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# Copyright (C) 2007, One Laptop Per Child
#
# 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
from datetime import datetime
import os
import gobject
from sugar.datastore import dbus_helpers
from sugar import activity
from sugar.activity.bundle import Bundle
from sugar.activity import activityfactory
from sugar.activity.activityhandle import ActivityHandle
class DSMetadata(gobject.GObject):
__gsignals__ = {
'updated': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([]))
}
def __init__(self, props=None):
gobject.GObject.__init__(self)
if not props:
self._props = {}
else:
self._props = props
default_keys = ['activity', 'activity_id',
'mime_type', 'title_set_by_user']
for key in default_keys:
if not self._props.has_key(key):
self._props[key] = ''
def __getitem__(self, key):
return self._props[key]
def __setitem__(self, key, value):
if not self._props.has_key(key) or self._props[key] != value:
self._props[key] = value
self.emit('updated')
def __delitem__(self, key):
del self._props[key]
def has_key(self, key):
return self._props.has_key(key)
def get_dictionary(self):
return self._props
class DSObject(object):
def __init__(self, object_id, metadata=None, file_path=None):
self.object_id = object_id
self._metadata = metadata
self._file_path = file_path
self._destroyed = False
self._owns_file = False
def get_metadata(self):
if self._metadata is None and not self.object_id is None:
metadata = DSMetadata(dbus_helpers.get_properties(self.object_id))
self._metadata = metadata
return self._metadata
def set_metadata(self, metadata):
if self._metadata != metadata:
self._metadata = metadata
metadata = property(get_metadata, set_metadata)
def get_file_path(self):
if self._file_path is None and not self.object_id is None:
self.set_file_path(dbus_helpers.get_filename(self.object_id))
self._owns_file = True
return self._file_path
def set_file_path(self, file_path):
if self._file_path != file_path:
if self._file_path and self._owns_file:
if os.path.isfile(self._file_path):
os.remove(self._file_path)
self._owns_file = False
self._file_path = file_path
file_path = property(get_file_path, set_file_path)
def get_activities(self):
activities = []
if self.metadata['activity']:
activity_info = activity.get_registry().get_activity(self.metadata['activity'])
activities.append(activity_info)
mime_type = self.metadata['mime_type']
if mime_type:
activities_info = activity.get_registry().get_activities_for_type(mime_type)
for activity_info in activities_info:
if activity_info.service_name != self.metadata['activity']:
activities.append(activity_info)
return activities
def is_bundle(self):
return self.metadata['mime_type'] == 'application/vnd.olpc-x-sugar'
def resume(self, service_name=None):
if self.is_bundle():
bundle = Bundle(self.file_path)
if not bundle.is_installed():
bundle.install()
activityfactory.create(bundle.get_service_name())
else:
if service_name is None:
service_name = self.get_activities()[0].service_name
activity_id = self.metadata['activity_id']
object_id = self.object_id
if activity_id:
handle = ActivityHandle(object_id=object_id,
activity_id=activity_id)
activityfactory.create(service_name, handle)
else:
activityfactory.create_with_object_id(service_name, object_id)
def destroy(self):
logging.debug('DSObject.destroy() file_path: %r.' % self._file_path)
if self._destroyed:
logging.warning('This DSObject has already been destroyed!.')
import pdb;pdb.set_trace()
return
self._destroyed = True
if self._file_path and self._owns_file:
logging.debug('Removing temp file: %r' % self._file_path)
if os.path.isfile(self._file_path):
os.remove(self._file_path)
self._owns_file = False
self._file_path = None
def __del__(self):
if not self._destroyed:
logging.warning('DSObject was deleted without cleaning up first. ' \
'Please call DSObject.destroy() before disposing it.')
self.destroy()
def get(object_id):
logging.debug('datastore.get')
metadata = dbus_helpers.get_properties(object_id)
ds_object = DSObject(object_id, DSMetadata(metadata), None)
# TODO: register the object for updates
return ds_object
def create():
metadata = DSMetadata()
metadata['ctime'] = datetime.now().isoformat()
metadata['mtime'] = metadata['ctime']
return DSObject(object_id=None, metadata=metadata, file_path=None)
def write(ds_object, update_mtime=True, reply_handler=None, error_handler=None, timeout=-1):
logging.debug('datastore.write')
properties = ds_object.metadata.get_dictionary().copy()
if update_mtime:
properties['mtime'] = datetime.now().isoformat()
if ds_object.object_id:
dbus_helpers.update(ds_object.object_id,
properties,
ds_object.file_path,
reply_handler=reply_handler,
error_handler=error_handler,
timeout=timeout)
else:
ds_object.object_id = dbus_helpers.create(properties,
ds_object.file_path)
# TODO: register the object for updates
logging.debug('Written object %s to the datastore.' % ds_object.object_id)
def delete(object_id):
logging.debug('datastore.delete')
dbus_helpers.delete(object_id)
def find(query, sorting=None, limit=None, offset=None, reply_handler=None,
error_handler=None):
query = query.copy()
if sorting:
query['order_by'] = sorting
if limit:
query['limit'] = limit
if offset:
query['offset'] = offset
props_list, total_count = dbus_helpers.find(query, reply_handler, error_handler)
objects = []
for props in props_list:
object_id = props['uid']
del props['uid']
ds_object = DSObject(object_id, DSMetadata(props), None)
objects.append(ds_object)
return objects, total_count
def mount(uri, options):
return dbus_helpers.mount(uri, options)
def unmount(mount_point_id):
dbus_helpers.unmount(mount_point_id)
def mounts():
return dbus_helpers.mounts()
def get_unique_values(key):
return dbus_helpers.get_unique_values(key)
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