src/google/appengine/datastore/datastore_rpc.py [2826:2844]:
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  if not datastore_pbs._CLOUD_DATASTORE_ENABLED:
    raise datastore_errors.BadArgumentError(
        datastore_pbs.MISSING_CLOUD_DATASTORE_MESSAGE)

  current_app_id = full_app_id.get()
  if current_app_id and current_app_id != app_id:


    raise ValueError('Cannot create a Cloud Datastore context that connects '
                     'to an application (%s) that differs from the application '
                     'already connected to (%s).' % (app_id, current_app_id))
  full_app_id.put(app_id)

  id_resolver = datastore_pbs.IdResolver((app_id,) + tuple(external_app_ids))
  project_id = id_resolver.resolve_project_id(app_id)
  endpoint = googledatastore.helper.get_project_endpoint_from_env(project_id)
  datastore = googledatastore.Datastore(
      project_endpoint=endpoint,
      credentials=googledatastore.helper.get_credentials_from_env())
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src/google/appengine/ext/ndb/tasklets.py [1231:1251]:
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  if not datastore_pbs._CLOUD_DATASTORE_ENABLED:
    raise datastore_errors.BadArgumentError(
        datastore_pbs.MISSING_CLOUD_DATASTORE_MESSAGE)
  import googledatastore
  from google.appengine.datastore import cloud_datastore_v1_remote_stub

  current_app_id = full_app_id.get()
  if current_app_id and current_app_id != app_id:


    raise ValueError('Cannot create a Cloud Datastore context that connects '
                     'to an application (%s) that differs from the application '
                     'already connected to (%s).' % (app_id, current_app_id))
  full_app_id.put(app_id)

  id_resolver = datastore_pbs.IdResolver((app_id,) + tuple(external_app_ids))
  project_id = id_resolver.resolve_project_id(app_id)
  endpoint = googledatastore.helper.get_project_endpoint_from_env(project_id)
  datastore = googledatastore.Datastore(
      project_endpoint=endpoint,
      credentials=googledatastore.helper.get_credentials_from_env())
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