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#include "yamr_table_reader.h"
#include <yt/cpp/mapreduce/common/helpers.h>
#include <yt/cpp/mapreduce/common/retry_lib.h>
#include <yt/cpp/mapreduce/raw_client/raw_requests.h>
////////////////////////////////////////////////////////////////////
static void CheckedSkip(IInputStream* input, size_t byteCount)
{
size_t skipped = input->Skip(byteCount);
Y_ENSURE(skipped == byteCount, "Premature end of YaMR stream");
}
////////////////////////////////////////////////////////////////////
namespace NYT {
using namespace NYT::NDetail::NRawClient;
////////////////////////////////////////////////////////////////////////////////
TYaMRTableReader::TYaMRTableReader(::TIntrusivePtr<TRawTableReader> input)
: TLenvalTableReader(std::move(input))
{ }
TYaMRTableReader::~TYaMRTableReader()
{ }
const TYaMRRow& TYaMRTableReader::GetRow() const
{
CheckValidity();
if (!RowTaken_) {
const_cast<TYaMRTableReader*>(this)->ReadRow();
}
return Row_;
}
bool TYaMRTableReader::IsValid() const
{
return Valid_;
}
void TYaMRTableReader::Next()
{
TLenvalTableReader::Next();
}
void TYaMRTableReader::NextKey()
{
TLenvalTableReader::NextKey();
}
ui32 TYaMRTableReader::GetTableIndex() const
{
return TLenvalTableReader::GetTableIndex();
}
ui32 TYaMRTableReader::GetRangeIndex() const
{
return TLenvalTableReader::GetRangeIndex();
}
ui64 TYaMRTableReader::GetRowIndex() const
{
return TLenvalTableReader::GetRowIndex();
}
TMaybe<size_t> TYaMRTableReader::GetReadByteCount() const
{
return TLenvalTableReader::GetReadByteCount();
}
bool TYaMRTableReader::IsEndOfStream() const
{
return TLenvalTableReader::IsEndOfStream();
}
bool TYaMRTableReader::IsRawReaderExhausted() const
{
return TLenvalTableReader::IsRawReaderExhausted();
}
void TYaMRTableReader::ReadField(TString* result, i32 length)
{
result->resize(length);
size_t count = Input_.Load(result->begin(), length);
Y_ENSURE(count == static_cast<size_t>(length), "Premature end of YaMR stream");
}
void TYaMRTableReader::ReadRow()
{
while (true) {
try {
i32 value = static_cast<i32>(Length_);
ReadField(&Key_, value);
Row_.Key = Key_;
ReadInteger(&value);
ReadField(&SubKey_, value);
Row_.SubKey = SubKey_;
ReadInteger(&value);
ReadField(&Value_, value);
Row_.Value = Value_;
RowTaken_ = true;
// We successfully parsed one more row from the stream,
// so reset retry count to their initial value.
Input_.ResetRetries();
break;
} catch (const std::exception& ex) {
if (!TLenvalTableReader::Retry(std::make_exception_ptr(ex))) {
throw;
}
}
}
}
void TYaMRTableReader::SkipRow()
{
while (true) {
try {
i32 value = static_cast<i32>(Length_);
CheckedSkip(&Input_, value);
ReadInteger(&value);
CheckedSkip(&Input_, value);
ReadInteger(&value);
CheckedSkip(&Input_, value);
break;
} catch (const std::exception& ex) {
if (!TLenvalTableReader::Retry(std::make_exception_ptr(ex))) {
throw;
}
}
}
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
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