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trace_id.h
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trace_id.h
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// Copyright 2017, OpenCensus 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.
#ifndef OPENCENSUS_TRACE_TRACE_ID_H_
#define OPENCENSUS_TRACE_TRACE_ID_H_
#include <cstdint>
#include <string>
namespace opencensus {
namespace trace {
// TraceId represents an opaque 128-bit trace identifier. The trace identifier
// remains constant across the trace. TraceId is immutable.
class TraceId final {
public:
// The size in bytes of the TraceId.
static constexpr size_t kSize = 16;
// An invalid TraceId (all zeros).
TraceId() : rep_{0} {}
// Creates a TraceId by copying the first kSize bytes from the buffer.
explicit TraceId(const uint8_t* buf);
// Returns a 32-char hex string of the TraceId value.
std::string ToHex() const;
// Returns a pointer to the opaque value.
const void* Value() const;
bool operator==(const TraceId& that) const;
// Returns false if the TraceId is all zeros.
bool IsValid() const;
// Copies the opaque TraceId data to a buffer, which must hold kSize bytes.
void CopyTo(uint8_t* buf) const;
private:
uint8_t rep_[kSize];
};
} // namespace trace
} // namespace opencensus
#endif // OPENCENSUS_TRACE_TRACE_ID_H_