def expand(G_in):
""" Expands out graph products. G is the source "backbone" graph. H_x is the "PoP template" graphs
"""
graph_unwrapped = ank_utils.unwrap_graph(G_in)
G = graph_unwrapped.copy()
ank.set_node_default(G_in, G_in)
template_names = set(node.pop_template for node in G_in)
template_names.discard("None")
template_names.discard(None)
if not len(template_names):
log.debug("No PoP templates set")
return # no templates set
# Load these templates
templates = {}
for template in template_names:
template_filename = os.path.join("pop_templates", "%s.graphml" % template)
try:
pop_graph = autonetkit.load.graphml.load_graphml(template_filename) #TODO: pass in properties eg edge type = physical
except Exception, e:
log.warning("Unable to load pop template %s: %s" % (template, e))
return
pop_graph = pop_graph.to_undirected() # Undirected for now TODO: document this
templates[template] = pop_graph
def expand(G_in):
""" Expands out graph products. G is the source "backbone" graph. H_x is the "PoP template" graphs
"""
graph_unwrapped = ank_utils.unwrap_graph(G_in)
G = graph_unwrapped.copy()
ank.set_node_default(G_in, G_in)
template_names = set(node.pop_template for node in G_in)
template_names.discard("None")
template_names.discard(None)
if not len(template_names):
log.debug("No PoP templates set")
return # no templates set
# Load these templates
templates = {}
for template in template_names:
template_filename = os.path.join("pop_templates",
"%s.graphml" % template)
try:
pop_graph = autonetkit.load.graphml.load_graphml(
template_filename
) #TODO: pass in properties eg edge type = physical
except Exception, e:
log.warning("Unable to load pop template %s: %s" % (template, e))
return
pop_graph = pop_graph.to_undirected(
) # Undirected for now TODO: document this
templates[template] = pop_graph
def expand(G_in):
""" Expands out graph products. G is the source "backbone" graph. H_x is the "PoP template" graphs
"""
graph_unwrapped = ank_utils.unwrap_graph(G_in)
G = graph_unwrapped.copy()
ank.set_node_default(G_in, G_in)
template_names = set(node.pop_template for node in G_in)
template_names.remove(None)
if not len(template_names):
return # no templates set
# Load these templates
templates = {}
for template in template_names:
print "TEMplate is", template
template_filename = os.path.join("pop_templates", "%s.graphml" % template)
pop_graph = ank.load_graphml(template_filename) #TODO: pass in properties eg edge type = physical
pop_graph = pop_graph.to_undirected() # Undirected for now TODO: document this
templates[template] = pop_graph
# construct new graph
G_out = nx.Graph() #TODO: what about bidirectional graphs?
G_out.add_nodes_from(expand_nodes(G, templates))
G_out.add_edges_from(intra_pop_links(G, templates))
G_out.add_edges_from(inter_pop_links(G, templates))
for s, t in G_out.edges():
G_out[s][t]['type'] = 'physical' # ensure copied across
# Update properties based on co-ordinates
for node in G_out:
u, v = node
template = G.node[u]['pop_template']
u_properties = dict(G.node[u])
v_properties = dict(templates[template].node[v]) # create copy to append with
x = float(u_properties.get('x')) + float(v_properties.get('x'))
y = float(u_properties.get('y')) + float(v_properties.get('y'))
asn = u_properties['asn']
u_properties.update(v_properties)
u_properties['x'] = x
u_properties['y'] = y
u_properties['label'] = "%s_%s" % (v, u)
u_properties['id'] = "%s_%s" % (v, u)
u_properties['pop'] = u
u_properties['asn'] = asn # restore, don't inherit from pop
del u_properties['pop_template']
G_out.node[node] = u_properties
nx.relabel_nodes(G_out, dict( ((u, v), "%s_%s" % (v, u)) for (u, v) in G_out), copy = False)
#TODO: set edge_ids
for s, t in G_out.edges():
G_out[s][t]['edge_id'] = "%s_%s" % (s, t)
G_in._replace_graph(G_out)
return
def igp_routes(anm, measured):
# TODO: split up expected calculation and comparison so don't need to calculate SPF multiple times
# TODO: allow choice of IGP - for now is just OSPF
import networkx as nx
g_ipv4 = anm['ipv4']
g_ospf = anm['ospf']
log.info("Verifying IGP routes")
# extract source node from measured data
try:
src_node = measured[0][0]
except IndexError:
log.info("Unable to parse measured results, returning")
return
# calculate expected routes
prefixes_by_router = {}
prefix_reachability = defaultdict(list)
for router in g_ospf:
ipv4_node = g_ipv4.node(router)
neighbors = ipv4_node.neighbors()
neighbor_subnets = [n.subnet for n in neighbors]
prefixes_by_router[router] = neighbor_subnets
for subnet in neighbor_subnets:
# use strings for faster matching from here on
# (can convert back to overlay_nodes later)
prefix_reachability[str(subnet)].append(str(router))
# print prefixes_by_router
# print prefix_reachability
graph = unwrap_graph(g_ospf)
shortest_paths = nx.shortest_path(graph, source=src_node, weight='cost')
shortest_path_lengths = nx.shortest_path_length(
graph, source=src_node, weight='cost')
# pprint.pprint(shortest_path_lengths)
optimal_prefixes = {}
for prefix, routers in prefix_reachability.items():
# decorate with cost
try:
routers_with_costs = [
(shortest_path_lengths[r], r) for r in routers]
except KeyError:
continue # no router, likely from eBGP
min_cost = min(rwc[0] for rwc in routers_with_costs)
shortest_routers = [rwc[1]
for rwc in routers_with_costs if rwc[0] == min_cost]
optimal_prefixes[str(prefix)] = shortest_routers
# print optimal_prefixes
verified_prefixes = {}
for route in measured:
dst_cd = route[-1]
prefix = str(g_ipv4.node(dst_cd).subnet)
try:
optimal_routers = optimal_prefixes[prefix]
except KeyError:
continue # prefix not present
if src_node in optimal_routers:
continue # target is self
optimal_routes = [shortest_paths[r] for r in optimal_routers]
optimal_next_hop = [p[1] for p in optimal_routes]
actual_next_hop = route[1]
log.info("Match: %s, %s, optimal: %s, actual: %s" % (
actual_next_hop in optimal_next_hop, prefix, ", ".join(optimal_next_hop), actual_next_hop))
if actual_next_hop not in optimal_next_hop:
log.info("Unverified prefix: %s on %s. Expected: %s. Received: %s" % (prefix, dst_cd,
", ".join(optimal_next_hop), actual_next_hop))
verified_prefixes[prefix] = actual_next_hop in optimal_next_hop
verified_count = verified_prefixes.values().count(True)
try:
verified_fraction = round(
100 * verified_count / len(verified_prefixes), 2)
except ZeroDivisionError:
verified_fraction = 0
log.info("%s%% verification rate" % verified_fraction)
return verified_prefixes
def igp_routes(anm, measured):
#TODO: split up expected calculation and comparison so don't need to calculate SPF multiple times
#TODO: allow choice of IGP - for now is just OSPF
import networkx as nx
g_ipv4 = anm['ipv4']
g_ospf = anm['ospf']
log.info("Verifying IGP routes")
# extract source node from measured data
try:
src_node = measured[0][0]
except IndexError:
log.info("Unable to parse measured results, returning")
return
# calculate expected routes
prefixes_by_router = {}
prefix_reachability = defaultdict(list)
for router in g_ospf:
ipv4_node = g_ipv4.node(router)
neighbors = ipv4_node.neighbors()
neighbor_subnets = [n.subnet for n in neighbors]
prefixes_by_router[router] = neighbor_subnets
for subnet in neighbor_subnets:
# use strings for faster matching from here on
# (can convert back to overlay_nodes later)
prefix_reachability[str(subnet)].append(str(router))
#print prefixes_by_router
#print prefix_reachability
graph = unwrap_graph(g_ospf)
shortest_paths = nx.shortest_path(graph, source = src_node, weight = 'cost')
shortest_path_lengths = nx.shortest_path_length(graph, source = src_node, weight = 'cost')
#pprint.pprint(shortest_path_lengths)
optimal_prefixes = {}
for prefix, routers in prefix_reachability.items():
# decorate with cost
routers_with_costs = [(shortest_path_lengths[r], r) for r in routers]
min_cost = min(rwc[0] for rwc in routers_with_costs)
shortest_routers = [rwc[1] for rwc in routers_with_costs if rwc[0] == min_cost]
optimal_prefixes[str(prefix)] = shortest_routers
#print optimal_prefixes
verified_prefixes = {}
for route in measured:
dst_cd = route[-1]
prefix = str(g_ipv4.node(dst_cd).subnet)
optimal_routers = optimal_prefixes[prefix]
if src_node in optimal_routers:
continue # target is self
optimal_routes = [shortest_paths[r] for r in optimal_routers]
optimal_next_hop = [p[1] for p in optimal_routes]
actual_next_hop = route[1]
log.debug( "Match: %s, %s, optimal: %s, actual: %s" % (
actual_next_hop in optimal_next_hop, prefix, ", ".join(optimal_next_hop), actual_next_hop))
if actual_next_hop not in optimal_next_hop:
log.info("Unverified prefix: %s on %s. Expected: %s. Received: %s" % (prefix, dst_cd,
", ".join(optimal_next_hop), actual_next_hop))
verified_prefixes[prefix] = actual_next_hop in optimal_next_hop
verified_count = verified_prefixes.values().count(True)
verified_fraction = round(100 * verified_count/len(verified_prefixes),2)
log.info("%s%% verification rate" % verified_fraction)
return verified_prefixes
