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import abc
import asyncio
import warnings
from .. import utils
from ..tl import TLObject, types
from ..tl.custom.chatgetter import ChatGetter
async def _into_id_set(client, chats):
"""Helper util to turn the input chat or chats into a set of IDs."""
if chats is None:
return None
if not utils.is_list_like(chats):
chats = (chats,)
result = set()
for chat in chats:
if isinstance(chat, int):
if chat < 0:
result.add(chat) # Explicitly marked IDs are negative
else:
result.update({ # Support all valid types of peers
utils.get_peer_id(types.PeerUser(chat)),
utils.get_peer_id(types.PeerChat(chat)),
utils.get_peer_id(types.PeerChannel(chat)),
})
elif isinstance(chat, TLObject) and chat.SUBCLASS_OF_ID == 0x2d45687:
# 0x2d45687 == crc32(b'Peer')
result.add(utils.get_peer_id(chat))
else:
chat = await client.get_input_entity(chat)
if isinstance(chat, types.InputPeerSelf):
chat = await client.get_me(input_peer=True)
result.add(utils.get_peer_id(chat))
return result
class EventBuilder(abc.ABC):
"""
The common event builder, with builtin support to filter per chat.
Args:
chats (`entity`, optional):
May be one or more entities (username/peer/etc.), preferably IDs.
By default, only matching chats will be handled.
blacklist_chats (`bool`, optional):
Whether to treat the chats as a blacklist instead of
as a whitelist (default). This means that every chat
will be handled *except* those specified in ``chats``
which will be ignored if ``blacklist_chats=True``.
func (`callable`, optional):
A callable (async or not) function that should accept the event as input
parameter, and return a value indicating whether the event
should be dispatched or not (any truthy value will do, it
does not need to be a `bool`). It works like a custom filter:
.. code-block:: python
@client.on(events.NewMessage(func=lambda e: e.is_private))
async def handler(event):
pass # code here
"""
def __init__(self, chats=None, *, blacklist_chats=False, func=None):
self.chats = chats
self.blacklist_chats = bool(blacklist_chats)
self.resolved = False
self.func = func
self._resolve_lock = None
@classmethod
@abc.abstractmethod
def build(cls, update, others=None, self_id=None):
"""
Builds an event for the given update if possible, or returns None.
`others` are the rest of updates that came in the same container
as the current `update`.
`self_id` should be the current user's ID, since it is required
for some events which lack this information but still need it.
"""
# TODO So many parameters specific to only some update types seems dirty
async def resolve(self, client):
"""Helper method to allow event builders to be resolved before usage"""
if self.resolved:
return
if not self._resolve_lock:
self._resolve_lock = asyncio.Lock()
async with self._resolve_lock:
if not self.resolved:
await self._resolve(client)
self.resolved = True
async def _resolve(self, client):
self.chats = await _into_id_set(client, self.chats)
def filter(self, event):
"""
Returns a truthy value if the event passed the filter and should be
used, or falsy otherwise. The return value may need to be awaited.
The events must have been resolved before this can be called.
"""
if not self.resolved:
return
if self.chats is not None:
# Note: the `event.chat_id` property checks if it's `None` for us
inside = event.chat_id in self.chats
if inside == self.blacklist_chats:
# If this chat matches but it's a blacklist ignore.
# If it doesn't match but it's a whitelist ignore.
return
if not self.func:
return True
# Return the result of func directly as it may need to be awaited
return self.func(event)
class EventCommon(ChatGetter, abc.ABC):
"""
Intermediate class with common things to all events.
Remember that this class implements `ChatGetter
<telethon.tl.custom.chatgetter.ChatGetter>` which
means you have access to all chat properties and methods.
In addition, you can access the `original_update`
field which contains the original :tl:`Update`.
"""
_event_name = 'Event'
def __init__(self, chat_peer=None, msg_id=None, broadcast=None):
super().__init__(chat_peer, broadcast=broadcast)
self._entities = {}
self._client = None
self._message_id = msg_id
self.original_update = None
def _set_client(self, client):
"""
Setter so subclasses can act accordingly when the client is set.
"""
self._client = client
if self._chat_peer:
self._chat, self._input_chat = utils._get_entity_pair(
self.chat_id, self._entities, client._mb_entity_cache)
else:
self._chat = self._input_chat = None
@property
def client(self):
"""
The `telethon.TelegramClient` that created this event.
"""
return self._client
def __str__(self):
return TLObject.pretty_format(self.to_dict())
def stringify(self):
return TLObject.pretty_format(self.to_dict(), indent=0)
def to_dict(self):
d = {k: v for k, v in self.__dict__.items() if k[0] != '_'}
d['_'] = self._event_name
return d
def name_inner_event(cls):
"""Decorator to rename cls.Event 'Event' as 'cls.Event'"""
if hasattr(cls, 'Event'):
cls.Event._event_name = '{}.Event'.format(cls.__name__)
else:
warnings.warn('Class {} does not have a inner Event'.format(cls))
return cls
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