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""" ovsudp contains listener and sender classes for UDP protocol """ import array import struct import time from twisted.internet.protocol import DatagramProtocol from twisted.internet.task import LoopingCall class UdpListener(DatagramProtocol): """ Class that will listen for incoming UDP packets """ def __init__(self): self.stats = [] def datagramReceived(self, data, _1_2): """This function is called each time datagram is received""" try: self.stats.append(struct.unpack_from("Q", data, 0)) except struct.error: pass # ignore packets that are less than 8 bytes of size def getResults(self): """Returns number of packets that were actually received""" return len(self.stats) class UdpSender(DatagramProtocol): """ Class that will send UDP packets to UDP Listener """ def __init__(self, host, count, size, duration): # LoopingCall does not know whether UDP socket is actually writable self.looper = None self.host = host self.count = count self.duration = duration self.start = time.time() self.sent = 0 self.data = array.array('c', 'X' * size) def startProtocol(self): self.looper = LoopingCall(self.sendData) period = self.duration / float(self.count) self.looper.start(period, now=False) def stopProtocol(self): if (self.looper is not None): self.looper.stop() self.looper = None def datagramReceived(self, data, host_port): pass def sendData(self): """This function is called from LoopingCall""" if self.start + self.duration < time.time(): self.looper.stop() self.looper = None self.sent += 1 struct.pack_into('Q', self.data, 0, self.sent) self.transport.write(self.data, self.host) def getResults(self): """Returns number of packets that were sent""" return self.sent