org.springframework.web.filter.reactive.ServerHttpObservationFilter Maven / Gradle / Ivy
/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.filter.reactive;
import java.util.Optional;
import java.util.Set;
import io.micrometer.observation.Observation;
import io.micrometer.observation.ObservationRegistry;
import io.micrometer.observation.contextpropagation.ObservationThreadLocalAccessor;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.observation.DefaultServerRequestObservationConvention;
import org.springframework.http.server.reactive.observation.ServerHttpObservationDocumentation;
import org.springframework.http.server.reactive.observation.ServerRequestObservationContext;
import org.springframework.http.server.reactive.observation.ServerRequestObservationConvention;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
/**
* {@link org.springframework.web.server.WebFilter} that creates {@link Observation observations}
* for HTTP exchanges. This collects information about the execution time and
* information gathered from the {@link ServerRequestObservationContext}.
* Web Frameworks can fetch the current {@link ServerRequestObservationContext context}
* as a {@link #CURRENT_OBSERVATION_CONTEXT_ATTRIBUTE request attribute} and contribute
* additional information to it.
* The configured {@link ServerRequestObservationConvention} will use this context to collect
* {@link io.micrometer.common.KeyValue metadata} and attach it to the observation.
*
* @author Brian Clozel
* @since 6.0
*/
public class ServerHttpObservationFilter implements WebFilter {
/**
* Name of the request attribute holding the {@link ServerRequestObservationContext context} for the current observation.
*/
public static final String CURRENT_OBSERVATION_CONTEXT_ATTRIBUTE = ServerHttpObservationFilter.class.getName() + ".context";
private static final ServerRequestObservationConvention DEFAULT_OBSERVATION_CONVENTION = new DefaultServerRequestObservationConvention();
private static final Set DISCONNECTED_CLIENT_EXCEPTIONS = Set.of("AbortedException",
"ClientAbortException", "EOFException", "EofException");
private final ObservationRegistry observationRegistry;
private final ServerRequestObservationConvention observationConvention;
/**
* Create an {@code HttpRequestsObservationWebFilter} that records observations
* against the given {@link ObservationRegistry}. The default
* {@link DefaultServerRequestObservationConvention convention} will be used.
* @param observationRegistry the registry to use for recording observations
*/
public ServerHttpObservationFilter(ObservationRegistry observationRegistry) {
this(observationRegistry, DEFAULT_OBSERVATION_CONVENTION);
}
/**
* Create an {@code HttpRequestsObservationWebFilter} that records observations
* against the given {@link ObservationRegistry} with a custom convention.
* @param observationRegistry the registry to use for recording observations
* @param observationConvention the convention to use for all recorded observations
*/
public ServerHttpObservationFilter(ObservationRegistry observationRegistry, ServerRequestObservationConvention observationConvention) {
this.observationRegistry = observationRegistry;
this.observationConvention = observationConvention;
}
/**
* Get the current {@link ServerRequestObservationContext observation context} from the given request, if available.
* @param exchange the current exchange
* @return the current observation context
*/
public static Optional findObservationContext(ServerWebExchange exchange) {
return Optional.ofNullable(exchange.getAttribute(CURRENT_OBSERVATION_CONTEXT_ATTRIBUTE));
}
@Override
public Mono filter(ServerWebExchange exchange, WebFilterChain chain) {
ServerRequestObservationContext observationContext = new ServerRequestObservationContext(exchange.getRequest(),
exchange.getResponse(), exchange.getAttributes());
exchange.getAttributes().put(CURRENT_OBSERVATION_CONTEXT_ATTRIBUTE, observationContext);
return chain.filter(exchange).transformDeferred(call -> filter(exchange, observationContext, call));
}
private Publisher filter(ServerWebExchange exchange, ServerRequestObservationContext observationContext, Mono call) {
Observation observation = ServerHttpObservationDocumentation.HTTP_REACTIVE_SERVER_REQUESTS.observation(this.observationConvention,
DEFAULT_OBSERVATION_CONVENTION, () -> observationContext, this.observationRegistry);
observation.start();
return call.doOnEach(signal -> {
Throwable throwable = signal.getThrowable();
if (throwable != null) {
if (DISCONNECTED_CLIENT_EXCEPTIONS.contains(throwable.getClass().getSimpleName())) {
observationContext.setConnectionAborted(true);
}
observationContext.setError(throwable);
}
onTerminalSignal(observation, exchange);
})
.doOnCancel(() -> {
observationContext.setConnectionAborted(true);
observation.stop();
})
.contextWrite(context -> context.put(ObservationThreadLocalAccessor.KEY, observation));
}
private void onTerminalSignal(Observation observation, ServerWebExchange exchange) {
ServerHttpResponse response = exchange.getResponse();
if (response.isCommitted()) {
observation.stop();
}
else {
response.beforeCommit(() -> {
observation.stop();
return Mono.empty();
});
}
}
}