def __transmit(self):
"""Transmit packet."""
packet = self.queue.pop()
log('queue-end %d %d' % (self.id, packet.id))
log('transmit-start %d %d' % (self.id, packet.id))
self.busy = True
yield sleep(packet.size / self.bandwidth)
log('transmit-end %d %d' % (self.id, packet.id))
self.busy = False
if self.queue:
simulator.new_thread(self.__transmit())
log('propogate-start %d %d' % (self.id, packet.id))
yield sleep(self.prop_delay)
log('propogate-end %d %d' % (self.id, packet.id))
yield self.dest.received(packet)
self.rate = rate
def send(self, duration):
"""Sends random messages for specified duration."""
stop_time = simulator.scheduler.get_time() + duration
while stop_time > simulator.scheduler.get_time():
message = ''.join(random.choice(string.letters) for _ in xrange(self.message_len))
self.host.send(Packet(self.host.ip, self.dest, message))
yield sleep(random.expovariate(self.rate))
if __name__ == '__main__':
"""Main method."""
# set up network
host1 = Host('123.0.0.0')
host2 = Host('101.0.0.0')
link1 = Link(host1, host2, prop_delay=0.5, bandwidth=1000)
link2 = Link(host2, host1, prop_delay=0.5, bandwidth=1000)
# set up usage
mlen = 128
usage = .90
rs1 = RandomSender(host1, host2.ip, message_len=mlen, rate=usage*link1.bandwidth/mlen)
rs2 = RandomSender(host2, host1.ip, message_len=mlen, rate=usage*link1.bandwidth/mlen)
# run
simulator.new_thread(rs1.send(duration=10))
simulator.new_thread(rs2.send(duration=10))
logger.level = 4
simulator.run()
def enqueue(self, packet):
"""Called to place this packet in the queue."""
log('queue-start %d %d' % (self.id, packet.id))
self.queue.appendleft(packet)
if not self.busy:
simulator.new_thread(self.__transmit())