def parse_args()

in python/dataproc_templates/cassandra/cassandra_to_bigquery.py [0:0]
75 lines of code
7 McCabe index (conditional complexity)

    def parse_args(args: Optional[Sequence[str]] = None) -> Dict[str, Any]:
        parser: argparse.ArgumentParser = argparse.ArgumentParser()

        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_INPUT_TABLE}',
            dest=constants.CASSANDRA_TO_BQ_INPUT_TABLE,
            required=False,
            help='Cassandra to BQ Input table name'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_INPUT_HOST}',
            dest=constants.CASSANDRA_TO_BQ_INPUT_HOST,
            required=True,
            help='Input hostname for Cassandra cluster'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_BIGQUERY_LOCATION}',
            dest=constants.CASSANDRA_TO_BQ_BIGQUERY_LOCATION,
            required=True,
            help='Target table in BQ Format: <dataset>.<table-name>'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_WRITE_MODE}',
            dest=constants.CASSANDRA_TO_BQ_WRITE_MODE,
            required=False,
            default=constants.OUTPUT_MODE_APPEND,
            help=(
                'Output write mode '
                '(one of: append,overwrite,ignore,errorifexists) '
                '(Defaults to append)'
            ),
            choices=[
                constants.OUTPUT_MODE_OVERWRITE,
                constants.OUTPUT_MODE_APPEND,
                constants.OUTPUT_MODE_IGNORE,
                constants.OUTPUT_MODE_ERRORIFEXISTS
            ]
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_TEMP_LOCATION}',
            dest=constants.CASSANDRA_TO_BQ_TEMP_LOCATION,
            required=True,
            help='Cloud Storage location for staging, Format: <bucket-name>'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_QUERY}',
            dest=constants.CASSANDRA_TO_BQ_QUERY,
            required=False,
            help='Optional query for selective exports'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_CATALOG}',
            dest=constants.CASSANDRA_TO_BQ_CATALOG,
            required=False,
            default="casscon",
            help='To provide a name for connection between Cassandra and BQ'
        )
        parser.add_argument(
            f'--{constants.CASSANDRA_TO_BQ_INPUT_KEYSPACE}',
            dest=constants.CASSANDRA_TO_BQ_INPUT_KEYSPACE,
            required=False,
            help='Keyspace Name of Cassandra Table'
        )

        known_args: argparse.Namespace
        known_args, _ = parser.parse_known_args(args)

        if (not getattr(known_args, constants.CASSANDRA_TO_BQ_QUERY)
            and (not getattr(known_args, constants.CASSANDRA_TO_BQ_INPUT_KEYSPACE)
            or not getattr(known_args, constants.CASSANDRA_TO_BQ_INPUT_TABLE))):

            sys.exit("ArgumentParser Error: Either of cassandratobq.input.keyspace and cassandratobq.input.table "
                        + "OR cassandratobq.input.query needs to be provided as argument to read data from Cassandra")

        elif (getattr(known_args, constants.CASSANDRA_TO_BQ_QUERY)
            and (getattr(known_args, constants.CASSANDRA_TO_BQ_INPUT_KEYSPACE)
            or getattr(known_args, constants.CASSANDRA_TO_BQ_INPUT_TABLE))):

            sys.exit("ArgumentParser Error: Both cassandratobq.input.keyspace and cassandratobq.input.table "
                        + "AND cassandratobq.input.query cannot be provided as arguments at the same time.")

        return vars(known_args)