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22 lines
589 B
Go
22 lines
589 B
Go
package middleware
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import (
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"net/http"
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"go.opentelemetry.io/otel/propagation"
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)
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var propagator = propagation.NewCompositeTextMapPropagator(
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propagation.Baggage{},
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propagation.TraceContext{},
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)
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// TraceContext unpacks the request context looking for an existing trace id.
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func TraceContext(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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ctx := propagator.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
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propagator.Inject(ctx, propagation.HeaderCarrier(r.Header))
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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