org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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.boot.actuate.metrics.web.reactive.server;
import java.util.concurrent.TimeUnit;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
/**
* Intercepts incoming HTTP requests handled by Spring WebFlux handlers.
*
* @author Jon Schneider
* @author Brian Clozel
* @since 2.0.0
*/
@Order(Ordered.HIGHEST_PRECEDENCE + 1)
public class MetricsWebFilter implements WebFilter {
private final MeterRegistry registry;
private final WebFluxTagsProvider tagsProvider;
private final String metricName;
private final boolean autoTimeRequests;
/**
* Create a new {@code MetricsWebFilter}.
* @param registry the registry to which metrics are recorded
* @param tagsProvider provider for metrics tags
* @param metricName name of the metric to record
* @deprecated since 2.0.6 in favor of
* {@link #MetricsWebFilter(MeterRegistry, WebFluxTagsProvider, String, boolean)}
*/
@Deprecated
public MetricsWebFilter(MeterRegistry registry, WebFluxTagsProvider tagsProvider,
String metricName) {
this(registry, tagsProvider, metricName, true);
}
public MetricsWebFilter(MeterRegistry registry, WebFluxTagsProvider tagsProvider,
String metricName, boolean autoTimeRequests) {
this.registry = registry;
this.tagsProvider = tagsProvider;
this.metricName = metricName;
this.autoTimeRequests = autoTimeRequests;
}
@Override
public Mono filter(ServerWebExchange exchange, WebFilterChain chain) {
if (this.autoTimeRequests) {
return chain.filter(exchange).compose((call) -> filter(exchange, call));
}
return chain.filter(exchange);
}
private Publisher filter(ServerWebExchange exchange, Mono call) {
long start = System.nanoTime();
ServerHttpResponse response = exchange.getResponse();
return call.doOnSuccess((done) -> success(exchange, start)).doOnError((cause) -> {
if (response.isCommitted()) {
error(exchange, start, cause);
}
else {
response.beforeCommit(() -> {
error(exchange, start, cause);
return Mono.empty();
});
}
});
}
private void success(ServerWebExchange exchange, long start) {
Iterable tags = this.tagsProvider.httpRequestTags(exchange, null);
this.registry.timer(this.metricName, tags).record(System.nanoTime() - start,
TimeUnit.NANOSECONDS);
}
private void error(ServerWebExchange exchange, long start, Throwable cause) {
Iterable tags = this.tagsProvider.httpRequestTags(exchange, cause);
this.registry.timer(this.metricName, tags).record(System.nanoTime() - start,
TimeUnit.NANOSECONDS);
}
}