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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package baggagecopy // import "go.opentelemetry.io/contrib/processors/baggagecopy"
import (
"context"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/sdk/trace"
)
// Filter returns true if the baggage member should be added to a span.
type Filter func(member baggage.Member) bool
// AllowAllMembers allows all baggage members to be added to a span.
var AllowAllMembers Filter = func(baggage.Member) bool { return true }
// SpanProcessor is a [trace.SpanProcessor] implementation that adds baggage
// members onto a span as attributes.
type SpanProcessor struct {
filter Filter
}
var _ trace.SpanProcessor = (*SpanProcessor)(nil)
// NewSpanProcessor returns a new [SpanProcessor].
//
// The Baggage span processor duplicates onto a span the attributes found
// in Baggage in the parent context at the moment the span is started.
// The passed filter determines which baggage members are added to the span.
//
// If filter is nil, all baggage members will be added.
func NewSpanProcessor(filter Filter) *SpanProcessor {
return &SpanProcessor{
filter: filter,
}
}
// OnStart is called when a span is started and adds span attributes for baggage contents.
func (processor SpanProcessor) OnStart(ctx context.Context, span trace.ReadWriteSpan) {
filter := processor.filter
if filter == nil {
filter = AllowAllMembers
}
for _, member := range baggage.FromContext(ctx).Members() {
if filter(member) {
span.SetAttributes(attribute.String(member.Key(), member.Value()))
}
}
}
// OnEnd is called when span is finished and is a no-op for this processor.
func (processor SpanProcessor) OnEnd(s trace.ReadOnlySpan) {}
// Shutdown is called when the SDK shuts down and is a no-op for this processor.
func (processor SpanProcessor) Shutdown(context.Context) error { return nil }
// ForceFlush exports all ended spans to the configured Exporter that have not yet
// been exported and is a no-op for this processor.
func (processor SpanProcessor) ForceFlush(context.Context) error { return nil }
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