44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
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// Copyright 2018, OpenCensus 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
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import (
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"context"
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"encoding/hex"
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"go.opencensus.io/exemplar"
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)
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func init() {
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exemplar.RegisterAttachmentExtractor(attachSpanContext)
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}
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func attachSpanContext(ctx context.Context, a exemplar.Attachments) exemplar.Attachments {
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span := FromContext(ctx)
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if span == nil {
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return a
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}
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sc := span.SpanContext()
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if !sc.IsSampled() {
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return a
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}
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if a == nil {
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a = make(exemplar.Attachments)
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}
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a[exemplar.KeyTraceID] = hex.EncodeToString(sc.TraceID[:])
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a[exemplar.KeySpanID] = hex.EncodeToString(sc.SpanID[:])
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return a
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}
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