Monitoring DBus with dbus-next

dbus-monitor.py

from dbus_next.aio import MessageBus
from dbus_next.message import Message
from dbus_next.constants import BusType
import asyncio

async def main():
    match = (
        "type='method_call',"
        "interface='org.freedesktop.PowerManagement.Inhibit',"
        "path='/org/freedesktop/PowerManagement/Inhibit'"
    )

    bus = await MessageBus(bus_type=BusType.SESSION).connect()
    await bus.call(Message(
        destination="org.freedesktop.DBus",
        path="/org/freedesktop/DBus",
        interface="org.freedesktop.DBus.Monitoring",
        member="BecomeMonitor",
        signature="asu",
        body=[[match], 0],
        serial=bus.next_serial(),
    ))
    bus.add_message_handler(handler)
    
def handler(message):
  print(message.member)
  return True

asyncio.run(main())