def process_default(self, event):
global FilesActionMap
global logger
# sanity check
if event.mask not in InotifyMask:
logger.warn('Got unexpected/unhandled event %d. Ignoring.' %
event.mask)
return
# map and process individual actions
FilesActionMap = read_atomic(FILES_STATUS_FILE)
action = InotifyMask[event.mask]
FilesActionMap[event.pathname] = (action, time.time())
write_atomic(FILES_STATUS_FILE, FilesActionMap)
logger.debug('Pending monitor actions %s.' % FilesActionMap)
def check_updated(poporig):
"""Check if sync queue has been updated in meantime. Returns True if
yes, False otherwise.
"""
global FilesSyncQueue
global logger
FilesSyncQueue = read_atomic(FILES_SYNC_FILE)
popnew = FilesSyncQueue.popleft()
if poporig == popnew:
write_atomic(FILES_SYNC_FILE, FilesSyncQueue)
else:
logger.warn('Oops, left side of file sync queue %s has changed. '
'This should never happen.' % FilesSyncQueue)
return True
return False
def check_updated(monitor_action, monitor_timestamp, myfile):
"""Check if action map has been updated in the meantime. Returns True
if yes, False otherwise.
"""
global FilesActionMap
global logger
# reread status and check if there are newer changes
FilesActionMap = read_atomic(FILES_STATUS_FILE)
_, monitor_timestampnew = FilesActionMap[myfile]
if monitor_timestampnew == monitor_timestamp:
# remove from action map if there are no changes
del FilesActionMap[myfile]
write_atomic(FILES_STATUS_FILE, FilesActionMap)
else:
return True
return False
def main(argv):
global FilesSyncQueue
global logger
global foreground
# parse argv
parse_argv(argv, globals())
# daemonize
daemonize(SYNCER_PID, foreground)
# initialize logging
logger = setup_logging(argv[0], CONSOLE_LOG_LEVEL, FILE_LOG_LEVEL,
LOG_FORMAT, SYNCER_LOG, DATE_FORMAT)
# sanity check
if not os.path.isdir(WATCH_DIR):
logger.critical('Watched directory %s does not exist. '
'Bailing out.' % WATCH_DIR)
sys.exit(1)
# if FilesSyncQueue is nonexistant or damaged, truncate it
try:
FilesSyncQueue = read_atomic(FILES_SYNC_FILE)
except (IOError, AttributeError, EOFError):
logger.warn('Unusable file sync queue file %s. Recreating.' %
FILES_SYNC_FILE)
pass
write_atomic(FILES_SYNC_FILE, FilesSyncQueue)
# start main loop
logger.debug('File sync service starting... Entering wait loop.')
while True:
while decisionlogic():
pass
time.sleep(SLEEP_TIME)
def decisionlogic():
"""Main decision/summing loop. Returns False if no more actions
to perform.
"""
global FilesActionMap
global FilesHashMap
global FilesSyncQueue
global logger
# reread fresh status on every run
FilesActionMap = read_atomic(FILES_STATUS_FILE)
# ignore if no actions pending
if len(FilesActionMap.keys()) == 0:
return False
# random choice to avoid checksumming the same file over and over if
# it changes often
myfile = random.choice(FilesActionMap.keys())
monitor_action, monitor_timestamp = FilesActionMap[myfile]
# by default don't resync nor remote remove files
sync_action = None
myperm = None
# file is freshly created or changed
if monitor_action == 'changed' or monitor_action == 'created' or \
monitor_action == 'attrib':
# calculate checksum
try:
mysha1sum = sha1sum(myfile)
except (IOError, OSError):
logger.info('Could not checksum file %s. Ignoring.' % myfile)
check_updated(None, monitor_timestamp, myfile)
return True
# get permissions
try:
myperm = oct(stat.S_IMODE(os.stat(myfile)[stat.ST_MODE]))
except (IOError, OSError):
logger.info('Could not get permissions for file %s. Ignoring.'
% myfile)
check_updated(None, monitor_timestamp, myfile)
return True
# already known file
if myfile in FilesHashMap:
mysha1sumold, mypermold = FilesHashMap[myfile]
# if checksum is different, resync is mandatory
if mysha1sumold != mysha1sum:
sync_action = 'sync'
# else if just mode changed, change remote mode
elif myperm != mypermold:
sync_action = 'change_perm'
# first time seen file (no checksum and no mode)
else:
sync_action = 'sync'
FilesHashMap[myfile] = mysha1sum, myperm
# deleted file
elif monitor_action == 'deleted':
if myfile in FilesHashMap:
del FilesHashMap[myfile]
sync_action = 'remove'
# created directory
elif monitor_action == 'created_dir':
try:
myperm = oct(stat.S_IMODE(os.stat(myfile)[stat.ST_MODE]))
except (IOError, OSError):
logger.info('Could not get permissions for directory %s. '
'Ignoring.' % myfile)
check_updated(None, monitor_timestamp, myfile)
return True
sync_action = 'make_dir'
# deleted directory
elif monitor_action == 'deleted_dir':
sync_action = 'remove_dir'
# permissions change for directory
elif monitor_action == 'attrib_dir':
# get permissions
try:
myperm = oct(stat.S_IMODE(os.stat(myfile)[stat.ST_MODE]))
except (IOError, OSError):
logger.info('Could not get permissions for directory %s. '
'Ignoring.' % myfile)
check_updated(None, monitor_timestamp, myfile)
return True
sync_action = 'change_perm'
# write hash file..
write_atomic(FILES_HASH_FILE, FilesHashMap)
logger.debug('Hash file status: %s.' % FilesHashMap)
# check if file/directory has been updated in the meantime
check_updated(sync_action, monitor_timestamp, myfile)
# resync or remove remote files
logger.debug('Pending action %s for file %s.' % (sync_action, myfile))
if sync_action:
FilesSyncQueue = read_atomic(FILES_SYNC_FILE)
FilesSyncQueue.append((myfile, sync_action, myperm))
write_atomic(FILES_SYNC_FILE, FilesSyncQueue)
logger.debug('Pending sync queue: %s.' % FilesSyncQueue)
return True
def main(argv):
global FilesActionMap
global FilesHashMap
global FilesSyncQueue
global logger
global foreground
# parse argv
parse_argv(argv, globals())
# daemonize
daemonize(SUMMER_PID, foreground)
# initialize logging
logger = setup_logging(argv[0], CONSOLE_LOG_LEVEL, FILE_LOG_LEVEL,
LOG_FORMAT, SUMMER_LOG, DATE_FORMAT)
# sanity check
if not os.path.isdir(WATCH_DIR):
logger.critical('Watched directory %s does not exist. '
'Bailing out.' % WATCH_DIR)
sys.exit(1)
# if FilesActionMap is nonexistant or damaged, truncate it
try:
FilesActionMap = read_atomic(FILES_STATUS_FILE)
except (IOError, AttributeError, EOFError):
logger.warn('Unusable action map status file %s. Recreating.' %
FILES_STATUS_FILE)
pass
write_atomic(FILES_STATUS_FILE, FilesActionMap)
# if FilesHashMap is nonexistant or damaged, truncate it
try:
FilesHashMap = read_atomic(FILES_HASH_FILE)
except (IOError, AttributeError, EOFError):
logger.warn('Unusable hash map file %s. Recreating.' %
FILES_HASH_FILE)
pass
write_atomic(FILES_HASH_FILE, FilesHashMap)
# if FilesSyncQueue is nonexistant or damaged, truncate it
try:
FilesSyncQueue = read_atomic(FILES_SYNC_FILE)
except (IOError, AttributeError, EOFError):
logger.warn('Unusable sync queue file %s. Recreating.' %
FILES_SYNC_FILE)
pass
write_atomic(FILES_SYNC_FILE, FilesSyncQueue)
# clear non-existant files from checksum map, most probably due to
# changes when monitor was inactive
for path in FilesHashMap.keys():
if not os.path.exists(path):
logger.warn('File %s is in hash map, but not on disk. '
'Deleting from map and trying to delete remotely.' %
path)
# remove from hash file
FilesHashMap = read_atomic(FILES_HASH_FILE)
del FilesHashMap[path]
write_atomic(FILES_HASH_FILE, FilesHashMap)
# enqueue to remove remotely
FilesSyncQueue = read_atomic(FILES_SYNC_FILE)
FilesSyncQueue.append((path, 'remove', 0))
write_atomic(FILES_SYNC_FILE, FilesSyncQueue)
# start main loop
logger.debug('Checksumming service starting... Entering wait loop.')
while True:
while decisionlogic():
pass
time.sleep(SLEEP_TIME)
def main(argv):
global FilesActionMap
global logger
global foreground
# parse argv
parse_argv(argv, globals())
# daemonize
daemonize(MONITOR_PID, foreground)
# initialize logging
logger = setup_logging(argv[0], CONSOLE_LOG_LEVEL, FILE_LOG_LEVEL,
LOG_FORMAT, MONITOR_LOG, DATE_FORMAT)
# sanity check
if not os.path.isdir(WATCH_DIR):
logger.critical('Watched directory %s does not exist. '
'Bailing out.' % WATCH_DIR)
sys.exit(1)
# if FilesActionMap is nonexistant or damaged, truncate it
try:
FilesActionMap = read_atomic(FILES_STATUS_FILE)
except (IOError, AttributeError, EOFError):
logger.warn('Unusable action map status file %s. Recreating.' %
FILES_STATUS_FILE)
pass
write_atomic(FILES_STATUS_FILE, FilesActionMap)
# initial recursive walk (initial events)
for root, dirs, files in os.walk(WATCH_DIR):
for name in files:
path = os.path.join(root, name)
FilesActionMap[path] = ('created', time.time())
for name in dirs:
path = os.path.join(root, name)
FilesActionMap[path] = ('created_dir', time.time())
write_atomic(FILES_STATUS_FILE, FilesActionMap)
logger.debug('Initial events %s. Commiting.' % FilesActionMap)
# start inotify monitor
watch_manager = pyinotify.WatchManager()
handler = ProcessEventHandler()
notifier = pyinotify.Notifier(watch_manager, default_proc_fun=handler,
read_freq=SLEEP_TIME)
# try coalescing events if possible
try:
notifier.coalesce_events()
logger.debug('Successfuly enabled events coalescing. Good.')
except AttributeError:
pass
# catch only create/delete/modify/attrib events; don't monitor
# IN_MODIFY, instead use IN_CLOSE_WRITE when file has been written to
# and finally closed; and monitor IN_MOVED_TO when using temporary
# files for atomicity as well as IN_MOVED_FROM when file is moved from
# watched path
event_mask = pyinotify.IN_CREATE|pyinotify.IN_DELETE|\
pyinotify.IN_CLOSE_WRITE|pyinotify.IN_ATTRIB|\
pyinotify.IN_MOVED_TO|pyinotify.IN_MOVED_FROM|\
pyinotify.IN_ISDIR|pyinotify.IN_UNMOUNT|\
pyinotify.IN_Q_OVERFLOW
watch_manager.add_watch(WATCH_DIR, event_mask, rec=True,
auto_add=True)
# enter loop
logger.debug('Inotify handler starting... Entering notify loop.')
notifier.loop()
