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/* ===================================================
* 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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