Synnefo » snf-ganeti

def EncodeException(err):

  """Encodes an exception into a format that L{MaybeRaise} will recognise.

  The passed L{err} argument will be formatted as a tuple (exception

  name, arguments) that the MaybeRaise function will recognise.

  @type err: GenericError child

  @param err: usually a child of GenericError (but any exception

      will be accepted)

  @rtype: tuple

  @return: tuple of (exception name, exception arguments)

  """

  return (err.__class__.__name__, err.args)

def MaybeRaise(result):

  """Is this looks like an encoded Ganeti exception, raise it.

  This function tries to parse the passed argument and if it looks

  like an encoding done by EncodeException, it will re-raise it.

  """

  tlt = (tuple, list)

  if (isinstance(result, tlt) and len(result) == 2 and

      isinstance(result[1], tlt)):

    # custom ganeti errors

    err_class = GetErrorClass(result[0])

    if err_class is not None:

      raise err_class, tuple(result[1])