af-consul/dist/esm/src/lib/fqdn.js

A highly specialized function library

import * as os from 'os';
import * as dns from 'dns';
import { minimizeCache } from './utils';
// Returns fully qualified domain name
export const getFQDN = (h, withError, onlyDomain) => {
    h = h || os.hostname();
    return new Promise((resolve, reject) => {
        dns.lookup(h, { hints: dns.ADDRCONFIG }, (err, ip) => {
            if (err) {
                return withError ? reject(err) : resolve(null);
            }
            dns.lookupService(ip, 0, (err2, hostname) => {
                if (err2) {
                    return withError ? reject(err2) : resolve(null);
                }
                if (onlyDomain && !/\.[a-z]+$/i.test(hostname)) {
                    resolve(null);
                    return;
                }
                resolve(hostname);
            });
        });
    });
};
const fqdnCache = {};
export const getFQDNCached = async (...args) => {
    var _a;
    const hostNameOrIP = args[0] || os.hostname() || '-';
    minimizeCache(fqdnCache, 10);
    if (!fqdnCache[hostNameOrIP]) {
        const fqdn = await getFQDN(...args);
        if (fqdn) {
            fqdnCache[hostNameOrIP] = {
                created: Date.now(),
                value: fqdn,
            };
        }
    }
    return ((_a = fqdnCache[hostNameOrIP]) === null || _a === void 0 ? void 0 : _a.value) || null;
};
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