OpenRGB/SettingsManager.cpp

/*-----------------------------------------*\
|  SettingsManager.cpp                      |
|                                           |
|  OpenRGB Settings Manager maintains a list|
|  of application settings in JSON format.  |
|  Other components may register settings   |
|  with this class and store/load values.   |
|                                           |
|  Adam Honse (CalcProgrammer1) 11/4/2020   |
\*-----------------------------------------*/

#include "SettingsManager.h"
#include "LogManager.h"

#include <fstream>
#include <iostream>

SettingsManager::SettingsManager()
{
    config_found = false;
}

SettingsManager::~SettingsManager()
{

}

json SettingsManager::GetSettings(std::string settings_key)
{
    /*---------------------------------------------------------*\
    | Check to see if the key exists in the settings store and  |
    | return the settings associated with the key if it exists  |
    | We lock the mutex to protect the value from changing      |
    | while data is being read and copy before unlocking        |
    \*---------------------------------------------------------*/
    json result;

    mutex.lock();
    if(settings_data.contains(settings_key))
    {
        result = settings_data[settings_key];
    }

    mutex.unlock();

    return result;
}

void SettingsManager::SetSettings(std::string settings_key, json new_settings)
{
    mutex.lock();
    settings_data[settings_key] = new_settings;
    mutex.unlock();
}

void SettingsManager::LoadSettings(const filesystem::path& filename)
{
    /*---------------------------------------------------------*\
    | Clear any stored settings before loading                  |
    \*---------------------------------------------------------*/
    mutex.lock();

    settings_data.clear();

    /*---------------------------------------------------------*\
    | Store settings filename, so we can save to it later       |
    \*---------------------------------------------------------*/
    settings_filename = filename;

    /*---------------------------------------------------------*\
    | Open input file in binary mode                            |
    \*---------------------------------------------------------*/
    config_found = filesystem::exists(filename);
    if(config_found)
    {
        std::ifstream settings_file(settings_filename, std::ios::in | std::ios::binary);

        /*---------------------------------------------------------*\
        | Read settings into JSON store                             |
        \*---------------------------------------------------------*/
        if(settings_file)
        {
            try
            {
                settings_file >> settings_data;
            }
            catch(const std::exception& e)
            {
                /*-------------------------------------------------*\
                | If an exception was caught, that means the JSON   |
                | parsing failed.  Clear out any data in the store  |
                | as it is corrupt.                                 |
                | We could attempt a reload for backup location     |
                \*-------------------------------------------------*/
                LOG_ERROR("[SettingsManager] JSON parsing failed: %s", e.what());

                settings_data.clear();
            }
        }

        settings_file.close();
    }

    mutex.unlock();
}

void SettingsManager::SaveSettings()
{
    mutex.lock();
    std::ofstream settings_file(settings_filename, std::ios::out | std::ios::binary);

    if(settings_file)
    {
        try
        {
            settings_file << settings_data.dump(4);
        }
        catch(const std::exception& e)
        {
            LOG_ERROR("[SettingsManager] Cannot write to file: %s", e.what());
        }

        settings_file.close();
    }
    mutex.unlock();
}