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#pragma once
#include <library/cpp/string_utils/base64/base64.h>
#include <util/stream/output.h>
#include <util/random/random.h>
#include <util/random/fast.h>
#include <util/string/printf.h>
#include <array>
namespace NWilson {
class TTraceId {
using TTrace = std::array<ui64, 2>;
TTrace TraceId; // Random id of topmost client request
ui64 SpanId;
union {
struct {
ui32 Verbosity : 4;
ui32 TimeToLive : 12;
};
ui32 Raw;
};
private:
TTraceId(TTrace traceId, ui64 spanId, ui8 verbosity, ui32 timeToLive)
: TraceId(traceId)
{
SpanId = spanId;
Verbosity = verbosity;
TimeToLive = timeToLive;
}
static TTrace GenerateTraceId() {
for (;;) {
TTrace res;
ui32 *p = reinterpret_cast<ui32*>(res.data());
TReallyFastRng32 rng(RandomNumber<ui64>());
p[0] = rng();
p[1] = rng();
p[2] = rng();
p[3] = rng();
if (res[0] || res[1]) {
return res;
}
}
}
static ui64 GenerateSpanId() {
for (;;) {
if (const ui64 res = RandomNumber<ui64>(); res) { // SpanId can't be zero
return res;
}
}
}
public:
using TSerializedTraceId = char[sizeof(TTrace) + sizeof(ui64) + sizeof(ui32)];
public:
TTraceId(ui64) // NBS stub
: TTraceId()
{}
TTraceId() {
TraceId.fill(0);
SpanId = 0;
Raw = 0;
}
explicit TTraceId(TTrace traceId)
: TraceId(traceId)
{
SpanId = 0;
Raw = 0;
}
// allow move semantic
TTraceId(TTraceId&& other)
: TraceId(other.TraceId)
, SpanId(other.SpanId)
, Raw(other.Raw)
{
other.TraceId.fill(0);
other.SpanId = 0;
other.Raw = 0;
}
// explicit copy
explicit TTraceId(const TTraceId& other)
: TraceId(other.TraceId)
, SpanId(other.SpanId)
, Raw(other.Raw)
{}
TTraceId(const TSerializedTraceId& in) {
const char *p = in;
memcpy(TraceId.data(), p, sizeof(TraceId));
p += sizeof(TraceId);
memcpy(&SpanId, p, sizeof(SpanId));
p += sizeof(SpanId);
memcpy(&Raw, p, sizeof(Raw));
p += sizeof(Raw);
Y_VERIFY_DEBUG(p - in == sizeof(TSerializedTraceId));
}
void Serialize(TSerializedTraceId *out) const {
char *p = *out;
memcpy(p, TraceId.data(), sizeof(TraceId));
p += sizeof(TraceId);
memcpy(p, &SpanId, sizeof(SpanId));
p += sizeof(SpanId);
memcpy(p, &Raw, sizeof(Raw));
p += sizeof(Raw);
Y_VERIFY_DEBUG(p - *out == sizeof(TSerializedTraceId));
}
TTraceId& operator=(TTraceId&& other) {
if (this != &other) {
TraceId = other.TraceId;
SpanId = other.SpanId;
Raw = other.Raw;
other.TraceId.fill(0);
other.SpanId = 0;
other.Raw = 0;
}
return *this;
}
// do not allow implicit copy of trace id
TTraceId& operator=(const TTraceId& other) = delete;
static TTraceId NewTraceId(ui8 verbosity, ui32 timeToLive) {
return TTraceId(GenerateTraceId(), 0, verbosity, timeToLive);
}
static TTraceId NewTraceId() { // NBS stub
return TTraceId();
}
TTraceId Span(ui8 verbosity) const {
return *this && TimeToLive && verbosity <= Verbosity
? TTraceId(TraceId, GenerateSpanId(), Verbosity, TimeToLive - 1)
: TTraceId();
}
TTraceId Span() const { // compatibility stub
return {};
}
// Check if request tracing is enabled
explicit operator bool() const {
return TraceId[0] || TraceId[1];
}
bool IsRoot() const {
return !SpanId;
}
friend bool operator==(const TTraceId& x, const TTraceId& y) {
return x.TraceId == y.TraceId && x.SpanId == y.SpanId && x.Raw == y.Raw;
}
ui8 GetVerbosity() const {
return Verbosity;
}
const void *GetTraceIdPtr() const { return TraceId.data(); }
static constexpr size_t GetTraceIdSize() { return sizeof(TTrace); }
const void *GetSpanIdPtr() const { return &SpanId; }
static constexpr size_t GetSpanIdSize() { return sizeof(ui64); }
// for compatibility with NBS
TTraceId Clone() const { return NWilson::TTraceId(*this); }
ui64 GetTraceId() const { return 0; }
void OutputSpanId(IOutputStream&) const {}
};
}
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