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TracingOperator.java
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TracingOperator.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.webfilter;
import io.opentracing.Scope;
import io.opentracing.Span;
import io.opentracing.SpanContext;
import io.opentracing.Tracer;
import io.opentracing.propagation.Format;
import io.opentracing.tag.Tags;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.CoreSubscriber;
import reactor.core.publisher.Mono;
import reactor.core.publisher.MonoOperator;
import reactor.util.context.Context;
import java.util.List;
/**
* Similar to {@code MonoWebFilterTrace} from spring-cloud-sleuth-core.
*
* @author Csaba Kos
*/
class TracingOperator extends MonoOperator<Void, Void> {
private final Tracer tracer;
private final ServerWebExchange exchange;
private final List<WebFluxSpanDecorator> spanDecorators;
TracingOperator(
final Mono<? extends Void> source,
final ServerWebExchange exchange,
final Tracer tracer,
final List<WebFluxSpanDecorator> spanDecorators
) {
super(source);
this.tracer = tracer;
this.exchange = exchange;
this.spanDecorators = spanDecorators;
}
@Override
public void subscribe(final CoreSubscriber<? super Void> subscriber) {
final Context context = subscriber.currentContext();
final Span parentSpan = context.<Span>getOrEmpty(Span.class).orElseGet(tracer::activeSpan);
final ServerHttpRequest request = exchange.getRequest();
final SpanContext extractedContext;
if (parentSpan != null) {
extractedContext = parentSpan.context();
} else {
extractedContext = tracer.extract(Format.Builtin.HTTP_HEADERS, new HttpHeadersExtractAdapter(request.getHeaders()));
}
final Span span = tracer.buildSpan(request.getMethodValue())
.asChildOf(extractedContext)
.withTag(Tags.SPAN_KIND.getKey(), Tags.SPAN_KIND_SERVER)
.start();
try (final Scope scope = tracer.scopeManager().activate(span)) {
exchange.getAttributes().put(TracingWebFilter.SERVER_SPAN_CONTEXT, span.context());
source.subscribe(new TracingSubscriber(subscriber, exchange, context, span, spanDecorators));
}
}
}