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Implement HTTP resend spec for Reactor Netty (excl CONNECT spans) #8111

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mateuszrzeszutek
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Part of #5722

Similar to #7652, it implements the resend spec in Reactor Netty. This PR does not include the connection error span implementation, since that requires some changes in the Netty instrumentation as well. It does prepare the code for the connection error changes though -- I'll just add them in a separate PR (based on this one) to make things easier to read.

@mateuszrzeszutek mateuszrzeszutek requested a review from a team March 22, 2023 15:17
Comment on lines +117 to 126
if (HttpClientResend.get(instrumentationContexts.getParentContext()) == 0) {
// TODO: emit connection error span

// FIXME: this branch requires lots of changes around the NettyConnectionInstrumenter
// currently it also creates that connection error span (when the connection telemetry is
// turned off), but without HTTP semantics - it does not have access to any HTTP information
// after all
// it should be possible to completely disable it, and just start and end the span here
// this requires lots of refactoring and pretty uninteresting changes in the netty code, so
// I'll do that in a separate PR - for better readability
}
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Here's where the connection span will be added -- similar to the ConnectionErrorSpanInterceptor in the OkHttp instrumentation, it's only emitted on error and when there were no HTTP requests made.

@mateuszrzeszutek mateuszrzeszutek marked this pull request as draft March 23, 2023 10:37
@mateuszrzeszutek mateuszrzeszutek force-pushed the reactor-netty-resend-poc branch from 02a4d2c to 51014a1 Compare May 18, 2023 13:46
@mateuszrzeszutek mateuszrzeszutek marked this pull request as ready for review May 18, 2023 13:47
@mateuszrzeszutek mateuszrzeszutek force-pushed the reactor-netty-resend-poc branch from dd82a2e to d1ff9c6 Compare July 14, 2023 10:20
@mateuszrzeszutek
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@open-telemetry/java-instrumentation-approvers please review this PR 🙏

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@breedx-splk breedx-splk left a comment

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Looks good to me. A few small nits, otherwise looking good. Not having the error span in there makes the state a little weird, but I definitely prefer this incremental work. 👍🏻

@@ -78,6 +78,12 @@ public final void waitAndAssertSortedTraces(
waitAndAssertTraces(traceComparator, Arrays.asList(assertions), true);
}

public final void waitAndAssertSortedTraces(
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😎

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@trask trask left a comment

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nice

Comment on lines +114 to +116
equalTo(SemanticAttributes.USER_AGENT_ORIGINAL, USER_AGENT),
equalTo(SemanticAttributes.HTTP_STATUS_CODE, 200),
equalTo(SemanticAttributes.HTTP_REQUEST_CONTENT_LENGTH, 0),
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nice

Comment on lines +112 to +114
// TODO: remove this test altogether? this scenario is (was) only implemented in reactor-netty,
// all other HTTP clients worked in a different way
// optionsBuilder.enableTestCallbackWithImplicitParent();
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👍

Comment on lines +18 to +19
public String getUrlFull(HttpClientRequest request) {
return request.resourceUrl();
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so much better 😅

@trask trask force-pushed the reactor-netty-resend-poc branch from 54e6780 to 70be753 Compare July 20, 2023 02:47
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3 participants