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TracingClientResponseSubscriber.java
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TracingClientResponseSubscriber.java
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/*
* Copyright 2013-2019 the original author or authors. Copyright 2019 The OpenTracing 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
*
* http://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 io.opentracing.contrib.spring.web.client;
import io.opentracing.Span;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.reactivestreams.Subscription;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.web.reactive.function.client.ClientRequest;
import org.springframework.web.reactive.function.client.ClientResponse;
import reactor.core.CoreSubscriber;
import reactor.util.context.Context;
import java.util.List;
/**
* Similar to {@code WebClientTracerSubscriber} from spring-cloud-sleuth-core.
*
* @author Csaba Kos
*/
class TracingClientResponseSubscriber implements CoreSubscriber<ClientResponse> {
private static final Log LOG = LogFactory.getLog(TracingClientResponseSubscriber.class);
private final CoreSubscriber<? super ClientResponse> subscriber;
private final ClientRequest clientRequest;
private final Context context;
private final Span span;
private final List<WebClientSpanDecorator> spanDecorators;
TracingClientResponseSubscriber(
final CoreSubscriber<? super ClientResponse> subscriber,
final ClientRequest clientRequest,
final Context context,
final Span span,
final List<WebClientSpanDecorator> spanDecorators
) {
this.subscriber = subscriber;
this.clientRequest = clientRequest;
this.context = context.put(Span.class, span);
this.span = span;
this.spanDecorators = spanDecorators;
}
@Override
public void onSubscribe(final Subscription subscription) {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onRequest(clientRequest, span)));
subscriber.onSubscribe(new Subscription() {
@Override
public void request(final long n) {
subscription.request(n);
}
@Override
public void cancel() {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onCancel(clientRequest, span)));
subscription.cancel();
span.finish();
}
});
}
@Override
public void onNext(final ClientResponse clientResponse) {
try {
// decorate response body
subscriber.onNext(ClientResponse.from(clientResponse)
.body(clientResponse.bodyToFlux(DataBuffer.class).subscriberContext(context))
.build());
} finally {
spanDecorators.forEach(spanDecorator ->
safelyCall(() -> spanDecorator.onResponse(clientRequest, clientResponse, span)));
}
}
@Override
public void onError(final Throwable throwable) {
try {
subscriber.onError(throwable);
} finally {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onError(clientRequest, throwable, span)));
span.finish();
}
}
@Override
public void onComplete() {
try {
subscriber.onComplete();
} finally {
span.finish();
}
}
@Override
public Context currentContext() {
return context;
}
private void safelyCall(final Runnable runnable) {
try {
runnable.run();
} catch (final RuntimeException e) {
LOG.error("Exception during decorating span", e);
}
}
}