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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.
"""
STABLE.
"""
import logging
import time
from datetime import datetime
import os
import gobject
from sugar.datastore import dbus_helpers
from sugar import mime
from sugar import dispatch
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 = ['bundle_id', '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):
return self._props.get(key, default)
def update(self, d) :
for (k,v) in d.items() :
self[k] = v
class DSObject(object):
def __init__(self, tree_id, version_id, metadata=None, file_path=None):
self.tree_id = tree_id
self.version_id = version_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 self.tree_id is not None:
metadata = DSMetadata(get_properties((self.tree_id, self.version_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 self.tree_id is not None:
self.set_file_path(dbus_helpers.get_data(self.tree_id, self.version_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_object_id(self) :
if self.tree_id is None and self.version_id is None :
return None
return (self.tree_id, self.version_id)
def set_object_id(self, object_id) :
self.tree_id, self.version_id = object_id or (None, None)
object_id = property(get_object_id, set_object_id)
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)
def get(object_id):
logging.debug('datastore.get %r' % (object_id,))
tree_id, version_id = object_id
metadata = dbus_helpers.find({'tree_id': tree_id,
'version_id': version_id}, {})[0]
ds_object = DSObject(tree_id, version_id, DSMetadata(metadata), None)
# TODO: register the object for updates
return ds_object
def create():
metadata = DSMetadata()
return DSObject(tree_id=None, version_id=None, metadata=metadata, file_path=None)
def write(ds_object, transfer_ownership=False,
reply_handler=None, error_handler=None, timeout=-1):
logging.debug('datastore.write')
metadata = ds_object.metadata.get_dictionary()
file_path = ds_object.get_file_path(fetch=False)
if file_path is None:
file_path = ''
ds_object.object_id = dbus_helpers.save(ds_object.tree_id,
ds_object.version_id, metadata, file_path, transfer_ownership,
reply_handler=reply_handler, error_handler=error_handler,
timeout=timeout)
ds_object.metadata['tree_id'] = ds_object.tree_id
ds_object.metadata['version_id'] = ds_object.version_id
# TODO: register the object for updates
logging.debug('Written object %r to the datastore.', ds_object.object_id)
def write_metadata(ds_object) :
dbus_helpers.change_metadata(ds_object.tree_id, ds_object.version_id,
ds_object.metadata.get_dictionary())
def delete(object_id):
logging.debug('datastore.delete %r', object_id)
tree_id, version_id = object_id
dbus_helpers.delete(tree_id, version_id)
def get_metadata(object_id, metadata_names=[]) :
tree_id, version_id = object_id
res = find({'tree_id': tree_id, 'version_id': version_id})
return (res and res[0]) or None
def find(query, options={}, sorting=None, limit=None, offset=None, properties=None,
reply_handler=None, error_handler=None):
query = query.copy()
options = options.copy()
querystring = query.pop('query', '')
if properties:
options['metadata'] = properties
if sorting:
options['sort'] = sorting
if limit:
options['limit'] = limit
if offset:
options['offset'] = offset
if querystring :
entries, total_count = dbus_helpers.textsearch(query, options,
reply_handler, error_handler)
else :
entries, total_count = dbus_helpers.find(query, options,
reply_handler, error_handler)
objects = [
DSObject(metadata['tree_id'], metadata['version_id'],
DSMetadata(metadata), None)
for metadata in entries]
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 complete_indexing():
return dbus_helpers.check_ready()
def get_unique_values(key):
return dbus_helpers.find_unique_values({}, key)
class DatastoreListener(object):
_sig_names = ['saved', 'changedMetadata', 'deleted', 'ready', 'stopped']
def __init__(self):
self._datastore = dbus_helpers._get_data_store()
self._signal_handlers = [
self._datastore.connect_to_signal(sig_name[0].upper()+sig_name[1:],
getattr(self, "__datastore_%s_cb" % (sig_name,)))
for sig_name in self._sig_names]
for sig_name in self._sig_names :
setattr(self, sig_name, dispatch.Signal())
def __del__(self) :
try :
for handler in self._signal_handlers :
handler.remove()
except :
# ignore errors during garbage collection - the signal handlers might
# have already been collected
pass
def __datastore_saved_cb(self, tree_id, version_id):
metadata = get_metadata((tree_id, version_id))
self.saved.send(self, metadata=metadata)
def __datastore_changedMetadata_cb(self, tree_id, version_id):
metadata = get_metadata((tree_id, version_id))
self.changedMetadata.send(self, metadata=metadata)
def __datastore_deleted_cb(self, tree_id, version_id):
self.deleted.send(self, object_id=(tree_id, version_id))
def __datastore_ready(self):
self.ready.send(self)
def __datastore_stopped(self):
self.stopped.send(self)
_datastore_listener = None
def get_datastore_listener() :
global _datastore_listener
if not _datastore_listener :
_datastore_listener = DatastoreListener()
return _datastore_listener
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