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// Copyright Epic Games, Inc. All Rights Reserved.
#include "zenstore/cidstore.h"
#include <zencore/compress.h>
#include <zencore/filesystem.h>
#include <zencore/logging.h>
#include <zenstore/CAS.h>
#include <zenstore/caslog.h>
#include <filesystem>
namespace zen {
struct CidStore::CidState
{
CidState(CasStore& InCasStore) : m_CasStore(InCasStore) {}
struct IndexEntry
{
IoHash Uncompressed;
IoHash Compressed;
};
CasStore& m_CasStore;
TCasLogFile<IndexEntry> m_LogFile;
RwLock m_Lock;
tsl::robin_map<IoHash, IoHash> m_CidMap;
CidStore::InsertResult AddChunk(CompressedBuffer& ChunkData)
{
const IoHash DecompressedId = IoHash::FromBLAKE3(ChunkData.GetRawHash());
IoBuffer Payload = ChunkData.GetCompressed().Flatten().AsIoBuffer();
IoHash CompressedHash = IoHash::HashBuffer(Payload.Data(), Payload.Size());
CasStore::InsertResult Result = m_CasStore.InsertChunk(Payload, CompressedHash);
AddCompressedCid(DecompressedId, CompressedHash);
return {.DecompressedId = DecompressedId, .CompressedHash = CompressedHash, .New = Result.New};
}
void AddCompressedCid(const IoHash& DecompressedId, const IoHash& Compressed)
{
RwLock::ExclusiveLockScope _(m_Lock);
m_CidMap.insert_or_assign(DecompressedId, Compressed);
// TODO: it's pretty wasteful to log even idempotent updates
// however we can't simply use the boolean returned by insert_or_assign
// since there's not a 1:1 mapping between compressed and uncompressed
// so if we want a last-write-wins policy then we have to log each update
m_LogFile.Append({.Uncompressed = DecompressedId, .Compressed = Compressed});
}
IoBuffer FindChunkByCid(const IoHash& DecompressedId)
{
IoHash CompressedHash;
{
RwLock::SharedLockScope _(m_Lock);
if (auto It = m_CidMap.find(DecompressedId); It != m_CidMap.end())
{
CompressedHash = It->second;
}
}
if (CompressedHash != IoHash::Zero)
{
return m_CasStore.FindChunk(CompressedHash);
}
return IoBuffer();
}
bool ContainsChunk(const IoHash& DecompressedId)
{
RwLock::SharedLockScope _(m_Lock);
return m_CidMap.find(DecompressedId) != m_CidMap.end();
}
void InitializeIndex(const std::filesystem::path& RootDir)
{
zen::CreateDirectories(RootDir);
std::filesystem::path SlogPath{RootDir / "cid.slog"};
bool IsNew = !std::filesystem::exists(SlogPath);
m_LogFile.Open(SlogPath, IsNew);
m_LogFile.Replay([&](const IndexEntry& Ie) { m_CidMap.insert_or_assign(Ie.Uncompressed, Ie.Compressed); });
ZEN_DEBUG("CID index initialized: {} entries found", m_CidMap.size());
}
void Flush() { m_LogFile.Flush(); }
};
//////////////////////////////////////////////////////////////////////////
CidStore::CidStore(CasStore& InCasStore, const std::filesystem::path& RootDir) : m_Impl(std::make_unique<CidState>(InCasStore))
{
m_Impl->InitializeIndex(RootDir);
}
CidStore::~CidStore()
{
}
CidStore::InsertResult
CidStore::AddChunk(CompressedBuffer& ChunkData)
{
return m_Impl->AddChunk(ChunkData);
}
void
CidStore::AddCompressedCid(const IoHash& DecompressedId, const IoHash& Compressed)
{
m_Impl->AddCompressedCid(DecompressedId, Compressed);
}
IoBuffer
CidStore::FindChunkByCid(const IoHash& DecompressedId)
{
return m_Impl->FindChunkByCid(DecompressedId);
}
bool
CidStore::ContainsChunk(const IoHash& DecompressedId)
{
return m_Impl->ContainsChunk(DecompressedId);
}
void
CidStore::Flush()
{
m_Impl->Flush();
}
} // namespace zen
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