82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
import os
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from platypush.backend import Backend
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from platypush.message.event.path import PathCreateEvent, PathDeleteEvent, \
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PathOpenEvent, PathModifyEvent, PathPermissionsChangeEvent, PathCloseEvent
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class InotifyBackend(Backend):
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"""
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(Linux only) This backend will listen for events on the filesystem (whether
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a file/directory on a watch list is opened, modified, created, deleted,
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closed or had its permissions changed) and will trigger a relevant event.
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Triggers:
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* :class:`platypush.message.event.path.PathCreateEvent` if a resource is created
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* :class:`platypush.message.event.path.PathOpenEvent` if a resource is opened
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* :class:`platypush.message.event.path.PathModifyEvent` if a resource is modified
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* :class:`platypush.message.event.path.PathPermissionsChangeEvent` if the permissions of a resource are changed
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* :class:`platypush.message.event.path.PathCloseEvent` if a resource is closed
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* :class:`platypush.message.event.path.PathDeleteEvent` if a resource is removed
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Requires:
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* **inotify** (``pip install inotify``)
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"""
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inotify_watch = None
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def __init__(self, watch_paths=[], **kwargs):
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"""
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:param watch_paths: Filesystem resources to watch for events
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:type watch_paths: str
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"""
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super().__init__(**kwargs)
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self.watch_paths = set(map(
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lambda path: os.path.abspath(os.path.expanduser(path)),
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watch_paths))
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def _cleanup(self):
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if not self.inotify_watch:
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return
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for path in self.watch_paths:
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self.inotify_watch.remove_watch(path)
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self.inotify_watch = None
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def run(self):
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import inotify.adapters
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super().run()
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self.inotify_watch = inotify.adapters.Inotify()
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for path in self.watch_paths:
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self.inotify_watch.add_watch(path)
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self.logger.info('Initialized inotify file monitoring backend, monitored resources: {}'
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.format(self.watch_paths))
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try:
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for inotify_event in self.inotify_watch.event_gen():
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if inotify_event is not None:
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(header, inotify_types, watch_path, filename) = inotify_event
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event = None
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if 'IN_OPEN' in inotify_types:
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event = PathOpenEvent(path=watch_path)
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elif 'IN_MODIFY' in inotify_types:
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event = PathModifyEvent(path=watch_path)
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elif 'IN_CLOSE_WRITE' in inotify_types or 'IN_CLOSE_NOWRITE' in inotify_types:
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event = PathCloseEvent(path=watch_path)
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if event:
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self.bus.post(event)
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finally:
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self._cleanup()
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# vim:sw=4:ts=4:et:
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