from argparse import ArgumentParser
from collections import defaultdict, OrderedDict
from itertools import combinations
import math
import random
import sys
import simpy
import yaml
import networkx as nx
from communities import types as communities
from routers import types as routers
from traces import types as traces
class Network:
''''''
def __init__(self, env,
packets=None,
node_factory=None,
community=None,
trace=None):
''''''
self.env = env
# contact trace
if trace is None:
trace = traces['random']()
self.trace = trace
self.trace.start(env, self)
# community detection
self.community = community
if community is not None:
self.community.start(env, self)
# packet generation
'''
if packets is None:
packets = packets['uniform']()
self.packets = packets
self.packets_proc = self.packets.process(self.env, self)
'''
# create node network
if node_factory is None:
node_factory = NodeFactory(tick_rate=1, router=routers['direct'])
self.nodes = [
node_factory(env, self, nid)
for nid in range(self.trace.nodes)
]
self.links = [
(a, b)
for a, b in combinations(self.nodes, 2)
]
# set up networkx graph
self.graph = nx.Graph()
self.graph.add_nodes_from(self.nodes)
self.graph.add_edges_from([
(a, b, { 'state': False })
for a, b in self.links
])
# TODO: better packet generation
self.packets = []
for i in range(100):
source, dest = random.choice(self.links)
packet = Packet(i, source, dest, trace.duration, None)
self.packets.append(packet)
source.recv(packet)
def set_link(self, a, b, state):
if isinstance(a, int):
a = self.nodes[a]
if isinstance(b, int):
b = self.nodes[b]
edge = self[a][b]
if edge['state'] == state:
return
if state is None:
state = not edge['state']
edge['state'] = state
if self.community:
self.community.set_link(a, b, state, self.env.now)
def toggle_link(self, a, b):
self.set_link(a, b, None)
def send_link(self, a, b, packet):
''''''
if self[a][b]['state']:
# TODO: transfer delay
b.recv(packet)
else:
raise Exception('Nodes {} and {} not connected'.format(a, b))
def __getitem__(self, node):
''''''
return self.graph[node]
def NodeFactory(router, **kwargs):
nid = -1
def factory(env, network, nid):
nid += 1
return Node(env, network, nid, router=router, **kwargs)
return factory
class Node:
''''''
def __init__(self, env, network, nid,
tick_time=1, router=None):
''''''
self.env = env
self.network = network
self.id = nid
self.tick_time = tick_time
self.ticker = env.process(self.tick())
self.buffer = Buffer(self.env)
# bind router as a class method
if router is None:
router = routers['direct']
self.router = router.__get__(self, Node)
self.router_state = {}
def tick(self):
''''''
while True:
packets_to_delete = []
for packet in self.buffer:
if packet.ttl < self.env.now:
packets_to_delete.append(packet)
continue
if self.router(packet, self.router_state):
packets_to_delete.append(packet)
for packet in packets_to_delete:
self.buffer.remove(packet)
yield self.env.timeout(self.tick_time)
def send(self, to, packet):
# TODO: transfer delay
self.network.send_link(self, to, packet)
def recv(self, packet):
if packet.destination == self:
packet.recv()
else:
self.buffer.add(packet)
@property
def community(self):
return self.network.community[self]
@property
def links(self):
'''
Returns a list of connected links.
'''
links = {
met: data
for met, data in self.network[self].items()
if data['state']
}
return links
def __repr__(self):
return 'Node(id={})'.format(self.id)
class Buffer:
def __init__(self, env, capacity=0):
self.env = env
if capacity <= 0:
self.capacity = float('inf')
else:
self.capacity = capacity
self.buffer = OrderedDict()
self.used = 0
def add(self, packet):
if self.used < self.capacity:
self.used += 1
self.buffer[packet] = None
else:
raise Exception('buffer full')
def remove(self, packet):
self.used -= 1
del self.buffer[packet]
def __contains__(self, packet):
return packet in self.buffer
def __iter__(self):
return iter(self.buffer)
def __len__(self):
return len(self.buffer)
class Packet:
def __init__(self, id, source, destination, ttl, payload):
self.id = id
self.source = source
self.destination = destination
self.ttl = ttl
self.payload = payload
self.recieved = False
self.recieved_count = 0
def recv(self):
self.recieved = True
self.recieved_count += 1
def __str__(self):
return "Packet(id={}, source={}, destination={})".format(
self.id,
self.source,
self.destination
)
def parse_args(args):
parser = ArgumentParser()
parser.add_argument('--seed', '-s', metavar='seed', type=int,
default=42)
parser.add_argument('--trace', '-t', metavar='type', default='random',
choices=[t for t in traces])
parser.add_argument('--trace-args', '-ta', metavar='arg', nargs='+')
parser.add_argument('--router', '-r', metavar='type', default='direct',
choices=[t for t in routers])
parser.add_argument('--router-args', '-ra', metavar='arg', nargs='+')
parser.add_argument('--community', '-c', metavar='type', default='none',
choices=[t for t in communities])
parser.add_argument('--community-args', '-ca', metavar='arg', nargs='+')
parser.add_argument('--node-args', '-na', metavar='arg', nargs='+')
def list_to_args(args):
if args is None:
return {}
else:
args = '\n'.join(args).replace('=',': ')
return yaml.safe_load(args)
args = parser.parse_args(args)
args.trace_args = list_to_args(args.trace_args)
args.router_args = list_to_args(args.router_args)
args.community_args = list_to_args(args.community_args)
args.node_args = list_to_args(args.node_args)
return args
def main(args):
args = parse_args(args)
print(args)
random.seed(args.seed)
env = simpy.Environment()
trace = traces[args.trace](**args.trace_args)
router = routers[args.router]
community = communities[args.community](**args.community_args)
node_factory = NodeFactory(router, **args.node_args)
network = Network(env,
node_factory=node_factory,
community=community,
trace=trace)
while True:
try:
for tick in range(1, 51):
t = tick / 50 * trace.duration
env.run(until=t)
tick = '=' * tick + ' ' * (50 - tick)
print('\rRunning [{}] '.format(tick), end='')
print(' Done!')
print(len([p for p in network.packets if p.recieved]))
return 0
except KeyboardInterrupt:
print('\nBye!')
return 0
if __name__ == '__main__':
exit(main(sys.argv[1:]))