text: """
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at
  
  http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an
  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
  under the License.
  """
  import abc
  import base64
  
  import six
  try:
      import ujson as json
  except ImportError:
      import json
  
  from gremlin_python.driver import serializer, request
  
  __author__ = 'David M. Brown (davebshow@gmail.com)'
  
  
  class GremlinServerError(Exception):
      def __init__(self, status):
          super(GremlinServerError, self).__init__("{0}: {1}".format(status["code"], status["message"]))
          self._status_attributes = status["attributes"]
  
      @property
      def status_attributes(self):
          return self._status_attributes        
  
  
  @six.add_metaclass(abc.ABCMeta)
  class AbstractBaseProtocol:
  
      @abc.abstractmethod
      def connection_made(self, transport):
          self._transport = transport
  
      @abc.abstractmethod
      def data_received(self, message):
          pass
  
      @abc.abstractmethod
      def write(self, request_id, request_message):
          pass
  
  
  class GremlinServerWSProtocol(AbstractBaseProtocol):
  
      def __init__(self, message_serializer, username='', password=''):
          self._message_serializer = message_serializer
          self._username = username
          self._password = password
  
      def connection_made(self, transport):
          super(GremlinServerWSProtocol, self).connection_made(transport)
  
      def write(self, request_id, request_message):
          message = self._message_serializer.serialize_message(
              request_id, request_message)
          self._transport.write(message)
  
      def data_received(self, message, results_dict):
          # if Gremlin Server cuts off then we get a None for the message
          if message is None:
              raise GremlinServerError("Server disconnected - please try to reconnect")
  
          message = self._message_serializer.deserialize_message(json.loads(message.decode('utf-8')))
          request_id = message['requestId']
          result_set = results_dict[request_id]
          status_code = message['status']['code']
          aggregate_to = message['result']['meta'].get('aggregateTo', 'list')
          data = message['result']['data']
          result_set.aggregate_to = aggregate_to
          if status_code == 407:
              auth = b''.join([b'\x00', self._username.encode('utf-8'),
                               b'\x00', self._password.encode('utf-8')])
              request_message = request.RequestMessage(
                  'traversal', 'authentication',
                  {'sasl': base64.b64encode(auth).decode()})
              self.write(request_id, request_message)
              data = self._transport.read()
              # Allow recursive call for auth
              self.data_received(data, results_dict)
          elif status_code == 204:
              result_set.stream.put_nowait([])
              del results_dict[request_id]
              return status_code
          elif status_code in [200, 206]:
              result_set.stream.put_nowait(data)
              if status_code == 200:
                  result_set.status_attributes = message['status']['attributes']
                  del results_dict[request_id]
              return status_code
          else:
              del results_dict[request_id]
              raise GremlinServerError(message["status"])
  