Changed various locking mechanism.

Services/ChannelManager.cs

@@ -14,7 +14,7 @@ namespace HermesSocketServer.Services
         private readonly ServerConfiguration _configuration;
         private readonly Serilog.ILogger _logger;
         private readonly IDictionary<string, Channel> _channels;
-        private readonly object _lock;
+        private readonly Mutex _mutex;
 
         public ChannelManager(IStore<string, User> users, Database database, IStore<string, TTSVoice> voices, ServerConfiguration configuration, Serilog.ILogger logger)
         {
@@ -24,7 +24,7 @@ namespace HermesSocketServer.Services
             _configuration = configuration;
             _logger = logger;
             _channels = new ConcurrentDictionary<string, Channel>();
-            _lock = new object();
+            _mutex = new Mutex();
         }
 
 
@@ -36,15 +36,16 @@ namespace HermesSocketServer.Services
 
             return await Task.Run(() =>
             {
-                lock (_lock)
+                try
                 {
+                    _mutex.WaitOne();
                     if (_channels.TryGetValue(userId, out var channel))
-                        return Task.FromResult<Channel?>(channel);
+                        return channel;
 
                     var actionTable = _configuration.Database.Tables["Action"];
                     var chatterTable = _configuration.Database.Tables["Chatter"];
                     var connectionTable = _configuration.Database.Tables["Connection"];
-                    //var chatterGroupTable = _configuration.Database.Tables["ChatterGroup"];
+                    var connectionStateTable = _configuration.Database.Tables["ConnectionState"];
                     var groupTable = _configuration.Database.Tables["Group"];
                     var groupPermissionTable = _configuration.Database.Tables["GroupPermission"];
                     var policyTable = _configuration.Database.Tables["Policy"];
@@ -93,22 +94,43 @@ namespace HermesSocketServer.Services
                     ]);
 
                     _channels.Add(userId, channel);
-                    return Task.FromResult<Channel?>(channel);
+                    return channel;
+                }
+                finally
+                {
+                    _mutex.ReleaseMutex();
                 }
             });
         }
 
         public Channel? Get(string channelId)
         {
+            try
+            {
+                _mutex.WaitOne();
                 if (_channels.TryGetValue(channelId, out var channel))
                     return channel;
                 return null;
             }
+            finally
+            {
+                _mutex.ReleaseMutex();
+            }
+        }
 
         public async Task Save(string userId)
         {
-            if (!_channels.TryGetValue(userId, out var channel))
+            Channel? channel;
+            try
+            {
+                _mutex.WaitOne();
+                if (!_channels.TryGetValue(userId, out channel))
                     return;
+            }
+            finally
+            {
+                _mutex.ReleaseMutex();
+            }
 
             _logger.Debug($"Saving channel data to database [channel id: {channel.Id}][channel name: {channel.User.Name}]");
             await Task.WhenAll([

Socket/Handlers/ChatterHandler.cs

@@ -14,7 +14,7 @@ namespace HermesSocketServer.Socket.Handlers
         private readonly long[] _array;
         private readonly ILogger _logger;
 
-        private readonly object _lock;
+        private readonly Mutex _lock;
         private int _index;
 
         public ChatterHandler(Database database, ILogger logger)
@@ -24,7 +24,7 @@ namespace HermesSocketServer.Socket.Handlers
             _chatters = new HashSet<long>(CHATTER_BUFFER_SIZE);
             _array = new long[CHATTER_BUFFER_SIZE];
             _index = -1;
-            _lock = new object();
+            _lock = new Mutex();
         }
 
         public async Task Execute<T>(WebSocketUser sender, T message, HermesSocketManager sockets)
@@ -32,8 +32,9 @@ namespace HermesSocketServer.Socket.Handlers
             if (message is not ChatterMessage data || sender.Id == null)
                 return;
 
-            lock (_lock)
+            try
             {
+                _lock.WaitOne();
                 if (_chatters.Contains(data.Id))
                     return;
 
@@ -43,11 +44,16 @@ namespace HermesSocketServer.Socket.Handlers
                     _index = -1;
 
                 var previous = _array[++_index];
-                if (previous != 0) {
+                if (previous != 0)
+                {
                     _chatters.Remove(previous);
                 }
                 _array[_index] = data.Id;
             }
+            finally
+            {
+                _lock.ReleaseMutex();
+            }
 
             try
             {

Socket/Handlers/EmoteDetailsHandler.cs

@@ -14,7 +14,7 @@ namespace HermesSocketServer.Socket.Handlers
         private readonly HashSet<string> _emotes;
         private readonly string[] _array;
         private readonly ILogger _logger;
-        private readonly object _lock;
+        private readonly Mutex _mutex;
 
         private int _index;
 
@@ -24,7 +24,7 @@ namespace HermesSocketServer.Socket.Handlers
             _emotes = new HashSet<string>(EMOTE_BUFFER_SIZE);
             _array = new string[EMOTE_BUFFER_SIZE];
             _logger = logger;
-            _lock = new object();
+            _mutex = new Mutex();
             _index = -1;
         }
 
@@ -36,8 +36,9 @@ namespace HermesSocketServer.Socket.Handlers
             if (data.Emotes == null || !data.Emotes.Any())
                 return;
 
-            lock (_lock)
+            try
             {
+                _mutex.WaitOne();
                 foreach (var entry in data.Emotes)
                 {
                     if (_emotes.Contains(entry.Key))
@@ -59,6 +60,10 @@ namespace HermesSocketServer.Socket.Handlers
                     _array[_index] = entry.Key;
                 }
             }
+            finally
+            {
+                _mutex.ReleaseMutex();
+            }
 
             if (!data.Emotes.Any())
                 return;

Socket/Handlers/EmoteUsageHandler.cs

@@ -13,7 +13,7 @@ namespace HermesSocketServer.Socket.Handlers
         private readonly HashSet<string> _history;
         private readonly EmoteUsageMessage[] _array;
         private readonly ILogger _logger;
-        private readonly object _lock;
+        private readonly Mutex _mutex;
 
         private int _index;
 
@@ -21,9 +21,9 @@ namespace HermesSocketServer.Socket.Handlers
         {
             _database = database;
             _logger = logger;
-            _history = new HashSet<string>(101);
+            _history = new HashSet<string>(1001);
-            _array = new EmoteUsageMessage[100];
+            _array = new EmoteUsageMessage[1000];
-            _lock = new object();
+            _mutex = new Mutex();
             _index = -1;
         }
 
@@ -33,7 +33,7 @@ namespace HermesSocketServer.Socket.Handlers
             if (message is not EmoteUsageMessage data || sender.Id == null)
                 return;
 
-            lock (_lock)
+            try
             {
                 if (_history.Contains(data.MessageId))
                 {
@@ -50,6 +50,10 @@ namespace HermesSocketServer.Socket.Handlers
 
                 _array[_index] = data;
             }
+            finally
+            {
+                _mutex.ReleaseMutex();
+            }
 
             int rows = 0;
             string sql = "INSERT INTO \"EmoteUsageHistory\" (timestamp, \"broadcasterId\", \"emoteId\", \"chatterId\") VALUES (@time, @broadcaster, @emote, @chatter)";

Socket/Handlers/HermesLoginHandler.cs

@@ -17,7 +17,7 @@ namespace HermesSocketServer.Socket.Handlers
         private readonly Database _database;
         private readonly HermesSocketManager _sockets;
         private readonly ILogger _logger;
-        private readonly object _lock;
+        private readonly SemaphoreSlim _semaphore;
 
         public HermesLoginHandler(ChannelManager manager, IStore<string, TTSVoice> voices, ServerConfiguration configuration, Database database, HermesSocketManager sockets, ILogger logger)
         {
@@ -27,7 +27,7 @@ namespace HermesSocketServer.Socket.Handlers
             _database = database;
             _sockets = sockets;
             _logger = logger;
-            _lock = new object();
+            _semaphore = new SemaphoreSlim(1);
         }
 
 
@@ -46,15 +46,15 @@ namespace HermesSocketServer.Socket.Handlers
                 return;
 
             IEnumerable<WebSocketUser?> recipients = Enumerable.Empty<WebSocketUser?>();
-            lock (_lock)
+            try
             {
+                await _semaphore.WaitAsync();
                 if (sender.Id != null)
                     return;
 
                 sender.Id = userId;
-                recipients = _sockets.GetSockets(userId).ToList().Where(s => s.SessionId != sender.SessionId);
                 sender.Slave = data.WebLogin || recipients.Where(r => r != null && !r.WebLogin).Any();
-            }
+                recipients = _sockets.GetSockets(userId).ToList().Where(s => s.SessionId != sender.SessionId);
 
                 sender.ApiKey = data.ApiKey;
                 sender.WebLogin = data.WebLogin;
@@ -131,5 +131,10 @@ namespace HermesSocketServer.Socket.Handlers
                 }
                 await Task.WhenAll(tasks);
             }
+            finally
+            {
+                _semaphore.Release();
+            }
+        }
     }
 }

Store/ChatterGroupStore.cs

@@ -30,7 +30,8 @@ namespace HermesSocketServer.Store
             await _database.Execute(sql, data, (reader) =>
             {
                 var chatterId = reader.GetInt32(0).ToString();
-                lock (_lock)
+                _rwls.EnterWriteLock();
+                try
                 {
                     _store.Add(chatterId, new GroupChatter()
                     {
@@ -40,6 +41,10 @@ namespace HermesSocketServer.Store
                         ChatterLabel = reader.GetString(1),
                     });
                 }
+                finally
+                {
+                    _rwls.ExitWriteLock();
+                }
             });
             _logger.Information($"Loaded {_store.Count} group chatters from database [group id: {_groupId}]");
         }

Store/IStore.cs

@@ -2,6 +2,7 @@ namespace HermesSocketServer.Store
 {
     public interface IStore<K, V>
     {
+        bool Exists(K key);
         V? Get(K key);
         IDictionary<K, V> Get();
         Task Load();

Store/Internal/AutoSavedStore.cs

@@ -46,14 +46,27 @@ namespace HermesSocketServer.Store.Internal
         private async Task GenerateQuery(IList<K> keys, Func<int, string> generate, Func<string, IEnumerable<K>, IEnumerable<V>, Task<int>> execute)
         {
             ImmutableList<K>? list = null;
-            lock (_lock)
+            _rwls.EnterUpgradeableReadLock();
+            try
             {
                 if (!keys.Any())
                     return;
 
+                _rwls.EnterWriteLock();
+                try
+                {
                     list = keys.ToImmutableList();
                     keys.Clear();
                 }
+                finally
+                {
+                    _rwls.ExitWriteLock();
+                }
+            }
+            finally
+            {
+                _rwls.ExitUpgradeableReadLock();
+            }
 
             var query = generate(list.Count);
             var values = list.Select(id => _store[id]).Where(v => v != null);

Store/Internal/ComplexAutoSavedStore.cs

@@ -51,14 +51,27 @@ namespace HermesSocketServer.Store.Internal
         private async Task GenerateQuery(IList<K> keys, Func<int, string> generate, Func<string, IEnumerable<K>, IEnumerable<V?>, Task<int>> execute)
         {
             ImmutableList<K>? list = null;
-            lock (_lock)
+            _rwls.EnterUpgradeableReadLock();
+            try
             {
                 if (!keys.Any())
                     return;
 
+                _rwls.EnterWriteLock();
+                try
+                {
                     list = keys.ToImmutableList();
                     keys.Clear();
                 }
+                finally
+                {
+                    _rwls.ExitWriteLock();
+                }
+            }
+            finally
+            {
+                _rwls.ExitUpgradeableReadLock();
+            }
 
             var query = generate(list.Count);
             var values = list.Select(id => _store[id]).Where(v => v != null);
@@ -77,17 +90,28 @@ namespace HermesSocketServer.Store.Internal
         private async Task GenerateDeleteQuery(IList<K> keys, IList<V> values, Func<int, string> generate, Func<string, IEnumerable<V>, Task<int>> execute)
         {
             ImmutableList<V>? list = null;
-            lock (_lock)
+            _rwls.EnterUpgradeableReadLock();
+            try
             {
                 if (!keys.Any() || !values.Any())
-                {
                     return;
-                }
 
+                _rwls.EnterWriteLock();
+                try
+                {
                     list = values.ToImmutableList();
                     values.Clear();
                     keys.Clear();
                 }
+                finally
+                {
+                    _rwls.ExitWriteLock();
+                }
+            }
+            finally
+            {
+                _rwls.ExitUpgradeableReadLock();
+            }
 
             var query = generate(list.Count);
             int rowsAffected = await execute(query, list);

Store/Internal/GroupedSaveStore.cs

@@ -10,7 +10,7 @@ namespace HermesSocketServer.Store.Internal
         protected readonly IList<K> _added;
         protected readonly IList<K> _modified;
         protected readonly IList<K> _deleted;
-        protected readonly object _lock;
+        protected readonly ReaderWriterLockSlim _rwls;
 
 
         public GroupSaveStore()
@@ -19,7 +19,7 @@ namespace HermesSocketServer.Store.Internal
             _added = new List<K>();
             _modified = new List<K>();
             _deleted = new List<K>();
-            _lock = new object();
+            _rwls = new ReaderWriterLockSlim();
         }
 
         public abstract Task Load();
@@ -28,22 +28,46 @@ namespace HermesSocketServer.Store.Internal
         protected abstract void OnPostRemove(K key, V value);
         public abstract Task Save();
 
+
+        public bool Exists(K key)
+        {
+            _rwls.EnterReadLock();
+            try
+            {
+                return _store.ContainsKey(key);
+            }
+            finally
+            {
+                _rwls.ExitReadLock();
+            }
+        }
+
         public V? Get(K key)
         {
-            lock (_lock)
+            _rwls.EnterReadLock();
+            try
             {
                 if (_store.TryGetValue(key, out var value))
                     return value;
             }
+            finally
+            {
+                _rwls.ExitReadLock();
+            }
             return null;
         }
 
         public IDictionary<K, V> Get()
         {
-            lock (_lock)
+            _rwls.EnterReadLock();
+            try
             {
                 return _store.ToImmutableDictionary();
             }
+            finally
+            {
+                _rwls.ExitReadLock();
+            }
         }
 
         public bool Modify(K? key, V value)
@@ -51,9 +75,13 @@ namespace HermesSocketServer.Store.Internal
             if (key == null)
                 return false;
 
-            lock (_lock)
+            _rwls.EnterUpgradeableReadLock();
+            try
             {
                 if (_store.TryGetValue(key, out V? oldValue))
+                {
+                    _rwls.EnterWriteLock();
+                    try
                     {
                         OnInitialModify(key, oldValue, value);
                         _store[key] = value;
@@ -63,6 +91,15 @@ namespace HermesSocketServer.Store.Internal
                         }
                         return true;
                     }
+                    finally
+                    {
+                        _rwls.ExitWriteLock();
+                    }
+                }
+            }
+            finally
+            {
+                _rwls.ExitUpgradeableReadLock();
             }
             return false;
         }
@@ -72,9 +109,13 @@ namespace HermesSocketServer.Store.Internal
             if (key == null)
                 return false;
 
-            lock (_lock)
+            _rwls.EnterUpgradeableReadLock();
+            try
             {
                 if (_store.TryGetValue(key, out V? value))
+                {
+                    _rwls.EnterWriteLock();
+                    try
                     {
                         modify(value);
                         if (!_added.Contains(key) && !_modified.Contains(key))
@@ -83,6 +124,15 @@ namespace HermesSocketServer.Store.Internal
                         }
                         return true;
                     }
+                    finally
+                    {
+                        _rwls.ExitWriteLock();
+                    }
+                }
+            }
+            finally
+            {
+                _rwls.ExitUpgradeableReadLock();
             }
             return false;
         }
@@ -92,12 +142,12 @@ namespace HermesSocketServer.Store.Internal
             if (key == null)
                 return false;
 
-            lock (_lock)
+            _rwls.EnterWriteLock();
+            try
             {
                 if (_store.TryGetValue(key, out var value))
                 {
-                    if (_store.Remove(key))
+                    _store.Remove(key);
-                    {
                     OnPostRemove(key, value);
                     if (!_added.Remove(key))
                     {
@@ -110,6 +160,9 @@ namespace HermesSocketServer.Store.Internal
                     return true;
                 }
             }
+            finally
+            {
+                _rwls.ExitWriteLock();
             }
             return false;
         }
@@ -119,11 +172,10 @@ namespace HermesSocketServer.Store.Internal
             if (key == null)
                 return false;
 
-            lock (_lock)
+            _rwls.EnterWriteLock();
+            try
             {
                 if (_store.TryGetValue(key, out V? fetched))
-                {
-                    if (fetched != value)
                 {
                     OnInitialModify(key, fetched, value);
                     _store[key] = value;
@@ -133,7 +185,6 @@ namespace HermesSocketServer.Store.Internal
                     }
                     return true;
                 }
-                }
                 else
                 {
                     OnInitialAdd(key, value);
@@ -145,7 +196,10 @@ namespace HermesSocketServer.Store.Internal
                     return true;
                 }
             }
-            return false;
+            finally
+            {
+                _rwls.ExitWriteLock();
+            }
         }
     }
 }