emaui/node_modules/detect-port/dist/esm/detect-port.js

import { createServer } from 'node:net';
import { debuglog } from 'node:util';
import { ip } from 'address';
const debug = debuglog('detect-port');
export class IPAddressNotAvailableError extends Error {
    constructor(options) {
        super('The IP address is not available on this machine', options);
        this.name = this.constructor.name;
        Error.captureStackTrace(this, this.constructor);
    }
}
export function detectPort(port, callback) {
    let hostname = '';
    if (port && typeof port === 'object') {
        hostname = port.hostname;
        callback = port.callback;
        port = port.port;
    }
    else {
        if (typeof port === 'function') {
            callback = port;
            port = void 0;
        }
    }
    port = parseInt(port) || 0;
    let maxPort = port + 10;
    if (maxPort > 65535) {
        maxPort = 65535;
    }
    debug('detect free port between [%s, %s)', port, maxPort);
    if (typeof callback === 'function') {
        return tryListen(port, maxPort, hostname)
            .then(port => callback(null, port))
            .catch(callback);
    }
    // promise
    return tryListen(port, maxPort, hostname);
}
async function handleError(port, maxPort, hostname) {
    if (port >= maxPort) {
        debug('port: %s >= maxPort: %s, give up and use random port', port, maxPort);
        port = 0;
        maxPort = 0;
    }
    return await tryListen(port, maxPort, hostname);
}
async function tryListen(port, maxPort, hostname) {
    // use user hostname
    if (hostname) {
        try {
            return await listen(port, hostname);
        }
        catch (err) {
            if (err.code === 'EADDRNOTAVAIL') {
                throw new IPAddressNotAvailableError({ cause: err });
            }
            return await handleError(++port, maxPort, hostname);
        }
    }
    // 1. check null / undefined
    try {
        await listen(port);
    }
    catch (err) {
        // ignore random listening
        if (port === 0) {
            throw err;
        }
        return await handleError(++port, maxPort, hostname);
    }
    // 2. check 0.0.0.0
    try {
        await listen(port, '0.0.0.0');
    }
    catch (err) {
        return await handleError(++port, maxPort, hostname);
    }
    // 3. check 127.0.0.1
    try {
        await listen(port, '127.0.0.1');
    }
    catch (err) {
        return await handleError(++port, maxPort, hostname);
    }
    // 4. check localhost
    try {
        await listen(port, 'localhost');
    }
    catch (err) {
        // if localhost refer to the ip that is not unknown on the machine, you will see the error EADDRNOTAVAIL
        // https://stackoverflow.com/questions/10809740/listen-eaddrnotavail-error-in-node-js
        if (err.code !== 'EADDRNOTAVAIL') {
            return await handleError(++port, maxPort, hostname);
        }
    }
    // 5. check current ip
    try {
        return await listen(port, ip());
    }
    catch (err) {
        return await handleError(++port, maxPort, hostname);
    }
}
function listen(port, hostname) {
    const server = createServer();
    return new Promise((resolve, reject) => {
        server.once('error', err => {
            debug('listen %s:%s error: %s', hostname, port, err);
            server.close();
            if (err.code === 'ENOTFOUND') {
                debug('ignore dns ENOTFOUND error, get free %s:%s', hostname, port);
                return resolve(port);
            }
            return reject(err);
        });
        debug('try listen %d on %s', port, hostname);
        server.listen(port, hostname, () => {
            port = server.address().port;
            debug('get free %s:%s', hostname, port);
            server.close();
            return resolve(port);
        });
    });
}
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