mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-30 05:13:45 +03:00
692 lines
27 KiB
Python
692 lines
27 KiB
Python
import logging
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import os
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import threading
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import warnings
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from datetime import timedelta, datetime
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from signal import signal, SIGINT, SIGTERM, SIGABRT
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from threading import Lock
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from time import sleep
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from . import version
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from .crypto import rsa
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from .errors import (
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RPCError, BrokenAuthKeyError, ServerError, FloodWaitError,
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FloodTestPhoneWaitError, TypeNotFoundError, UnauthorizedError,
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PhoneMigrateError, NetworkMigrateError, UserMigrateError
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)
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from .network import authenticator, MtProtoSender, Connection, ConnectionMode
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from .tl import TLObject, Session
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from .tl.all_tlobjects import LAYER
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from .tl.functions import (
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InitConnectionRequest, InvokeWithLayerRequest, PingRequest
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)
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from .tl.functions.auth import (
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ImportAuthorizationRequest, ExportAuthorizationRequest
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)
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from .tl.functions.help import (
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GetCdnConfigRequest, GetConfigRequest
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)
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from .tl.functions.updates import GetStateRequest
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from .tl.types.auth import ExportedAuthorization
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from .update_state import UpdateState
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DEFAULT_DC_ID = 4
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DEFAULT_IPV4_IP = '149.154.167.51'
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DEFAULT_IPV6_IP = '[2001:67c:4e8:f002::a]'
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DEFAULT_PORT = 443
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__log__ = logging.getLogger(__name__)
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class TelegramBareClient:
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"""Bare Telegram Client with just the minimum -
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The reason to distinguish between a MtProtoSender and a
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TelegramClient itself is because the sender is just that,
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a sender, which should know nothing about Telegram but
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rather how to handle this specific connection.
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The TelegramClient itself should know how to initialize
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a proper connection to the servers, as well as other basic
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methods such as disconnection and reconnection.
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This distinction between a bare client and a full client
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makes it possible to create clones of the bare version
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(by using the same session, IP address and port) to be
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able to execute queries on either, without the additional
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cost that would involve having the methods for signing in,
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logging out, and such.
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"""
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# Current TelegramClient version
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__version__ = version.__version__
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# TODO Make this thread-safe, all connections share the same DC
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_config = None # Server configuration (with .dc_options)
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# region Initialization
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def __init__(self, session, api_id, api_hash,
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connection_mode=ConnectionMode.TCP_FULL,
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use_ipv6=False,
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proxy=None,
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update_workers=None,
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spawn_read_thread=False,
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timeout=timedelta(seconds=5),
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**kwargs):
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"""Refer to TelegramClient.__init__ for docs on this method"""
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if not api_id or not api_hash:
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raise ValueError(
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"Your API ID or Hash cannot be empty or None. "
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"Refer to telethon.rtfd.io for more information.")
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self._use_ipv6 = use_ipv6
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# Determine what session object we have
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if isinstance(session, str) or session is None:
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session = Session(session)
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elif not isinstance(session, Session):
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raise TypeError(
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'The given session must be a str or a Session instance.'
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)
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# ':' in session.server_address is True if it's an IPv6 address
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if (not session.server_address or
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(':' in session.server_address) != use_ipv6):
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session.set_dc(
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DEFAULT_DC_ID,
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DEFAULT_IPV6_IP if self._use_ipv6 else DEFAULT_IPV4_IP,
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DEFAULT_PORT
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)
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self.session = session
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self.api_id = int(api_id)
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self.api_hash = api_hash
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if self.api_id < 20: # official apps must use obfuscated
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connection_mode = ConnectionMode.TCP_OBFUSCATED
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# This is the main sender, which will be used from the thread
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# that calls .connect(). Every other thread will spawn a new
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# temporary connection. The connection on this one is always
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# kept open so Telegram can send us updates.
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self._sender = MtProtoSender(self.session, Connection(
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mode=connection_mode, proxy=proxy, timeout=timeout
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))
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# Two threads may be calling reconnect() when the connection is lost,
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# we only want one to actually perform the reconnection.
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self._reconnect_lock = Lock()
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# Cache "exported" sessions as 'dc_id: Session' not to recreate
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# them all the time since generating a new key is a relatively
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# expensive operation.
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self._exported_sessions = {}
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# This member will process updates if enabled.
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# One may change self.updates.enabled at any later point.
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self.updates = UpdateState(workers=update_workers)
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# Used on connection - the user may modify these and reconnect
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kwargs['app_version'] = kwargs.get('app_version', self.__version__)
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for name, value in kwargs.items():
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if not hasattr(self.session, name):
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raise ValueError('Unknown named parameter', name)
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setattr(self.session, name, value)
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# Despite the state of the real connection, keep track of whether
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# the user has explicitly called .connect() or .disconnect() here.
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# This information is required by the read thread, who will be the
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# one attempting to reconnect on the background *while* the user
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# doesn't explicitly call .disconnect(), thus telling it to stop
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# retrying. The main thread, knowing there is a background thread
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# attempting reconnection as soon as it happens, will just sleep.
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self._user_connected = False
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# Save whether the user is authorized here (a.k.a. logged in)
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self._authorized = None # None = We don't know yet
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# The first request must be in invokeWithLayer(initConnection(X)).
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# See https://core.telegram.org/api/invoking#saving-client-info.
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self._first_request = True
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# Constantly read for results and updates from within the main client,
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# if the user has left enabled such option.
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self._spawn_read_thread = spawn_read_thread
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self._recv_thread = None
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self._idling = threading.Event()
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# Default PingRequest delay
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self._last_ping = datetime.now()
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self._ping_delay = timedelta(minutes=1)
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# Some errors are known but there's nothing we can do from the
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# background thread. If any of these happens, call .disconnect(),
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# and raise them next time .invoke() is tried to be called.
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self._background_error = None
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# endregion
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# region Connecting
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def connect(self, _sync_updates=True):
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"""Connects to the Telegram servers, executing authentication if
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required. Note that authenticating to the Telegram servers is
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not the same as authenticating the desired user itself, which
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may require a call (or several) to 'sign_in' for the first time.
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Note that the optional parameters are meant for internal use.
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If '_sync_updates', sync_updates() will be called and a
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second thread will be started if necessary. Note that this
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will FAIL if the client is not connected to the user's
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native data center, raising a "UserMigrateError", and
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calling .disconnect() in the process.
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"""
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__log__.info('Connecting to %s:%d...',
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self.session.server_address, self.session.port)
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self._background_error = None # Clear previous errors
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try:
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self._sender.connect()
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__log__.info('Connection success!')
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# Connection was successful! Try syncing the update state
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# UNLESS '_sync_updates' is False (we probably are in
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# another data center and this would raise UserMigrateError)
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# to also assert whether the user is logged in or not.
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self._user_connected = True
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if self._authorized is None and _sync_updates:
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try:
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self.sync_updates()
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self._set_connected_and_authorized()
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except UnauthorizedError:
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self._authorized = False
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elif self._authorized:
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self._set_connected_and_authorized()
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return True
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except TypeNotFoundError as e:
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# This is fine, probably layer migration
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__log__.warning('Connection failed, got unexpected type with ID '
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'%s. Migrating?', hex(e.invalid_constructor_id))
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self.disconnect()
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return self.connect(_sync_updates=_sync_updates)
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except (RPCError, ConnectionError) as e:
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# Probably errors from the previous session, ignore them
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__log__.error('Connection failed due to %s', e)
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self.disconnect()
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return False
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def is_connected(self):
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return self._sender.is_connected()
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def _wrap_init_connection(self, query):
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"""Wraps query around InvokeWithLayerRequest(InitConnectionRequest())"""
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return InvokeWithLayerRequest(LAYER, InitConnectionRequest(
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api_id=self.api_id,
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device_model=self.session.device_model,
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system_version=self.session.system_version,
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app_version=self.session.app_version,
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lang_code=self.session.lang_code,
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system_lang_code=self.session.system_lang_code,
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lang_pack='', # "langPacks are for official apps only"
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query=query
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))
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def disconnect(self):
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"""Disconnects from the Telegram server
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and stops all the spawned threads"""
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__log__.info('Disconnecting...')
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self._user_connected = False # This will stop recv_thread's loop
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__log__.debug('Stopping all workers...')
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self.updates.stop_workers()
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# This will trigger a "ConnectionResetError" on the recv_thread,
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# which won't attempt reconnecting as ._user_connected is False.
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__log__.debug('Disconnecting the socket...')
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self._sender.disconnect()
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# TODO Shall we clear the _exported_sessions, or may be reused?
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self._first_request = True # On reconnect it will be first again
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def __del__(self):
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self.disconnect()
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def _reconnect(self, new_dc=None):
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"""If 'new_dc' is not set, only a call to .connect() will be made
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since it's assumed that the connection has been lost and the
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library is reconnecting.
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If 'new_dc' is set, the client is first disconnected from the
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current data center, clears the auth key for the old DC, and
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connects to the new data center.
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"""
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if new_dc is None:
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if self.is_connected():
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__log__.info('Reconnection aborted: already connected')
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return True
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try:
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__log__.info('Attempting reconnection...')
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return self.connect()
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except ConnectionResetError as e:
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__log__.warning('Reconnection failed due to %s', e)
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return False
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else:
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# Since we're reconnecting possibly due to a UserMigrateError,
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# we need to first know the Data Centers we can connect to. Do
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# that before disconnecting.
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dc = self._get_dc(new_dc)
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__log__.info('Reconnecting to new data center %s', dc)
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self.session.set_dc(dc.id, dc.ip_address, dc.port)
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# auth_key's are associated with a server, which has now changed
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# so it's not valid anymore. Set to None to force recreating it.
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self.session.auth_key = None
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self.session.save()
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self.disconnect()
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return self.connect()
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def set_proxy(self, proxy):
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"""Change the proxy used by the connections.
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"""
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if self.is_connected():
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raise RuntimeError("You can't change the proxy while connected.")
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self._sender.connection.conn.proxy = proxy
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# endregion
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# region Working with different connections/Data Centers
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def _on_read_thread(self):
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return self._recv_thread is not None and \
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threading.get_ident() == self._recv_thread.ident
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def _get_dc(self, dc_id, cdn=False):
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"""Gets the Data Center (DC) associated to 'dc_id'"""
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if not TelegramBareClient._config:
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TelegramBareClient._config = self(GetConfigRequest())
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try:
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if cdn:
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# Ensure we have the latest keys for the CDNs
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for pk in self(GetCdnConfigRequest()).public_keys:
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rsa.add_key(pk.public_key)
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return next(
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dc for dc in TelegramBareClient._config.dc_options
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if dc.id == dc_id and bool(dc.ipv6) == self._use_ipv6 and bool(dc.cdn) == cdn
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)
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except StopIteration:
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if not cdn:
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raise
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# New configuration, perhaps a new CDN was added?
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TelegramBareClient._config = self(GetConfigRequest())
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return self._get_dc(dc_id, cdn=cdn)
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def _get_exported_client(self, dc_id):
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"""Creates and connects a new TelegramBareClient for the desired DC.
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If it's the first time calling the method with a given dc_id,
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a new session will be first created, and its auth key generated.
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Exporting/Importing the authorization will also be done so that
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the auth is bound with the key.
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"""
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# Thanks badoualy/kotlogram on /telegram/api/DefaultTelegramClient.kt
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# for clearly showing how to export the authorization! ^^
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session = self._exported_sessions.get(dc_id)
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if session:
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export_auth = None # Already bound with the auth key
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else:
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# TODO Add a lock, don't allow two threads to create an auth key
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# (when calling .connect() if there wasn't a previous session).
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# for the same data center.
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dc = self._get_dc(dc_id)
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# Export the current authorization to the new DC.
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__log__.info('Exporting authorization for data center %s', dc)
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export_auth = self(ExportAuthorizationRequest(dc_id))
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# Create a temporary session for this IP address, which needs
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# to be different because each auth_key is unique per DC.
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#
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# Construct this session with the connection parameters
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# (system version, device model...) from the current one.
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session = Session(self.session)
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session.set_dc(dc.id, dc.ip_address, dc.port)
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self._exported_sessions[dc_id] = session
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__log__.info('Creating exported new client')
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client = TelegramBareClient(
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session, self.api_id, self.api_hash,
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proxy=self._sender.connection.conn.proxy,
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timeout=self._sender.connection.get_timeout()
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)
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client.connect(_sync_updates=False)
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if isinstance(export_auth, ExportedAuthorization):
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client(ImportAuthorizationRequest(
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id=export_auth.id, bytes=export_auth.bytes
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))
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elif export_auth is not None:
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__log__.warning('Unknown export auth type %s', export_auth)
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client._authorized = True # We exported the auth, so we got auth
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return client
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def _get_cdn_client(self, cdn_redirect):
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"""Similar to ._get_exported_client, but for CDNs"""
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session = self._exported_sessions.get(cdn_redirect.dc_id)
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if not session:
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dc = self._get_dc(cdn_redirect.dc_id, cdn=True)
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session = Session(self.session)
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session.set_dc(dc.id, dc.ip_address, dc.port)
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self._exported_sessions[cdn_redirect.dc_id] = session
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__log__.info('Creating new CDN client')
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client = TelegramBareClient(
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session, self.api_id, self.api_hash,
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proxy=self._sender.connection.conn.proxy,
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timeout=self._sender.connection.get_timeout()
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)
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# This will make use of the new RSA keys for this specific CDN.
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#
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# We won't be calling GetConfigRequest because it's only called
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# when needed by ._get_dc, and also it's static so it's likely
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# set already. Avoid invoking non-CDN methods by not syncing updates.
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client.connect(_sync_updates=False)
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client._authorized = self._authorized
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return client
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# endregion
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# region Invoking Telegram requests
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def __call__(self, *requests, retries=5):
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"""Invokes (sends) a MTProtoRequest and returns (receives) its result.
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The invoke will be retried up to 'retries' times before raising
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RuntimeError().
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"""
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if not all(isinstance(x, TLObject) and
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x.content_related for x in requests):
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raise TypeError('You can only invoke requests, not types!')
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if self._background_error:
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raise self._background_error
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# For logging purposes
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if len(requests) == 1:
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which = type(requests[0]).__name__
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else:
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which = '{} requests ({})'.format(
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len(requests), [type(x).__name__ for x in requests])
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# Determine the sender to be used (main or a new connection)
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__log__.debug('Invoking %s', which)
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call_receive = \
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not self._idling.is_set() or self._reconnect_lock.locked()
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for retry in range(retries):
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result = self._invoke(call_receive, *requests)
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if result is not None:
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return result
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__log__.warning('Invoking %s failed %d times, '
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'reconnecting and retrying',
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[str(x) for x in requests], retry + 1)
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sleep(1)
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# The ReadThread has priority when attempting reconnection,
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# since this thread is constantly running while __call__ is
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# only done sometimes. Here try connecting only once/retry.
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if not self._reconnect_lock.locked():
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with self._reconnect_lock:
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self._reconnect()
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raise RuntimeError('Number of retries reached 0.')
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# Let people use client.invoke(SomeRequest()) instead client(...)
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invoke = __call__
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def _invoke(self, call_receive, *requests):
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try:
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# Ensure that we start with no previous errors (i.e. resending)
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for x in requests:
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x.confirm_received.clear()
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x.rpc_error = None
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if not self.session.auth_key:
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__log__.info('Need to generate new auth key before invoking')
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self._first_request = True
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self.session.auth_key, self.session.time_offset = \
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authenticator.do_authentication(self._sender.connection)
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if self._first_request:
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__log__.info('Initializing a new connection while invoking')
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if len(requests) == 1:
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requests = [self._wrap_init_connection(requests[0])]
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else:
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# We need a SINGLE request (like GetConfig) to init conn.
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# Once that's done, the N original requests will be
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# invoked.
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TelegramBareClient._config = self(
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self._wrap_init_connection(GetConfigRequest())
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)
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self._sender.send(*requests)
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if not call_receive:
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# TODO This will be slightly troublesome if we allow
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# switching between constant read or not on the fly.
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# Must also watch out for calling .read() from two places,
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# in which case a Lock would be required for .receive().
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for x in requests:
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x.confirm_received.wait(
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self._sender.connection.get_timeout()
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)
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else:
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while not all(x.confirm_received.is_set() for x in requests):
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self._sender.receive(update_state=self.updates)
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except BrokenAuthKeyError:
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__log__.error('Authorization key seems broken and was invalid!')
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self.session.auth_key = None
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except TimeoutError:
|
|
__log__.warning('Invoking timed out') # We will just retry
|
|
|
|
except ConnectionResetError as e:
|
|
__log__.warning('Connection was reset while invoking')
|
|
if self._user_connected:
|
|
# Server disconnected us, __call__ will try reconnecting.
|
|
return None
|
|
else:
|
|
# User never called .connect(), so raise this error.
|
|
raise RuntimeError('Tried to invoke without .connect()') from e
|
|
|
|
# Clear the flag if we got this far
|
|
self._first_request = False
|
|
|
|
try:
|
|
raise next(x.rpc_error for x in requests if x.rpc_error)
|
|
except StopIteration:
|
|
if any(x.result is None for x in requests):
|
|
# "A container may only be accepted or
|
|
# rejected by the other party as a whole."
|
|
return None
|
|
|
|
if len(requests) == 1:
|
|
return requests[0].result
|
|
else:
|
|
return [x.result for x in requests]
|
|
|
|
except (PhoneMigrateError, NetworkMigrateError,
|
|
UserMigrateError) as e:
|
|
|
|
# TODO What happens with the background thread here?
|
|
# For normal use cases, this won't happen, because this will only
|
|
# be on the very first connection (not authorized, not running),
|
|
# but may be an issue for people who actually travel?
|
|
self._reconnect(new_dc=e.new_dc)
|
|
return self._invoke(call_receive, *requests)
|
|
|
|
except ServerError as e:
|
|
# Telegram is having some issues, just retry
|
|
__log__.error('Telegram servers are having internal errors %s', e)
|
|
|
|
except (FloodWaitError, FloodTestPhoneWaitError) as e:
|
|
__log__.warning('Request invoked too often, wait %ds', e.seconds)
|
|
if e.seconds > self.session.flood_sleep_threshold | 0:
|
|
raise
|
|
|
|
sleep(e.seconds)
|
|
|
|
# Some really basic functionality
|
|
|
|
def is_user_authorized(self):
|
|
"""Has the user been authorized yet
|
|
(code request sent and confirmed)?"""
|
|
return self._authorized
|
|
|
|
# endregion
|
|
|
|
# region Updates handling
|
|
|
|
def sync_updates(self):
|
|
"""Synchronizes self.updates to their initial state. Will be
|
|
called automatically on connection if self.updates.enabled = True,
|
|
otherwise it should be called manually after enabling updates.
|
|
"""
|
|
self.updates.process(self(GetStateRequest()))
|
|
|
|
def add_update_handler(self, handler):
|
|
"""Adds an update handler (a function which takes a TLObject,
|
|
an update, as its parameter) and listens for updates"""
|
|
if self.updates.workers is None:
|
|
warnings.warn(
|
|
"You have not setup any workers, so you won't receive updates."
|
|
" Pass update_workers=4 when creating the TelegramClient,"
|
|
" or set client.self.updates.workers = 4"
|
|
)
|
|
|
|
self.updates.handlers.append(handler)
|
|
|
|
def remove_update_handler(self, handler):
|
|
self.updates.handlers.remove(handler)
|
|
|
|
def list_update_handlers(self):
|
|
return self.updates.handlers[:]
|
|
|
|
# endregion
|
|
|
|
# region Constant read
|
|
|
|
def _set_connected_and_authorized(self):
|
|
self._authorized = True
|
|
self.updates.setup_workers()
|
|
if self._spawn_read_thread and self._recv_thread is None:
|
|
self._recv_thread = threading.Thread(
|
|
name='ReadThread', daemon=True,
|
|
target=self._recv_thread_impl
|
|
)
|
|
self._recv_thread.start()
|
|
|
|
def _signal_handler(self, signum, frame):
|
|
if self._user_connected:
|
|
self.disconnect()
|
|
else:
|
|
os._exit(1)
|
|
|
|
def idle(self, stop_signals=(SIGINT, SIGTERM, SIGABRT)):
|
|
"""
|
|
Idles the program by looping forever and listening for updates
|
|
until one of the signals are received, which breaks the loop.
|
|
|
|
:param stop_signals:
|
|
Iterable containing signals from the signal module that will
|
|
be subscribed to TelegramClient.disconnect() (effectively
|
|
stopping the idle loop), which will be called on receiving one
|
|
of those signals.
|
|
:return:
|
|
"""
|
|
if self._spawn_read_thread and not self._on_read_thread():
|
|
raise RuntimeError('Can only idle if spawn_read_thread=False')
|
|
|
|
self._idling.set()
|
|
for sig in stop_signals:
|
|
signal(sig, self._signal_handler)
|
|
|
|
if self._on_read_thread():
|
|
__log__.info('Starting to wait for items from the network')
|
|
else:
|
|
__log__.info('Idling to receive items from the network')
|
|
|
|
while self._user_connected:
|
|
try:
|
|
if datetime.now() > self._last_ping + self._ping_delay:
|
|
self._sender.send(PingRequest(
|
|
int.from_bytes(os.urandom(8), 'big', signed=True)
|
|
))
|
|
self._last_ping = datetime.now()
|
|
|
|
__log__.debug('Receiving items from the network...')
|
|
self._sender.receive(update_state=self.updates)
|
|
except TimeoutError:
|
|
# No problem
|
|
__log__.info('Receiving items from the network timed out')
|
|
except ConnectionResetError:
|
|
if self._user_connected:
|
|
__log__.error('Connection was reset while receiving '
|
|
'items. Reconnecting')
|
|
with self._reconnect_lock:
|
|
while self._user_connected and not self._reconnect():
|
|
sleep(0.1) # Retry forever, this is instant messaging
|
|
except:
|
|
self._idling.clear()
|
|
raise
|
|
|
|
self._idling.clear()
|
|
__log__.info('Connection closed by the user, not reading anymore')
|
|
|
|
# By using this approach, another thread will be
|
|
# created and started upon connection to constantly read
|
|
# from the other end. Otherwise, manual calls to .receive()
|
|
# must be performed. The MtProtoSender cannot be connected,
|
|
# or an error will be thrown.
|
|
#
|
|
# This way, sending and receiving will be completely independent.
|
|
def _recv_thread_impl(self):
|
|
# This thread is "idle" (only listening for updates), but also
|
|
# excepts everything unlike the manual idle because it should
|
|
# not crash.
|
|
while self._user_connected:
|
|
try:
|
|
self.idle(stop_signals=tuple())
|
|
except Exception as error:
|
|
__log__.exception('Unknown exception in the read thread! '
|
|
'Disconnecting and leaving it to main thread')
|
|
# Unknown exception, pass it to the main thread
|
|
|
|
try:
|
|
import socks
|
|
if isinstance(error, (
|
|
socks.GeneralProxyError, socks.ProxyConnectionError
|
|
)):
|
|
# This is a known error, and it's not related to
|
|
# Telegram but rather to the proxy. Disconnect and
|
|
# hand it over to the main thread.
|
|
self._background_error = error
|
|
self.disconnect()
|
|
break
|
|
except ImportError:
|
|
"Not using PySocks, so it can't be a proxy error"
|
|
|
|
self._recv_thread = None
|
|
|
|
# endregion
|