Get input data for the datastream
        :param datastream: string
        :param options: dict

def get_datastream_data(self, datastream, options):
        """
        Get input data for the datastream
        :param datastream: string
        :param options: dict
        """

        response_format=None
        if options and 'format' in options and options['format'] is not None:
            response_format = options['format']
            options['format'] = None

        url = '/datastream/' + str(datastream) + '/data'
        response = self.http.downstream(url, response_format)
        return response