Function query

lib/internal/dns/callback_resolver.js:55–84

(name, /* options, */ callback)

function resolver(bindingName) {
  function query(name, /* options, */ callback) {
    let options;
    if (arguments.length > 2) {
      options = callback;
      callback = arguments[2];
    }

    validateString(name, 'name');
    validateFunction(callback, 'callback');

    const req = new QueryReqWrap();
    req.bindingName = bindingName;
    req.callback = callback;
    req.hostname = name;
    req.oncomplete = onresolve;
    req.ttl = !!(options?.ttl);
    const err = this._handle[bindingName](req, name);
    if (err) throw new DNSException(err, bindingName, name);
    if (hasObserver('dns')) {
      startPerf(req, kPerfHooksDnsLookupResolveContext, {
        type: 'dns',
        name: bindingName,
        detail: {
          host: name,
          ttl: req.ttl,
        },
      });
    }
    return req;
  }
  ObjectDefineProperty(query, 'name', { __proto__: null, value: bindingName });
  return query;
}