message_parser.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 <cstddef>
#include <optional>
 
#include <msgpack.hpp>
 
#include "msgpack_rpc/config/message_parser_config.h"
#include "msgpack_rpc/impl/msgpack_rpc_export.h"
#include "msgpack_rpc/messages/buffer_view.h"
#include "msgpack_rpc/messages/parsed_message.h"
 
namespace msgpack_rpc::messages {

class MSGPACK_RPC_EXPORT MessageParser {
public:
    explicit MessageParser(const config::MessageParserConfig& config);
 
    MessageParser(const MessageParser&) = delete;
    MessageParser(MessageParser&&) = delete;
    MessageParser& operator=(const MessageParser&) = delete;
    MessageParser& operator=(MessageParser&&) = delete;

    ~MessageParser();

    BufferView prepare_buffer();

    void consumed(std::size_t num_bytes);

    [[nodiscard]] std::optional<ParsedMessage> try_parse();
 
private:
    msgpack::unpacker parser_;

    std::size_t read_buffer_size_;
};
 
}  // namespace msgpack_rpc::messages