46 lines
8.9 KiB
HTML
46 lines
8.9 KiB
HTML
<html><head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>12. Customizations</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="multi__managing_spans_with_annotations.html" title="11. Managing spans with annotations"><link rel="next" href="multi__sending_spans_to_zipkin.html" title="13. Sending spans to Zipkin"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">12. Customizations</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__managing_spans_with_annotations.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi__sending_spans_to_zipkin.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_customizations" href="#_customizations"></a>12. Customizations</h1></div></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_spring_integration" href="#_spring_integration"></a>12.1 Spring Integration</h2></div></div></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_http" href="#_http"></a>12.2 HTTP</h2></div></div></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_tracefilter" href="#_tracefilter"></a>12.3 TraceFilter</h2></div></div></div><p>You can also modify the behaviour of the <code class="literal">TraceFilter</code> - the component that is responsible
|
|
for processing the input HTTP request and adding tags basing on the HTTP response. You can customize
|
|
the tags, or modify the response headers by registering your own instance of the <code class="literal">TraceFilter</code> bean.</p><p>In the following example we will register the <code class="literal">TraceFilter</code> bean and we will add the
|
|
<code class="literal">ZIPKIN-TRACE-ID</code> response header containing the current Span’s trace id. Also we will
|
|
add to the Span a tag with key <code class="literal">custom</code> and a value <code class="literal">tag</code>.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Component</span></em>
|
|
<em><span class="hl-annotation" style="color: gray">@Order(TraceFilter.ORDER + 1)</span></em>
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> MyFilter <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">extends</span> GenericFilterBean {
|
|
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">private</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">final</span> Tracer tracer;
|
|
|
|
MyFilter(Tracer tracer) {
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.tracer = tracer;
|
|
}
|
|
|
|
<em><span class="hl-annotation" style="color: gray">@Override</span></em> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> doFilter(ServletRequest request, ServletResponse response,
|
|
FilterChain chain) <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">throws</span> IOException, ServletException {
|
|
Span currentSpan = <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.tracer.currentSpan();
|
|
then(currentSpan).isNotNull();
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// for readability we're returning trace id in a hex form</span>
|
|
((HttpServletResponse) response)
|
|
.addHeader(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"ZIPKIN-TRACE-ID"</span>,
|
|
currentSpan.context().traceIdString());
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// we can also add some custom tags</span>
|
|
currentSpan.tag(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"custom"</span>, <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"tag"</span>);
|
|
chain.doFilter(request, response);
|
|
}
|
|
}</pre></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_custom_service_name" href="#_custom_service_name"></a>12.4 Custom service name</h2></div></div></div><p>By default Sleuth assumes that when you send a span to Zipkin, you want the span’s service name
|
|
to be equal to <code class="literal">spring.application.name</code> value. That’s not always the case though. There
|
|
are situations in which you want to explicitly provide a different service name for all spans coming
|
|
from your application. To achieve that it’s enough to just pass the following property
|
|
to your application to override that value (example for <code class="literal">foo</code> service name):</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring.zipkin.service.name</span>: foo</pre></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_customization_of_reported_spans" href="#_customization_of_reported_spans"></a>12.5 Customization of reported spans</h2></div></div></div><p>Before reporting spans to e.g. Zipkin you can be interested in modifying that span in some way.
|
|
You can achieve that by using the <code class="literal">SpanAdjuster</code> interface.</p><p>In Sleuth we’re generating spans with a fixed name. Some users want to modify the name depending on values
|
|
of tags. Implementation of the <code class="literal">SpanAdjuster</code> interface can be used to alter that name. Example:</p><p>Example. If you register two beans of <code class="literal">SpanAdjuster</code> type:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Bean</span></em> SpanAdjuster adjusterOne() {
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> span -> span.toBuilder().name(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"foo"</span>).build();
|
|
}
|
|
|
|
<em><span class="hl-annotation" style="color: gray">@Bean</span></em> SpanAdjuster adjusterTwo() {
|
|
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> span -> span.toBuilder().name(span.name() + <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">" bar"</span>).build();
|
|
}</pre><p>This will lead in changing the name of the reported span to <code class="literal">foo bar</code>, just before it gets reported (e.g. to Zipkin).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_host_locator" href="#_host_locator"></a>12.6 Host locator</h2></div></div></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>This section is about defining <span class="strong"><strong>host</strong></span> from service discovery. It’s <span class="strong"><strong>NOT</strong></span>
|
|
about finding Zipkin in service discovery.</p></td></tr></table></div><p>In order to define the host that is corresponding to a particular span we need to resolve the host name
|
|
and port. The default approach is to take it from server properties. If those for some reason are not set
|
|
then we’re trying to retrieve the host name from the network interfaces.</p><p>If you have the discovery client enabled and prefer to retrieve the host address from the registered
|
|
instance in a service registry then you have to set the property (it’s applicable for both HTTP and
|
|
Stream based span reporting).</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-attribute">spring.zipkin.locator.discovery.enabled</span>: <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">true</span></pre></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__managing_spans_with_annotations.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="multi__sending_spans_to_zipkin.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">11. Managing spans with annotations </td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-sleuth.html">Home</a></td><td width="40%" align="right" valign="top"> 13. Sending spans to Zipkin</td></tr></table></div></body></html> |