parsed_parameters.h

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/*
 * Copyright 2023 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <memory>
#include <tuple>
#include <utility>
 
#include <msgpack.hpp>
 
#include "msgpack_rpc/common/msgpack_rpc_exception.h"
#include "msgpack_rpc/common/status_code.h"
 
namespace msgpack_rpc::messages {

class ParsedParameters {
public:
    explicit ParsedParameters(
        msgpack::object object, std::shared_ptr<msgpack::zone> zone)
        : object_(object), zone_(std::move(zone)) {
        if (object.type != msgpack::type::ARRAY) {
            throw MsgpackRPCException(
                StatusCode::INVALID_MESSAGE, "Invalid type of parameters.");
        }
    }

    template <typename... Parameters>
    [[nodiscard]] std::tuple<Parameters...> as() const {
        try {
            // msgpack library doesn't check the number of elements in tuples.
            if (object_.via.array.size != sizeof...(Parameters)) {
                throw MsgpackRPCException(StatusCode::INVALID_MESSAGE,
                    "Invalid number of parameters.");
            }
            return object_.as<std::tuple<Parameters...>>();
        } catch (const msgpack::type_error&) {
            throw MsgpackRPCException(
                StatusCode::TYPE_ERROR, "Invalid types of parameters.");
        }
    }
 
private:
    msgpack::object object_;

    std::shared_ptr<msgpack::zone> zone_;
};
 
}  // namespace msgpack_rpc::messages