| # 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 queue |
| from concurrent.futures import Future |
| |
| from gremlin_python.driver import resultset, useragent |
| |
| __author__ = 'David M. Brown (davebshow@gmail.com)' |
| |
| |
| class Connection: |
| |
| def __init__(self, url, traversal_source, protocol, transport_factory, |
| executor, pool, headers=None, enable_user_agent_on_connect=True, |
| bulk_results=False): |
| self._url = url |
| self._headers = headers |
| self._traversal_source = traversal_source |
| self._protocol = protocol |
| self._transport_factory = transport_factory |
| self._executor = executor |
| self._transport = None |
| self._pool = pool |
| self._result_set = None |
| self._inited = False |
| self._enable_user_agent_on_connect = enable_user_agent_on_connect |
| if self._enable_user_agent_on_connect: |
| self.__add_header(useragent.userAgentHeader, useragent.userAgent) |
| self._bulk_results = bulk_results |
| if self._bulk_results: |
| self.__add_header("bulkResults", "true") |
| |
| def connect(self): |
| if self._transport: |
| self._transport.close() |
| self._transport = self._transport_factory() |
| self._transport.connect(self._url, self._headers) |
| self._protocol.connection_made(self._transport) |
| self._inited = True |
| |
| def close(self): |
| if self._inited: |
| self._transport.close() |
| |
| def write(self, request_message): |
| if not self._inited: |
| self.connect() |
| self._result_set = resultset.ResultSet(queue.Queue()) |
| # Create write task |
| future = Future() |
| future_write = self._executor.submit( |
| self._protocol.write, request_message) |
| |
| def cb(f): |
| try: |
| f.result() |
| except Exception as e: |
| future.set_exception(e) |
| self._pool.put_nowait(self) |
| else: |
| # Start receive task |
| done = self._executor.submit(self._receive) |
| self._result_set.done = done |
| future.set_result(self._result_set) |
| |
| future_write.add_done_callback(cb) |
| return future |
| |
| def _receive(self): |
| try: |
| ''' |
| GraphSON does not support streaming deserialization, we are aggregating data and bypassing streamed |
| deserialization while GraphSON is enabled for testing. Remove after GraphSON is removed. |
| ''' |
| self._protocol.data_received_aggregate(self._transport.read(), self._result_set) |
| # re-enable streaming after graphSON removal |
| # self._transport.read(self.stream_chunk) |
| finally: |
| self._pool.put_nowait(self) |
| |
| def stream_chunk(self, chunk_data, read_completed=None, http_req_resp=None): |
| self._protocol.data_received(chunk_data, self._result_set, read_completed, http_req_resp) |
| |
| def __add_header(self, key, value): |
| if self._headers is None: |
| self._headers = dict() |
| # Headers may be a list of pairs |
| if isinstance(self._headers, list): |
| for pair in self._headers: |
| if pair[0] == key: |
| self._headers.remove(pair) |
| self._headers.append((key, value)) |
| else: |
| self._headers[key] = value |
