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#include "storage.hpp"
#include <filesystem>
#include <fstream>
#include <components/debug/debuglog.hpp>
namespace sol
{
template <>
struct is_automagical<LuaUtil::LuaStorage::SectionMutableView> : std::false_type {};
template <>
struct is_automagical<LuaUtil::LuaStorage::SectionReadOnlyView> : std::false_type {};
}
namespace LuaUtil
{
LuaStorage::Value LuaStorage::Section::sEmpty;
sol::object LuaStorage::Value::getCopy(lua_State* L) const
{
return deserialize(L, mSerializedValue);
}
sol::object LuaStorage::Value::getReadOnly(lua_State* L) const
{
if (mReadOnlyValue == sol::nil && !mSerializedValue.empty())
mReadOnlyValue = deserialize(L, mSerializedValue, nullptr, true);
return mReadOnlyValue;
}
const LuaStorage::Value& LuaStorage::Section::get(std::string_view key) const
{
auto it = mValues.find(key);
if (it != mValues.end())
return it->second;
else
return sEmpty;
}
void LuaStorage::Section::set(std::string_view key, const sol::object& value)
{
mValues[std::string(key)] = Value(value);
mChangeCounter++;
if (mStorage->mListener)
(*mStorage->mListener)(mSectionName, key, value);
}
bool LuaStorage::Section::wasChanged(int64_t& lastCheck)
{
bool res = lastCheck < mChangeCounter;
lastCheck = mChangeCounter;
return res;
}
sol::table LuaStorage::Section::asTable()
{
sol::table res(mStorage->mLua, sol::create);
for (const auto& [k, v] : mValues)
res[k] = v.getCopy(mStorage->mLua);
return res;
}
void LuaStorage::initLuaBindings(lua_State* L)
{
sol::state_view lua(L);
sol::usertype<SectionReadOnlyView> roView = lua.new_usertype<SectionReadOnlyView>("ReadOnlySection");
sol::usertype<SectionMutableView> mutableView = lua.new_usertype<SectionMutableView>("MutableSection");
roView["get"] = [](sol::this_state s, SectionReadOnlyView& section, std::string_view key)
{
return section.mSection->get(key).getReadOnly(s);
};
roView["getCopy"] = [](sol::this_state s, SectionReadOnlyView& section, std::string_view key)
{
return section.mSection->get(key).getCopy(s);
};
roView["wasChanged"] = [](SectionReadOnlyView& section) { return section.mSection->wasChanged(section.mLastCheck); };
roView["asTable"] = [](SectionReadOnlyView& section) { return section.mSection->asTable(); };
mutableView["get"] = [](sol::this_state s, SectionMutableView& section, std::string_view key)
{
return section.mSection->get(key).getReadOnly(s);
};
mutableView["getCopy"] = [](sol::this_state s, SectionMutableView& section, std::string_view key)
{
return section.mSection->get(key).getCopy(s);
};
mutableView["wasChanged"] = [](SectionMutableView& section) { return section.mSection->wasChanged(section.mLastCheck); };
mutableView["asTable"] = [](SectionMutableView& section) { return section.mSection->asTable(); };
mutableView["reset"] = [](SectionMutableView& section, sol::optional<sol::table> newValues)
{
section.mSection->mValues.clear();
if (newValues)
{
for (const auto& [k, v] : *newValues)
{
try
{
section.mSection->set(k.as<std::string_view>(), v);
}
catch (std::exception& e)
{
Log(Debug::Error) << "LuaUtil::LuaStorage::Section::reset(table): " << e.what();
}
}
}
section.mSection->mChangeCounter++;
section.mLastCheck = section.mSection->mChangeCounter;
};
mutableView["removeOnExit"] = [](SectionMutableView& section) { section.mSection->mPermanent = false; };
mutableView["set"] = [](SectionMutableView& section, std::string_view key, const sol::object& value)
{
if (section.mLastCheck == section.mSection->mChangeCounter)
section.mLastCheck++;
section.mSection->set(key, value);
};
}
void LuaStorage::clearTemporary()
{
auto it = mData.begin();
while (it != mData.end())
{
if (!it->second->mPermanent)
{
it->second->mValues.clear();
it = mData.erase(it);
}
else
++it;
}
}
void LuaStorage::load(const std::string& path)
{
assert(mData.empty()); // Shouldn't be used before loading
try
{
Log(Debug::Info) << "Loading Lua storage \"" << path << "\" (" << std::filesystem::file_size(path) << " bytes)";
std::ifstream fin(path, std::fstream::binary);
std::string serializedData((std::istreambuf_iterator<char>(fin)), std::istreambuf_iterator<char>());
sol::table data = deserialize(mLua, serializedData);
for (const auto& [sectionName, sectionTable] : data)
{
const std::shared_ptr<Section>& section = getSection(sectionName.as<std::string_view>());
for (const auto& [key, value] : sol::table(sectionTable))
section->set(key.as<std::string_view>(), value);
}
}
catch (std::exception& e)
{
Log(Debug::Error) << "Can not read \"" << path << "\": " << e.what();
}
}
void LuaStorage::save(const std::string& path) const
{
sol::table data(mLua, sol::create);
for (const auto& [sectionName, section] : mData)
{
if (section->mPermanent)
data[sectionName] = section->asTable();
}
std::string serializedData = serialize(data);
Log(Debug::Info) << "Saving Lua storage \"" << path << "\" (" << serializedData.size() << " bytes)";
std::ofstream fout(path, std::fstream::binary);
fout.write(serializedData.data(), serializedData.size());
fout.close();
}
const std::shared_ptr<LuaStorage::Section>& LuaStorage::getSection(std::string_view sectionName)
{
auto it = mData.find(sectionName);
if (it != mData.end())
return it->second;
auto section = std::make_shared<Section>(this, std::string(sectionName));
sectionName = section->mSectionName;
auto [newIt, _] = mData.emplace(sectionName, std::move(section));
return newIt->second;
}
sol::object LuaStorage::getReadOnlySection(std::string_view sectionName)
{
const std::shared_ptr<Section>& section = getSection(sectionName);
return sol::make_object<SectionReadOnlyView>(mLua, SectionReadOnlyView{section, section->mChangeCounter});
}
sol::object LuaStorage::getMutableSection(std::string_view sectionName)
{
const std::shared_ptr<Section>& section = getSection(sectionName);
return sol::make_object<SectionMutableView>(mLua, SectionMutableView{section, section->mChangeCounter});
}
sol::table LuaStorage::getAllSections()
{
sol::table res(mLua, sol::create);
for (const auto& [sectionName, _] : mData)
res[sectionName] = getMutableSection(sectionName);
return res;
}
}
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