netlify/dist/lib/wait-port.js

Netlify command line tool

import net from 'net';
export const waitPort = async (port, host, timeout, maxRetries) => {
    const startTime = Date.now();
    const retries = maxRetries ?? Math.ceil(timeout / 2000);
    for (let attempt = 0; attempt < retries; attempt++) {
        if (Date.now() - startTime > timeout) {
            return { open: false };
        }
        try {
            const ipVersion = await new Promise((resolve, reject) => {
                const socket = new net.Socket();
                let isResolved = false;
                socket.on('connect', () => {
                    isResolved = true;
                    // Detect actual IP version from the connection
                    const detectedVersion = socket.remoteFamily === 'IPv6' ? 6 : 4;
                    socket.end();
                    resolve(detectedVersion);
                });
                socket.on('error', (error) => {
                    if (!isResolved) {
                        isResolved = true;
                        socket.destroy();
                        reject(error);
                    }
                });
                socket.setTimeout(1000, () => {
                    if (!isResolved) {
                        isResolved = true;
                        socket.destroy();
                        reject(new Error('Socket timeout'));
                    }
                });
                socket.connect(port, host);
            });
            return { open: true, ipVersion };
        }
        catch {
            await new Promise((resolve) => setTimeout(resolve, Math.min(100 * (attempt + 1), 1000)));
            continue;
        }
    }
    return { open: false };
};
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