如何从事件循环外部(即从python-telegram-bot线程)发送带有discord.py的消息? [英] How to send a message with discord.py from outside the event loop (i.e. from python-telegram-bot thread)?

问题描述

我想使用通过使用库python-telegram-bot和discord.py(版本1.0.0)在不和谐和电报之间进行通信的机器人.但是问题是discord.py使用异步函数和python-telegram-bot线程.使用下面的代码，对于不和谐地发布的消息，一切正常(机器人将其正确发送给电报)，但是反之则不起作用(机器人从电报中获取消息并将其发送给不和谐).我以前在尝试在同步功能中运行不和谐的 channel.send 函数时遇到语法/运行时错误的问题(因此要么仅返回生成器对象，要么抱怨我无法使用 await 在同步功能中).但是，与此同时，python-telegram-bot的 MessageHandler 需要一个同步功能，因此当给他一个异步功能时，Python会抱怨从未为异步功能调用过"await".我现在尝试使用asgiref库中的async_to_sync方法从 MessageHandler 运行我的异步 broadcastMsg ，但是该代码仍然不会将消息发送给不和谐！似乎正确调用了该函数，但是直到行 print('I to to here')为止.不显示错误，并且不和谐地弹出任何消息.我想这与我必须在discord.py事件循环中将函数注册为任务这一事实有关，但是注册仅在 botDiscord.run(TOKENDISCORD)之前发生才有效已经执行了，当然必须先执行.因此，将我的问题归结为一个问题:我如何与另一个线程(来自电报 MessageHandler )与discord.py事件循环进行交互.或者，如果无法做到这一点:如何在不处于discord.py事件循环内的情况下，使用discord.py发送消息?

I want to use make a bot that communicates between discord and telegram by using the libraries python-telegram-bot and discord.py (version 1.0.0). However the problem is that discord.py uses async functions and python-telegram-bot threading. With the code below, everything works fine for messages being posted in discord (the bot sends them correctly to telegram), however the other way around does not work (bot gets messages from telegram and sends it to discord). I previously had issues with syntax/runtime errors as I tried to run the discords channel.send function in a sync function (thus either returning only a generator object or complaining that I cannot use await in a sync function). However, at the same time the python-telegram-bot's MessageHandler needs a sync function so when giving him a async function Python complains that "await" was never called for the async function. I now tried to use the async_to_sync method from asgiref library to run my async broadcastMsg from the MessageHandler, however the code still does not send the message to discord! It seems to call the function correctly but only until line print('I get to here'). No error is displayed and no message is poping up in discord. I guess it has something to do with the fact that I have to register the function as a task in the discord.py event loop, however registering is only working when it happens before botDiscord.run(TOKENDISCORD) has been executed which of course has to happen before. So to boil my problem down to one question: How am I able to interact with the discord.py event loop from another thread (which is from the telegram MessageHandler). Or if this is not possible: How can I send a message with discord.py without being within the discord.py event loop?

谢谢您的帮助

import asyncio
from asgiref.sync import async_to_sync
from telegram import Message as TMessage
from telegram.ext import (Updater,Filters,MessageHandler)
from discord.ext import commands
import discord

TChannelID = 'someTelegramChannelID'
DChannel = 'someDiscordChannelObject'

#%% define functions / commands
prefix = "?"
botDiscord = commands.Bot(command_prefix=prefix)
discordChannels = {}


async def broadcastMsg(medium,channel,message):
    ''' 
    Function to broadcast a message to all linked channels.
    '''
    if isinstance(message,TMessage):
        fromMedium = 'Telegram'
        author = message.from_user.username
        channel = message.chat.title
        content = message.text
    elif isinstance(message,discord.Message):
        fromMedium = 'Discord'
        author = message.author
        channel = message.channel.name
        content = message.content
    # check where message comes from        
    textToSend = '%s wrote on %s %s:\n%s'%(author,fromMedium,channel,content)
    # go through channels and send the message
    if 'telegram' in medium:
        # transform channel to telegram chatID and send
        updaterTelegram.bot.send_message(channel,textToSend)

    elif 'discord' in medium:
        print('I get to here')
        await channel.send(textToSend)

    print("I do not get there")


@botDiscord.event
async def on_message(message):
    await broadcastMsg('telegram',TChannelID,message)

def on_TMessage(bot,update):
    # check if this chat is already known, else save it
    # get channels to send to and send message
    async_to_sync(broadcastMsg)('discord',DChannel,update.message)


#%% initialize telegram and discord bot and run them
messageHandler = MessageHandler(Filters.text, on_TMessage)
updaterTelegram = Updater(token = TOKENTELEGRAM, request_kwargs={'read_timeout': 10, 'connect_timeout': 10})
updaterTelegram.dispatcher.add_handler(messageHandler)
updaterTelegram.start_polling()
botDiscord.run(TOKENDISCORD)  

推荐答案

如何不使用discord.py事件循环发送带有discord.py的消息?

How can I send a message with discord.py without being within the discord.py event loop?

要从事件循环线程外部安全安排协程，请使用 asyncio.run_coroutine_threadsafe :

To safely schedule a coroutine from outside the event loop thread, use asyncio.run_coroutine_threadsafe:

_loop = asyncio.get_event_loop()

def on_TMessage(bot, update):
    asyncio.run_coroutine_threadsafe(
        broadcastMsg('discord', DChannel, update.message), _loop)

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