/usr/lib/python2.7/dist-packages/twext/internet/fswatch.py is in python-twext 0.1.b2.dev15059-1.
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# Copyright (c) 2013-2015 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
"""
Watch the availablity of a file system directory
"""
import os
from zope.interface import Interface
from twisted.internet import reactor
from twisted.python.log import Logger
try:
from select import (
kevent, KQ_FILTER_VNODE, KQ_EV_ADD, KQ_EV_ENABLE,
KQ_EV_CLEAR, KQ_NOTE_DELETE, KQ_NOTE_RENAME, KQ_EV_EOF
)
kqueueSupported = True
except ImportError:
# kqueue not supported on this platform
kqueueSupported = False
class IDirectoryChangeListenee(Interface):
"""
A delegate of DirectoryChangeListener
"""
def disconnected():
"""
The directory has been unmounted
"""
def deleted():
"""
The directory has been deleted
"""
def renamed():
"""
The directory has been renamed
"""
def connectionLost(reason):
"""
The file descriptor has been closed
"""
# TODO: better way to tell if reactor is kqueue or not
if kqueueSupported and hasattr(reactor, "_doWriteOrRead"):
def patchReactor(reactor):
# Wrap _doWriteOrRead to support KQ_FILTER_VNODE
origDoWriteOrRead = reactor._doWriteOrRead
def _doWriteOrReadOrVNodeEvent(selectable, fd, event):
origDoWriteOrRead(selectable, fd, event)
if event.filter == KQ_FILTER_VNODE:
selectable.vnodeEventHappened(event)
reactor._doWriteOrRead = _doWriteOrReadOrVNodeEvent
patchReactor(reactor)
class DirectoryChangeListener(Logger, object):
"""
Listens for the removal, renaming, or general unavailability of a
given directory, and lets a delegate listenee know about them.
"""
def __init__(self, reactor, dirname, listenee):
"""
@param reactor: the reactor
@param dirname: the full path to the directory to watch; it must
already exist
@param listenee: the delegate to call
@type listenee: IDirectoryChangeListenee
"""
self._reactor = reactor
self._fd = os.open(dirname, os.O_RDONLY)
self._dirname = dirname
self._listenee = listenee
def logPrefix(self):
return repr(self._dirname)
def fileno(self):
return self._fd
def vnodeEventHappened(self, evt):
if evt.flags & KQ_EV_EOF:
self._listenee.disconnected()
if evt.fflags & KQ_NOTE_DELETE:
self._listenee.deleted()
if evt.fflags & KQ_NOTE_RENAME:
self._listenee.renamed()
def startListening(self):
ke = kevent(self._fd, filter=KQ_FILTER_VNODE,
flags=(KQ_EV_ADD | KQ_EV_ENABLE | KQ_EV_CLEAR),
fflags=KQ_NOTE_DELETE | KQ_NOTE_RENAME)
self._reactor._kq.control([ke], 0, None)
self._reactor._selectables[self._fd] = self
def connectionLost(self, reason):
os.close(self._fd)
self._listenee.connectionLost(reason)
else:
# TODO: implement this for systems without kqueue support:
class DirectoryChangeListener(Logger, object):
"""
Listens for the removal, renaming, or general unavailability of a
given directory, and lets a delegate listenee know about them.
"""
def __init__(self, reactor, dirname, listenee):
"""
@param reactor: the reactor
@param dirname: the full path to the directory to watch; it must
already exist
@param listenee: the delegate to call
@type listenee: IDirectoryChangeListenee
"""
self._reactor = reactor
self._fd = os.open(dirname, os.O_RDONLY)
self._dirname = dirname
self._listenee = listenee
def logPrefix(self):
return repr(self._dirname)
def fileno(self):
return self._fd
def vnodeEventHappened(self, evt):
pass
def startListening(self):
pass
def connectionLost(self, reason):
os.close(self._fd)
self._listenee.connectionLost(reason)
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