def GetGoogleSqlOAuth2RefreshToken(oauth_file_path):
  if not os.path.exists(oauth_file_path):
    return None
  try:
    with open(oauth_file_path) as oauth_file:
      token = simplejson.load(oauth_file)
      return token['refresh_token']
  except (IOError, KeyError, simplejson.decoder.JSONDecodeError):
    logging.exception(
        'Could not read OAuth2.0 token from %s', oauth_file_path)
    return None
Reads the user's Google Cloud SQL OAuth2.0 token from disk.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/dev_appserver.py/GetGoogleSqlOAuth2RefreshToken