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from cStringIO import StringIO
from twisted.internet.protocol import FileWrapper
class IOPump:
"""Utility to pump data between clients and servers for protocol testing.
Perhaps this is a utility worthy of being in protocol.py?
"""
def __init__(self, client, server, clientIO, serverIO):
self.client = client
self.server = server
self.clientIO = clientIO
self.serverIO = serverIO
def flush(self):
"Pump until there is no more input or output."
while self.pump():
pass
def pump(self):
"""Move data back and forth.
Returns whether any data was moved.
"""
self.clientIO.seek(0)
self.serverIO.seek(0)
cData = self.clientIO.read()
sData = self.serverIO.read()
self.clientIO.seek(0)
self.serverIO.seek(0)
self.clientIO.truncate()
self.serverIO.truncate()
for byte in cData:
self.server.dataReceived(byte)
for byte in sData:
self.client.dataReceived(byte)
if cData or sData:
return 1
else:
return 0
def returnConnected(server, client):
"""Take two Protocol instances and connect them.
"""
cio = StringIO()
sio = StringIO()
client.makeConnection(FileWrapper(cio))
server.makeConnection(FileWrapper(sio))
pump = IOPump(client, server, cio, sio)
# Challenge-response authentication:
pump.flush()
# Uh...
pump.flush()
return pump
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