Telegram bot with python-telegram-bot v20 via serverless function

Question

I created a telegram bot using python-telegram-bot v 20.2. I run it on the computer using application.run_polling(), and everything works fine.

But when I try to place it on a serverless structure with an entry point (handler(event, context)), I don't understand how to make it work.

I added a webhook without any problems using setWebhook. And I get the data without any problems using json.loads(event\['body'\]).

I tried using the solution from here, but couldn't figure out how it works.

Please tell me how to make the serverless function respond to me in telegram.

Code:

# A simple example of a handler that I found.
async def handler(event, context):
    body = json.loads(event['body'])
    print(body)
    return {
        'statusCode': 200,
        'body': 'Webhook request received'
    }

# The code that works on my computer.
def main() -> None:
    application = Application.builder().token(config.MYTOKEN).build()
    application.add_handler(CommandHandler("start", send_welcome))
    application.run_polling()

if __name__ == '__main__':
    main()

Answer 1

You were already on the right wiki page ;) Please read the last paragraph "Alternative: No long running tasks".

The point is that run_polling (as wrapper around Application.{initialize, start, stop, shutdown}) is designed for scripts that run 24/7, which is not what you need in your case. You only need to call Application.initialize, Application.process_update and Application.shutdown.

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Disclaimer: I'm currently the maintainer of python-telegram-bot.