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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/enumflags.h>
#include <zencore/thread.h>
#include <spdlog/spdlog.h>
#include <gsl/gsl-lite.hpp>
#include <atomic>
#include <filesystem>
class ZenServerEnvironment
{
public:
ZenServerEnvironment();
~ZenServerEnvironment();
void Initialize(std::filesystem::path ProgramBaseDir);
void InitializeForTest(std::filesystem::path ProgramBaseDir, std::filesystem::path TestBaseDir);
std::filesystem::path CreateNewTestDir();
std::filesystem::path ProgramBaseDir() const { return m_ProgramBaseDir; }
std::filesystem::path GetTestRootDir(std::string_view Path);
inline bool IsInitialized() const { return m_IsInitialized; }
inline bool IsTestEnvironment() const { return m_IsTestInstance; }
private:
std::filesystem::path m_ProgramBaseDir;
std::filesystem::path m_TestBaseDir;
bool m_IsInitialized = false;
bool m_IsTestInstance = false;
};
struct ZenServerInstance
{
ZenServerInstance(ZenServerEnvironment& TestEnvironment);
~ZenServerInstance();
void Shutdown();
void SignalShutdown();
void WaitUntilReady();
[[nodiscard]] bool WaitUntilReady(int Timeout);
void EnableTermination() { m_Terminate = true; }
void EnableMesh() { m_MeshEnabled = true; }
void SetTestDir(std::filesystem::path TestDir)
{
ZEN_ASSERT(!m_Process.IsValid());
m_TestDir = TestDir;
}
void SpawnServer(int BasePort = 0);
void AttachToRunningServer(int BasePort = 0);
private:
ZenServerEnvironment& m_Env;
zen::ProcessHandle m_Process;
zen::Event m_ReadyEvent;
zen::Event m_ShutdownEvent;
bool m_Terminate = false;
std::filesystem::path m_TestDir;
bool m_MeshEnabled = false;
void CreateShutdownEvent(int BasePort);
};
/** Shared system state
*
* Used as a scratchpad to identify running instances etc
*
* The state lives in a memory-mapped file backed by the swapfile
*
*/
class ZenServerState
{
public:
ZenServerState();
~ZenServerState();
struct ZenServerEntry
{
std::atomic<uint32_t> Pid;
std::atomic<uint16_t> ListenPort;
std::atomic<uint16_t> Flags;
uint8_t SessionId[12];
uint8_t Padding[12];
enum class FlagsEnum : uint16_t
{
kShutdownPlease = 1 << 0
};
FRIEND_ENUM_CLASS_FLAGS(FlagsEnum);
void Reset();
void SignalShutdownRequest();
};
static_assert(sizeof(ZenServerEntry) == 32);
void Initialize();
[[nodiscard]] bool InitializeReadOnly();
[[nodiscard]] ZenServerEntry* Lookup(int ListenPort);
ZenServerEntry* Register(int ListenPort);
void Sweep();
void Snapshot(std::function<void(const ZenServerEntry&)>&& Callback);
private:
void* m_hMapFile = nullptr;
ZenServerEntry* m_Data;
int m_MaxEntryCount = 4096 / sizeof(ZenServerEntry);
ZenServerEntry* m_OurEntry = nullptr;
};
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