diff options
Diffstat (limited to 'kamon-spray/src/main/scala/spray/can/client/ClientRequestTracing.scala')
-rw-r--r-- | kamon-spray/src/main/scala/spray/can/client/ClientRequestTracing.scala | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/kamon-spray/src/main/scala/spray/can/client/ClientRequestTracing.scala b/kamon-spray/src/main/scala/spray/can/client/ClientRequestTracing.scala new file mode 100644 index 00000000..b081bf00 --- /dev/null +++ b/kamon-spray/src/main/scala/spray/can/client/ClientRequestTracing.scala @@ -0,0 +1,88 @@ +/* =================================================== + * Copyright © 2013 the kamon project <http://kamon.io/> + * + * 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 + * + * http://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 spray.can.client + +import org.aspectj.lang.annotation._ +import org.aspectj.lang.ProceedingJoinPoint +import spray.http.{HttpMessageEnd, HttpRequest} +import spray.http.HttpHeaders.Host +import kamon.trace.{TraceContext, Trace, Segments} +import kamon.trace.Segments.{ContextAndSegmentCompletionAware, HttpClientRequest} +import kamon.trace.Trace.SegmentCompletionHandle + +@Aspect +class ClientRequestTracing { + + @DeclareMixin("spray.can.client.HttpHostConnector.RequestContext") + def mixin: ContextAndSegmentCompletionAware = new ContextAndSegmentCompletionAware { + val traceContext: Option[TraceContext] = Trace.context() + var completionHandle: Option[SegmentCompletionHandle] = None + } + + + @Pointcut("execution(spray.can.client.HttpHostConnector.RequestContext.new(..)) && this(ctx) && args(request, *, *, *)") + def requestContextCreation(ctx: ContextAndSegmentCompletionAware, request: HttpRequest): Unit = {} + + @After("requestContextCreation(ctx, request)") + def afterRequestContextCreation(ctx: ContextAndSegmentCompletionAware, request: HttpRequest): Unit = { + // The RequestContext will be copied when a request needs to be retried but we are only interested in creating the + // completion handle the first time we create one. + + // The read to ctx.completionHandle should take care of initializing the aspect timely. + if(ctx.completionHandle.isEmpty) { + val requestAttributes = Map[String, String]( + "host" -> request.header[Host].map(_.value).getOrElse("unknown"), + "path" -> request.uri.path.toString(), + "method" -> request.method.toString() + ) + val completionHandle = Trace.startSegment(category = HttpClientRequest, attributes = requestAttributes) + ctx.completionHandle = Some(completionHandle) + } + } + + + @Pointcut("execution(* spray.can.client.HttpHostConnector.RequestContext.copy(..)) && this(old)") + def copyingRequestContext(old: ContextAndSegmentCompletionAware): Unit = {} + + @Around("copyingRequestContext(old)") + def aroundCopyingRequestContext(pjp: ProceedingJoinPoint, old: ContextAndSegmentCompletionAware) = { + Trace.withContext(old.traceContext) { + pjp.proceed() + } + } + + + @Pointcut("execution(* spray.can.client.HttpHostConnectionSlot.dispatchToCommander(..)) && args(requestContext, message)") + def dispatchToCommander(requestContext: ContextAndSegmentCompletionAware, message: Any): Unit = {} + + @Around("dispatchToCommander(requestContext, message)") + def aroundDispatchToCommander(pjp: ProceedingJoinPoint, requestContext: ContextAndSegmentCompletionAware, message: Any) = { + requestContext.traceContext match { + case ctx @ Some(_) => + Trace.withContext(ctx) { + if(message.isInstanceOf[HttpMessageEnd]) + requestContext.completionHandle.map(_.complete(Segments.End())) + + pjp.proceed() + } + + case None => pjp.proceed() + } + } + + +}
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