session_reader.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_ANALYSER_DOMAIN_SESSION_READER_HPP
#define ORES_COMMS_ANALYSER_DOMAIN_SESSION_READER_HPP
 
#include <vector>
#include <string>
#include <chrono>
#include <fstream>
#include <cstdint>
#include <expected>
#include <filesystem>
#include <boost/uuid/uuid.hpp>
#include "ores.logging/make_logger.hpp"
#include "ores.comms/messaging/frame.hpp"
#include "ores.comms/recording/session_file.hpp"
 
namespace ores::comms::analyser::domain {
 
struct session_metadata {
    boost::uuids::uuid session_id;
    std::chrono::system_clock::time_point start_time;
    std::string server_address;
    std::uint16_t protocol_version_major;
    std::uint16_t protocol_version_minor;
    comms::messaging::compression_type compression;
};
 
struct recorded_frame {
    std::int64_t timestamp_offset_us;
    comms::recording::frame_direction direction;
    comms::messaging::frame frame;
};
 
struct session_data {
    session_metadata metadata;
    std::vector<recorded_frame> frames;
};
 
class session_reader final {
private:
    inline static std::string_view logger_name = "ores.comms.analyser.domain.session_reader";
 
    static auto& lg() {
        using namespace ores::logging;
        static auto instance = make_logger(logger_name);
        return instance;
    }
 
public:
    static std::expected<session_data, comms::recording::session_file_error>
    read(const std::filesystem::path& file_path);
 
    static std::expected<session_metadata, comms::recording::session_file_error>
    read_metadata(const std::filesystem::path& file_path);
 
private:
    static std::expected<std::pair<session_metadata, std::uint16_t>, comms::recording::session_file_error>
    read_header(std::ifstream& file);
 
    static std::expected<recorded_frame, comms::recording::session_file_error>
    read_frame_record(std::ifstream& file);
};
 
}
 
#endif