mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-30 05:13:45 +03:00
330 lines
12 KiB
Python
330 lines
12 KiB
Python
import asyncio
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import inspect
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import itertools
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import logging
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import random
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import time
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from .users import UserMethods
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from .. import events, utils, errors
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from ..tl import types, functions
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__log__ = logging.getLogger(__name__)
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class UpdateMethods(UserMethods):
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# region Public methods
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async def _run_until_disconnected(self):
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try:
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await self.disconnected
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except KeyboardInterrupt:
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self.disconnect()
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def run_until_disconnected(self):
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"""
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Runs the event loop until `disconnect` is called or if an error
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while connecting/sending/receiving occurs in the background. In
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the latter case, said error will ``raise`` so you have a chance
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to ``except`` it on your own code.
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If the loop is already running, this method returns a coroutine
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that you should await on your own code.
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"""
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if self.loop.is_running():
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return self._run_until_disconnected()
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try:
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return self.loop.run_until_complete(self.disconnected)
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except KeyboardInterrupt:
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self.disconnect()
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def on(self, event):
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"""
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Decorator helper method around `add_event_handler`. Example:
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>>> from telethon import TelegramClient, events
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>>> client = TelegramClient(...)
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>>>
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>>> @client.on(events.NewMessage)
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... async def handler(event):
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... ...
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...
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>>>
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Args:
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event (`_EventBuilder` | `type`):
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The event builder class or instance to be used,
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for instance ``events.NewMessage``.
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"""
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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(self, callback, event=None):
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"""
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Registers the given callback to be called on the specified event.
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Args:
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callback (`callable`):
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The callable function accepting one parameter to be used.
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Note that if you have used `telethon.events.register` in
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the callback, ``event`` will be ignored, and instead the
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events you previously registered will be used.
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event (`_EventBuilder` | `type`, optional):
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The event builder class or instance to be used,
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for instance ``events.NewMessage``.
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If left unspecified, `telethon.events.raw.Raw` (the
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:tl:`Update` objects with no further processing) will
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be passed instead.
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"""
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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(self, callback, event=None):
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"""
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Inverse operation of :meth:`add_event_handler`.
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If no event is given, all events for this callback are removed.
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Returns how many callbacks were removed.
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"""
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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):
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"""
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Lists all added event handlers, returning a list of pairs
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consisting of (callback, event).
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"""
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return [(callback, event) for event, callback in self._event_builders]
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async def catch_up(self):
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"""
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"Catches up" on the missed updates while the client was offline.
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You should call this method after registering the event handlers
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so that the updates it loads can by processed by your script.
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This can also be used to forcibly fetch new updates if there are any.
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"""
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state = self.session.get_update_state(0)
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if not state or not state.pts:
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state = await self(functions.updates.GetStateRequest())
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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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state.pts, state.date, state.qts
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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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await 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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else:
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if isinstance(d, types.updates.DifferenceEmpty):
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state.date = d.date
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state.seq = d.seq
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elif isinstance(d, types.updates.DifferenceTooLong):
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state.pts = d.pts
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break
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finally:
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self.session.set_update_state(0, state)
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self.session.catching_up = False
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# endregion
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# region Private methods
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async def _handle_update(self, update):
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self.session.process_entities(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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u._entities = entities
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await self._handle_update(u)
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elif isinstance(update, types.UpdateShort):
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await self._handle_update(update.update)
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else:
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update._entities = getattr(update, '_entities', {})
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if self._updates_queue is None:
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self._loop.create_task(self._dispatch_update(update))
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else:
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self._updates_queue.put_nowait(update)
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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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need_diff = False
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if hasattr(update, 'pts') and update.pts is not None:
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if self._state.pts and (update.pts - self._state.pts) > 1:
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need_diff = True
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self._state.pts = update.pts
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if hasattr(update, 'date'):
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self._state.date = update.date
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if hasattr(update, 'seq'):
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self._state.seq = update.seq
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# TODO make use of need_diff
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async def _update_loop(self):
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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, loop=self._loop
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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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self.disconnect()
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return
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except Exception as e:
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continue # Any disconnected exception should be ignored
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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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self._sender.send(functions.PingRequest(rnd()))
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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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await self(functions.updates.GetStateRequest())
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async def _dispatch_queue_updates(self):
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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, update):
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built = EventBuilderDict(self, update)
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if self._conversations:
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for conv in self._conversations.values():
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if built[events.NewMessage]:
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conv._on_new_message(built[events.NewMessage])
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if built[events.MessageEdited]:
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conv._on_edit(built[events.MessageEdited])
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if built[events.MessageRead]:
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conv._on_read(built[events.MessageRead])
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if conv._custom:
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await conv._check_custom(built)
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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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if not builder.filter(event):
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continue
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try:
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await callback(event)
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except errors.AlreadyInConversationError:
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name = getattr(callback, '__name__', repr(callback))
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__log__.debug('Event handler "%s" already has an open '
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'conversation, ignoring new one', name)
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except events.StopPropagation:
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name = getattr(callback, '__name__', repr(callback))
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__log__.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:
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name = getattr(callback, '__name__', repr(callback))
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__log__.exception('Unhandled exception on %s', name)
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async def _handle_auto_reconnect(self):
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# Upon reconnection, we want to send getState
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# for Telegram to keep sending us updates.
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try:
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__log__.info('Asking for the current state after reconnect...')
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state = await self(functions.updates.GetStateRequest())
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__log__.info('Got new state! %s', state)
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except errors.RPCError as e:
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__log__.info('Failed to get current state: %r', e)
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# endregion
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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, update):
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self.client = client
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self.update = update
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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(self.update)
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if event:
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event.original_update = self.update
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if hasattr(event, '_set_client'):
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event._set_client(self.client)
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else:
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event._client = self.client
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return event
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