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#!/usr/bin/env python

# pylint: disable=unused-argument

# 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

from telegram.constants import ParseMode

from telegram.ext import Application, CommandHandler, ContextTypes

# Enable logging

logging.basicConfig(

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

)

# set higher logging level for httpx to avoid all GET and POST requests being logged

logging.getLogger("httpx").setLevel(logging.WARNING)

logger = logging.getLogger(__name__)

# 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

async def error_handler(update: object, context: ContextTypes.DEFAULT_TYPE) -> 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("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 = (

"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

await context.bot.send_message(

chat_id=DEVELOPER_CHAT_ID, text=message, parse_mode=ParseMode.HTML

)

async def bad_command(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:

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

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

async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:

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

await 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 Application and pass it your bot's token.

application = Application.builder().token("TOKEN").build()

# Register the commands...

application.add_handler(CommandHandler("start", start))

application.add_handler(CommandHandler("bad_command", bad_command))

# ...and the error handler

application.add_error_handler(error_handler)

# Run the bot until the user presses Ctrl-C

application.run_polling(allowed_updates=Update.ALL_TYPES)

if __name__ == "__main__":

main()