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#include "tagged_payload.h"
#include "private.h"
#include <library/cpp/yt/assert/assert.h>
#include <library/cpp/yt/misc/tls.h>
#include <util/system/compiler.h>
#include <util/system/types.h>
#include <util/generic/bitops.h>
#include <algorithm>
namespace NYT::NLogging {
////////////////////////////////////////////////////////////////////////////////
namespace {
struct TPerThreadCache;
YT_DEFINE_THREAD_LOCAL(TPerThreadCache*, Cache);
YT_DEFINE_THREAD_LOCAL(bool, CacheDestroyed);
struct TPerThreadCache
{
TSharedMutableRef Chunk;
size_t ChunkOffset = 0;
~TPerThreadCache()
{
TTaggedPayloadBuilder::DisablePerThreadCache();
}
static YT_PREVENT_TLS_CACHING TPerThreadCache* GetCache()
{
auto& cache = Cache();
[[likely]] if (cache) {
return cache;
}
if (CacheDestroyed()) {
return nullptr;
}
static thread_local TPerThreadCache CacheData;
cache = &CacheData;
return cache;
}
};
TSharedMutableRef AllocateChunk(size_t size)
{
return TSharedMutableRef::Allocate<::NYT::NLogging::NDetail::TMessageBufferTag>(size, {.InitializeStorage = false});
}
} // namespace
////////////////////////////////////////////////////////////////////////////////
void TTaggedPayloadBuilder::DisablePerThreadCache()
{
Cache() = nullptr;
CacheDestroyed() = true;
}
void TTaggedPayloadBuilder::DoReset()
{
Buffer_.Reset();
}
void TTaggedPayloadBuilder::DoReserve(size_t newCapacity)
{
auto oldLength = GetLength();
newCapacity = FastClp2(newCapacity);
auto newChunkSize = std::max(ChunkSize, newCapacity);
// Hold the old buffer until the data is copied.
auto oldBuffer = std::move(Buffer_);
auto* cache = TPerThreadCache::GetCache();
[[likely]] if (cache) {
auto oldCapacity = End_ - Begin_;
auto deltaCapacity = newCapacity - oldCapacity;
if (End_ == cache->Chunk.Begin() + cache->ChunkOffset &&
cache->ChunkOffset + deltaCapacity <= cache->Chunk.Size())
{
// Resize inplace.
Buffer_ = cache->Chunk.Slice(cache->ChunkOffset - oldCapacity, cache->ChunkOffset + deltaCapacity);
cache->ChunkOffset += deltaCapacity;
End_ = Begin_ + newCapacity;
return;
}
[[unlikely]] if (cache->ChunkOffset + newCapacity > cache->Chunk.Size()) {
cache->Chunk = AllocateChunk(newChunkSize);
cache->ChunkOffset = 0;
}
Buffer_ = cache->Chunk.Slice(cache->ChunkOffset, cache->ChunkOffset + newCapacity);
cache->ChunkOffset += newCapacity;
} else {
Buffer_ = AllocateChunk(newChunkSize);
newCapacity = newChunkSize;
}
if (oldLength > 0) {
::memcpy(Buffer_.Begin(), Begin_, oldLength);
}
Begin_ = Buffer_.Begin();
End_ = Begin_ + newCapacity;
}
////////////////////////////////////////////////////////////////////////////////
void TTaggedPayloadWriter::DisablePerThreadCache()
{
TTaggedPayloadBuilder::DisablePerThreadCache();
}
////////////////////////////////////////////////////////////////////////////////
TTaggedPayloadReader::TTaggedPayloadReader(const TTaggedLogEventPayload& payload)
: Current_(payload.Underlying().Begin())
, End_(payload.Underlying().End())
{ }
TStringBuf TTaggedPayloadReader::ReadMessage()
{
YT_ASSERT(!MessageRead_);
MessageRead_ = true;
return ReadString();
}
std::optional<TTaggedPayloadReader::TTag> TTaggedPayloadReader::TryReadTag()
{
YT_ASSERT(MessageRead_);
if (Current_ == End_) {
return std::nullopt;
}
auto keySize = ReadLength();
bool wellKnown = (keySize & WellKnownTagFlag) != 0;
auto key = ReadBytes(keySize & ~WellKnownTagFlag);
auto value = ReadString();
return TTag{.IsWellKnown = wellKnown, .Key = key, .Value = value};
}
ui32 TTaggedPayloadReader::ReadLength()
{
YT_ASSERT(Current_ + sizeof(ui32) <= End_);
ui32 size;
::memcpy(&size, Current_, sizeof(size));
Current_ += sizeof(size);
return size;
}
TStringBuf TTaggedPayloadReader::ReadBytes(ui32 size)
{
YT_ASSERT(Current_ + size <= End_);
TStringBuf result(Current_, size);
Current_ += size;
return result;
}
TStringBuf TTaggedPayloadReader::ReadString()
{
return ReadBytes(ReadLength());
}
////////////////////////////////////////////////////////////////////////////////
TTaggedLogEventPayload MakeTaggedPayloadFromMessage(TStringBuf message)
{
TTaggedPayloadWriter writer;
writer.BeginMessage()->AppendString(message);
writer.EndMessage();
return writer.Finish();
}
TStringBuf GetMessageFromTaggedPayload(const TTaggedLogEventPayload& payload)
{
return TTaggedPayloadReader(payload).ReadMessage();
}
std::string FormatTaggedPayload(const TTaggedLogEventPayload& payload)
{
TTaggedPayloadReader reader(payload);
std::string result(reader.ReadMessage());
// Well-known tags (e.g. an error) are always written last -- the fluent |.With| chain
// enforces this at the type level (see #TWellKnownTaggedLoggingGuard) -- so they render
// after the |(...)| group on trailing lines in a single pass.
bool parenOpen = false;
while (auto tag = reader.TryReadTag()) {
if (tag->IsWellKnown) {
if (parenOpen) {
result += ')';
parenOpen = false;
}
result += '\n';
result += tag->Value;
} else {
result += parenOpen ? ", " : " (";
parenOpen = true;
result += tag->Key;
result += ": ";
result += tag->Value;
}
}
if (parenOpen) {
result += ')';
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NLogging
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