close();
if (timeoutHandle) {
clearTimeout(timeoutHandle);
}
resolve(port);
}
}
return new Promise<number>(resolve => {
timeoutHandle = setTimeout(() => {
doResolve(0, resolve);
}, timeout);
server.on('listening', () => {
doResolve(startPort, resolve);
});
server.on('error', err => {
if (err && ((<any>err).code === 'EADDRINUSE' || (<any>err).code === 'EACCES') && (countTried < giveUpAfter)) {
startPort++;
countTried++;
server.listen(startPort, '127.0.0.1');
} else {
doResolve(0, resolve);
}
});
server.on('close', () => {
doResolve(0, resolve);
});
server.listen(startPort, '127.0.0.1');
});
}
function dispose(socket: net.Socket): void {
try {
socket.removeAllListeners('connect');
socket.removeAllListeners('error');
socket.end();
socket.destroy();
socket.unref();
} catch (error) {
console.error(error); // otherwise this error would get lost in the callback chain
}
}