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""" Test cases for twisted.protocols package. """ from twisted.trial import unittest from twisted.protocols import wire, portforward from twisted.python.compat import iterbytes from twisted.internet import reactor, defer, address, protocol from twisted.test import proto_helpers class WireTests(unittest.TestCase): """ Test wire protocols. """ def test_echo(self): """ Test wire.Echo protocol: send some data and check it send it back. """ t = proto_helpers.StringTransport() a = wire.Echo() a.makeConnection(t) a.dataReceived(b"hello") a.dataReceived(b"world") a.dataReceived(b"how") a.dataReceived(b"are") a.dataReceived(b"you") self.assertEqual(t.value(), b"helloworldhowareyou") def test_who(self): """ Test wire.Who protocol. """ t = proto_helpers.StringTransport() a = wire.Who() a.makeConnection(t) self.assertEqual(t.value(), b"root\r\n") def test_QOTD(self): """ Test wire.QOTD protocol. """ t = proto_helpers.StringTransport() a = wire.QOTD() a.makeConnection(t) self.assertEqual(t.value(), b"An apple a day keeps the doctor away.\r\n") def test_discard(self): """ Test wire.Discard protocol. """ t = proto_helpers.StringTransport() a = wire.Discard() a.makeConnection(t) a.dataReceived(b"hello") a.dataReceived(b"world") a.dataReceived(b"how") a.dataReceived(b"are") a.dataReceived(b"you") self.assertEqual(t.value(), b"") class TestableProxyClientFactory(portforward.ProxyClientFactory): """ Test proxy client factory that keeps the last created protocol instance. @ivar protoInstance: the last instance of the protocol. @type protoInstance: L{portforward.ProxyClient} """ def buildProtocol(self, addr): """ Create the protocol instance and keeps track of it. """ proto = portforward.ProxyClientFactory.buildProtocol(self, addr) self.protoInstance = proto return proto class TestableProxyFactory(portforward.ProxyFactory): """ Test proxy factory that keeps the last created protocol instance. @ivar protoInstance: the last instance of the protocol. @type protoInstance: L{portforward.ProxyServer} @ivar clientFactoryInstance: client factory used by C{protoInstance} to create forward connections. @type clientFactoryInstance: L{TestableProxyClientFactory} """ def buildProtocol(self, addr): """ Create the protocol instance, keeps track of it, and makes it use C{clientFactoryInstance} as client factory. """ proto = portforward.ProxyFactory.buildProtocol(self, addr) self.clientFactoryInstance = TestableProxyClientFactory() # Force the use of this specific instance proto.clientProtocolFactory = lambda: self.clientFactoryInstance self.protoInstance = proto return proto class PortforwardingTests(unittest.TestCase): """ Test port forwarding. """ def setUp(self): self.serverProtocol = wire.Echo() self.clientProtocol = protocol.Protocol() self.openPorts = [] def tearDown(self): try: self.proxyServerFactory.protoInstance.transport.loseConnection() except AttributeError: pass try: pi = self.proxyServerFactory.clientFactoryInstance.protoInstance pi.transport.loseConnection() except AttributeError: pass try: self.clientProtocol.transport.loseConnection() except AttributeError: pass try: self.serverProtocol.transport.loseConnection() except AttributeError: pass return defer.gatherResults( [defer.maybeDeferred(p.stopListening) for p in self.openPorts]) def test_portforward(self): """ Test port forwarding through Echo protocol. """ realServerFactory = protocol.ServerFactory() realServerFactory.protocol = lambda: self.serverProtocol realServerPort = reactor.listenTCP(0, realServerFactory, interface='127.0.0.1') self.openPorts.append(realServerPort) self.proxyServerFactory = TestableProxyFactory('127.0.0.1', realServerPort.getHost().port) proxyServerPort = reactor.listenTCP(0, self.proxyServerFactory, interface='127.0.0.1') self.openPorts.append(proxyServerPort) nBytes = 1000 received = [] d = defer.Deferred() def testDataReceived(data): received.extend(iterbytes(data)) if len(received) >= nBytes: self.assertEqual(b''.join(received), b'x' * nBytes) d.callback(None) self.clientProtocol.dataReceived = testDataReceived def testConnectionMade(): self.clientProtocol.transport.write(b'x' * nBytes) self.clientProtocol.connectionMade = testConnectionMade clientFactory = protocol.ClientFactory() clientFactory.protocol = lambda: self.clientProtocol reactor.connectTCP( '127.0.0.1', proxyServerPort.getHost().port, clientFactory) return d def test_registerProducers(self): """ The proxy client registers itself as a producer of the proxy server and vice versa. """ # create a ProxyServer instance addr = address.IPv4Address('TCP', '127.0.0.1', 0) server = portforward.ProxyFactory('127.0.0.1', 0).buildProtocol(addr) # set the reactor for this test reactor = proto_helpers.MemoryReactor() server.reactor = reactor # make the connection serverTransport = proto_helpers.StringTransport() server.makeConnection(serverTransport) # check that the ProxyClientFactory is connecting to the backend self.assertEqual(len(reactor.tcpClients), 1) # get the factory instance and check it's the one we expect host, port, clientFactory, timeout, _ = reactor.tcpClients[0] self.assertIsInstance(clientFactory, portforward.ProxyClientFactory) # Connect it client = clientFactory.buildProtocol(addr) clientTransport = proto_helpers.StringTransport() client.makeConnection(clientTransport) # check that the producers are registered self.assertIs(clientTransport.producer, serverTransport) self.assertIs(serverTransport.producer, clientTransport) # check the streaming attribute in both transports self.assertTrue(clientTransport.streaming) self.assertTrue(serverTransport.streaming) class StringTransportTests(unittest.TestCase): """ Test L{proto_helpers.StringTransport} helper behaviour. """ def test_noUnicode(self): """ Test that L{proto_helpers.StringTransport} doesn't accept unicode data. """ s = proto_helpers.StringTransport() self.assertRaises(TypeError, s.write, u'foo')