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""" Tests for L{twisted.test.iosim}. """ from __future__ import absolute_import, division from zope.interface import implementer from twisted.internet.interfaces import IPushProducer from twisted.internet.protocol import Protocol from twisted.test.iosim import FakeTransport, connect from twisted.trial.unittest import TestCase class FakeTransportTests(TestCase): """ Tests for L{FakeTransport}. """ def test_connectionSerial(self): """ Each L{FakeTransport} receives a serial number that uniquely identifies it. """ a = FakeTransport(object(), True) b = FakeTransport(object(), False) self.assertIsInstance(a.serial, int) self.assertIsInstance(b.serial, int) self.assertNotEqual(a.serial, b.serial) def test_writeSequence(self): """ L{FakeTransport.writeSequence} will write a sequence of L{bytes} to the transport. """ a = FakeTransport(object(), False) a.write(b"a") a.writeSequence([b"b", b"c", b"d"]) self.assertEqual(b"".join(a.stream), b"abcd") def test_writeAfterClose(self): """ L{FakeTransport.write} will accept writes after transport was closed, but the data will be silently discarded. """ a = FakeTransport(object(), False) a.write(b"before") a.loseConnection() a.write(b"after") self.assertEqual(b"".join(a.stream), b"before") @implementer(IPushProducer) class StrictPushProducer(object): """ An L{IPushProducer} implementation which produces nothing but enforces preconditions on its state transition methods. """ _state = u"running" def stopProducing(self): if self._state == u"stopped": raise ValueError(u"Cannot stop already-stopped IPushProducer") self._state = u"stopped" def pauseProducing(self): if self._state != u"running": raise ValueError( u"Cannot pause {} IPushProducer".format(self._state) ) self._state = u"paused" def resumeProducing(self): if self._state != u"paused": raise ValueError( u"Cannot resume {} IPushProducer".format(self._state) ) self._state = u"running" class StrictPushProducerTests(TestCase): """ Tests for L{StrictPushProducer}. """ def _initial(self): """ @return: A new L{StrictPushProducer} which has not been through any state changes. """ return StrictPushProducer() def _stopped(self): """ @return: A new, stopped L{StrictPushProducer}. """ producer = StrictPushProducer() producer.stopProducing() return producer def _paused(self): """ @return: A new, paused L{StrictPushProducer}. """ producer = StrictPushProducer() producer.pauseProducing() return producer def _resumed(self): """ @return: A new L{StrictPushProducer} which has been paused and resumed. """ producer = StrictPushProducer() producer.pauseProducing() producer.resumeProducing() return producer def assertStopped(self, producer): """ Assert that the given producer is in the stopped state. @param producer: The producer to verify. @type producer: L{StrictPushProducer} """ self.assertEqual(producer._state, u"stopped") def assertPaused(self, producer): """ Assert that the given producer is in the paused state. @param producer: The producer to verify. @type producer: L{StrictPushProducer} """ self.assertEqual(producer._state, u"paused") def assertRunning(self, producer): """ Assert that the given producer is in the running state. @param producer: The producer to verify. @type producer: L{StrictPushProducer} """ self.assertEqual(producer._state, u"running") def test_stopThenStop(self): """ L{StrictPushProducer.stopProducing} raises L{ValueError} if called when the producer is stopped. """ self.assertRaises(ValueError, self._stopped().stopProducing) def test_stopThenPause(self): """ L{StrictPushProducer.pauseProducing} raises L{ValueError} if called when the producer is stopped. """ self.assertRaises(ValueError, self._stopped().pauseProducing) def test_stopThenResume(self): """ L{StrictPushProducer.resumeProducing} raises L{ValueError} if called when the producer is stopped. """ self.assertRaises(ValueError, self._stopped().resumeProducing) def test_pauseThenStop(self): """ L{StrictPushProducer} is stopped if C{stopProducing} is called on a paused producer. """ producer = self._paused() producer.stopProducing() self.assertStopped(producer) def test_pauseThenPause(self): """ L{StrictPushProducer.pauseProducing} raises L{ValueError} if called on a paused producer. """ producer = self._paused() self.assertRaises(ValueError, producer.pauseProducing) def test_pauseThenResume(self): """ L{StrictPushProducer} is resumed if C{resumeProducing} is called on a paused producer. """ producer = self._paused() producer.resumeProducing() self.assertRunning(producer) def test_resumeThenStop(self): """ L{StrictPushProducer} is stopped if C{stopProducing} is called on a resumed producer. """ producer = self._resumed() producer.stopProducing() self.assertStopped(producer) def test_resumeThenPause(self): """ L{StrictPushProducer} is paused if C{pauseProducing} is called on a resumed producer. """ producer = self._resumed() producer.pauseProducing() self.assertPaused(producer) def test_resumeThenResume(self): """ L{StrictPushProducer.resumeProducing} raises L{ValueError} if called on a resumed producer. """ producer = self._resumed() self.assertRaises(ValueError, producer.resumeProducing) def test_stop(self): """ L{StrictPushProducer} is stopped if C{stopProducing} is called in the initial state. """ producer = self._initial() producer.stopProducing() self.assertStopped(producer) def test_pause(self): """ L{StrictPushProducer} is paused if C{pauseProducing} is called in the initial state. """ producer = self._initial() producer.pauseProducing() self.assertPaused(producer) def test_resume(self): """ L{StrictPushProducer} raises L{ValueError} if C{resumeProducing} is called in the initial state. """ producer = self._initial() self.assertRaises(ValueError, producer.resumeProducing) class IOPumpTests(TestCase): """ Tests for L{IOPump}. """ def _testStreamingProducer(self, mode): """ Connect a couple protocol/transport pairs to an L{IOPump} and then pump it. Verify that a streaming producer registered with one of the transports does not receive invalid L{IPushProducer} method calls and ends in the right state. @param mode: C{u"server"} to test a producer registered with the server transport. C{u"client"} to test a producer registered with the client transport. """ serverProto = Protocol() serverTransport = FakeTransport(serverProto, isServer=True) clientProto = Protocol() clientTransport = FakeTransport(clientProto, isServer=False) pump = connect( serverProto, serverTransport, clientProto, clientTransport, greet=False, ) producer = StrictPushProducer() victim = { u"server": serverTransport, u"client": clientTransport, }[mode] victim.registerProducer(producer, streaming=True) pump.pump() self.assertEqual(u"running", producer._state) def test_serverStreamingProducer(self): """ L{IOPump.pump} does not call C{resumeProducing} on a L{IPushProducer} (stream producer) registered with the server transport. """ self._testStreamingProducer(mode=u"server") def test_clientStreamingProducer(self): """ L{IOPump.pump} does not call C{resumeProducing} on a L{IPushProducer} (stream producer) registered with the client transport. """ self._testStreamingProducer(mode=u"client")