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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/zencore.h>
#include <zenstore/blockstore.h>
#include <zenstore/caslog.h>
#include <zenstore/gc.h>
#include "cas.h"
#include <atomic>
#include <limits>
#include <unordered_map>
namespace spdlog {
class logger;
}
namespace zen {
//////////////////////////////////////////////////////////////////////////
#pragma pack(push)
#pragma pack(1)
struct CasDiskIndexEntry
{
static const uint8_t kTombstone = 0x01;
IoHash Key;
BlockStoreDiskLocation Location;
ZenContentType ContentType = ZenContentType::kUnknownContentType;
uint8_t Flags = 0;
};
#pragma pack(pop)
static_assert(sizeof(CasDiskIndexEntry) == 32);
/** This implements a storage strategy for small CAS values
*
* New chunks are simply appended to a small object file, and an index is
* maintained to allow chunks to be looked up within the active small object
* files
*
*/
struct CasContainerStrategy final : public GcStorage
{
CasContainerStrategy(GcManager& Gc);
~CasContainerStrategy();
CasStore::InsertResult InsertChunk(IoBuffer Chunk, const IoHash& ChunkHash);
IoBuffer FindChunk(const IoHash& ChunkHash);
bool HaveChunk(const IoHash& ChunkHash);
void FilterChunks(HashKeySet& InOutChunks);
void Initialize(const std::filesystem::path& RootDirectory,
const std::string_view ContainerBaseName,
uint32_t MaxBlockSize,
uint64_t Alignment,
bool IsNewStore);
void Flush();
void Scrub(ScrubContext& Ctx);
virtual void CollectGarbage(GcContext& GcCtx) override;
virtual GcStorageSize StorageSize() const override { return {.DiskSize = m_TotalSize.load(std::memory_order::acquire)}; }
private:
CasStore::InsertResult InsertChunk(const void* ChunkData, size_t ChunkSize, const IoHash& ChunkHash);
void MakeIndexSnapshot();
uint64_t ReadIndexFile();
uint64_t ReadLog(uint64_t SkipEntryCount);
void OpenContainer(bool IsNewStore);
spdlog::logger& Log() { return m_Log; }
std::filesystem::path m_RootDirectory;
spdlog::logger& m_Log;
uint64_t m_PayloadAlignment = 1u << 4;
uint64_t m_MaxBlockSize = 1u << 28;
bool m_IsInitialized = false;
TCasLogFile<CasDiskIndexEntry> m_CasLog;
std::string m_ContainerBaseName;
std::filesystem::path m_BlocksBasePath;
BlockStore m_BlockStore;
RwLock m_LocationMapLock;
typedef std::unordered_map<IoHash, BlockStoreDiskLocation, IoHash::Hasher> LocationMap_t;
LocationMap_t m_LocationMap;
std::atomic_uint64_t m_TotalSize{};
};
void compactcas_forcelink();
} // namespace zen
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