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opentelemetry-go/api/core/span_context.go

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// 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.
package core
import (
"fmt"
)
type TraceID struct {
High uint64
Low uint64
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}
const (
traceOptionBitMaskSampled = byte(0x01)
traceOptionBitMaskUnused = byte(0xFE)
// TraceOptionSampled is a byte with sampled bit set. It is a convenient value initialize
// SpanContext when a trace is sampled.
TraceOptionSampled = traceOptionBitMaskSampled
)
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type SpanContext struct {
TraceID TraceID
SpanID uint64
TraceOptions byte
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}
var (
// INVALID_SPAN_CONTEXT is meant for internal use to return invalid span context during error
// conditions.
INVALID_SPAN_CONTEXT = SpanContext{}
)
func (sc SpanContext) IsValid() bool {
return sc.HasTraceID() && sc.HasSpanID()
}
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func (sc SpanContext) HasTraceID() bool {
return sc.TraceID.High != 0 || sc.TraceID.Low != 0
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}
func (sc SpanContext) HasSpanID() bool {
return sc.SpanID != 0
}
func (sc SpanContext) SpanIDString() string {
return fmt.Sprintf("%.16x", sc.SpanID)
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}
func (sc SpanContext) TraceIDString() string {
p1 := fmt.Sprintf("%.16x", sc.TraceID.High)
p2 := fmt.Sprintf("%.16x", sc.TraceID.Low)
return p1 + p2
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}
func (sc SpanContext) IsSampled() bool {
return sc.TraceOptions&traceOptionBitMaskSampled == traceOptionBitMaskSampled
}