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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for implementations of L{IReactorFDSet}.
"""
__metaclass__ = type
import socket
from twisted.internet.interfaces import IReactorFDSet
from twisted.internet.abstract import FileDescriptor
from twisted.internet.test.reactormixins import ReactorBuilder
# twisted.internet.tcp nicely defines some names with proper values on
# several different platforms.
from twisted.internet.tcp import EINPROGRESS, EWOULDBLOCK
class ReactorFDSetTestsBuilder(ReactorBuilder):
"""
Builder defining tests relating to L{IReactorFDSet}.
"""
requiredInterfaces = [IReactorFDSet]
def _connectedPair(self):
"""
Return the two sockets which make up a new TCP connection.
"""
serverSocket = socket.socket()
serverSocket.bind(('127.0.0.1', 0))
serverSocket.listen(1)
self.addCleanup(serverSocket.close)
client = socket.socket()
self.addCleanup(client.close)
client.setblocking(False)
try:
client.connect(('127.0.0.1', serverSocket.getsockname()[1]))
except socket.error, e:
self.assertIn(e.args[0], (EINPROGRESS, EWOULDBLOCK))
except Exception, e:
self.fail("Connect should have succeeded or raised EINPROGRESS or EWOULDBLOCK")
server, addr = serverSocket.accept()
self.addCleanup(server.close)
return client, server
def _simpleSetup(self):
reactor = self.buildReactor()
client, server = self._connectedPair()
fd = FileDescriptor(reactor)
fd.fileno = client.fileno
return reactor, fd, server
def test_addReader(self):
"""
C{reactor.addReader()} accepts an L{IReadDescriptor} provider and calls
its C{doRead} method when there may be data available on its C{fileno}.
"""
reactor, fd, server = self._simpleSetup()
def removeAndStop():
reactor.removeReader(fd)
reactor.stop()
fd.doRead = removeAndStop
reactor.addReader(fd)
server.sendall('x')
# The reactor will only stop if it calls fd.doRead.
self.runReactor(reactor)
# Nothing to assert, just be glad we got this far.
def test_removeReader(self):
"""
L{reactor.removeReader()} accepts an L{IReadDescriptor} provider
previously passed to C{reactor.addReader()} and causes it to no longer
be monitored for input events.
"""
reactor, fd, server = self._simpleSetup()
def fail():
self.fail("doRead should not be called")
fd.doRead = fail
reactor.addReader(fd)
reactor.removeReader(fd)
server.sendall('x')
# Give the reactor two timed event passes to notice that there's I/O
# (if it is incorrectly watching for I/O).
reactor.callLater(0, reactor.callLater, 0, reactor.stop)
self.runReactor(reactor)
# Getting here means the right thing happened probably.
def test_addWriter(self):
"""
C{reactor.addWriter()} accepts an L{IWriteDescriptor} provider and
calls its C{doWrite} method when it may be possible to write to its
C{fileno}.
"""
reactor, fd, server = self._simpleSetup()
def removeAndStop():
reactor.removeWriter(fd)
reactor.stop()
fd.doWrite = removeAndStop
reactor.addWriter(fd)
self.runReactor(reactor)
# Getting here is great.
def _getFDTest(self, kind):
"""
Helper for getReaders and getWriters tests.
"""
reactor = self.buildReactor()
get = getattr(reactor, 'get' + kind + 's')
add = getattr(reactor, 'add' + kind)
remove = getattr(reactor, 'remove' + kind)
client, server = self._connectedPair()
self.assertNotIn(client, get())
self.assertNotIn(server, get())
add(client)
self.assertIn(client, get())
self.assertNotIn(server, get())
remove(client)
self.assertNotIn(client, get())
self.assertNotIn(server, get())
def test_getReaders(self):
"""
L{IReactorFDSet.getReaders} reflects the additions and removals made
with L{IReactorFDSet.addReader} and L{IReactorFDSet.removeReader}.
"""
self._getFDTest('Reader')
def test_removeWriter(self):
"""
L{reactor.removeWriter()} accepts an L{IWriteDescriptor} provider
previously passed to C{reactor.addWriter()} and causes it to no longer
be monitored for outputability.
"""
reactor, fd, server = self._simpleSetup()
def fail():
self.fail("doWrite should not be called")
fd.doWrite = fail
reactor.addWriter(fd)
reactor.removeWriter(fd)
# Give the reactor two timed event passes to notice that there's I/O
# (if it is incorrectly watching for I/O).
reactor.callLater(0, reactor.callLater, 0, reactor.stop)
self.runReactor(reactor)
# Getting here means the right thing happened probably.
def test_getWriters(self):
"""
L{IReactorFDSet.getWriters} reflects the additions and removals made
with L{IReactorFDSet.addWriter} and L{IReactorFDSet.removeWriter}.
"""
self._getFDTest('Writer')
def test_removeAll(self):
"""
C{reactor.removeAll()} removes all registered L{IReadDescriptor}
providers and all registered L{IWriteDescriptor} providers and returns
them.
"""
reactor = self.buildReactor()
reactor, fd, server = self._simpleSetup()
fd.doRead = lambda: self.fail("doRead should not be called")
fd.doWrite = lambda: self.fail("doWrite should not be called")
server.sendall('x')
reactor.addReader(fd)
reactor.addWriter(fd)
removed = reactor.removeAll()
# Give the reactor two timed event passes to notice that there's I/O
# (if it is incorrectly watching for I/O).
reactor.callLater(0, reactor.callLater, 0, reactor.stop)
self.runReactor(reactor)
# Getting here means the right thing happened probably.
self.assertEqual(removed, [fd])
globals().update(ReactorFDSetTestsBuilder.makeTestCaseClasses())
