#!/usr/bin/env python3.8
# prom433
# Copyright (C) 2021 Andrew Wilkinson
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import paho.mqtt.client as mqtt
import traceback
import sys

from prom433 import get_arguments, serve, prometheus

def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))

    client.subscribe("rtl_433/+/events")


def safe_on_message(on_message):
    def safe_on_message(client, userdata, msg):
        try:
            return on_message(client, userdata, msg)
        except Exception as e:
            sys.stderr.write(f"Exception processing message: {msg}\n")

            traceback.print_exc()

    return safe_on_message


def main():
    args = get_arguments(sys.argv[1:])

    client = mqtt.Client()

    client.on_connect = on_connect
    client.on_message = \
        safe_on_message(lambda client, userdata, message: \
                        prometheus(message.payload.decode("utf-8"),
                                   args.drop_after))

    client.connect(args.mqtt)

    client.loop_start()

    serve(args)

if __name__ == "__main__":
    main()
