def parse_args()

in python/dataproc_templates/cassandra/cassandra_to_gcs.py [0:0]
82 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_GCS_INPUT_HOST}',
           dest=constants.CASSANDRA_TO_GCS_INPUT_HOST,
           required=True,
           help='CASSANDRA Cloud Storage Input Host IP'
       )
       parser.add_argument(
           f'--{constants.CASSANDRA_TO_GCS_OUTPUT_FORMAT}',
           dest=constants.CASSANDRA_TO_GCS_OUTPUT_FORMAT,
           required=True,
           help='Output file format (one of: avro,parquet,csv,json)',
           choices=[
               constants.FORMAT_AVRO,
               constants.FORMAT_PRQT,
               constants.FORMAT_CSV,
               constants.FORMAT_JSON
           ]
       )
       parser.add_argument(
           f'--{constants.CASSANDRA_TO_GCS_OUTPUT_PATH}',
           dest=constants.CASSANDRA_TO_GCS_OUTPUT_PATH,
           required=True,
           help='Cloud Storage location for output files'
       )
       parser.add_argument(
           f'--{constants.CASSANDRA_TO_GCS_OUTPUT_SAVEMODE}',
           dest=constants.CASSANDRA_TO_GCS_OUTPUT_SAVEMODE,
           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_GCS_CATALOG}',
            dest=constants.CASSANDRA_TO_GCS_CATALOG,
            required=False,
            default="casscon",
            help='To provide a name for connection between Cassandra and GCS'
       )
       parser.add_argument(
            f'--{constants.CASSANDRA_TO_GCS_QUERY}',
            dest=constants.CASSANDRA_TO_GCS_QUERY,
            required=False,
            help='Optional query for selective exports'
       )

       parser.add_argument(
            f'--{constants.CASSANDRA_TO_GCS_INPUT_KEYSPACE}',
            dest=constants.CASSANDRA_TO_GCS_INPUT_KEYSPACE,
            required=(constants.CASSANDRA_TO_GCS_QUERY is None),
            help='CASSANDRA Cloud Storage Input Keyspace'
       )
       parser.add_argument(
           f'--{constants.CASSANDRA_TO_GCS_INPUT_TABLE}',
           dest=constants.CASSANDRA_TO_GCS_INPUT_TABLE,
           required=(constants.CASSANDRA_TO_GCS_QUERY is None),
           help='CASSANDRA Cloud Storage Input Table'
       )
       add_spark_options(parser, constants.get_csv_output_spark_options("cassandra.gcs.output."))

       known_args: argparse.Namespace
       known_args, _ = parser.parse_known_args(args)
       if (not getattr(known_args, constants.CASSANDRA_TO_GCS_QUERY)
            and (not getattr(known_args, constants.CASSANDRA_TO_GCS_INPUT_KEYSPACE)
            or not getattr(known_args, constants.CASSANDRA_TO_GCS_INPUT_TABLE))):

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

       elif (getattr(known_args, constants.CASSANDRA_TO_GCS_QUERY)
            and (getattr(known_args, constants.CASSANDRA_TO_GCS_INPUT_KEYSPACE)
            or getattr(known_args, constants.CASSANDRA_TO_GCS_INPUT_TABLE))):

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


       return vars(known_args)