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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.{ HttpResponse, HttpMessageEnd, HttpRequest }
import spray.http.HttpHeaders.Host
import kamon.trace.{ TraceRecorder, SegmentCompletionHandleAware, TraceContextAware }
import kamon.metrics.TraceMetrics.HttpClientRequest
import kamon.Kamon
import kamon.spray.Spray
import akka.actor.ActorRef
import scala.concurrent.{ Future, ExecutionContext }
import akka.util.Timeout
@Aspect
class ClientRequestInstrumentation {
import ClientRequestInstrumentation._
@DeclareMixin("spray.can.client.HttpHostConnector.RequestContext")
def mixin: SegmentCompletionHandleAware = SegmentCompletionHandleAware.default
@Pointcut("execution(spray.can.client.HttpHostConnector.RequestContext.new(..)) && this(ctx) && args(request, *, *, *)")
def requestContextCreation(ctx: SegmentCompletionHandleAware, request: HttpRequest): Unit = {}
@After("requestContextCreation(ctx, request)")
def afterRequestContextCreation(ctx: SegmentCompletionHandleAware, 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.segmentCompletionHandle.isEmpty) {
TraceRecorder.currentContext.map { traceContext ⇒
val requestAttributes = basicRequestAttributes(request)
val clientRequestName = Kamon(Spray)(traceContext.system).assignHttpClientRequestName(request)
val completionHandle = traceContext.startSegment(HttpClientRequest(clientRequestName, SprayTime), requestAttributes)
ctx.segmentCompletionHandle = Some(completionHandle)
}
}
}
@Pointcut("execution(* spray.can.client.HttpHostConnector.RequestContext.copy(..)) && this(old)")
def copyingRequestContext(old: SegmentCompletionHandleAware): Unit = {}
@Around("copyingRequestContext(old)")
def aroundCopyingRequestContext(pjp: ProceedingJoinPoint, old: SegmentCompletionHandleAware): Any = {
TraceRecorder.withTraceContext(old.traceContext) {
pjp.proceed()
}
}
@Pointcut("execution(* spray.can.client.HttpHostConnectionSlot.dispatchToCommander(..)) && args(requestContext, message)")
def dispatchToCommander(requestContext: SegmentCompletionHandleAware, message: Any): Unit = {}
@Around("dispatchToCommander(requestContext, message)")
def aroundDispatchToCommander(pjp: ProceedingJoinPoint, requestContext: SegmentCompletionHandleAware, message: Any) = {
requestContext.traceContext match {
case ctx @ Some(_) ⇒
TraceRecorder.withTraceContext(ctx) {
if (message.isInstanceOf[HttpMessageEnd])
requestContext.segmentCompletionHandle.map(_.finish(Map.empty))
pjp.proceed()
}
case None ⇒ pjp.proceed()
}
}
@Pointcut("execution(* spray.client.pipelining$.sendReceive(akka.actor.ActorRef, *, *)) && args(transport, ec, timeout)")
def requestLevelApiSendReceive(transport: ActorRef, ec: ExecutionContext, timeout: Timeout): Unit = {}
@Around("requestLevelApiSendReceive(transport, ec, timeout)")
def aroundRequestLevelApiSendReceive(pjp: ProceedingJoinPoint, transport: ActorRef, ec: ExecutionContext, timeout: Timeout): Any = {
val originalSendReceive = pjp.proceed().asInstanceOf[HttpRequest ⇒ Future[HttpResponse]]
(request: HttpRequest) ⇒ {
val responseFuture = originalSendReceive.apply(request)
TraceRecorder.currentContext.map { traceContext ⇒
val requestAttributes = basicRequestAttributes(request)
val clientRequestName = Kamon(Spray)(traceContext.system).assignHttpClientRequestName(request)
val completionHandle = traceContext.startSegment(HttpClientRequest(clientRequestName, UserTime), requestAttributes)
responseFuture.onComplete { result ⇒
completionHandle.finish(Map.empty)
}(ec)
}
responseFuture
}
}
def basicRequestAttributes(request: HttpRequest): Map[String, String] = {
Map[String, String](
"host" -> request.header[Host].map(_.value).getOrElse("unknown"),
"path" -> request.uri.path.toString(),
"method" -> request.method.toString())
}
}
object ClientRequestInstrumentation {
val SprayTime = "SprayTime"
val UserTime = "UserTime"
}
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