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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test code for basic Factory classes.
"""
import pickle
from twisted.trial.unittest import TestCase
from twisted.internet import reactor, defer
from twisted.internet.task import Clock
from twisted.internet.protocol import Factory, ReconnectingClientFactory
from twisted.protocols.basic import Int16StringReceiver
class In(Int16StringReceiver):
def __init__(self):
self.msgs = {}
def connectionMade(self):
self.factory.connections += 1
def stringReceived(self, msg):
n, msg = pickle.loads(msg)
self.msgs[n] = msg
self.sendString(pickle.dumps(n))
def connectionLost(self, reason):
self.factory.allMessages.append(self.msgs)
if len(self.factory.allMessages) >= self.factory.goal:
self.factory.d.callback(None)
class Out(Int16StringReceiver):
msgs = dict([(x, 'X' * x) for x in range(10)])
def __init__(self):
self.msgs = Out.msgs.copy()
def connectionMade(self):
for i in self.msgs.keys():
self.sendString(pickle.dumps( (i, self.msgs[i])))
def stringReceived(self, msg):
n = pickle.loads(msg)
del self.msgs[n]
if not self.msgs:
self.transport.loseConnection()
self.factory.howManyTimes -= 1
if self.factory.howManyTimes <= 0:
self.factory.stopTrying()
class FakeConnector(object):
"""
A fake connector class, to be used to mock connections failed or lost.
"""
def stopConnecting(self):
pass
def connect(self):
pass
class ReconnectingFactoryTestCase(TestCase):
"""
Tests for L{ReconnectingClientFactory}.
"""
def testStopTrying(self):
f = Factory()
f.protocol = In
f.connections = 0
f.allMessages = []
f.goal = 2
f.d = defer.Deferred()
c = ReconnectingClientFactory()
c.initialDelay = c.delay = 0.2
c.protocol = Out
c.howManyTimes = 2
port = reactor.listenTCP(0, f)
self.addCleanup(port.stopListening)
PORT = port.getHost().port
reactor.connectTCP('127.0.0.1', PORT, c)
f.d.addCallback(self._testStopTrying_1, f, c)
return f.d
testStopTrying.timeout = 10
def _testStopTrying_1(self, res, f, c):
self.assertEqual(len(f.allMessages), 2,
"not enough messages -- %s" % f.allMessages)
self.assertEqual(f.connections, 2,
"Number of successful connections incorrect %d" %
f.connections)
self.assertEqual(f.allMessages, [Out.msgs] * 2)
self.failIf(c.continueTrying, "stopTrying never called or ineffective")
def test_stopTryingDoesNotReconnect(self):
"""
Calling stopTrying on a L{ReconnectingClientFactory} doesn't attempt a
retry on any active connector.
"""
class FactoryAwareFakeConnector(FakeConnector):
attemptedRetry = False
def stopConnecting(self):
"""
Behave as though an ongoing connection attempt has now
failed, and notify the factory of this.
"""
f.clientConnectionFailed(self, None)
def connect(self):
"""
Record an attempt to reconnect, since this is what we
are trying to avoid.
"""
self.attemptedRetry = True
f = ReconnectingClientFactory()
f.clock = Clock()
# simulate an active connection - stopConnecting on this connector should
# be triggered when we call stopTrying
f.connector = FactoryAwareFakeConnector()
f.stopTrying()
# make sure we never attempted to retry
self.assertFalse(f.connector.attemptedRetry)
self.assertFalse(f.clock.getDelayedCalls())
def test_serializeUnused(self):
"""
A L{ReconnectingClientFactory} which hasn't been used for anything
can be pickled and unpickled and end up with the same state.
"""
original = ReconnectingClientFactory()
reconstituted = pickle.loads(pickle.dumps(original))
self.assertEqual(original.__dict__, reconstituted.__dict__)
def test_serializeWithClock(self):
"""
The clock attribute of L{ReconnectingClientFactory} is not serialized,
and the restored value sets it to the default value, the reactor.
"""
clock = Clock()
original = ReconnectingClientFactory()
original.clock = clock
reconstituted = pickle.loads(pickle.dumps(original))
self.assertIdentical(reconstituted.clock, None)
def test_deserializationResetsParameters(self):
"""
A L{ReconnectingClientFactory} which is unpickled does not have an
L{IConnector} and has its reconnecting timing parameters reset to their
initial values.
"""
factory = ReconnectingClientFactory()
factory.clientConnectionFailed(FakeConnector(), None)
self.addCleanup(factory.stopTrying)
serialized = pickle.dumps(factory)
unserialized = pickle.loads(serialized)
self.assertEqual(unserialized.connector, None)
self.assertEqual(unserialized._callID, None)
self.assertEqual(unserialized.retries, 0)
self.assertEqual(unserialized.delay, factory.initialDelay)
self.assertEqual(unserialized.continueTrying, True)
def test_parametrizedClock(self):
"""
The clock used by L{ReconnectingClientFactory} can be parametrized, so
that one can cleanly test reconnections.
"""
clock = Clock()
factory = ReconnectingClientFactory()
factory.clock = clock
factory.clientConnectionLost(FakeConnector(), None)
self.assertEqual(len(clock.calls), 1)
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