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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenstore/cas.h>
#include "compactcas.h"
#include "filecas.h"
#include <zencore/except.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
#include <zencore/memory.h>
#include <zencore/string.h>
#include <zencore/testing.h>
#include <zencore/testutils.h>
#include <zencore/thread.h>
#include <zencore/uid.h>
#include <gsl/gsl-lite.hpp>
#include <filesystem>
#include <functional>
#include <unordered_map>
//////////////////////////////////////////////////////////////////////////
namespace zen {
void
ScrubContext::ReportBadChunks(std::span<IoHash> BadChunks)
{
ZEN_UNUSED(BadChunks);
}
/**
* CAS store implementation
*
* Uses a basic strategy of splitting payloads by size, to improve ability to reclaim space
* quickly for unused large chunks and to maintain locality for small chunks which are
* frequently accessed together.
*
*/
class CasImpl : public CasStore
{
public:
CasImpl();
virtual ~CasImpl();
virtual void Initialize(const CasStoreConfiguration& InConfig) override;
virtual CasStore::InsertResult InsertChunk(IoBuffer Chunk, const IoHash& ChunkHash) override;
virtual IoBuffer FindChunk(const IoHash& ChunkHash) override;
virtual void FilterChunks(CasChunkSet& InOutChunks) override;
virtual void Flush() override;
virtual void Scrub(ScrubContext& Ctx) override;
private:
CasContainerStrategy m_TinyStrategy;
CasContainerStrategy m_SmallStrategy;
FileCasStrategy m_LargeStrategy;
};
CasImpl::CasImpl() : m_TinyStrategy(m_Config), m_SmallStrategy(m_Config), m_LargeStrategy(m_Config)
{
}
CasImpl::~CasImpl()
{
}
void
CasImpl::Initialize(const CasStoreConfiguration& InConfig)
{
m_Config = InConfig;
ZEN_INFO("initializing CAS pool at '{}'", m_Config.RootDirectory);
// Ensure root directory exists - create if it doesn't exist already
std::filesystem::create_directories(m_Config.RootDirectory);
// Open or create manifest
//
// The manifest is not currently fully implemented. The goal is to
// use it for recovery and configuration
bool IsNewStore = false;
{
std::filesystem::path ManifestPath = m_Config.RootDirectory;
ManifestPath /= ".ucas_root";
std::error_code Ec;
BasicFile Marker;
Marker.Open(ManifestPath.c_str(), /* IsCreate */ false, Ec);
if (Ec)
{
IsNewStore = true;
ExtendableStringBuilder<128> manifest;
manifest.Append("#CAS_ROOT\n");
manifest.Append("ID=");
zen::Oid id = zen::Oid::NewOid();
id.ToString(manifest);
Marker.Open(ManifestPath.c_str(), /* IsCreate */ true);
Marker.Write(manifest.c_str(), (DWORD)manifest.Size(), 0);
}
}
// Initialize payload storage
m_TinyStrategy.Initialize("tobs", 16, IsNewStore);
m_SmallStrategy.Initialize("sobs", 4096, IsNewStore);
ScrubContext Ctx;
Scrub(Ctx);
}
CasStore::InsertResult
CasImpl::InsertChunk(IoBuffer Chunk, const IoHash& ChunkHash)
{
const uint64_t ChunkSize = Chunk.Size();
if (ChunkSize < m_Config.TinyValueThreshold)
{
ZEN_ASSERT(ChunkSize);
return m_TinyStrategy.InsertChunk(Chunk, ChunkHash);
}
else if (ChunkSize < m_Config.HugeValueThreshold)
{
return m_SmallStrategy.InsertChunk(Chunk, ChunkHash);
}
return m_LargeStrategy.InsertChunk(Chunk, ChunkHash);
}
IoBuffer
CasImpl::FindChunk(const IoHash& ChunkHash)
{
if (IoBuffer Found = m_SmallStrategy.FindChunk(ChunkHash))
{
return Found;
}
if (IoBuffer Found = m_TinyStrategy.FindChunk(ChunkHash))
{
return Found;
}
if (IoBuffer Found = m_LargeStrategy.FindChunk(ChunkHash))
{
return Found;
}
// Not found
return IoBuffer{};
}
void
CasImpl::FilterChunks(CasChunkSet& InOutChunks)
{
m_SmallStrategy.FilterChunks(InOutChunks);
m_TinyStrategy.FilterChunks(InOutChunks);
m_LargeStrategy.FilterChunks(InOutChunks);
}
void
CasImpl::Flush()
{
m_SmallStrategy.Flush();
m_TinyStrategy.Flush();
m_LargeStrategy.Flush();
}
void
CasImpl::Scrub(ScrubContext& Ctx)
{
m_SmallStrategy.Scrub(Ctx);
m_TinyStrategy.Scrub(Ctx);
m_LargeStrategy.Scrub(Ctx);
}
//////////////////////////////////////////////////////////////////////////
CasStore*
CreateCasStore()
{
return new CasImpl();
}
//////////////////////////////////////////////////////////////////////////
//
// Testing related code follows...
//
#if ZEN_WITH_TESTS
TEST_CASE("CasStore")
{
ScopedTemporaryDirectory TempDir;
zen::CasStoreConfiguration config;
config.RootDirectory = TempDir.Path();
std::unique_ptr<zen::CasStore> Store{CreateCasStore()};
Store->Initialize(config);
ScrubContext Ctx;
Store->Scrub(Ctx);
IoBuffer Value1{16};
memcpy(Value1.MutableData(), "1234567890123456", 16);
IoHash Hash1 = IoHash::HashBuffer(Value1.Data(), Value1.Size());
CasStore::InsertResult Result1 = Store->InsertChunk(Value1, Hash1);
CHECK(Result1.New);
IoBuffer Value2{16};
memcpy(Value2.MutableData(), "ABCDEFGHIJKLMNOP", 16);
IoHash Hash2 = IoHash::HashBuffer(Value2.Data(), Value2.Size());
CasStore::InsertResult Result2 = Store->InsertChunk(Value2, Hash2);
CHECK(Result2.New);
CasChunkSet ChunkSet;
ChunkSet.AddChunk(Hash1);
ChunkSet.AddChunk(Hash2);
Store->FilterChunks(ChunkSet);
CHECK(ChunkSet.GetChunkSet().size() == 0);
IoBuffer Lookup1 = Store->FindChunk(Hash1);
CHECK(Lookup1);
IoBuffer Lookup2 = Store->FindChunk(Hash2);
CHECK(Lookup2);
}
void
CAS_forcelink()
{
}
#endif
} // namespace zen
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