#66 Kick client if server leaves/crashes.

src/MultiplayerMod.Test/Multiplayer/MultiplayerConnectionTests.cs

@@ -132,7 +132,7 @@ private static void PlayerConnectedAndDisconnected(bool gracefully) {
         clientRuntime.Activate();
 
         if (gracefully) {
-            clientRuntime.EventDispatcher().Dispatch(new GameQuitEvent(clientRuntime.Multiplayer()));
+            clientRuntime.EventDispatcher().Dispatch(new GameQuitEvent());
             Assert.AreEqual(expected: 0, clientRuntime.Multiplayer().Players.Count());
         } else {
             clientRuntime.Dependencies.Get<IMultiplayerClient>().Disconnect();

src/MultiplayerMod/Multiplayer/CoreOperations/Binders/HostEventsBinder.cs

@@ -34,7 +34,7 @@ private void Bind() {
         log.Debug("Binding host events");
 
         eventDispatcher.Subscribe<GameStartedEvent>(OnGameStarted);
-        eventDispatcher.Subscribe<GameQuitEvent>(OnGameQuit);
+        eventDispatcher.Subscribe<StopMultiplayerEvent>(OnStopMultiplayer);
 
         ChoreConsumerEvents.FindNextChore += p => server.Send(new FindNextChore(p), MultiplayerCommandOptions.SkipHost);
     }
@@ -51,7 +51,7 @@ private void OnGameStarted(GameStartedEvent @event) {
         };
     }
 
-    private void OnGameQuit(GameQuitEvent @event) {
+    private void OnStopMultiplayer(StopMultiplayerEvent @event) {
         if (@event.Multiplayer.Mode != MultiplayerMode.Host)
             return;
 

src/MultiplayerMod/Multiplayer/CoreOperations/Events/ConnectionLostEvent.cs

@@ -0,0 +1,5 @@
+using MultiplayerMod.Core.Events;
+
+namespace MultiplayerMod.Multiplayer.CoreOperations.Events;
+
+public record ConnectionLostEvent : IDispatchableEvent;

src/MultiplayerMod/Multiplayer/CoreOperations/Events/GameQuitEvent.cs

@@ -2,4 +2,4 @@
 
 namespace MultiplayerMod.Multiplayer.CoreOperations.Events;
 
-public record GameQuitEvent(MultiplayerGame Multiplayer) : IDispatchableEvent;
+public record GameQuitEvent : IDispatchableEvent;

src/MultiplayerMod/Multiplayer/CoreOperations/Events/StopMultiplayerEvent.cs

@@ -0,0 +1,5 @@
+using MultiplayerMod.Core.Events;
+
+namespace MultiplayerMod.Multiplayer.CoreOperations.Events;
+
+public record StopMultiplayerEvent(MultiplayerGame Multiplayer) : IDispatchableEvent;

src/MultiplayerMod/Multiplayer/CoreOperations/ExecutionLevelController.cs

@@ -25,7 +25,7 @@ MultiplayerGame multiplayer
         eventDispatcher.Subscribe<SinglePlayerModeSelectedEvent>(OnSinglePlayerModeSelected);
         eventDispatcher.Subscribe<MultiplayerModeSelectedEvent>(OnMultiplayerModeSelected);
         eventDispatcher.Subscribe<PlayerStateChangedEvent>(OnPlayerStateChangedEvent);
-        eventDispatcher.Subscribe<GameQuitEvent>(OnGameQuit);
+        eventDispatcher.Subscribe<StopMultiplayerEvent>(OnStopMultiplayer);
     }
 
     private void OnSinglePlayerModeSelected(SinglePlayerModeSelectedEvent @event) {
@@ -41,7 +41,7 @@ private void OnPlayerStateChangedEvent(PlayerStateChangedEvent @event) {
             executionLevelManager.BaseLevel = ExecutionLevel.Game;
     }
 
-    private void OnGameQuit(GameQuitEvent _) {
+    private void OnStopMultiplayer(StopMultiplayerEvent _) {
         executionLevelManager.BaseLevel = ExecutionLevel.System;
     }
 

src/MultiplayerMod/Multiplayer/CoreOperations/GameStateEventsRelay.cs

@@ -28,7 +28,7 @@ public GameStateEventsRelay(EventDispatcher events, MultiplayerGame multiplayer,
 
     private void OnWorldSave() => events.Dispatch(new WorldSavedEvent());
 
-    private void OnGameQuit() => events.Dispatch(new GameQuitEvent(multiplayer));
+    private void OnGameQuit() => events.Dispatch(new GameQuitEvent());
 
     private void OnGameStarted() => scheduler.Run(() => events.Dispatch(new GameStartedEvent(multiplayer)));
 

src/MultiplayerMod/Multiplayer/CoreOperations/MultiplayerServerController.cs

@@ -21,7 +21,7 @@ public MultiplayerServerController(IMultiplayerServer server, IMultiplayerClient
         this.events = events;
 
         events.Subscribe<GameStartedEvent>(OnGameStarted);
-        events.Subscribe<GameQuitEvent>(OnGameQuit);
+        events.Subscribe<StopMultiplayerEvent>(OnStopMultiplayer);
 
         server.StateChanged += OnServerStateChanged;
     }
@@ -46,7 +46,7 @@ private void OnGameStarted(GameStartedEvent @event) {
         server.Start();
     }
 
-    private void OnGameQuit(GameQuitEvent @event) {
+    private void OnStopMultiplayer(StopMultiplayerEvent @event) {
         if (@event.Multiplayer.Mode != MultiplayerMode.Host)
             return;
 

src/MultiplayerMod/Multiplayer/CoreOperations/PlayersManagement/PlayersManagementController.cs

@@ -22,6 +22,8 @@ public class PlayersManagementController {
     private readonly IMultiplayerServer server;
     private readonly IMultiplayerClient client;
 
+    private readonly EventDispatcher events;
+
     private readonly WorldManager worldManager;
     private readonly MultiplayerGame multiplayer;
     private readonly UnityTaskScheduler scheduler;
@@ -39,19 +41,21 @@ public PlayersManagementController(
         MultiplayerGame multiplayer,
         UnityTaskScheduler scheduler
     ) {
-        this.client = client;
-        this.profileProvider = profileProvider;
         this.server = server;
+        this.client = client;
+        this.events = events;
         this.worldManager = worldManager;
         this.multiplayer = multiplayer;
         this.scheduler = scheduler;
+        this.profileProvider = profileProvider;
 
         server.ClientDisconnected += OnClientDisconnected;
         events.Subscribe<ClientInitializationRequestEvent>(OnClientInitializationRequested);
 
         client.StateChanged += OnClientStateChanged;
         events.Subscribe<GameStartedEvent>(OnGameStarted);
         events.Subscribe<GameQuitEvent>(OnGameQuit);
+        events.Subscribe<StopMultiplayerEvent>(OnStopMultiplayer);
         events.Subscribe<CurrentPlayerInitializedEvent>(OnCurrentPlayerInitialized);
         events.Subscribe<WorldSyncRequestedEvent>(OnWorldSaveRequested);
     }
@@ -65,10 +69,12 @@ private void OnCurrentPlayerInitialized(CurrentPlayerInitializedEvent @event) {
     }
 
     private void OnClientStateChanged(MultiplayerClientState state) {
-        if (state != MultiplayerClientState.Connected)
-            return;
-
-        client.Send(new InitializeClientCommand(profileProvider.GetPlayerProfile()));
+        if (state == MultiplayerClientState.Connected)
+            client.Send(new InitializeClientCommand(profileProvider.GetPlayerProfile()));
+        if (state == MultiplayerClientState.Error) {
+            events.Dispatch(new StopMultiplayerEvent(multiplayer));
+            events.Dispatch(new ConnectionLostEvent());
+        }
     }
 
     private void OnGameStarted(GameStartedEvent @event) {
@@ -81,6 +87,10 @@ private void OnGameStarted(GameStartedEvent @event) {
 
     private void OnGameQuit(GameQuitEvent @event) {
         client.Send(new RequestPlayerStateChangeCommand(multiplayer.Players.Current.Id, PlayerState.Leaving));
+        events.Dispatch(new StopMultiplayerEvent(multiplayer));
+    }
+
+    private void OnStopMultiplayer(StopMultiplayerEvent @event) {
         client.Disconnect();
         multiplayer.Players.Synchronize(Array.Empty<MultiplayerPlayer>());
     }

src/MultiplayerMod/Multiplayer/UI/Notifications.cs

@@ -0,0 +1,27 @@
+using JetBrains.Annotations;
+using MultiplayerMod.Core.Dependency;
+using MultiplayerMod.Core.Events;
+using MultiplayerMod.Multiplayer.CoreOperations.Events;
+
+namespace MultiplayerMod.Multiplayer.UI;
+
+[Dependency, UsedImplicitly]
+public class Notifications {
+
+    public Notifications(EventDispatcher events) {
+        events.Subscribe<ConnectionLostEvent>(OnConnectionLost);
+    }
+
+    private void OnConnectionLost(ConnectionLostEvent @event) {
+        var screen = (InfoDialogScreen) GameScreenManager.Instance.StartScreen(
+            ScreenPrefabs.Instance.InfoDialogScreen.gameObject,
+            GameScreenManager.Instance.ssOverlayCanvas.gameObject
+        );
+        screen.SetHeader("Multiplayer");
+        screen.AddPlainText("Connection has been lost. Further play can not be synced");
+        screen.AddOption(
+            "OK",
+            _ => PauseScreen.Instance.OnQuitConfirm()
+        );
+    }
+}

src/MultiplayerMod/Platform/Steam/Network/SteamClient.cs

@@ -64,7 +64,7 @@ public void Connect(IMultiplayerEndpoint endpoint) {
     }
 
     public void Disconnect() {
-        if (State <= MultiplayerClientState.Disconnected)
+        if (State == MultiplayerClientState.Disconnected)
             throw new NetworkPlatformException("Client not connected");
 
         UnityObject.Destroy(gameObject);
@@ -96,8 +96,10 @@ public void Send(IMultiplayerCommand command, MultiplayerCommandOptions options
                     k_nSteamNetworkingSend_Reliable,
                     out var messageOut
                 );
-                if (result != EResult.k_EResultOK && messageOut == 0)
+                if (result != EResult.k_EResultOK || messageOut == 0) {
                     log.Error($"Failed to send {command}: {result}");
+                    SetState(MultiplayerClientState.Error);
+                }
             }
         );
     }