Telethon/telethon/statecache.py

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import inspect
from .tl import types
# Which updates have the following fields?
_has_channel_id = []
# TODO EntityCache does the same. Reuse?
def _fill():
for name in dir(types):
update = getattr(types, name)
if getattr(update, 'SUBCLASS_OF_ID', None) == 0x9f89304e:
cid = update.CONSTRUCTOR_ID
sig = inspect.signature(update.__init__)
for param in sig.parameters.values():
if param.name == 'channel_id' and param.annotation == int:
_has_channel_id.append(cid)
if not _has_channel_id:
raise RuntimeError('FIXME: Did the init signature or updates change?')
# We use a function to avoid cluttering the globals (with name/update/cid/doc)
_fill()
class StateCache:
"""
In-memory update state cache, defaultdict-like behaviour.
"""
def __init__(self, initial, loggers):
# We only care about the pts and the date. By using a tuple which
# is lightweight and immutable we can easily copy them around to
# each update in case they need to fetch missing entities.
self._logger = loggers[__name__]
if initial:
self._pts_date = initial.pts, initial.date
else:
self._pts_date = None, None
def reset(self):
self.__dict__.clear()
self._pts_date = None, None
# TODO Call this when receiving responses too...?
def update(
self,
update,
*,
channel_id=None,
has_pts=frozenset(x.CONSTRUCTOR_ID for x in (
types.UpdateNewMessage,
types.UpdateDeleteMessages,
types.UpdateReadHistoryInbox,
types.UpdateReadHistoryOutbox,
types.UpdateWebPage,
types.UpdateReadMessagesContents,
types.UpdateEditMessage,
types.updates.State,
types.updates.DifferenceTooLong,
types.UpdateShortMessage,
types.UpdateShortChatMessage,
types.UpdateShortSentMessage
)),
has_date=frozenset(x.CONSTRUCTOR_ID for x in (
types.UpdateUserPhoto,
types.UpdateEncryption,
types.UpdateEncryptedMessagesRead,
types.UpdateChatParticipantAdd,
types.updates.DifferenceEmpty,
types.UpdateShortMessage,
types.UpdateShortChatMessage,
types.UpdateShort,
types.UpdatesCombined,
types.Updates,
types.UpdateShortSentMessage,
)),
has_channel_pts=frozenset(x.CONSTRUCTOR_ID for x in (
types.UpdateChannelTooLong,
types.UpdateNewChannelMessage,
types.UpdateDeleteChannelMessages,
types.UpdateEditChannelMessage,
types.UpdateChannelWebPage,
types.updates.ChannelDifferenceEmpty,
types.updates.ChannelDifferenceTooLong,
types.updates.ChannelDifference
)),
check_only=False
):
"""
Update the state with the given update.
"""
cid = update.CONSTRUCTOR_ID
if check_only:
return cid in has_pts or cid in has_date or cid in has_channel_pts
if cid in has_pts:
if cid in has_date:
self._pts_date = update.pts, update.date
else:
self._pts_date = update.pts, self._pts_date[1]
elif cid in has_date:
self._pts_date = self._pts_date[0], update.date
if cid in has_channel_pts:
if channel_id is None:
channel_id = self.get_channel_id(update)
if channel_id is None:
self._logger.info(
'Failed to retrieve channel_id from %s', update)
else:
self.__dict__[channel_id] = update.pts
def get_channel_id(
self,
update,
has_channel_id=frozenset(_has_channel_id),
# Hardcoded because only some with message are for channels
has_message=frozenset(x.CONSTRUCTOR_ID for x in (
types.UpdateNewChannelMessage,
types.UpdateEditChannelMessage
))
):
"""
Gets the **unmarked** channel ID from this update, if it has any.
Fails for ``*difference`` updates, where ``channel_id``
is supposedly already known from the outside.
"""
cid = update.CONSTRUCTOR_ID
if cid in has_channel_id:
return update.channel_id
elif cid in has_message:
if update.message.to_id is None:
self._logger.info('Update has None to_id %s', update)
else:
return update.message.to_id.channel_id
return None
def __getitem__(self, item):
"""
If `item` is `None`, returns the default ``(pts, date)``.
If it's an **unmarked** channel ID, returns its ``pts``.
If no information is known, ``pts`` will be `None`.
"""
if item is None:
return self._pts_date
else:
return self.__dict__.get(item)
def __setitem__(self, where, value):
if where is None:
self._pts_date = value
else:
self.__dict__[where] = value