/usr/share/pyshared/sugar/datastore/datastore.py is in python-sugar-toolkit-0.84 0.84.16-1build1.
This file is owned by root:root, with mode 0o644.
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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.
"""
STABLE.
"""
import logging
import time
from datetime import datetime
import os
import tempfile
import gobject
import gconf
import gio
import dbus
from sugar import env
from sugar.datastore import dbus_helpers
from sugar import mime
DS_DBUS_SERVICE = "org.laptop.sugar.DataStore"
DS_DBUS_INTERFACE = "org.laptop.sugar.DataStore"
DS_DBUS_PATH = "/org/laptop/sugar/DataStore"
_data_store = None
def _get_data_store():
global _data_store
if not _data_store:
_bus = dbus.SessionBus()
_data_store = dbus.Interface(_bus.get_object(DS_DBUS_SERVICE,
DS_DBUS_PATH),
DS_DBUS_INTERFACE)
return _data_store
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 __contains__(self, key):
return self._props.__contains__(key)
def has_key(self, key):
return self._props.has_key(key)
def keys(self):
return self._props.keys()
def get_dictionary(self):
return self._props
def copy(self):
return DSMetadata(self._props.copy())
def get(self, key, default=None):
if self._props.has_key(key):
return self._props[key]
else:
return default
def update(self, properties):
"""Update all of the metadata"""
for (key, value) in properties.items():
self[key] = value
class DSObject(object):
def __init__(self, object_id, metadata=None, file_path=None):
self._update_signal_match = None
self.set_object_id(object_id)
self._metadata = metadata
self._file_path = file_path
self._destroyed = False
self._owns_file = False
def get_object_id(self):
return self._object_id
def set_object_id(self, object_id):
if object_id is not None:
if self._update_signal_match is not None:
self._update_signal_match.remove()
self._update_signal_match = _get_data_store().connect_to_signal( \
'Updated', self.__object_updated_cb, arg0=object_id)
self._object_id = object_id
object_id = property(get_object_id, set_object_id)
def __object_updated_cb(self, object_id):
properties = _get_data_store().get_properties(self._object_id,
byte_arrays=True)
self._metadata.update(properties)
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, fetch=True):
if fetch and 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 destroy(self):
if self._destroyed:
logging.warning('This DSObject has already been destroyed!.')
return
self._destroyed = True
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 = None
def __del__(self):
if not self._destroyed:
logging.warning('DSObject was deleted without cleaning up first. ' \
'Call DSObject.destroy() before disposing it.')
self.destroy()
def copy(self):
return DSObject(None, self._metadata.copy(), self._file_path)
class RawObject(object):
def __init__(self, file_path):
stat = os.stat(file_path)
client = gconf.client_get_default()
metadata = {
'uid': file_path,
'title': os.path.basename(file_path),
'timestamp': stat.st_mtime,
'mime_type': gio.content_type_guess(filename=file_path),
'activity': '',
'activity_id': '',
'icon-color': client.get_string('/desktop/sugar/user/color'),
'description': file_path,
}
self.object_id = file_path
self._metadata = DSMetadata(metadata)
self._file_path = None
self._destroyed = False
def get_metadata(self):
return self._metadata
metadata = property(get_metadata)
def get_file_path(self, fetch=True):
# we have to create symlink since its a common practice
# to create hardlinks to jobject files
# and w/o this, it wouldn't work since we have file from mounted device
if self._file_path is None:
data_path = os.path.join(env.get_profile_path(), 'data')
self._file_path = tempfile.mktemp(prefix='rawobject',
dir=data_path)
if not os.path.exists(data_path):
os.makedirs(data_path)
os.symlink(self.object_id, self._file_path)
return self._file_path
file_path = property(get_file_path)
def destroy(self):
if self._destroyed:
logging.warning('This RawObject has already been destroyed!.')
return
self._destroyed = True
if self._file_path is not None:
if os.path.exists(self._file_path):
os.remove(self._file_path)
self._file_path = None
def __del__(self):
if not self._destroyed:
logging.warning('RawObject was deleted without cleaning up. '
'Call RawObject.destroy() before disposing it.')
self.destroy()
def get(object_id):
logging.debug('datastore.get')
if object_id.startswith('/'):
return RawObject(object_id)
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['mtime'] = datetime.now().isoformat()
metadata['timestamp'] = int(time.time())
return DSObject(object_id=None, metadata=metadata, file_path=None)
def write(ds_object, update_mtime=True, transfer_ownership=False,
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()
properties['timestamp'] = int(time.time())
file_path = ds_object.get_file_path(fetch=False)
if file_path is None:
file_path = ''
# FIXME: this func will be sync for creates regardless of the handlers
# supplied. This is very bad API, need to decide what to do here.
if ds_object.object_id:
dbus_helpers.update(ds_object.object_id,
properties,
file_path,
transfer_ownership,
reply_handler=reply_handler,
error_handler=error_handler,
timeout=timeout)
else:
if reply_handler or error_handler:
logging.warning('datastore.write() cannot currently be called' \
'async for creates, see ticket 3071')
ds_object.object_id = dbus_helpers.create(properties,
file_path,
transfer_ownership)
ds_object.metadata['uid'] = ds_object.object_id
# 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, properties=None,
reply_handler=None, error_handler=None):
query = query.copy()
if properties is None:
properties = []
if sorting:
query['order_by'] = sorting
if limit:
query['limit'] = limit
if offset:
query['offset'] = offset
props_list, total_count = dbus_helpers.find(query, properties,
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 copy(jobject, mount_point):
new_jobject = jobject.copy()
new_jobject.metadata['mountpoint'] = mount_point
if jobject.metadata.has_key('title'):
filename = jobject.metadata['title']
if jobject.metadata.has_key('mime_type'):
mime_type = jobject.metadata['mime_type']
extension = mime.get_primary_extension(mime_type)
if extension:
filename += '.' + extension
new_jobject.metadata['suggested_filename'] = filename
# this will cause the file be retrieved from the DS
new_jobject.file_path = jobject.file_path
write(new_jobject)
def mount(uri, options, timeout=-1):
return dbus_helpers.mount(uri, options, timeout=timeout)
def unmount(mount_point_id):
dbus_helpers.unmount(mount_point_id)
def mounts():
return dbus_helpers.mounts()
def complete_indexing():
return dbus_helpers.complete_indexing()
def get_unique_values(key):
return dbus_helpers.get_unique_values(key)
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