message_dispatcher.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2025 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#ifndef ORES_COMMS_MESSAGING_MESSAGE_DISPATCHER_HPP
#define ORES_COMMS_MESSAGING_MESSAGE_DISPATCHER_HPP
 
#include <map>
#include <memory>
#include <expected>
#include <boost/asio/awaitable.hpp>
#include "ores.utility/log/make_logger.hpp"
#include "ores.comms/messaging/frame.hpp"
#include "ores.comms/messaging/message_handler.hpp"
#include "ores.comms/service/auth_session_service.hpp"
 
namespace ores::comms::messaging {
 
class message_dispatcher final {
private:
    inline static std::string_view logger_name =
        "ores.comms.messaging.message_dispatcher";
 
    static auto& lg() {
        using namespace ores::utility::log;
        static auto instance = make_logger(logger_name);
        return instance;
    }
 
public:
    explicit message_dispatcher(std::shared_ptr<service::auth_session_service> sessions);
 
    void register_handler(message_type_range range,
        std::shared_ptr<message_handler> handler);
 
    boost::asio::awaitable<std::expected<frame, error_code>>
    dispatch(const frame& request_frame, std::uint32_t sequence,
             const std::string& remote_address,
             compression_type response_compression = compression_type::none);
 
private:
    message_handler* find_handler(message_type type) const;
 
    message_type get_response_type(message_type request_type) const;
 
    std::shared_ptr<service::auth_session_service> sessions_;
    std::map<message_type_range, std::shared_ptr<message_handler>> handlers_;
};
 
}
 
#endif