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/*
* =========================================================================================
* Copyright © 2013-2014 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 akka.kamon.instrumentation
import kamon.Kamon
import kamon.extension.akka.Akka
import kamon.trace.TraceContextAware
import akka.actor.{ ActorSystem, ActorRef }
import akka.event.Logging.Warning
import akka.pattern.AskTimeoutException
import org.aspectj.lang.ProceedingJoinPoint
import org.aspectj.lang.annotation._
import org.aspectj.lang.reflect.SourceLocation
import scala.concurrent.Future
import scala.compat.Platform.EOL
@Aspect
class AskPatternInstrumentation {
import AskPatternInstrumentation._
@DeclareMixin("akka.pattern.AskableActorRef$")
def mixinContextAwareToAskableActorRef: TraceContextAware = TraceContextAware.default
@Pointcut("call(* akka.pattern.AskableActorRef$.$qmark$extension(..)) && target(ctx) && args(actor, *, *)")
def askableActorRefAsk(ctx: TraceContextAware, actor: ActorRef): Unit = {}
@Around("askableActorRefAsk(ctx, actor)")
def hookAskTimeoutWarning(pjp: ProceedingJoinPoint, ctx: TraceContextAware, actor: ActorRef): AnyRef = {
implicit val system = ctx.traceContext.system
val akkaExtension = Kamon(Akka)(system)
val future = pjp.proceed().asInstanceOf[Future[AnyRef]]
val handler = akkaExtension.askPatternTimeoutWarning match {
case "off" ⇒ None
case "lightweight" ⇒ Some(errorHandler(callInfo = Some(CallInfo(s"${actor.path.name} ?", pjp.getSourceLocation))))
case "heavyweight" ⇒ Some(errorHandler(stack = Some(new StackTraceCaptureException)))
}
handler.map(h ⇒ future.onFailure(h)(akkaExtension.dispatcher))
future
}
def errorHandler(callInfo: Option[CallInfo] = None, stack: Option[StackTraceCaptureException] = None)(implicit system: ActorSystem): ErrorHandler = {
case e: AskTimeoutException ⇒
val message = {
if (stack.isDefined) stack.map(s ⇒ s.getStackTrace.drop(3).mkString("", EOL, EOL))
else callInfo.map(_.message)
}
publish(message)
}
def publish(message: Option[String])(implicit system: ActorSystem) = message map { msg ⇒
system.eventStream.publish(Warning("AskPatternTracing", classOf[AskPatternInstrumentation],
s"Timeout triggered for ask pattern registered at: $msg"))
}
}
object AskPatternInstrumentation {
type ErrorHandler = PartialFunction[Throwable, Unit]
class StackTraceCaptureException extends Throwable
case class CallInfo(name: String, sourceLocation: SourceLocation) {
def message: String = {
def locationInfo: String = Option(sourceLocation).map(location ⇒ s"${location.getFileName}:${location.getLine}").getOrElse("<unknown position>")
def line: String = s"$name @ $locationInfo"
s"$line"
}
}
}
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