get-managed-objects

#!/usr/bin/python3
#+
# DBussy example -- obtain all managed objects from a bus peer. Invoke
# this script as follows:
#
#     get-managed-objects session|system «bus_name»
#
# Copyright 2018 by Lawrence D'Oliveiro <ldo@geek-central.gen.nz>. This
# script is licensed CC0
# <https://creativecommons.org/publicdomain/zero/1.0/>; do with it
# what you will.
#-

import sys
import getopt
import dbussy as dbus
from dbussy import \
    DBUS, \
    DBUSX

#+
# Mainline
#-

if len(sys.argv) != 3 :
    raise getopt.GetoptError("usage: %s session|system «bus-name»" % sys.argv[0])
#end if
which_bus, destination = sys.argv[1:]

conn = dbus.Connection.bus_get \
  (
    {"session" : DBUS.BUS_SESSION, "system" : DBUS.BUS_SYSTEM}[which_bus.lower()],
    private = False
  )
conn.attach_asyncio()

request = dbus.Message.new_method_call \
  (
    destination = dbus.valid_bus_name(destination),
    path = "/",
    iface = DBUSX.INTERFACE_OBJECT_MANAGER,
    method = "GetManagedObjects"
  )
reply = conn.loop.run_until_complete(conn.send_await_reply(request))
objs = reply.expect_return_objects("a{oa{sa{sv}}}")[0]
if len(objs) != 0 :
    for pathname in sorted(objs.keys()) :
        sys.stdout.write("* %s:\n" % pathname)
        entry = objs[pathname]
        for interface in sorted(entry.keys()) :
            sys.stdout.write(" - %s:\n" % interface)
            props = entry[interface]
            for propname in sorted(props.keys()) :
                proptype, propvalue = props[propname]
                sys.stdout.write("    %s(%s) = %s\n" % (propname, proptype, repr(propvalue)))
            #end for
        #end for
    #end for
else :
    sys.stdout.write("(nothing)\n")
#end if