/usr/lib/python2.7/dist-packages/watchdog/observers/polling.py is in python-watchdog 0.8.3-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | #!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2011 Yesudeep Mangalapilly <yesudeep@gmail.com>
# Copyright 2012 Google, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
:module: watchdog.observers.polling
:synopsis: Polling emitter implementation.
:author: yesudeep@google.com (Yesudeep Mangalapilly)
Classes
-------
.. autoclass:: PollingObserver
:members:
:show-inheritance:
.. autoclass:: PollingObserverVFS
:members:
:show-inheritance:
:special-members:
"""
from __future__ import with_statement
import os
import threading
from functools import partial
from watchdog.utils import stat as default_stat
from watchdog.utils.dirsnapshot import DirectorySnapshot, DirectorySnapshotDiff
from watchdog.observers.api import (
EventEmitter,
BaseObserver,
DEFAULT_OBSERVER_TIMEOUT,
DEFAULT_EMITTER_TIMEOUT
)
from watchdog.events import (
DirMovedEvent,
DirDeletedEvent,
DirCreatedEvent,
DirModifiedEvent,
FileMovedEvent,
FileDeletedEvent,
FileCreatedEvent,
FileModifiedEvent
)
class PollingEmitter(EventEmitter):
"""
Platform-independent emitter that polls a directory to detect file
system changes.
"""
def __init__(self, event_queue, watch, timeout=DEFAULT_EMITTER_TIMEOUT,
stat=default_stat, listdir=os.listdir):
EventEmitter.__init__(self, event_queue, watch, timeout)
self._snapshot = None
self._lock = threading.Lock()
self._take_snapshot = lambda: DirectorySnapshot(
self.watch.path, self.watch.is_recursive, stat=stat, listdir=listdir)
def on_thread_start(self):
self._snapshot = self._take_snapshot()
def queue_events(self, timeout):
# We don't want to hit the disk continuously.
# timeout behaves like an interval for polling emitters.
if self.stopped_event.wait(timeout):
return
with self._lock:
if not self.should_keep_running():
return
# Get event diff between fresh snapshot and previous snapshot.
# Update snapshot.
new_snapshot = self._take_snapshot()
events = DirectorySnapshotDiff(self._snapshot, new_snapshot)
self._snapshot = new_snapshot
# Files.
for src_path in events.files_deleted:
self.queue_event(FileDeletedEvent(src_path))
for src_path in events.files_modified:
self.queue_event(FileModifiedEvent(src_path))
for src_path in events.files_created:
self.queue_event(FileCreatedEvent(src_path))
for src_path, dest_path in events.files_moved:
self.queue_event(FileMovedEvent(src_path, dest_path))
# Directories.
for src_path in events.dirs_deleted:
self.queue_event(DirDeletedEvent(src_path))
for src_path in events.dirs_modified:
self.queue_event(DirModifiedEvent(src_path))
for src_path in events.dirs_created:
self.queue_event(DirCreatedEvent(src_path))
for src_path, dest_path in events.dirs_moved:
self.queue_event(DirMovedEvent(src_path, dest_path))
class PollingObserver(BaseObserver):
"""
Platform-independent observer that polls a directory to detect file
system changes.
"""
def __init__(self, timeout=DEFAULT_OBSERVER_TIMEOUT):
BaseObserver.__init__(self, emitter_class=PollingEmitter, timeout=timeout)
class PollingObserverVFS(BaseObserver):
"""
File system independent observer that polls a directory to detect changes.
"""
def __init__(self, stat, listdir, polling_interval=1):
"""
:param stat: stat function. See ``os.stat`` for details.
:param listdir: listdir function. See ``os.listdir`` for details.
:type polling_interval: float
:param polling_interval: interval in seconds between polling the file system.
"""
emitter_cls = partial(PollingEmitter, stat=stat, listdir=listdir)
BaseObserver.__init__(self, emitter_class=emitter_cls, timeout=polling_interval)
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