def get_previous_dataset(self, dataset: xr.Dataset) -> xr.Dataset: """Utility method to retrieve the previous set of data for hte same datastream as the provided dataset from the DatastreamStorage. :param dataset: The reference dataset that will be used to search the DatastreamStore for prior data. :type dataset: xr.Dataset :return: The previous dataset from the DatastreamStorage if it exists, otherwise None. :rtype: xr.Dataset """ prev_dataset = None start_date, start_time = DSUtil.get_start_time(dataset) datastream_name = DSUtil.get_datastream_name(dataset, self.config) with self.storage.fetch_previous_file( datastream_name, f"{start_date}.{start_time}" ) as netcdf_file: if netcdf_file: prev_dataset = self.storage.handlers.read( file=netcdf_file, name=netcdf_file ) return prev_dataset
def test_start_time_is_correct(raw_dataset, dataset, config): expected = ("20211001", "000000") time_definition = config.dataset_definition.get_variable("time") assert DSUtil.get_raw_start_time(raw_dataset, time_definition) == expected assert DSUtil.get_start_time(dataset) == expected