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99 lines
3.5 KiB
Python
99 lines
3.5 KiB
Python
import pydot
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from rest_framework import generics
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from rest_framework.views import APIView
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import tempfile
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from wsgiref.util import FileWrapper
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from django.db.models import Q
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from django.http import Http404, HttpResponse
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from django.shortcuts import get_object_or_404
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from circuits.models import Provider
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from dcim.models import Site, Device, Interface, InterfaceConnection
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from extras.models import Graph, TopologyMap, GRAPH_TYPE_INTERFACE, GRAPH_TYPE_PROVIDER, GRAPH_TYPE_SITE
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from .serializers import GraphSerializer
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class GraphListView(generics.ListAPIView):
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"""
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Returns a list of relevant graphs
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"""
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serializer_class = GraphSerializer
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def get_serializer_context(self):
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cls = {
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GRAPH_TYPE_INTERFACE: Interface,
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GRAPH_TYPE_PROVIDER: Provider,
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GRAPH_TYPE_SITE: Site,
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}
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context = super(GraphListView, self).get_serializer_context()
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context.update({'graphed_object': get_object_or_404(cls[self.kwargs.get('type')], pk=self.kwargs['pk'])})
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return context
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def get_queryset(self):
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graph_type = self.kwargs.get('type', None)
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if not graph_type:
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raise Http404()
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queryset = Graph.objects.filter(type=graph_type)
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return queryset
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class TopologyMapView(APIView):
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"""
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Generate a topology diagram
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"""
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def get(self, request, slug):
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tmap = get_object_or_404(TopologyMap, slug=slug)
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# Construct the graph
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graph = pydot.Dot(graph_type='graph', ranksep='1')
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for i, device_set in enumerate(tmap.device_sets):
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subgraph = pydot.Subgraph('sg{}'.format(i), rank='same')
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# Add a pseudonode for each device_set to enforce hierarchical layout
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subgraph.add_node(pydot.Node('set{}'.format(i), shape='none', width='0', label=''))
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if i:
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graph.add_edge(pydot.Edge('set{}'.format(i - 1), 'set{}'.format(i), style='invis'))
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# Add each device to the graph
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devices = []
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for query in device_set.split(','):
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devices += Device.objects.filter(name__regex=query)
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for d in devices:
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node = pydot.Node(d.name)
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subgraph.add_node(node)
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# Add an invisible connection to each successive device in a set to enforce horizontal order
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for j in range(0, len(devices) - 1):
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edge = pydot.Edge(devices[j].name, devices[j + 1].name)
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# edge.set('style', 'invis') doesn't seem to work for some reason
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edge.set_style('invis')
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subgraph.add_edge(edge)
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graph.add_subgraph(subgraph)
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# Compile list of all devices
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device_superset = Q()
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for device_set in tmap.device_sets:
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for query in device_set.split(','):
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device_superset = device_superset | Q(name__regex=query)
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# Add all connections to the graph
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devices = Device.objects.filter(*(device_superset,))
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connections = InterfaceConnection.objects.filter(interface_a__device__in=devices, interface_b__device__in=devices)
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for c in connections:
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edge = pydot.Edge(c.interface_a.device.name, c.interface_b.device.name)
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graph.add_edge(edge)
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# Write the image to disk and return
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topo_file = tempfile.NamedTemporaryFile()
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graph.write(topo_file.name, format='png')
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response = HttpResponse(FileWrapper(topo_file), content_type='image/png')
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topo_file.close()
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return response
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