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baggage_span_processor.go
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baggage_span_processor.go
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// Copyright Honeycomb 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 honeycomb
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/sdk/trace"
)
type baggageSpanProcessor struct{}
var _ trace.SpanProcessor = (*baggageSpanProcessor)(nil)
// Returns a new baggageSpanProcessor.
//
// The Baggage span processor duplicates onto a span the attributes found
// in Baggage in the parent context at the moment the span is started.
func NewBaggageSpanProcessor() trace.SpanProcessor {
return &baggageSpanProcessor{}
}
func (processor baggageSpanProcessor) OnStart(ctx context.Context, span trace.ReadWriteSpan) {
baggage := baggage.FromContext(ctx)
for _, entry := range baggage.Members() {
span.SetAttributes(attribute.String(entry.Key(), entry.Value()))
}
}
func (processor baggageSpanProcessor) OnEnd(s trace.ReadOnlySpan) {}
func (processor baggageSpanProcessor) Shutdown(context.Context) error { return nil }
func (processor baggageSpanProcessor) ForceFlush(context.Context) error { return nil }