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#!/usr/bin/python
# -*- coding: utf8 -*-
import sys,json
supernodes= [ "kaah","supernode","euer","pa_sharepoint","oxberg" ]
""" TODO: Refactoring needed to pull the edges out of the node structures again,
it should be easier to handle both structures"""
DUMP_FILE = "/krebs/db/availability"
def write_digraph(nodes):
"""
writes the complete digraph in dot format
"""
print ('digraph retiolum {')
#print (' graph [center rankdir=LR packMode="clust"]')
print (' graph [center packMode="clust"]')
print (' node[shape=box,style=filled,fillcolor=grey]')
print (' overlap=false')
generate_stats(nodes)
merge_edges(nodes)
write_stat_node(nodes)
for k,v in nodes.iteritems():
write_node(k,v)
print ('}')
def dump_graph(nodes):
from time import time
graph = {}
graph['nodes'] = nodes
graph['timestamp'] = time()
f = open(DUMP_FILE,'a')
json.dump(graph,f)
f.write('\n')
f.close()
def write_stat_node(nodes):
''' Write a `stats` node in the corner
This node contains infos about the current number of active nodes and connections inside the network
'''
num_conns = 0
num_nodes = len(nodes)
for k,v in nodes.iteritems():
num_conns+= len(v['to'])
node_text = " stats_node [label=\"Statistics\\l"
node_text += "Active Nodes: %s\\l" % num_nodes
node_text += "Connections : %s\\l" % num_conns
node_text += "\""
node_text += ",fillcolor=green"
node_text += "]"
print(node_text)
def generate_stats(nodes):
""" Generates some statistics of the network and nodes
"""
jlines = []
try:
f = open(DUMP_FILE,'r')
for line in f:
jlines.append(json.loads(line))
f.close()
except Exception,e:
pass
for k,v in nodes.iteritems():
conns = v.get('to',[])
v['num_conns'] = len(conns)
v['avg_weight'] = get_node_avg_weight(conns)
v['availability'] = get_node_availability(k,jlines)
sys.stderr.write( "%s -> %f\n" %(k ,v['availability']))
def get_node_avg_weight(conns):
""" calculates the average weight for the given connections """
if not conns:
sys.syderr.write("get_node_avg_weight: connection parameter empty")
return 9001
else:
return sum([float(c['weight']) for c in conns])/len(conns)
def get_node_availability(name,jlines):
""" calculates the node availability by reading the generated dump file
adding together the uptime of the node and returning the time
parms:
name - node name
jlines - list of already parsed dictionaries node archive
"""
begin = last = current = 0
uptime = 0
#sys.stderr.write ( "Getting Node availability of %s\n" % name)
for stat in jlines:
if not stat['nodes']:
continue
ts = stat['timestamp']
if not begin:
begin = last = ts
current = ts
if stat['nodes'].get(name,{}).get('to',[]):
uptime += current - last
else:
pass
#sys.stderr.write("%s offline at timestamp %f\n" %(name,current))
last = ts
all_the_time = last - begin
try:
return uptime/ all_the_time
except:
return 1
def delete_unused_nodes(nodes):
new_nodes = {}
for k,v in nodes.iteritems():
if v['external-ip'] == "(null)":
continue
if v.get('to',[]):
new_nodes[k] = v
for k,v in new_nodes.iteritems():
if not [ i for i in v['to'] if i['name'] in new_nodes]:
#del(new_nodes[k])
del(k)
return new_nodes
def merge_edges(nodes):
""" merge back and forth edges into one
DESTRUCTS the current structure by deleting "connections" in the nodes
"""
for k,v in nodes.iteritems():
for con in v.get('to',[]):
for i,secon in enumerate(nodes.get(con['name'],{}).get('to',[])):
if k == secon['name']:
del (nodes[con['name']]['to'][i])
con['bidirectional'] = True
def write_node(k,v):
""" writes a single node and its edges
edges are weightet with the informations inside the nodes provided by
tinc
"""
node = " "+k+"[label=\""
node += k+"\\l"
node += "availability: %f\\l" % v['availability']
node += "avg weight: %.2f\\l" % v['avg_weight']
if v.has_key('num_conns'):
node += "Num Connects:"+str(v['num_conns'])+"\\l"
node += "external:"+v['external-ip']+":"+v['external-port']+"\\l"
for addr in v.get('internal-ip',['¯\\\\(°_o)/¯']):
node += "internal:"+addr+"\\l"
node +="\""
if k in supernodes:
node += ",fillcolor=steelblue1"
#node +=",group=\""+v['external-ip'].replace(".","")+"\""
node += "]"
print node
for con in v.get('to',[]):
label = con['weight']
w = int(con['weight'])
weight = str(1000 - (((w - 150) * (1000 - 0)) / (1000 -150 )) + 0)
length = str(float(w)/1500)
#weight = "1000" #str(300/float(con['weight']))
#weight = str((100/float(con['weight'])))
#weight = str(-1 * (200-100000/int(con['weight'])))
if float(weight) < 0 :
weight= "1"
#sys.stderr.write(weight + ":"+ length +" %s -> " %k + str(con) + "\n")
edge = " "+k+ " -> " +con['name'] + "[label="+label + " weight="+weight #+ " minlen="+length
if con.get('bidirectional',False):
edge += ",dir=both"
edge += "]"
print edge
def decode_input(FILE):
return json.load(FILE)
nodes = decode_input(sys.stdin)
nodes = delete_unused_nodes(nodes)
try:
dump_graph(nodes)
except Exception,e:
sys.stderr.write("Cannot dump graph: %s" % str(e))
write_digraph(nodes)
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