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# Copyright (c) 2011, 2012 Nicira Networks
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
tcp module contains listener and sender classes for TCP protocol
"""
from twisted.internet.protocol import Factory, ClientFactory, Protocol
from twisted.internet import interfaces
from zope.interface import implements
import time
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)
class Producer(object):
implements(interfaces.IPushProducer)
"""
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)
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