forked from platypush/platypush
87 lines
2.9 KiB
Python
87 lines
2.9 KiB
Python
|
from typing import Union
|
||
|
|
|
||
|
|
# noinspection PyPackageRequirements,PyUnresolvedReferences
|
||
|
|
from gi.repository import GLib
|
||
|
|
|
||
|
|
import dbus
|
||
|
|
import dbus.service
|
||
|
|
import dbus.mainloop.glib
|
||
|
|
|
||
|
|
from platypush.backend import Backend
|
||
|
|
from platypush.context import get_bus
|
||
|
|
from platypush.message import Message
|
||
|
|
from platypush.message.event import Event
|
||
|
|
from platypush.message.request import Request
|
||
|
|
from platypush.utils import run
|
||
|
|
|
||
|
|
|
||
|
|
# noinspection PyPep8Naming
|
||
|
|
class DBusService(dbus.service.Object):
|
||
|
|
@classmethod
|
||
|
|
def _parse_msg(cls, msg: Union[dict, list]):
|
||
|
|
import json
|
||
|
|
return Message.build(json.loads(json.dumps(msg)))
|
||
|
|
|
||
|
|
@dbus.service.method('org.platypush.MessageBusInterface', in_signature='a{sv}', out_signature='v')
|
||
|
|
def Post(self, msg: dict):
|
||
|
|
"""
|
||
|
|
This method accepts a message as a dictionary (either representing a valid request or an event) and either
|
||
|
|
executes it (request) or forwards it to the application bus (event).
|
||
|
|
|
||
|
|
:param msg: Request or event, as a dictionary.
|
||
|
|
:return: The return value of the request, or 0 if the message is an event.
|
||
|
|
"""
|
||
|
|
msg = self._parse_msg(msg)
|
||
|
|
if isinstance(msg, Request):
|
||
|
|
ret = run(msg.action, **msg.args)
|
||
|
|
if ret is None:
|
||
|
|
ret = '' # DBus doesn't like None return types
|
||
|
|
|
||
|
|
return ret
|
||
|
|
elif isinstance(msg, Event):
|
||
|
|
get_bus().post(msg)
|
||
|
|
return 0
|
||
|
|
|
||
|
|
|
||
|
|
class DbusBackend(Backend):
|
||
|
|
"""
|
||
|
|
This backend acts as a proxy that receives messages (requests or events) on the DBus and forwards them to the
|
||
|
|
application bus.
|
||
|
|
|
||
|
|
The name of the messaging interface exposed by Platypush is ``org.platypush.MessageBusInterface`` and it exposes
|
||
|
|
``Post`` method, which accepts a dictionary representing a valid Platypush message (either a request or an event)
|
||
|
|
and either executes it or forwards it to the application bus.
|
||
|
|
|
||
|
|
Requires:
|
||
|
|
|
||
|
|
* **dbus-python** (``pip install dbus-python``)
|
||
|
|
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, bus_name='org.platypush.Bus', service_path='/MessageService', *args, **kwargs):
|
||
|
|
"""
|
||
|
|
:param bus_name: Name of the bus where the application will listen for incoming messages (default:
|
||
|
|
``org.platypush.Bus``).
|
||
|
|
:param service_path: Path to the service exposed by the app (default: ``/MessageService``).
|
||
|
|
"""
|
||
|
|
super().__init__(*args, **kwargs)
|
||
|
|
self.bus_name = bus_name
|
||
|
|
self.service_path = service_path
|
||
|
|
|
||
|
|
def run(self):
|
||
|
|
super().run()
|
||
|
|
|
||
|
|
# noinspection PyUnresolvedReferences
|
||
|
|
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
|
||
|
|
bus = dbus.SessionBus()
|
||
|
|
name = dbus.service.BusName(self.bus_name, bus)
|
||
|
|
srv = DBusService(bus, self.service_path)
|
||
|
|
|
||
|
|
loop = GLib.MainLoop()
|
||
|
|
# noinspection PyProtectedMember
|
||
|
|
self.logger.info('Starting DBus main loop - bus name: {}, service: {}'.format(name._name, srv._object_path))
|
||
|
|
loop.run()
|
||
|
|
|
||
|
|
|
||
|
|
# vim:sw=4:ts=4:et:
|