302 lines
10 KiB
Python
302 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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import os
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import abc
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import re
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import media.monitor.pure as mmp
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import media.monitor.owners as owners
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from media.monitor.pure import LazyProperty
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from media.monitor.metadata import Metadata
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from media.monitor.log import Loggable
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from media.monitor.exceptions import BadSongFile
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class PathChannel(object):
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"""
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Simple struct to hold a 'signal' string and a related 'path'. Basically
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used as a named tuple
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"""
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def __init__(self, signal, path):
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self.signal = signal
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self.path = path
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# TODO : Move this to it's file. Also possible unsingleton and use it as a
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# simple module just like m.m.owners
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class EventRegistry(object):
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"""
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This class's main use is to keep track all events with a cookie attribute.
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This is done mainly because some events must be 'morphed' into other events
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because we later detect that they are move events instead of delete events.
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"""
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registry = {}
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@staticmethod
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def register(evt): EventRegistry.registry[evt.cookie] = evt
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@staticmethod
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def unregister(evt): del EventRegistry.registry[evt.cookie]
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@staticmethod
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def registered(evt): return evt.cookie in EventRegistry.registry
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@staticmethod
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def matching(evt):
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event = EventRegistry.registry[evt.cookie]
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# Want to disallow accessing the same event twice
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EventRegistry.unregister(event)
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return event
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def __init__(self,*args,**kwargs):
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raise Exception("You can instantiate this class. Must only use class \
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methods")
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class EventProxy(Loggable):
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"""
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A container object for instances of BaseEvent (or it's subclasses) used for
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event contractor
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"""
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def __init__(self, orig_evt):
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self.orig_evt = orig_evt
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self.evt = orig_evt
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self.reset_hook()
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if hasattr(orig_evt, 'path'): self.path = orig_evt.path
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def set_pack_hook(self, l):
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self._pack_hook = l
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def reset_hook(self):
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self._pack_hook = lambda : None
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def run_hook(self):
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self._pack_hook()
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def safe_pack(self):
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self.run_hook()
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# make sure that cleanup hook is never called twice for the same event
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self.reset_hook()
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return self.evt.safe_pack()
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def merge_proxy(self, proxy):
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self.evt = proxy.evt
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def is_event(self, real_event):
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return isinstance(self.evt, real_event)
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def same_event(self, proxy):
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return self.evt.__class__ == proxy.evt.__class__
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class HasMetaData(object):
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"""
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Any class that inherits from this class gains the metadata attribute that
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loads metadata from the class's 'path' attribute. This is done lazily so
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there is no performance penalty to inheriting from this and subsequent
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calls to metadata are cached
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"""
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__metaclass__ = abc.ABCMeta
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@LazyProperty
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def metadata(self): return Metadata(self.path)
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class BaseEvent(Loggable):
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__metaclass__ = abc.ABCMeta
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def __init__(self, raw_event):
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# TODO : clean up this idiotic hack
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# we should use keyword constructors instead of this behaviour checking
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# bs to initialize BaseEvent
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if hasattr(raw_event,"pathname"):
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self._raw_event = raw_event
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self.path = os.path.normpath(raw_event.pathname)
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else: self.path = raw_event
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self.owner = owners.get_owner(self.path)
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owner_re = re.search('stor/imported/(?P<owner>\d+)/', self.path)
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if owner_re:
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self.logger.info("matched path: %s" % self.path)
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self.owner = owner_re.group('owner')
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else:
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self.logger.info("did not match path: %s" % self.path)
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self._pack_hook = lambda: None # no op
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# into another event
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# TODO : delete this method later
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def reset_hook(self):
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"""
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Resets the hook that is called after an event is packed. Before
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resetting the hook we execute it to make sure that whatever cleanup
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operations were queued are executed.
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"""
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self._pack_hook()
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self._pack_hook = lambda: None
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def exists(self): return os.path.exists(self.path)
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@LazyProperty
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def cookie(self): return getattr( self._raw_event, 'cookie', None )
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def __str__(self):
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return "Event(%s). Path(%s)" % ( self.path, self.__class__.__name__)
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# TODO : delete this method later
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def add_safe_pack_hook(self,k):
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"""
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adds a callable object (function) that will be called after the event
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has been "safe_packed"
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"""
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self._pack_hook = k
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def proxify(self):
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return EventProxy(self)
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# As opposed to unsafe_pack...
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def safe_pack(self):
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"""
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returns exceptions instead of throwing them to be consistent with
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events that must catch their own BadSongFile exceptions since generate
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a set of exceptions instead of a single one
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"""
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try:
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self._pack_hook()
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ret = self.pack()
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# Remove owner of this file only after packing. Otherwise packing
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# will not serialize the owner correctly into the airtime request
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owners.remove_file_owner(self.path)
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return ret
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except BadSongFile as e: return [e]
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except Exception as e:
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self.unexpected_exception(e)
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return[e]
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# nothing to see here, please move along
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def morph_into(self, evt):
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self.logger.info("Morphing %s into %s" % ( str(self), str(evt) ) )
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self._raw_event = evt._raw_event
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self.path = evt.path
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self.__class__ = evt.__class__
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# Clean up old hook and transfer the new events hook
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self.reset_hook()
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self.add_safe_pack_hook( evt._pack_hook )
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return self
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def assign_owner(self,req):
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"""
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Packs self.owner to req if the owner is valid. I.e. it's not -1. This
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method is used by various events that would like to pass owner as a
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parameter. NewFile for example.
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"""
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if self.owner != -1: req['MDATA_KEY_OWNER_ID'] = self.owner
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class FakePyinotify(object):
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"""
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sometimes we must create our own pyinotify like objects to
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instantiate objects from the classes below whenever we want to turn
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a single event into multiple events
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"""
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def __init__(self, path): self.pathname = path
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class OrganizeFile(BaseEvent, HasMetaData):
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"""
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The only kind of event that does support the pack protocol. It's used
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internally with mediamonitor to move files in the organize directory.
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"""
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def __init__(self, *args, **kwargs):
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super(OrganizeFile, self).__init__(*args, **kwargs)
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def pack(self):
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raise AttributeError("You can't send organize events to airtime!!!")
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class NewFile(BaseEvent, HasMetaData):
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"""
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NewFile events are the only events that contain MDATA_KEY_OWNER_ID metadata
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in them.
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"""
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def __init__(self, *args, **kwargs):
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super(NewFile, self).__init__(*args, **kwargs)
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def pack(self):
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"""
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packs turns an event into a media monitor request
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"""
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req_dict = self.metadata.extract()
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req_dict['mode'] = u'create'
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req_dict['is_record'] = self.metadata.is_recorded()
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self.assign_owner(req_dict)
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req_dict['MDATA_KEY_FILEPATH'] = unicode( self.path )
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return [req_dict]
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class DeleteFile(BaseEvent):
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"""
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DeleteFile event only contains the path to be deleted. No other metadata
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can be or is included. (This is because this event is fired after the
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deletion occurs).
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"""
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def __init__(self, *args, **kwargs):
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super(DeleteFile, self).__init__(*args, **kwargs)
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def pack(self):
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req_dict = {}
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req_dict['mode'] = u'delete'
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req_dict['MDATA_KEY_FILEPATH'] = unicode( self.path )
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return [req_dict]
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class MoveFile(BaseEvent, HasMetaData):
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"""
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Path argument should be the new path of the file that was moved
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"""
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def __init__(self, *args, **kwargs):
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super(MoveFile, self).__init__(*args, **kwargs)
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def old_path(self):
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return self._raw_event.src_pathname
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def pack(self):
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req_dict = {}
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req_dict['mode'] = u'moved'
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req_dict['MDATA_KEY_ORIGINAL_PATH'] = self.old_path()
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req_dict['MDATA_KEY_FILEPATH'] = unicode( self.path )
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req_dict['MDATA_KEY_MD5'] = self.metadata.extract()['MDATA_KEY_MD5']
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return [req_dict]
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class ModifyFile(BaseEvent, HasMetaData):
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def __init__(self, *args, **kwargs):
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super(ModifyFile, self).__init__(*args, **kwargs)
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def pack(self):
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req_dict = self.metadata.extract()
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req_dict['mode'] = u'modify'
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# path to directory that is to be removed
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req_dict['MDATA_KEY_FILEPATH'] = unicode( self.path )
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return [req_dict]
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def map_events(directory, constructor):
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"""
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Walks 'directory' and creates an event using 'constructor'. Returns a list
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of the constructed events.
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"""
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# -unknown-path should not appear in the path here but more testing
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# might be necessary
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for f in mmp.walk_supported(directory, clean_empties=False):
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try:
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for e in constructor( FakePyinotify(f) ).pack(): yield e
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except BadSongFile as e: yield e
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class DeleteDir(BaseEvent):
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"""
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A DeleteDir event unfolds itself into a list of DeleteFile events for every
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file in the directory.
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"""
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def __init__(self, *args, **kwargs):
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super(DeleteDir, self).__init__(*args, **kwargs)
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def pack(self):
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return map_events( self.path, DeleteFile )
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class MoveDir(BaseEvent):
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"""
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A MoveDir event unfolds itself into a list of MoveFile events for every
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file in the directory.
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"""
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def __init__(self, *args, **kwargs):
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super(MoveDir, self).__init__(*args, **kwargs)
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def pack(self):
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return map_events( self.path, MoveFile )
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class DeleteDirWatch(BaseEvent):
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"""
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Deleting a watched directory is different from deleting any other
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directory. Hence we must have a separate event to handle this case
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"""
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def __init__(self, *args, **kwargs):
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super(DeleteDirWatch, self).__init__(*args, **kwargs)
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def pack(self):
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req_dict = {}
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req_dict['mode'] = u'delete_dir'
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req_dict['MDATA_KEY_FILEPATH'] = unicode( self.path + "/" )
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return [req_dict]
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