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Create spans for multiple subscriptions to traced Reactor publisher
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113 changes: 113 additions & 0 deletions
113
.../library/src/main/java/io/opentelemetry/instrumentation/reactor/InstrumentedOperator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * Copyright The OpenTelemetry Authors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
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| package io.opentelemetry.instrumentation.reactor; | ||
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|
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| import io.opentelemetry.context.Context; | ||
| import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import java.util.function.BiFunction; | ||
| import java.util.function.Function; | ||
| import org.reactivestreams.Publisher; | ||
| import reactor.core.CoreSubscriber; | ||
| import reactor.core.Scannable; | ||
| import reactor.core.publisher.Flux; | ||
| import reactor.core.publisher.Mono; | ||
| import reactor.core.publisher.Operators; | ||
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|
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| final class InstrumentedOperator<REQUEST, RESPONSE, T> | ||
| implements BiFunction<Scannable, CoreSubscriber<? super T>, CoreSubscriber<? super T>> { | ||
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| private final Instrumenter<REQUEST, RESPONSE> instrumenter; | ||
| private final Context context; | ||
| private final REQUEST request; | ||
| private final Class<RESPONSE> responseType; | ||
| private final boolean captureExperimentalSpanAttributes; | ||
| private final AtomicBoolean firstSubscriber = new AtomicBoolean(true); | ||
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| static <REQUEST, RESPONSE, T> Mono<T> transformMono( | ||
| Mono<T> mono, | ||
| Instrumenter<REQUEST, RESPONSE> instrumenter, | ||
| Context context, | ||
| REQUEST request, | ||
| Class<RESPONSE> responseType, | ||
| boolean captureExperimentalSpanAttributes) { | ||
|
|
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| return mono.transform( | ||
| InstrumentedOperator.<REQUEST, RESPONSE, T>tracingLift( | ||
| instrumenter, context, request, responseType, captureExperimentalSpanAttributes)); | ||
| } | ||
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| static <REQUEST, RESPONSE, T> Flux<T> transformFlux( | ||
| Flux<T> flux, | ||
| Instrumenter<REQUEST, RESPONSE> instrumenter, | ||
| Context context, | ||
| REQUEST request, | ||
| Class<RESPONSE> responseType, | ||
| boolean captureExperimentalSpanAttributes) { | ||
|
|
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| return flux.transform( | ||
| InstrumentedOperator.<REQUEST, RESPONSE, T>tracingLift( | ||
| instrumenter, context, request, responseType, captureExperimentalSpanAttributes)); | ||
| } | ||
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| private static <REQUEST, RESPONSE, T> | ||
| Function<? super Publisher<T>, ? extends Publisher<T>> tracingLift( | ||
| Instrumenter<REQUEST, RESPONSE> instrumenter, | ||
| Context context, | ||
| REQUEST request, | ||
| Class<RESPONSE> responseType, | ||
| boolean captureExperimentalSpanAttributes) { | ||
|
|
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| return Operators.lift( | ||
| new InstrumentedOperator<>( | ||
| instrumenter, context, request, responseType, captureExperimentalSpanAttributes)); | ||
| } | ||
|
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| private InstrumentedOperator( | ||
| Instrumenter<REQUEST, RESPONSE> instrumenter, | ||
| Context context, | ||
| REQUEST request, | ||
| Class<RESPONSE> responseType, | ||
| boolean captureExperimentalSpanAttributes) { | ||
| this.instrumenter = instrumenter; | ||
| this.context = context; | ||
| this.request = request; | ||
| this.responseType = responseType; | ||
| this.captureExperimentalSpanAttributes = captureExperimentalSpanAttributes; | ||
| } | ||
|
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| @Override | ||
| public CoreSubscriber<? super T> apply( | ||
| Scannable scannable, CoreSubscriber<? super T> coreSubscriber) { | ||
|
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| if (isFirstSubscriber()) { | ||
| return new InstrumentedSubscriber<>( | ||
| instrumenter, | ||
| context, | ||
| request, | ||
| responseType, | ||
| captureExperimentalSpanAttributes, | ||
| coreSubscriber); | ||
| } | ||
|
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| Context parentContext = Context.current(); | ||
| if (instrumenter.shouldStart(parentContext, request)) { | ||
| Context context = instrumenter.start(parentContext, request); | ||
| return new InstrumentedSubscriber<>( | ||
| instrumenter, | ||
| context, | ||
| request, | ||
| responseType, | ||
| captureExperimentalSpanAttributes, | ||
| coreSubscriber); | ||
| } | ||
| return coreSubscriber; | ||
| } | ||
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| private boolean isFirstSubscriber() { | ||
| return firstSubscriber.compareAndSet(true, false); | ||
| } | ||
| } |
97 changes: 97 additions & 0 deletions
97
...ibrary/src/main/java/io/opentelemetry/instrumentation/reactor/InstrumentedSubscriber.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| /* | ||
| * Copyright The OpenTelemetry Authors | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| */ | ||
|
|
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| package io.opentelemetry.instrumentation.reactor; | ||
|
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| import static io.opentelemetry.instrumentation.api.annotation.support.async.AsyncOperationEndSupport.tryToGetResponse; | ||
|
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| import io.opentelemetry.api.common.AttributeKey; | ||
| import io.opentelemetry.api.trace.Span; | ||
| import io.opentelemetry.context.Context; | ||
| import io.opentelemetry.instrumentation.api.instrumenter.Instrumenter; | ||
| import org.reactivestreams.Subscription; | ||
| import reactor.core.CoreSubscriber; | ||
| import reactor.core.publisher.Operators; | ||
|
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| final class InstrumentedSubscriber<REQUEST, RESPONSE, T> | ||
| implements CoreSubscriber<T>, Subscription { | ||
|
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| private static final AttributeKey<Boolean> CANCELED_ATTRIBUTE_KEY = | ||
| AttributeKey.booleanKey("reactor.canceled"); | ||
|
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| private final Instrumenter<REQUEST, RESPONSE> instrumenter; | ||
| private final Context context; | ||
| private final REQUEST request; | ||
| private final Class<RESPONSE> responseType; | ||
| private final boolean captureExperimentalSpanAttributes; | ||
| private final CoreSubscriber<T> actual; | ||
| private Subscription subscription; | ||
| private T value; | ||
|
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| InstrumentedSubscriber( | ||
| Instrumenter<REQUEST, RESPONSE> instrumenter, | ||
| Context context, | ||
| REQUEST request, | ||
| Class<RESPONSE> responseType, | ||
| boolean captureExperimentalSpanAttributes, | ||
| CoreSubscriber<T> actual) { | ||
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| this.instrumenter = instrumenter; | ||
| this.context = context; | ||
| this.request = request; | ||
| this.responseType = responseType; | ||
| this.captureExperimentalSpanAttributes = captureExperimentalSpanAttributes; | ||
| this.actual = actual; | ||
| } | ||
|
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| @Override | ||
| public void onSubscribe(Subscription subscription) { | ||
| if (Operators.validate(this.subscription, subscription)) { | ||
| this.subscription = subscription; | ||
| actual.onSubscribe(this); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void request(long count) { | ||
| if (subscription != null) { | ||
| subscription.request(count); | ||
| } | ||
| } | ||
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| @Override | ||
| public void cancel() { | ||
| if (subscription != null) { | ||
| if (captureExperimentalSpanAttributes) { | ||
| Span.fromContext(context).setAttribute(CANCELED_ATTRIBUTE_KEY, true); | ||
| } | ||
| instrumenter.end(context, request, null, null); | ||
| subscription.cancel(); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void onNext(T value) { | ||
| this.value = value; | ||
| actual.onNext(value); | ||
| } | ||
|
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| @Override | ||
| public void onError(Throwable error) { | ||
| instrumenter.end(context, request, null, error); | ||
| actual.onError(error); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| instrumenter.end(context, request, tryToGetResponse(responseType, value), null); | ||
| actual.onComplete(); | ||
| } | ||
|
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| @Override | ||
| public reactor.util.context.Context currentContext() { | ||
| return actual.currentContext(); | ||
| } | ||
| } |
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