import abc import asyncio import collections import inspect import logging import platform import queue import sys import threading import time from datetime import timedelta, datetime from .. import version, syncio from ..crypto import rsa from ..extensions import markdown from ..network import MTProtoSender, ConnectionTcpFull from ..network.mtprotostate import MTProtoState from ..sessions import Session, SQLiteSession from ..tl import TLObject, functions, types from ..tl.alltlobjects import LAYER DEFAULT_DC_ID = 4 DEFAULT_IPV4_IP = '149.154.167.51' DEFAULT_IPV6_IP = '[2001:67c:4e8:f002::a]' DEFAULT_PORT = 443 __log__ = logging.getLogger(__name__) class TelegramBaseClient(abc.ABC): """ This is the abstract base class for the client. It defines some basic stuff like connecting, switching data center, etc, and leaves the `__call__` unimplemented. Args: session (`str` | `telethon.sessions.abstract.Session`, `None`): The file name of the session file to be used if a string is given (it may be a full path), or the Session instance to be used otherwise. If it's ``None``, the session will not be saved, and you should call :meth:`.log_out()` when you're done. Note that if you pass a string it will be a file in the current working directory, although you can also pass absolute paths. The session file contains enough information for you to login without re-sending the code, so if you have to enter the code more than once, maybe you're changing the working directory, renaming or removing the file, or using random names. api_id (`int` | `str`): The API ID you obtained from https://my.telegram.org. api_hash (`str`): The API ID you obtained from https://my.telegram.org. connection (`telethon.network.connection.common.Connection`, optional): The connection instance to be used when creating a new connection to the servers. If it's a type, the `proxy` argument will be used. Defaults to `telethon.network.connection.tcpfull.ConnectionTcpFull`. use_ipv6 (`bool`, optional): Whether to connect to the servers through IPv6 or not. By default this is ``False`` as IPv6 support is not too widespread yet. proxy (`tuple` | `dict`, optional): A tuple consisting of ``(socks.SOCKS5, 'host', port)``. See https://github.com/Anorov/PySocks#usage-1 for more. timeout (`int` | `float` | `timedelta`, optional): The timeout to be used when connecting, sending and receiving responses from the network. request_retries (`int`, optional): How many times a request should be retried. Request are retried when Telegram is having internal issues (due to either ``errors.ServerError`` or ``errors.RpcCallFailError``), when there is a ``errors.FloodWaitError`` less than `flood_sleep_threshold`, or when there's a migrate error. May set to a false-y value (``0`` or ``None``) for infinite retries, but this is not recommended, since some requests can always trigger a call fail (such as searching for messages). connection_retries (`int`, optional): How many times the reconnection should retry, either on the initial connection or when Telegram disconnects us. May be set to a false-y value (``0`` or ``None``) for infinite retries, but this is not recommended, since the program can get stuck in an infinite loop. auto_reconnect (`bool`, optional): Whether reconnection should be retried `connection_retries` times automatically if Telegram disconnects us or not. sequential_updates (`bool`, optional): By default every incoming update will be processed under the same thread (which means they're processed in a sequential order). You can disable this behaviour by setting it to ``False`` which will create a new thread per update. This gives more concurrency. flood_sleep_threshold (`int` | `float`, optional): The threshold below which the library should automatically sleep on flood wait errors (inclusive). For instance, if a ``FloodWaitError`` for 17s occurs and `flood_sleep_threshold` is 20s, the library will ``sleep`` automatically. If the error was for 21s, it would ``raise FloodWaitError`` instead. Values larger than a day (like ``float('inf')``) will be changed to a day. device_model (`str`, optional): "Device model" to be sent when creating the initial connection. Defaults to ``platform.node()``. system_version (`str`, optional): "System version" to be sent when creating the initial connection. Defaults to ``platform.system()``. app_version (`str`, optional): "App version" to be sent when creating the initial connection. Defaults to `telethon.version.__version__`. lang_code (`str`, optional): "Language code" to be sent when creating the initial connection. Defaults to ``'en'``. system_lang_code (`str`, optional): "System lang code" to be sent when creating the initial connection. Defaults to `lang_code`. """ # Current TelegramClient version __version__ = version.__version__ # Cached server configuration (with .dc_options), can be "global" _config = None _cdn_config = None # region Initialization def __init__(self, session, api_id, api_hash, *, connection=ConnectionTcpFull, use_ipv6=False, proxy=None, timeout=timedelta(seconds=10), request_retries=5, connection_retries=5, auto_reconnect=True, sequential_updates=True, flood_sleep_threshold=60, device_model=None, system_version=None, app_version=None, lang_code='en', system_lang_code='en'): if not api_id or not api_hash: raise ValueError( "Your API ID or Hash cannot be empty or None. " "Refer to telethon.rtfd.io for more information.") self._use_ipv6 = use_ipv6 # Determine what session object we have if isinstance(session, str) or session is None: session = SQLiteSession(session) elif not isinstance(session, Session): raise TypeError( 'The given session must be a str or a Session instance.' ) # ':' in session.server_address is True if it's an IPv6 address if (not session.server_address or (':' in session.server_address) != use_ipv6): session.set_dc( DEFAULT_DC_ID, DEFAULT_IPV6_IP if self._use_ipv6 else DEFAULT_IPV4_IP, DEFAULT_PORT ) self.flood_sleep_threshold = flood_sleep_threshold self.session = session self.api_id = int(api_id) self.api_hash = api_hash self._request_retries = request_retries or sys.maxsize self._connection_retries = connection_retries or sys.maxsize self._auto_reconnect = auto_reconnect if isinstance(connection, type): connection = connection( proxy=proxy, timeout=timeout) # Used on connection. Capture the variables in a lambda since # exporting clients need to create this InvokeWithLayerRequest. system = platform.uname() self._init_with = lambda x: functions.InvokeWithLayerRequest( LAYER, functions.InitConnectionRequest( api_id=self.api_id, device_model=device_model or system.system or 'Unknown', system_version=system_version or system.release or '1.0', app_version=app_version or self.__version__, lang_code=lang_code, system_lang_code=system_lang_code, lang_pack='', # "langPacks are for official apps only" query=x ) ) state = MTProtoState(self.session.auth_key) self._connection = connection self._sender = MTProtoSender( state, connection, retries=self._connection_retries, auto_reconnect=self._auto_reconnect, update_callback=self._handle_update, auth_key_callback=self._auth_key_callback, auto_reconnect_callback=self._handle_auto_reconnect ) # Remember flood-waited requests to avoid making them again self._flood_waited_requests = {} # Cache ``{dc_id: (n, MTProtoSender)}`` for all borrowed senders, # being ``n`` the amount of borrows a given sender has; once ``n`` # reaches ``0`` it should be disconnected and removed. self._borrowed_senders = {} self._borrow_sender_lock = threading.Lock() # Save whether the user is authorized here (a.k.a. logged in) self._authorized = None # None = We don't know yet # Default PingRequest delay self._last_ping = datetime.now() self._ping_delay = timedelta(minutes=1) self._updates_handle = None self._last_request = time.time() self._channel_pts = {} if sequential_updates: self._updates_queue = queue.Queue() self._dispatching_updates_queue = threading.Event() else: self._updates_queue = None self._dispatching_updates_queue = None # Start with invalid state (-1) so we can have somewhere to store # the state, but also be able to determine if we are authorized. self._state = types.updates.State(-1, 0, datetime.now(), 0, -1) # Some further state for subclasses self._event_builders = [] self._events_pending_resolve = [] self._event_resolve_lock = threading.Lock() # Keep track of how many event builders there are for # each type {type: count}. If there's at least one then # the event will be built, and the same event be reused. self._event_builders_count = collections.defaultdict(int) # Default parse mode self._parse_mode = markdown # Some fields to easy signing in. Let {phone: hash} be # a dictionary because the user may change their mind. self._phone_code_hash = {} self._phone = None self._tos = None # Sometimes we need to know who we are, cache the self peer self._self_input_peer = None # endregion # region Properties @property def disconnected(self): """ Future that resolves when the connection to Telegram ends, either by user action or in the background. """ return self._sender.disconnected # endregion # region Connecting def connect(self): """ Connects to Telegram. """ self._sender.connect( self.session.server_address, self.session.port) self._sender.send(self._init_with( functions.help.GetConfigRequest())).result() self._updates_handle = syncio.create_task(self._update_loop) def is_connected(self): """ Returns ``True`` if the user has connected. """ sender = getattr(self, '_sender', None) return sender and sender.is_connected() def disconnect(self): """ Disconnects from Telegram. """ self._disconnect() if getattr(self, 'session', None): self.session.close() def _disconnect(self): """ Disconnect only, without closing the session. Used in reconnections to different data centers, where we don't want to close the session file; user disconnects however should close it since it means that their job with the client is complete and we should clean it up all. """ # All properties may be ``None`` if `__init__` fails, and this # method will be called from `__del__` which would crash then. if getattr(self, '_sender', None): self._sender.disconnect() if getattr(self, '_updates_handle', None): if threading.current_thread() != self._updates_handle: self._updates_handle.join() def __del__(self): if not self.is_connected(): return self.disconnect() def _switch_dc(self, new_dc): """ Permanently switches the current connection to the new data center. """ __log__.info('Reconnecting to new data center %s', new_dc) dc = self._get_dc(new_dc) self.session.set_dc(dc.id, dc.ip_address, dc.port) # auth_key's are associated with a server, which has now changed # so it's not valid anymore. Set to None to force recreating it. self.session.auth_key = self._sender.state.auth_key = None self.session.save() self._disconnect() return self.connect() def _auth_key_callback(self, auth_key): """ Callback from the sender whenever it needed to generate a new authorization key. This means we are not authorized. """ self._authorized = None self.session.auth_key = auth_key self.session.save() # endregion # region Working with different connections/Data Centers def _get_dc(self, dc_id, cdn=False): """Gets the Data Center (DC) associated to 'dc_id'""" cls = self.__class__ if not cls._config: cls._config = self(functions.help.GetConfigRequest()) if cdn and not self._cdn_config: cls._cdn_config = self(functions.help.GetCdnConfigRequest()) for pk in cls._cdn_config.public_keys: rsa.add_key(pk.public_key) return next( dc for dc in cls._config.dc_options if dc.id == dc_id and bool(dc.ipv6) == self._use_ipv6 and bool(dc.cdn) == cdn ) def _create_exported_sender(self, dc_id): """ Creates a new exported `MTProtoSender` for the given `dc_id` and returns it. This method should be used by `_borrow_exported_sender`. """ # Thanks badoualy/kotlogram on /telegram/api/DefaultTelegramClient.kt # for clearly showing how to export the authorization dc = self._get_dc(dc_id) state = MTProtoState(None) # Can't reuse self._sender._connection as it has its own seqno. # # If one were to do that, Telegram would reset the connection # with no further clues. sender = MTProtoSender(state, self._connection.clone()) sender.connect(dc.ip_address, dc.port) __log__.info('Exporting authorization for data center %s', dc) auth = self(functions.auth.ExportAuthorizationRequest(dc_id)) req = self._init_with(functions.auth.ImportAuthorizationRequest( id=auth.id, bytes=auth.bytes )) sender.send(req).result() return sender def _borrow_exported_sender(self, dc_id): """ Borrows a connected `MTProtoSender` for the given `dc_id`. If it's not cached, creates a new one if it doesn't exist yet, and imports a freshly exported authorization key for it to be usable. Once its job is over it should be `_return_exported_sender`. """ with self._borrow_sender_lock: n, sender = self._borrowed_senders.get(dc_id, (0, None)) if not sender: sender = self._create_exported_sender(dc_id) sender.dc_id = dc_id elif not n: dc = self._get_dc(dc_id) sender.connect(dc.ip_address, dc.port) self._borrowed_senders[dc_id] = (n + 1, sender) return sender def _return_exported_sender(self, sender): """ Returns a borrowed exported sender. If all borrows have been returned, the sender is cleanly disconnected. """ with self._borrow_sender_lock: dc_id = sender.dc_id n, _ = self._borrowed_senders[dc_id] n -= 1 self._borrowed_senders[dc_id] = (n, sender) if not n: __log__.info('Disconnecting borrowed sender for DC %d', dc_id) sender.disconnect() def _get_cdn_client(self, cdn_redirect): """Similar to ._borrow_exported_client, but for CDNs""" # TODO Implement raise NotImplementedError session = self._exported_sessions.get(cdn_redirect.dc_id) if not session: dc = self._get_dc(cdn_redirect.dc_id, cdn=True) session = self.session.clone() session.set_dc(dc.id, dc.ip_address, dc.port) self._exported_sessions[cdn_redirect.dc_id] = session __log__.info('Creating new CDN client') client = TelegramBareClient( session, self.api_id, self.api_hash, proxy=self._sender.connection.conn.proxy, timeout=self._sender.connection.get_timeout() ) # This will make use of the new RSA keys for this specific CDN. # # We won't be calling GetConfigRequest because it's only called # when needed by ._get_dc, and also it's static so it's likely # set already. Avoid invoking non-CDN methods by not syncing updates. client.connect(_sync_updates=False) client._authorized = self._authorized return client # endregion # region Invoking Telegram requests @abc.abstractmethod def __call__(self, request, ordered=False): """ Invokes (sends) one or more MTProtoRequests and returns (receives) their result. Args: request (`TLObject` | `list`): The request or requests to be invoked. ordered (`bool`, optional): Whether the requests (if more than one was given) should be executed sequentially on the server. They run in arbitrary order by default. Returns: The result of the request (often a `TLObject`) or a list of results if more than one request was given. """ raise NotImplementedError @abc.abstractmethod def _handle_update(self, update): raise NotImplementedError @abc.abstractmethod def _update_loop(self): raise NotImplementedError @abc.abstractmethod def _handle_auto_reconnect(self): raise NotImplementedError # endregion