code: func (fs *FileAddrStorage) GetAddresses() ([]NetAddr, error) {
  	bytes, err := ioutil.ReadFile(fs.filePath)
  	if err != nil {
  		return nil, trace.ConvertSystemError(err)
  	}
  	var addrs []NetAddr
  	if len(bytes) > 0 {
  		err = json.Unmarshal(bytes, &addrs)
  		if err != nil {
  			return nil, trace.Wrap(err)
  		}
  	}
  	return addrs, nil
  }
docs: // GetAddresses returns saved address list