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‎404.html‎

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<!DOCTYPE html>
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‎CNAME‎

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github.io

‎archives/index.html‎

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Try again，fail again，fail better
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Powered by <a href="https://github.com/getgridea/gridea" target="_blank">Gridea</a> | <a class="rss" href="https://sruby.github.io/atom.xml" target="_blank">RSS</a>
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<div class="main-container">
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<h2 class="archives-title">文章归档</h2>
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<div class="archives-container">
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<h2 class="year" data-aos="fade-in" data-aos-delay="500">2023</h2>
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<article class="post">
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<a href="https://sruby.github.io/post/spring-cloud-gateway-ri-zhi-wu-fa-ji-lu-skywalking-de-tid/">
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<h2 class="post-title">
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Spring Cloud Gateway日志无法记录SkyWalking的TID
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</h2>
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</a>
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</article>
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</div>
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<script src="https://unpkg.com/aos@next/dist/aos.js"></script>
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AOS.init();
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var app = new Vue({
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el: '#app',
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data: {
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menuVisible: false,
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},
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})
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</script>
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</body>
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</html>

‎atom.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<feed xmlns="http://www.w3.org/2005/Atom">
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<id>https://sruby.github.io</id>
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<title>Coder</title>
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<updated>2023-02-21T11:35:07.166Z</updated>
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<generator>https://github.com/jpmonette/feed</generator>
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<link rel="alternate" href="https://sruby.github.io"/>
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<link rel="self" href="https://sruby.github.io/atom.xml"/>
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<subtitle>Try again，fail again，fail better</subtitle>
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<logo>https://sruby.github.io/images/avatar.png</logo>
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<icon>https://sruby.github.io/favicon.ico</icon>
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<rights>All rights reserved 2023, Coder</rights>
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<entry>
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<title type="html"><![CDATA[Spring Cloud Gateway日志无法记录SkyWalking的TID]]></title>
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<id>https://sruby.github.io/post/spring-cloud-gateway-ri-zhi-wu-fa-ji-lu-skywalking-de-tid/</id>
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<link href="https://sruby.github.io/post/spring-cloud-gateway-ri-zhi-wu-fa-ji-lu-skywalking-de-tid/">
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</link>
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<updated>2023-02-20T05:58:10.000Z</updated>
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<content type="html"><![CDATA[<h1 id="问题">问题</h1>
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<p>在继承了SkyWalking日志工具的情况下，Spring Cloud Gateway的日志中TID为N/A,其他服务的日志均能够正常记录TID。<br>
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SkyWalking UI可以正常记录包括Spring Cloud Gateway在内的各个服务的TID。</p>
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<h1 id="原因">原因</h1>
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<p>SkyWalking agent plugin只保证将TID传递给OAP，而不保证一定把TID输出到日志。<br>
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如果需要支持，则需要使用方增加此特性。</p>
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<h1 id="agent-plugin源码分析">Agent plugin源码分析</h1>
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<p>Spring Cloud Gateway对应的plugin源码如下：<br>
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Agent plugin：spring-webflux-5.x-plugin<br>
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类：DispatcherHandlerHandleMethodInterceptor</p>
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<pre><code class="language-java">@Override
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public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class&lt;?&gt;[] argumentsTypes,
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MethodInterceptResult result) throws Throwable {
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EnhancedInstance instance = getInstance(allArguments[0]);
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ServerWebExchange exchange = (ServerWebExchange) allArguments[0];
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ContextCarrier carrier = new ContextCarrier();
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CarrierItem next = carrier.items();
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HttpHeaders headers = exchange.getRequest().getHeaders();
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while (next.hasNext()) {
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next = next.next();
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List&lt;String&gt; header = headers.get(next.getHeadKey());
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if (header != null &amp;&amp; header.size() &gt; 0) {
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next.setHeadValue(header.get(0));
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}
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}
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AbstractSpan span = ContextManager.createEntrySpan(exchange.getRequest().getURI().getPath(), carrier);
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if (instance != null &amp;&amp; instance.getSkyWalkingDynamicField() != null) {
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ContextManager.continued((ContextSnapshot) instance.getSkyWalkingDynamicField());
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}
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span.setComponent(ComponentsDefine.SPRING_WEBFLUX);
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SpanLayer.asHttp(span);
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Tags.URL.set(span, exchange.getRequest().getURI().toString());
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HTTP.METHOD.set(span, exchange.getRequest().getMethodValue());
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instance.setSkyWalkingDynamicField(ContextManager.capture());
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span.prepareForAsync();
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ContextManager.stopSpan(span);
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//SKYWALING_SPAN保存到exchange
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exchange.getAttributes().put(&quot;SKYWALING_SPAN&quot;, span);
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}
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</code></pre>
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<h1 id="solution">Solution</h1>
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<h1 id="solution-1">Solution 1</h1>
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<ul>
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<li>只需要在filter中记录TID，便于排查问题，而不保存到日志框架的MDC种。</li>
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<li>根据源码分析部分可以得知plugin会把SKYWALING_SPAN保存到exchange<br>
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中，所以我们可以在exchange中获取SKYWALING_SPAN。</li>
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<li>从exchange中获取到Span对象后，需要通过反射的方式一层层获取到traceid，因为无法直接依赖包含这些类的agent-core包，会跟agent本身发生冲突。</li>
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</ul>
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<pre><code class="language-java">String traceId = &quot;N/A&quot;;
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Object skywalingSpanObject = exchange.getAttributes().get(&quot;SKYWALING_SPAN&quot;);
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if (ObjectUtils.isNotEmpty(skywalingSpanObject)) {
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try {
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Field owner = FieldUtils.getField(skywalingSpanObject.getClass(), &quot;owner&quot;, true);
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Object tracingContext = owner.get(skywalingSpanObject);
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Field segmentField = FieldUtils.getField(tracingContext.getClass(), &quot;segment&quot;, true);
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Object segment = segmentField.get(tracingContext);
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Field relatedGlobalTraceIdField = FieldUtils.getField(segment.getClass(), &quot;relatedGlobalTraceId&quot;, true);
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Object relatedGlobalTraceId = relatedGlobalTraceIdField.get(segment);
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String traceIdObject = relatedGlobalTraceId.toString();
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traceId = Stringutils.substrΩingBetween(traceIdObject, &quot;=&quot;, &quot;)&quot;);
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} catch (Exception e) {
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log.warn(&quot;get TID failed&quot;, e);
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}
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</code></pre>
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<h1 id="reference">Reference</h1>
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<blockquote>
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<p><a href="https://github.com/apache/skywalking/discussions/9232">SpringCloudGateway3.1.3, With apm-log4j2-2.x:8.10.0, does not display the real traceId, always display 'TID: N/A' · Discussion #9232 · apache/skywalking (github.com)</a><br>
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<a href="https://github.com/apache/skywalking/issues/5268">My log can't get traceId when I use Spring Cloud Gateway in my project ,all traceId in my log is &quot;[traceId:TID:N/A]&quot; · Issue #5268 · apache/skywalking (github.com)</a><br>
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<a href="https://www.jianshu.com/p/40727a0b9604">SpringCloudGateway使用Skywalking时日志打印traceId - 简书 (jianshu.com)</a></p>
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</blockquote>
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<p>#SkyWalking<br>
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#SpringCloudGateway<br>
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#MDC<br>
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#TracdID</p>
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]]></content>
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</entry>
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</feed>

‎favicon.ico‎

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