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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.internet.stdio}.
"""
from twisted.internet.protocol import Protocol
from twisted.internet.test.reactormixins import ReactorBuilder
from twisted.python.runtime import platform
if not platform.isWindows():
from twisted.internet.stdio import StandardIO
class StdioFilesTests(ReactorBuilder):
"""
L{StandardIO} supports reading and writing to filesystem files.
"""
def setUp(self):
path = self.mktemp()
open(path, "wb").close()
self.extraFile = open(path, "rb+")
self.addCleanup(self.extraFile.close)
def test_addReader(self):
"""
Adding a filesystem file reader to a reactor will make sure it is
polled.
"""
reactor = self.buildReactor()
class DataProtocol(Protocol):
data = b""
def dataReceived(self, data):
self.data += data
# It'd be better to stop reactor on connectionLost, but that
# fails on FreeBSD, probably due to
# http://bugs.python.org/issue9591:
if self.data == b"hello!":
reactor.stop()
path = self.mktemp()
with open(path, "wb") as f:
f.write(b"hello!")
with open(path, "rb") as f:
# Read bytes from a file, deliver them to a protocol instance:
protocol = DataProtocol()
StandardIO(
protocol,
stdin=f.fileno(),
stdout=self.extraFile.fileno(),
reactor=reactor,
)
self.runReactor(reactor)
self.assertEqual(protocol.data, b"hello!")
def test_addWriter(self):
"""
Adding a filesystem file writer to a reactor will make sure it is
polled.
"""
reactor = self.buildReactor()
class DisconnectProtocol(Protocol):
def connectionLost(self, reason):
reactor.stop()
path = self.mktemp()
with open(path, "wb") as f:
# Write bytes to a transport, hopefully have them written to a
# file:
protocol = DisconnectProtocol()
StandardIO(
protocol,
stdout=f.fileno(),
stdin=self.extraFile.fileno(),
reactor=reactor,
)
protocol.transport.write(b"hello")
protocol.transport.write(b", world")
protocol.transport.loseConnection()
self.runReactor(reactor)
with open(path, "rb") as f:
self.assertEqual(f.read(), b"hello, world")
def test_removeReader(self):
"""
Removing a filesystem file reader from a reactor will make sure it is
no longer polled.
"""
reactor = self.buildReactor()
self.addCleanup(self.unbuildReactor, reactor)
path = self.mktemp()
open(path, "wb").close()
with open(path, "rb") as f:
# Have the reader added:
stdio = StandardIO(
Protocol(),
stdin=f.fileno(),
stdout=self.extraFile.fileno(),
reactor=reactor,
)
self.assertIn(stdio._reader, reactor.getReaders())
stdio._reader.stopReading()
self.assertNotIn(stdio._reader, reactor.getReaders())
def test_removeWriter(self):
"""
Removing a filesystem file writer from a reactor will make sure it is
no longer polled.
"""
reactor = self.buildReactor()
self.addCleanup(self.unbuildReactor, reactor)
# Cleanup might fail if file is GCed too soon:
self.f = f = open(self.mktemp(), "wb")
# Have the reader added:
protocol = Protocol()
stdio = StandardIO(
protocol, stdout=f.fileno(), stdin=self.extraFile.fileno(), reactor=reactor
)
protocol.transport.write(b"hello")
self.assertIn(stdio._writer, reactor.getWriters())
stdio._writer.stopWriting()
self.assertNotIn(stdio._writer, reactor.getWriters())
def test_removeAll(self):
"""
Calling C{removeAll} on a reactor includes descriptors that are
filesystem files.
"""
reactor = self.buildReactor()
self.addCleanup(self.unbuildReactor, reactor)
path = self.mktemp()
open(path, "wb").close()
# Cleanup might fail if file is GCed too soon:
self.f = f = open(path, "rb")
# Have the reader added:
stdio = StandardIO(
Protocol(),
stdin=f.fileno(),
stdout=self.extraFile.fileno(),
reactor=reactor,
)
# And then removed:
removed = reactor.removeAll()
self.assertIn(stdio._reader, removed)
self.assertNotIn(stdio._reader, reactor.getReaders())
def test_getReaders(self):
"""
C{reactor.getReaders} includes descriptors that are filesystem files.
"""
reactor = self.buildReactor()
self.addCleanup(self.unbuildReactor, reactor)
path = self.mktemp()
open(path, "wb").close()
# Cleanup might fail if file is GCed too soon:
with open(path, "rb") as f:
# Have the reader added:
stdio = StandardIO(
Protocol(),
stdin=f.fileno(),
stdout=self.extraFile.fileno(),
reactor=reactor,
)
self.assertIn(stdio._reader, reactor.getReaders())
def test_getWriters(self):
"""
C{reactor.getWriters} includes descriptors that are filesystem files.
"""
reactor = self.buildReactor()
self.addCleanup(self.unbuildReactor, reactor)
# Cleanup might fail if file is GCed too soon:
self.f = f = open(self.mktemp(), "wb")
# Have the reader added:
stdio = StandardIO(
Protocol(),
stdout=f.fileno(),
stdin=self.extraFile.fileno(),
reactor=reactor,
)
self.assertNotIn(stdio._writer, reactor.getWriters())
stdio._writer.startWriting()
self.assertIn(stdio._writer, reactor.getWriters())
if platform.isWindows():
skip = (
"StandardIO does not accept stdout as an argument to Windows. "
"Testing redirection to a file is therefore harder."
)
globals().update(StdioFilesTests.makeTestCaseClasses())
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