InotifyTool.py
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##############################################################################
#
# Copyright (c) 2011 Nexedi SARL and Contributors. All Rights Reserved.
# Julien Muchembled <jm@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
##############################################################################
import errno, glob, os, threading
from AccessControl import ClassSecurityInfo
from Acquisition import aq_base
from Products.ERP5Type.Tool.BaseTool import BaseTool
from Products.ERP5Type.TransactionalVariable import TransactionalResource
from Products.ERP5Type import Permissions
from Products.ERP5.mixin.timer_service import TimerServiceMixin
from AccessControl.SecurityManagement import newSecurityManager, \
getSecurityManager, setSecurityManager
# TODO: Current API was designed to avoid compability issues in case it is
# reimplemented using https://pypi.python.org/pypi/pyinotify
IN_CREATE = 1
IN_MODIFY = 2
IN_DELETE = 512
timerservice_lock = threading.Lock()
inotify_state_dict = {}
class InotifyTool(TimerServiceMixin, BaseTool):
"""
"""
id = 'portal_inotify'
meta_type = 'ERP5 Inotify Tool'
portal_type = 'Inotify Tool'
def resetCache(self):
self._p_changed = 1
try:
del self._v_notify_list
except AttributeError:
pass
def process_timer(self, tick, interval, prev="", next=""):
if timerservice_lock.acquire(0):
try:
try:
notify_list = aq_base(self)._v_notify_list
except AttributeError:
current_node = self.getCurrentNode()
self._v_notify_list = notify_list = [x.getId()
for x in self.objectValues()
if x.isEnabled() and current_node in x.getNodeList()]
update_state_dict = {}
original_security_manager = getSecurityManager()
for notify_id in notify_list:
notify = self._getOb(notify_id)
newSecurityManager(None, notify.getWrappedOwner())
try:
inode_path = notify.getInodePath()
if inode_path:
path = notify.getPath()
state = inotify_state_dict.get(path, {})
new_state = {}
for inode_path in glob.glob(inode_path):
for name in os.listdir(inode_path):
p = os.path.join(inode_path, name)
try:
s = os.lstat(p)
except OSError, e:
if e.errno != errno.ENOENT:
raise
else:
new_state[p] = s.st_mtime, s.st_size
if new_state != state:
update_state_dict[path] = new_state
events = [{'path': p, 'mask': IN_DELETE}
for p in set(state).difference(new_state)]
for p, m in new_state.iteritems():
if p in state:
if m == state[p]:
continue
mask = IN_MODIFY
else:
mask = IN_CREATE
events.append({'path': p, 'mask': mask})
getattr(notify, notify.getSenseMethodId())(events)
finally:
setSecurityManager(original_security_manager)
if update_state_dict:
TransactionalResource(tpc_finish=lambda txn:
inotify_state_dict.update(update_state_dict))
finally:
timerservice_lock.release()