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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenutil/basicfile.h>
#include <zenutil/cache/rpcrecording.h>
ZEN_THIRD_PARTY_INCLUDES_START
#include <fmt/format.h>
#include <gsl/gsl-lite.hpp>
ZEN_THIRD_PARTY_INCLUDES_END
namespace zen::cache {
struct RecordedRequest
{
uint64_t Offset;
uint64_t Length;
ZenContentType ContentType;
ZenContentType AcceptType;
};
const uint64_t RecordedRequestBlockSize = 1ull << 31u;
struct RecordedRequestsWriter
{
void BeginWrite(const std::filesystem::path& BasePath)
{
m_BasePath = BasePath;
std::filesystem::create_directories(m_BasePath);
}
void EndWrite()
{
RwLock::ExclusiveLockScope _(m_Lock);
m_BlockFiles.clear();
IoBuffer IndexBuffer(IoBuffer::Wrap, m_Entries.data(), m_Entries.size() * sizeof(RecordedRequest));
BasicFile IndexFile;
IndexFile.Open(m_BasePath / "index.bin", BasicFile::Mode::kTruncate);
std::error_code Ec;
IndexFile.WriteAll(IndexBuffer, Ec);
IndexFile.Close();
m_Entries.clear();
}
uint64_t WriteRequest(ZenContentType ContentType, ZenContentType AcceptType, const IoBuffer& RequestBuffer)
{
RwLock::ExclusiveLockScope Lock(m_Lock);
uint64_t RequestIndex = m_Entries.size();
RecordedRequest& Entry = m_Entries.emplace_back(
RecordedRequest{.Offset = ~0ull, .Length = RequestBuffer.Size(), .ContentType = ContentType, .AcceptType = AcceptType});
if (Entry.Length < 1 * 1024 * 1024)
{
uint32_t BlockIndex = gsl::narrow<uint32_t>((m_ChunkOffset + Entry.Length) / RecordedRequestBlockSize);
if (BlockIndex == m_BlockFiles.size())
{
std::unique_ptr<BasicFile>& NewBlockFile = m_BlockFiles.emplace_back(std::make_unique<BasicFile>());
NewBlockFile->Open(m_BasePath / fmt::format("chunks{}.bin", BlockIndex), BasicFile::Mode::kTruncate);
m_ChunkOffset = BlockIndex * RecordedRequestBlockSize;
}
ZEN_ASSERT(BlockIndex < m_BlockFiles.size());
BasicFile* BlockFile = m_BlockFiles[BlockIndex].get();
ZEN_ASSERT(BlockFile != nullptr);
Entry.Offset = m_ChunkOffset;
m_ChunkOffset = RoundUp(m_ChunkOffset + Entry.Length, 1u << 4u);
Lock.ReleaseNow();
std::error_code Ec;
BlockFile->Write(RequestBuffer.Data(), RequestBuffer.Size(), Entry.Offset - BlockIndex * RecordedRequestBlockSize, Ec);
if (Ec)
{
Entry.Length = 0;
return ~0ull;
}
return RequestIndex;
}
Lock.ReleaseNow();
BasicFile RequestFile;
RequestFile.Open(m_BasePath / fmt::format("request{}.bin", RequestIndex), BasicFile::Mode::kTruncate);
std::error_code Ec;
RequestFile.WriteAll(RequestBuffer, Ec);
if (Ec)
{
Entry.Length = 0;
return ~0ull;
}
return RequestIndex;
}
std::filesystem::path m_BasePath;
mutable RwLock m_Lock;
std::vector<RecordedRequest> m_Entries;
std::vector<std::unique_ptr<BasicFile>> m_BlockFiles;
uint64_t m_ChunkOffset;
};
struct RecordedRequestsReader
{
uint64_t BeginRead(const std::filesystem::path& BasePath, bool InMemory)
{
m_BasePath = BasePath;
BasicFile IndexFile;
IndexFile.Open(m_BasePath / "index.bin", BasicFile::Mode::kRead);
m_Entries.resize(IndexFile.FileSize() / sizeof(RecordedRequest));
IndexFile.Read(m_Entries.data(), IndexFile.FileSize(), 0);
uint64_t MaxChunkPosition = 0;
for (const RecordedRequest& R : m_Entries)
{
if (R.Offset != ~0ull)
{
MaxChunkPosition = Max(MaxChunkPosition, R.Offset + R.Length);
}
}
uint32_t BlockCount = gsl::narrow<uint32_t>(MaxChunkPosition / RecordedRequestBlockSize) + 1;
m_BlockFiles.resize(BlockCount);
for (uint32_t BlockIndex = 0; BlockIndex < BlockCount; ++BlockIndex)
{
if (InMemory)
{
BasicFile Chunk;
Chunk.Open(m_BasePath / fmt::format("chunks{}.bin", BlockIndex), BasicFile::Mode::kRead);
m_BlockFiles[BlockIndex] = Chunk.ReadAll();
continue;
}
m_BlockFiles[BlockIndex] = IoBufferBuilder::MakeFromFile(m_BasePath / fmt::format("chunks{}.bin", BlockIndex));
}
return m_Entries.size();
}
void EndRead() { m_BlockFiles.clear(); }
std::pair<ZenContentType, ZenContentType> ReadRequest(uint64_t RequestIndex, IoBuffer& OutBuffer) const
{
if (RequestIndex >= m_Entries.size())
{
return {ZenContentType::kUnknownContentType, ZenContentType::kUnknownContentType};
}
const RecordedRequest& Entry = m_Entries[RequestIndex];
if (Entry.Length == 0)
{
return {ZenContentType::kUnknownContentType, ZenContentType::kUnknownContentType};
}
if (Entry.Offset != ~0ull)
{
uint32_t BlockIndex = gsl::narrow<uint32_t>((Entry.Offset + Entry.Length) / RecordedRequestBlockSize);
uint64_t ChunkOffset = Entry.Offset - (BlockIndex * RecordedRequestBlockSize);
OutBuffer = IoBuffer(m_BlockFiles[BlockIndex], ChunkOffset, Entry.Length);
return {Entry.ContentType, Entry.AcceptType};
}
OutBuffer = IoBufferBuilder::MakeFromFile(m_BasePath / fmt::format("request{}.bin", RequestIndex));
return {Entry.ContentType, Entry.AcceptType};
}
std::filesystem::path m_BasePath;
std::vector<RecordedRequest> m_Entries;
std::vector<IoBuffer> m_BlockFiles;
};
class DiskRequestRecorder : public IRpcRequestRecorder
{
public:
DiskRequestRecorder(const std::filesystem::path& BasePath) { m_RecordedRequests.BeginWrite(BasePath); }
virtual ~DiskRequestRecorder() { m_RecordedRequests.EndWrite(); }
private:
virtual uint64_t RecordRequest(const ZenContentType ContentType,
const ZenContentType AcceptType,
const IoBuffer& RequestBuffer) override
{
return m_RecordedRequests.WriteRequest(ContentType, AcceptType, RequestBuffer);
}
virtual void RecordResponse(uint64_t, const ZenContentType, const IoBuffer&) override {}
virtual void RecordResponse(uint64_t, const ZenContentType, const CompositeBuffer&) override {}
RecordedRequestsWriter m_RecordedRequests;
};
class DiskRequestReplayer : public IRpcRequestReplayer
{
public:
DiskRequestReplayer(const std::filesystem::path& BasePath, bool InMemory)
{
m_RequestCount = m_RequestBuffer.BeginRead(BasePath, InMemory);
}
virtual ~DiskRequestReplayer() { m_RequestBuffer.EndRead(); }
private:
virtual uint64_t GetRequestCount() const override { return m_RequestCount; }
virtual std::pair<ZenContentType, ZenContentType> GetRequest(uint64_t RequestIndex, IoBuffer& OutBuffer) override
{
return m_RequestBuffer.ReadRequest(RequestIndex, OutBuffer);
}
virtual ZenContentType GetResponse(uint64_t, IoBuffer&) override { return ZenContentType::kUnknownContentType; }
std::uint64_t m_RequestCount;
RecordedRequestsReader m_RequestBuffer;
};
std::unique_ptr<cache::IRpcRequestRecorder>
MakeDiskRequestRecorder(const std::filesystem::path& BasePath)
{
return std::make_unique<DiskRequestRecorder>(BasePath);
}
std::unique_ptr<cache::IRpcRequestReplayer>
MakeDiskRequestReplayer(const std::filesystem::path& BasePath, bool InMemory)
{
return std::make_unique<DiskRequestReplayer>(BasePath, InMemory);
}
} // namespace zen::cache
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