| # 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 uuid |
| from concurrent.futures import Future |
| from six.moves import queue |
| |
| from gremlin_python.driver import resultset |
| |
| __author__ = 'David M. Brown (davebshow@gmail.com)' |
| |
| |
| class Connection: |
| |
| def __init__(self, url, traversal_source, protocol, transport_factory, |
| executor, pool, headers=None): |
| 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._results = {} |
| self._inited = False |
| |
| 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() |
| request_id = str(uuid.uuid4()) |
| result_set = resultset.ResultSet(queue.Queue(), request_id) |
| self._results[request_id] = result_set |
| # Create write task |
| future = Future() |
| future_write = self._executor.submit( |
| self._protocol.write, request_id, 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) |
| result_set.done = done |
| future.set_result(result_set) |
| |
| future_write.add_done_callback(cb) |
| return future |
| |
| def _receive(self): |
| try: |
| while True: |
| data = self._transport.read() |
| status_code = self._protocol.data_received(data, self._results) |
| if status_code != 206: |
| break |
| finally: |
| self._pool.put_nowait(self) |
