# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015-2019 Rapptz
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""
import asyncio
import itertools
import logging
import websockets
from .state import AutoShardedConnectionState
from .client import Client
from .gateway import *
from .errors import ClientException, InvalidArgument
from . import utils
from .enums import Status
log = logging.getLogger(__name__)
class Shard:
def __init__(self, ws, client):
self.ws = ws
self._client = client
self._dispatch = client.dispatch
self.loop = self._client.loop
self._current = self.loop.create_future()
self._current.set_result(None) # we just need an already done future
self._pending = asyncio.Event(loop=self.loop)
self._pending_task = None
@property
def id(self):
return self.ws.shard_id
def is_pending(self):
return not self._pending.is_set()
def complete_pending_reads(self):
self._pending.set()
async def _pending_reads(self):
try:
while self.is_pending():
await self.poll()
except asyncio.CancelledError:
pass
def launch_pending_reads(self):
self._pending_task = asyncio.ensure_future(self._pending_reads(), loop=self.loop)
def wait(self):
return self._pending_task
async def poll(self):
try:
await self.ws.poll_event()
except ResumeWebSocket:
log.info('Got a request to RESUME the websocket at Shard ID %s.', self.id)
coro = DiscordWebSocket.from_client(self._client, resume=True, shard_id=self.id,
session=self.ws.session_id, sequence=self.ws.sequence)
self._dispatch('disconnect')
self.ws = await asyncio.wait_for(coro, timeout=180.0, loop=self.loop)
def get_future(self):
if self._current.done():
self._current = asyncio.ensure_future(self.poll(), loop=self.loop)
return self._current
class AutoShardedClient(Client):
"""A client similar to :class:`Client` except it handles the complications
of sharding for the user into a more manageable and transparent single
process bot.
When using this client, you will be able to use it as-if it was a regular
:class:`Client` with a single shard when implementation wise internally it
is split up into multiple shards. This allows you to not have to deal with
IPC or other complicated infrastructure.
It is recommended to use this client only if you have surpassed at least
1000 guilds.
If no :attr:`.shard_count` is provided, then the library will use the
Bot Gateway endpoint call to figure out how many shards to use.
If a ``shard_ids`` parameter is given, then those shard IDs will be used
to launch the internal shards. Note that :attr:`.shard_count` must be provided
if this is used. By default, when omitted, the client will launch shards from
0 to ``shard_count - 1``.
Attributes
------------
shard_ids: Optional[List[:class:`int`]]
An optional list of shard_ids to launch the shards with.
"""
def __init__(self, *args, loop=None, **kwargs):
kwargs.pop('shard_id', None)
self.shard_ids = kwargs.pop('shard_ids', None)
super().__init__(*args, loop=loop, **kwargs)
if self.shard_ids is not None:
if self.shard_count is None:
raise ClientException('When passing manual shard_ids, you must provide a shard_count.')
elif not isinstance(self.shard_ids, (list, tuple)):
raise ClientException('shard_ids parameter must be a list or a tuple.')
self._connection = AutoShardedConnectionState(dispatch=self.dispatch, chunker=self._chunker,
handlers=self._handlers, syncer=self._syncer,
http=self.http, loop=self.loop, **kwargs)
# instead of a single websocket, we have multiple
# the key is the shard_id
self.shards = {}
def _get_websocket(guild_id):
i = (guild_id >> 22) % self.shard_count
return self.shards[i].ws
self._connection._get_websocket = _get_websocket
async def _chunker(self, guild, *, shard_id=None):
try:
guild_id = guild.id
shard_id = shard_id or guild.shard_id
except AttributeError:
guild_id = [s.id for s in guild]
payload = {
'op': 8,
'd': {
'guild_id': guild_id,
'query': '',
'limit': 0
}
}
ws = self.shards[shard_id].ws
await ws.send_as_json(payload)
@property
def latency(self):
""":class:`float`: Measures latency between a HEARTBEAT and a HEARTBEAT_ACK in seconds.
This operates similarly to :meth:`Client.latency` except it uses the average
latency of every shard's latency. To get a list of shard latency, check the
:attr:`latencies` property. Returns ``nan`` if there are no shards ready.
"""
if not self.shards:
return float('nan')
return sum(latency for _, latency in self.latencies) / len(self.shards)
@property
def latencies(self):
"""List[Tuple[:class:`int`, :class:`float`]]: A list of latencies between a HEARTBEAT and a HEARTBEAT_ACK in seconds.
This returns a list of tuples with elements ``(shard_id, latency)``.
"""
return [(shard_id, shard.ws.latency) for shard_id, shard in self.shards.items()]
async def request_offline_members(self, *guilds):
r"""|coro|
Requests previously offline members from the guild to be filled up
into the :attr:`Guild.members` cache. This function is usually not
called. It should only be used if you have the ``fetch_offline_members``
parameter set to ``False``.
When the client logs on and connects to the websocket, Discord does
not provide the library with offline members if the number of members
in the guild is larger than 250. You can check if a guild is large
if :attr:`Guild.large` is ``True``.
Parameters
-----------
\*guilds: :class:`Guild`
An argument list of guilds to request offline members for.
Raises
-------
InvalidArgument
If any guild is unavailable or not large in the collection.
"""
if any(not g.large or g.unavailable for g in guilds):
raise InvalidArgument('An unavailable or non-large guild was passed.')
_guilds = sorted(guilds, key=lambda g: g.shard_id)
for shard_id, sub_guilds in itertools.groupby(_guilds, key=lambda g: g.shard_id):
sub_guilds = list(sub_guilds)
await self._connection.request_offline_members(sub_guilds, shard_id=shard_id)
async def launch_shard(self, gateway, shard_id):
try:
coro = websockets.connect(gateway, loop=self.loop, klass=DiscordWebSocket, compression=None)
ws = await asyncio.wait_for(coro, loop=self.loop, timeout=180.0)
except Exception:
log.info('Failed to connect for shard_id: %s. Retrying...', shard_id)
await asyncio.sleep(5.0, loop=self.loop)
return await self.launch_shard(gateway, shard_id)
ws.token = self.http.token
ws._connection = self._connection
ws._discord_parsers = self._connection.parsers
ws._dispatch = self.dispatch
ws.gateway = gateway
ws.shard_id = shard_id
ws.shard_count = self.shard_count
ws._max_heartbeat_timeout = self._connection.heartbeat_timeout
try:
# OP HELLO
await asyncio.wait_for(ws.poll_event(), loop=self.loop, timeout=180.0)
await asyncio.wait_for(ws.identify(), loop=self.loop, timeout=180.0)
except asyncio.TimeoutError:
log.info('Timed out when connecting for shard_id: %s. Retrying...', shard_id)
await asyncio.sleep(5.0, loop=self.loop)
return await self.launch_shard(gateway, shard_id)
# keep reading the shard while others connect
self.shards[shard_id] = ret = Shard(ws, self)
ret.launch_pending_reads()
await asyncio.sleep(5.0, loop=self.loop)
async def launch_shards(self):
if self.shard_count is None:
self.shard_count, gateway = await self.http.get_bot_gateway()
else:
gateway = await self.http.get_gateway()
self._connection.shard_count = self.shard_count
shard_ids = self.shard_ids if self.shard_ids else range(self.shard_count)
for shard_id in shard_ids:
await self.launch_shard(gateway, shard_id)
shards_to_wait_for = []
for shard in self.shards.values():
shard.complete_pending_reads()
shards_to_wait_for.append(shard.wait())
# wait for all pending tasks to finish
await utils.sane_wait_for(shards_to_wait_for, timeout=300.0, loop=self.loop)
async def _connect(self):
await self.launch_shards()
while True:
pollers = [shard.get_future() for shard in self.shards.values()]
done, _ = await asyncio.wait(pollers, loop=self.loop, return_when=asyncio.FIRST_COMPLETED)
for f in done:
# we wanna re-raise to the main Client.connect handler if applicable
f.result()
async def close(self):
"""|coro|
Closes the connection to discord.
"""
if self.is_closed():
return
self._closed = True
for vc in self.voice_clients:
try:
await vc.disconnect()
except Exception:
pass
to_close = [shard.ws.close() for shard in self.shards.values()]
if to_close:
await asyncio.wait(to_close, loop=self.loop)
await self.http.close()
async def change_presence(self, *, activity=None, status=None, afk=False, shard_id=None):
"""|coro|
Changes the client's presence.
The activity parameter is a :class:`Activity` object (not a string) that represents
the activity being done currently. This could also be the slimmed down versions,
:class:`Game` and :class:`Streaming`.
Example: ::
game = discord.Game("with the API")
await client.change_presence(status=discord.Status.idle, activity=game)
Parameters
----------
activity: Optional[Union[:class:`Game`, :class:`Streaming`, :class:`Activity`]]
The activity being done. ``None`` if no currently active activity is done.
status: Optional[:class:`Status`]
Indicates what status to change to. If ``None``, then
:attr:`Status.online` is used.
afk: :class:`bool`
Indicates if you are going AFK. This allows the discord
client to know how to handle push notifications better
for you in case you are actually idle and not lying.
shard_id: Optional[:class:`int`]
The shard_id to change the presence to. If not specified
or ``None``, then it will change the presence of every
shard the bot can see.
Raises
------
InvalidArgument
If the ``activity`` parameter is not of proper type.
"""
if status is None:
status = 'online'
status_enum = Status.online
elif status is Status.offline:
status = 'invisible'
status_enum = Status.offline
else:
status_enum = status
status = str(status)
if shard_id is None:
for shard in self.shards.values():
await shard.ws.change_presence(activity=activity, status=status, afk=afk)
guilds = self._connection.guilds
else:
shard = self.shards[shard_id]
await shard.ws.change_presence(activity=activity, status=status, afk=afk)
guilds = [g for g in self._connection.guilds if g.shard_id == shard_id]
for guild in guilds:
me = guild.me
if me is None:
continue
me.activities = (activity,)
me.status = status_enum