A simple echo client & server based on twisted framework

from twisted.internet.protocol import Protocol, ServerFactory
from twisted.internet import reactor

__author__ = 'xueleng'

class Echo(Protocol):
def dataReceived(self, data):
self.transport.write(data)

class EchoFactory(ServerFactory):
def buildProtocol(self, addr):
return Echo();

reactor.listenTCP(8000, EchoFactory())
reactor.run()

from twisted.internet.protocol import Protocol, ClientFactory
from twisted.internet import reactor

__author__ = 'xueleng'

class EchoClient(Protocol):
def connectionMade(self):
self.transport.write('Hello, World!')

def dataReceived(self, data):
print 'Server said: %s' % data
self.transport.loseConnection()

class EchoFactory(ClientFactory):
def buildProtocol(self, addr):
return EchoClient()

def clientConnectionFailed(self, connector, reason):
print 'Connection failed'
reactor.stop()

def clientConnectionLost(self, connector, reason):
print 'Connection lose'
reactor.stop()

reactor.connectTCP('localhost', 8000, EchoFactory())
reactor.run()