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""" Whitebox tests for TCP APIs. """ from __future__ import division, absolute_import import errno, socket, os try: import resource except ImportError: resource = None from twisted.trial.unittest import TestCase from twisted.python import compat, log from twisted.internet.tcp import ( _ACCEPT_ERRORS, ECONNABORTED, EPERM, ENOMEM, ENFILE, EAGAIN, EMFILE, ENOBUFS, EINPROGRESS, EWOULDBLOCK, Port, ) from twisted.internet.protocol import Protocol, ServerFactory from twisted.python.runtime import platform from twisted.internet.defer import maybeDeferred, gatherResults from twisted.internet import reactor, interfaces class PlatformAssumptionsTests(TestCase): """ Test assumptions about platform behaviors. """ socketLimit = 8192 def setUp(self): self.openSockets = [] if resource is not None: # On some buggy platforms we might leak FDs, and the test will # fail creating the initial two sockets we *do* want to # succeed. So, we make the soft limit the current number of fds # plus two more (for the two sockets we want to succeed). If we've # leaked too many fds for that to work, there's nothing we can # do. from twisted.internet.process import _listOpenFDs newLimit = len(_listOpenFDs()) + 2 self.originalFileLimit = resource.getrlimit(resource.RLIMIT_NOFILE) resource.setrlimit(resource.RLIMIT_NOFILE, (newLimit, self.originalFileLimit[1])) self.socketLimit = newLimit + 100 def tearDown(self): while self.openSockets: self.openSockets.pop().close() if resource is not None: # `macOS` implicitly lowers the hard limit in the setrlimit call # above. Retrieve the new hard limit to pass in to this # setrlimit call, so that it doesn't give us a permission denied # error. currentHardLimit = resource.getrlimit(resource.RLIMIT_NOFILE)[1] newSoftLimit = min(self.originalFileLimit[0], currentHardLimit) resource.setrlimit(resource.RLIMIT_NOFILE, (newSoftLimit, currentHardLimit)) def socket(self): """ Create and return a new socket object, also tracking it so it can be closed in the test tear down. """ s = socket.socket() self.openSockets.append(s) return s def test_acceptOutOfFiles(self): """ Test that the platform accept(2) call fails with either L{EMFILE} or L{ENOBUFS} when there are too many file descriptors open. """ # Make a server to which to connect port = self.socket() port.bind(('127.0.0.1', 0)) serverPortNumber = port.getsockname()[1] port.listen(5) # Make a client to use to connect to the server client = self.socket() client.setblocking(False) # Use up all the rest of the file descriptors. for i in range(self.socketLimit): try: self.socket() except socket.error as e: if e.args[0] in (EMFILE, ENOBUFS): # The desired state has been achieved. break else: # Some unexpected error occurred. raise else: self.fail("Could provoke neither EMFILE nor ENOBUFS from platform.") # Non-blocking connect is supposed to fail, but this is not true # everywhere (e.g. freeBSD) self.assertIn(client.connect_ex(('127.0.0.1', serverPortNumber)), (0, EINPROGRESS)) # Make sure that the accept call fails in the way we expect. exc = self.assertRaises(socket.error, port.accept) self.assertIn(exc.args[0], (EMFILE, ENOBUFS)) if platform.getType() == "win32": test_acceptOutOfFiles.skip = ( "Windows requires an unacceptably large amount of resources to " "provoke this behavior in the naive manner.") class SelectReactorTests(TestCase): """ Tests for select-specific failure conditions. """ def setUp(self): self.ports = [] self.messages = [] log.addObserver(self.messages.append) def tearDown(self): log.removeObserver(self.messages.append) return gatherResults([ maybeDeferred(p.stopListening) for p in self.ports]) def port(self, portNumber, factory, interface): """ Create, start, and return a new L{Port}, also tracking it so it can be stopped in the test tear down. """ p = Port(portNumber, factory, interface=interface) p.startListening() self.ports.append(p) return p def _acceptFailureTest(self, socketErrorNumber): """ Test behavior in the face of an exception from C{accept(2)}. On any exception which indicates the platform is unable or unwilling to allocate further resources to us, the existing port should remain listening, a message should be logged, and the exception should not propagate outward from doRead. @param socketErrorNumber: The errno to simulate from accept. """ class FakeSocket(object): """ Pretend to be a socket in an overloaded system. """ def accept(self): raise socket.error( socketErrorNumber, os.strerror(socketErrorNumber)) factory = ServerFactory() port = self.port(0, factory, interface='127.0.0.1') self.patch(port, "socket", FakeSocket()) port.doRead() expectedFormat = "Could not accept new connection ({acceptError})" expectedErrorCode = errno.errorcode[socketErrorNumber] matchingMessages = [ (msg.get('log_format') == expectedFormat and msg.get('acceptError') == expectedErrorCode) for msg in self.messages ] self.assertGreater(len(matchingMessages), 0, "Log event for failed accept not found in " "%r" % (self.messages,)) def test_tooManyFilesFromAccept(self): """ C{accept(2)} can fail with C{EMFILE} when there are too many open file descriptors in the process. Test that this doesn't negatively impact any other existing connections. C{EMFILE} mainly occurs on Linux when the open file rlimit is encountered. """ return self._acceptFailureTest(EMFILE) def test_noBufferSpaceFromAccept(self): """ Similar to L{test_tooManyFilesFromAccept}, but test the case where C{accept(2)} fails with C{ENOBUFS}. This mainly occurs on Windows and FreeBSD, but may be possible on Linux and other platforms as well. """ return self._acceptFailureTest(ENOBUFS) def test_connectionAbortedFromAccept(self): """ Similar to L{test_tooManyFilesFromAccept}, but test the case where C{accept(2)} fails with C{ECONNABORTED}. It is not clear whether this is actually possible for TCP connections on modern versions of Linux. """ return self._acceptFailureTest(ECONNABORTED) def test_noFilesFromAccept(self): """ Similar to L{test_tooManyFilesFromAccept}, but test the case where C{accept(2)} fails with C{ENFILE}. This can occur on Linux when the system has exhausted (!) its supply of inodes. """ return self._acceptFailureTest(ENFILE) if platform.getType() == 'win32': test_noFilesFromAccept.skip = "Windows accept(2) cannot generate ENFILE" def test_noMemoryFromAccept(self): """ Similar to L{test_tooManyFilesFromAccept}, but test the case where C{accept(2)} fails with C{ENOMEM}. On Linux at least, this can sensibly occur, even in a Python program (which eats memory like no ones business), when memory has become fragmented or low memory has been filled (d_alloc calls kmem_cache_alloc calls kmalloc - kmalloc only allocates out of low memory). """ return self._acceptFailureTest(ENOMEM) if platform.getType() == 'win32': test_noMemoryFromAccept.skip = ( "Windows accept(2) cannot generate ENOMEM") def test_acceptScaling(self): """ L{tcp.Port.doRead} increases the number of consecutive C{accept} calls it performs if all of the previous C{accept} calls succeed; otherwise, it reduces the number to the amount of successful calls. """ factory = ServerFactory() factory.protocol = Protocol port = self.port(0, factory, interface='127.0.0.1') self.addCleanup(port.stopListening) clients = [] def closeAll(): for client in clients: client.close() self.addCleanup(closeAll) def connect(): client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) client.connect(("127.0.0.1", port.getHost().port)) return client clients.append(connect()) port.numberAccepts = 1 port.doRead() self.assertGreater(port.numberAccepts, 1) clients.append(connect()) port.doRead() # There was only one outstanding client connection, so only # one accept(2) was possible. self.assertEqual(port.numberAccepts, 1) port.doRead() # There were no outstanding client connections, so only one # accept should be tried next. self.assertEqual(port.numberAccepts, 1) def test_permissionFailure(self): """ C{accept(2)} returning C{EPERM} is treated as a transient failure and the call retried no more than the maximum number of consecutive C{accept(2)} calls. """ maximumNumberOfAccepts = 123 acceptCalls = [0] class FakeSocketWithAcceptLimit(object): """ Pretend to be a socket in an overloaded system whose C{accept} method can only be called C{maximumNumberOfAccepts} times. """ def accept(oself): acceptCalls[0] += 1 if acceptCalls[0] > maximumNumberOfAccepts: self.fail("Maximum number of accept calls exceeded.") raise socket.error(EPERM, os.strerror(EPERM)) # Verify that FakeSocketWithAcceptLimit.accept() fails the # test if the number of accept calls exceeds the maximum. for _ in range(maximumNumberOfAccepts): self.assertRaises(socket.error, FakeSocketWithAcceptLimit().accept) self.assertRaises(self.failureException, FakeSocketWithAcceptLimit().accept) acceptCalls = [0] factory = ServerFactory() port = self.port(0, factory, interface='127.0.0.1') port.numberAccepts = 123 self.patch(port, "socket", FakeSocketWithAcceptLimit()) # This should not loop infinitely. port.doRead() # This is scaled down to 1 because no accept(2)s returned # successfully. self.assertEquals(port.numberAccepts, 1) if platform.getType() == 'win32': test_permissionFailure.skip = ( "Windows accept(2) cannot generate EPERM") def test_unknownSocketErrorRaise(self): """ A C{socket.error} raised by C{accept(2)} whose C{errno} is unknown to the recovery logic is logged. """ knownErrors = list(_ACCEPT_ERRORS) knownErrors.extend([EAGAIN, EPERM, EWOULDBLOCK]) # Windows has object()s stubs for some errnos. unknownAcceptError = max( error for error in knownErrors if isinstance(error, (int, compat.long)) ) + 1 class FakeSocketWithUnknownAcceptError(object): """ Pretend to be a socket in an overloaded system whose C{accept} method can only be called C{maximumNumberOfAccepts} times. """ def accept(oself): raise socket.error(unknownAcceptError, "unknown socket error message") factory = ServerFactory() port = self.port(0, factory, interface='127.0.0.1') self.patch(port, "socket", FakeSocketWithUnknownAcceptError()) port.doRead() failures = self.flushLoggedErrors(socket.error) self.assertEqual(1, len(failures)) self.assertEqual(failures[0].value.args[0], unknownAcceptError) if not interfaces.IReactorFDSet.providedBy(reactor): skipMsg = 'This test only applies to reactors that implement IReactorFDset' PlatformAssumptionsTests.skip = skipMsg SelectReactorTests.skip = skipMsg