package kamon.instrumentation
import org.aspectj.lang.annotation._
import org.aspectj.lang.ProceedingJoinPoint
import akka.actor.{Props, ActorSystem, ActorRef}
import kamon.{Tracer, TraceContext}
import akka.dispatch.{Envelope, MessageDispatcher}
import com.codahale.metrics.Timer
import scala.Some
import kamon.trace.context.TracingAwareContext
case class TraceableMessage(traceContext: Option[TraceContext], message: Any, timer: Timer.Context)
case class DefaultTracingAwareEnvelopeContext(traceContext: Option[TraceContext] = Tracer.context(), timestamp: Long = System.nanoTime) extends TracingAwareContext
@Aspect("perthis(actorCellCreation(akka.actor.ActorSystem, akka.actor.ActorRef, akka.actor.Props, akka.dispatch.MessageDispatcher, akka.actor.ActorRef))")
class ActorCellInvokeInstrumentation {
@Pointcut("execution(akka.actor.ActorCell.new(..)) && args(system, ref, props, dispatcher, parent)")
def actorCellCreation(system: ActorSystem, ref: ActorRef, props: Props, dispatcher: MessageDispatcher, parent: ActorRef): Unit = {}
@Pointcut("(execution(* akka.actor.ActorCell.invoke(*)) || execution(* akka.routing.RoutedActorCell.sendMessage(*))) && args(envelope)")
def invokingActorBehaviourAtActorCell(envelope: Envelope) = {}
@Around("invokingActorBehaviourAtActorCell(envelope)")
def around(pjp: ProceedingJoinPoint, envelope: Envelope): Unit = {
//safe cast
envelope.asInstanceOf[TracingAwareContext].traceContext match {
case Some(c) => {
Tracer.set(c)
pjp.proceed()
Tracer.clear
}
case None =>
assert(Tracer.context() == None)
pjp.proceed()
}
Tracer.clear
}
}
@Aspect
class EnvelopeTracingContext {
@DeclareMixin("akka.dispatch.Envelope")
def mixin: TracingAwareContext = DefaultTracingAwareEnvelopeContext()
@Pointcut("execution(akka.dispatch.Envelope.new(..)) && this(ctx)")
def requestRecordInit(ctx: TracingAwareContext): Unit = {}
@After("requestRecordInit(ctx)")
def whenCreatedRequestRecord(ctx: TracingAwareContext): Unit = {
// Necessary to force the initialization of TracingAwareRequestContext at the moment of creation.
ctx.traceContext
}
}