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// Copyright Epic Games, Inc. All Rights Reserved.
#include "dlltransport.h"
#include <zencore/except.h>
#include <zencore/logging.h>
#include <zencore/scopeguard.h>
#include <exception>
#include <thread>
#include <vector>
#if ZEN_WITH_PLUGINS
namespace zen {
struct DllTransportConnection : public TransportConnection
{
public:
DllTransportConnection();
~DllTransportConnection();
void Initialize(TransportServerConnection& ServerConnection);
void HandleConnection();
// TransportConnection
virtual int64_t WriteBytes(const void* Buffer, size_t DataSize) override;
virtual void Shutdown(bool Receive, bool Transmit) override;
virtual void CloseConnection() override;
private:
Ref<TransportServerConnection> m_ConnectionHandler;
bool m_IsTerminated = false;
};
DllTransportConnection::DllTransportConnection()
{
}
DllTransportConnection::~DllTransportConnection()
{
}
void
DllTransportConnection::Initialize(TransportServerConnection& ServerConnection)
{
m_ConnectionHandler = &ServerConnection; // TODO: this is awkward
}
void
DllTransportConnection::HandleConnection()
{
}
void
DllTransportConnection::CloseConnection()
{
if (m_IsTerminated)
{
return;
}
m_IsTerminated = true;
}
int64_t
DllTransportConnection::WriteBytes(const void* Buffer, size_t DataSize)
{
ZEN_UNUSED(Buffer, DataSize);
return DataSize;
}
void
DllTransportConnection::Shutdown(bool Receive, bool Transmit)
{
ZEN_UNUSED(Receive, Transmit);
}
//////////////////////////////////////////////////////////////////////////
struct LoadedDll
{
std::string Name;
std::filesystem::path LoadedFromPath;
Ref<TransportPlugin> Plugin;
};
class DllTransportPluginImpl
{
public:
DllTransportPluginImpl(uint16_t BasePort, unsigned int ThreadCount);
~DllTransportPluginImpl();
uint16_t Start(TransportServer* ServerInterface);
void Stop();
bool IsAvailable();
void LoadDll(std::string_view Name);
private:
TransportServer* m_ServerInterface = nullptr;
RwLock m_Lock;
std::vector<LoadedDll> m_Transports;
uint16_t m_BasePort = 0;
int m_ThreadCount = 0;
};
DllTransportPluginImpl::DllTransportPluginImpl(uint16_t BasePort, unsigned int ThreadCount)
: m_BasePort(BasePort)
, m_ThreadCount(ThreadCount != 0 ? ThreadCount : Max(std::thread::hardware_concurrency(), 8u))
{
}
DllTransportPluginImpl::~DllTransportPluginImpl()
{
}
uint16_t
DllTransportPluginImpl::Start(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
}
}
return m_BasePort;
}
void
DllTransportPluginImpl::Stop()
{
RwLock::ExclusiveLockScope _(m_Lock);
for (LoadedDll& Transport : m_Transports)
{
try
{
Transport.Plugin->Shutdown();
}
catch (const std::exception&)
{
// TODO: report
}
}
}
bool
DllTransportPluginImpl::IsAvailable()
{
return true;
}
void
DllTransportPluginImpl::LoadDll(std::string_view Name)
{
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::DllTransportPlugin(uint16_t BasePort, unsigned int ThreadCount)
: m_Impl(std::make_unique<DllTransportPluginImpl>(BasePort, ThreadCount))
{
}
DllTransportPlugin::~DllTransportPlugin()
{
m_Impl->Stop();
}
uint32_t
DllTransportPlugin::AddRef() const
{
return RefCounted::AddRef();
}
uint32_t
DllTransportPlugin::Release() const
{
return RefCounted::Release();
}
void
DllTransportPlugin::Initialize(TransportServer* ServerInterface)
{
m_Impl->Start(ServerInterface);
}
void
DllTransportPlugin::Shutdown()
{
m_Impl->Stop();
}
bool
DllTransportPlugin::IsAvailable()
{
return m_Impl->IsAvailable();
}
void
DllTransportPlugin::LoadDll(std::string_view Name)
{
return m_Impl->LoadDll(Name);
}
} // namespace zen
#endif
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