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#include "rotating_file.h"
#include "file.h"
#include "record.h"
#include <util/string/builder.h>
#include <util/system/fstat.h>
#include <util/system/rwlock.h>
#include <util/system/fs.h>
#include <util/system/atomic.h>
#include <util/generic/string.h>
/*
* rotating file log
* if Size_ > MaxSizeBytes
* Path.(N-1) -> Path.N
* Path.(N-2) -> Path.(N-1)
* ...
* Path.1 -> Path.2
* Path -> Path.1
*/
class TRotatingFileLogBackend::TImpl {
public:
inline TImpl(const TString& path, const ui64 maxSizeBytes, const ui32 rotatedFilesCount)
: Log_(path)
, Path_(path)
, MaxSizeBytes_(maxSizeBytes)
, Size_(TFileStat(Path_).Size)
, RotatedFilesCount_(rotatedFilesCount)
{
Y_ENSURE(RotatedFilesCount_ != 0);
}
inline void WriteData(const TLogRecord& rec) {
if (static_cast<ui64>(AtomicGet(Size_)) > MaxSizeBytes_) {
TWriteGuard guard(Lock_);
if (static_cast<ui64>(AtomicGet(Size_)) > MaxSizeBytes_) {
TString newLogPath(TStringBuilder{} << Path_ << "." << RotatedFilesCount_);
for (size_t fileId = RotatedFilesCount_ - 1; fileId; --fileId) {
TString oldLogPath(TStringBuilder{} << Path_ << "." << fileId);
NFs::Rename(oldLogPath, newLogPath);
newLogPath = oldLogPath;
}
NFs::Rename(Path_, newLogPath);
Log_.ReopenLog();
AtomicSet(Size_, 0);
}
}
TReadGuard guard(Lock_);
Log_.WriteData(rec);
AtomicAdd(Size_, rec.Len);
}
inline void ReopenLog() {
TWriteGuard guard(Lock_);
Log_.ReopenLog();
AtomicSet(Size_, TFileStat(Path_).Size);
}
private:
TRWMutex Lock_;
TFileLogBackend Log_;
const TString Path_;
const ui64 MaxSizeBytes_;
TAtomic Size_;
const ui32 RotatedFilesCount_;
};
TRotatingFileLogBackend::TRotatingFileLogBackend(const TString& path, const ui64 maxSizeByte, const ui32 rotatedFilesCount)
: Impl_(new TImpl(path, maxSizeByte, rotatedFilesCount))
{
}
TRotatingFileLogBackend::~TRotatingFileLogBackend() {
}
void TRotatingFileLogBackend::WriteData(const TLogRecord& rec) {
Impl_->WriteData(rec);
}
void TRotatingFileLogBackend::ReopenLog() {
TAtomicSharedPtr<TImpl> copy = Impl_;
if (copy) {
copy->ReopenLog();
}
}
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