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fsevents_observer.py
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fsevents_observer.py
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# -*- coding: utf-8 -*-
import _fsevents
from threading import Thread, Event as ThreadedEvent
from os.path import realpath, abspath, sep as path_separator
from decorator_utils import synchronized
from dirsnapshot import DirectorySnapshot
from events import DirMovedEvent, DirDeletedEvent, DirCreatedEvent, DirModifiedEvent, \
FileMovedEvent, FileDeletedEvent, FileCreatedEvent, FileModifiedEvent
class _Stream(object):
"""Stream object that acts as a conduit for the _fsevents module API."""
def __init__(self, name, event_handler, *paths):
for path in paths:
if not isinstance(path, str):
raise TypeError(
"Path must be string, not '%s'." % type(path).__name__)
self.event_handler = event_handler
self.paths = [realpath(abspath(path)) for path in set(paths)]
self.name = name
def __repr__(self):
return self.name
def __str__(self):
return self.__repr__()
class FSEventsObserver(Thread):
event = None
def __init__(self, *args, **kwargs):
self.streams = set()
self.map_name_to_stream = {}
self.snapshot_for_path = {}
Thread.__init__(self)
def run(self):
self._wait_until_stream_registered()
self._schedule_all_streams()
_fsevents.loop(self)
def _wait_until_stream_registered(self):
"""Blocks until a stream is registered."""
while not self.streams:
self.event = ThreadedEvent()
self.event.wait()
if self.event is None:
return
self.event = None
@synchronized()
def _get_directory_snapshot_diff(self, path):
"""Obtains a diff of two directory snapshots."""
# Strip the path of the ending separator to ensure consistent keys
# in the self.snapshot_for_path dictionary.
path = path.rstrip(path_separator)
snapshot = self.snapshot_for_path[path]
new_snapshot = DirectorySnapshot(path)
self.snapshot_for_path[path] = new_snapshot
return new_snapshot - snapshot
@synchronized()
def _dispatch_events_for_path(self, event_handler, path):
diff = self._get_directory_snapshot_diff(path)
if diff:
for path in diff.files_deleted:
event_handler.dispatch(FileDeletedEvent(path))
for path in diff.files_modified:
event_handler.dispatch(FileModifiedEvent(path))
for path in diff.files_created:
event_handler.dispatch(FileCreatedEvent(path))
for path, new_path in diff.files_moved.items():
event_handler.dispatch(FileMovedEvent(path, new_path))
for path in diff.dirs_modified:
event_handler.dispatch(DirModifiedEvent(path))
for path in diff.dirs_deleted:
event_handler.dispatch(DirDeletedEvent(path))
for path in diff.dirs_created:
event_handler.dispatch(DirCreatedEvent(path))
for path, new_path in diff.dirs_moved.items():
event_handler.dispatch(DirMovedEvent(path, new_path))
def _schedule_and_set_callback(self, stream):
if not stream.paths:
raise ValueError("No paths to observe.")
for path in stream.paths:
# Strip the path of the ending separator to ensure consistent keys
# in the self.snapshot_for_path dictionary.
path = path.rstrip(path_separator)
self.snapshot_for_path[path] = DirectorySnapshot(path)
def callback(paths, masks):
for path in paths:
self._dispatch_events_for_path(stream.event_handler, path)
_fsevents.schedule(self, stream, callback, stream.paths)
@synchronized()
def _schedule_all_streams(self):
for stream in self.streams:
self._schedule_and_set_callback(stream)
self.streams = None
@synchronized()
def _schedule_stream(self, stream):
if self.streams is None:
self._schedule_and_set_callback(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()
@synchronized()
def _unschedule_stream(self, stream):
if self.streams is None:
_fsevents.unschedule(stream)
else:
self.streams.remove(stream)
@synchronized()
def schedule(self, name, event_handler, *paths):
s = _Stream(name, event_handler, *paths)
self.map_name_to_stream[name] = s
self._schedule_stream(s)
@synchronized()
def unschedule(self, *names):
for name in names:
if name in self.map_name_to_stream:
s = self.map_name_to_stream[name]
self._unschedule_stream(s)
#for path in s.paths:
# del self.snapshot_for_path[path]
del self.map_name_to_stream[name]
def stop(self):
if self.event is None:
_fsevents.stop(self)
else:
event = self.event
self.event = None
event.set()
if __name__ == '__main__':
import sys
import time
from events import FileSystemEventHandler
event_handler = FileSystemEventHandler()
o = FSEventsObserver()
o.schedule('arguments', event_handler, *sys.argv[1:])
o.start()
try:
while True:
time.sleep(1)
except KeyboardInterrupt:
o.unschedule('arguments')
o.stop()
raise
o.join()