How to use the baseplate.lib.config function in baseplate

def test_fallback_option_works(self):
        parser = config.Fallback(config.Percent, config.Float)
        self.assertAlmostEqual(parser(".44"), 0.44)

# quiet kazoo's verbose logs a bit
    logging.getLogger("kazoo").setLevel(logging.WARNING)

    parser = configparser.RawConfigParser()
    parser.read_file(args.config_file)
    watcher_config = dict(parser.items("live-data"))

    cfg = config.parse_config(
        watcher_config,
        {
            "nodes": config.DictOf(
                {
                    "source": config.String,
                    "dest": config.String,
                    "owner": config.Optional(config.UnixUser),
                    "group": config.Optional(config.UnixGroup),
                    "mode": config.Optional(config.Integer(base=8), default=0o400),  # type: ignore
                }
            )
        },
    )
    # pylint: disable=maybe-no-member
    nodes = cfg.nodes.values()

    secrets = secrets_store_from_config(watcher_config, timeout=30)
    zookeeper = zookeeper_client_from_config(secrets, watcher_config, read_only=True)
    zookeeper.start()
    try:
        watch_zookeeper_nodes(zookeeper, nodes)
    finally:
        zookeeper.stop()

"socket_timeout": config.Optional(config.Timespan, default=None),
        }
    )
    options = parser.parse(prefix[:-1], app_config)

    if options.max_connections is not None:
        kwargs.setdefault("max_connections", options.max_connections)
    if options.socket_connect_timeout is not None:
        kwargs.setdefault("socket_connect_timeout", options.socket_connect_timeout.total_seconds())
    if options.socket_timeout is not None:
        kwargs.setdefault("socket_timeout", options.socket_timeout.total_seconds())

    return redis.BlockingConnectionPool.from_url(options.url, **kwargs)


class RedisClient(config.Parser):
    """Configure a Redis client.

    This is meant to be used with
    :py:meth:`baseplate.Baseplate.configure_context`.

    See :py:func:`pool_from_config` for available configuration settings.

    """

    def __init__(self, **kwargs: Any):
        self.kwargs = kwargs

    def parse(self, key_path: str, raw_config: config.RawConfig) -> "RedisContextFactory":
        connection_pool = pool_from_config(raw_config, f"{key_path}.", **self.kwargs)
        return RedisContextFactory(connection_pool)

error_reporter_from_config(app_config, __name__)

    :param raw_config: The application configuration which should have
        settings for the error reporter.
    :param module_name: ``__name__`` of the root module of the application.

    """
    cfg = config.parse_config(
        raw_config,
        {
            "sentry": {
                "dsn": config.Optional(config.String, default=None),
                "site": config.Optional(config.String, default=None),
                "environment": config.Optional(config.String, default=None),
                "include_paths": config.Optional(config.String, default=None),
                "exclude_paths": config.Optional(config.String, default=None),
                "ignore_exceptions": config.Optional(config.TupleOf(config.String), default=[]),
                "sample_rate": config.Optional(config.Percent, default=1),
                "processors": config.Optional(
                    config.TupleOf(config.String),
                    default=["raven.processors.SanitizePasswordsProcessor"],
                ),
            }
        },
    )

    application_module = sys.modules[module_name]
    module_path = os.path.abspath(application_module.__file__)
    directory = os.path.dirname(module_path)
    release = None
    while directory != "/":