136 lines
5.1 KiB
Python
136 lines
5.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
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# Copyright 2012 Google, Inc.
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# Copyright 2014 Thomas Amland
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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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from __future__ import with_statement
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import ctypes
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import threading
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import os.path
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import time
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from ..events import (
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DirCreatedEvent,
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DirDeletedEvent,
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DirMovedEvent,
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DirModifiedEvent,
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FileCreatedEvent,
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FileDeletedEvent,
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FileMovedEvent,
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FileModifiedEvent,
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generate_sub_moved_events,
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generate_sub_created_events,
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)
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from ..observers.api import (
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EventEmitter,
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BaseObserver,
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DEFAULT_OBSERVER_TIMEOUT,
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DEFAULT_EMITTER_TIMEOUT
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)
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from ..observers.winapi import (
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read_events,
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get_directory_handle,
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close_directory_handle,
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)
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# HACK:
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WATCHDOG_TRAVERSE_MOVED_DIR_DELAY = 1 # seconds
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class WindowsApiEmitter(EventEmitter):
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"""
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Windows API-based emitter that uses ReadDirectoryChangesW
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to detect file system changes for a watch.
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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._lock = threading.Lock()
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self._handle = None
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def on_thread_start(self):
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self._handle = get_directory_handle(self.watch.path)
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def on_thread_stop(self):
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if self._handle:
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close_directory_handle(self._handle)
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def queue_events(self, timeout):
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winapi_events = read_events(self._handle, self.watch.is_recursive)
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with self._lock:
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last_renamed_src_path = ""
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for winapi_event in winapi_events:
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src_path = os.path.join(self.watch.path, winapi_event.src_path)
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if winapi_event.is_renamed_old:
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last_renamed_src_path = src_path
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elif winapi_event.is_renamed_new:
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dest_path = src_path
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src_path = last_renamed_src_path
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if os.path.isdir(dest_path):
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event = DirMovedEvent(src_path, dest_path)
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if self.watch.is_recursive:
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# HACK: We introduce a forced delay before
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# traversing the moved directory. This will read
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# only file movement that finishes within this
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# delay time.
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time.sleep(WATCHDOG_TRAVERSE_MOVED_DIR_DELAY)
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# The following block of code may not
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# obtain moved events for the entire tree if
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# the I/O is not completed within the above
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# delay time. So, it's not guaranteed to work.
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# TODO: Come up with a better solution, possibly
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# a way to wait for I/O to complete before
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# queuing events.
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for sub_moved_event in generate_sub_moved_events(src_path, dest_path):
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self.queue_event(sub_moved_event)
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self.queue_event(event)
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else:
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self.queue_event(FileMovedEvent(src_path, dest_path))
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elif winapi_event.is_modified:
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cls = DirModifiedEvent if os.path.isdir(src_path) else FileModifiedEvent
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self.queue_event(cls(src_path))
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elif winapi_event.is_added:
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isdir = os.path.isdir(src_path)
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cls = DirCreatedEvent if isdir else FileCreatedEvent
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self.queue_event(cls(src_path))
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if isdir:
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# If a directory is moved from outside the watched folder to inside it
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# we only get a created directory event out of it, not any events for its children
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# so use the same hack as for file moves to get the child events
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time.sleep(WATCHDOG_TRAVERSE_MOVED_DIR_DELAY)
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sub_events = generate_sub_created_events(src_path)
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for sub_created_event in sub_events:
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self.queue_event(sub_created_event)
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elif winapi_event.is_removed:
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self.queue_event(FileDeletedEvent(src_path))
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class WindowsApiObserver(BaseObserver):
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"""
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Observer thread that schedules watching directories and dispatches
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calls to event handlers.
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"""
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def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
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BaseObserver.__init__(self, emitter_class=WindowsApiEmitter,
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timeout=timeout)
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