/usr/share/pyshared/txzookeeper/tests/proxy.py is in python-txzookeeper 0.9.5-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2010-2011 Canonical Ltd. All Rights Reserved
#
# This file is part of txzookeeper.
#
# Authors:
# Kapil Thangavelu
#
# txzookeeper is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# txzookeeper is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with txzookeeper. If not, see <http://www.gnu.org/licenses/>.
#
from twisted.protocols import portforward
class Blockable(object):
_blocked = None
def set_blocked(self, value):
value = bool(value)
self._blocked = value
if self.transport and not self._blocked:
self.transport.resumeProducing()
class ProxyClient(portforward.ProxyClient, Blockable):
def dataReceived(self, data):
if self._blocked:
return
portforward.ProxyClient.dataReceived(self, data)
def setServer(self, server):
server.set_blocked(self._blocked)
super(ProxyClient, self).setServer(server)
def connectionMade(self):
self.peer.setPeer(self)
if not self._blocked:
# The server waits till the client is connected
self.peer.transport.resumeProducing()
else:
self.transport.pauseProducing()
class ProxyClientFactory(portforward.ProxyClientFactory):
protocol = ProxyClient
class ProxyServer(portforward.ProxyServer, Blockable):
clientProtocolFactory = ProxyClientFactory
def dataReceived(self, data):
if self._blocked:
return
portforward.ProxyServer.dataReceived(self, data)
class ProxyFactory(portforward.ProxyFactory):
protocol = ProxyServer
instance = _blocked = False
def lose_connection(self):
"""Terminate both ends of the proxy connection."""
if self.instance:
self.instance.transport.loseConnection()
if self.instance.peer:
self.instance.peer.transport.loseConnection()
def set_blocked(self, value):
self._blocked = bool(value)
if self.instance:
self.instance.set_blocked(self._blocked)
if self.instance.peer:
self.instance.peer.set_blocked(self._blocked)
def buildProtocol(self, addr):
# Track last protocol used, on reconnect any pauses are disabled.
self.instance = portforward.ProxyFactory.buildProtocol(self, addr)
# Propogate the value, the client will aggressively try to
# reconnect else.
self.instance.set_blocked(self._blocked)
return self.instance
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