Function GetParentSpanForRequest

pkg/util/httpgrpcutil/carrier.go:29–40

(tracer opentracing.Tracer, req *httpgrpc.HTTPRequest)

}

func GetParentSpanForRequest(tracer opentracing.Tracer, req *httpgrpc.HTTPRequest) (opentracing.SpanContext, error) {
	if tracer == nil {
		return nil, nil
	}

	carrier := (*HttpgrpcHeadersCarrier)(req)
	extracted, err := tracer.Extract(opentracing.HTTPHeaders, carrier)
	if err == opentracing.ErrSpanContextNotFound {
		err = nil
	}
	return extracted, err
}