import os from platypush.backend import Backend from platypush.message.event.inotify import InotifyCreateEvent, InotifyDeleteEvent, \ InotifyOpenEvent, InotifyModifyEvent, InotifyCloseEvent, InotifyAccessEvent, InotifyMovedEvent class InotifyBackend(Backend): """ (Linux only) This backend will listen for events on the filesystem (whether a file/directory on a watch list is opened, modified, created, deleted, closed or had its permissions changed) and will trigger a relevant event. Triggers: * :class:`platypush.message.event.inotify.InotifyCreateEvent` if a resource is created * :class:`platypush.message.event.inotify.InotifyAccessEvent` if a resource is accessed * :class:`platypush.message.event.inotify.InotifyOpenEvent` if a resource is opened * :class:`platypush.message.event.inotify.InotifyModifyEvent` if a resource is modified * :class:`platypush.message.event.inotify.InotifyPermissionsChangeEvent` if the permissions of a resource are changed * :class:`platypush.message.event.inotify.InotifyCloseEvent` if a resource is closed * :class:`platypush.message.event.inotify.InotifyDeleteEvent` if a resource is removed Requires: * **inotify** (``pip install inotify``) """ inotify_watch = None def __init__(self, watch_paths=None, **kwargs): """ :param watch_paths: Filesystem resources to watch for events :type watch_paths: str """ super().__init__(**kwargs) self.watch_paths = set(map( lambda path: os.path.abspath(os.path.expanduser(path)), watch_paths if watch_paths else [])) def _cleanup(self): if not self.inotify_watch: return for path in self.watch_paths: self.inotify_watch.remove_watch(path) self.inotify_watch = None def run(self): import inotify.adapters super().run() self.inotify_watch = inotify.adapters.Inotify() for path in self.watch_paths: self.inotify_watch.add_watch(path) moved_file = None self.logger.info('Initialized inotify file monitoring backend, monitored resources: {}' .format(self.watch_paths)) try: for inotify_event in self.inotify_watch.event_gen(): if inotify_event is not None: (header, inotify_types, watch_path, filename) = inotify_event event = None resource_type = inotify_types[1] if len(inotify_types) > 1 else None if moved_file: new = filename if 'IN_MOVED_TO' in inotify_types else None event = InotifyMovedEvent(path=watch_path, old=moved_file, new=new) moved_file = None if 'IN_OPEN' in inotify_types: event = InotifyOpenEvent(path=watch_path, resource=filename, resource_type=resource_type) elif 'IN_ACCESS' in inotify_types: event = InotifyAccessEvent(path=watch_path, resource=filename, resource_type=resource_type) elif 'IN_CREATE' in inotify_types: event = InotifyCreateEvent(path=watch_path, resource=filename, resource_type=resource_type) elif 'IN_MOVED_FROM' in inotify_types: moved_file = filename elif 'IN_MOVED_TO' in inotify_types and not moved_file: event = InotifyMovedEvent(path=watch_path, old=None, new=filename) elif 'IN_DELETE' in inotify_types: event = InotifyDeleteEvent(path=watch_path, resource=filename, resource_type=resource_type) elif 'IN_MODIFY' in inotify_types: event = InotifyModifyEvent(path=watch_path, resource=filename, resource_type=resource_type) elif 'IN_CLOSE_WRITE' in inotify_types or 'IN_CLOSE_NOWRITE' in inotify_types: event = InotifyCloseEvent(path=watch_path, resource=filename, resource_type=resource_type) if event: self.bus.post(event) finally: self._cleanup() # vim:sw=4:ts=4:et: