/
TracingSubscriber.java
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/
TracingSubscriber.java
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/*
* Copyright 2013-2020 the original author or authors. Copyright 2020 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.webfilter;
import io.opentracing.Span;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.reactivestreams.Subscription;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.CoreSubscriber;
import reactor.util.context.Context;
import java.util.List;
/**
* Similar to {@code WebFilterTraceSubscriber} from spring-could-sleuth-core.
*
* @author Csaba Kos
*/
class TracingSubscriber implements CoreSubscriber<Void> {
private static final Log LOG = LogFactory.getLog(TracingSubscriber.class);
private final CoreSubscriber<? super Void> subscriber;
private final ServerWebExchange exchange;
private final Context context;
private final Span span;
private final List<WebFluxSpanDecorator> spanDecorators;
TracingSubscriber(
final CoreSubscriber<? super Void> subscriber,
final ServerWebExchange exchange,
final Context context,
final Span span,
final List<WebFluxSpanDecorator> spanDecorators
) {
this.subscriber = subscriber;
this.exchange = exchange;
this.context = context.put(Span.class, span);
this.span = span;
this.spanDecorators = spanDecorators;
}
@Override
public void onSubscribe(final Subscription subscription) {
subscriber.onSubscribe(new Subscription() {
@Override
public void request(long n) {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onRequest(exchange, span)));
subscription.request(n);
}
@Override
public void cancel() {
span.finish();
exchange.getAttributes().remove(TracingWebFilter.SERVER_SPAN_CONTEXT);
subscription.cancel();
}
});
}
@Override
public void onNext(final Void aVoid) {
// Never called
subscriber.onNext(aVoid);
}
@Override
public void onError(final Throwable throwable) {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onError(exchange, throwable, span)));
span.finish();
exchange.getAttributes().remove(TracingWebFilter.SERVER_SPAN_CONTEXT);
subscriber.onError(throwable);
}
@Override
public void onComplete() {
spanDecorators.forEach(spanDecorator -> safelyCall(() -> spanDecorator.onResponse(exchange, span)));
span.finish();
exchange.getAttributes().remove(TracingWebFilter.SERVER_SPAN_CONTEXT);
subscriber.onComplete();
}
@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);
}
}
}