79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
// Copyright 2019, OpenTelemetry Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#pragma once
|
|
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
|
|
#include "opentelemetry/nostd/span.h"
|
|
#include "opentelemetry/version.h"
|
|
|
|
OPENTELEMETRY_BEGIN_NAMESPACE
|
|
namespace trace
|
|
{
|
|
|
|
class SpanId final
|
|
{
|
|
public:
|
|
// The size in bytes of the SpanId.
|
|
static constexpr int kSize = 8;
|
|
|
|
// An invalid SpanId (all zeros).
|
|
SpanId() noexcept : rep_{0} {}
|
|
|
|
// Creates a SpanId with the given ID.
|
|
explicit SpanId(nostd::span<const uint8_t, kSize> id) noexcept { memcpy(rep_, id.data(), kSize); }
|
|
|
|
// Populates the buffer with the lowercase base16 representation of the ID.
|
|
void ToLowerBase16(nostd::span<char, 2 * kSize> buffer) const noexcept
|
|
{
|
|
constexpr char kHex[] = "0123456789abcdef";
|
|
for (int i = 0; i < kSize; ++i)
|
|
{
|
|
buffer[i * 2 + 0] = kHex[(rep_[i] >> 4) & 0xF];
|
|
buffer[i * 2 + 1] = kHex[(rep_[i] >> 0) & 0xF];
|
|
}
|
|
}
|
|
|
|
// Returns a nostd::span of the ID.
|
|
nostd::span<const uint8_t, kSize> Id() const noexcept
|
|
{
|
|
return nostd::span<const uint8_t, kSize>(rep_);
|
|
}
|
|
|
|
bool operator==(const SpanId &that) const noexcept { return memcmp(rep_, that.rep_, kSize) == 0; }
|
|
|
|
bool operator!=(const SpanId &that) const noexcept { return !(*this == that); }
|
|
|
|
// Returns false if the SpanId is all zeros.
|
|
bool IsValid() const noexcept
|
|
{
|
|
static constexpr uint8_t kEmptyRep[kSize] = {0};
|
|
return memcmp(rep_, kEmptyRep, kSize) != 0;
|
|
}
|
|
|
|
// Copies the opaque SpanId data to dest.
|
|
void CopyBytesTo(nostd::span<uint8_t, kSize> dest) const noexcept
|
|
{
|
|
memcpy(dest.data(), rep_, kSize);
|
|
}
|
|
|
|
private:
|
|
uint8_t rep_[kSize];
|
|
};
|
|
|
|
} // namespace trace
|
|
OPENTELEMETRY_END_NAMESPACE
|