exceptionbot.py

#!/usr/bin/env python
#
# Semaphore: A simple (rule-based) bot library for Signal Private Messenger.
# Copyright (C) 2020-2022 Lazlo Westerhof <semaphore@lazlo.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""
Signal Bot example, with custom exception handler.
"""
import logging
import os

from semaphore import Bot, ChatContext


async def raise_exception(ctx: ChatContext) -> None:
    raise Exception("Please handle me")


async def exception_handler(exception: Exception, context: ChatContext) -> None:
    logging.error(f"An exception was caught: {exception}. The message received was "
                  f"{context.message.get_body()}")


async def main() -> None:
    """Start the bot."""
    # Connect the bot to number.
    async with Bot(os.environ["SIGNAL_PHONE_NUMBER"]) as bot:
        bot.register_handler("", raise_exception)
        bot.set_exception_handler(exception_handler)

        # Run the bot until you press Ctrl-C.
        await bot.start()


if __name__ == '__main__':
    import anyio

    anyio.run(main)