Function lookupService

lib/dns.js:268–301

(address, port, callback)

function lookupService(address, port, callback) {
  if (arguments.length !== 3)
    throw new ERR_MISSING_ARGS('address', 'port', 'callback');

  if (isIP(address) === 0)
    throw new ERR_INVALID_ARG_VALUE('address', address);

  validatePort(port);

  validateFunction(callback, 'callback');

  // Coerce -0 to +0.
  port = +port + 0;

  const req = new GetNameInfoReqWrap();
  req.callback = callback;
  req.hostname = address;
  req.port = port;
  req.oncomplete = onlookupservice;

  const err = cares.getnameinfo(req, address, port);
  if (err) throw new DNSException(err, 'getnameinfo', address);
  if (hasObserver('dns')) {
    startPerf(req, kPerfHooksDnsLookupServiceContext, {
      type: 'dns',
      name: 'lookupService',
      detail: {
        host: address,
        port,
      },
    });
  }
  return req;
}

ObjectDefineProperty(lookupService, customPromisifyArgs,
                     { __proto__: null, value: ['hostname', 'service'], enumerable: false });