def get_current_calibration(self) -> calibration.Calibration | None:
        """Returns metadata about the current calibration for a processor.

        Returns:
            The calibration data or None if there is no current calibration.
        """
        response = self.context.client.get_current_calibration(self.project_id, self.processor_id)
        if response is not None:
            return _to_calibration(response.data)
        else:
            return None
Returns metadata about the current calibration for a processor.

        Returns:
            The calibration data or None if there is no current calibration.
        
cirq-google/cirq_google/engine/engine_processor.py