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#!/usr/bin/env python

# pylint: disable=C0116,W0613

# This program is dedicated to the public domain under the CC0 license.

"""This is a very simple example on how one could implement a custom error handler."""

import html

import json

import logging

import traceback

from telegram import Update, ParseMode

from telegram.ext import Updater, CallbackContext, CommandHandler

logging.basicConfig(

format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO

)

logger = logging.getLogger(__name__)

# The token you got from @botfather when you created the bot

BOT_TOKEN = "TOKEN"

# This can be your own ID, or one for a developer group/channel.

# You can use the /start command of this bot to see your chat id.

DEVELOPER_CHAT_ID = 123456789

def error_handler(update: object, context: CallbackContext) -> None:

"""Log the error and send a telegram message to notify the developer."""

# Log the error before we do anything else, so we can see it even if something breaks.

logger.error(msg="Exception while handling an update:", exc_info=context.error)

# traceback.format_exception returns the usual python message about an exception, but as a

# list of strings rather than a single string, so we have to join them together.

tb_list = traceback.format_exception(None, context.error, context.error.__traceback__)

tb_string = ''.join(tb_list)

# Build the message with some markup and additional information about what happened.

# You might need to add some logic to deal with messages longer than the 4096 character limit.

update_str = update.to_dict() if isinstance(update, Update) else str(update)

message = (

f'An exception was raised while handling an update\n'

f'<pre>update = {html.escape(json.dumps(update_str, indent=2, ensure_ascii=False))}'

'</pre>\n\n'

f'<pre>context.chat_data = {html.escape(str(context.chat_data))}</pre>\n\n'

f'<pre>context.user_data = {html.escape(str(context.user_data))}</pre>\n\n'

f'<pre>{html.escape(tb_string)}</pre>'

)

# Finally, send the message

context.bot.send_message(chat_id=DEVELOPER_CHAT_ID, text=message, parse_mode=ParseMode.HTML)

def bad_command(update: Update, context: CallbackContext) -> None:

"""Raise an error to trigger the error handler."""

context.bot.wrong_method_name() # type: ignore[attr-defined]

def start(update: Update, context: CallbackContext) -> None:

"""Displays info on how to trigger an error."""

update.effective_message.reply_html(

'Use /bad_command to cause an error.\n'

f'Your chat id is <code>{update.effective_chat.id}</code>.'

)

def main() -> None:

"""Run the bot."""

# Create the Updater and pass it your bot's token.

updater = Updater(BOT_TOKEN)

# Get the dispatcher to register handlers

dispatcher = updater.dispatcher

# Register the commands...

dispatcher.add_handler(CommandHandler('start', start))

dispatcher.add_handler(CommandHandler('bad_command', bad_command))

# ...and the error handler

dispatcher.add_error_handler(error_handler)

# Start the Bot

updater.start_polling()

# Run the bot until you press Ctrl-C or the process receives SIGINT,

# SIGTERM or SIGABRT. This should be used most of the time, since

# start_polling() is non-blocking and will stop the bot gracefully.

updater.idle()

if __name__ == '__main__':

main()