dasbus
This DBus library is written in Python 3, based on GLib and inspired by pydbus. Find out more in the documentation.
The code used to be part of the Anaconda Installer project. It was based on the pydbus library, but we replaced it with our own solution because its upstream development stalled. The dasbus library is a result of this effort.
Requirements
- Python 3.6+
- PyGObject 3
You can install PyGObject provided by your system or use PyPI.
The system package is usually called python3-gi, python3-gobject or pygobject3. See the
instructions for your platform
(only for PyGObject, you don't need cairo or GTK).
The library is known to work with Python 3.8, PyGObject 3.34 and GLib 2.63, but these are not the required minimal versions.
Installation
Install the package from PyPI. Follow the instructions above to install the required dependencies.
pip3 install dasbus
Or install the RPM package on Fedora 31+.
sudo dnf install python3-dasbus
Or install the DEB package on Ubuntu 22.04+ and Debian 11+.
sudo apt install python3-dasbus
Examples
Show the current hostname.
from dasbus.connection import SystemMessageBus
bus = SystemMessageBus()
proxy = bus.get_proxy(
"org.freedesktop.hostname1",
"/org/freedesktop/hostname1"
)
print(proxy.Hostname)Send a notification to the notification server.
from dasbus.connection import SessionMessageBus
bus = SessionMessageBus()
proxy = bus.get_proxy(
"org.freedesktop.Notifications",
"/org/freedesktop/Notifications"
)
id = proxy.Notify(
"", 0, "face-smile", "Hello World!",
"This notification can be ignored.",
[], {}, 0
)
print("The notification {} was sent.".format(id))Handle a closed notification.
from dasbus.loop import EventLoop
loop = EventLoop()
from dasbus.connection import SessionMessageBus
bus = SessionMessageBus()
proxy = bus.get_proxy(
"org.freedesktop.Notifications",
"/org/freedesktop/Notifications"
)
def callback(id, reason):
print("The notification {} was closed.".format(id))
proxy.NotificationClosed.connect(callback)
loop.run()Asynchronously fetch a list of network devices.
from dasbus.loop import EventLoop
loop = EventLoop()
from dasbus.connection import SystemMessageBus
bus = SystemMessageBus()
proxy = bus.get_proxy(
"org.freedesktop.NetworkManager",
"/org/freedesktop/NetworkManager"
)
def callback(call):
print(call())
proxy.GetDevices(callback=callback)
loop.run()Inhibit the system suspend and hibernation.
import os
from dasbus.connection import SystemMessageBus
from dasbus.unix import GLibClientUnix
bus = SystemMessageBus()
proxy = bus.get_proxy(
"org.freedesktop.login1",
"/org/freedesktop/login1",
client=GLibClientUnix
)
fd = proxy.Inhibit(
"sleep", "my-example", "Running an example", "block"
)
proxy.ListInhibitors()
os.close(fd)Define the org.example.HelloWorld service.
class HelloWorld(object):
__dbus_xml__ = """
<node>
<interface name="org.example.HelloWorld">
<method name="Hello">
<arg direction="in" name="name" type="s" />
<arg direction="out" name="return" type="s" />
</method>
</interface>
</node>
"""
def Hello(self, name):
return "Hello {}!".format(name)Define the org.example.HelloWorld service with an automatically generated XML specification.
from dasbus.server.interface import dbus_interface
from dasbus.typing import Str
@dbus_interface("org.example.HelloWorld")
class HelloWorld(object):
def Hello(self, name: Str) -> Str:
return "Hello {}!".format(name)
print(HelloWorld.__dbus_xml__)Publish the org.example.HelloWorld service on the session message bus.
from dasbus.connection import SessionMessageBus
bus = SessionMessageBus()
bus.publish_object("/org/example/HelloWorld", HelloWorld())
bus.register_service("org.example.HelloWorld")
from dasbus.loop import EventLoop
loop = EventLoop()
loop.run()See more examples in the documentation.
Inspiration
Look at the complete examples or DBus services of the Anaconda Installer for more inspiration.