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#include "merge.h"
#include "state.h"
#include "data_ptr.h"
#include <library/cpp/xdelta3/xdelta_codec/codec.h>
#include <library/cpp/xdelta3/state/hash.h>
#include <util/digest/murmur.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
namespace NXdeltaAggregateColumn {
static ui8* AllocateFromContext(XDeltaContext* context, size_t size)
{
if (!context) {
return reinterpret_cast<ui8*>(malloc(size));
}
return reinterpret_cast<ui8*>(context->allocate(context->opaque, size));
}
bool EncodeHeaderTo(const TStateHeader& header, ui8* data, size_t size, size_t& resultSize);
bool EncodeErrorHeader(XDeltaContext* context, NProtoBuf::Arena& arena, TStateHeader::EErrorCode error, TSpan* result)
{
result->Offset = result->Size = 0;
auto header = NProtoBuf::Arena::CreateMessage<NXdeltaAggregateColumn::TStateHeader>(&arena);
header->set_error_code(error);
auto headerSize = SizeOfHeader(*header);
auto data = TDataPtr(AllocateFromContext(context, headerSize), TDeleter(context));
if (EncodeHeaderTo(*header, data.get(), headerSize, result->Size)) {
result->Offset = 0;
result->Data = data.release();
return true;
}
return false;
}
bool EncodeState(XDeltaContext* context, NProtoBuf::Arena& arena, const TState& state, TSpan* result)
{
auto headerSize = SizeOfHeader(state.Header());
result->Size = headerSize + state.PayloadSize();
auto data = TDataPtr(AllocateFromContext(context, result->Size), TDeleter(context));
size_t written = 0;
if (EncodeHeaderTo(state.Header(), data.get(), result->Size, written)) {
if (state.PayloadSize() && state.PayloadData()) {
memcpy(data.get() + headerSize, state.PayloadData(), state.PayloadSize());
}
result->Data = data.release();
return true;
}
return EncodeErrorHeader(context, arena, TStateHeader::PROTOBUF_ERROR, result);
}
// NOTE: empty (data_size == 0) patch means nothing changed.
// empty valid patch and will be ignored unless will raise error
bool IsBadEmptyPatch(const TState& empty)
{
return 0u == empty.PayloadSize() && empty.Header().base_hash() != empty.Header().state_hash();
}
bool MergePatches(XDeltaContext* context, NProtoBuf::Arena& arena, const TState& lhs, const TState& rhs, TSpan* result)
{
if (lhs.Header().state_hash() != rhs.Header().base_hash()) {
return EncodeErrorHeader(context, arena, TStateHeader::MERGE_PATCHES_ERROR, result);
}
if (IsBadEmptyPatch(lhs) || IsBadEmptyPatch(rhs)) {
return EncodeErrorHeader(context, arena, TStateHeader::MERGE_PATCHES_ERROR, result);
}
if (0u == lhs.PayloadSize()) {
return EncodeState(context, arena, rhs, result);
}
if (0u == rhs.PayloadSize()) {
return EncodeState(context, arena, lhs, result);
}
auto merged = NProtoBuf::Arena::CreateMessage<TStateHeader>(&arena);
merged->set_type(TStateHeader::PATCH);
merged->set_base_hash(lhs.Header().base_hash());
merged->set_state_hash(rhs.Header().state_hash());
merged->set_state_size(rhs.Header().state_size());
size_t patchSize = 0;
auto maxMergedHeaderSize = SizeOfHeader(*merged) + sizeof(patchSize); // estimation should be valid: sizeof(ui64 patchSize) covers possible sizeOfHeaderSize growth (+1)
// as well as ui32 data_size which is unset at this point
auto patch = TDataPtr(MergePatches(
context,
maxMergedHeaderSize,
lhs.PayloadData(),
lhs.PayloadSize(),
rhs.PayloadData(),
rhs.PayloadSize(),
&patchSize),
TDeleter(context));
if (!patch) {
return EncodeErrorHeader(context, arena, TStateHeader::MERGE_PATCHES_ERROR, result);
}
merged->set_data_size(patchSize);
auto mergedHeaderSize = SizeOfHeader(*merged);
Y_ENSURE(maxMergedHeaderSize >= mergedHeaderSize);
auto offset = maxMergedHeaderSize - mergedHeaderSize;
size_t headerSize = 0;
if (!EncodeHeaderTo(*merged, patch.get() + offset, mergedHeaderSize, headerSize)) {
return EncodeErrorHeader(context, arena, TStateHeader::PROTOBUF_ERROR, result);
}
result->Size = mergedHeaderSize + patchSize;
result->Offset = offset;
result->Data = patch.release();
return true;
}
bool ApplyPatch(XDeltaContext* context, NProtoBuf::Arena& arena, const TState& base, const TState& patch, TSpan* result)
{
auto baseHash = base.CalcHash();
if (baseHash != patch.Header().base_hash()) {
return EncodeErrorHeader(context, arena, TStateHeader::BASE_HASH_ERROR, result);
}
if (patch.Header().data_size() == 0) {
if (patch.Header().state_size() == base.Header().data_size()) {
if (patch.Header().state_hash() == baseHash) {
return EncodeState(context, arena, base, result);
}
return EncodeErrorHeader(context, arena, TStateHeader::STATE_HASH_ERROR, result);
}
return EncodeErrorHeader(context, arena, TStateHeader::STATE_SIZE_ERROR, result);
}
size_t stateSize = 0;
auto merged = NProtoBuf::Arena::CreateMessage<TStateHeader>(&arena);
merged->set_type(TStateHeader::BASE);
auto maxHeaderSize = SizeOfHeader(*merged) + sizeof(stateSize);
auto state = TDataPtr(ApplyPatch(
context,
maxHeaderSize,
base.PayloadData(),
base.PayloadSize(),
patch.PayloadData(),
patch.PayloadSize(),
patch.Header().state_size(),
&stateSize),
TDeleter(context));
if (!state) {
return EncodeErrorHeader(context, arena, TStateHeader::APPLY_PATCH_ERROR, result);
}
if (stateSize != patch.Header().state_size()) {
return EncodeErrorHeader(context, arena, TStateHeader::STATE_SIZE_ERROR, result);
}
auto stateHash = CalcHash(state.get() + maxHeaderSize, stateSize);
if (stateHash != patch.Header().state_hash()) {
return EncodeErrorHeader(context, arena, TStateHeader::STATE_HASH_ERROR, result);
}
merged->set_data_size(stateSize);
auto mergedHeaderSize = SizeOfHeader(*merged);
auto offset = maxHeaderSize - mergedHeaderSize;
size_t headerSize = 0;
if (!EncodeHeaderTo(*merged, state.get() + offset, mergedHeaderSize, headerSize)) {
return EncodeErrorHeader(context, arena, TStateHeader::PROTOBUF_ERROR, result);
}
result->Size = mergedHeaderSize + stateSize;
result->Offset = offset;
result->Data = state.release();
return true;
}
int MergeStates(XDeltaContext* context, const ui8* lhsData, size_t lhsSize, const ui8* rhsData, size_t rhsSize, TSpan* result)
{
using namespace NXdeltaAggregateColumn;
using namespace NProtoBuf::io;
result->Data = nullptr;
result->Size = 0;
result->Offset = 0;
NProtoBuf::ArenaOptions options;
options.initial_block_size = ArenaMaxSize;
auto buffer = TDataPtr(AllocateFromContext(context, options.initial_block_size), TDeleter(context));
options.initial_block = reinterpret_cast<char*>(buffer.get());
NProtoBuf::Arena arena(options);
TState rhs(arena, rhsData, rhsSize);
if (rhs.Header().has_error_code()) {
return EncodeErrorHeader(context, arena, rhs.Error(), result);
}
if (rhs.Type() == TStateHeader::BASE) {
result->Data = rhsData;
result->Size = rhsSize;
return true;
}
TState lhs(arena, lhsData, lhsSize);
if (lhs.Header().has_error_code()) {
return EncodeErrorHeader(context, arena, lhs.Error(), result);
}
if (lhs.Type() == TStateHeader::PATCH && rhs.Type() == TStateHeader::PATCH) {
return MergePatches(context, arena, lhs, rhs, result);
} else if (lhs.Type() == TStateHeader::BASE && rhs.Type() == TStateHeader::PATCH) {
return ApplyPatch(context, arena, lhs, rhs, result);
}
return EncodeErrorHeader(context, arena, TStateHeader::YT_MERGE_ERROR, result);
}
}
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