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// Copyright Epic Games, Inc. All Rights Reserved.
#include "dlltransport.h"
#include <zencore/except.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
#include <zencore/scopeguard.h>
#include <exception>
#include <thread>
#include <vector>
ZEN_THIRD_PARTY_INCLUDES_START
#include <fmt/format.h>
ZEN_THIRD_PARTY_INCLUDES_END
#if ZEN_WITH_PLUGINS
namespace zen {
//////////////////////////////////////////////////////////////////////////
struct LoadedDll
{
std::string Name;
std::filesystem::path LoadedFromPath;
Ref<TransportPlugin> Plugin;
};
class DllTransportPluginImpl : public DllTransportPlugin, RefCounted
{
public:
DllTransportPluginImpl();
~DllTransportPluginImpl();
virtual uint32_t AddRef() const override;
virtual uint32_t Release() const override;
virtual void Configure(const char* OptionTag, const char* OptionValue) override;
virtual void Initialize(TransportServer* ServerInterface) override;
virtual void Shutdown() override;
virtual const char* GetDebugName() override;
virtual bool IsAvailable() override;
virtual void LoadDll(std::string_view Name) override;
virtual void ConfigureDll(std::string_view Name, const char* OptionTag, const char* OptionValue) override;
private:
TransportServer* m_ServerInterface = nullptr;
RwLock m_Lock;
std::vector<LoadedDll> m_Transports;
};
DllTransportPluginImpl::DllTransportPluginImpl()
{
}
DllTransportPluginImpl::~DllTransportPluginImpl()
{
}
uint32_t
DllTransportPluginImpl::AddRef() const
{
return RefCounted::AddRef();
}
uint32_t
DllTransportPluginImpl::Release() const
{
return RefCounted::Release();
}
void
DllTransportPluginImpl::Configure(const char* OptionTag, const char* OptionValue)
{
// No configuration options
ZEN_UNUSED(OptionTag, OptionValue);
}
void
DllTransportPluginImpl::Initialize(TransportServer* ServerIface)
{
m_ServerInterface = ServerIface;
RwLock::ExclusiveLockScope _(m_Lock);
for (LoadedDll& Transport : m_Transports)
{
try
{
Transport.Plugin->Initialize(ServerIface);
}
catch (const std::exception&)
{
// TODO: report
}
}
}
void
DllTransportPluginImpl::Shutdown()
{
RwLock::ExclusiveLockScope _(m_Lock);
for (LoadedDll& Transport : m_Transports)
{
try
{
Transport.Plugin->Shutdown();
}
catch (const std::exception&)
{
// TODO: report
}
}
}
const char*
DllTransportPluginImpl::GetDebugName()
{
return nullptr;
}
bool
DllTransportPluginImpl::IsAvailable()
{
return true;
}
void
DllTransportPluginImpl::ConfigureDll(std::string_view Name, const char* OptionTag, const char* OptionValue)
{
RwLock::ExclusiveLockScope _(m_Lock);
for (auto& Transport : m_Transports)
{
if (Transport.Name == Name)
{
Transport.Plugin->Configure(OptionTag, OptionValue);
}
}
}
void
DllTransportPluginImpl::LoadDll(std::string_view Name)
{
RwLock::ExclusiveLockScope _(m_Lock);
ExtendableStringBuilder<128> DllPath;
DllPath << Name << ".dll";
HMODULE DllHandle = LoadLibraryA(DllPath.c_str());
if (!DllHandle)
{
std::error_code Ec = MakeErrorCodeFromLastError();
throw std::system_error(Ec, fmt::format("failed to load transport DLL from '{}'", DllPath));
}
TransportPlugin* CreateTransportPlugin();
PfnCreateTransportPlugin CreatePlugin = (PfnCreateTransportPlugin)GetProcAddress(DllHandle, "CreateTransportPlugin");
if (!CreatePlugin)
{
std::error_code Ec = MakeErrorCodeFromLastError();
FreeLibrary(DllHandle);
throw std::system_error(Ec, fmt::format("API mismatch detected in transport DLL loaded from '{}'", DllPath));
}
LoadedDll NewDll;
NewDll.Name = Name;
NewDll.LoadedFromPath = DllPath.c_str();
NewDll.Plugin = CreatePlugin();
m_Transports.emplace_back(std::move(NewDll));
}
DllTransportPlugin*
CreateDllTransportPlugin()
{
return new DllTransportPluginImpl;
}
} // namespace zen
#endif
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