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uber-trace-id from incoming request overwrites client span in spring cloud gateway tracing #340

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#341
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uber-trace-id from incoming request overwrites client span in spring cloud gateway tracing#340
#341
@rafis

Description

@rafis
rafis
opened on Jan 23, 2023

Client span is generated here:

java-spring-cloud/instrument-starters/opentracing-spring-cloud-gateway-starter/src/main/java/io/opentracing/contrib/spring/cloud/gateway/TraceRequestHttpHeadersFilter.java

Lines 55 to 60 in 8a865d5

Span span = this.tracer.buildSpan(path(builder))
.asChildOf(tracer.activeSpan())
.withTag(Tags.COMPONENT.getKey(), COMPONENT)
.withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_CLIENT)
.withTag(ROUTE_ID, getRouteId(exchange))
.start();

Next we try to inject this span into Http Headers of inner request:

java-spring-cloud/instrument-starters/opentracing-spring-cloud-gateway-starter/src/main/java/io/opentracing/contrib/spring/cloud/gateway/TraceRequestHttpHeadersFilter.java

Lines 65 to 70 in 8a865d5

this.tracer.inject(span.context(), Format.Builtin.HTTP_HEADERS, new HttpHeadersCarrier(headersWithInput));
} catch (Exception ignore) {
log.error("TraceRequestHttpHeadersFilter error", ignore);
}
headersWithInput.addAll(input);
addHeadersWithInput(builder, headersWithInput);

But if the incoming request to Spring Cloud Gateway had it own uber-trace-id header this will overwrite what we just tried to do. Is it a bug?

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