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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenstore/cas.h>
#include "CompactCas.h"
#include <zencore/except.h>
#include <zencore/filesystem.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
#include <zencore/memory.h>
#include <zencore/string.h>
#include <zencore/thread.h>
#include <zencore/uid.h>
#include <xxhash.h>
#include <gsl/gsl-lite.hpp>
#include <functional>
struct IUnknown; // Workaround for "combaseapi.h(229): error C2187: syntax error: 'identifier' was unexpected here" when using /permissive-
#include <atlfile.h>
#include <filesystem>
//////////////////////////////////////////////////////////////////////////
namespace zen {
using namespace fmt::literals;
uint32_t
CasLogFile::FileHeader::ComputeChecksum()
{
return XXH32(&this->Magic, sizeof(FileHeader) - 4, 0xC0C0'BABA);
}
CasLogFile::CasLogFile()
{
}
CasLogFile::~CasLogFile()
{
}
void
CasLogFile::Open(std::filesystem::path FileName, size_t RecordSize, bool IsCreate)
{
m_RecordSize = RecordSize;
const DWORD dwCreationDisposition = IsCreate ? CREATE_ALWAYS : OPEN_EXISTING;
HRESULT hRes = m_File.Create(FileName.c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, dwCreationDisposition);
if (FAILED(hRes))
{
throw std::system_error(GetLastError(), std::system_category(), "Failed to open log file '{}'"_format(FileName));
}
uint64_t AppendOffset = 0;
if (IsCreate)
{
// Initialize log by writing header
FileHeader Header = {.RecordSize = gsl::narrow<uint32_t>(RecordSize), .LogId = zen::Oid::NewOid(), .ValidatedTail = 0};
memcpy(Header.Magic, FileHeader::MagicSequence, sizeof Header.Magic);
Header.Finalize();
m_File.Write(&Header, sizeof Header);
AppendOffset = sizeof(FileHeader);
m_Header = Header;
}
else
{
// Validate header and log contents and prepare for appending/replay
FileHeader Header;
m_File.Read(&Header, sizeof Header);
if ((0 != memcmp(Header.Magic, FileHeader::MagicSequence, sizeof Header.Magic)) || (Header.Checksum != Header.ComputeChecksum()))
{
// TODO: provide more context!
throw std::runtime_error("Mangled log header");
}
ULONGLONG Sz;
m_File.GetSize(Sz);
AppendOffset = Sz;
m_Header = Header;
}
m_AppendOffset = AppendOffset;
}
void
CasLogFile::Close()
{
// TODO: update header and maybe add trailer
Flush();
m_File.Close();
}
void
CasLogFile::Replay(std::function<void(const void*)>&& Handler)
{
ULONGLONG LogFileSize;
m_File.GetSize(LogFileSize);
// Ensure we end up on a clean boundary
const uint64_t LogBaseOffset = sizeof(FileHeader);
const size_t LogEntryCount = (LogFileSize - LogBaseOffset) / m_RecordSize;
if (LogEntryCount == 0)
{
return;
}
const uint64_t LogDataSize = LogEntryCount * m_RecordSize;
std::vector<uint8_t> ReadBuffer;
ReadBuffer.resize(LogDataSize);
m_File.Seek(LogBaseOffset, FILE_BEGIN);
HRESULT hRes = m_File.Read(ReadBuffer.data(), gsl::narrow<DWORD>(LogDataSize));
if (FAILED(hRes))
{
zen::ThrowSystemException(hRes, "Failed to read log file");
}
for (int i = 0; i < LogEntryCount; ++i)
{
Handler(ReadBuffer.data() + (i * m_RecordSize));
}
}
void
CasLogFile::Append(const void* DataPointer, uint64_t DataSize)
{
HRESULT hRes = m_File.Write(DataPointer, gsl::narrow<DWORD>(DataSize));
if (FAILED(hRes))
{
zen::ThrowSystemException(hRes, "Failed to write to log file '{}'"_format(zen::PathFromHandle(m_File)));
}
}
void
CasLogFile::Flush()
{
m_File.Flush();
}
} // namespace zen
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