Telethon/telethon/client/account.py
2019-08-13 23:33:39 +02:00

244 lines
9.3 KiB
Python

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