def _serialize_changes(self):
changes = {'object_id': self.object_id}
for key, old_value in self.old_values.items():
new_value = self[key]
if (
json_encode_extra(old_value) ==
json_encode_extra(new_value)
):
continue
if isinstance(old_value, MultiAttr):
action = 'multi'
else:
action = 'update'
change = {'action': action}
if action == 'update':
change['old'] = old_value
change['new'] = new_value
elif action == 'multi':
change['remove'] = old_value.difference(new_value)
change['add'] = new_value.difference(old_value)
changes[key] = change
return changes
def commit_state(self):
if self.object_id is None:
return 'created'
if self._deleted:
return 'deleted'
for attribute_id, old_value in self.old_values.items():
if (json_encode_extra(self[attribute_id]) !=
json_encode_extra(old_value)):
return 'changed'
return 'consistent'
def _validate_commit(changes, servers):
newer = []
for attribute_changes in changes:
object_id = attribute_changes['object_id']
server = servers[object_id]
for attr, change in attribute_changes.items():
if attr == 'object_id':
continue
action = change['action']
if action == 'new':
if attr in server:
newer.append((object_id, attr, server[attr]))
elif action == 'update' or action == 'delete':
try:
if json_encode_extra(server[attr]) != str(change['old']):
newer.append((object_id, attr, server[attr]))
except KeyError:
newer.append((object_id, attr, None))
return newer