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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero 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 Affero General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CONFIGVALUECACHE_H
#define CONFIGVALUECACHE_H
#include "Common.h"
#include "Config.h"
#include "Errors.h"
#include "Log.h"
#include <variant>
template<typename ConfigEnum>
class ConfigValueCache
{
static_assert(std::is_enum_v<ConfigEnum>);
public:
enum class Reloadable : bool
{
No = false,
Yes = true
};
ConfigValueCache(ConfigEnum const configCount)
{
_configs.resize(static_cast<uint32>(configCount));
_reloading = false;
}
void Initialize(bool reload)
{
_reloading = reload;
BuildConfigCache();
_reloading = false;
VerifyAllConfigsLoaded();
}
template<class T>
void SetConfigValue(ConfigEnum const config, std::string const& configName, T const& defaultValue, Reloadable reloadable = Reloadable::Yes, std::function<bool(T const& value)>&& checker = {}, std::string const& validationErrorText = "")
{
uint32 const configIndex = static_cast<uint32>(config);
ASSERT(configIndex < _configs.size(), "Config index out of bounds");
T const& configValue = sConfigMgr->GetOption<T>(configName, defaultValue);
bool configValueChanged = false;
if (_reloading)
{
if (std::get<T>(_configs[configIndex]) != configValue)
configValueChanged = true;
if (reloadable == Reloadable::No)
{
if (configValueChanged)
LOG_ERROR("server.loading", "Server Config (Name: {}) cannot be changed by reload. A server restart is required to update this config value.", configName);
return;
}
}
else
ASSERT(_configs[configIndex].index() == 0, "Config overwriting an existing value");
if (checker && !checker(configValue))
{
LOG_ERROR("server.loading", "Server Config (Name: {}) failed validation check '{}'. Default value '{}' will be used instead.", configName, validationErrorText, defaultValue);
_configs[configIndex] = defaultValue;
}
else
_configs[configIndex] = configValue;
}
template<class T>
void OverwriteConfigValue(ConfigEnum const config, T const& value)
{
uint32 const configIndex = static_cast<uint32>(config);
ASSERT(configIndex < _configs.size(), "Config index out of bounds");
size_t const oldValueTypeIndex = _configs[configIndex].index();
ASSERT(oldValueTypeIndex != 0, "Config value must already be set");
_configs[configIndex] = value;
ASSERT(oldValueTypeIndex == _configs[configIndex].index(), "Config value type changed");
}
template<class T>
T GetConfigValue(ConfigEnum const config) const
{
uint32 const configIndex = static_cast<uint32>(config);
ASSERT(configIndex < _configs.size(), "Config index out of bounds");
ASSERT(_configs[configIndex].index() != 0, "Config value must already be set");
T const* value = std::get_if<T>(&_configs[configIndex]);
ASSERT(value, "Wrong config variant type");
return *value;
}
// Custom handling for string configs to convert from std::string to std::string_view
std::string_view GetConfigValue(ConfigEnum const config) const
{
uint32 const configIndex = static_cast<uint32>(config);
ASSERT(configIndex < _configs.size(), "Config index out of bounds");
ASSERT(_configs[configIndex].index() != 0, "Config value must already be set");
std::string const* stringValue = std::get_if<std::string>(&_configs[configIndex]);
ASSERT(stringValue, "Wrong config variant type");
return std::string_view(*stringValue);
}
protected:
virtual void BuildConfigCache() = 0;
private:
void VerifyAllConfigsLoaded()
{
uint32 configIndex = 0;
for (auto const& variant : _configs)
{
if (variant.index() == 0)
{
LOG_ERROR("server.loading", "Server Config (Index: {}) is defined but not loaded, unable to continue.", configIndex);
ASSERT(false);
}
++configIndex;
}
}
std::vector<std::variant<std::monostate, float, bool, uint32, std::string>> _configs;
bool _reloading;
};
#endif
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