240 lines
8.8 KiB
Python
240 lines
8.8 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2014 Thomas Amland <thomas.amland@gmail.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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:module: watchdog.observers.fsevents2
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:synopsis: FSEvents based emitter implementation.
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:platforms: Mac OS X
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"""
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import os
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import logging
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import unicodedata
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from threading import Thread
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from ..utils.compat import queue
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from ..events import (
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FileDeletedEvent,
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FileModifiedEvent,
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FileCreatedEvent,
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FileMovedEvent,
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DirDeletedEvent,
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DirModifiedEvent,
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DirCreatedEvent,
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DirMovedEvent
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)
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from ..observers.api import (
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BaseObserver,
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EventEmitter,
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DEFAULT_EMITTER_TIMEOUT,
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DEFAULT_OBSERVER_TIMEOUT,
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)
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# pyobjc
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import AppKit
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from FSEvents import (
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FSEventStreamCreate,
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CFRunLoopGetCurrent,
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FSEventStreamScheduleWithRunLoop,
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FSEventStreamStart,
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CFRunLoopRun,
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CFRunLoopStop,
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FSEventStreamStop,
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FSEventStreamInvalidate,
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FSEventStreamRelease,
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)
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from FSEvents import (
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kCFAllocatorDefault,
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kCFRunLoopDefaultMode,
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kFSEventStreamEventIdSinceNow,
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kFSEventStreamCreateFlagNoDefer,
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kFSEventStreamCreateFlagFileEvents,
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kFSEventStreamEventFlagItemCreated,
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kFSEventStreamEventFlagItemRemoved,
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kFSEventStreamEventFlagItemInodeMetaMod,
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kFSEventStreamEventFlagItemRenamed,
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kFSEventStreamEventFlagItemModified,
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kFSEventStreamEventFlagItemFinderInfoMod,
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kFSEventStreamEventFlagItemChangeOwner,
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kFSEventStreamEventFlagItemXattrMod,
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kFSEventStreamEventFlagItemIsFile,
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kFSEventStreamEventFlagItemIsDir,
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kFSEventStreamEventFlagItemIsSymlink,
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)
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logger = logging.getLogger(__name__)
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class FSEventsQueue(Thread):
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""" Low level FSEvents client. """
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def __init__(self, path):
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Thread.__init__(self)
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self._queue = queue.Queue()
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self._run_loop = None
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if isinstance(path, bytes):
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path = path.decode('utf-8')
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self._path = unicodedata.normalize('NFC', path)
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context = None
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latency = 1.0
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self._stream_ref = FSEventStreamCreate(
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kCFAllocatorDefault, self._callback, context, [self._path],
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kFSEventStreamEventIdSinceNow, latency,
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kFSEventStreamCreateFlagNoDefer | kFSEventStreamCreateFlagFileEvents)
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if self._stream_ref is None:
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raise IOError("FSEvents. Could not create stream.")
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def run(self):
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pool = AppKit.NSAutoreleasePool.alloc().init()
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self._run_loop = CFRunLoopGetCurrent()
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FSEventStreamScheduleWithRunLoop(
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self._stream_ref, self._run_loop, kCFRunLoopDefaultMode)
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if not FSEventStreamStart(self._stream_ref):
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FSEventStreamInvalidate(self._stream_ref)
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FSEventStreamRelease(self._stream_ref)
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raise IOError("FSEvents. Could not start stream.")
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CFRunLoopRun()
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FSEventStreamStop(self._stream_ref)
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FSEventStreamInvalidate(self._stream_ref)
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FSEventStreamRelease(self._stream_ref)
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del pool
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# Make sure waiting thread is notified
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self._queue.put(None)
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def stop(self):
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if self._run_loop is not None:
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CFRunLoopStop(self._run_loop)
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def _callback(self, streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIDs):
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events = [NativeEvent(path, flags, _id) for path, flags, _id in
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zip(eventPaths, eventFlags, eventIDs)]
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logger.debug("FSEvents callback. Got %d events:" % numEvents)
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for e in events:
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logger.debug(e)
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self._queue.put(events)
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def read_events(self):
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"""
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Returns a list or one or more events, or None if there are no more
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events to be read.
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"""
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if not self.is_alive():
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return None
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return self._queue.get()
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class NativeEvent(object):
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def __init__(self, path, flags, event_id):
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self.path = path
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self.flags = flags
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self.event_id = event_id
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self.is_created = bool(flags & kFSEventStreamEventFlagItemCreated)
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self.is_removed = bool(flags & kFSEventStreamEventFlagItemRemoved)
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self.is_renamed = bool(flags & kFSEventStreamEventFlagItemRenamed)
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self.is_modified = bool(flags & kFSEventStreamEventFlagItemModified)
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self.is_change_owner = bool(flags & kFSEventStreamEventFlagItemChangeOwner)
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self.is_inode_meta_mod = bool(flags & kFSEventStreamEventFlagItemInodeMetaMod)
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self.is_finder_info_mod = bool(flags & kFSEventStreamEventFlagItemFinderInfoMod)
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self.is_xattr_mod = bool(flags & kFSEventStreamEventFlagItemXattrMod)
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self.is_symlink = bool(flags & kFSEventStreamEventFlagItemIsSymlink)
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self.is_directory = bool(flags & kFSEventStreamEventFlagItemIsDir)
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@property
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def _event_type(self):
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if self.is_created: return "Created"
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if self.is_removed: return "Removed"
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if self.is_renamed: return "Renamed"
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if self.is_modified: return "Modified"
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if self.is_inode_meta_mod: return "InodeMetaMod"
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if self.is_xattr_mod: return "XattrMod"
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return "Unknown"
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def __repr__(self):
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s ="<NativeEvent: path=%s, type=%s, is_dir=%s, flags=%s, id=%s>"
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return s % (repr(self.path), self._event_type, self.is_directory, hex(self.flags), self.event_id)
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class FSEventsEmitter(EventEmitter):
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"""
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FSEvents based event emitter. Handles conversion of native events.
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"""
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def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT):
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EventEmitter.__init__(self, event_queue, watch, timeout)
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self._fsevents = FSEventsQueue(watch.path)
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self._fsevents.start()
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def on_thread_stop(self):
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self._fsevents.stop()
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def queue_events(self, timeout):
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events = self._fsevents.read_events()
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if events is None:
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return
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i = 0
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while i < len(events):
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event = events[i]
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# For some reason the create and remove flags are sometimes also
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# set for rename and modify type events, so let those take
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# precedence.
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if event.is_renamed:
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# Internal moves appears to always be consecutive in the same
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# buffer and have IDs differ by exactly one (while others
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# don't) making it possible to pair up the two events coming
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# from a singe move operation. (None of this is documented!)
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# Otherwise, guess whether file was moved in or out.
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#TODO: handle id wrapping
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if (i+1 < len(events) and events[i+1].is_renamed and
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events[i+1].event_id == event.event_id + 1):
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cls = DirMovedEvent if event.is_directory else FileMovedEvent
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self.queue_event(cls(event.path, events[i+1].path))
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self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
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self.queue_event(DirModifiedEvent(os.path.dirname(events[i+1].path)))
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i += 1
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elif os.path.exists(event.path):
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cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
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self.queue_event(cls(event.path))
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self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
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else:
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cls = DirDeletedEvent if event.is_directory else FileDeletedEvent
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self.queue_event(cls(event.path))
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self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
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#TODO: generate events for tree
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elif event.is_modified or event.is_inode_meta_mod or event.is_xattr_mod :
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cls = DirModifiedEvent if event.is_directory else FileModifiedEvent
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self.queue_event(cls(event.path))
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elif event.is_created:
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cls = DirCreatedEvent if event.is_directory else FileCreatedEvent
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self.queue_event(cls(event.path))
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self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
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elif event.is_removed:
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cls = DirDeletedEvent if event.is_directory else FileDeletedEvent
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self.queue_event(cls(event.path))
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self.queue_event(DirModifiedEvent(os.path.dirname(event.path)))
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i += 1
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class FSEventsObserver2(BaseObserver):
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def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
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BaseObserver.__init__(self, emitter_class=FSEventsEmitter, timeout=timeout)
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