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366 lines
13 KiB
366 lines
13 KiB
# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (c) 2015-2017 Rapptz
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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"""
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from .state import AutoShardedConnectionState
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from .client import Client
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from .gateway import *
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from .errors import ClientException, InvalidArgument
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from . import compat, utils
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from .enums import Status
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import asyncio
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import logging
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import websockets
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import itertools
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log = logging.getLogger(__name__)
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class Shard:
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def __init__(self, ws, client):
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self.ws = ws
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self._client = client
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self.loop = self._client.loop
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self._current = compat.create_future(self.loop)
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self._current.set_result(None) # we just need an already done future
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self._pending = asyncio.Event(loop=self.loop)
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self._pending_task = None
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@property
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def id(self):
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return self.ws.shard_id
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def is_pending(self):
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return not self._pending.is_set()
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def complete_pending_reads(self):
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self._pending.set()
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def _pending_reads(self):
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try:
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while self.is_pending():
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yield from self.poll()
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except asyncio.CancelledError:
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pass
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def launch_pending_reads(self):
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self._pending_task = compat.create_task(self._pending_reads(), loop=self.loop)
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def wait(self):
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return self._pending_task
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@asyncio.coroutine
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def poll(self):
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try:
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yield from self.ws.poll_event()
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except ResumeWebSocket as e:
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log.info('Got a request to RESUME the websocket at Shard ID %s.', self.id)
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coro = DiscordWebSocket.from_client(self._client, resume=True,
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shard_id=self.id,
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session=self.ws.session_id,
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sequence=self.ws.sequence)
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self.ws = yield from asyncio.wait_for(coro, timeout=180.0, loop=self.loop)
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def get_future(self):
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if self._current.done():
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self._current = compat.create_task(self.poll(), loop=self.loop)
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return self._current
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@asyncio.coroutine
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def _ensure_coroutine_connect(gateway, loop):
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# In 3.5+ websockets.connect does not return a coroutine, but an awaitable.
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# The problem is that in 3.5.0 and in some cases 3.5.1, asyncio.ensure_future and
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# by proxy, asyncio.wait_for, do not accept awaitables, but rather futures or coroutines.
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# By wrapping it up into this function we ensure that it's in a coroutine and not an awaitable
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# even for 3.5.0 users.
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ws = yield from websockets.connect(gateway, loop=loop, klass=DiscordWebSocket)
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return ws
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class AutoShardedClient(Client):
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"""A client similar to :class:`Client` except it handles the complications
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of sharding for the user into a more manageable and transparent single
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process bot.
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When using this client, you will be able to use it as-if it was a regular
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:class:`Client` with a single shard when implementation wise internally it
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is split up into multiple shards. This allows you to not have to deal with
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IPC or other complicated infrastructure.
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It is recommended to use this client only if you have surpassed at least
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1000 guilds.
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If no :attr:`shard_count` is provided, then the library will use the
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Bot Gateway endpoint call to figure out how many shards to use.
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If a ``shard_ids`` parameter is given, then those shard IDs will be used
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to launch the internal shards. Note that :attr:`shard_count` must be provided
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if this is used. By default, when omitted, the client will launch shards from
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0 to ``shard_count - 1``.
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Attributes
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------------
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shard_ids: Optional[List[:class:`int`]]
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An optional list of shard_ids to launch the shards with.
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"""
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def __init__(self, *args, loop=None, **kwargs):
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kwargs.pop('shard_id', None)
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self.shard_ids = kwargs.pop('shard_ids', None)
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super().__init__(*args, loop=loop, **kwargs)
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if self.shard_ids is not None:
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if self.shard_count is None:
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raise ClientException('When passing manual shard_ids, you must provide a shard_count.')
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elif not isinstance(self.shard_ids, (list, tuple)):
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raise ClientException('shard_ids parameter must be a list or a tuple.')
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self._connection = AutoShardedConnectionState(dispatch=self.dispatch, chunker=self._chunker,
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syncer=self._syncer, http=self.http, loop=self.loop, **kwargs)
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# instead of a single websocket, we have multiple
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# the key is the shard_id
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self.shards = {}
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def _get_websocket(guild_id):
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i = (guild_id >> 22) % self.shard_count
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return self.shards[i].ws
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self._connection._get_websocket = _get_websocket
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@asyncio.coroutine
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def _chunker(self, guild, *, shard_id=None):
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try:
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guild_id = guild.id
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shard_id = shard_id or guild.shard_id
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except AttributeError:
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guild_id = [s.id for s in guild]
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payload = {
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'op': 8,
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'd': {
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'guild_id': guild_id,
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'query': '',
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'limit': 0
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}
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}
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ws = self.shards[shard_id].ws
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yield from ws.send_as_json(payload)
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@property
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def latency(self):
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""":class:`float`: Measures latency between a HEARTBEAT and a HEARTBEAT_ACK in seconds.
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This operates similarly to :meth:`.Client.latency` except it uses the average
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latency of every shard's latency. To get a list of shard latency, check the
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:attr:`latencies` property. Returns ``nan`` if there are no shards ready.
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"""
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if not self.shards:
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return float('nan')
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return sum(latency for _, latency in self.latencies) / len(self.shards)
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@property
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def latencies(self):
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"""List[Tuple[:class:`int`, :class:`float`]]: A list of latencies between a HEARTBEAT and a HEARTBEAT_ACK in seconds.
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This returns a list of tuples with elements ``(shard_id, latency)``.
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"""
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return [(shard_id, shard.ws.latency) for shard_id, shard in self.shards.items()]
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@asyncio.coroutine
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def request_offline_members(self, *guilds):
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"""|coro|
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Requests previously offline members from the guild to be filled up
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into the :attr:`Guild.members` cache. This function is usually not
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called. It should only be used if you have the ``fetch_offline_members``
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parameter set to ``False``.
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When the client logs on and connects to the websocket, Discord does
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not provide the library with offline members if the number of members
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in the guild is larger than 250. You can check if a guild is large
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if :attr:`Guild.large` is ``True``.
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Parameters
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-----------
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\*guilds
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An argument list of guilds to request offline members for.
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Raises
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-------
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InvalidArgument
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If any guild is unavailable or not large in the collection.
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"""
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if any(not g.large or g.unavailable for g in guilds):
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raise InvalidArgument('An unavailable or non-large guild was passed.')
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_guilds = sorted(guilds, key=lambda g: g.shard_id)
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for shard_id, sub_guilds in itertools.groupby(_guilds, key=lambda g: g.shard_id):
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sub_guilds = list(sub_guilds)
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yield from self._connection.request_offline_members(sub_guilds, shard_id=shard_id)
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@asyncio.coroutine
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def launch_shard(self, gateway, shard_id):
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try:
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ws = yield from asyncio.wait_for(_ensure_coroutine_connect(gateway, self.loop), loop=self.loop, timeout=180.0)
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except Exception as e:
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log.info('Failed to connect for shard_id: %s. Retrying...', shard_id)
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yield from asyncio.sleep(5.0, loop=self.loop)
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return (yield from self.launch_shard(gateway, shard_id))
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ws.token = self.http.token
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ws._connection = self._connection
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ws._dispatch = self.dispatch
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ws.gateway = gateway
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ws.shard_id = shard_id
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ws.shard_count = self.shard_count
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ws._max_heartbeat_timeout = self._connection.heartbeat_timeout
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try:
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# OP HELLO
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yield from asyncio.wait_for(ws.poll_event(), loop=self.loop, timeout=180.0)
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yield from asyncio.wait_for(ws.identify(), loop=self.loop, timeout=180.0)
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except asyncio.TimeoutError:
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log.info('Timed out when connecting for shard_id: %s. Retrying...', shard_id)
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yield from asyncio.sleep(5.0, loop=self.loop)
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return (yield from self.launch_shard(gateway, shard_id))
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# keep reading the shard while others connect
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self.shards[shard_id] = ret = Shard(ws, self)
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ret.launch_pending_reads()
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yield from asyncio.sleep(5.0, loop=self.loop)
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@asyncio.coroutine
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def launch_shards(self):
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if self.shard_count is None:
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self.shard_count, gateway = yield from self.http.get_bot_gateway()
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else:
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gateway = yield from self.http.get_gateway()
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self._connection.shard_count = self.shard_count
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shard_ids = self.shard_ids if self.shard_ids else range(self.shard_count)
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for shard_id in shard_ids:
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yield from self.launch_shard(gateway, shard_id)
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shards_to_wait_for = []
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for shard in self.shards.values():
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shard.complete_pending_reads()
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shards_to_wait_for.append(shard.wait())
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# wait for all pending tasks to finish
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yield from utils.sane_wait_for(shards_to_wait_for, timeout=300.0, loop=self.loop)
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@asyncio.coroutine
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def _connect(self):
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yield from self.launch_shards()
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while True:
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pollers = [shard.get_future() for shard in self.shards.values()]
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done, pending = yield from asyncio.wait(pollers, loop=self.loop, return_when=asyncio.FIRST_COMPLETED)
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for f in done:
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# we wanna re-raise to the main Client.connect handler if applicable
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f.result()
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@asyncio.coroutine
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def close(self):
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"""|coro|
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Closes the connection to discord.
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"""
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if self.is_closed():
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return
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self._closed.set()
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for vc in self.voice_clients:
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try:
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yield from vc.disconnect()
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except:
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pass
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to_close = [shard.ws.close() for shard in self.shards.values()]
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yield from asyncio.wait(to_close, loop=self.loop)
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yield from self.http.close()
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@asyncio.coroutine
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def change_presence(self, *, game=None, status=None, afk=False, shard_id=None):
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"""|coro|
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Changes the client's presence.
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The game parameter is a Game object (not a string) that represents
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a game being played currently.
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Parameters
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----------
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game: Optional[:class:`Game`]
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The game being played. None if no game is being played.
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status: Optional[:class:`Status`]
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Indicates what status to change to. If None, then
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:attr:`Status.online` is used.
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afk: bool
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Indicates if you are going AFK. This allows the discord
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client to know how to handle push notifications better
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for you in case you are actually idle and not lying.
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shard_id: Optional[int]
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The shard_id to change the presence to. If not specified
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or ``None``, then it will change the presence of every
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shard the bot can see.
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Raises
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------
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InvalidArgument
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If the ``game`` parameter is not :class:`Game` or None.
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"""
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if status is None:
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status = 'online'
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status_enum = Status.online
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elif status is Status.offline:
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status = 'invisible'
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status_enum = Status.offline
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else:
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status_enum = status
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status = str(status)
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if shard_id is None:
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for shard in self.shards.values():
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yield from shard.ws.change_presence(game=game, status=status, afk=afk)
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guilds = self._connection.guilds
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else:
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shard = self.shards[shard_id]
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yield from shard.ws.change_presence(game=game, status=status, afk=afk)
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guilds = [g for g in self._connection.guilds if g.shard_id == shard_id]
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for guild in guilds:
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me = guild.me
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if me is None:
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continue
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me.game = game
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me.status = status_enum
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