462 lines
18 KiB
Python
462 lines
18 KiB
Python
"""UI class to access system-level presence object"""
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# Copyright (C) 2007, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import dbus, dbus.glib, gobject
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import logging
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# XXX use absolute imports
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# from sugar.presence import buddy, activity
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# this *kind* of relative import is deprecated
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# with an explicit relative import slated to be
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# introduced (available in Python 2.5 with a __future__
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# import), that would read as:
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# from . import buddy, activity
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# see PEP: http://docs.python.org/whatsnew/pep-328.html
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import buddy
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from activity import Activity
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DBUS_SERVICE = "org.laptop.Sugar.Presence"
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DBUS_INTERFACE = "org.laptop.Sugar.Presence"
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DBUS_PATH = "/org/laptop/Sugar/Presence"
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class PresenceService(gobject.GObject):
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"""UI-side interface to the dbus presence service
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This class provides UI programmers with simplified access
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to the dbus service of the same name. It allows for observing
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various events from the presence service as GObject events,
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as well as some basic introspection queries.
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"""
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__gsignals__ = {
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'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'activity-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
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gobject.TYPE_PYOBJECT])),
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'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'activity-shared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
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gobject.TYPE_PYOBJECT]))
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}
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_PS_BUDDY_OP = DBUS_PATH + "/Buddies/"
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_PS_ACTIVITY_OP = DBUS_PATH + "/Activities/"
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def __init__(self, allow_offline_iface=True):
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"""Initialise the service and attempt to connect to events
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"""
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gobject.GObject.__init__(self)
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self._objcache = {}
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# Get a connection to the session bus
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self._bus = dbus.SessionBus()
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self._bus.add_signal_receiver(self._name_owner_changed_cb,
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signal_name="NameOwnerChanged",
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dbus_interface="org.freedesktop.DBus")
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# attempt to load the interface to the service...
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self._allow_offline_iface = allow_offline_iface
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self._get_ps()
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def _name_owner_changed_cb(self, name, old, new):
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if name != DBUS_SERVICE:
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return
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if (old and len(old)) and (not new and not len(new)):
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# PS went away, clear out PS dbus service wrapper
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self._ps_ = None
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elif (not old and not len(old)) and (new and len(new)):
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# PS started up
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self._get_ps()
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_ps_ = None
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def _get_ps(self):
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"""Retrieve dbus interface to PresenceService
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Also registers for updates from various dbus events on the
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interface.
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If unable to retrieve the interface, we will temporarily
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return an _OfflineInterface object to allow the calling
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code to continue functioning as though it had accessed a
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real presence service.
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If successful, caches the presence service interface
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for use by other methods and returns that interface
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"""
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if not self._ps_:
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try:
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ps = dbus.Interface(
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self._bus.get_object(DBUS_SERVICE,DBUS_PATH),
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DBUS_INTERFACE
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)
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except dbus.exceptions.DBusException, err:
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logging.error(
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"""Failure retrieving %r interface from the D-BUS service %r %r: %s""",
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DBUS_INTERFACE, DBUS_SERVICE, DBUS_PATH, err
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)
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if self._allow_offline_iface:
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return _OfflineInterface()
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raise RuntimeError("Failed to connect to the presence service.")
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else:
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self._ps_ = ps
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ps.connect_to_signal('BuddyAppeared', self._buddy_appeared_cb)
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ps.connect_to_signal('BuddyDisappeared', self._buddy_disappeared_cb)
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ps.connect_to_signal('ActivityAppeared', self._activity_appeared_cb)
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ps.connect_to_signal('ActivityDisappeared', self._activity_disappeared_cb)
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ps.connect_to_signal('ActivityInvitation', self._activity_invitation_cb)
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ps.connect_to_signal('PrivateInvitation', self._private_invitation_cb)
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return self._ps_
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_ps = property(
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_get_ps, None, None,
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"""DBUS interface to the PresenceService (services/presence/presenceservice)"""
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)
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def _new_object(self, object_path):
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"""Turn new object path into (cached) Buddy/Activity instance
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object_path -- full dbus path of the new object, must be
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prefixed with either of _PS_BUDDY_OP or _PS_ACTIVITY_OP
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Note that this method is called throughout the class whenever
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the representation of the object is required, it is not only
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called when the object is first discovered. The point is to only have
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_one_ Python object for any D-Bus object represented by an object path,
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effectively wrapping the D-Bus object in a single Python GObject.
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returns presence Buddy or Activity representation
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"""
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obj = None
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try:
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obj = self._objcache[object_path]
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except KeyError:
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if object_path.startswith(self._PS_BUDDY_OP):
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obj = buddy.Buddy(self._bus, self._new_object,
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self._del_object, object_path)
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elif object_path.startswith(self._PS_ACTIVITY_OP):
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obj = Activity(self._bus, self._new_object,
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self._del_object, object_path)
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try:
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# Pre-fill the activity's ID
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foo = obj.props.id
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except dbus.exceptions.DBusException, err:
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pass
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else:
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raise RuntimeError("Unknown object type")
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self._objcache[object_path] = obj
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return obj
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def _del_object(self, object_path):
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"""Fully remove an object from the object cache when it's no longer needed.
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"""
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del self._objcache[object_path]
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def _emit_buddy_appeared_signal(self, object_path):
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"""Emit GObject event with presence.buddy.Buddy object"""
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self.emit('buddy-appeared', self._new_object(object_path))
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return False
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def _buddy_appeared_cb(self, op):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_buddy_appeared_signal, op)
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def _emit_buddy_disappeared_signal(self, object_path):
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"""Emit GObject event with presence.buddy.Buddy object"""
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self.emit('buddy-disappeared', self._new_object(object_path))
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return False
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def _buddy_disappeared_cb(self, object_path):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_buddy_disappeared_signal, object_path)
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def _emit_activity_invitation_signal(self, object_path):
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"""Emit GObject event with presence.activity.Activity object"""
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self.emit('activity-invitation', self._new_object(object_path))
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return False
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def _activity_invitation_cb(self, object_path):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_activity_invitation_signal, object_path)
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def _emit_private_invitation_signal(self, bus_name, connection, channel):
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"""Emit GObject event with bus_name, connection and channel"""
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self.emit('private-invitation', bus_name, connection, channel)
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return False
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def _private_invitation_cb(self, bus_name, connection, channel):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_service_disappeared_signal, bus_name,
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connection, channel)
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def _emit_activity_appeared_signal(self, object_path):
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"""Emit GObject event with presence.activity.Activity object"""
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self.emit('activity-appeared', self._new_object(object_path))
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return False
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def _activity_appeared_cb(self, object_path):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_activity_appeared_signal, object_path)
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def _emit_activity_disappeared_signal(self, object_path):
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"""Emit GObject event with presence.activity.Activity object"""
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self.emit('activity-disappeared', self._new_object(object_path))
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return False
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def _activity_disappeared_cb(self, object_path):
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"""Callback for dbus event (forwards to method to emit GObject event)"""
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gobject.idle_add(self._emit_activity_disappeared_signal, object_path)
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def get(self, object_path):
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"""Return the Buddy or Activity object corresponding to the given
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D-Bus object path.
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"""
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return self._new_object(object_path)
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def get_activities(self):
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"""Retrieve set of all activities from service
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returns list of Activity objects for all object paths
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the service reports exist (using GetActivities)
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"""
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try:
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resp = self._ps.GetActivities()
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except dbus.exceptions.DBusException, err:
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logging.warn(
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"""Unable to retrieve activity list from presence service: %s"""
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% err
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)
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return []
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else:
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acts = []
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for item in resp:
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acts.append(self._new_object(item))
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return acts
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def get_activity(self, activity_id):
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"""Retrieve single Activity object for the given unique id
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activity_id -- unique ID for the activity
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returns single Activity object or None if the activity
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is not found using GetActivityById on the service
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"""
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try:
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act_op = self._ps.GetActivityById(activity_id)
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except dbus.exceptions.DBusException, err:
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logging.warn(
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"""Unable to retrieve activity handle for %r from presence service: %s"""
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% (activity_id, err)
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)
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return None
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return self._new_object(act_op)
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def get_buddies(self):
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"""Retrieve set of all buddies from service
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returns list of Buddy objects for all object paths
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the service reports exist (using GetBuddies)
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"""
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try:
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resp = self._ps.GetBuddies()
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except dbus.exceptions.DBusException, err:
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logging.warn(
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"""Unable to retrieve buddy-list from presence service: %s"""
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% err
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)
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return []
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else:
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buddies = []
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for item in resp:
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buddies.append(self._new_object(item))
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return buddies
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def get_buddy(self, key):
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"""Retrieve single Buddy object for the given public key
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key -- buddy's public encryption key
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returns single Buddy object or None if the activity
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is not found using GetBuddyByPublicKey on the
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service
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"""
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try:
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buddy_op = self._ps.GetBuddyByPublicKey(dbus.ByteArray(key))
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except dbus.exceptions.DBusException, err:
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logging.warn(
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"""Unable to retrieve buddy handle for %r from presence service: %s"""
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% key, err
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)
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return None
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return self._new_object(buddy_op)
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def get_owner(self):
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"""Retrieves the laptop "owner" Buddy object."""
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try:
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owner_op = self._ps.GetOwner()
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except dbus.exceptions.DBusException, err:
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logging.warn(
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"""Unable to retrieve local user/owner from presence service: %s"""
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% err
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)
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raise RuntimeError("Could not get owner object from presence service.")
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return self._new_object(owner_op)
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def _share_activity_cb(self, activity, op):
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"""Notify with GObject event of successful sharing of activity"""
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psact = self._new_object(op)
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psact._joined = True
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self.emit("activity-shared", True, psact, None)
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def _share_activity_error_cb(self, activity, err):
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"""Notify with GObject event of unsuccessful sharing of activity"""
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logging.debug("Error sharing activity %s: %s" % (activity.get_id(), err))
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self.emit("activity-shared", False, None, err)
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def share_activity(self, activity, properties={}):
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"""Ask presence service to ask the activity to share itself
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Uses the ShareActivity method on the service to ask for the
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sharing of the given activity. Arranges to emit activity-shared
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event with:
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(success, Activity, err)
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on success/failure.
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returns None
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"""
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actid = activity.get_id()
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# Ensure the activity is not already shared/joined
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for obj in self._objcache.values():
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if not isinstance(object, Activity):
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continue
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if obj.props.id == actid or obj.props.joined:
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raise RuntimeError("Activity %s is already shared." % actid)
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atype = activity.get_service_name()
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name = activity.props.title
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self._ps.ShareActivity(actid, atype, name, properties,
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reply_handler=lambda *args: self._share_activity_cb(activity, *args),
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error_handler=lambda *args: self._share_activity_error_cb(activity, *args))
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def get_preferred_connection(self):
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"""Gets the preferred telepathy connection object that an activity
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should use when talking directly to telepathy
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returns the bus name and the object path of the Telepathy connection"""
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try:
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bus_name, object_path = self._ps.GetPreferredConnection()
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except dbus.exceptions.DBusException:
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return None
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return bus_name, object_path
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class _OfflineInterface( object ):
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"""Offline-presence-service interface
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Used to mimic the behaviour of a real PresenceService sufficiently
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to avoid crashing client code that expects the given interface.
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XXX we could likely return a "MockOwner" object reasonably
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easily, but would it be worth it?
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"""
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def raiseException( self, *args, **named ):
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"""Raise dbus.exceptions.DBusException"""
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raise dbus.exceptions.DBusException(
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"""PresenceService Interface not available"""
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)
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GetActivities = raiseException
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GetActivityById = raiseException
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GetBuddies = raiseException
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GetBuddyByPublicKey = raiseException
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GetOwner = raiseException
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GetPreferredConnection = raiseException
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def ShareActivity(
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self, actid, atype, name, properties,
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reply_handler, error_handler,
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):
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"""Pretend to share and fail..."""
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exc = IOError(
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"""Unable to share activity as PresenceService is not currenly available"""
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)
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return error_handler( exc )
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class _MockPresenceService(gobject.GObject):
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"""Test fixture allowing testing of items that use PresenceService
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See PresenceService for usage and purpose
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"""
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__gsignals__ = {
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'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'activity-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
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gobject.TYPE_PYOBJECT])),
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'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT])),
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'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT]))
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}
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def __init__(self):
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gobject.GObject.__init__(self)
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def get_activities(self):
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return []
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def get_activity(self, activity_id):
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return None
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def get_buddies(self):
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return []
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def get_buddy(self, key):
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return None
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def get_owner(self):
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return None
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def share_activity(self, activity, properties={}):
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return None
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_ps = None
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def get_instance(allow_offline_iface=False):
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"""Retrieve this process' view of the PresenceService"""
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global _ps
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if not _ps:
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_ps = PresenceService(allow_offline_iface)
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return _ps
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