sugar-toolkit-gtk3/sugar/presence/presenceservice.py

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"""UI class to access system-level presence object"""
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# Copyright (C) 2007, Red Hat, Inc.
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#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import logging
import dbus
import dbus.exceptions
import dbus.glib
import gobject
from sugar.presence.buddy import Buddy
from sugar.presence.activity import Activity
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DBUS_SERVICE = "org.laptop.Sugar.Presence"
DBUS_INTERFACE = "org.laptop.Sugar.Presence"
DBUS_PATH = "/org/laptop/Sugar/Presence"
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_logger = logging.getLogger('sugar.presence.presenceservice')
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class PresenceService(gobject.GObject):
"""UI-side interface to the dbus presence service
This class provides UI programmers with simplified access
to the dbus service of the same name. It allows for observing
various events from the presence service as GObject events,
as well as some basic introspection queries.
"""
__gsignals__ = {
'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
# parameters: (activity: Activity, inviter: Buddy, message: unicode)
'activity-invitation': (gobject.SIGNAL_RUN_FIRST, None, ([object]*3)),
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'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
gobject.TYPE_PYOBJECT])),
'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'activity-shared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
gobject.TYPE_PYOBJECT]))
}
_PS_BUDDY_OP = DBUS_PATH + "/Buddies/"
_PS_ACTIVITY_OP = DBUS_PATH + "/Activities/"
def __init__(self, allow_offline_iface=True):
"""Initialise the service and attempt to connect to events
"""
gobject.GObject.__init__(self)
self._objcache = {}
self._joined = None
# Get a connection to the session bus
self._bus = dbus.SessionBus()
self._bus.add_signal_receiver(self._name_owner_changed_cb,
signal_name="NameOwnerChanged",
dbus_interface="org.freedesktop.DBus")
# attempt to load the interface to the service...
self._allow_offline_iface = allow_offline_iface
self._get_ps()
def _name_owner_changed_cb(self, name, old, new):
if name != DBUS_SERVICE:
return
if (old and len(old)) and (not new and not len(new)):
# PS went away, clear out PS dbus service wrapper
self._ps_ = None
elif (not old and not len(old)) and (new and len(new)):
# PS started up
self._get_ps()
_ps_ = None
def _get_ps(self):
"""Retrieve dbus interface to PresenceService
Also registers for updates from various dbus events on the
interface.
If unable to retrieve the interface, we will temporarily
return an _OfflineInterface object to allow the calling
code to continue functioning as though it had accessed a
real presence service.
If successful, caches the presence service interface
for use by other methods and returns that interface
"""
if not self._ps_:
try:
# NOTE: We need to follow_name_owner_changes here
# because we can not connect to a signal unless
# we follow the changes or we start the service
# before we connect. Starting the service here
# causes a major bottleneck during startup
ps = dbus.Interface(
self._bus.get_object(DBUS_SERVICE,
DBUS_PATH,
follow_name_owner_changes=True),
DBUS_INTERFACE
)
except dbus.exceptions.DBusException, err:
_logger.error(
"""Failure retrieving %r interface from
the D-BUS service %r %r: %s""",
DBUS_INTERFACE, DBUS_SERVICE, DBUS_PATH, err
)
if self._allow_offline_iface:
return _OfflineInterface()
raise RuntimeError("Failed to connect to the presence service.")
else:
self._ps_ = ps
ps.connect_to_signal('BuddyAppeared',
self._buddy_appeared_cb)
ps.connect_to_signal('BuddyDisappeared',
self._buddy_disappeared_cb)
ps.connect_to_signal('ActivityAppeared',
self._activity_appeared_cb)
ps.connect_to_signal('ActivityDisappeared',
self._activity_disappeared_cb)
ps.connect_to_signal('ActivityInvitation',
self._activity_invitation_cb)
ps.connect_to_signal('PrivateInvitation',
self._private_invitation_cb)
return self._ps_
_ps = property(
_get_ps, None, None,
"""DBUS interface to the PresenceService
(services/presence/presenceservice)"""
)
def _new_object(self, object_path):
"""Turn new object path into (cached) Buddy/Activity instance
object_path -- full dbus path of the new object, must be
prefixed with either of _PS_BUDDY_OP or _PS_ACTIVITY_OP
Note that this method is called throughout the class whenever
the representation of the object is required, it is not only
called when the object is first discovered. The point is to only have
_one_ Python object for any D-Bus object represented by an object path,
effectively wrapping the D-Bus object in a single Python GObject.
returns presence Buddy or Activity representation
"""
obj = None
try:
obj = self._objcache[object_path]
_logger.debug('Reused proxy %r', obj)
except KeyError:
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if object_path.startswith(self._PS_BUDDY_OP):
obj = Buddy(self._bus, self._new_object,
self._del_object, object_path)
elif object_path.startswith(self._PS_ACTIVITY_OP):
obj = Activity(self._bus, self._new_object,
self._del_object, object_path)
try:
# Pre-fill the activity's ID
foo = obj.props.id
except dbus.exceptions.DBusException:
logging.debug('Cannot get the activity ID')
else:
raise RuntimeError("Unknown object type")
self._objcache[object_path] = obj
_logger.debug('Created proxy %r', obj)
return obj
def _have_object(self, object_path):
return object_path in self._objcache.keys()
def _del_object(self, object_path):
"""Fully remove an object from the object cache when
it's no longer needed.
"""
del self._objcache[object_path]
def _emit_buddy_appeared_signal(self, object_path):
"""Emit GObject event with presence.buddy.Buddy object"""
self.emit('buddy-appeared', self._new_object(object_path))
return False
def _buddy_appeared_cb(self, op):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_buddy_appeared_signal, op)
def _emit_buddy_disappeared_signal(self, object_path):
"""Emit GObject event with presence.buddy.Buddy object"""
# Don't try to create a new object here if needed; it will probably
# fail anyway because the object has already been destroyed in the PS
if self._have_object(object_path):
obj = self._objcache[object_path]
self.emit('buddy-disappeared', obj)
# We cannot maintain the object in the cache because that would keep
# a lot of objects from being collected. That includes UI objects
# due to signals using strong references.
# If we want to cache some despite the memory usage increase,
# we could use a LRU cache limited to some value.
del self._objcache[object_path]
obj.destroy()
return False
def _buddy_disappeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_buddy_disappeared_signal, object_path)
def _emit_activity_invitation_signal(self, activity_path, buddy_path,
message):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-invitation', self._new_object(activity_path),
self._new_object(buddy_path), unicode(message))
return False
def _activity_invitation_cb(self, activity_path, buddy_path, message):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_invitation_signal, activity_path,
buddy_path, message)
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def _emit_private_invitation_signal(self, bus_name, connection, channel):
"""Emit GObject event with bus_name, connection and channel"""
self.emit('private-invitation', bus_name, connection, channel)
return False
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def _private_invitation_cb(self, bus_name, connection, channel):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_private_invitation_signal, bus_name,
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connection, channel)
def _emit_activity_appeared_signal(self, object_path):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-appeared', self._new_object(object_path))
return False
def _activity_appeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_appeared_signal, object_path)
def _emit_activity_disappeared_signal(self, object_path):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-disappeared', self._new_object(object_path))
return False
def _activity_disappeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_disappeared_signal, object_path)
def get(self, object_path):
"""Return the Buddy or Activity object corresponding to the given
D-Bus object path.
"""
return self._new_object(object_path)
def get_activities(self):
"""Retrieve set of all activities from service
returns list of Activity objects for all object paths
the service reports exist (using GetActivities)
"""
try:
resp = self._ps.GetActivities()
except dbus.exceptions.DBusException, err:
_logger.warn(
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"""Unable to retrieve activity list from presence service: %s"""
% err
)
return []
else:
acts = []
for item in resp:
acts.append(self._new_object(item))
return acts
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def _get_activities_cb(self, reply_handler, resp):
acts = []
for item in resp:
acts.append(self._new_object(item))
reply_handler(acts)
def _get_activities_error_cb(self, error_handler, e):
if error_handler:
error_handler(e)
else:
_logger.warn(
"""Unable to retrieve activity-list from presence service: %s"""
% e
)
def get_activities_async(self, reply_handler=None, error_handler=None):
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"""Retrieve set of all activities from service asyncronously
"""
if not reply_handler:
logging.error('Function get_activities_async called without' \
'a reply handler. Can not run.')
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return
self._ps.GetActivities(
reply_handler=lambda resp: \
self._get_activities_cb(reply_handler, resp),
error_handler=lambda e: \
self._get_activities_error_cb(error_handler, e))
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def get_activity(self, activity_id, warn_if_none=True):
"""Retrieve single Activity object for the given unique id
activity_id -- unique ID for the activity
returns single Activity object or None if the activity
is not found using GetActivityById on the service
"""
try:
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act_op = self._ps.GetActivityById(activity_id)
except dbus.exceptions.DBusException, err:
if warn_if_none:
_logger.warn("Unable to retrieve activity handle for %r from "
"presence service: %s", activity_id, err)
return None
return self._new_object(act_op)
def get_buddies(self):
"""Retrieve set of all buddies from service
returns list of Buddy objects for all object paths
the service reports exist (using GetBuddies)
"""
try:
resp = self._ps.GetBuddies()
except dbus.exceptions.DBusException, err:
_logger.warn(
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"""Unable to retrieve buddy-list from presence service: %s"""
% err
)
return []
else:
buddies = []
for item in resp:
buddies.append(self._new_object(item))
return buddies
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def _get_buddies_cb(self, reply_handler, resp):
buddies = []
for item in resp:
buddies.append(self._new_object(item))
reply_handler(buddies)
def _get_buddies_error_cb(self, error_handler, e):
if error_handler:
error_handler(e)
else:
_logger.warn(
"""Unable to retrieve buddy-list from presence service: %s"""
% e
)
def get_buddies_async(self, reply_handler=None, error_handler=None):
"""Retrieve set of all buddies from service asyncronously
"""
if not reply_handler:
logging.error('Function get_buddies_async called without' \
'a reply handler. Can not run.')
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return
self._ps.GetBuddies(
reply_handler=lambda resp: \
self._get_buddies_cb(reply_handler, resp),
error_handler=lambda e: \
self._get_buddies_error_cb(error_handler, e))
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def get_buddy(self, key):
"""Retrieve single Buddy object for the given public key
key -- buddy's public encryption key
returns single Buddy object or None if the activity
is not found using GetBuddyByPublicKey on the
service
"""
try:
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buddy_op = self._ps.GetBuddyByPublicKey(dbus.ByteArray(key))
except dbus.exceptions.DBusException, err:
_logger.warn(
"""Unable to retrieve buddy handle
for %r from presence service: %s"""
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% key, err
)
return None
return self._new_object(buddy_op)
def get_buddy_by_telepathy_handle(self, tp_conn_name, tp_conn_path,
handle):
"""Retrieve single Buddy object for the given public key
:Parameters:
`tp_conn_name` : str
The well-known bus name of a Telepathy connection
`tp_conn_path` : dbus.ObjectPath
The object path of the Telepathy connection
`handle` : int or long
The handle of a Telepathy contact on that connection,
of type HANDLE_TYPE_CONTACT. This may not be a
channel-specific handle.
:Returns: the Buddy object, or None if the buddy is not found
"""
try:
buddy_op = self._ps.GetBuddyByTelepathyHandle(tp_conn_name,
tp_conn_path,
handle)
except dbus.exceptions.DBusException, err:
_logger.warn('Unable to retrieve buddy handle for handle %u at '
'conn %s:%s from presence service: %s',
handle, tp_conn_name, tp_conn_path, err)
return None
return self._new_object(buddy_op)
def get_owner(self):
"""Retrieves the laptop "owner" Buddy object."""
try:
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owner_op = self._ps.GetOwner()
except dbus.exceptions.DBusException, err:
_logger.warn(
"""Unable to retrieve local user/owner
from presence service: %s"""
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% err
)
raise RuntimeError("Could not get owner object.")
return self._new_object(owner_op)
def _share_activity_cb(self, activity, op):
"""Finish sharing the activity
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"""
psact = self._new_object(op)
psact._joined = True
_logger.debug('%r: Just shared, setting up tubes', activity)
psact.set_up_tubes(reply_handler=lambda:
self.emit("activity-shared", True, psact, None),
error_handler=lambda e:
self._share_activity_error_cb(activity, e))
def _share_activity_error_cb(self, activity, err):
"""Notify with GObject event of unsuccessful sharing of activity"""
_logger.debug("Error sharing activity %s: %s" %
(activity.get_id(), err))
self.emit("activity-shared", False, None, err)
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def share_activity(self, activity, properties={}, private=True):
"""Ask presence service to ask the activity to share itself publicly.
Uses the AdvertiseActivity method on the service to ask for the
sharing of the given activity. Arranges to emit activity-shared
event with:
(success, Activity, err)
on success/failure.
returns None
"""
actid = activity.get_id()
# Ensure the activity is not already shared/joined
for obj in self._objcache.values():
if not isinstance(object, Activity):
continue
if obj.props.id == actid or obj.props.joined:
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raise RuntimeError("Activity %s is already shared." %
actid)
atype = activity.get_bundle_id()
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name = activity.props.title
properties['private'] = bool(private)
self._ps.ShareActivity(actid, atype, name, properties,
reply_handler=lambda op: \
self._share_activity_cb(activity, op),
error_handler=lambda e: \
self._share_activity_error_cb(activity, e))
def get_preferred_connection(self):
"""Gets the preferred telepathy connection object that an activity
should use when talking directly to telepathy
returns the bus name and the object path of the Telepathy connection"""
try:
bus_name, object_path = self._ps.GetPreferredConnection()
except dbus.exceptions.DBusException:
return None
return bus_name, object_path
class _OfflineInterface( object ):
"""Offline-presence-service interface
Used to mimic the behaviour of a real PresenceService sufficiently
to avoid crashing client code that expects the given interface.
XXX we could likely return a "MockOwner" object reasonably
easily, but would it be worth it?
"""
def raiseException( self, *args, **named ):
"""Raise dbus.exceptions.DBusException"""
raise dbus.exceptions.DBusException(
"""PresenceService Interface not available"""
)
GetActivities = raiseException
GetActivityById = raiseException
GetBuddies = raiseException
GetBuddyByPublicKey = raiseException
GetOwner = raiseException
GetPreferredConnection = raiseException
def ShareActivity(
self, actid, atype, name, properties,
reply_handler, error_handler,
):
"""Pretend to share and fail..."""
exc = IOError(
"""Unable to share activity as PresenceService
is not currenly available"""
)
return error_handler( exc )
class _MockPresenceService(gobject.GObject):
"""Test fixture allowing testing of items that use PresenceService
See PresenceService for usage and purpose
"""
__gsignals__ = {
'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'activity-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
gobject.TYPE_PYOBJECT])),
'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT]))
}
def __init__(self):
gobject.GObject.__init__(self)
def get_activities(self):
return []
def get_activity(self, activity_id):
return None
def get_buddies(self):
return []
def get_buddy(self, key):
return None
def get_owner(self):
return None
def share_activity(self, activity, properties={}):
return None
_ps = None
def get_instance(allow_offline_iface=False):
"""Retrieve this process' view of the PresenceService"""
global _ps
if not _ps:
_ps = PresenceService(allow_offline_iface)
return _ps