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// Copyright Epic Games, Inc. All Rights Reserved.
#include "storageserverinstance.h"
#include "hydration.h"
#include <zencore/assertfmt.h>
#include <zencore/filesystem.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
namespace zen {
StorageServerInstance::StorageServerInstance(ZenServerEnvironment& RunEnvironment,
std::string_view ModuleId,
std::filesystem::path FileHydrationPath,
std::filesystem::path HydrationTempPath)
: m_ModuleId(ModuleId)
, m_ServerInstance(RunEnvironment, ZenServerInstance::ServerMode::kStorageServer)
, m_HydrationPath(FileHydrationPath)
{
m_BaseDir = RunEnvironment.CreateChildDir(ModuleId);
m_TempDir = HydrationTempPath / ModuleId;
}
StorageServerInstance::~StorageServerInstance()
{
}
void
StorageServerInstance::SpawnServerProcess()
{
ZEN_ASSERT_FORMAT(!m_ServerInstance.IsRunning(), "Storage server instance for module '{}' is already running", m_ModuleId);
m_ServerInstance.SetServerExecutablePath(GetRunningExecutablePath());
m_ServerInstance.SetDataDir(m_BaseDir);
#if ZEN_PLATFORM_WINDOWS
m_ServerInstance.SetJobObject(m_JobObject);
#endif
const uint16_t BasePort = m_ServerInstance.SpawnServerAndWaitUntilReady();
ZEN_DEBUG("Storage server instance for module '{}' started, listening on port {}", m_ModuleId, BasePort);
m_ServerInstance.EnableShutdownOnDestroy();
}
void
StorageServerInstance::Provision()
{
RwLock::ExclusiveLockScope _(m_Lock);
if (m_IsProvisioned)
{
ZEN_WARN("Storage server instance for module '{}' is already provisioned", m_ModuleId);
return;
}
if (m_IsHibernated)
{
WakeLocked();
}
else
{
ZEN_INFO("Provisioning storage server instance for module '{}', at '{}'", m_ModuleId, m_BaseDir);
Hydrate();
SpawnServerProcess();
}
m_IsProvisioned = true;
}
void
StorageServerInstance::Deprovision()
{
RwLock::ExclusiveLockScope _(m_Lock);
if (!m_IsProvisioned)
{
ZEN_WARN("Attempted to deprovision storage server instance for module '{}' which is not provisioned", m_ModuleId);
return;
}
ZEN_INFO("Deprovisioning storage server instance for module '{}'", m_ModuleId);
m_ServerInstance.Shutdown();
Dehydrate();
m_IsProvisioned = false;
}
void
StorageServerInstance::Hibernate()
{
// Signal server to shut down, but keep data around for later wake
RwLock::ExclusiveLockScope _(m_Lock);
if (!m_IsProvisioned)
{
ZEN_WARN("Attempted to hibernate storage server instance for module '{}' which is not provisioned", m_ModuleId);
return;
}
if (m_IsHibernated)
{
ZEN_WARN("Storage server instance for module '{}' is already hibernated", m_ModuleId);
return;
}
if (!m_ServerInstance.IsRunning())
{
ZEN_WARN("Attempted to hibernate storage server instance for module '{}' which is not running", m_ModuleId);
// This is an unexpected state. Should consider the instance invalid?
return;
}
try
{
m_ServerInstance.Shutdown();
m_IsHibernated = true;
m_IsProvisioned = false;
return;
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Failed to hibernate storage server instance for module '{}': {}", m_ModuleId, Ex.what());
}
}
void
StorageServerInstance::Wake()
{
RwLock::ExclusiveLockScope _(m_Lock);
WakeLocked();
}
void
StorageServerInstance::WakeLocked()
{
// Start server in-place using existing data
if (!m_IsHibernated)
{
ZEN_WARN("Attempted to wake storage server instance for module '{}' which is not hibernated", m_ModuleId);
return;
}
ZEN_ASSERT_FORMAT(!m_ServerInstance.IsRunning(), "Storage server instance for module '{}' is already running", m_ModuleId);
try
{
SpawnServerProcess();
m_IsHibernated = false;
}
catch (const std::exception& Ex)
{
ZEN_ERROR("Failed to wake storage server instance for module '{}': {}", m_ModuleId, Ex.what());
// TODO: this instance should be marked as invalid
}
}
void
StorageServerInstance::Hydrate()
{
HydrationConfig Config{.ServerStateDir = m_BaseDir,
.TempDir = m_TempDir,
.ModuleId = m_ModuleId,
.TargetSpecification = WideToUtf8(m_HydrationPath.native())};
std::unique_ptr<HydrationStrategyBase> Hydrator = CreateFileHydrator();
Hydrator->Configure(Config);
Hydrator->Hydrate();
}
void
StorageServerInstance::Dehydrate()
{
HydrationConfig Config{.ServerStateDir = m_BaseDir,
.TempDir = m_TempDir,
.ModuleId = m_ModuleId,
.TargetSpecification = WideToUtf8(m_HydrationPath.native())};
std::unique_ptr<HydrationStrategyBase> Hydrator = CreateFileHydrator();
Hydrator->Configure(Config);
Hydrator->Dehydrate();
}
} // namespace zen
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