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Improve recording of cancellation signal in WebClient

Browse Source 
With its initial fix in gh-18444, the `WebClient` instrumentation would
record all CANCEL signals, including:

* when a `timeout` expires and the response has not been received
* when the client partially consumes the response body

Since the second use case is arguable intentional, this commit restricts
the instrumentation and thus avoids recording two events for a single
request in that case.

Closes gh-18444
This commit is contained in:
Brian Clozel 2020-04-11 21:44:49 +02:00
parent 73ca703007
commit ce653059c8
2 changed files with 23 additions and 1 deletions
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5
spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/reactive/client/MetricsWebClientFilterFunction.java
View File

@ -17,6 +17,7 @@
package org.springframework.boot.actuate.metrics.web.reactive.client;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
@ -77,13 +78,15 @@ public class MetricsWebClientFilterFunction implements ExchangeFilterFunction {
}
private Mono<ClientResponse> instrumentResponse(ClientRequest request, Mono<ClientResponse> responseMono) {
final AtomicBoolean responseReceived = new AtomicBoolean();
return Mono.deferWithContext((ctx) -> responseMono.doOnEach((signal) -> {
if (signal.isOnNext() || signal.isOnError()) {
responseReceived.set(true);
Iterable<Tag> tags = this.tagProvider.tags(request, signal.get(), signal.getThrowable());
recordTimer(tags, getStartTime(ctx));
}
}).doFinally((signalType) -> {
if (SignalType.CANCEL.equals(signalType)) {
if (!responseReceived.get() && SignalType.CANCEL.equals(signalType)) {
Iterable<Tag> tags = this.tagProvider.tags(request, null, null);
recordTimer(tags, getStartTime(ctx));
}

19
spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/client/MetricsWebClientFilterFunctionTests.java
View File

@ -24,6 +24,7 @@ import java.util.concurrent.TimeUnit;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.MockClock;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.search.MeterNotFoundException;
import io.micrometer.core.instrument.simple.SimpleConfig;
import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
import org.junit.jupiter.api.BeforeEach;
@ -40,6 +41,7 @@ import org.springframework.web.reactive.function.client.ExchangeFunction;
import org.springframework.web.reactive.function.client.WebClient;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.mockito.BDDMockito.given;
import static org.mockito.Mockito.mock;
@ -124,6 +126,23 @@ class MetricsWebClientFilterFunctionTests {
assertThat(this.registry.get("http.client.requests")
.tags("method", "GET", "uri", "/projects/spring-boot", "status", "CLIENT_ERROR").timer().count())
.isEqualTo(1);
assertThatThrownBy(() -> this.registry.get("http.client.requests")
.tags("method", "GET", "uri", "/projects/spring-boot", "status", "200").timer())
.isInstanceOf(MeterNotFoundException.class);
}
@Test
void filterWhenCancelAfterResponseThrownShouldNotRecordTimer() {
ClientRequest request = ClientRequest
.create(HttpMethod.GET, URI.create("https://example.com/projects/spring-boot")).build();
given(this.response.rawStatusCode()).willReturn(HttpStatus.OK.value());
Mono<ClientResponse> filter = this.filterFunction.filter(request, this.exchange);
StepVerifier.create(filter).expectNextCount(1).thenCancel().verify(Duration.ofSeconds(5));
assertThat(this.registry.get("http.client.requests")
.tags("method", "GET", "uri", "/projects/spring-boot", "status", "200").timer().count()).isEqualTo(1);
assertThatThrownBy(() -> this.registry.get("http.client.requests")
.tags("method", "GET", "uri", "/projects/spring-boot", "status", "CLIENT_ERROR").timer())
.isInstanceOf(MeterNotFoundException.class);
}
@Test