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traceid.go
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traceid.go
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package trace
import (
"context"
"fmt"
"math/rand"
"sync"
"time"
"github.com/opentracing/opentracing-go"
"github.com/uber/jaeger-client-go"
"github.com/uber/jaeger-client-go/utils"
)
const KeyName = "traceId"
var randomNumber func() uint64
func init() {
seedGenerator := utils.NewRand(time.Now().UnixNano())
pool := sync.Pool{
New: func() interface{} {
return rand.NewSource(seedGenerator.Int63())
},
}
randomNumber = func() uint64 {
generator := pool.Get().(rand.Source)
number := uint64(generator.Int63())
pool.Put(generator)
return number
}
}
// TraceId represents unique 128bit identifier of a trace
type TraceId struct {
High, Low uint64
}
func NewTraceId() string {
return TraceId{High: randomNumber(), Low: randomNumber()}.String()
}
func (t TraceId) String() string {
if t.High == 0 {
return fmt.Sprintf("%x", t.Low)
}
return fmt.Sprintf("%x%016x", t.High, t.Low)
}
// IsValid checks if the TraceId is valid, i.e. not zero.
func (t TraceId) IsValid() bool {
return t.High != 0 || t.Low != 0
}
//TraceIdFromContext 从context中获取TraceId
func TraceIdFromContext(ctx context.Context) (traceId string) {
span := opentracing.SpanFromContext(ctx)
if span != nil {
if spanContext, ok := span.Context().(jaeger.SpanContext); ok {
return spanContext.TraceID().String()
}
}
return ""
}
func NewCtxWithTraceId(ctx context.Context) context.Context {
traceId := TraceIdFromContext(ctx)
if traceId != "" {
return ctx
}
_, ctx = opentracing.StartSpanFromContext(ctx, "NewCtxWithTraceId")
return ctx
}