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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._
import spray.http.HttpHeaders.RawHeader
import kamon.trace._
import kamon.Kamon
import kamon.spray.{ ClientSegmentCollectionStrategy, Spray }
import akka.actor.ActorRef
import scala.concurrent.{ Future, ExecutionContext }
import akka.util.Timeout
@Aspect
class ClientRequestInstrumentation {
@DeclareMixin("spray.can.client.HttpHostConnector.RequestContext")
def mixinTraceContextAwareToRequestContext: TraceContextAware = TraceContextAware.default
@DeclareMixin("spray.can.client.HttpHostConnector.RequestContext")
def mixinSegmentAwareToRequestContext: SegmentAware = SegmentAware.default
@DeclareMixin("spray.http.HttpRequest")
def mixinSegmentAwareToHttpRequest: SegmentAware = SegmentAware.default
@Pointcut("execution(spray.can.client.HttpHostConnector.RequestContext.new(..)) && this(requestContext) && args(request, *, *, *)")
def requestContextCreation(requestContext: SegmentAware with TraceContextAware, request: HttpRequest): Unit = {}
@After("requestContextCreation(requestContext, request)")
def afterRequestContextCreation(requestContext: SegmentAware with TraceContextAware, request: HttpRequest): Unit = {
// This read to requestContext.traceContext takes care of initializing the aspect timely.
requestContext.traceContext
TraceRecorder.withTraceContextAndSystem { (ctx, system) ⇒
val sprayExtension = Kamon(Spray)(system)
if (sprayExtension.clientSegmentCollectionStrategy == ClientSegmentCollectionStrategy.Internal) {
if (requestContext.segment.isEmpty) {
val clientRequestName = sprayExtension.generateHostLevelApiSegmentName(request)
val segment = ctx.startSegment(clientRequestName, SegmentMetricIdentityLabel.HttpClient)
requestContext.segment = segment
}
} else {
// We have a Request Level API, let's just make sure that we rename it accordingly. The reason for assigning a
// name again here is that when the request was initially sent it might not have the Host information available
// and it might be important to decide a proper segment name.
val clientRequestName = sprayExtension.generateHostLevelApiSegmentName(request)
request.asInstanceOf[SegmentAware].segment.rename(clientRequestName)
}
}
}
@Pointcut("execution(* spray.can.client.HttpHostConnector.RequestContext.copy(..)) && this(old)")
def copyingRequestContext(old: TraceContextAware): Unit = {}
@Around("copyingRequestContext(old)")
def aroundCopyingRequestContext(pjp: ProceedingJoinPoint, old: TraceContextAware): Any = {
TraceRecorder.withInlineTraceContextReplacement(old.traceContext) {
pjp.proceed()
}
}
@Pointcut("execution(* spray.can.client.HttpHostConnectionSlot.dispatchToCommander(..)) && args(requestContext, message)")
def dispatchToCommander(requestContext: TraceContextAware, message: Any): Unit = {}
@Around("dispatchToCommander(requestContext, message)")
def aroundDispatchToCommander(pjp: ProceedingJoinPoint, requestContext: TraceContextAware, message: Any): Any = {
if (requestContext.traceContext.nonEmpty) {
TraceRecorder.withInlineTraceContextReplacement(requestContext.traceContext) {
if (message.isInstanceOf[HttpMessageEnd])
requestContext.asInstanceOf[SegmentAware].segment.finish()
pjp.proceed()
}
} else pjp.proceed()
}
@Pointcut("execution(* spray.http.HttpRequest.copy(..)) && this(old)")
def copyingHttpRequest(old: SegmentAware): Unit = {}
@Around("copyingHttpRequest(old)")
def aroundCopyingHttpRequest(pjp: ProceedingJoinPoint, old: SegmentAware): Any = {
val copiedHttpRequest = pjp.proceed().asInstanceOf[SegmentAware]
copiedHttpRequest.segment = old.segment
copiedHttpRequest
}
@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) ⇒ {
TraceRecorder.withTraceContextAndSystem { (ctx, system) ⇒
val sprayExtension = Kamon(Spray)(system)
val segment =
if (sprayExtension.clientSegmentCollectionStrategy == ClientSegmentCollectionStrategy.Pipelining)
ctx.startSegment(sprayExtension.generateRequestLevelApiSegmentName(request), SegmentMetricIdentityLabel.HttpClient)
else
EmptyTraceContext.EmptySegment
request.asInstanceOf[SegmentAware].segment = segment
val responseFuture = originalSendReceive.apply(request)
responseFuture.onComplete { result ⇒
segment.finish()
}(ec)
responseFuture
} getOrElse (originalSendReceive.apply(request))
}
}
@Pointcut("execution(* spray.http.HttpMessage.withDefaultHeaders(*)) && this(request) && args(defaultHeaders)")
def includingDefaultHeadersAtHttpHostConnector(request: HttpMessage, defaultHeaders: List[HttpHeader]): Unit = {}
@Around("includingDefaultHeadersAtHttpHostConnector(request, defaultHeaders)")
def aroundIncludingDefaultHeadersAtHttpHostConnector(pjp: ProceedingJoinPoint, request: HttpMessage, defaultHeaders: List[HttpHeader]): Any = {
val modifiedHeaders = TraceRecorder.withTraceContextAndSystem { (ctx, system) ⇒
val sprayExtension = Kamon(Spray)(system)
if (sprayExtension.includeTraceToken)
RawHeader(sprayExtension.traceTokenHeaderName, ctx.token) :: defaultHeaders
else
defaultHeaders
} getOrElse (defaultHeaders)
pjp.proceed(Array[AnyRef](request, modifiedHeaders))
}
}
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