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ClientObservationConventionAdapter.java
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ClientObservationConventionAdapter.java
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/*
* Copyright 2012-2022 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.boot.actuate.autoconfigure.observation.web.client;
import io.micrometer.common.KeyValues;
import io.micrometer.core.instrument.Tag;
import io.micrometer.observation.Observation;
import org.springframework.boot.actuate.metrics.web.reactive.client.WebClientExchangeTagsProvider;
import org.springframework.core.Conventions;
import org.springframework.web.reactive.function.client.ClientRequest;
import org.springframework.web.reactive.function.client.ClientRequestObservationContext;
import org.springframework.web.reactive.function.client.ClientRequestObservationConvention;
import org.springframework.web.reactive.function.client.WebClient;
/**
* Adapter class that applies {@link WebClientExchangeTagsProvider} tags as a
* {@link ClientRequestObservationConvention}.
*
* @author Brian Clozel
*/
@SuppressWarnings("removal")
class ClientObservationConventionAdapter implements ClientRequestObservationConvention {
private static final String URI_TEMPLATE_ATTRIBUTE = Conventions.getQualifiedAttributeName(WebClient.class,
"uriTemplate");
private final String metricName;
private final WebClientExchangeTagsProvider tagsProvider;
ClientObservationConventionAdapter(String metricName, WebClientExchangeTagsProvider tagsProvider) {
this.metricName = metricName;
this.tagsProvider = tagsProvider;
}
@Override
public boolean supportsContext(Observation.Context context) {
return context instanceof ClientRequestObservationContext;
}
@Override
public KeyValues getLowCardinalityKeyValues(ClientRequestObservationContext context) {
mutateClientRequest(context);
Iterable<Tag> tags = this.tagsProvider.tags(context.getRequest(), context.getResponse(), context.getError());
return KeyValues.of(tags, Tag::getKey, Tag::getValue);
}
private void mutateClientRequest(ClientRequestObservationContext context) {
// WebClientExchangeTagsProvider relies on a request attribute to get the URI
// template, we need to adapt to that.
ClientRequest clientRequest = ClientRequest.from(context.getRequest())
.attribute(URI_TEMPLATE_ATTRIBUTE, context.getUriTemplate()).build();
context.setRequest(clientRequest);
}
@Override
public KeyValues getHighCardinalityKeyValues(ClientRequestObservationContext context) {
return KeyValues.empty();
}
@Override
public String getName() {
return this.metricName;
}
}