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from __future__ import print_function, division, absolute_import
# Copyright (c) 2018 Red Hat, Inc.
#
# This software is licensed to you under the GNU General Public License,
# version 2 (GPLv2). There is NO WARRANTY for this software, express or
# implied, including the implied warranties of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
# along with this software; if not, see
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
#
# Red Hat trademarks are not licensed under GPLv2. No permission is
# granted to use or replicate Red Hat trademarks that are incorporated
# in this software or its documentation.
from rhsm.config import initConfig
from rhsmlib.services import config
from six.moves import configparser
import logging
import os.path
import fnmatch
import time
try:
import pyinotify
except ImportError:
pyinotify = None
log = logging.getLogger(__name__)
conf = config.Config(initConfig())
class FilesystemWatcher(object):
"""
Watches a set of directories and notifies when there are changes
Polling implementation
Calls callbacks associated with directory when the directory changes
Uses a loop running in its own thread
** Use create_filesystem_watcher to create an instance of a filesystem_watcher
"""
def __init__(self, dir_watches):
"""
:param dir_watches: list of directories to watch (see DirectoryWatch class below)
"""
self.dir_watches = set(dir_watches)
self.should_stop = False
def stop(self):
self.should_stop = True
def update(self):
"""
calls all callbacks in dir watches that have changed according to mtime
:return: set of dir watches that have changed, for testing purposes
"""
changed_dir_watches = self.changed_dw_set()
for dir_watch in changed_dir_watches:
dir_watch.notify()
return changed_dir_watches # returned a value for testing purposes (test_file_monitor.py)
def get_mtime(self, dw):
"""
:param dw: directory watch we are looking at
:return: timestamp of directory watch we are looking at
"""
try:
timestamp = os.path.getmtime("%s" % dw.path)
except OSError:
timestamp = None
return timestamp
def changed_dw_set(self):
"""
checks which dir watches out of dir watch list have changed according to mtime of path,
updates dir watch timestamp if changed
:return: set of changed dir watches
"""
changed_dws = set()
for dir_watch in self.dir_watches:
timestamp = self.get_mtime(dir_watch)
if dir_watch.timestamp != timestamp:
changed_dws.add(dir_watch)
dir_watch.timestamp = timestamp
return changed_dws
def loop(self, user_end_loop_cb=None):
"""
Loops while self.should_stop is false and the callback() is not true
Initializes timestamps for each dir watch in dir watch list, sets callback,
notifies dir watch if it has changed
:param user_end_loop_cb: callback function to be called at end of each iteration of the loop
:return:
"""
for dw in self.dir_watches:
dw.timestamp = self.get_mtime(dw)
while not end_loop_cb(self, user_callback=user_end_loop_cb):
self.update()
time.sleep(2.0)
self.stop()
class InotifyFilesystemWatcher(FilesystemWatcher):
"""
Watches a set of directories and notifies when there are changes
Inotify implementation
Calls callbacks associated with directory when the directory changes
Uses a loop running in its own thread
** Use create_filesystem_watcher to create instance of filesystem watcher
"""
def __init__(self, dir_watches):
"""
Filesystem watcher if pyinotify is configured and available
loop function will override parent class loop function
:param dir_watches: list of directories to watch (see DirectoryWatch class below)
"""
super(InotifyFilesystemWatcher, self).__init__(dir_watches)
self.watch_manager = None
self.notifier = None
def loop(self, callback=None):
"""
sets up watch manager, notifier, adds watches to watch manager, and starts loop
:param callback: callback method to be called at the end of each iteration of the loop
:return:
"""
self.watch_manager = pyinotify.WatchManager()
self.notifier = pyinotify.Notifier(self.watch_manager, self.handle_event)
self.add_watches()
def inotify_callback():
return end_loop_cb(self, user_callback=callback)
while not inotify_callback():
self.notifier.process_events()
if self.notifier.check_events(500): # keeps tests reasonably fast while still timing out
self.notifier.read_events()
def handle_event(self, event):
"""
default process function for pyinotify notifier
:param event: pyinotify Event object, has path and mask of flags representing file modification
:return:
"""
for dir_watch in self.dir_watches:
if dir_watch.paths_match(event.path, event.pathname) and dir_watch.file_modified(event.mask):
dir_watch.notify()
def add_watches(self):
"""
adds watches to the watch manager
:return:
"""
for dir_watch in self.dir_watches:
if dir_watch.is_file:
# watch for any changes in the directory, but only be notified of the specific path
dir_name = os.path.abspath(os.path.dirname(dir_watch.path))
self.watch_manager.add_watch(dir_name, dir_watch.mask, self.handle_event, do_glob=dir_watch.is_glob)
else:
# is already directory
self.watch_manager.add_watch(dir_watch.path, dir_watch.mask, self.handle_event, do_glob=dir_watch.is_glob)
class DirectoryWatch(object):
"""
Directory to be watched
Included in list to be passed into filesystem watcher object
Example usage:
directory_watch = DirectoryWatch("~/home/", [my_function1, my_function2])
"""
def __init__(self, path, callbacks, is_glob=False):
"""
:param path: path associated with directory to be watched
:param callbacks: list of methods called when directory is changed
:param is_glob: bool - if path provided is glob or not
"""
self.IN_DELETE = 0x00000200
self.IN_MODIFY = 0x00000002
self.IN_MOVED_TO = 0x00000080
self.path = os.path.abspath(path)
self.is_file = not os.path.isdir(self.path) # used isdir because if path does not exist, assumed to be file
self.timestamp = None
self.is_glob = is_glob
self.callbacks = callbacks
self.mask = self.IN_DELETE | self.IN_MODIFY | self.IN_MOVED_TO
def notify(self):
"""
calls all callbacks associated with dir watch
:return:
"""
for cb in self.callbacks:
if cb is not None:
try:
cb()
except Exception as e:
log.exception(e)
def paths_match(self, event_path, event_pathname):
"""
checks if event path matches any of the dir watch paths associated to it
:param event_path: path of the inotify event object
:param event_pathname: pathname of the inotify event object
see pyinotify event class for more info
:return: bool - if paths match or not
"""
event_pathname = os.path.realpath(event_pathname)
event_path = os.path.realpath(event_path)
if self.is_file:
# we do not care about events on other paths, like .swp files
return fnmatch.fnmatchcase(event_pathname, self.path)
return fnmatch.fnmatchcase(event_path, self.path)
def file_modified(self, event_mask):
"""
checks if any flag has been set by event corresponding to modification
:param event_mask: mask of the inotify event object, signifies what happened
:return: bool - if any of the modification flags have been set
"""
return bool(self.mask & event_mask)
def end_loop_cb(fsw, user_callback=None):
if user_callback is not None:
try:
return user_callback() or fsw.should_stop
except Exception as e:
log.exception(e)
return fsw.should_stop
def create_filesystem_watcher(dir_watches):
"""
determines if inotify is available and configured in rhsm.conf
If yes, uses pyinotify. Else, uses polling methods.
Uses inotify by default
:param dir_watches: list of directories to watch to create
correct filesystem watcher object
:return: correct filesystem watcher object
Example usage:
filesystem_watcher = create_filesystem_watcher([directory_watch1, directory_watch2])
thread = threading.Thread(target=filesystem_watcher.loop)
thread.start()
"""
available = is_inotify_available()
configed = is_inotify_config()
if not (available and configed):
return FilesystemWatcher(dir_watches)
else:
return InotifyFilesystemWatcher(dir_watches)
def is_inotify_available():
return pyinotify is not None
def is_inotify_config():
"""
Check if inotify is enabled or disabled in rhsm.conf.
It is enabled by default.
:return: It returns True, when inotify is enabled. Otherwise it returns False.
"""
try:
use_inotify = conf['rhsm'].get_int('inotify')
except ValueError as e:
log.exception(e)
return True
except configparser.Error as e:
log.exception(e)
return True
else:
if use_inotify is None:
return True
return bool(use_inotify)