How to use the jsonrpcserver.methods.add function in jsonrpcserver

    @methods.add
    def server_exit(**params):
        engine = get_icon_service_engine()
        engine.close()
        shutdown()

    @methods.add
    def icx_getBalance(**params):
        engine = get_icon_service_engine()

        # params['address'] = Address.from_string(params['address'])
        params = _type_converter.convert(params, recursive=False)
        value = engine.query(method='icx_getBalance', params=params)

        return hex(value)

@methods.add
def ping():
    return 'pong'

@methods.add
def ping():
    return 'pong'

    @methods.add
    def icx_sendTransaction(**kwargs):
        """ icx_sendTransaction jsonrpc handler.
        We assume that only one tx in a block.

        :param kwargs: jsonrpc params field.
        """
        engine = get_icon_service_engine()

        params = _type_converter.convert(kwargs, recursive=False)

        tx = {
            'method': 'icx_sendTransaction',
            'params': params
        }

        block_height: int = get_block_height()

    @methods.add
    def icx_getTotalSupply(**params):
        engine = get_icon_service_engine()

        value: int = engine.query(method='icx_getTotalSupply', params=params)
        return hex(value)

    @methods.add
    def icx_call(**params):
        engine = get_icon_service_engine()
        params = _type_converter.convert(params, recursive=False)
        value = engine.query(method='icx_call', params=params)

        if isinstance(value, int):
            value = hex(value)

        return value

    @methods.add
    def icx_getBalance(**params):
        engine = get_icon_service_engine()

        # params['address'] = Address.from_string(params['address'])
        params = _type_converter.convert(params, recursive=False)
        value = engine.query(method='icx_getBalance', params=params)

        return hex(value)

    @methods.add
    def icx_sendTransaction(**kwargs):
        """ icx_sendTransaction jsonrpc handler.
        We assume that only one tx in a block.

        :param kwargs: jsonrpc params field.
        """
        engine = get_icon_service_engine()

        params = _type_converter.convert(kwargs, recursive=False)

        tx = {
            'method': 'icx_sendTransaction',
            'params': params
        }

        block_height: int = get_block_height()

    @methods.add
    def icx_call(**params):
        engine = get_icon_service_engine()
        params = _type_converter.convert(params, recursive=False)
        value = engine.query(method='icx_call', params=params)

        if isinstance(value, int):
            value = hex(value)

        return value