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import asyncio |
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import logging |
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import uuid |
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try: |
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import ujson as json |
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except ImportError: |
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import json |
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from aiogremlin.driver import provider, resultset |
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from aiogremlin.driver.protocol import GremlinServerWSProtocol |
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from aiogremlin.driver.aiohttp.transport import AiohttpTransport |
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from gremlin_python.driver import serializer |
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logger = logging.getLogger(__name__) |
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class Connection: |
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""" |
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Main classd for interacting with the Gremlin Server. Encapsulates a |
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websocket connection. Not instantiated directly. Instead use |
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:py:meth::`Connection.open<aiogremlin.driver.connection.Connection.open>`. |
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:param str url: url for host Gremlin Server |
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:param gremlin_python.driver.transport.AbstractBaseTransport transport: |
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Transport implementation |
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:param gremlin_python.driver.protocol.AbstractBaseProtocol protocol: |
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Protocol implementation |
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:param asyncio.BaseEventLoop loop: |
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:param str username: Username for database auth |
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:param str password: Password for database auth |
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:param int max_inflight: Maximum number of unprocessed requests at any |
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one time on the connection |
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:param float response_timeout: (optional) `None` by default |
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""" |
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def __init__(self, url, transport, protocol, loop, username, password, |
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max_inflight, response_timeout, message_serializer, provider): |
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self._url = url |
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self._transport = transport |
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self._protocol = protocol |
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self._loop = loop |
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self._response_timeout = response_timeout |
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self._username = username |
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self._password = password |
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self._closed = False |
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self._result_sets = {} |
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self._receive_task = self._loop.create_task(self._receive()) |
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self._semaphore = asyncio.Semaphore(value=max_inflight, |
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loop=self._loop) |
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if isinstance(message_serializer, type): |
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message_serializer = message_serializer() |
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self._message_serializer = message_serializer |
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self._provider = provider |
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@classmethod |
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async def open(cls, url, loop, *, |
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protocol=None, |
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transport_factory=None, |
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ssl_context=None, |
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username='', |
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password='', |
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max_inflight=64, |
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response_timeout=None, |
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message_serializer=serializer.GraphSONMessageSerializer, |
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provider=provider.TinkerGraph): |
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""" |
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**coroutine** Open a connection to the Gremlin Server. |
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:param str url: url for host Gremlin Server |
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:param asyncio.BaseEventLoop loop: |
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:param gremlin_python.driver.protocol.AbstractBaseProtocol protocol: |
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Protocol implementation |
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:param transport_factory: Factory function for transports |
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:param ssl.SSLContext ssl_context: |
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:param str username: Username for database auth |
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:param str password: Password for database auth |
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:param int max_inflight: Maximum number of unprocessed requests at any |
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one time on the connection |
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:param float response_timeout: (optional) `None` by default |
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:param message_serializer: Message serializer implementation |
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:param provider: Graph provider object implementation |
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:returns: :py:class:`Connection<aiogremlin.driver.connection.Connection>` |
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""" |
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if not protocol: |
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protocol = GremlinServerWSProtocol(message_serializer) |
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if not transport_factory: |
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transport_factory = lambda: AiohttpTransport(loop) |
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transport = transport_factory() |
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await transport.connect(url, ssl_context=ssl_context) |
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return cls(url, transport, protocol, loop, username, password, |
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max_inflight, response_timeout, message_serializer, |
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provider) |
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@property |
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def message_serializer(self): |
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return self._message_serializer |
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@property |
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def closed(self): |
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""" |
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Read-only property. Check if connection has been closed. |
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:returns: `bool` |
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""" |
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return self._closed or self._transport.closed |
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@property |
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def url(self): |
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""" |
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Readonly property. |
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:returns: str The url association with this connection. |
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""" |
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return self._url |
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async def write(self, message): |
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""" |
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Submit a script and bindings to the Gremlin Server |
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:param `RequestMessage<gremlin_python.driver.request.RequestMessage>` message: |
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:returns: :py:class:`ResultSet<aiogremlin.driver.resultset.ResultSet>` |
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object |
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""" |
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await self._semaphore.acquire() |
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request_id = str(uuid.uuid4()) |
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message = self._message_serializer.serialize_message( |
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request_id, message) |
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if self._transport.closed: |
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await self._transport.connect(self.url) |
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func = self._transport.write(message) |
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if asyncio.iscoroutine(func): |
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await func |
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result_set = resultset.ResultSet(request_id, self._response_timeout, |
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self._loop) |
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self._result_sets[request_id] = result_set |
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self._loop.create_task( |
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self._terminate_response(result_set, request_id)) |
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return result_set |
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submit = write |
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async def close(self): |
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"""**coroutine** Close underlying connection and mark as closed.""" |
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self._receive_task.cancel() |
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await self._transport.close() |
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self._closed = True |
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async def _terminate_response(self, resp, request_id): |
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await resp.done.wait() |
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del self._result_sets[request_id] |
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self._semaphore.release() |
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async def _receive(self): |
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while True: |
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data = await self._transport.read() |
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await self._protocol.data_received(data, self._result_sets) |
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async def __aenter__(self): |
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return self |
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async def __aexit__(self, exc_type, exc, tb): |
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await self.close() |
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self._transport = None |
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goblin-ogm /
aiogremlin
