77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"context"
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crand "crypto/rand"
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"encoding/binary"
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"math/rand"
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"sync"
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"go.opentelemetry.io/otel/trace"
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)
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// IDGenerator allows custom generators for TraceID and SpanID.
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type IDGenerator interface {
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// NewIDs returns a new trace and span ID.
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NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID)
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// NewSpanID returns a ID for a new span in the trace with traceID.
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NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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}
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type randomIDGenerator struct {
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sync.Mutex
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randSource *rand.Rand
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}
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var _ IDGenerator = &randomIDGenerator{}
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// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
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func (gen *randomIDGenerator) NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID {
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gen.Lock()
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defer gen.Unlock()
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sid := trace.SpanID{}
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_, _ = gen.randSource.Read(sid[:])
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return sid
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}
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// NewIDs returns a non-zero trace ID and a non-zero span ID from a
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// randomly-chosen sequence.
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func (gen *randomIDGenerator) NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID) {
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gen.Lock()
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defer gen.Unlock()
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tid := trace.TraceID{}
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_, _ = gen.randSource.Read(tid[:])
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sid := trace.SpanID{}
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_, _ = gen.randSource.Read(sid[:])
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return tid, sid
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}
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func defaultIDGenerator() IDGenerator {
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gen := &randomIDGenerator{}
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var rngSeed int64
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_ = binary.Read(crand.Reader, binary.LittleEndian, &rngSeed)
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gen.randSource = rand.New(rand.NewSource(rngSeed))
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return gen
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}
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