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43 lines
1.1 KiB
43 lines
1.1 KiB
package tracing
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import (
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"context"
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"github.com/go-kratos/kratos/v2"
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"github.com/go-kratos/kratos/v2/metadata"
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"go.opentelemetry.io/otel/propagation"
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)
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const serviceHeader = "x-md-service-name"
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// Metadata is tracing metadata propagator
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type Metadata struct{}
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var _ propagation.TextMapPropagator = Metadata{}
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// Inject sets metadata key-values from ctx into the carrier.
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func (b Metadata) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {
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app, _ := kratos.FromContext(ctx)
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carrier.Set(serviceHeader, app.Name())
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}
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// Extract returns a copy of parent with the metadata from the carrier added.
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func (b Metadata) Extract(parent context.Context, carrier propagation.TextMapCarrier) context.Context {
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name := carrier.Get(serviceHeader)
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if name != "" {
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if md, ok := metadata.FromServerContext(parent); ok {
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md.Set(serviceHeader, name)
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} else {
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md := metadata.New()
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md.Set(serviceHeader, name)
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parent = metadata.NewServerContext(parent, md)
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}
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}
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return parent
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}
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// Fields returns the keys who's values are set with Inject.
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func (b Metadata) Fields() []string {
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return []string{serviceHeader}
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}
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