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""" tcp module contains listener and sender classes for TCP protocol """ import time from twisted.internet import interfaces from twisted.internet.protocol import ClientFactory, Factory, Protocol from zope.interface.declarations import implementer class TcpListenerConnection(Protocol): """ This per-connection class is instantiated each time sender connects """ def __init__(self): self.stats = 0 def dataReceived(self, data): self.stats += len(data) def connectionLost(self, reason): self.factory.stats += self.stats class TcpListenerFactory(Factory): """ This per-listening socket class is used to instantiate TcpListenerConnections """ protocol = TcpListenerConnection def __init__(self): self.stats = 0 def getResults(self): """ returns the number of bytes received as string""" # XML RPC does not support 64bit int (http://bugs.python.org/issue2985) # so we have to convert the amount of bytes into a string return str(self.stats) @implementer(interfaces.IPushProducer) class Producer(object): """ This producer class generates infinite byte stream for a specified time duration """ def __init__(self, proto, duration): self.proto = proto self.start = time.time() self.produced = 0 self.paused = False self.data = "X" * 65535 self.duration = duration def pauseProducing(self): """This function is called whenever write() to socket would block""" self.paused = True def resumeProducing(self): """This function is called whenever socket becomes writable""" self.paused = False current = time.time() while (not self.paused) and (current < self.start + self.duration): self.proto.transport.write(self.data) self.produced += len(self.data) current = time.time() if current >= self.start + self.duration: self.proto.factory.stats += self.produced self.proto.transport.unregisterProducer() self.proto.transport.loseConnection() def stopProducing(self): pass class TcpSenderConnection(Protocol): """ TCP connection instance class that sends all traffic at full speed. """ def connectionMade(self): producer = Producer(self, self.factory.duration) self.transport.registerProducer(producer, True) producer.resumeProducing() def dataReceived(self, data): self.transport.loseConnection() class TcpSenderFactory(ClientFactory): """ This factory is responsible to instantiate TcpSenderConnection classes each time sender initiates connection """ protocol = TcpSenderConnection def __init__(self, duration): self.duration = duration self.stats = 0 def getResults(self): """Returns amount of bytes sent to the Listener (as a string)""" return str(self.stats)