如何捕获 Telethon 事件协程上的错误？

Question

我使用以下脚本来收听来自公共电报频道和群组的新消息。

import configparser
from telethon.errors import SessionPasswordNeededError
from telethon import TelegramClient, events, sync
from telethon.tl.functions.messages import (GetHistoryRequest)
from telethon.tl.types import (
PeerChannel
)

api_id = 'xxxxxx'
api_hash = 'xxxxxxxxxxxxxxxxxxxxxxx'

#target channels that you want to listen to:
input_channels = ('https://t.me/xxxxxx','https://t.me/xxxx','https://t.me/xxxxxxx')

#create a client
client = TelegramClient('anon', api_id, api_hash)

# Listen to messages from target channels 
@client.on(events.NewMessage(chats=input_channels)) 
async def newMessageListener(event):
    # Get message text 
    newMessage = event.message.message 

    print(newMessage)


with client: 
    client.run_until_disconnected()

当频道关闭时，我收到以下错误：ValueError: No user has "closed_channel_name" as username并且我停止接收任何数据。

有没有办法识别无效频道？

到目前为止，我发现以下可以识别有效频道但可能有更好的方法：

client.start()
result = client.get_entity('https://t.me/xxxxxx')

Answer 1

以下方法用于在 Telethon 上捕获错误（在协程内）

import asyncio
from telethon import TelegramClient, events

session_name = 'anon'
api_id = 'xxxxxx'
api_hash = 'xxxxxxxxxxxxxxxxxxxxx'

chat_list = ('https://t.me/xxxxxxxx', 'https://t.me/xxxxxxxxxx')


async def main():
    async with TelegramClient(session_name, api_id, api_hash) as client:
        @client.on(events.NewMessage(chats=chat_list))
        async def handler(event):
            print(event.message.message)

        await client.run_until_disconnected()


def custom_exception_handler(loop, context):
    # first, handle with default handler
    loop.default_exception_handler(context)

    exception = context.get('exception')
    if isinstance(exception, ValueError):
        print(context['exception'])
        loop.stop()


loop = asyncio.get_event_loop()

# Set custom handler
loop.set_exception_handler(custom_exception_handler)
loop.create_task(main())
loop.run_forever()