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from inspect import ismethod
from dbus.service import method, signal
from dbus import PROPERTIES_IFACE
from dbus.exceptions import DBusException
from tuned.exports.dbus_exporter import DBusExporter
class DBusExporterWithProperties(DBusExporter):
def __init__(self, bus_name, interface_name, object_name, namespace):
super(DBusExporterWithProperties, self).__init__(bus_name, interface_name, object_name, namespace)
self._property_setters = {}
self._property_getters = {}
def Get(_, interface_name, property_name, caller):
if interface_name != self._interface_name:
raise DBusException("Unknown interface: %s" % interface_name)
if property_name not in self._property_getters:
raise DBusException("No such property: %s" % property_name)
getter = self._property_getters[property_name]
return getter(caller)
def Set(_, interface_name, property_name, value, caller):
if interface_name != self._interface_name:
raise DBusException("Unknown interface: %s" % interface_name)
if property_name not in self._property_setters:
raise DBusException("No such property: %s" % property_name)
setter = self._property_setters[property_name]
setter(value, caller)
def GetAll(_, interface_name, caller):
if interface_name != self._interface_name:
raise DBusException("Unknown interface: %s" % interface_name)
return {name: getter(caller) for name, getter in self._property_getters.items()}
def PropertiesChanged(_, interface_name, changed_properties, invalidated_properties):
if interface_name != self._interface_name:
raise DBusException("Unknown interface: %s" % interface_name)
self._dbus_methods["Get"] = method(PROPERTIES_IFACE, in_signature="ss", out_signature="v", sender_keyword="caller")(Get)
self._dbus_methods["Set"] = method(PROPERTIES_IFACE, in_signature="ssv", sender_keyword="caller")(Set)
self._dbus_methods["GetAll"] = method(PROPERTIES_IFACE, in_signature="s", out_signature="a{sv}", sender_keyword="caller")(GetAll)
self._dbus_methods["PropertiesChanged"] = signal(PROPERTIES_IFACE, signature="sa{sv}as")(PropertiesChanged)
self._signals.add("PropertiesChanged")
def _auth_wrapper(self, method, action_name):
def wrapper(*args, **kwargs):
new_args = self._polkit_auth(action_name, *args)
if new_args[-1] == "":
raise DBusException("Unauthorized")
return method(*new_args, **kwargs)
return wrapper
def property_changed(self, property_name, value):
self.send_signal("PropertiesChanged", self._interface_name, {property_name: value}, {})
def property_getter(self, method, property_name, action_name=None):
if not ismethod(method):
raise Exception("Only bound methods can be exported.")
if property_name in self._property_getters:
raise Exception("A getter for this property is already registered.")
if action_name is not None:
method = self._auth_wrapper(method, action_name)
self._property_getters[property_name] = method
def property_setter(self, method, property_name, action_name=None):
if not ismethod(method):
raise Exception("Only bound methods can be exported.")
if property_name in self._property_setters:
raise Exception("A setter for this property is already registered.")
if action_name is not None:
method = self._auth_wrapper(method, action_name)
self._property_setters[property_name] = method