How to use pystemd to control systemd timedated ntp service?

I'm working on a python app that needs to get the NTPSynchronized parameter from system-timedated. I'd also like to be able to start and stop the NTP service by using the SetNTP method.

To communicate with timedated over d-bus I have been using this as reference: https://www.freedesktop.org/wiki/Software/systemd/timedated/

I previously got this working with dbus-python, but have since learned that this library has been deprecated. I tried the dbus_next package, but that does not have support for Python 3.5, which I need.

I came across the pystemd package, but I am unsure if this can be used to do what I want. The only documentation I have been able to find is this example (https://github.com/facebookincubator/pystemd), but I can not figure out how to use this to work with system-timedated.

Here is the code I have that works with dbus-python:

import dbus

BUS_NAME = 'org.freedesktop.timedate1`
IFACE = 'org.freedesktop.timedate1`

bus = dbus.SystemBus()
timedate_obj = bus.get_object(BUS_NAME, '/org/freedesktop/timedate1')

# Get synchronization value
is_sync = timedate_obj.Get(BUS_NAME, 'NTPSynchronized', dbus_interface=dbus.PROPERTIES_IFACE)

# Turn off NTP
timedate_obj.SetNTP(False,False, dbus_interface=IFACE)

Here's what I have so far with pystemd, but I don't think I'm accessing it in the right way:

from pystemd.systemd1 import Unit

unit = Unit(b'systemd-timesyncd.service')
unit.load()

# Try to access properties
prop = unit.Properties
prop.NTPSynchronized

Running that I get:

Attribute Error: 'SDInterface' object has no attribute 'NTPSynchronized'

I have a feeling that either the service I entered is wrong, or the way I'm accessing properties is wrong, or even both are wrong.

Any help or advice is appreciated.

Solution

Looking at the source code, it appears that using the pystemd.systemd1 Unit object has a default destination of "org.freedesktop.systemd1" + the service name (https://github.com/facebookincubator/pystemd/blob/master/pystemd/systemd1/unit.py)

This is not what I want because I am trying to access "org.freedesktop.timedate1" So instead I instantiated it's base class SDObject from pystemd.base (https://github.com/facebookincubator/pystemd/blob/master/pystemd/base.py)

The following code allowed me to get the sync status of NTP

from pystemd.base import SDObject

obj = SDObject(
    destination=b'org.freedesktop.timedate1',
    path=b'/org/freedesktop/timedate1',
    bus=None,
    _autoload=False
)

obj.load()

is_sync = obj.Properties.Get('org.freedesktop.timedate1','NTPSynchronized')

print(is_sync)

Not sure if this is what the library author intended, but hey it works!