ConfigHandler.hpp

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#pragma once
 
#include <filesystem>
#include <glaze/core/opts.hpp>
#include <glaze/core/reflect.hpp>
#include <glaze/glaze.hpp>
#include <glaze/json/read.hpp>
#include <glaze/json/write.hpp>
#include <spdlog/spdlog.h>
#include <srs/devices/Configuration.hpp>
#include <string>
#include <string_view>
 
namespace srs::config
{
    inline void output_config_to_json(const Config& app_config, std::string_view json_filename)
    {
        if (std::filesystem::exists(json_filename))
        {
            spdlog::critical("Cannot dump the default value to the configuration file {:?} as it's already existed!",
                             json_filename);
            return;
        }
        const auto parent_dir = std::filesystem::absolute(std::filesystem::path{ json_filename }).parent_path();
        std::filesystem::create_directories(parent_dir);
        auto buffer = std::string{};
        auto error_code = glz::write_file_json<glz::opts{ .prettify = true, .new_lines_in_arrays = false }>(
            app_config, json_filename, buffer);
        if (error_code)
        {
            spdlog::warn("Error occurred during writing the json file {}: {}",
                         json_filename,
                         glz::format_error(error_code, buffer));
        }
    }
 
    inline void set_config_from_json(Config& app_config, std::string_view json_filename)
    {
        if (json_filename.empty())
        {
            return;
        }
        if (not std::filesystem::exists(json_filename))
        {
            spdlog::warn("configuration file {:?} doesn't exist. Creating a new file with default values",
                         json_filename);
            output_config_to_json(app_config, json_filename);
        }
        else
        {
            auto buffer = std::string{};
            auto error_code = glz::read_file_json(app_config, json_filename, buffer);
            if (error_code)
            {
                spdlog::warn("Error occurred during reading the json file {}: {}",
                             json_filename,
                             glz::format_error(error_code, buffer));
            }
        }
    }
 
} // namespace srs::config