spring BraveAutoConfiguration 源码

springboot BraveAutoConfiguration 代码

文件路径：/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfiguration.java

/*
 * 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.tracing;

import java.util.List;

import brave.Tracing;
import brave.Tracing.Builder;
import brave.TracingCustomizer;
import brave.handler.SpanHandler;
import brave.http.HttpClientHandler;
import brave.http.HttpClientRequest;
import brave.http.HttpClientResponse;
import brave.http.HttpServerHandler;
import brave.http.HttpServerRequest;
import brave.http.HttpServerResponse;
import brave.http.HttpTracing;
import brave.propagation.B3Propagation;
import brave.propagation.CurrentTraceContext;
import brave.propagation.CurrentTraceContext.ScopeDecorator;
import brave.propagation.CurrentTraceContextCustomizer;
import brave.propagation.Propagation.Factory;
import brave.propagation.ThreadLocalCurrentTraceContext;
import brave.sampler.Sampler;
import io.micrometer.tracing.brave.bridge.BraveBaggageManager;
import io.micrometer.tracing.brave.bridge.BraveCurrentTraceContext;
import io.micrometer.tracing.brave.bridge.BraveHttpClientHandler;
import io.micrometer.tracing.brave.bridge.BraveHttpServerHandler;
import io.micrometer.tracing.brave.bridge.BraveTracer;

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.Configuration;
import org.springframework.core.env.Environment;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for Brave.
 *
 * @author Moritz Halbritter
 * @since 3.0.0
 */
@AutoConfiguration(before = MicrometerTracingAutoConfiguration.class)
@ConditionalOnClass(brave.Tracer.class)
@EnableConfigurationProperties(TracingProperties.class)
@ConditionalOnEnabledTracing
public class BraveAutoConfiguration {

	/**
	 * Default value for application name if {@code spring.application.name} is not set.
	 */
	private static final String DEFAULT_APPLICATION_NAME = "application";

	@Bean
	@ConditionalOnMissingBean
	public Tracing braveTracing(Environment environment, List<SpanHandler> spanHandlers,
			List<TracingCustomizer> tracingCustomizers, CurrentTraceContext currentTraceContext,
			Factory propagationFactory, Sampler sampler) {
		String applicationName = environment.getProperty("spring.application.name", DEFAULT_APPLICATION_NAME);
		Builder builder = Tracing.newBuilder().currentTraceContext(currentTraceContext)
				.propagationFactory(propagationFactory).sampler(sampler).localServiceName(applicationName);
		for (SpanHandler spanHandler : spanHandlers) {
			builder.addSpanHandler(spanHandler);
		}
		for (TracingCustomizer tracingCustomizer : tracingCustomizers) {
			tracingCustomizer.customize(builder);
		}
		return builder.build();
	}

	@Bean
	@ConditionalOnMissingBean
	public brave.Tracer braveTracer(Tracing tracing) {
		return tracing.tracer();
	}

	@Bean
	@ConditionalOnMissingBean
	public CurrentTraceContext braveCurrentTraceContext(List<CurrentTraceContext.ScopeDecorator> scopeDecorators,
			List<CurrentTraceContextCustomizer> currentTraceContextCustomizers) {
		ThreadLocalCurrentTraceContext.Builder builder = ThreadLocalCurrentTraceContext.newBuilder();
		for (ScopeDecorator scopeDecorator : scopeDecorators) {
			builder.addScopeDecorator(scopeDecorator);
		}
		for (CurrentTraceContextCustomizer currentTraceContextCustomizer : currentTraceContextCustomizers) {
			currentTraceContextCustomizer.customize(builder);
		}
		return builder.build();
	}

	@Bean
	@ConditionalOnMissingBean
	public Factory bravePropagationFactory() {
		return B3Propagation.newFactoryBuilder().injectFormat(B3Propagation.Format.SINGLE_NO_PARENT).build();
	}

	@Bean
	@ConditionalOnMissingBean
	public Sampler braveSampler(TracingProperties properties) {
		return Sampler.create(properties.getSampling().getProbability());
	}

	@Bean
	@ConditionalOnMissingBean
	public HttpTracing httpTracing(Tracing tracing) {
		return HttpTracing.newBuilder(tracing).build();
	}

	@Bean
	@ConditionalOnMissingBean
	public HttpServerHandler<HttpServerRequest, HttpServerResponse> httpServerHandler(HttpTracing httpTracing) {
		return HttpServerHandler.create(httpTracing);
	}

	@Bean
	@ConditionalOnMissingBean
	public HttpClientHandler<HttpClientRequest, HttpClientResponse> httpClientHandler(HttpTracing httpTracing) {
		return HttpClientHandler.create(httpTracing);
	}

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnClass(BraveTracer.class)
	static class BraveMicrometer {

		@Bean
		@ConditionalOnMissingBean
		BraveTracer braveTracerBridge(brave.Tracer tracer, CurrentTraceContext currentTraceContext,
				BraveBaggageManager braveBaggageManager) {
			return new BraveTracer(tracer, new BraveCurrentTraceContext(currentTraceContext), braveBaggageManager);
		}

		@Bean
		@ConditionalOnMissingBean
		BraveBaggageManager braveBaggageManager() {
			return new BraveBaggageManager();
		}

		@Bean
		@ConditionalOnMissingBean
		BraveHttpServerHandler braveHttpServerHandler(
				HttpServerHandler<HttpServerRequest, HttpServerResponse> httpServerHandler) {
			return new BraveHttpServerHandler(httpServerHandler);
		}

		@Bean
		@ConditionalOnMissingBean
		BraveHttpClientHandler braveHttpClientHandler(
				HttpClientHandler<HttpClientRequest, HttpClientResponse> httpClientHandler) {
			return new BraveHttpClientHandler(httpClientHandler);
		}

	}

}

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