mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2025-02-18 12:30:59 +03:00
473 lines
18 KiB
Python
473 lines
18 KiB
Python
import asyncio
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import inspect
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import itertools
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import random
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import sys
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import time
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import traceback
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import typing
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import logging
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from .. import events, utils, errors
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from ..events.common import EventBuilder, EventCommon
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from ..tl import types, functions
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if typing.TYPE_CHECKING:
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from .telegramclient import TelegramClient
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Callback = typing.Callable[[typing.Any], typing.Any]
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async def _run_until_disconnected(self: 'TelegramClient'):
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try:
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# Make a high-level request to notify that we want updates
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await self(functions.updates.GetStateRequest())
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return await self.disconnected
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except KeyboardInterrupt:
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pass
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finally:
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await self.disconnect()
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async def set_receive_updates(self: 'TelegramClient', receive_updates):
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self._no_updates = not receive_updates
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if receive_updates:
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await self(functions.updates.GetStateRequest())
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async def run_until_disconnected(self: 'TelegramClient'):
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return await self._run_until_disconnected()
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def on(self: 'TelegramClient', event: EventBuilder):
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def decorator(f):
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self.add_event_handler(f, event)
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return f
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return decorator
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def add_event_handler(
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self: 'TelegramClient',
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callback: Callback,
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event: EventBuilder = None):
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builders = events._get_handlers(callback)
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if builders is not None:
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for event in builders:
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self._event_builders.append((event, callback))
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return
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if isinstance(event, type):
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event = event()
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elif not event:
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event = events.Raw()
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self._event_builders.append((event, callback))
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def remove_event_handler(
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self: 'TelegramClient',
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callback: Callback,
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event: EventBuilder = None) -> int:
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found = 0
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if event and not isinstance(event, type):
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event = type(event)
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i = len(self._event_builders)
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while i:
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i -= 1
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ev, cb = self._event_builders[i]
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if cb == callback and (not event or isinstance(ev, event)):
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del self._event_builders[i]
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found += 1
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return found
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def list_event_handlers(self: 'TelegramClient')\
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-> 'typing.Sequence[typing.Tuple[Callback, EventBuilder]]':
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return [(callback, event) for event, callback in self._event_builders]
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async def catch_up(self: 'TelegramClient'):
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pts, date = self._state_cache[None]
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if not pts:
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return
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self.session.catching_up = True
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try:
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while True:
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d = await self(functions.updates.GetDifferenceRequest(
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pts, date, 0
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))
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if isinstance(d, (types.updates.DifferenceSlice,
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types.updates.Difference)):
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if isinstance(d, types.updates.Difference):
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state = d.state
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else:
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state = d.intermediate_state
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pts, date = state.pts, state.date
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self._handle_update(types.Updates(
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users=d.users,
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chats=d.chats,
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date=state.date,
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seq=state.seq,
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updates=d.other_updates + [
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types.UpdateNewMessage(m, 0, 0)
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for m in d.new_messages
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]
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))
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# TODO Implement upper limit (max_pts)
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# We don't want to fetch updates we already know about.
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#
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# We may still get duplicates because the Difference
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# contains a lot of updates and presumably only has
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# the state for the last one, but at least we don't
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# unnecessarily fetch too many.
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#
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# updates.getDifference's pts_total_limit seems to mean
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# "how many pts is the request allowed to return", and
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# if there is more than that, it returns "too long" (so
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# there would be duplicate updates since we know about
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# some). This can be used to detect collisions (i.e.
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# it would return an update we have already seen).
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else:
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if isinstance(d, types.updates.DifferenceEmpty):
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date = d.date
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elif isinstance(d, types.updates.DifferenceTooLong):
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pts = d.pts
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break
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except (ConnectionError, asyncio.CancelledError):
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pass
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finally:
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# TODO Save new pts to session
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self._state_cache._pts_date = (pts, date)
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self.session.catching_up = False
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# It is important to not make _handle_update async because we rely on
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# the order that the updates arrive in to update the pts and date to
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# be always-increasing. There is also no need to make this async.
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def _handle_update(self: 'TelegramClient', update):
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self.session.process_entities(update)
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self._entity_cache.add(update)
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if isinstance(update, (types.Updates, types.UpdatesCombined)):
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entities = {utils.get_peer_id(x): x for x in
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itertools.chain(update.users, update.chats)}
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for u in update.updates:
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self._process_update(u, update.updates, entities=entities)
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elif isinstance(update, types.UpdateShort):
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self._process_update(update.update, None)
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else:
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self._process_update(update, None)
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self._state_cache.update(update)
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def _process_update(self: 'TelegramClient', update, others, entities=None):
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update._entities = entities or {}
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# This part is somewhat hot so we don't bother patching
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# update with channel ID/its state. Instead we just pass
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# arguments which is faster.
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channel_id = self._state_cache.get_channel_id(update)
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args = (update, others, channel_id, self._state_cache[channel_id])
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if self._dispatching_updates_queue is None:
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task = self.loop.create_task(self._dispatch_update(*args))
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self._updates_queue.add(task)
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task.add_done_callback(lambda _: self._updates_queue.discard(task))
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else:
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self._updates_queue.put_nowait(args)
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if not self._dispatching_updates_queue.is_set():
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self._dispatching_updates_queue.set()
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self.loop.create_task(self._dispatch_queue_updates())
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self._state_cache.update(update)
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async def _update_loop(self: 'TelegramClient'):
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# Pings' ID don't really need to be secure, just "random"
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rnd = lambda: random.randrange(-2**63, 2**63)
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while self.is_connected():
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try:
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await asyncio.wait_for(
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self.disconnected, timeout=60
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)
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continue # We actually just want to act upon timeout
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except asyncio.TimeoutError:
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pass
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except asyncio.CancelledError:
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return
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except Exception:
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continue # Any disconnected exception should be ignored
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# Check if we have any exported senders to clean-up periodically
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await self._clean_exported_senders()
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# Don't bother sending pings until the low-level connection is
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# ready, otherwise a lot of pings will be batched to be sent upon
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# reconnect, when we really don't care about that.
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if not self._sender._transport_connected():
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continue
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# We also don't really care about their result.
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# Just send them periodically.
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try:
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self._sender._keepalive_ping(rnd())
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except (ConnectionError, asyncio.CancelledError):
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return
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# Entities and cached files are not saved when they are
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# inserted because this is a rather expensive operation
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# (default's sqlite3 takes ~0.1s to commit changes). Do
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# it every minute instead. No-op if there's nothing new.
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self.session.save()
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# We need to send some content-related request at least hourly
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# for Telegram to keep delivering updates, otherwise they will
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# just stop even if we're connected. Do so every 30 minutes.
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#
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# TODO Call getDifference instead since it's more relevant
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if time.time() - self._last_request > 30 * 60:
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if not await self.is_user_authorized():
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# What can be the user doing for so
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# long without being logged in...?
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continue
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try:
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await self(functions.updates.GetStateRequest())
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except (ConnectionError, asyncio.CancelledError):
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return
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async def _dispatch_queue_updates(self: 'TelegramClient'):
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while not self._updates_queue.empty():
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await self._dispatch_update(*self._updates_queue.get_nowait())
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self._dispatching_updates_queue.clear()
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async def _dispatch_update(self: 'TelegramClient', update, others, channel_id, pts_date):
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if not self._entity_cache.ensure_cached(update):
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# We could add a lock to not fetch the same pts twice if we are
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# already fetching it. However this does not happen in practice,
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# which makes sense, because different updates have different pts.
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if self._state_cache.update(update, check_only=True):
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# If the update doesn't have pts, fetching won't do anything.
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# For example, UpdateUserStatus or UpdateChatUserTyping.
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try:
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await self._get_difference(update, channel_id, pts_date)
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except OSError:
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pass # We were disconnected, that's okay
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except errors.RPCError:
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# There's a high chance the request fails because we lack
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# the channel. Because these "happen sporadically" (#1428)
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# we should be okay (no flood waits) even if more occur.
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pass
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except ValueError:
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# There is a chance that GetFullChannelRequest and GetDifferenceRequest
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# inside the _get_difference() function will end up with
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# ValueError("Request was unsuccessful N time(s)") for whatever reasons.
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pass
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if not self._self_input_peer:
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# Some updates require our own ID, so we must make sure
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# that the event builder has offline access to it. Calling
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# `get_me()` will cache it under `self._self_input_peer`.
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#
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# It will return `None` if we haven't logged in yet which is
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# fine, we will just retry next time anyway.
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try:
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await self.get_me(input_peer=True)
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except OSError:
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pass # might not have connection
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built = EventBuilderDict(self, update, others)
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for builder, callback in self._event_builders:
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event = built[type(builder)]
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if not event:
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continue
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if not builder.resolved:
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await builder.resolve(self)
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filter = builder.filter(event)
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if inspect.isawaitable(filter):
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filter = await filter
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if not filter:
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continue
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try:
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await callback(event)
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except events.StopPropagation:
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name = getattr(callback, '__name__', repr(callback))
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self._log[__name__].debug(
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'Event handler "%s" stopped chain of propagation '
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'for event %s.', name, type(event).__name__
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)
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break
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except Exception as e:
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if not isinstance(e, asyncio.CancelledError) or self.is_connected():
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name = getattr(callback, '__name__', repr(callback))
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self._log[__name__].exception('Unhandled exception on %s', name)
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async def _dispatch_event(self: 'TelegramClient', event):
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"""
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Dispatches a single, out-of-order event. Used by `AlbumHack`.
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"""
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# We're duplicating a most logic from `_dispatch_update`, but all in
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# the name of speed; we don't want to make it worse for all updates
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# just because albums may need it.
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for builder, callback in self._event_builders:
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if isinstance(builder, events.Raw):
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continue
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if not isinstance(event, builder.Event):
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continue
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if not builder.resolved:
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await builder.resolve(self)
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filter = builder.filter(event)
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if inspect.isawaitable(filter):
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filter = await filter
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if not filter:
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continue
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try:
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await callback(event)
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except events.StopPropagation:
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name = getattr(callback, '__name__', repr(callback))
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self._log[__name__].debug(
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'Event handler "%s" stopped chain of propagation '
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'for event %s.', name, type(event).__name__
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)
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break
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except Exception as e:
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if not isinstance(e, asyncio.CancelledError) or self.is_connected():
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name = getattr(callback, '__name__', repr(callback))
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self._log[__name__].exception('Unhandled exception on %s', name)
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async def _get_difference(self: 'TelegramClient', update, channel_id, pts_date):
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"""
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Get the difference for this `channel_id` if any, then load entities.
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Calls :tl:`updates.getDifference`, which fills the entities cache
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(always done by `__call__`) and lets us know about the full entities.
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"""
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# Fetch since the last known pts/date before this update arrived,
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# in order to fetch this update at full, including its entities.
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self._log[__name__].debug('Getting difference for entities '
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'for %r', update.__class__)
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if channel_id:
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# There are reports where we somehow call get channel difference
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# with `InputPeerEmpty`. Check our assumptions to better debug
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# this when it happens.
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assert isinstance(channel_id, int), 'channel_id was {}, not int in {}'.format(type(channel_id), update)
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try:
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# Wrap the ID inside a peer to ensure we get a channel back.
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where = await self.get_input_entity(types.PeerChannel(channel_id))
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except ValueError:
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# There's a high chance that this fails, since
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# we are getting the difference to fetch entities.
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return
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if not pts_date:
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# First-time, can't get difference. Get pts instead.
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result = await self(functions.channels.GetFullChannelRequest(
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utils.get_input_channel(where)
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))
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self._state_cache[channel_id] = result.full_chat.pts
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return
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result = await self(functions.updates.GetChannelDifferenceRequest(
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channel=where,
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filter=types.ChannelMessagesFilterEmpty(),
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pts=pts_date, # just pts
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limit=100,
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force=True
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))
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else:
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if not pts_date[0]:
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# First-time, can't get difference. Get pts instead.
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result = await self(functions.updates.GetStateRequest())
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self._state_cache[None] = result.pts, result.date
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return
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result = await self(functions.updates.GetDifferenceRequest(
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pts=pts_date[0],
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date=pts_date[1],
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qts=0
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))
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if isinstance(result, (types.updates.Difference,
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types.updates.DifferenceSlice,
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types.updates.ChannelDifference,
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types.updates.ChannelDifferenceTooLong)):
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update._entities.update({
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utils.get_peer_id(x): x for x in
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itertools.chain(result.users, result.chats)
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})
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async def _handle_auto_reconnect(self: 'TelegramClient'):
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# TODO Catch-up
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# For now we make a high-level request to let Telegram
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# know we are still interested in receiving more updates.
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try:
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await self.get_me()
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except Exception as e:
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self._log[__name__].warning('Error executing high-level request '
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'after reconnect: %s: %s', type(e), e)
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return
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try:
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self._log[__name__].info(
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'Asking for the current state after reconnect...')
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# TODO consider:
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# If there aren't many updates while the client is disconnected
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# (I tried with up to 20), Telegram seems to send them without
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# asking for them (via updates.getDifference).
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#
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# On disconnection, the library should probably set a "need
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# difference" or "catching up" flag so that any new updates are
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# ignored, and then the library should call updates.getDifference
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# itself to fetch them.
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#
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# In any case (either there are too many updates and Telegram
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# didn't send them, or there isn't a lot and Telegram sent them
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# but we dropped them), we fetch the new difference to get all
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# missed updates. I feel like this would be the best solution.
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# If a disconnection occurs, the old known state will be
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# the latest one we were aware of, so we can catch up since
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# the most recent state we were aware of.
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await self.catch_up()
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self._log[__name__].info('Successfully fetched missed updates')
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except errors.RPCError as e:
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self._log[__name__].warning('Failed to get missed updates after '
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'reconnect: %r', e)
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except Exception:
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self._log[__name__].exception(
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'Unhandled exception while getting update difference after reconnect')
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class EventBuilderDict:
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"""
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Helper "dictionary" to return events from types and cache them.
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"""
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def __init__(self, client: 'TelegramClient', update, others):
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self.client = client
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self.update = update
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self.others = others
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def __getitem__(self, builder):
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try:
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return self.__dict__[builder]
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except KeyError:
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event = self.__dict__[builder] = builder.build(
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self.update, self.others, self.client._self_id)
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if isinstance(event, EventCommon):
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event.original_update = self.update
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event._entities = self.update._entities
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event._set_client(self.client)
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elif event:
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event._client = self.client
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return event
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