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https://github.com/CumulusNetworks/ifupdown2.git
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96 lines
2.6 KiB
Python
96 lines
2.6 KiB
Python
#!/usr/bin/env python3
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#
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# Copyright 2014-2017 Cumulus Networks, Inc. All rights reserved.
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# Author: Roopa Prabhu, roopa@cumulusnetworks.com
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#
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# graph --
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# graph helper module for ifupdown
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#
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import copy
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import logging
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from collections import deque
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try:
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from gvgen import *
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except ImportError as e:
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pass
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class graph():
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""" graph functions to sort and print interface graph """
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logger = logging.getLogger('ifupdown.graph')
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@classmethod
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def topological_sort_graphs_all(cls, dependency_graphs, indegrees_arg):
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""" runs topological sort on interface list passed as dependency graph
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Args:
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**dependency_graphs** (dict): dependency graph with dependency
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lists for interfaces
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**indegrees_arg** (dict): indegrees array for all interfaces
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"""
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S = []
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Q = deque()
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indegrees = copy.deepcopy(indegrees_arg)
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for ifname,indegree in list(indegrees.items()):
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if indegree == 0:
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Q.append(ifname)
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while len(Q):
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# initialize queue
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x = Q.popleft()
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# Get dependents of x
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dlist = dependency_graphs.get(x)
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if not dlist:
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S.append(x)
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continue
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for y in dlist:
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try:
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indegrees[y] = indegrees.get(y) - 1
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except:
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cls.logger.debug('topological_sort_graphs_all: did not find %s' %y)
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indegrees[y] = 0
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pass
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if indegrees.get(y) == 0:
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Q.append(y)
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S.append(x)
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for ifname,indegree in list(indegrees.items()):
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if indegree != 0:
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raise Exception('cycle found involving iface %s' %ifname +
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' (indegree %d)' %indegree)
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return S
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@classmethod
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def generate_dots(cls, dependency_graph, indegrees):
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""" spits out interface dependency graph in dot format
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Args:
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**dependency_graphs** (dict): dependency graph with dependency
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lists for interfaces
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**indegrees_arg** (dict): indegrees array for all interfaces
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"""
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gvgraph = GvGen()
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graphnodes = {}
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for v in list(dependency_graph.keys()):
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graphnodes[v] = gvgraph.newItem(v)
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for i, v in list(graphnodes.items()):
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dlist = dependency_graph.get(i, [])
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if not dlist:
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continue
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for d in dlist:
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gvgraph.newLink(v, graphnodes.get(d))
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gvgraph.dot()
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