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opentelemetry-go/sdk/trace/id_generator.go

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// Copyright The 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 trace // import "go.opentelemetry.io/otel/sdk/trace"
import (
"context"
crand "crypto/rand"
"encoding/binary"
"math/rand"
"sync"
"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 {
sync.Mutex
randSource *rand.Rand
}
var _ IDGenerator = &randomIDGenerator{}
// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
func (gen *randomIDGenerator) NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID {
gen.Lock()
defer gen.Unlock()
sid := trace.SpanID{}
_, _ = gen.randSource.Read(sid[:])
return sid
}
// NewIDs returns a non-zero trace ID and a non-zero span ID from a
// randomly-chosen sequence.
func (gen *randomIDGenerator) NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID) {
gen.Lock()
defer gen.Unlock()
tid := trace.TraceID{}
_, _ = gen.randSource.Read(tid[:])
sid := trace.SpanID{}
_, _ = gen.randSource.Read(sid[:])
return tid, sid
}
func defaultIDGenerator() IDGenerator {
gen := &randomIDGenerator{}
var rngSeed int64
_ = binary.Read(crand.Reader, binary.LittleEndian, &rngSeed)
gen.randSource = rand.New(rand.NewSource(rngSeed))
return gen
}