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port.ts
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port.ts
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/**********************************************************************
* Copyright (C) 2022 Red Hat, Inc.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
***********************************************************************/
import * as net from 'net';
/**
* Find a free port starting from the given port
*/
export function getFreePort(port = 0): Promise<number> {
if (port < 1024) {
port = 9000;
}
const server = net.createServer();
return new Promise((resolve, reject) =>
server
.on('error', (error: NodeJS.ErrnoException) =>
error.code === 'EADDRINUSE' ? server.listen(++port) : reject(error),
)
.on('listening', () => server.close(() => resolve(port)))
.listen(port),
);
}
/**
* Find a free port range
*/
export async function getFreePortRange(rangeSize: number): Promise<string> {
let port = 9000;
let startPort = port;
do {
if (await isFreePort(port)) {
++port;
} else {
++port;
startPort = port;
}
} while (port + 1 - startPort <= rangeSize);
return `${startPort}-${port - 1}`;
}
export function isFreePort(port: number): Promise<boolean> {
const server = net.createServer();
return new Promise((resolve, reject) =>
server
.on('error', (error: NodeJS.ErrnoException) => (error.code === 'EADDRINUSE' ? resolve(false) : reject(error)))
.on('listening', () => server.close(() => resolve(true)))
.listen(port),
);
}