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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/zencore.h>
#include <zencore/iobuffer.h>
#include <zencore/iohash.h>
#include <zencore/string.h>
#include <zencore/thread.h>
#include <zencore/uid.h>
#include <zencore/windows.h>
#include <zenstore/basicfile.h>
#include <zenstore/cas.h>
#include <zenstore/caslog.h>
namespace zen {
//////////////////////////////////////////////////////////////////////////
#pragma pack(push)
#pragma pack(1)
struct CasDiskLocation
{
uint64_t Offset;
// If we wanted to be able to store larger chunks using this storage mechanism then
// we could make this more like the IoStore index so we can store larger chunks.
// I.e use five bytes for size and seven for offset
uint32_t Size;
};
struct CasDiskIndexEntry
{
IoHash Key;
CasDiskLocation Location;
};
#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
{
CasContainerStrategy(const CasStoreConfiguration& Config);
~CasContainerStrategy();
CasStore::InsertResult InsertChunk(const void* ChunkData, size_t ChunkSize, const IoHash& ChunkHash);
CasStore::InsertResult InsertChunk(IoBuffer Chunk, const IoHash& chunkHash);
IoBuffer FindChunk(const IoHash& ChunkHash);
bool HaveChunk(const IoHash& ChunkHash);
void FilterChunks(CasChunkSet& InOutChunks);
void Initialize(const std::string_view ContainerBaseName, uint64_t Alignment, bool IsNewStore);
void Flush();
void Scrub(ScrubContext& Ctx);
private:
const CasStoreConfiguration& m_Config;
uint64_t m_PayloadAlignment = 1 << 4;
bool m_IsInitialized = false;
BasicFile m_SmallObjectFile;
BasicFile m_SmallObjectIndex;
TCasLogFile<CasDiskIndexEntry> m_CasLog;
RwLock m_LocationMapLock;
std::unordered_map<IoHash, CasDiskLocation, IoHash::Hasher> m_LocationMap;
RwLock m_InsertLock; // used to serialize inserts
std::atomic<uint64_t> m_CurrentInsertOffset = 0;
std::atomic<uint64_t> m_CurrentIndexOffset = 0;
void MakeSnapshot();
};
} // namespace zen
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