在同一代码中与另一个事件循环一起运行 aiohttp

Question

I have a bot that runs Telethon and aiohttp.server in the same code, working at the same time

This is a simplified example of how i ran it in aiohttp version 3.7.4.post0

from aiohttp import web
from telethon import TelegramClient

api_id="1234567"
api_hash="1234567890adcbefgh"
bot_token="1234567:abcdefgh0987654321"

bot=TelegramClient("my",api_id,api_hash).start(bot_token=bot_token)

# Simple TG handler
async def tg_handler(event):
    print(event.raw_text)
    await event.reply("HEY")

# Simple GET handler at /
async def http_handler_main(request):
    return web.Response(body="Hi",content_type="text/plain",charset="utf-8",status=200)

async def build_app():
    app=web.Application()
    app.add_routes([web.get("/",http_handler_main)])
    return app

bot.add_event_handler(tg_handler,events.NewMessage())
web.run_app(build_app(),port="80")

Since I updated to 3.8.1 this no longer works correctly I am using python 3.9.6 btw and Telethon version is still is the same as before this happened

EDIT1: EXPECTED BEHAVIOR: Run the webserver and the telegram bot

Answer 1

web.run_app creates a new asyncio event loop. Telethon by default uses the "current" asyncio event loop (which is the default for the main thread in this case). Because they're different even loops, they can't possibly work together.

Either create the TelegramClient inside async def build_app() (so it picks up the right event loop), or use web.run_app(..., loop=client.loop) .

If web.run_app does not support setting the loop, you will need to do whatever it's doing manually with client.loop instead.