#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2020 Alibaba Group Holding Limited. All Rights Reserved.
#
# Licensed 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.
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import logging
from copy import deepcopy
from enum import Enum
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
from gremlin_python.process.anonymous_traversal import traversal
from graphscope.framework.dag import DAGNode
from graphscope.framework.dag_utils import fetch_gremlin_result
from graphscope.framework.dag_utils import gremlin_query
from graphscope.framework.dag_utils import gremlin_to_subgraph
logger = logging.getLogger("graphscope")
class InteractiveQueryStatus(Enum):
"""Enumeration class of current status of InteractiveQuery"""
Initializing = 0
Running = 1
Failed = 2
Closed = 3
class ResultSetDAGNode(DAGNode):
"""A class represents a result set node in a DAG.
This is a wrapper for :class:`gremlin_python.driver.resultset.ResultSet`,
and you can get the result by :method:`one()` or :method:`all()`.
"""
def __init__(self, interactive, op):
self._session = interactive.session
self._op = op
# add op to dag
self._session.dag.add_op(self._op)
def one(self):
"""See details in :method:`gremlin_python.driver.resultset.ResultSet.one`"""
# avoid circular import
from graphscope.framework.context import ResultDAGNode
op = fetch_gremlin_result(self, "one")
return ResultDAGNode(self, op)
def all(self):
"""See details in :method:`gremlin_python.driver.resultset.ResultSet.all`
Note that this method is equal to `ResultSet.all().result()`
"""
# avoid circular import
from graphscope.framework.context import ResultDAGNode
op = fetch_gremlin_result(self, "all")
return ResultDAGNode(self, op)
class ResultSet(object):
def __init__(self, result_set_node):
self._result_set_node = result_set_node
self._session = self._result_set_node.session
# copy and set op evaluated
self._result_set_node.op = deepcopy(self._result_set_node.op)
self._result_set_node.evaluated = True
self._session.dag.add_op(self._result_set_node.op)
def one(self):
return self._session._wrapper(self._result_set_node.one())
def all(self):
return self._session._wrapper(self._result_set_node.all())
[docs]class InteractiveQuery(object):
"""`InteractiveQuery` class, is a simple wrapper around
`Gremlin-Python <https://pypi.org/project/gremlinpython/>`_,
which implements Gremlin within the Python language.
It also can expose gremlin endpoint which can be used by
any other standard gremlin console, with the method `graph_url()`.
It also has a method called `subgraph` which can extract some fragments
from origin graph, produce a new, smaller but concise graph stored in vineyard,
which lifetime is independently of the origin graph.
User can either use `execute()` to submit a script, or use `traversal_source()`
to get a `GraphTraversalSource` for further traversal.
"""
[docs] def __init__(self, graph, frontend_endpoint):
"""Construct a :class:`InteractiveQuery` object."""
self._conn = None
# graph object id stored in vineyard
self._graph = graph
self._session = graph._session
frontend_endpoint = frontend_endpoint.split(",")
self._graph_url = [f"ws://{endpoint}/gremlin" for endpoint in frontend_endpoint]
self.closed = False
@property
def graph_url(self):
"""The gremlin graph url can be used with any standard gremlin console, e.g., tinkerpop."""
return self._graph_url
@property
def object_id(self):
return self._graph.vineyard_id
@property
def session(self):
return self._session
@property
def session_id(self):
return self._session.session_id
[docs] def execute(self, query, request_options=None):
"""Execute gremlin querying scripts.
Args:
query (str): Scripts that written in gremlin quering language.
request_options (dict, optional): Gremlin request options. format:
{
"engine": "gae"
}
Returns:
:class:`graphscope.framework.context.ResultDAGNode`:
A result holds the gremlin result, evaluated in eager mode.
"""
op = gremlin_query(self, query, request_options)
return self._session._wrapper(ResultSetDAGNode(self, op))
[docs] def submit(self, query, request_options=None):
return self.execute(query, request_options)
[docs] def subgraph(self, gremlin_script, request_options=None):
"""Create a subgraph, which input is the result of the execution of `gremlin_script`.
Any gremlin script that output a set of edges can be used to contruct a subgraph.
Args:
gremlin_script (str): Gremlin script to be executed.
request_options (dict, optional): Gremlin request options. format:
{
"engine": "gae"
}
Returns:
:class:`graphscope.framework.graph.GraphDAGNode`:
A new graph constructed by the gremlin output, that also stored in vineyard.
"""
# avoid circular import
from graphscope.framework.graph import GraphDAGNode
op = gremlin_to_subgraph(
self,
gremlin_script=gremlin_script,
request_options=request_options,
oid_type=self._graph._oid_type,
)
return self._session._wrapper(GraphDAGNode(self._session, op))
[docs] def traversal_source(self):
"""Create a GraphTraversalSource and return.
Once `g` has been created using a connection, we can start to write
Gremlin traversals to query the remote graph.
Raises:
RuntimeError: If the interactive script is not running.
Examples:
.. code:: python
sess = graphscope.session()
graph = load_modern_graph(sess, modern_graph_data_dir)
interactive = sess.gremlin(graph)
g = interactive.traversal_source()
print(g.V().both()[1:3].toList())
print(g.V().both().name.toList())
Returns:
`GraphTraversalSource`
"""
if self._conn is None:
self._conn = DriverRemoteConnection(self._graph_url[0], "g")
return traversal().withRemote(self._conn)
[docs] def close(self):
if self.closed or self._session.closed:
return
"""Close interactive instance and release resources"""
if self._conn is not None:
try:
self._conn.close()
except: # noqa: E722
pass
self._session._close_interactive_instance(self)
self.closed = True