ok
Direktori : /proc/self/root/usr/lib/python2.7/site-packages/tuned/exports/ |
Current File : //proc/self/root/usr/lib/python2.7/site-packages/tuned/exports/dbus_exporter.py |
from . import interfaces import decorator import dbus.service import dbus.mainloop.glib import dbus.exceptions import inspect import threading import signal import tuned.logs import tuned.consts as consts from tuned.utils.polkit import polkit from gi.repository import GLib log = tuned.logs.get() class DBusExporter(interfaces.ExporterInterface): """ Export method calls through DBus Interface. We take a method to be exported and create a simple wrapper function to call it. This is required as we need the original function to be bound to the original object instance. While the wrapper will be bound to an object we dynamically construct. """ def __init__(self, bus_name, interface_name, object_name): dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) self._dbus_object_cls = None self._dbus_object = None self._dbus_methods = {} self._signals = set() self._bus_name = bus_name self._interface_name = interface_name self._object_name = object_name self._thread = None self._bus_object = None self._polkit = polkit() # dirty hack that fixes KeyboardInterrupt handling # the hack is needed because PyGObject / GTK+-3 developers are morons signal_handler = signal.getsignal(signal.SIGINT) self._main_loop = GLib.MainLoop() signal.signal(signal.SIGINT, signal_handler) @property def bus_name(self): return self._bus_name @property def interface_name(self): return self._interface_name @property def object_name(self): return self._object_name def running(self): return self._thread is not None def export(self, method, in_signature, out_signature): if not inspect.ismethod(method): raise Exception("Only bound methods can be exported.") method_name = method.__name__ if method_name in self._dbus_methods: raise Exception("Method with this name is already exported.") def wrapper(wrapped, owner, *args, **kwargs): action_id = consts.NAMESPACE + "." + method.__name__ caller = args[-1] log.debug("checking authorization for for action '%s' requested by caller '%s'" % (action_id, caller)) ret = self._polkit.check_authorization(caller, action_id) if ret == 1: log.debug("action '%s' requested by caller '%s' was successfully authorized by polkit" % (action_id, caller)) elif ret == 2: log.warn("polkit error, but action '%s' requested by caller '%s' was successfully authorized by fallback method" % (action_id, caller)) elif ret == 0: log.info("action '%s' requested by caller '%s' wasn't authorized, ignoring the request" % (action_id, caller)) args[-1] = "" elif ret == -1: log.warn("polkit error and action '%s' requested by caller '%s' wasn't authorized by fallback method, ignoring the request" % (action_id, caller)) args[-1] = "" else: log.error("polkit error and unable to use fallback method to authorize action '%s' requested by caller '%s', ignoring the request" % (action_id, caller)) args[-1] = "" return method(*args, **kwargs) wrapper = decorator.decorator(wrapper, method.__func__) wrapper = dbus.service.method(self._interface_name, in_signature, out_signature, sender_keyword = "caller")(wrapper) self._dbus_methods[method_name] = wrapper def signal(self, method, out_signature): if not inspect.ismethod(method): raise Exception("Only bound methods can be exported.") method_name = method.__name__ if method_name in self._dbus_methods: raise Exception("Method with this name is already exported.") def wrapper(wrapped, owner, *args, **kwargs): return method(*args, **kwargs) wrapper = decorator.decorator(wrapper, method.__func__) wrapper = dbus.service.signal(self._interface_name, out_signature)(wrapper) self._dbus_methods[method_name] = wrapper self._signals.add(method_name) def send_signal(self, signal, *args, **kwargs): err = False if not signal in self._signals or self._bus_object is None: err = True try: method = getattr(self._bus_object, signal) except AttributeError: err = True if err: raise Exception("Signal '%s' doesn't exist." % signal) else: method(*args, **kwargs) def _construct_dbus_object_class(self): if self._dbus_object_cls is not None: raise Exception("The exporter class was already build.") unique_name = "DBusExporter_%d" % id(self) cls = type(unique_name, (dbus.service.Object,), self._dbus_methods) self._dbus_object_cls = cls def start(self): if self.running(): return if self._dbus_object_cls is None: self._construct_dbus_object_class() self.stop() bus = dbus.SystemBus() bus_name = dbus.service.BusName(self._bus_name, bus) self._bus_object = self._dbus_object_cls(bus, self._object_name, bus_name) self._thread = threading.Thread(target=self._thread_code) self._thread.start() def stop(self): if self._thread is not None and self._thread.is_alive(): self._main_loop.quit() self._thread.join() self._thread = None def _thread_code(self): self._main_loop.run() del self._bus_object self._bus_object = None