| # |
| # 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 |
| from gremlin_python.driver.resultset import ResultSet |
| |
| __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"] |
| self.status_code = status["code"] |
| |
| @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({'code': 500, |
| 'message': 'Server disconnected - please try to reconnect', 'attributes': {}}) |
| |
| message = self._message_serializer.deserialize_message(message) |
| request_id = message['requestId'] |
| result_set = results_dict[request_id] if request_id in results_dict else ResultSet(None, None) |
| 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 |
| return 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"]) |