"""Shell side object which manages request to start activity"""
# Copyright (C) 2006-2007 Red Hat, Inc.
#
# 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 gobject
import gtk
from sugar.presence import presenceservice
from sugar.activity.activityhandle import ActivityHandle
from sugar.datastore import datastore
from sugar import util
import os
_SHELL_SERVICE = "org.laptop.Shell"
_SHELL_PATH = "/org/laptop/Shell"
_SHELL_IFACE = "org.laptop.Shell"
_DS_SERVICE = "org.laptop.sugar.DataStore"
_DS_INTERFACE = "org.laptop.sugar.DataStore"
_DS_PATH = "/org/laptop/sugar/DataStore"
_ACTIVITY_FACTORY_INTERFACE = "org.laptop.ActivityFactory"
_RAINBOW_SERVICE_NAME = "org.laptop.security.Rainbow"
_RAINBOW_ACTIVITY_FACTORY_PATH = "/"
_RAINBOW_ACTIVITY_FACTORY_INTERFACE = "org.laptop.security.Rainbow"
def create_activity_id():
"""Generate a new, unique ID for this activity"""
pservice = presenceservice.get_instance()
# create a new unique activity ID
i = 0
act_id = None
while i < 10:
act_id = util.unique_id()
i += 1
# check through network activities
found = False
activities = pservice.get_activities()
for act in activities:
if act_id == act.props.id:
found = True
break
if not found:
return act_id
raise RuntimeError("Cannot generate unique activity id.")
class ActivityCreationHandler(gobject.GObject):
"""Sugar-side activity creation interface
This object uses a dbus method on the ActivityFactory
service to create the new activity. It generates
GObject events in response to the success/failure of
activity startup using callbacks to the service's
create call.
"""
def __init__(self, service_name, handle):
"""Initialise the handler
service_name -- the service name of the bundle factory
activity_handle -- stores the values which are to
be passed to the service to uniquely identify
the activity to be created and the sharing
service that may or may not be connected with it
sugar.activity.activityhandle.ActivityHandle instance
calls the "create" method on the service for this
particular activity type and registers the
_reply_handler and _error_handler methods on that
call's results.
The specific service which creates new instances of this
particular type of activity is created during the activity
registration process in shell bundle registry which creates
service definition files for each registered bundle type.
If the file '/etc/olpc-security' exists, then activity launching
will be delegated to the prototype 'Rainbow' security service.
"""
gobject.GObject.__init__(self)
self._service_name = service_name
self._handle = handle
bus = dbus.SessionBus()
bus_object = bus.get_object(_SHELL_SERVICE, _SHELL_PATH)
self._shell = dbus.Interface(bus_object, _SHELL_IFACE)
object_path = '/' + service_name.replace('.', '/')
proxy_obj = bus.get_object(service_name, object_path,
follow_name_owner_changes=True)
self._factory = dbus.Interface(proxy_obj, _ACTIVITY_FACTORY_INTERFACE)
if handle.activity_id is not None and \
handle.object_id is None:
datastore = dbus.Interface(
bus.get_object(_DS_SERVICE, _DS_PATH), _DS_INTERFACE)
datastore.find({ 'activity_id': self._handle.activity_id }, [],
reply_handler=self._find_object_reply_handler,
error_handler=self._find_object_error_handler)
else:
self._launch_activity()
def _launch_activity(self):
if self._handle.activity_id != None:
self._shell.ActivateActivity(self._handle.activity_id,
reply_handler=self._activate_reply_handler,
error_handler=self._activate_error_handler)
else:
self._create_activity()
def _create_activity(self):
if self._handle.activity_id is None:
self._handle.activity_id = create_activity_id()
self._shell.NotifyLaunch(
self._service_name, self._handle.activity_id,
reply_handler=self._no_reply_handler,
error_handler=self._notify_launch_error_handler)
if not os.path.exists('/etc/olpc-security'):
handle = self._handle.get_dict()
self._factory.create(dbus.Dictionary(handle, signature='ss'),
timeout=120 * 1000,
reply_handler=self._no_reply_handler,
error_handler=self._create_error_handler)
else:
system_bus = dbus.SystemBus()
factory = system_bus.get_object(_RAINBOW_SERVICE_NAME,
_RAINBOW_ACTIVITY_FACTORY_PATH)
factory.CreateActivity(
self._service_name,
self._handle.get_dict(),
timeout=120 * 1000,
reply_handler=self._create_reply_handler,
error_handler=self._create_error_handler,
dbus_interface=_RAINBOW_ACTIVITY_FACTORY_INTERFACE)
def _no_reply_handler(self, *args):
pass
def _notify_launch_failure_error_handler(self, err):
logging.error('Notify launch failure failed %s' % err)
def _notify_launch_error_handler(self, err):
logging.debug('Notify launch failed %s' % err)
def _activate_reply_handler(self, activated):
if not activated:
self._create_activity()
def _activate_error_handler(self, err):
logging.error("Activity activation request failed %s" % err)
def _create_reply_handler(self, xid):
logging.debug("Activity created %s (%s)." %
(self._handle.activity_id, self._service_name))
def _create_error_handler(self, err):
logging.error("Couldn't create activity %s (%s): %s" %
(self._handle.activity_id, self._service_name, err))
self._shell.NotifyLaunchFailure(
self._handle.activity_id, reply_handler=self._no_reply_handler,
error_handler=self._notify_launch_failure_error_handler)
def _find_object_reply_handler(self, jobjects, count):
if count > 0:
if count > 1:
logging.debug("Multiple objects has the same activity_id.")
self._handle.object_id = jobjects[0]['uid']
self._create_activity()
def _find_object_error_handler(self, err):
logging.error("Datastore find failed %s" % err)
self._create_activity()
def create(service_name, activity_handle=None):
"""Create a new activity from its name."""
if not activity_handle:
activity_handle = ActivityHandle()
return ActivityCreationHandler(service_name, activity_handle)
def create_with_uri(service_name, uri):
"""Create a new activity and pass the uri as handle."""
activity_handle = ActivityHandle(uri=uri)
return ActivityCreationHandler(service_name, activity_handle)
def create_with_object_id(service_name, object_id):
"""Create a new activity and pass the object id as handle."""
activity_handle = ActivityHandle(object_id=object_id)
return ActivityCreationHandler(service_name, activity_handle)