Initial ask pattern tracing

1 files changed, 34 insertions, 0 deletions

diff --git a/kamon-trace/src/main/scala/kamon/trace/instrumentation/AskPatternTracing.scala b/kamon-trace/src/main/scala/kamon/trace/instrumentation/AskPatternTracing.scala
new file mode 100644
index 00000000..625ed1ae
--- /dev/null
+++ b/kamon-trace/src/main/scala/kamon/trace/instrumentation/AskPatternTracing.scala
@@ -0,0 +1,34 @@
+package akka.pattern.tracing
+
+import org.aspectj.lang.annotation.{After, AfterReturning, Pointcut, Aspect}
+import akka.pattern.{AskTimeoutException, PromiseActorRef}
+import akka.event.Logging.Warning
+import scala.compat.Platform.EOL
+import akka.actor.ActorRefProvider
+
+@Aspect
+class AskPatternTracing {
+
+  class StackTraceCaptureException extends Throwable
+
+  @Pointcut(value = "execution(* akka.pattern.PromiseActorRef$.apply(..)) && args(provider, *)", argNames = "provider")
+  def promiseActorRefApply(provider: ActorRefProvider): Unit = {
+    provider.settings.config.getBoolean("kamon.trace.ask-pattern-tracing")
+  }
+
+  @AfterReturning(pointcut = "promiseActorRefApply(provider)", returning = "promiseActor")
+  def hookAskTimeoutWarning(provider: ActorRefProvider, promiseActor: PromiseActorRef): Unit = {
+    val future = promiseActor.result.future
+    val system = promiseActor.provider.guardian.underlying.system
+    implicit val ec = system.dispatcher
+    val stack = new StackTraceCaptureException
+
+    future onFailure {
+      case timeout: AskTimeoutException =>
+        val stackString = stack.getStackTrace.drop(3).mkString("", EOL, EOL)
+
+        system.eventStream.publish(Warning("AskPatternTracing", classOf[AskPatternTracing],
+          "Timeout triggered for ask pattern registered at: " + stackString))
+    }
+  }
+}