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#include "iterator.h"
#include <library/cpp/streams/growing_file_input/growing_file_input.h>
#include <util/string/cast.h>
#include <util/string/split.h>
#include <util/string/type.h>
#include <util/stream/file.h>
using namespace NEventLog;
namespace {
inline TIntrusivePtr<TEventFilter> ConstructEventFilter(bool enableEvents, const TString& evList, IEventFactory* fac) {
if (evList.empty()) {
return nullptr;
}
TVector<TString> events;
StringSplitter(evList).Split(',').SkipEmpty().Collect(&events);
if (events.empty()) {
return nullptr;
}
TIntrusivePtr<TEventFilter> filter(new TEventFilter(enableEvents));
for (const auto& event : events) {
if (IsNumber(event))
filter->AddEventClass(FromString<size_t>(event));
else
filter->AddEventClass(fac->ClassByName(event));
}
return filter;
}
struct TIterator: public IIterator {
inline TIterator(const TOptions& o, IEventFactory* fac)
: First(true)
{
if (o.FileName.size()) {
if (o.ForceStreamMode || o.TailFMode) {
FileInput.Reset(o.TailFMode ? (IInputStream*)new TGrowingFileInput(o.FileName) : (IInputStream*)new TUnbufferedFileInput(o.FileName));
FrameStream.Reset(new TFrameStreamer(*FileInput, fac, o.FrameFilter));
} else {
FrameStream.Reset(new TFrameStreamer(o.FileName, o.StartTime, o.EndTime, o.MaxRequestDuration, fac, o.FrameFilter));
}
} else {
FrameStream.Reset(new TFrameStreamer(*o.Input, fac, o.FrameFilter));
}
EvFilter = ConstructEventFilter(o.EnableEvents, o.EvList, fac);
EventStream.Reset(new TEventStreamer(*FrameStream, o.StartTime, o.EndTime, o.ForceStrongOrdering, EvFilter, o.ForceLosslessStrongOrdering));
}
TConstEventPtr Next() override {
if (First) {
First = false;
if (!EventStream->Avail()) {
return nullptr;
}
} else {
if (!EventStream->Next()) {
return nullptr;
}
}
return **EventStream;
}
THolder<IInputStream> FileInput;
THolder<TFrameStreamer> FrameStream;
TIntrusivePtr<TEventFilter> EvFilter;
THolder<TEventStreamer> EventStream;
bool First;
};
}
IIterator::~IIterator() = default;
THolder<IIterator> NEventLog::CreateIterator(const TOptions& o, IEventFactory* fac) {
return MakeHolder<TIterator>(o, fac);
}
THolder<IIterator> NEventLog::CreateIterator(const TOptions& o) {
return MakeHolder<TIterator>(o, NEvClass::Factory());
}
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