mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-22 17:36:34 +03:00
208 lines
8.4 KiB
Python
208 lines
8.4 KiB
Python
import functools
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import inspect
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from .users import UserMethods, _NOT_A_REQUEST
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from .. import helpers, utils
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from ..tl import functions, TLRequest
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# TODO Make use of :tl:`InvokeWithMessagesRange` somehow
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# For that, we need to use :tl:`GetSplitRanges` first.
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class _TakeoutClient:
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"""
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Proxy object over the client.
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"""
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__PROXY_INTERFACE = ('__enter__', '__exit__', '__aenter__', '__aexit__')
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def __init__(self, finalize, client, request):
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# We use the name mangling for attributes to make them inaccessible
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# from within the shadowed client object and to distinguish them from
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# its own attributes where needed.
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self.__finalize = finalize
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self.__client = client
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self.__request = request
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self.__success = None
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@property
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def success(self):
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return self.__success
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@success.setter
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def success(self, value):
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self.__success = value
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async def __aenter__(self):
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# Enter/Exit behaviour is "overrode", we don't want to call start.
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client = self.__client
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if client.session.takeout_id is None:
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client.session.takeout_id = (await client(self.__request)).id
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elif self.__request is not None:
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raise ValueError("Can't send a takeout request while another "
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"takeout for the current session still not been finished yet.")
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return self
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async def __aexit__(self, exc_type, exc_value, traceback):
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if self.__success is None and self.__finalize:
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self.__success = exc_type is None
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if self.__success is not None:
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result = await self(functions.account.FinishTakeoutSessionRequest(
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self.__success))
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if not result:
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raise ValueError("Failed to finish the takeout.")
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self.session.takeout_id = None
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__enter__ = helpers._sync_enter
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__exit__ = helpers._sync_exit
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async def __call__(self, request, ordered=False):
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takeout_id = self.__client.session.takeout_id
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if takeout_id is None:
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raise ValueError('Takeout mode has not been initialized '
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'(are you calling outside of "with"?)')
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single = not utils.is_list_like(request)
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requests = ((request,) if single else request)
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wrapped = []
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for r in requests:
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if not isinstance(r, TLRequest):
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raise _NOT_A_REQUEST()
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await r.resolve(self, utils)
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wrapped.append(functions.InvokeWithTakeoutRequest(takeout_id, r))
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return await self.__client(
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wrapped[0] if single else wrapped, ordered=ordered)
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def __getattribute__(self, name):
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# We access class via type() because __class__ will recurse infinitely.
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# Also note that since we've name-mangled our own class attributes,
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# they'll be passed to __getattribute__() as already decorated. For
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# example, 'self.__client' will be passed as '_TakeoutClient__client'.
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# https://docs.python.org/3/tutorial/classes.html#private-variables
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if name.startswith('__') and name not in type(self).__PROXY_INTERFACE:
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raise AttributeError # force call of __getattr__
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# Try to access attribute in the proxy object and check for the same
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# attribute in the shadowed object (through our __getattr__) if failed.
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return super().__getattribute__(name)
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def __getattr__(self, name):
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value = getattr(self.__client, name)
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if inspect.ismethod(value):
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# Emulate bound methods behavior by partially applying our proxy
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# class as the self parameter instead of the client.
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return functools.partial(
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getattr(self.__client.__class__, name), self)
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return value
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def __setattr__(self, name, value):
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if name.startswith('_{}__'.format(type(self).__name__.lstrip('_'))):
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# This is our own name-mangled attribute, keep calm.
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return super().__setattr__(name, value)
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return setattr(self.__client, name, value)
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class AccountMethods(UserMethods):
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def takeout(
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self, finalize=True, *, contacts=None, users=None, chats=None,
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megagroups=None, channels=None, files=None, max_file_size=None):
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"""
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Creates a proxy object over the current :ref:`TelegramClient` through
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which making requests will use :tl:`InvokeWithTakeoutRequest` to wrap
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them. In other words, returns the current client modified so that
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requests are done as a takeout:
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>>> from telethon.sync import TelegramClient
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>>>
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>>> with TelegramClient(...) as client:
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>>> with client.takeout() as takeout:
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>>> client.get_messages('me') # normal call
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>>> takeout.get_messages('me') # wrapped through takeout
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Some of the calls made through the takeout session will have lower
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flood limits. This is useful if you want to export the data from
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conversations or mass-download media, since the rate limits will
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be lower. Only some requests will be affected, and you will need
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to adjust the `wait_time` of methods like `client.iter_messages
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<telethon.client.messages.MessageMethods.iter_messages>`.
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By default, all parameters are ``None``, and you need to enable those
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you plan to use by setting them to either ``True`` or ``False``.
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You should ``except errors.TakeoutInitDelayError as e``, since this
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exception will raise depending on the condition of the session. You
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can then access ``e.seconds`` to know how long you should wait for
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before calling the method again.
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There's also a `success` property available in the takeout proxy
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object, so from the `with` body you can set the boolean result that
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will be sent back to Telegram. But if it's left ``None`` as by
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default, then the action is based on the `finalize` parameter. If
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it's ``True`` then the takeout will be finished, and if no exception
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occurred during it, then ``True`` will be considered as a result.
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Otherwise, the takeout will not be finished and its ID will be
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preserved for future usage as `client.session.takeout_id
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<telethon.sessions.abstract.Session.takeout_id>`.
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Args:
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contacts (`bool`):
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Set to ``True`` if you plan on downloading contacts.
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users (`bool`):
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Set to ``True`` if you plan on downloading information
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from users and their private conversations with you.
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chats (`bool`):
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Set to ``True`` if you plan on downloading information
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from small group chats, such as messages and media.
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megagroups (`bool`):
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Set to ``True`` if you plan on downloading information
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from megagroups (channels), such as messages and media.
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channels (`bool`):
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Set to ``True`` if you plan on downloading information
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from broadcast channels, such as messages and media.
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files (`bool`):
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Set to ``True`` if you plan on downloading media and
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you don't only wish to export messages.
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max_file_size (`int`):
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The maximum file size, in bytes, that you plan
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to download for each message with media.
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"""
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request_kwargs = dict(
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contacts=contacts,
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message_users=users,
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message_chats=chats,
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message_megagroups=megagroups,
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message_channels=channels,
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files=files,
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file_max_size=max_file_size
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)
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arg_specified = (arg is not None for arg in request_kwargs.values())
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if self.session.takeout_id is None or any(arg_specified):
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request = functions.account.InitTakeoutSessionRequest(
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**request_kwargs)
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else:
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request = None
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return _TakeoutClient(finalize, self, request)
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async def end_takeout(self, success):
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"""
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Finishes a takeout, with specified result sent back to Telegram.
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Returns:
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``True`` if the operation was successful, ``False`` otherwise.
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"""
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try:
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async with _TakeoutClient(True, self, None) as takeout:
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takeout.success = success
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except ValueError:
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return False
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return True
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