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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/zencore.h>
#include <zenstore/basicfile.h>
#include <zenstore/cas.h>
#include <zenstore/caslog.h>
#include <zenstore/gc.h>
#include <atomic>
#include <unordered_map>
namespace spdlog {
class logger;
}
namespace zen {
class ChunkBundlerValidator
{
public:
virtual bool ValidateChunk(IoBuffer Buffer, IoHash Key) = 0;
};
#pragma pack(push)
#pragma pack(1)
struct CompactDiskLocation
{
uint16_t BlockIndex;
uint32_t Offset;
uint32_t Size;
};
struct CompactDiskIndexEntry
{
static const uint8_t kTombstone = 0x01;
IoHash Key;
CompactDiskLocation Location;
ZenContentType ContentType = ZenContentType::kUnknownContentType;
uint8_t Flags = 0;
};
#pragma pack(pop)
static_assert(sizeof(CompactDiskIndexEntry) == 32);
class ChunkBundler final
{
public:
ChunkBundler(std::filesystem::path RootDirectory, ChunkBundlerValidator* Validator);
~ChunkBundler();
struct InsertResult
{
bool New = false;
};
void Initialize(const std::string_view ContainerBaseName, uint64_t MaxBlockSize, uint64_t Alignment, bool IsNewStore);
InsertResult InsertChunk(const void* ChunkData, size_t ChunkSize, const IoHash& ChunkHash);
InsertResult InsertChunk(IoBuffer Chunk, const IoHash& ChunkHash);
IoBuffer FindChunk(const IoHash& ChunkHash);
bool HaveChunk(const IoHash& ChunkHash);
void FilterChunks(CasChunkSet& InOutChunks);
void Flush();
void Scrub(ScrubContext& Ctx);
void CollectGarbage(GcContext& GcCtx);
GcStorageSize StorageSize() const;
private:
spdlog::logger& Log() { return m_Log; }
ChunkBundlerValidator* m_Validator;
spdlog::logger& m_Log;
uint64_t m_PayloadAlignment = 1 << 4;
uint64_t m_MaxBlockSize = 1L << 30; // 1 Gb
bool m_IsInitialized = false;
BasicFile m_SmallObjectIndex;
std::filesystem::path RootDirectory;
TCasLogFile<CompactDiskIndexEntry> m_OpLog;
std::filesystem::path m_RootDirectory;
std::string m_ContainerBaseName;
RwLock m_LocationMapLock;
std::unordered_map<IoHash, CompactDiskLocation, IoHash::Hasher> m_LocationMap;
std::unordered_map<uint16_t, std::shared_ptr<BasicFile>> m_OpenBlocks;
uint16_t m_CurrentFileIndex = 0;
RwLock m_InsertLock; // used to serialize inserts
std::weak_ptr<BasicFile> m_CurrentBlock;
std::atomic_uint32_t m_CurrentInsertOffset{};
std::atomic_uint64_t m_CurrentIndexOffset{};
std::atomic_uint64_t m_TotalSize{};
void MakeIndexSnapshot();
};
//////////////////////////////////////////////////////////////////////////
void chunkbundler_forcelink();
} // namespace zen
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