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""" Test case for L{twisted.protocols.loopback}. """ from __future__ import division, absolute_import from zope.interface import implementer from twisted.python.compat import intToBytes from twisted.trial import unittest from twisted.protocols import basic, loopback from twisted.internet import defer from twisted.internet.protocol import Protocol from twisted.internet.defer import Deferred from twisted.internet.interfaces import IAddress, IPushProducer, IPullProducer from twisted.internet import reactor, interfaces class SimpleProtocol(basic.LineReceiver): def __init__(self): self.conn = defer.Deferred() self.lines = [] self.connLost = [] def connectionMade(self): self.conn.callback(None) def lineReceived(self, line): self.lines.append(line) def connectionLost(self, reason): self.connLost.append(reason) class DoomProtocol(SimpleProtocol): i = 0 def lineReceived(self, line): self.i += 1 if self.i < 4: # by this point we should have connection closed, # but just in case we didn't we won't ever send 'Hello 4' self.sendLine(b"Hello " + intToBytes(self.i)) SimpleProtocol.lineReceived(self, line) if self.lines[-1] == b"Hello 3": self.transport.loseConnection() class LoopbackTestCaseMixin: def testRegularFunction(self): s = SimpleProtocol() c = SimpleProtocol() def sendALine(result): s.sendLine(b"THIS IS LINE ONE!") s.transport.loseConnection() s.conn.addCallback(sendALine) def check(ignored): self.assertEqual(c.lines, [b"THIS IS LINE ONE!"]) self.assertEqual(len(s.connLost), 1) self.assertEqual(len(c.connLost), 1) d = defer.maybeDeferred(self.loopbackFunc, s, c) d.addCallback(check) return d def testSneakyHiddenDoom(self): s = DoomProtocol() c = DoomProtocol() def sendALine(result): s.sendLine(b"DOOM LINE") s.conn.addCallback(sendALine) def check(ignored): self.assertEqual(s.lines, [b'Hello 1', b'Hello 2', b'Hello 3']) self.assertEqual( c.lines, [b'DOOM LINE', b'Hello 1', b'Hello 2', b'Hello 3']) self.assertEqual(len(s.connLost), 1) self.assertEqual(len(c.connLost), 1) d = defer.maybeDeferred(self.loopbackFunc, s, c) d.addCallback(check) return d class LoopbackAsyncTests(LoopbackTestCaseMixin, unittest.TestCase): loopbackFunc = staticmethod(loopback.loopbackAsync) def test_makeConnection(self): """ Test that the client and server protocol both have makeConnection invoked on them by loopbackAsync. """ class TestProtocol(Protocol): transport = None def makeConnection(self, transport): self.transport = transport server = TestProtocol() client = TestProtocol() loopback.loopbackAsync(server, client) self.assertIsNotNone(client.transport) self.assertIsNotNone(server.transport) def _hostpeertest(self, get, testServer): """ Test one of the permutations of client/server host/peer. """ class TestProtocol(Protocol): def makeConnection(self, transport): Protocol.makeConnection(self, transport) self.onConnection.callback(transport) if testServer: server = TestProtocol() d = server.onConnection = Deferred() client = Protocol() else: server = Protocol() client = TestProtocol() d = client.onConnection = Deferred() loopback.loopbackAsync(server, client) def connected(transport): host = getattr(transport, get)() self.assertTrue(IAddress.providedBy(host)) return d.addCallback(connected) def test_serverHost(self): """ Test that the server gets a transport with a properly functioning implementation of L{ITransport.getHost}. """ return self._hostpeertest("getHost", True) def test_serverPeer(self): """ Like C{test_serverHost} but for L{ITransport.getPeer} """ return self._hostpeertest("getPeer", True) def test_clientHost(self, get="getHost"): """ Test that the client gets a transport with a properly functioning implementation of L{ITransport.getHost}. """ return self._hostpeertest("getHost", False) def test_clientPeer(self): """ Like C{test_clientHost} but for L{ITransport.getPeer}. """ return self._hostpeertest("getPeer", False) def _greetingtest(self, write, testServer): """ Test one of the permutations of write/writeSequence client/server. @param write: The name of the method to test, C{"write"} or C{"writeSequence"}. """ class GreeteeProtocol(Protocol): bytes = b"" def dataReceived(self, bytes): self.bytes += bytes if self.bytes == b"bytes": self.received.callback(None) class GreeterProtocol(Protocol): def connectionMade(self): if write == "write": self.transport.write(b"bytes") else: self.transport.writeSequence([b"byt", b"es"]) if testServer: server = GreeterProtocol() client = GreeteeProtocol() d = client.received = Deferred() else: server = GreeteeProtocol() d = server.received = Deferred() client = GreeterProtocol() loopback.loopbackAsync(server, client) return d def test_clientGreeting(self): """ Test that on a connection where the client speaks first, the server receives the bytes sent by the client. """ return self._greetingtest("write", False) def test_clientGreetingSequence(self): """ Like C{test_clientGreeting}, but use C{writeSequence} instead of C{write} to issue the greeting. """ return self._greetingtest("writeSequence", False) def test_serverGreeting(self, write="write"): """ Test that on a connection where the server speaks first, the client receives the bytes sent by the server. """ return self._greetingtest("write", True) def test_serverGreetingSequence(self): """ Like C{test_serverGreeting}, but use C{writeSequence} instead of C{write} to issue the greeting. """ return self._greetingtest("writeSequence", True) def _producertest(self, producerClass): toProduce = list(map(intToBytes, range(0, 10))) class ProducingProtocol(Protocol): def connectionMade(self): self.producer = producerClass(list(toProduce)) self.producer.start(self.transport) class ReceivingProtocol(Protocol): bytes = b"" def dataReceived(self, data): self.bytes += data if self.bytes == b''.join(toProduce): self.received.callback((client, server)) server = ProducingProtocol() client = ReceivingProtocol() client.received = Deferred() loopback.loopbackAsync(server, client) return client.received def test_pushProducer(self): """ Test a push producer registered against a loopback transport. """ @implementer(IPushProducer) class PushProducer(object): resumed = False def __init__(self, toProduce): self.toProduce = toProduce def resumeProducing(self): self.resumed = True def start(self, consumer): self.consumer = consumer consumer.registerProducer(self, True) self._produceAndSchedule() def _produceAndSchedule(self): if self.toProduce: self.consumer.write(self.toProduce.pop(0)) reactor.callLater(0, self._produceAndSchedule) else: self.consumer.unregisterProducer() d = self._producertest(PushProducer) def finished(results): (client, server) = results self.assertFalse( server.producer.resumed, "Streaming producer should not have been resumed.") d.addCallback(finished) return d def test_pullProducer(self): """ Test a pull producer registered against a loopback transport. """ @implementer(IPullProducer) class PullProducer(object): def __init__(self, toProduce): self.toProduce = toProduce def start(self, consumer): self.consumer = consumer self.consumer.registerProducer(self, False) def resumeProducing(self): self.consumer.write(self.toProduce.pop(0)) if not self.toProduce: self.consumer.unregisterProducer() return self._producertest(PullProducer) def test_writeNotReentrant(self): """ L{loopback.loopbackAsync} does not call a protocol's C{dataReceived} method while that protocol's transport's C{write} method is higher up on the stack. """ class Server(Protocol): def dataReceived(self, bytes): self.transport.write(b"bytes") class Client(Protocol): ready = False def connectionMade(self): reactor.callLater(0, self.go) def go(self): self.transport.write(b"foo") self.ready = True def dataReceived(self, bytes): self.wasReady = self.ready self.transport.loseConnection() server = Server() client = Client() d = loopback.loopbackAsync(client, server) def cbFinished(ignored): self.assertTrue(client.wasReady) d.addCallback(cbFinished) return d def test_pumpPolicy(self): """ The callable passed as the value for the C{pumpPolicy} parameter to L{loopbackAsync} is called with a L{_LoopbackQueue} of pending bytes and a protocol to which they should be delivered. """ pumpCalls = [] def dummyPolicy(queue, target): bytes = [] while queue: bytes.append(queue.get()) pumpCalls.append((target, bytes)) client = Protocol() server = Protocol() finished = loopback.loopbackAsync(server, client, dummyPolicy) self.assertEqual(pumpCalls, []) client.transport.write(b"foo") client.transport.write(b"bar") server.transport.write(b"baz") server.transport.write(b"quux") server.transport.loseConnection() def cbComplete(ignored): self.assertEqual( pumpCalls, # The order here is somewhat arbitrary. The implementation # happens to always deliver data to the client first. [(client, [b"baz", b"quux", None]), (server, [b"foo", b"bar"])]) finished.addCallback(cbComplete) return finished def test_identityPumpPolicy(self): """ L{identityPumpPolicy} is a pump policy which calls the target's C{dataReceived} method one for each string in the queue passed to it. """ bytes = [] client = Protocol() client.dataReceived = bytes.append queue = loopback._LoopbackQueue() queue.put(b"foo") queue.put(b"bar") queue.put(None) loopback.identityPumpPolicy(queue, client) self.assertEqual(bytes, [b"foo", b"bar"]) def test_collapsingPumpPolicy(self): """ L{collapsingPumpPolicy} is a pump policy which calls the target's C{dataReceived} only once with all of the strings in the queue passed to it joined together. """ bytes = [] client = Protocol() client.dataReceived = bytes.append queue = loopback._LoopbackQueue() queue.put(b"foo") queue.put(b"bar") queue.put(None) loopback.collapsingPumpPolicy(queue, client) self.assertEqual(bytes, [b"foobar"]) class LoopbackTCPTests(LoopbackTestCaseMixin, unittest.TestCase): loopbackFunc = staticmethod(loopback.loopbackTCP) class LoopbackUNIXTests(LoopbackTestCaseMixin, unittest.TestCase): loopbackFunc = staticmethod(loopback.loopbackUNIX) if interfaces.IReactorUNIX(reactor, None) is None: skip = "Current reactor does not support UNIX sockets" class LoopbackRelayTest(unittest.TestCase): """ Test for L{twisted.protocols.loopback.LoopbackRelay} """ class Receiver(Protocol): """ Simple Receiver class used for testing LoopbackRelay """ data = b'' def dataReceived(self, data): "Accumulate received data for verification" self.data += data def test_write(self): "Test to verify that the write function works as expected" receiver = self.Receiver() relay = loopback.LoopbackRelay(receiver) relay.write(b'abc') relay.write(b'def') self.assertEqual(receiver.data, b'') relay.clearBuffer() self.assertEqual(receiver.data, b'abcdef') def test_writeSequence(self): "Test to verify that the writeSequence function works as expected" receiver = self.Receiver() relay = loopback.LoopbackRelay(receiver) relay.writeSequence( [b'The ', b'quick ', b'brown ', b'fox ']) relay.writeSequence( [b'jumps ', b'over ', b'the lazy dog']) self.assertEqual(receiver.data, b'') relay.clearBuffer() self.assertEqual( receiver.data, b'The quick brown fox jumps over the lazy dog')