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import os
import threading
import _fsevents
# inotify event flags
IN_MODIFY = 0x00000002
IN_ATTRIB = 0x00000004
IN_CREATE = 0x00000100
IN_DELETE = 0x00000200
IN_MOVED_FROM = 0x00000040
IN_MOVED_TO = 0x00000080
class Observer(threading.Thread):
event = None
runloop = None
def __init__(self):
self.streams = set()
self.schedulings = {}
self.lock = threading.Lock()
threading.Thread.__init__(self)
def run(self):
# wait until we have streams registered
while not self.streams:
self.event = threading.Event()
self.event.wait()
if self.event is None:
return
self.event = None
self.lock.acquire()
try:
# schedule all streams
for stream in self.streams:
self._schedule(stream)
self.streams = None
finally:
self.lock.release()
# start run-loop
_fsevents.loop(self)
def _schedule(self, stream):
if not stream.paths:
raise ValueError("No paths to observe.")
if stream.file_events:
callback = FileEventCallback(stream.callback, stream.paths)
else:
def callback(paths, masks):
for path, mask in zip(paths, masks):
stream.callback(path, mask)
_fsevents.schedule(self, stream, callback, stream.paths)
def schedule(self, stream):
if self.streams is None:
self._schedule(stream)
elif stream in self.streams:
raise ValueError("Stream already scheduled.")
else:
self.streams.add(stream)
if self.event is not None:
self.event.set()
if self.is_alive():
while self.streams is not None:
pass
def unschedule(self, stream):
self.lock.acquire()
try:
if self.streams is None:
_fsevents.unschedule(stream)
else:
self.streams.remove(stream)
finally:
self.lock.release()
def stop(self):
if self.event is None:
_fsevents.stop(self)
else:
event = self.event
self.event = None
event.set()
class Stream(object):
def __init__(self, callback, *paths, **options):
file_events = options.pop('file_events', False)
assert len(options) == 0, "Invalid option(s): %s" % repr(options.keys())
for path in paths:
if not isinstance(path, str):
raise TypeError(
"Path must be string, not '%s'." % type(path).__name__)
self.callback = callback
self.paths = list(paths)
self.file_events = file_events
class FileEvent(object):
__slots__ = 'mask', 'cookie', 'name'
def __init__(self, mask, cookie, name):
self.mask = mask
self.cookie = cookie
self.name = name
def __repr__(self):
return repr((self.mask, self.cookie, self.name))
class FileEventCallback(object):
def __init__(self, callback, paths):
self.snapshots = {}
for path in paths:
self.snapshot(path)
self.callback = callback
self.cookie = 0
def __call__(self, paths, masks):
events = []
deleted = {}
for path in sorted(paths):
path = path.rstrip('/')
snapshot = self.snapshots[path]
current = {}
try:
for name in os.listdir(path):
try:
current[name] = os.stat(os.path.join(path, name))
except OSError:
pass
except OSError:
# recursive delete causes problems with path being non-existent
pass
observed = set(current)
for name, snap_stat in snapshot.items():
filename = os.path.join(path, name)
if name in observed:
stat = current[name]
if stat.st_mtime > snap_stat.st_mtime:
events.append(FileEvent(IN_MODIFY, None, filename))
observed.discard(name)
else:
event = FileEvent(IN_DELETE, None, filename)
deleted[snap_stat.st_ino] = event
events.append(event)
for name in observed:
stat = current[name]
filename = os.path.join(path, name)
event = deleted.get(stat.st_ino)
if event is not None:
self.cookie += 1
event.mask = IN_MOVED_FROM
event.cookie = self.cookie
event = FileEvent(IN_MOVED_TO, self.cookie, filename)
else:
event = FileEvent(IN_CREATE, None, filename)
if os.path.isdir(filename):
self.snapshot(filename)
events.append(event)
snapshot.clear()
snapshot.update(current)
for event in events:
self.callback(event)
def snapshot(self, path):
path = os.path.realpath(path)
refs = self.snapshots
refs[path] = {}
for root, dirs, files in os.walk(path):
entry = refs[root]
for filename in files:
try:
entry[filename] = os.stat(os.path.join(root, filename))
except OSError:
continue
for directory in dirs:
refs[os.path.join(root, directory)] = {}
if os.path.isdir(path):
refs[os.path.join(root, path)] = {}
for name in os.listdir(os.path.join(root, path)):
try:
refs[path][name] = os.stat(os.path.join(path, name))
except OSError:
pass
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