Telethon/telethon/client/updates.py
2018-06-27 19:40:32 +02:00

279 lines
10 KiB
Python

import asyncio
import inspect
import itertools
import logging
import random
import time
from .users import UserMethods
from .. import events, utils, errors
from ..tl import types, functions
__log__ = logging.getLogger(__name__)
class UpdateMethods(UserMethods):
# region Public methods
async def _run_until_disconnected(self):
try:
await self.disconnected
except KeyboardInterrupt:
await self.disconnect()
def run_until_disconnected(self):
"""
Runs the event loop until `disconnect` is called or if an error
while connecting/sending/receiving occurs in the background. In
the latter case, said error will ``raise`` so you have a chance
to ``except`` it on your own code.
If the loop is already running, this method returns a coroutine
that you should await on your own code.
"""
if self.loop.is_running():
return self._run_until_disconnected()
try:
return self.loop.run_until_complete(self.disconnected)
except KeyboardInterrupt:
# Importing the magic sync module turns disconnect into sync.
# TODO Maybe disconnect() should not need the magic module...
if inspect.iscoroutinefunction(self.disconnect):
self.loop.run_until_complete(self.disconnect())
else:
self.disconnect()
def on(self, event):
"""
Decorator helper method around `add_event_handler`. Example:
>>> from telethon import TelegramClient, events
>>> client = TelegramClient(...)
>>>
>>> @client.on(events.NewMessage)
... async def handler(event):
... ...
...
>>>
Args:
event (`_EventBuilder` | `type`):
The event builder class or instance to be used,
for instance ``events.NewMessage``.
"""
def decorator(f):
self.add_event_handler(f, event)
return f
return decorator
def add_event_handler(self, callback, event=None):
"""
Registers the given callback to be called on the specified event.
Args:
callback (`callable`):
The callable function accepting one parameter to be used.
event (`_EventBuilder` | `type`, optional):
The event builder class or instance to be used,
for instance ``events.NewMessage``.
If left unspecified, `telethon.events.raw.Raw` (the
:tl:`Update` objects with no further processing) will
be passed instead.
"""
if isinstance(event, type):
event = event()
elif not event:
event = events.Raw()
self._events_pending_resolve.append(event)
self._event_builders.append((event, callback))
def remove_event_handler(self, callback, event=None):
"""
Inverse operation of :meth:`add_event_handler`.
If no event is given, all events for this callback are removed.
Returns how many callbacks were removed.
"""
found = 0
if event and not isinstance(event, type):
event = type(event)
i = len(self._event_builders)
while i:
i -= 1
ev, cb = self._event_builders[i]
if cb == callback and (not event or isinstance(ev, event)):
del self._event_builders[i]
found += 1
return found
def list_event_handlers(self):
"""
Lists all added event handlers, returning a list of pairs
consisting of (callback, event).
"""
return [(callback, event) for event, callback in self._event_builders]
async def catch_up(self):
state = self.session.get_update_state(0)
if not state or not state.pts:
return
self.session.catching_up = True
try:
while True:
d = await self(functions.updates.GetDifferenceRequest(
state.pts, state.date, state.qts))
if isinstance(d, types.updates.DifferenceEmpty):
state.date = d.date
state.seq = d.seq
break
elif isinstance(d, (types.updates.DifferenceSlice,
types.updates.Difference)):
if isinstance(d, types.updates.Difference):
state = d.state
elif d.intermediate_state.pts > state.pts:
state = d.intermediate_state
else:
# TODO Figure out why other applications can rely on
# using always the intermediate_state to eventually
# reach a DifferenceEmpty, but that leads to an
# infinite loop here (so check against old pts to stop)
break
self._handle_update(types.Updates(
users=d.users,
chats=d.chats,
date=state.date,
seq=state.seq,
updates=d.other_updates + [
types.UpdateNewMessage(m, 0, 0)
for m in d.new_messages
]
))
elif isinstance(d, types.updates.DifferenceTooLong):
break
finally:
self.session.set_update_state(0, state)
self.session.catching_up = False
# endregion
# region Private methods
def _handle_update(self, update):
self.session.process_entities(update)
if isinstance(update, (types.Updates, types.UpdatesCombined)):
entities = {utils.get_peer_id(x): x for x in
itertools.chain(update.users, update.chats)}
for u in update.updates:
u._entities = entities
self._handle_update(u)
if isinstance(update, types.UpdateShort):
self._handle_update(update.update)
else:
update._entities = getattr(update, '_entities', {})
self._loop.create_task(self._dispatch_update(update))
need_diff = False
if hasattr(update, 'pts'):
if self._state.pts and (update.pts - self._state.pts) > 1:
need_diff = True
self._state.pts = update.pts
if hasattr(update, 'date'):
self._state.date = update.date
if hasattr(update, 'seq'):
self._state.seq = update.seq
# TODO make use of need_diff
async def _update_loop(self):
# Pings' ID don't really need to be secure, just "random"
rnd = lambda: random.randrange(-2**63, 2**63)
while self.is_connected():
try:
await asyncio.wait_for(
self.disconnected, timeout=60, loop=self._loop
)
continue # We actually just want to act upon timeout
except asyncio.TimeoutError:
pass
except:
continue # Any disconnected exception should be ignored
# We also don't really care about their result.
# Just send them periodically.
self._sender.send(functions.PingRequest(rnd()))
# Entities and cached files are not saved when they are
# inserted because this is a rather expensive operation
# (default's sqlite3 takes ~0.1s to commit changes). Do
# it every minute instead. No-op if there's nothing new.
self.session.save()
# We need to send some content-related request at least hourly
# for Telegram to keep delivering updates, otherwise they will
# just stop even if we're connected. Do so every 30 minutes.
#
# TODO Call getDifference instead since it's more relevant
if time.time() - self._last_request > 30 * 60:
if not await self.is_user_authorized():
# What can be the user doing for so
# long without being logged in...?
continue
await self(functions.updates.GetStateRequest())
async def _dispatch_update(self, update):
if self._events_pending_resolve:
if self._event_resolve_lock.locked():
async with self._event_resolve_lock:
pass
else:
async with self._event_resolve_lock:
for event in self._events_pending_resolve:
await event.resolve(self)
self._events_pending_resolve.clear()
for builder, callback in self._event_builders:
event = builder.build(update)
if event:
if hasattr(event, '_set_client'):
event._set_client(self)
else:
event._client = self
event.original_update = update
try:
await callback(event)
except events.StopPropagation:
__log__.debug(
"Event handler '{}' stopped chain of "
"propagation for event {}."
.format(callback.__name__,
type(event).__name__)
)
break
except:
__log__.exception('Unhandled exception on {}'
.format(callback.__name__))
async def _handle_auto_reconnect(self):
# Upon reconnection, we want to send getState
# for Telegram to keep sending us updates.
try:
__log__.info('Asking for the current state after reconnect...')
state = await self(functions.updates.GetStateRequest())
__log__.info('Got new state! %s', state)
except errors.RPCError as e:
__log__.info('Failed to get current state: %r', e)
# endregion