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"""Client for the Tinkerpop 3 Gremlin Server.""" |
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from aiogremlin import exception |
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from gremlin_python.driver import request |
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from gremlin_python.process import traversal |
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class Client: |
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""" |
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Client that utilizes a :py:class:`Cluster<aiogremlin.driver.cluster.Cluster>` |
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to access a cluster of Gremlin Server hosts. Issues requests to hosts using |
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a round robin strategy. |
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:param aiogremlin.driver.cluster.Cluster cluster: Cluster used by |
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client |
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:param asyncio.BaseEventLoop loop: |
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:param dict aliases: Optional mapping for aliases. Default is `None` |
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""" |
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def __init__(self, cluster, loop, *, hostname=None, aliases=None): |
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self._cluster = cluster |
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self._loop = loop |
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if aliases is None: |
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aliases = {} |
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self._hostname = hostname |
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self._aliases = aliases |
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@property |
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def aliases(self): |
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"""Read-only property""" |
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return self._aliases |
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@property |
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def message_serializer(self): |
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"""Read-only property""" |
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return self.cluster.config['message_serializer'] |
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@property |
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def cluster(self): |
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""" |
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Read-only property. |
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:returns: The instance of |
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:py:class:`Cluster<aiogremlin.driver.cluster.Cluster>` associated with |
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client. |
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""" |
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return self._cluster |
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async def close(self): |
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await self._cluster.close() |
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def alias(self, aliases): |
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client = Client(self._cluster, self._loop, |
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aliases=aliases) |
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return client |
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async def submit(self, message, bindings=None): |
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""" |
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**coroutine** Submit a script and bindings to the Gremlin Server. |
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:param message: Can be an instance of |
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`RequestMessage<gremlin_python.driver.request.RequestMessage>` or |
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`Bytecode<gremlin_python.process.traversal.Bytecode>` |
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or a `str` representing a raw Gremlin script |
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:param dict bindings: Optional bindings used with raw Grelmin |
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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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if isinstance(message, traversal.Bytecode): |
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message = request.RequestMessage( |
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processor='traversal', op='bytecode', |
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args={'gremlin': message, |
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'aliases': self._aliases}) |
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elif isinstance(message, str): |
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message = request.RequestMessage( |
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processor='', op='eval', |
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args={'gremlin': message, |
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'aliases': self._aliases}) |
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if bindings: |
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message.args.update({'bindings': bindings}) |
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conn = await self.cluster.get_connection(hostname=self._hostname) |
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resp = await conn.write(message) |
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self._loop.create_task(conn.release_task(resp)) |
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return resp |
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goblin-ogm /
aiogremlin
