Introduce missing team role if necessary (#23276)

* Introduce missing team role if necessary (#23243)

When receiving gossip from a node that did not contain any team
information (such as gossip from a node running a previous version of
Akka), add the default team role during deserialization.

* Simpler implementation of adding default role

* More efficient `rolesFromProto`

Now actually outperforms the previous implementation. Still room for
improvement as this probably checks for duplicates in the set on each add,
but creating our own array-backed set here is probably going overboard :).

* Fixes following rebase

akka-cluster/src/main/scala/akka/cluster/protobuf/ClusterMessageSerializer.scala

@@ -346,7 +346,23 @@ class ClusterMessageSerializer(val system: ExtendedActorSystem) extends BaseSeri
 
     def memberFromProto(member: cm.Member) =
       new Member(addressMapping(member.getAddressIndex), member.getUpNumber, memberStatusFromInt(member.getStatus.getNumber),
-        member.getRolesIndexesList.asScala.map(roleMapping(_))(breakOut))
+        rolesFromProto(member.getRolesIndexesList.asScala))
+
+    def rolesFromProto(roleIndexes: Seq[Integer]): Set[String] = {
+      var containsDc = false
+      var roles = Set.empty[String]
+
+      for {
+        roleIndex ← roleIndexes
+        role = roleMapping(roleIndex)
+      } {
+        if (role.startsWith(ClusterSettings.TeamRolePrefix)) containsDc = true
+        roles += role
+      }
+
+      if (!containsDc) roles + (ClusterSettings.TeamRolePrefix + "default")
+      else roles
+    }
 
     def tombstoneFromProto(tombstone: cm.Tombstone): (UniqueAddress, Long) =
       (addressMapping(tombstone.getAddressIndex), tombstone.getTimestamp)

akka-cluster/src/multi-jvm/scala/akka/cluster/QuickRestartSpec.scala

@@ -91,7 +91,7 @@ abstract class QuickRestartSpec
             Cluster(system).state.members.size should ===(totalNumberOfNodes)
             Cluster(system).state.members.map(_.status == MemberStatus.Up)
             // use the role to test that it is the new incarnation that joined, sneaky
-            Cluster(system).state.members.flatMap(_.roles) should ===(Set(s"round-$n", "team-default"))
+            Cluster(system).state.members.flatMap(_.roles) should ===(Set(s"round-$n", ClusterSettings.TeamRolePrefix + "default"))
           }
         }
         enterBarrier("members-up-" + n)

akka-cluster/src/test/scala/akka/cluster/protobuf/ClusterMessageSerializerSpec.scala

@@ -16,16 +16,18 @@ class ClusterMessageSerializerSpec extends AkkaSpec(
 
   val serializer = new ClusterMessageSerializer(system.asInstanceOf[ExtendedActorSystem])
 
-  def checkSerialization(obj: AnyRef): Unit = {
+  def roundtrip[T <: AnyRef](obj: T): T = {
     val blob = serializer.toBinary(obj)
-    val ref = serializer.fromBinary(blob, obj.getClass)
-    obj match {
-      case env: GossipEnvelope ⇒
-        val env2 = ref.asInstanceOf[GossipEnvelope]
+    serializer.fromBinary(blob, obj.getClass).asInstanceOf[T]
+  }
+
+  def checkSerialization(obj: AnyRef): Unit = {
+    (obj, roundtrip(obj)) match {
+      case (env: GossipEnvelope, env2: GossipEnvelope) ⇒
         env2.from should ===(env.from)
         env2.to should ===(env.to)
         env2.gossip should ===(env.gossip)
-      case _ ⇒
+      case (_, ref) ⇒
         ref should ===(obj)
     }
 
@@ -35,10 +37,10 @@ class ClusterMessageSerializerSpec extends AkkaSpec(
 
   val a1 = TestMember(Address("akka.tcp", "sys", "a", 2552), Joining, Set.empty)
   val b1 = TestMember(Address("akka.tcp", "sys", "b", 2552), Up, Set("r1"))
-  val c1 = TestMember(Address("akka.tcp", "sys", "c", 2552), Leaving, Set("r2"))
-  val d1 = TestMember(Address("akka.tcp", "sys", "d", 2552), Exiting, Set("r1", "r2"))
+  val c1 = TestMember(Address("akka.tcp", "sys", "c", 2552), Leaving, Set.empty, "foo")
+  val d1 = TestMember(Address("akka.tcp", "sys", "d", 2552), Exiting, Set("r1"), "foo")
   val e1 = TestMember(Address("akka.tcp", "sys", "e", 2552), Down, Set("r3"))
-  val f1 = TestMember(Address("akka.tcp", "sys", "f", 2552), Removed, Set("r2", "r3"))
+  val f1 = TestMember(Address("akka.tcp", "sys", "f", 2552), Removed, Set("r3"), "foo")
 
   "ClusterMessages" must {
 
@@ -77,6 +79,12 @@ class ClusterMessageSerializerSpec extends AkkaSpec(
 
       checkSerialization(InternalClusterAction.Welcome(uniqueAddress, g2))
     }
+
+    "add a default team role if none is present" in {
+      val env = roundtrip(GossipEnvelope(a1.uniqueAddress, d1.uniqueAddress, Gossip(SortedSet(a1, d1))))
+      env.gossip.members.head.roles should be(Set(ClusterSettings.TeamRolePrefix + "default"))
+      env.gossip.members.tail.head.roles should be(Set("r1", ClusterSettings.TeamRolePrefix + "foo"))
+    }
   }
   "Cluster router pool" must {
     "be serializable" in {