Fix seed-nodes endpoint used by ClusterBootstrap (#2636)

* Fix seed-nodes endpoint used by ClusterBootstrap

* Fix return value

---------

Co-authored-by: Aaron Stannard <aaron@petabridge.com>

src/management/Akka.Management/Cluster/Bootstrap/ContactPoint/HttpClusterBootstrapRoutes.cs

@@ -57,9 +57,18 @@ public override async Task<bool> HandleAsync(IAkkaHttpContext context)
 
  var cluster = Akka.Cluster.Cluster.Get(context.ActorSystem);
 
- ClusterMember MemberToClusterMember(Member m) =>
- new (m.UniqueAddress.Address, m.UniqueAddress.Uid, m.Status, m.Roles);
-
+ if (cluster.SelfMember.Status
+ is MemberStatus.Down
+ or MemberStatus.Exiting
+ or MemberStatus.Leaving
+ or MemberStatus.Removed)
+ {
+ var body = JsonConvert.SerializeObject(
+ new SeedNodes(cluster.SelfMember.UniqueAddress.Address, ImmutableList<ClusterMember>.Empty));
+ await context.HttpContext.Response.WriteAllJsonAsync(body);
+ return true;
+ }
+
  var state = cluster.State;
 
  var members = state.Members
@@ -74,6 +83,9 @@ ClusterMember MemberToClusterMember(Member m) =>
  await context.HttpContext.Response.WriteAllJsonAsync(json);
 
  return true;
+
+ ClusterMember MemberToClusterMember(Member m) =>
+ new (m.UniqueAddress.Address, m.UniqueAddress.Uid, m.Status, m.Roles);
  }
  }