* LCRTMRouter.cs:

* LCRTMServer.cs:
* LCWebSocketConnection.cs:

* LCIMClient.cs: chore: 基础断线重连功能

Realtime/Internal/Router/LCRTMRouter.cs

@@ -12,11 +12,11 @@ namespace LeanCloud.Realtime.Internal.Router {
         internal LCRTMRouter() {
         }
 
-        internal async Task<string> GetServer() {
+        internal async Task<LCRTMServer> GetServer() {
             if (rtmServer == null || !rtmServer.IsValid) {
                 await Fetch();
             }
-            return rtmServer.Server;
+            return rtmServer;
         }
 
         internal void Reset() {

Realtime/Internal/Router/LCRTMServer.cs

@@ -14,7 +14,7 @@ namespace LeanCloud.Realtime.Internal.Router {
         }
 
         [JsonProperty("server")]
-        internal string Server {
+        internal string Primary {
             get; set;
         }
 

Realtime/Internal/WebSocket/LCWebSocketConnection.cs

@@ -10,7 +10,7 @@ using Google.Protobuf;
 
 namespace LeanCloud.Realtime.Internal.WebSocket {
     internal class LCWebSocketConnection {
-        private const int KEEP_ALIVE_INTERVAL = 10;
+        private const int KEEP_ALIVE_INTERVAL = 1;
         // .net standard 2.0 好像在拼合 Frame 时有 bug，所以将这个值调整大一些
         private const int RECV_BUFFER_SIZE = 1024 * 5;
 
@@ -32,7 +32,11 @@ namespace LeanCloud.Realtime.Internal.WebSocket {
             get; set;
         }
 
-        internal Action<int, string> OnClose {
+        internal Action<int, string> OnDisconnect {
+            get; set;
+        }
+
+        internal Func<Task> OnReconnect {
             get; set;
         }
 
@@ -44,13 +48,42 @@ namespace LeanCloud.Realtime.Internal.WebSocket {
         }
 
         internal async Task Connect() {
-            string rtmServer = await Router.GetServer();
+            // TODO 可完善策略
+            LCRTMServer rtmServer = await Router.GetServer();
+            try {
+                LCLogger.Debug($"Connect Primary Server: {rtmServer.Primary}");
+                await Connect(rtmServer.Primary);
+                LCLogger.Debug("Connected Primary Server");
+            } catch (Exception e) {
+                LCLogger.Error(e.Message);
+                LCLogger.Debug($"Connect Secondary Server: {rtmServer.Secondary}");
+                await Connect(rtmServer.Secondary);
+                LCLogger.Debug($"Connected Secondary Server");
+            }
+            
+            // 接收
+            _ = StartReceive();
+        }
 
+        private async Task Connect(string server) {
             ws = new ClientWebSocket();
             ws.Options.AddSubProtocol("lc.protobuf2.3");
             ws.Options.KeepAliveInterval = TimeSpan.FromSeconds(KEEP_ALIVE_INTERVAL);
-            await ws.ConnectAsync(new Uri(rtmServer), default);
+            await ws.ConnectAsync(new Uri(server), default);
-            _ = StartReceive();
+        }
+
+        private async Task Reconnect() {
+            // TODO 重连策略
+            while (true) {
+                try {
+                    await Connect();
+                    break;
+                } catch (Exception e) {
+                    LCLogger.Error(e.Message);
+                    await Task.Delay(1000 * 10);
+                }
+            }
+            OnReconnect?.Invoke();
         }
 
         internal Task<GenericCommand> SendRequest(GenericCommand request) {
@@ -61,9 +94,9 @@ namespace LeanCloud.Realtime.Internal.WebSocket {
             ArraySegment<byte> bytes = new ArraySegment<byte>(request.ToByteArray());
             try {
                 ws.SendAsync(bytes, WebSocketMessageType.Binary, true, default);
-            } catch (Exception) {
+            } catch (Exception e) {
                 // TODO 发送消息异常
-
+                LCLogger.Error(e.Message);
             }
             return tcs.Task;
         }
@@ -81,7 +114,13 @@ namespace LeanCloud.Realtime.Internal.WebSocket {
                     do {
                         result = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), default);
                         if (result.MessageType == WebSocketMessageType.Close) {
-                            OnClose?.Invoke(-1, null);
+                            LCLogger.Debug($"Receive Closed: {result.CloseStatusDescription}");
+                            try {
+                                await ws.CloseAsync(WebSocketCloseStatus.NormalClosure, "", default);
+                            } catch (Exception ex) {
+                                LCLogger.Error(ex.Message);
+                            }
+                            OnDisconnect?.Invoke(-1, null);
                             return;
                         }
                         // 拼合 WebSocket Frame
@@ -99,10 +138,18 @@ namespace LeanCloud.Realtime.Internal.WebSocket {
                         LCLogger.Error(e.Message);
                     }
                 }
-            } catch (Exception e) {
+            } catch (WebSocketException e) {
-                // 连接断开
                 LCLogger.Error(e.Message);
-                await ws.CloseAsync(WebSocketCloseStatus.EndpointUnavailable, "read error", default);
+                LCLogger.Debug($"WebSocket State: {ws.State}");
+                try {
+                    ws.Abort();
+                    ws.Dispose();
+                } catch (Exception ex) {
+                    LCLogger.Error(ex.Message);
+                } finally {
+                    // 触发重连
+                    await Reconnect();
+                }
             }
         }
 

Realtime/LCIMClient.cs

@@ -224,7 +224,9 @@ namespace LeanCloud.Realtime {
             GoAwayController = new LCIMGoAwayController(this);
 
             Connection = new LCWebSocketConnection(Id) {
-                OnNotification = OnNotification
+                OnNotification = OnNotification,
+                OnDisconnect = OnDisconnect,
+                OnReconnect = OnReconnect
             };
         }
 
@@ -387,6 +389,11 @@ namespace LeanCloud.Realtime {
             }
         }
 
+        private async Task OnReconnect() {
+            // 打开 Session
+            await SessionController.Open();
+        }
+
         internal async Task<LCIMConversation> GetOrQueryConversation(string convId) {
             if (ConversationDict.TryGetValue(convId, out LCIMConversation conversation)) {
                 return conversation;