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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package trace // import "go.opentelemetry.io/otel/sdk/trace"
import (
"context"
"encoding/binary"
"math/rand/v2"
"go.opentelemetry.io/otel/trace"
)
// IDGenerator allows custom generators for TraceID and SpanID.
type IDGenerator interface {
// DO NOT CHANGE: any modification will not be backwards compatible and
// must never be done outside of a new major release.
// NewIDs returns a new trace and span ID.
NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID)
// DO NOT CHANGE: any modification will not be backwards compatible and
// must never be done outside of a new major release.
// NewSpanID returns a ID for a new span in the trace with traceID.
NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID
// DO NOT CHANGE: any modification will not be backwards compatible and
// must never be done outside of a new major release.
}
type randomIDGenerator struct{}
var _ IDGenerator = &randomIDGenerator{}
// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
func (*randomIDGenerator) NewSpanID(context.Context, trace.TraceID) trace.SpanID {
sid := trace.SpanID{}
for {
binary.NativeEndian.PutUint64(sid[:], rand.Uint64())
if sid.IsValid() {
break
}
}
return sid
}
// NewIDs returns a non-zero trace ID and a non-zero span ID from a
// randomly-chosen sequence.
func (*randomIDGenerator) NewIDs(context.Context) (trace.TraceID, trace.SpanID) {
tid := trace.TraceID{}
sid := trace.SpanID{}
for {
binary.NativeEndian.PutUint64(tid[:8], rand.Uint64())
binary.NativeEndian.PutUint64(tid[8:], rand.Uint64())
if tid.IsValid() {
break
}
}
for {
binary.NativeEndian.PutUint64(sid[:], rand.Uint64())
if sid.IsValid() {
break
}
}
return tid, sid
}
func defaultIDGenerator() IDGenerator {
return &randomIDGenerator{}
}
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