class Simulator(object):
"""This is a Descrete Event Simulator
*WARNING*
Inside a simulated function, do not directly use `channel.send' of
python stackless, because you'll mess with the schedule of the simulator.
Use instead @microfunc(true/false), or Channel(True) (see lib/micro.py)
*WARNING*
"""
def __init__(self):
self.curtime = 0
self.queue = []
self.looping = False
self.simchan = Channel()
def ev_add(self, ev):
ev.abs_time = self.curtime+ev.exec_time
heappush(self.queue, ev)
if self.curtime > 0 and not self.looping:
self.simchan.sendq(1)
def ev_exec(self):
ev = heappop(self.queue)
self.curtime = ev.abs_time
ev.callf(*ev.callf_args)
def loop(self):
self.looping = True
while self.queue != []:
self.ev_exec()
self.looping = False
def _wake_up_wait(self, chan):
chan.send(())
def wait(self, t):
"""Waits the specified number of time units"""
chan = Channel()
self.ev_add( SimEvent(t, self._wake_up_wait, (chan,)) )
chan.recv()
@microfunc(True)
def run(self):
while 1:
self.loop()
self.simchan.recvq()
class Simulator(object):
"""This is a Descrete Event Simulator
*WARNING*
Inside a simulated function, do not directly use `channel.send' of
python stackless, because you'll mess with the schedule of the simulator.
Use instead @microfunc(true/false), or Channel(True) (see lib/micro.py)
*WARNING*
"""
def __init__(self):
self.curtime = 0
self.queue = []
self.looping = False
self.simchan = Channel()
def ev_add(self, ev):
ev.abs_time = self.curtime + ev.exec_time
heappush(self.queue, ev)
if self.curtime > 0 and not self.looping:
self.simchan.sendq(1)
def ev_exec(self):
ev = heappop(self.queue)
self.curtime = ev.abs_time
ev.callf(*ev.callf_args)
def loop(self):
self.looping = True
while self.queue != []:
self.ev_exec()
self.looping = False
def _wake_up_wait(self, chan):
chan.send(())
def wait(self, t):
"""Waits the specified number of time units"""
chan = Channel()
self.ev_add(SimEvent(t, self._wake_up_wait, (chan, )))
chan.recv()
@microfunc(True)
def run(self):
while 1:
self.loop()
self.simchan.recvq()
class Node(object):
__slots__ = ['neighbours', 'recv_chan', 'accept_chan', 'sk_in', 'sk_out',
'ip']
def __init__(self, ip=None, neighs={}):
self.change_ip(ip)
# {Node: Link}
self.neighbours = {}
self.recv_chan = Channel()
self.accept_chan = Channel()
self.sk_in = {} # {sk: sk_chan}
self.sk_out = {} # {sk: sk_chan}
def change_ip(self, newip=None):
self.ip=newip
if self.ip == None:
self.ip=randint(1, 2**32-1)
def __hash__(self):
return self.ip
def neigh_add(self, n, link):
self.neighbours[n]=link
n.neighbours[self]=link # the links are symmetric
def neigh_del(self, n):
if n in self.neighbours:
del self.neighbours[n]
del n.neighbours[self]
def neigh_del_all(self):
for n in self.neighbours:
self.neigh_del(n)
def calc_time(self, d, sz):
"""Return the time necessary to send a packet of
size `sz', from `self' to `d'"""
return self.neighbours[d].rtt+float(sz)/self.neighbours[d].bw
## Non socket based
def sendto(self, dst, msg):
"""dst: the destination neighbour
msg: the packet itself. It must be a string!
On error hell will be raised"""
if not isinstance(msg, str):
raise ESendMsg, ESendMsg.errstr
if dst not in self.neighbours:
raise ENotNeigh, ENotNeigh.errstr
msglen = len(msg)
ev = SimEvent(self.calc_time(dst, msglen), dst._sendto, (self, msg))
sim.cursim.ev_add(ev)
return msglen
def _sendto(self, sender, msg):
"""Send the msg to the recv channel"""
self.recv_chan.sendq((sender, msg))
def sendtoall(self, msg):
"""Send the msg to all neighbours"""
for n in self.neighbours:
self.sendto(n, msg)
def recvfrom(self):
"""Returns the (sender, msg) pair"""
return self.recv_chan.recvq()
## Socket based
def connect(self, dst):
"""Returns sk_chan, the Channel() of the new established socket"""
if dst not in self.neighbours:
raise ENotNeigh, ENotNeigh.errstr
sk = randint(1, 2**32-1)
self.sk_out[sk]=Channel()
self.sk_in[sk]=Channel()
dst.accept_chan.send((self, sk, self.sk_in[sk], self.sk_out[sk]))
return sk
def accept(self):
"""Returns (sk, src), where sk is the new established socket and
`src' is the instance of the source node"""
src, sk, sk_out, sk_in = self.accept_chan.recv()
self.sk_out[sk]=sk_out
self.sk_in[sk] =sk_in
return sk, src
def send(self, dst, sk, msg):
if not isinstance(msg, str):
raise ESendMsg, ESendMsg.errstr
try:
sk_chan = self.sk_out[sk]
except KeyError:
raise ESkt, ESkt.errstr
msglen = len(msg)
ev = SimEvent(self.calc_time(dst, msglen), dst._send, (sk_chan, msg))
sim.cursim.ev_add(ev)
return msglen
def _send(self, sk_chan, msg):
sk_chan.sendq(msg)
def recv(self, sk):
try:
sk_chan = self.sk_in[sk]
except KeyError:
raise ESkt, ESkt.errstr
return sk_chan.recvq()
def close(self, dst, sk):
if sk in dst.sk_in:
del dst.sk_in[sk]
del dst.sk_out[sk]
if sk in self.sk_in:
del self.sk_in[sk]
del self.sk_out[sk]
class Node(object):
__slots__ = [
'neighbours', 'recv_chan', 'accept_chan', 'sk_in', 'sk_out', 'ip'
]
def __init__(self, ip=None, neighs={}):
self.change_ip(ip)
# {Node: Link}
self.neighbours = {}
self.recv_chan = Channel()
self.accept_chan = Channel()
self.sk_in = {} # {sk: sk_chan}
self.sk_out = {} # {sk: sk_chan}
def change_ip(self, newip=None):
self.ip = newip
if self.ip == None:
self.ip = randint(1, 2**32 - 1)
def __hash__(self):
return self.ip
def neigh_add(self, n, link):
self.neighbours[n] = link
n.neighbours[self] = link # the links are symmetric
def neigh_del(self, n):
if n in self.neighbours:
del self.neighbours[n]
del n.neighbours[self]
def neigh_del_all(self):
for n in self.neighbours:
self.neigh_del(n)
def calc_time(self, d, sz):
"""Return the time necessary to send a packet of
size `sz', from `self' to `d'"""
return self.neighbours[d].rtt + float(sz) / self.neighbours[d].bw
## Non socket based
def sendto(self, dst, msg):
"""dst: the destination neighbour
msg: the packet itself. It must be a string!
On error hell will be raised"""
if not isinstance(msg, str):
raise ESendMsg, ESendMsg.errstr
if dst not in self.neighbours:
raise ENotNeigh, ENotNeigh.errstr
msglen = len(msg)
ev = SimEvent(self.calc_time(dst, msglen), dst._sendto, (self, msg))
sim.cursim.ev_add(ev)
return msglen
def _sendto(self, sender, msg):
"""Send the msg to the recv channel"""
self.recv_chan.sendq((sender, msg))
def sendtoall(self, msg):
"""Send the msg to all neighbours"""
for n in self.neighbours:
self.sendto(n, msg)
def recvfrom(self):
"""Returns the (sender, msg) pair"""
return self.recv_chan.recvq()
## Socket based
def connect(self, dst):
"""Returns sk_chan, the Channel() of the new established socket"""
if dst not in self.neighbours:
raise ENotNeigh, ENotNeigh.errstr
sk = randint(1, 2**32 - 1)
self.sk_out[sk] = Channel()
self.sk_in[sk] = Channel()
dst.accept_chan.send((self, sk, self.sk_in[sk], self.sk_out[sk]))
return sk
def accept(self):
"""Returns (sk, src), where sk is the new established socket and
`src' is the instance of the source node"""
src, sk, sk_out, sk_in = self.accept_chan.recv()
self.sk_out[sk] = sk_out
self.sk_in[sk] = sk_in
return sk, src
def send(self, dst, sk, msg):
if not isinstance(msg, str):
raise ESendMsg, ESendMsg.errstr
try:
sk_chan = self.sk_out[sk]
except KeyError:
raise ESkt, ESkt.errstr
msglen = len(msg)
ev = SimEvent(self.calc_time(dst, msglen), dst._send, (sk_chan, msg))
sim.cursim.ev_add(ev)
return msglen
def _send(self, sk_chan, msg):
sk_chan.sendq(msg)
def recv(self, sk):
try:
sk_chan = self.sk_in[sk]
except KeyError:
raise ESkt, ESkt.errstr
return sk_chan.recvq()
def close(self, dst, sk):
if sk in dst.sk_in:
del dst.sk_in[sk]
del dst.sk_out[sk]
if sk in self.sk_in:
del self.sk_in[sk]
del self.sk_out[sk]
