Source code for thoth.lab.graph
#!/usr/bin/env python3
# thoth-lab
# Copyright(C) 2018, 2019, 2020 Fridolin Pokorny
#
# This program is free software: you can redistribute it and / or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Various helpers and utils for interaction with the graph database."""
import asyncio
import typing
import networkx as nx
import pandas as pd
from collections import OrderedDict
import plotly.graph_objs as go
from plotly.offline import init_notebook_mode, iplot
[docs]class DependencyGraph(nx.OrderedDiGraph):
"""Construct a dependency graph by extending nx.OrderedDiGraph."""
node_dict_factory = OrderedDict
adjlist_dict_factory = OrderedDict
[docs] @staticmethod
def get_root(tree):
"""Return root of the current graph, if any.
By default, tree topology is considered as input,
so if there are multiple roots, only the first one is returned.
"""
root = None
for node, d in tree.in_degree():
root = node
break
return root
get_root = DependencyGraph.get_root
get_root.__doc__ = DependencyGraph.get_root.__doc__
[docs]class GraphQueryResult(object):
"""Wrap results of graph database queries."""
def __init__(self, result):
"""Initialize.
:param result: the result to be used as a query result, can be directly coroutine that is fired.
"""
if isinstance(result, typing.Coroutine):
loop = asyncio.get_event_loop()
result = loop.run_until_complete(result)
self.result = result
def _get_items(self):
"""Get items from the result."""
items = list(self.result.items())
labels = [item[0] for item in items]
values = [item[1] for item in items]
return labels, values
[docs] def to_dataframe(self):
"""Construct a panda's dataframe on results."""
return pd.DataFrame(data=self.result)
[docs] def plot_pie(self):
"""Plot a pie of results into Jupyter notebook."""
init_notebook_mode(connected=True)
labels, values = self._get_items()
trace = go.Pie(labels=labels, values=values)
return iplot([trace])
[docs] def plot_bar(self):
"""Plot histogram of results obtained."""
init_notebook_mode(connected=True)
labels, values = self._get_items()
trace = go.Bar(x=labels, y=values)
return iplot([trace])
[docs] def serialize(self):
"""Serialize the output of graph query."""
# It should be fine to just use one check for nested parts. We can extend this later on.
def _serialize(obj):
if hasattr(obj, "to_dict"):
return obj.to_dict()
return obj
if isinstance(self.result, list):
return list(map(lambda x: _serialize(x), self.result))
return _serialize(self.result)