thirdparty/google_appengine/google/appengine/api/datastore_admin.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 06 Dec 2008 16:52:21 +0000
changeset 686 df109be0567c
parent 149 f2e327a7c5de
child 2864 2e0b0af889be
permissions -rwxr-xr-x
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""The Python datastore admin API for managing indices and schemas.
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"""
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from google.appengine.api import api_base_pb
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from google.appengine.api import apiproxy_stub_map
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from google.appengine.api import datastore
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from google.appengine.api import datastore_errors
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from google.appengine.api import datastore_types
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from google.appengine.datastore import datastore_index
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from google.appengine.datastore import datastore_pb
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from google.appengine.runtime import apiproxy_errors
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from google.appengine.datastore import entity_pb
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_DIRECTION_MAP = {
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    'asc':        entity_pb.Index_Property.ASCENDING,
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    'ascending':  entity_pb.Index_Property.ASCENDING,
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    'desc':       entity_pb.Index_Property.DESCENDING,
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    'descending': entity_pb.Index_Property.DESCENDING,
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    }
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def GetSchema(_app=None):
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  """Infers an app's schema from the entities in the datastore.
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  Note that the PropertyValue PBs in the returned EntityProtos are empty
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  placeholders, so they may cause problems if you try to convert them to
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  python values with e.g. datastore_types. In particular, user values will
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  throw UserNotFoundError because their email and auth domain fields will be
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  empty.
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  Returns:
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    list of entity_pb.EntityProto, with kind and property names and types
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  """
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  req = api_base_pb.StringProto()
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  req.set_value(datastore_types.ResolveAppId(_app))
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  resp = datastore_pb.Schema()
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  _Call('GetSchema', req, resp)
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  return resp.kind_list()
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def GetIndices(_app=None):
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  """Fetches all composite indices in the datastore for this app.
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  Returns:
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    list of entity_pb.CompositeIndex
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  """
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  req = api_base_pb.StringProto()
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  req.set_value(datastore_types.ResolveAppId(_app))
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  resp = datastore_pb.CompositeIndices()
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  try:
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    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'GetIndices', req, resp)
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  except apiproxy_errors.ApplicationError, err:
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    raise datastore._ToDatastoreError(err)
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  return resp.index_list()
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def CreateIndex(index):
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  """Creates a new composite index in the datastore for this app.
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  Args:
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    index: entity_pb.CompositeIndex
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  Returns:
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    int, the id allocated to the index
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  """
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  resp = api_base_pb.Integer64Proto()
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  _Call('CreateIndex', index, resp)
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  return resp.value()
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def UpdateIndex(index):
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  """Updates an index's status. The entire index definition must be present.
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  Args:
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    index: entity_pb.CompositeIndex
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  """
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  _Call('UpdateIndex', index, api_base_pb.VoidProto())
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def DeleteIndex(index):
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  """Deletes an index. The entire index definition must be present.
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  Args:
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    index: entity_pb.CompositeIndex
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  """
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  _Call('DeleteIndex', index, api_base_pb.VoidProto())
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def _Call(call, req, resp):
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  """Generic method for making a datastore API call.
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  Args:
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    call: string, the name of the RPC call
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    req: the request PB. if the app_id field is not set, it defaults to the
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      local app.
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    resp: the response PB
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  """
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  if hasattr(req, 'app_id'):
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    req.set_app_id(datastore_types.ResolveAppId(req.app_id(), 'req.app_id()'))
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  try:
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    apiproxy_stub_map.MakeSyncCall('datastore_v3', call, req, resp)
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  except apiproxy_errors.ApplicationError, err:
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    raise datastore._ToDatastoreError(err)
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def IndexDefinitionToProto(app_id, index_definition):
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  """Transform individual Index definition to protocol buffer.
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  Args:
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    app_id: Application id for new protocol buffer CompositeIndex.
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    index_definition: datastore_index.Index object to transform.
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  Returns:
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    New entity_pb.CompositeIndex with default values set and index
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    information filled in.
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  """
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  proto = entity_pb.CompositeIndex()
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  proto.set_app_id(app_id)
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  proto.set_id(0)
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  proto.set_state(entity_pb.CompositeIndex.WRITE_ONLY)
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  definition_proto = proto.mutable_definition()
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  definition_proto.set_entity_type(index_definition.kind)
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  definition_proto.set_ancestor(index_definition.ancestor)
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  if index_definition.properties is not None:
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    for prop in index_definition.properties:
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      prop_proto = definition_proto.add_property()
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      prop_proto.set_name(prop.name)
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      prop_proto.set_direction(_DIRECTION_MAP[prop.direction])
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  return proto
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def IndexDefinitionsToProtos(app_id, index_definitions):
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  """Transform multiple index definitions to composite index records
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  Args:
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    app_id: Application id for new protocol buffer CompositeIndex.
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    index_definition: A list of datastore_index.Index objects to transform.
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  Returns:
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    A list of tranformed entity_pb.Compositeindex entities with default values
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    set and index information filled in.
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  """
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  return [IndexDefinitionToProto(app_id, index)
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          for index in index_definitions]
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def ProtoToIndexDefinition(proto):
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  """Transform individual index protocol buffer to index definition.
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  Args:
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    proto: An instance of entity_pb.CompositeIndex to transform.
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  Returns:
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    A new instance of datastore_index.Index.
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  """
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  properties = []
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  proto_index = proto.definition()
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  for prop_proto in proto_index.property_list():
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    prop_definition = datastore_index.Property(name=prop_proto.name())
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    if prop_proto.direction() == entity_pb.Index_Property.DESCENDING:
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      prop_definition.direction = 'descending'
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    properties.append(prop_definition)
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  index = datastore_index.Index(kind=proto_index.entity_type(),
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                                properties=properties)
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  if proto_index.ancestor():
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    index.ancestor = True
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  return index
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def ProtosToIndexDefinitions(protos):
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  """Transform multiple index protocol buffers to index definitions.
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  Args:
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    A list of entity_pb.Index records.
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  """
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  return [ProtoToIndexDefinition(definition) for definition in protos]