[英]How to access incoming HTTP requests in X-Ray SegmentListener?
我对 Java 使用AWS X-Ray SDK来为我的 Spring Boot 微服务启用 X-Ray 跟踪。 通过以下代码片段,我可以附加自定义SegmentListener
:
final AWSXRayRecorder recorder = AWSXRayRecorderBuilder
.standard()
.withPlugin(new EcsPlugin())
.withSegmentListener(new SLF4JSegmentListener())
.withSegmentListener(new MyHttpHeaderSegementListener())
.build();
AWSXRay.setGlobalRecorder(recorder);
在MyHttpHeaderSegementListener
,我尝试根据传入的 HTTP 请求 header(来自前端)注入 X-Ray 注释:
public class MyHttpHeaderSegementListener implements SegmentListener {
// snippet source: https://stackoverflow.com/a/54349178/6489012
public static Optional<HttpServletRequest> getCurrentHttpRequest() {
return Optional.ofNullable(RequestContextHolder.getRequestAttributes())
.filter(ServletRequestAttributes.class::isInstance)
.map(ServletRequestAttributes.class::cast)
.map(ServletRequestAttributes::getRequest);
}
public MyHttpHeaderSegementListener() {}
@Override
public void onBeginSegment(final Segment segment) {
final var httpContext = MyHttpHeaderSegementListener.getCurrentHttpRequest();
httpContext.ifPresent(context -> segment.putAnnotation("Origin", context.getHeader("Origin")));
}
}
段侦听器按预期触发onBeginSegment
段,但MyHttpHeaderSegementListener.getCurrentHttpRequest()
始终返回Optional.empty
。
SegmentListener
中检查传入的 HTTP 请求(因为它们是由Controller
接收的)?aws-xray-sdk-java
甚至可能支持原生方式吗?RequestContextHolder
中取出来的请求总是空的?(有点题外话,但是:4.根据 HTTP 标头设置注释甚至是一个好习惯)
我对 2. 和 3. 问题没有答案,但我找到了 1. 问题的答案。
对于传入请求,您需要添加一个 Spring 过滤器来配置 AWS X-Ray 。 由于过滤器可以访问 HTTP 请求,我只是将自己的过滤器包装在 AWS 的com.amazonaws.xray.javax.servlet.AWSXRayServletFilter
周围:
public class XRayServletFilter extends AWSXRayServletFilter {
public XRayServletFilter(String fixedSegmentName) {
super(fixedSegmentName);
}
@Override
public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
this.addHttpRequestToContext(request);
super.doFilter(request, response, chain);
}
private void addHttpRequestToContext(final ServletRequest request){
final Optional<HttpServletRequest> httpServletRequest = HttpRequestUtils.castToHttpRequest(request);
if (httpServletRequest.isPresent()) {
final ServletRequestAttributes requestAttributes = new ServletRequestAttributes(httpServletRequest.get());
RequestContextHolder.setRequestAttributes(requestAttributes);
}
}
}
其中使用了我写的 static class:
public final class HttpRequestUtils {
public static Optional<HttpServletRequest> getCurrentHttpRequest() {
return Optional.ofNullable(RequestContextHolder.getRequestAttributes())
.filter(ServletRequestAttributes.class::isInstance)
.map(ServletRequestAttributes.class::cast)
.map(ServletRequestAttributes::getRequest);
}
public static Optional<HttpServletRequest> castToHttpRequest(ServletRequest request) {
try {
return Optional.of((HttpServletRequest) request);
} catch (ClassCastException classCastException) {
return Optional.empty();
}
}
}
这个自定义过滤器基本上在 RequestContextHolder 中设置了RequestContextHolder
请求。 之后,您可以在您的分段侦听器中使用它:
public class MyHttpHeaderSegementListener implements SegmentListener {
public MyHttpHeaderSegementListener() {}
@Override
public void onBeginSegment(final Segment segment) {
final Optional<HttpServletRequest> request = HttpRequestUtils.getCurrentHttpRequest();
request.map(req -> req.getHeader("Origin")).ifPresent(origin -> segment.putAnnotation("client_origin", origin));;
}
}
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