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Spring Boot Actuator AutoConfigure
/*
* Copyright 2012-2023 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.tracing;
import java.util.Collections;
import java.util.List;
import io.micrometer.tracing.SpanCustomizer;
import io.micrometer.tracing.exporter.SpanExportingPredicate;
import io.micrometer.tracing.exporter.SpanFilter;
import io.micrometer.tracing.exporter.SpanReporter;
import io.micrometer.tracing.otel.bridge.CompositeSpanExporter;
import io.micrometer.tracing.otel.bridge.EventListener;
import io.micrometer.tracing.otel.bridge.EventPublishingContextWrapper;
import io.micrometer.tracing.otel.bridge.OtelBaggageManager;
import io.micrometer.tracing.otel.bridge.OtelCurrentTraceContext;
import io.micrometer.tracing.otel.bridge.OtelPropagator;
import io.micrometer.tracing.otel.bridge.OtelSpanCustomizer;
import io.micrometer.tracing.otel.bridge.OtelTracer;
import io.micrometer.tracing.otel.bridge.OtelTracer.EventPublisher;
import io.micrometer.tracing.otel.bridge.Slf4JEventListener;
import io.opentelemetry.api.OpenTelemetry;
import io.opentelemetry.api.metrics.MeterProvider;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.context.ContextStorage;
import io.opentelemetry.context.propagation.ContextPropagators;
import io.opentelemetry.context.propagation.TextMapPropagator;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.trace.SdkTracerProvider;
import io.opentelemetry.sdk.trace.SdkTracerProviderBuilder;
import io.opentelemetry.sdk.trace.SpanProcessor;
import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
import io.opentelemetry.sdk.trace.export.BatchSpanProcessorBuilder;
import io.opentelemetry.sdk.trace.export.SpanExporter;
import io.opentelemetry.sdk.trace.samplers.Sampler;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.SpringBootVersion;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
/**
* {@link EnableAutoConfiguration Auto-configuration} for OpenTelemetry tracing.
*
* @author Moritz Halbritter
* @author Marcin Grzejszczak
* @author Yanming Zhou
* @since 3.0.0
*/
@AutoConfiguration(value = "openTelemetryTracingAutoConfiguration",
before = { MicrometerTracingAutoConfiguration.class, NoopTracerAutoConfiguration.class })
@ConditionalOnClass({ OtelTracer.class, SdkTracerProvider.class, OpenTelemetry.class })
@EnableConfigurationProperties(TracingProperties.class)
@Import({ OpenTelemetryPropagationConfigurations.PropagationWithoutBaggage.class,
OpenTelemetryPropagationConfigurations.PropagationWithBaggage.class,
OpenTelemetryPropagationConfigurations.NoPropagation.class })
public class OpenTelemetryAutoConfiguration {
private final TracingProperties tracingProperties;
OpenTelemetryAutoConfiguration(TracingProperties tracingProperties) {
this.tracingProperties = tracingProperties;
}
@Bean
@ConditionalOnMissingBean
SdkTracerProvider otelSdkTracerProvider(Resource resource, SpanProcessors spanProcessors, Sampler sampler,
ObjectProvider customizers) {
SdkTracerProviderBuilder builder = SdkTracerProvider.builder().setSampler(sampler).setResource(resource);
spanProcessors.forEach(builder::addSpanProcessor);
customizers.orderedStream().forEach((customizer) -> customizer.customize(builder));
return builder.build();
}
@Bean
@ConditionalOnMissingBean
ContextPropagators otelContextPropagators(ObjectProvider textMapPropagators) {
return ContextPropagators.create(TextMapPropagator.composite(textMapPropagators.orderedStream().toList()));
}
@Bean
@ConditionalOnMissingBean
Sampler otelSampler() {
Sampler rootSampler = Sampler.traceIdRatioBased(this.tracingProperties.getSampling().getProbability());
return Sampler.parentBased(rootSampler);
}
@Bean
@ConditionalOnMissingBean
SpanProcessors spanProcessors(ObjectProvider spanProcessors) {
return SpanProcessors.of(spanProcessors.orderedStream().toList());
}
@Bean
BatchSpanProcessor otelSpanProcessor(SpanExporters spanExporters,
ObjectProvider spanExportingPredicates, ObjectProvider spanReporters,
ObjectProvider spanFilters, ObjectProvider meterProvider) {
BatchSpanProcessorBuilder builder = BatchSpanProcessor
.builder(new CompositeSpanExporter(spanExporters.list(), spanExportingPredicates.orderedStream().toList(),
spanReporters.orderedStream().toList(), spanFilters.orderedStream().toList()));
meterProvider.ifAvailable(builder::setMeterProvider);
return builder.build();
}
@Bean
@ConditionalOnMissingBean
SpanExporters spanExporters(ObjectProvider spanExporters) {
return SpanExporters.of(spanExporters.orderedStream().toList());
}
@Bean
@ConditionalOnMissingBean
Tracer otelTracer(OpenTelemetry openTelemetry) {
return openTelemetry.getTracer("org.springframework.boot", SpringBootVersion.getVersion());
}
@Bean
@ConditionalOnMissingBean(io.micrometer.tracing.Tracer.class)
OtelTracer micrometerOtelTracer(Tracer tracer, EventPublisher eventPublisher,
OtelCurrentTraceContext otelCurrentTraceContext) {
return new OtelTracer(tracer, otelCurrentTraceContext, eventPublisher,
new OtelBaggageManager(otelCurrentTraceContext, this.tracingProperties.getBaggage().getRemoteFields(),
Collections.emptyList()));
}
@Bean
@ConditionalOnMissingBean
OtelPropagator otelPropagator(ContextPropagators contextPropagators, Tracer tracer) {
return new OtelPropagator(contextPropagators, tracer);
}
@Bean
@ConditionalOnMissingBean
EventPublisher otelTracerEventPublisher(List eventListeners) {
return new OTelEventPublisher(eventListeners);
}
@Bean
@ConditionalOnMissingBean
OtelCurrentTraceContext otelCurrentTraceContext(EventPublisher publisher) {
ContextStorage.addWrapper(new EventPublishingContextWrapper(publisher));
return new OtelCurrentTraceContext();
}
@Bean
@ConditionalOnMissingBean
Slf4JEventListener otelSlf4JEventListener() {
return new Slf4JEventListener();
}
@Bean
@ConditionalOnMissingBean(SpanCustomizer.class)
OtelSpanCustomizer otelSpanCustomizer() {
return new OtelSpanCustomizer();
}
static class OTelEventPublisher implements EventPublisher {
private final List listeners;
OTelEventPublisher(List listeners) {
this.listeners = listeners;
}
@Override
public void publishEvent(Object event) {
for (EventListener listener : this.listeners) {
listener.onEvent(event);
}
}
}
}