Discord.py bot + Quart：尝试连接到语音通道总是会出现 "task got future attached to a different loop"

Question

我一直在尝试创建一个可以通过网络界面接收命令的 discord 机器人。我使用 discord.py 作为 Discord API 包装器，使用 Quart 作为 REST 框架，因为我需要处理异步任务，而 Flask 不支持它们。

现在我有两个文件：

app.py

import discord

bot = discord.Client(intents=discord.Intents.all())

...

async def play_audio(audio_name, voiceChannel):
    vc = await voiceChannel.connect()
    print("test")
    vc.play(discord.FFmpegPCMAudio(source="audio\{}".format(audio_name), executable=FFMPEG_PATH))
    while vc.is_playing():
        time.sleep(.1)
    await vc.disconnect()

async def get_online_voice_members():
    guild = bot.get_guild(NMC_GUILD_ID)
    online_voice_users = {}
    for voiceChannel in guild.voice_channels:
        for user in voiceChannel.members:
            online_voice_users[user] = voiceChannel
    return online_voice_users

...

api.py

import asyncio
from quart import Quart
import app as discord

QUART_APP = Quart(__name__)

@QUART_APP.before_serving
async def before_serving():
    loop = asyncio.get_event_loop()
    await discord.bot.login("MY BOT TOKEN")
    loop.create_task(discord.bot.connect())

...

@QUART_APP.route("/online_list", methods=["GET"])
async def get_online_members():
    resp = {}
    members = await discord.get_online_voice_members()
    for user in members.keys():
        resp[user.id] = {"nick" : user.nick, "channel" : members[user].id}
    return resp

@QUART_APP.route("/goodnight", methods=["GET"])
async def send_goodnight():
    members = await discord.get_online_voice_members()
    for user in members.keys():
        if user.id == 12345:
            await discord.play_audio("goodnight.mp3", members[user])
            break
    return {"response":"OK"}

当我在端点 /online_list 上发出 GET 请求时一切正常，但是当我在 /goodnight 上发出请求时，代码成功运行直到到达指令 await discord.play_audio("goodnight.mp3, members[user])，它接收正确的参数，但它总是引发以下异常：

Traceback (most recent call last):
  File "G:\Gunther\venv\lib\site-packages\quart\app.py", line 1814, in handle_request
    return await self.full_dispatch_request(request_context)
  File "G:\Gunther\venv\lib\site-packages\quart\app.py", line 1836, in full_dispatch_request
    result = await self.handle_user_exception(error)
  File "G:\Gunther\venv\lib\site-packages\quart\app.py", line 1076, in handle_user_exception
    raise error
  File "G:\Gunther\venv\lib\site-packages\quart\app.py", line 1834, in full_dispatch_request
    result = await self.dispatch_request(request_context)
  File "G:\Gunther\venv\lib\site-packages\quart\app.py", line 1882, in dispatch_request
    return await handler(**request_.view_args)
  File "G:/Dati HDD F/GitHub Projects/Gunther/api.py", line 59, in send_buonanotte
    await discord.play_audio("goodnight.mp3", members[user])
  File "G:\Gunther\app.py", line 55, in play_audio
    vc = await voiceChannel.connect()
  File "G:\Gunther\venv\lib\site-packages\discord\abc.py", line 1122, in connect
    await voice.connect(timeout=timeout, reconnect=reconnect)
  File "G:\Gunther\venv\lib\site-packages\discord\voice_client.py", line 352, in connect
    self.ws = await self.connect_websocket()
  File "G:\Gunther\venv\lib\site-packages\discord\voice_client.py", line 323, in connect_websocket
    await ws.poll_event()
  File "G:\Gunther\venv\lib\site-packages\discord\gateway.py", line 893, in poll_event
    await self.received_message(json.loads(msg.data))
  File "G:\Gunther\venv\lib\site-packages\discord\gateway.py", line 825, in received_message
    await self.initial_connection(data)
  File "G:\Gunther\venv\lib\site-packages\discord\gateway.py", line 849, in initial_connection
    recv = await self.loop.sock_recv(state.socket, 70)
  File "C:\Users\Kyles\AppData\Local\Programs\Python\Python38\lib\asyncio\proactor_events.py", line 693, in sock_recv
    return await self._proactor.recv(sock, n)
RuntimeError: Task <Task pending name='Task-27' coro=<ASGIHTTPConnection.handle_request() running at G:\Gunther\venv\lib\site-packages\quart\asgi.py:70> cb=[_wait.<locals>._on_completion() at C:\Users\Kyles\AppData\Local\Programs\Python\Python38\lib\asyncio\tasks.py:507]> got Future <_OverlappedFuture pending overlapped=<pending, 0x199c31f0ca0>> attached to a different loop

我想我没有正确理解 asyncio 库的工作原理，因为在我看来，无论我尝试什么，app.py 中的 vc = await voiceChannel.connect() 行总是以运行在与主循环不同的循环中。有什么我想念的吗？

Answer 1

这是因为您在导入时启动了 discord 客户端（app.py 的第 3 行）。这样做意味着它将使用导入时可用的事件循环。然而，Quart（和 Hypercorn，除非被告知不要）将关闭现有循环并在它开始时创建一个新循环。出于这个原因，我建议使用 startup 功能进行初始化。

为了解决这个问题，我会将您的 discord 命令包装在 class 中，并在启动函数中对其进行初始化。请注意，我喜欢将实例存储在应用程序本身上（因此可以通过 current_app 代理访问它们），但这不是必需的。例如，

app.py

class DiscordClient:
    def __init__(self):
        self.bot = discord.Client(intents=discord.Intents.all())
        ...

    async def get_online_voice_members(self):
        guild = self.bot.get_guild(NMC_GUILD_ID)
        ...

api.py

@QUART_APP.before_serving
async def before_serving():
    loop = asyncio.get_event_loop()
    QUART_APP.discord_client = DiscordClient()
    await QUART_APP.discord_client.bot.login("MY BOT TOKEN")
    loop.create_task(QUART_APP.discord_client.bot.connect())

@QUART_APP.route("/online_list", methods=["GET"])
async def get_online_members():
    resp = {}
    members = await QUART_APP.discord_client.get_online_voice_members()
    ...

Discord.py bot + Quart：尝试连接到语音通道总是会出现 "task got future attached to a different loop"

Discord.py bot + Quart: Trying to connect to a voice channel always gives a "task got future attached to a different loop"

python

python-asyncio

discord.py

quart