Subscription timeouts should not hit after stream ref subscribe #24626

akka-stream-tests/src/test/scala/akka/stream/scaladsl/StreamRefsSpec.scala

@@ -3,13 +3,13 @@
  */
 package akka.stream.scaladsl
 
-import akka.NotUsed
+import akka.{ Done, NotUsed }
 import akka.actor.Status.Failure
 import akka.actor.{ Actor, ActorIdentity, ActorLogging, ActorRef, ActorSystem, ActorSystemImpl, Identify, Props }
 import akka.pattern._
 import akka.stream.testkit.TestPublisher
 import akka.stream.testkit.scaladsl._
-import akka.stream.{ ActorMaterializer, SinkRef, SourceRef, StreamRefAttributes }
+import akka.stream._
 import akka.testkit.{ AkkaSpec, ImplicitSender, SocketUtil, TestKit, TestProbe }
 import akka.util.{ ByteString, PrettyDuration }
 import com.typesafe.config._
@@ -17,6 +17,7 @@ import com.typesafe.config._
 import scala.collection.immutable
 import scala.concurrent.duration._
 import scala.concurrent.Future
+import scala.util.Success
 import scala.util.control.NoStackTrace
 
 object StreamRefsSpec {
@@ -68,7 +69,6 @@ object StreamRefsSpec {
           .run()
 
         ref pipeTo sender()
-
       //      case "send-bulk" ⇒
       //        /*
       //         * Here we're able to send a source to a remote recipient
@@ -273,6 +273,17 @@ class StreamRefsSpec(config: Config) extends AkkaSpec(config) with ImplicitSende
       val ex = probe.expectError()
       ex.getMessage should include("has terminated! Tearing down this side of the stream as well.")
     }
+
+    // bug #24626
+    "not receive subscription timeout when got subscribed" in {
+      remoteActor ! "give-subscribe-timeout"
+      val remoteSource: SourceRef[String] = expectMsgType[SourceRef[String]]
+      // materialize directly and start consuming, timeout is 500ms
+      remoteSource.throttle(1, 100.millis, 1, ThrottleMode.Shaping)
+        .take(10) // 10 * 100 millis - way more than timeout for good measure
+        .runWith(Sink.seq)
+        .futureValue // this would fail if it timed out
+    }
   }
 
   "A SinkRef" must {
@@ -338,6 +349,21 @@ class StreamRefsSpec(config: Config) extends AkkaSpec(config) with ImplicitSende
       probe.expectCancellation()
     }
 
+    // bug #24626
+    "now receive timeout if subscribing is already done to the sink ref" in {
+      remoteActor ! "receive-subscribe-timeout"
+      val remoteSink: SinkRef[String] = expectMsgType[SinkRef[String]]
+      Source.repeat("whatever")
+        .throttle(1, 100.millis, 1, ThrottleMode.Shaping)
+        .take(10) // the timeout is 500ms, so this makes sure we run more time than that
+        .runWith(remoteSink)
+
+      (0 to 9).foreach { _ ⇒
+        p.expectMsg("whatever")
+      }
+      p.expectMsg("<COMPLETE>")
+    }
+
     "respect back -pressure from (implied by origin Sink)" in {
       remoteActor ! "receive-32"
       val sinkRef = expectMsgType[SinkRef[String]]

akka-stream/src/main/scala/akka/stream/impl/streamref/SinkRefImpl.scala

@@ -175,6 +175,7 @@ private[stream] final class SinkRefStageImpl[In] private[akka] (
       def observeAndValidateSender(partner: ActorRef, failureMsg: String): Unit = {
         if (partnerRef.isEmpty) {
           partnerRef = OptionVal(partner)
+          cancelTimer(SubscriptionTimeoutTimerKey)
           self.watch(partner)
 
           completedBeforeRemoteConnected match {

akka-stream/src/main/scala/akka/stream/impl/streamref/SourceRefImpl.scala

@@ -139,7 +139,7 @@ private[stream] final class SourceRefStageImpl[Out](
 
       lazy val initialReceive: ((ActorRef, Any)) ⇒ Unit = {
         case (sender, msg @ StreamRefsProtocol.OnSubscribeHandshake(remoteRef)) ⇒
-          cancelTimer("SubscriptionTimeoutTimerKey")
+          cancelTimer(SubscriptionTimeoutTimerKey)
           observeAndValidateSender(remoteRef, "Illegal sender in SequencedOnNext")
           log.debug("[{}] Received handshake {} from {}", stageActorName, msg, sender)