feat: complete final jetstream parity transport and runtime baselines

src/NATS.Server/JetStream/ConsumerManager.cs

@@ -4,6 +4,7 @@ using NATS.Server.JetStream.Cluster;
 using NATS.Server.JetStream.Consumers;
 using NATS.Server.JetStream.Models;
 using NATS.Server.JetStream.Storage;
+using NATS.Server.Subscriptions;
 
 namespace NATS.Server.JetStream;
 
@@ -24,7 +25,15 @@ public sealed class ConsumerManager
     public JetStreamApiResponse CreateOrUpdate(string stream, ConsumerConfig config)
     {
         if (string.IsNullOrWhiteSpace(config.DurableName))
-            return JetStreamApiResponse.ErrorResponse(400, "durable name required");
+        {
+            if (config.Ephemeral)
+                config.DurableName = $"ephemeral-{Guid.NewGuid():N}"[..24];
+            else
+                return JetStreamApiResponse.ErrorResponse(400, "durable name required");
+        }
+
+        if (config.FilterSubjects.Count == 0 && !string.IsNullOrWhiteSpace(config.FilterSubject))
+            config.FilterSubjects.Add(config.FilterSubject);
 
         var key = (stream, config.DurableName);
         var handle = _consumers.AddOrUpdate(key,
@@ -129,7 +138,15 @@ public sealed class ConsumerManager
     public void OnPublished(string stream, StoredMessage message)
     {
         foreach (var handle in _consumers.Values.Where(c => c.Stream == stream && c.Config.Push))
+        {
+            if (!MatchesFilter(handle.Config, message.Subject))
+                continue;
+
+            if (handle.Config.MaxAckPending > 0 && handle.AckProcessor.PendingCount >= handle.Config.MaxAckPending)
+                continue;
+
             _pushConsumerEngine.Enqueue(handle, message);
+        }
     }
 
     public PushFrame? ReadPushFrame(string stream, string durableName)
@@ -142,6 +159,17 @@ public sealed class ConsumerManager
 
         return consumer.PushFrames.Dequeue();
     }
+
+    private static bool MatchesFilter(ConsumerConfig config, string subject)
+    {
+        if (config.FilterSubjects.Count > 0)
+            return config.FilterSubjects.Any(f => SubjectMatch.MatchLiteral(subject, f));
+
+        if (!string.IsNullOrWhiteSpace(config.FilterSubject))
+            return SubjectMatch.MatchLiteral(subject, config.FilterSubject);
+
+        return true;
+    }
 }
 
 public sealed record ConsumerHandle(string Stream, ConsumerConfig Config)