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#pragma once
#include "private.h"
#include <yt/yt/library/syncmap/map.h>
#include <yt/yt/core/ytree/yson_struct.h>
#include <library/cpp/yt/memory/atomic_intrusive_ptr.h>
namespace NYT::NTracing {
////////////////////////////////////////////////////////////////////////////////
struct TSamplerConfig
: public NYTree::TYsonStruct
{
//! Request is sampled with probability P.
double GlobalSampleRate;
//! Additionally, request is sampled with probability P(user).
THashMap<TString, double> UserSampleRate;
//! Spans are sent to specified endpoint.
THashMap<TString, TString> UserEndpoint;
//! Additionally, sample first N requests for each user in the window.
ui64 MinPerUserSamples;
TDuration MinPerUserSamplesPeriod;
//! Clear sampled from from incoming user request.
THashMap<TString, bool> ClearSampledFlag;
REGISTER_YSON_STRUCT(TSamplerConfig);
static void Register(TRegistrar registrar);
};
DEFINE_REFCOUNTED_TYPE(TSamplerConfig)
////////////////////////////////////////////////////////////////////////////////
class TSampler
: public TRefCounted
{
public:
explicit TSampler(
TSamplerConfigPtr config = New<TSamplerConfig>(),
const NProfiling::TProfiler& profiler = TracingProfiler());
void SampleTraceContext(const std::string& user, const TTraceContextPtr& traceContext);
void UpdateConfig(TSamplerConfigPtr config);
private:
TAtomicIntrusivePtr<TSamplerConfig> Config_;
NProfiling::TProfiler Profiler_;
struct TUserState final
{
std::atomic<ui64> Sampled = {0};
std::atomic<NProfiling::TCpuInstant> LastReset = {0};
bool TrySampleByMinCount(ui64 minCount, NProfiling::TCpuDuration period);
NProfiling::TCounter TracesSampledByUser;
NProfiling::TCounter TracesSampledByProbability;
};
NConcurrency::TSyncMap<TString, TIntrusivePtr<TUserState>> Users_;
NProfiling::TCounter TracesSampled_;
};
DEFINE_REFCOUNTED_TYPE(TSampler)
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NTracing
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