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lib
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python3.6
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site-packages
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slip
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dbus
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service.py
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# -*- coding: utf-8 -*- # slip.dbus.service -- convenience functions for using dbus-activated # services # # Copyright © 2008, 2009, 2015 Red Hat, Inc. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # # Authors: # Nils Philippsen <nils@redhat.com> "This module contains convenience functions for using dbus-activated services." from __future__ import absolute_import import dbus import dbus.service from six import with_metaclass from .._wrappers import _glib as GLib from . import polkit __all__ = ["Object", "InterfaceType", "set_mainloop"] __mainloop__ = None def __glib_quit_cb__(): global __mainloop__ # assume a Glib mainloop __mainloop__.quit() __quit_cb__ = __glib_quit_cb__ def set_mainloop(mainloop): global __mainloop__ __mainloop__ = mainloop def set_quit_cb(quit_cb): global __quit_cb__ __quit_cb__ = quit_cb def quit_cb(): global __quit_cb__ __quit_cb__() SENDER_KEYWORD = "__slip_dbus_service_sender__" ASYNC_CALLBACKS = ("__slip_dbus_service_reply_cb__", "__slip_dbus_service_error_cb__") def wrap_method(method): global SENDER_KEYWORD global ASYNC_CALLBACKS if method._dbus_sender_keyword is not None: sender_keyword = method._dbus_sender_keyword hide_sender_keyword = False else: sender_keyword = SENDER_KEYWORD hide_sender_keyword = True if method._dbus_async_callbacks is not None: async_callbacks = method._dbus_async_callbacks method_is_async = True else: async_callbacks = ASYNC_CALLBACKS method_is_async = False hide_async_callbacks = not method_is_async def wrapped_method(self, *p, **k): sender = k.get(sender_keyword) if sender is not None: # i.e. called over the bus, not locally reply_cb = k[async_callbacks[0]] error_cb = k[async_callbacks[1]] if hide_sender_keyword: del k[sender_keyword] if hide_async_callbacks: del k[async_callbacks[0]] del k[async_callbacks[1]] self.sender_seen(sender) action_id = getattr(method, "_slip_polkit_auth_required", getattr(self, "default_polkit_auth_required", None)) if sender is not None and action_id: def reply_handler(is_auth): if is_auth: if method_is_async: # k contains async callbacks, simply pass on reply_cb # and error_cb method(self, *p, **k) else: # execute the synchronous method ... error = None try: result = method(self, *p, **k) except Exception as e: error = e # ... and call the reply or error callback if error: error_cb(error) else: # reply_cb((None,)) != reply_cb() if result is None: reply_cb() else: reply_cb(result) else: error_cb(polkit.NotAuthorizedException(action_id)) self.timeout_restart() def error_handler(error): error_cb(error) self.timeout_restart() polkit.IsSystemBusNameAuthorizedAsync( sender, action_id, reply_handler=reply_handler, error_handler=error_handler) else: # no action id, or run locally, no need to do anything fancy retval = method(self, *p, **k) self.timeout_restart() return retval for attr in (x for x in dir(method) if x[:6] == "_dbus_"): if attr == "_dbus_sender_keyword": wrapped_method._dbus_sender_keyword = sender_keyword elif attr == "_dbus_async_callbacks": wrapped_method._dbus_async_callbacks = async_callbacks else: setattr(wrapped_method, attr, getattr(method, attr)) # delattr (method, attr) wrapped_method.__name__ = method.__name__ return wrapped_method class InterfaceType(dbus.service.InterfaceType): def __new__(cls, name, bases, dct): for (attrname, attr) in dct.items(): if getattr(attr, "_dbus_is_method", False): dct[attrname] = wrap_method(attr) return super(InterfaceType, cls).__new__(cls, name, bases, dct) class Object(with_metaclass(InterfaceType, dbus.service.Object)): # timeout & persistence persistent = False default_duration = 5 duration = default_duration current_source = None senders = set() connections_senders = {} connections_smobjs = {} # PolicyKit default_polkit_auth_required = None def __init__( self, conn=None, object_path=None, bus_name=None, persistent=None): super(Object, self).__init__(conn, object_path, bus_name) if persistent is None: self.persistent = self.__class__.persistent else: self.persistent = persistent def _timeout_cb(self): if not self.persistent and len(Object.senders) == 0: quit_cb() return False Object.current_source = None Object.duration = self.default_duration return False def _name_owner_changed(self, name, old_owner, new_owner): conn = self.connection if not new_owner and (old_owner, conn) in Object.senders: Object.senders.remove((old_owner, conn)) Object.connections_senders[conn].remove(old_owner) if len(Object.connections_senders[conn]) == 0: Object.connections_smobjs[conn].remove() del Object.connections_senders[conn] del Object.connections_smobjs[conn] if not self.persistent and len(Object.senders) == 0 and \ Object.current_source is None: quit_cb() def timeout_restart(self, duration=None): if not duration: duration = self.__class__.default_duration if not Object.duration or duration > Object.duration: Object.duration = duration if not self.persistent or len(Object.senders) == 0: if Object.current_source: GLib.source_remove(Object.current_source) Object.current_source = \ GLib.timeout_add(Object.duration * 1000, self._timeout_cb) def sender_seen(self, sender): if (sender, self.connection) not in Object.senders: Object.senders.add((sender, self.connection)) if self.connection not in Object.connections_senders: Object.connections_senders[self.connection] = set() Object.connections_smobjs[self.connection] = \ self.connection.add_signal_receiver( handler_function=self._name_owner_changed, signal_name='NameOwnerChanged', dbus_interface='org.freedesktop.DBus', arg1=sender) Object.connections_senders[self.connection].add(sender)