appengine.py 文件源码

def locked_get(self):
    """Retrieve Credential from datastore.

    Returns:
      oauth2client.Credentials
    """
    credentials = None
    if self._cache:
      json = self._cache.get(self._key_name)
      if json:
        credentials = Credentials.new_from_json(json)
    if credentials is None:
      entity = self._get_entity()
      if entity is not None:
        credentials = getattr(entity, self._property_name)
        if self._cache:
          self._cache.set(self._key_name, credentials.to_json())

    if credentials and hasattr(credentials, 'set_store'):
      credentials.set_store(self)
    return credentials