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'''
Task Coach - Your friendly task manager
Copyright (C) 2011 Task Coach developers <developers@taskcoach.org>
Task Coach is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Task Coach is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
from ctypes import *
import os, tempfile, threading
from taskcoachlib.filesystem import base
_libc = CDLL('libc.dylib')
# Constants
O_EVTONLY = 0x8000
EVFILT_VNODE = -4
EV_ADD = 0x0001
EV_ENABLE = 0x0004
EV_ONESHOT = 0x0010
NOTE_DELETE = 0x00000001
NOTE_EXTEND = 0x00000004
NOTE_WRITE = 0x00000002
NOTE_ATTRIB = 0x00000008
NOTE_LINK = 0x00000010
NOTE_RENAME = 0x00000020
NOTE_REVOKE = 0x00000040
# Structures
class keventstruct(Structure):
_fields_ = [('ident', c_ulong),
('filter', c_int16),
('flags', c_uint16),
('fflags', c_uint32),
('data', c_long),
('udata', c_void_p)]
# Functions
opendir = CFUNCTYPE(c_void_p, c_char_p)(('opendir', _libc))
closedir = CFUNCTYPE(c_int, c_void_p)(('closedir', _libc))
open_ = CFUNCTYPE(c_int, c_char_p, c_int)(('open', _libc))
close = CFUNCTYPE(c_int, c_int)(('close', _libc))
# dirfd seems to be defined as a macro. Let's assume the fd field is
# the first one in the structure.
def dirfd(p):
return cast(p, POINTER(c_int)).contents.value
kqueue = CFUNCTYPE(c_int)(('kqueue', _libc))
kevent = CFUNCTYPE(c_int, c_int, POINTER(keventstruct), c_int, POINTER(keventstruct), c_int, c_void_p)(('kevent', _libc))
# Macros
def EV_SET(kev, ident, filter_, flags, fflags, data, udata):
kev.ident = ident
kev.filter = filter_
kev.flags = flags
kev.fflags = fflags
kev.data = data
kev.udata = udata
def traceEvents(fflags):
names = ['NOTE_WRITE', 'NOTE_EXTEND', 'NOTE_DELETE', 'NOTE_ATTRIB', 'NOTE_LINK', 'NOTE_RENAME', 'NOTE_REVOKE']
return ', '.join([name for name in names if fflags & globals()[name]])
# Higher-evel API
class FileMonitor(object):
def __init__(self, filename, callback):
super(FileMonitor, self).__init__()
self.callback = callback
if isinstance(filename, unicode):
filename = filename.encode('UTF-8') # Not sure...
self._filename = filename
path, name = os.path.split(filename)
self.fd = None
if os.path.exists(filename):
self.fd = open_(filename, O_EVTONLY)
if self.fd < 0:
raise OSError('Could not open "%s"' % filename)
self.state = 2
else:
self.state = 1
self.dir = opendir(path)
if self.dir is None:
close(self.fd)
self.fd = None
raise OSError('Could not open "%s"' % path)
self.dirfd = dirfd(self.dir)
self.cancelled = False
def loop(self):
kq = kqueue()
try:
event = keventstruct()
changes = (keventstruct * 2)()
EV_SET(changes[0], self.dirfd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_ONESHOT,
NOTE_WRITE | NOTE_EXTEND, 0, 0)
if self.fd is not None:
EV_SET(changes[1], self.fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_ONESHOT,
NOTE_WRITE | NOTE_EXTEND | NOTE_DELETE | NOTE_ATTRIB | \
NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, 0)
while True:
if kevent(kq, changes, self.state, byref(event), 1, None) > 0:
if self.cancelled:
break
if self.state == 2:
if event.ident == self.fd and event.fflags & (NOTE_DELETE | NOTE_RENAME):
# File deleted.
close(self.fd)
self.fd = None
self.state = 1
elif event.ident == self.fd:
self.onFileChanged()
elif self.state == 1:
# The event can only concern the directory anyway.
if os.path.exists(self._filename):
# File was re-created
self.fd = open_(self._filename, O_EVTONLY)
if self.fd < 0:
raise OSError('Could not open "%s"' % self._filename)
EV_SET(changes[1], self.fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_ONESHOT,
NOTE_WRITE | NOTE_EXTEND | NOTE_DELETE | NOTE_ATTRIB | \
NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, 0)
self.state = 2
self.onFileChanged()
finally:
close(kq)
def stop(self):
self.cancelled = True
# To break the kevent() call
tempfile.TemporaryFile(dir=os.path.split(self._filename)[0])
def close(self):
if self.fd is not None:
close(self.fd)
self.fd = None
if self.dir is not None:
closedir(self.dir)
self.dir = None
def __del__(self):
self.close()
def onFileChanged(self):
self.callback(self._filename)
class FilesystemNotifier(base.NotifierBase):
def __init__(self):
super(FilesystemNotifier, self).__init__()
self.monitor = None
self.thread = None
self.lock = threading.Lock()
def setFilename(self, filename):
self.lock.acquire()
try:
if self.monitor is not None:
self.monitor.stop()
self.thread.join()
self.monitor.close()
self.monitor = None
self.thread = None
super(FilesystemNotifier, self).setFilename(filename)
if self._filename:
self.monitor = FileMonitor(self._filename, self._onFileChanged)
self.thread = threading.Thread(target=self._run)
self.thread.setDaemon(True)
self.thread.start()
finally:
self.lock.release()
def stop(self):
self.lock.acquire()
try:
if self.monitor is not None:
self.monitor.stop()
self.thread.join()
self.monitor.close()
self.monitor = None
self.thread = None
finally:
self.lock.release()
def _onFileChanged(self, filename):
if self._check(filename):
self.stamp = os.stat(filename).st_mtime
self.onFileChanged()
def onFileChanged(self):
raise NotImplementedError
def _run(self):
self.monitor.loop()
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