<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def validate_request(self, data: Any, *additional: AnyMapping, merged_class: Type[dict] = dict) -> Any: r"""Validate request data against request schema from module. :param data: Request data. :param \*additional: Additional data dicts to be merged with base request data. :param merged_class: When additional data dicts supplied method by default will return merged **dict** with all data, but you can customize things to use read-only dict or any other additional class or callable. """

        request_schema = getattr(self.module, 'request', None)
        if request_schema is None:
            logger.error(
                'Request schema should be defined',
                extra={'schema_module': self.module,
                       'schema_module_attrs': dir(self.module)})
            raise self.make_error('Request schema should be defined')

        # Merge base and additional data dicts, but only if additional data
        # dicts have been supplied
        if isinstance(data, dict) and additional:
            data = merged_class(self._merge_data(data, *additional))

        try:
            self._validate(data, request_schema)
        finally:
            self._valid_request = False

        self._valid_request = True

        processor = getattr(self.module, 'request_processor', None)
        return processor(data) if processor else data