Method refresh

lib/utils.js:605–624

* Tries to resolve the addresses for the host name.

()

   * Tries to resolve the addresses for the host name.
   */
  async refresh() {
    if (this._isIp) {
      return;
    }

    if (this._refreshing) {
      return await promiseUtils.fromEvent(this._refreshing, 'finished');
    }

    this._refreshing = new EventEmitter().setMaxListeners(0);

    try {
      await this._resolve();
    } catch (err) {
      // Ignore the possible resolution error
    }

    this._refreshing.emit('finished');
    this._refreshing = null;
  }

  async _resolve() {
    const arr = await this._resolve4(this._nameOrIp);