Flask-based Telegram bot not showing console errors

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1

I’m working on a Telegram bot using Flask and the telebot library. The problem is that when I switched from polling to webhooks, my bot stopped showing errors in the console. Here’s what’s happening:

import flask
from telebot import TeleBot, types

chatbot = TeleBot('your_token_here')
web_app = flask.Flask(__name__)

@web_app.route('/', methods=['POST'])
def incoming_message():
    if flask.request.headers.get('content-type') == 'application/json':
        data = flask.request.get_data().decode('utf-8')
        message = types.Update.de_json(data)
        chatbot.process_new_updates([message])
        return ''
    else:
        flask.abort(403)

@chatbot.message_handler(content_types=['text'])
def handle_text(message):
    chatbot.send_message(123, '')  # This should cause an error

if __name__ == '__main__':
    web_app.run()

When I run this, it doesn’t show any errors even though it should. The only way I can see errors is by wrapping everything in try-except blocks and manually printing them. What’s going on here? How can I make Flask show these errors in the console like it did with polling?

2

The issue you’re experiencing is likely due to Flask’s default error handling in production mode. To address this, you can configure Flask to run in debug mode, which will provide more detailed error information.

Add the following line before running your Flask app:

web_app.config['DEBUG'] = True

Also, consider modifying your main block to:

if __name__ == '__main__':
    web_app.run(debug=True)

This should enable more verbose error reporting. Additionally, you might want to implement proper error handling within your webhook route to catch and log specific exceptions. This approach will give you better visibility into any issues occurring during bot operation.

3

I’ve dealt with this exact problem before, and it can be frustrating. The root cause is likely that Flask is swallowing exceptions in the webhook handler. To fix this, you need to implement proper exception handling in your webhook route.

Try modifying your incoming_message function like this:

@web_app.route('/', methods=['POST'])
def incoming_message():
    try:
        if flask.request.headers.get('content-type') == 'application/json':
            data = flask.request.get_data().decode('utf-8')
            message = types.Update.de_json(data)
            chatbot.process_new_updates([message])
            return ''
        else:
            flask.abort(403)
    except Exception as e:
        print(f'Error in webhook: {str(e)}')
        return str(e), 500

This way, any exceptions that occur during webhook processing will be caught and printed to the console. You might also want to consider using a proper logging framework for more robust error tracking in production environments.

4

hey alice, i had a similar issue. try adding error logging to ur flask app. add this:

import logging
logging.basicConfig(level=logging.ERROR)

before ur webhook route. it should catch n print errors to console. hope this helps!