Current File : //lib/python3/dist-packages/twisted/internet/test/test_posixbase.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.internet.posixbase} and supporting code.
"""
import os
from twisted.internet.defer import Deferred
from twisted.internet.interfaces import IReadDescriptor
from twisted.internet.posixbase import PosixReactorBase, _Waker
from twisted.internet.protocol import ServerFactory
from twisted.python.runtime import platform
from twisted.trial.unittest import TestCase
skipSockets = None
try:
from twisted.internet import unix
from twisted.test.test_unix import ClientProto
except ImportError:
skipSockets = "Platform does not support AF_UNIX sockets"
from twisted.internet import reactor
from twisted.internet.tcp import Port
class WarningCheckerTestCase(TestCase):
"""
A test case that will make sure that no warnings are left unchecked at the end of a test run.
"""
def setUp(self):
super().setUp()
# FIXME:
# https://twistedmatrix.com/trac/ticket/10332
# For now, try to start each test without previous warnings
# on Windows CI environment.
# We still want to see failures on local Windows development environment to make it easier to fix them,
# rather than ignoring the errors.
if os.environ.get("CI", "").lower() == "true" and platform.isWindows():
self.flushWarnings()
def tearDown(self):
try:
super().tearDown()
finally:
warnings = self.flushWarnings()
if os.environ.get("CI", "").lower() == "true" and platform.isWindows():
# FIXME:
# https://twistedmatrix.com/trac/ticket/10332
# For now don't raise errors on Windows as the existing tests are dirty and we don't have the dev resources to fix this.
# If you care about Twisted on Windows, enable this check and hunt for the test that is generating the warnings.
# Note that even with this check disabled, you can still see flaky tests on Windows, as due to stray delayed calls
# the warnings can be generated while another test is running.
return
self.assertEqual(
len(warnings), 0, f"Warnings found at the end of the test:\n{warnings}"
)
class TrivialReactor(PosixReactorBase):
def __init__(self):
self._readers = {}
self._writers = {}
PosixReactorBase.__init__(self)
def addReader(self, reader):
self._readers[reader] = True
def removeReader(self, reader):
del self._readers[reader]
def addWriter(self, writer):
self._writers[writer] = True
def removeWriter(self, writer):
del self._writers[writer]
class PosixReactorBaseTests(WarningCheckerTestCase):
"""
Tests for L{PosixReactorBase}.
"""
def _checkWaker(self, reactor):
self.assertIsInstance(reactor.waker, _Waker)
self.assertIn(reactor.waker, reactor._internalReaders)
self.assertIn(reactor.waker, reactor._readers)
def test_wakerIsInternalReader(self):
"""
When L{PosixReactorBase} is instantiated, it creates a waker and adds
it to its internal readers set.
"""
reactor = TrivialReactor()
self._checkWaker(reactor)
def test_removeAllSkipsInternalReaders(self):
"""
Any L{IReadDescriptor}s in L{PosixReactorBase._internalReaders} are
left alone by L{PosixReactorBase._removeAll}.
"""
reactor = TrivialReactor()
extra = object()
reactor._internalReaders.add(extra)
reactor.addReader(extra)
reactor._removeAll(reactor._readers, reactor._writers)
self._checkWaker(reactor)
self.assertIn(extra, reactor._internalReaders)
self.assertIn(extra, reactor._readers)
def test_removeAllReturnsRemovedDescriptors(self):
"""
L{PosixReactorBase._removeAll} returns a list of removed
L{IReadDescriptor} and L{IWriteDescriptor} objects.
"""
reactor = TrivialReactor()
reader = object()
writer = object()
reactor.addReader(reader)
reactor.addWriter(writer)
removed = reactor._removeAll(reactor._readers, reactor._writers)
self.assertEqual(set(removed), {reader, writer})
self.assertNotIn(reader, reactor._readers)
self.assertNotIn(writer, reactor._writers)
class TCPPortTests(WarningCheckerTestCase):
"""
Tests for L{twisted.internet.tcp.Port}.
"""
if not isinstance(reactor, PosixReactorBase):
skip = "Non-posixbase reactor"
def test_connectionLostFailed(self):
"""
L{Port.stopListening} returns a L{Deferred} which errbacks if
L{Port.connectionLost} raises an exception.
"""
port = Port(12345, ServerFactory())
port.connected = True
port.connectionLost = lambda reason: 1 // 0
return self.assertFailure(port.stopListening(), ZeroDivisionError)
class TimeoutReportReactor(PosixReactorBase):
"""
A reactor which is just barely runnable and which cannot monitor any
readers or writers, and which fires a L{Deferred} with the timeout
passed to its C{doIteration} method as soon as that method is invoked.
"""
def __init__(self):
PosixReactorBase.__init__(self)
self.iterationTimeout = Deferred()
self.now = 100
def addReader(self, reader: IReadDescriptor) -> None:
"""
Ignore the reader. This is necessary because the waker will be
added. However, we won't actually monitor it for any events.
"""
def removeReader(self, reader: IReadDescriptor) -> None:
"""
See L{addReader}.
"""
def removeAll(self):
"""
There are no readers or writers, so there is nothing to remove.
This will be called when the reactor stops, though, so it must be
implemented.
"""
return []
def seconds(self):
"""
Override the real clock with a deterministic one that can be easily
controlled in a unit test.
"""
return self.now
def doIteration(self, timeout):
d = self.iterationTimeout
if d is not None:
self.iterationTimeout = None
d.callback(timeout)
class IterationTimeoutTests(WarningCheckerTestCase):
"""
Tests for the timeout argument L{PosixReactorBase.run} calls
L{PosixReactorBase.doIteration} with in the presence of various delayed
calls.
"""
def _checkIterationTimeout(self, reactor):
timeout = []
reactor.iterationTimeout.addCallback(timeout.append)
reactor.iterationTimeout.addCallback(lambda ignored: reactor.stop())
reactor.run()
return timeout[0]
def test_noCalls(self):
"""
If there are no delayed calls, C{doIteration} is called with a
timeout of L{None}.
"""
reactor = TimeoutReportReactor()
timeout = self._checkIterationTimeout(reactor)
self.assertIsNone(timeout)
def test_delayedCall(self):
"""
If there is a delayed call, C{doIteration} is called with a timeout
which is the difference between the current time and the time at
which that call is to run.
"""
reactor = TimeoutReportReactor()
reactor.callLater(100, lambda: None)
timeout = self._checkIterationTimeout(reactor)
self.assertEqual(timeout, 100)
def test_timePasses(self):
"""
If a delayed call is scheduled and then some time passes, the
timeout passed to C{doIteration} is reduced by the amount of time
which passed.
"""
reactor = TimeoutReportReactor()
reactor.callLater(100, lambda: None)
reactor.now += 25
timeout = self._checkIterationTimeout(reactor)
self.assertEqual(timeout, 75)
def test_multipleDelayedCalls(self):
"""
If there are several delayed calls, C{doIteration} is called with a
timeout which is the difference between the current time and the
time at which the earlier of the two calls is to run.
"""
reactor = TimeoutReportReactor()
reactor.callLater(50, lambda: None)
reactor.callLater(10, lambda: None)
reactor.callLater(100, lambda: None)
timeout = self._checkIterationTimeout(reactor)
self.assertEqual(timeout, 10)
def test_resetDelayedCall(self):
"""
If a delayed call is reset, the timeout passed to C{doIteration} is
based on the interval between the time when reset is called and the
new delay of the call.
"""
reactor = TimeoutReportReactor()
call = reactor.callLater(50, lambda: None)
reactor.now += 25
call.reset(15)
timeout = self._checkIterationTimeout(reactor)
self.assertEqual(timeout, 15)
def test_delayDelayedCall(self):
"""
If a delayed call is re-delayed, the timeout passed to
C{doIteration} is based on the remaining time before the call would
have been made and the additional amount of time passed to the delay
method.
"""
reactor = TimeoutReportReactor()
call = reactor.callLater(50, lambda: None)
reactor.now += 10
call.delay(20)
timeout = self._checkIterationTimeout(reactor)
self.assertEqual(timeout, 60)
def test_cancelDelayedCall(self):
"""
If the only delayed call is canceled, L{None} is the timeout passed
to C{doIteration}.
"""
reactor = TimeoutReportReactor()
call = reactor.callLater(50, lambda: None)
call.cancel()
timeout = self._checkIterationTimeout(reactor)
self.assertIsNone(timeout)
class ConnectedDatagramPortTests(WarningCheckerTestCase):
"""
Test connected datagram UNIX sockets.
"""
if skipSockets is not None:
skip = skipSockets
def test_connectionFailedDoesntCallLoseConnection(self):
"""
L{ConnectedDatagramPort} does not call the deprecated C{loseConnection}
in L{ConnectedDatagramPort.connectionFailed}.
"""
def loseConnection():
"""
Dummy C{loseConnection} method. C{loseConnection} is deprecated and
should not get called.
"""
self.fail("loseConnection is deprecated and should not get called.")
port = unix.ConnectedDatagramPort(None, ClientProto())
port.loseConnection = loseConnection
port.connectionFailed("goodbye")
def test_connectionFailedCallsStopListening(self):
"""
L{ConnectedDatagramPort} calls L{ConnectedDatagramPort.stopListening}
instead of the deprecated C{loseConnection} in
L{ConnectedDatagramPort.connectionFailed}.
"""
self.called = False
def stopListening():
"""
Dummy C{stopListening} method.
"""
self.called = True
port = unix.ConnectedDatagramPort(None, ClientProto())
port.stopListening = stopListening
port.connectionFailed("goodbye")
self.assertTrue(self.called)
class WakerTests(WarningCheckerTestCase):
def test_noWakerConstructionWarnings(self):
"""
No warnings are generated when constructing the waker.
"""
waker = _Waker()
warnings = self.flushWarnings()
self.assertEqual(len(warnings), 0, warnings)
# Explicitly close the waker to leave a clean state at the end of the test.
waker.connectionLost(None)
warnings = self.flushWarnings()
self.assertEqual(len(warnings), 0, warnings)
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