servers.py 文件源码

def _handle_create_exception(*exc_info):
        """The `CREATE_EXCEPTIONS` dict containing the relationships between
        the nova exceptions and the webob exception classes to be raised is
        defined at the top of this file.
        """
        error = exc_info[1]
        err_cls = error.__class__
        cls_to_raise = CREATE_EXCEPTIONS.get(err_cls)
        if cls_to_raise is None:
            # The error is a subclass of one of the dict keys
            to_raise = [val for key, val in CREATE_EXCEPTIONS.items()
                        if isinstance(error, key)]
            if len(to_raise) > 1:
                cls_to_raise = Controller._resolve_exception(to_raise)
            elif not to_raise:
                # Not any of the expected exceptions, so re-raise
                six.reraise(*exc_info)
            else:
                cls_to_raise = to_raise[0]

        for key, val in CREATE_EXCEPTIONS_MSGS.items():
            if isinstance(error, key):
                raise cls_to_raise(explanation=CREATE_EXCEPTIONS_MSGS[key])
        raise cls_to_raise(explanation=error.format_message())