batch33 task4 implement group C cluster stream features

dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamEngine.cs

@@ -1421,6 +1421,270 @@ internal sealed class JetStreamEngine(JetStream state)
         if (!isLeader)
             stream.ResetClusteredState();
     }
+
+    internal StreamAssignment? StreamAssignment(string accountName, string streamName)
+    {
+        _state.Lock.EnterReadLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster)
+                return null;
+            if (!cluster.Streams.TryGetValue(accountName, out var accountStreams))
+                return null;
+            return accountStreams.TryGetValue(streamName, out var assignment) ? assignment : null;
+        }
+        finally
+        {
+            _state.Lock.ExitReadLock();
+        }
+    }
+
+    internal StreamAssignment? StreamAssignmentOrInflight(string accountName, string streamName)
+    {
+        _state.Lock.EnterReadLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster)
+                return null;
+            if (cluster.Streams.TryGetValue(accountName, out var accountStreams) &&
+                accountStreams.TryGetValue(streamName, out var current))
+                return current;
+
+            if (cluster.InflightStreams.TryGetValue(accountName, out var inflight) &&
+                inflight.TryGetValue(streamName, out var info))
+                return info.Assignment;
+
+            return null;
+        }
+        finally
+        {
+            _state.Lock.ExitReadLock();
+        }
+    }
+
+    internal IEnumerable<StreamAssignment> StreamAssignmentsOrInflightSeq(string accountName)
+    {
+        _state.Lock.EnterReadLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster)
+                return [];
+
+            var seen = new HashSet<string>(StringComparer.Ordinal);
+            var items = new List<StreamAssignment>();
+            if (cluster.Streams.TryGetValue(accountName, out var accountStreams))
+            {
+                foreach (var (streamName, assignment) in accountStreams)
+                {
+                    seen.Add(streamName);
+                    items.Add(assignment);
+                }
+            }
+
+            if (cluster.InflightStreams.TryGetValue(accountName, out var inflightStreams))
+            {
+                foreach (var (streamName, inflight) in inflightStreams)
+                {
+                    if (seen.Contains(streamName) || inflight.Assignment == null)
+                        continue;
+                    items.Add(inflight.Assignment);
+                }
+            }
+
+            return items;
+        }
+        finally
+        {
+            _state.Lock.ExitReadLock();
+        }
+    }
+
+    internal IEnumerable<(string Account, StreamAssignment Assignment)> StreamAssignmentsOrInflightSeqAllAccounts()
+    {
+        _state.Lock.EnterReadLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster)
+                return [];
+
+            var results = new List<(string Account, StreamAssignment Assignment)>();
+            foreach (var account in cluster.Streams.Keys.Union(cluster.InflightStreams.Keys, StringComparer.Ordinal))
+            {
+                var seen = new HashSet<string>(StringComparer.Ordinal);
+                if (cluster.Streams.TryGetValue(account, out var accountStreams))
+                {
+                    foreach (var (streamName, assignment) in accountStreams)
+                    {
+                        seen.Add(streamName);
+                        results.Add((account, assignment));
+                    }
+                }
+
+                if (cluster.InflightStreams.TryGetValue(account, out var inflightStreams))
+                {
+                    foreach (var (streamName, inflight) in inflightStreams)
+                    {
+                        if (seen.Contains(streamName) || inflight.Assignment == null)
+                            continue;
+                        results.Add((account, inflight.Assignment));
+                    }
+                }
+            }
+
+            return results;
+        }
+        finally
+        {
+            _state.Lock.ExitReadLock();
+        }
+    }
+
+    internal void ProcessStreamAssignment(StreamAssignment assignment)
+    {
+        _state.Lock.EnterWriteLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster || assignment.Client == null)
+                return;
+
+            var accountName = assignment.Client.ServiceAccount();
+            if (!cluster.Streams.TryGetValue(accountName, out var accountStreams))
+            {
+                accountStreams = new Dictionary<string, StreamAssignment>(StringComparer.Ordinal);
+                cluster.Streams[accountName] = accountStreams;
+            }
+
+            var streamName = assignment.Config?.Name ?? assignment.Subject ?? string.Empty;
+            assignment.Responded = true;
+            accountStreams[streamName] = assignment;
+            cluster.RemoveInflightStreamProposal(accountName, streamName);
+        }
+        finally
+        {
+            _state.Lock.ExitWriteLock();
+        }
+    }
+
+    internal void ProcessUpdateStreamAssignment(StreamAssignment assignment)
+    {
+        ProcessStreamAssignment(assignment);
+    }
+
+    internal void ProcessClusterUpdateStream(StreamAssignment assignment)
+    {
+        ProcessUpdateStreamAssignment(assignment);
+    }
+
+    internal void ProcessClusterCreateStream(StreamAssignment assignment)
+    {
+        ProcessStreamAssignment(assignment);
+    }
+
+    internal void ProcessStreamRemoval(StreamAssignment assignment)
+    {
+        _state.Lock.EnterWriteLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster || assignment.Client == null)
+                return;
+            var accountName = assignment.Client.ServiceAccount();
+            var streamName = assignment.Config?.Name ?? assignment.Subject ?? string.Empty;
+            if (cluster.Streams.TryGetValue(accountName, out var accountStreams))
+            {
+                accountStreams.Remove(streamName);
+                if (accountStreams.Count == 0)
+                    cluster.Streams.Remove(accountName);
+            }
+            cluster.RemoveInflightStreamProposal(accountName, streamName);
+        }
+        finally
+        {
+            _state.Lock.ExitWriteLock();
+        }
+    }
+
+    internal void ProcessClusterDeleteStream(StreamAssignment assignment)
+    {
+        ProcessStreamRemoval(assignment);
+    }
+
+    internal void ProcessConsumerAssignment(ConsumerAssignment assignment)
+    {
+        _state.Lock.EnterWriteLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster || assignment.Client == null)
+                return;
+
+            var accountName = assignment.Client.ServiceAccount();
+            if (!cluster.Streams.TryGetValue(accountName, out var accountStreams))
+                return;
+            if (!accountStreams.TryGetValue(assignment.Stream, out var streamAssignment))
+                return;
+
+            streamAssignment.Consumers ??= new Dictionary<string, ConsumerAssignment>(StringComparer.Ordinal);
+            assignment.Responded = true;
+            streamAssignment.Consumers[assignment.Name] = assignment;
+            cluster.RemoveInflightConsumerProposal(accountName, assignment.Stream, assignment.Name);
+        }
+        finally
+        {
+            _state.Lock.ExitWriteLock();
+        }
+    }
+
+    internal void ProcessConsumerRemoval(ConsumerAssignment assignment)
+    {
+        _state.Lock.EnterWriteLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster || assignment.Client == null)
+                return;
+
+            var accountName = assignment.Client.ServiceAccount();
+            if (cluster.Streams.TryGetValue(accountName, out var accountStreams) &&
+                accountStreams.TryGetValue(assignment.Stream, out var streamAssignment))
+            {
+                streamAssignment.Consumers?.Remove(assignment.Name);
+            }
+            cluster.RemoveInflightConsumerProposal(accountName, assignment.Stream, assignment.Name);
+        }
+        finally
+        {
+            _state.Lock.ExitWriteLock();
+        }
+    }
+
+    internal void ProcessClusterCreateConsumer(ConsumerAssignment assignment)
+    {
+        ProcessConsumerAssignment(assignment);
+    }
+
+    internal void ProcessClusterDeleteConsumer(ConsumerAssignment assignment)
+    {
+        ProcessConsumerRemoval(assignment);
+    }
+
+    internal ConsumerAssignment? ConsumerAssignment(string accountName, string streamName, string consumerName)
+    {
+        _state.Lock.EnterReadLock();
+        try
+        {
+            if (_state.Cluster is not JetStreamCluster cluster)
+                return null;
+            if (!cluster.Streams.TryGetValue(accountName, out var accountStreams))
+                return null;
+            if (!accountStreams.TryGetValue(streamName, out var streamAssignment))
+                return null;
+            if (streamAssignment.Consumers == null)
+                return null;
+            return streamAssignment.Consumers.TryGetValue(consumerName, out var assignment) ? assignment : null;
+        }
+        finally
+        {
+            _state.Lock.ExitReadLock();
+        }
+    }
 }
 
 internal sealed class StreamAssignmentView

dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.JetStreamClusterStreams.cs

@@ -9,4 +9,30 @@ public sealed partial class NatsServer
 
         return Math.Max(1, config.Replicas);
     }
+
+    internal void SendStreamLostQuorumAdvisory(Account? account, string stream, string[]? peers = null)
+    {
+        _ = account;
+        _ = peers;
+        Noticef("JetStream stream lost quorum advisory for stream {0}", stream);
+    }
+
+    internal void SendStreamLeaderElectAdvisory(Account? account, string stream, string leader)
+    {
+        _ = account;
+        Noticef("JetStream stream leader elect advisory for stream {0}, leader {1}", stream, leader);
+    }
+
+    internal bool RemoveStream(Account? account, string streamName)
+    {
+        if (account == null)
+            return false;
+
+        var (stream, _) = account.LookupStream(streamName);
+        if (stream == null)
+            return false;
+
+        stream.Delete();
+        return true;
+    }
 }