Notify observer to complete async stream on network error.

src/StrawberryShake/Client/src/Transport.WebSockets/ISocketClient.cs

@@ -11,6 +11,11 @@ namespace StrawberryShake.Transport.WebSockets;
 /// </summary>
 public interface ISocketClient : IAsyncDisposable
 {
+    /// <summary>
+    ///  A even that is called when the message receiving cycle stoped
+    /// </summary>
+    event EventHandler ReceiveFinished;
+
     /// <summary>
     /// The URI where the socket should connect to
     /// </summary>
@@ -70,4 +75,4 @@ Task CloseAsync(
         string message,
         SocketCloseStatus closeStatus,
         CancellationToken cancellationToken = default);
-}
+}

src/StrawberryShake/Client/src/Transport.WebSockets/ISocketOperation.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 using StrawberryShake.Transport.WebSockets.Messages;
 
 namespace StrawberryShake.Transport.WebSockets;
@@ -18,4 +20,13 @@ public interface ISocketOperation : IAsyncDisposable
     /// CReate an operation message stream.
     /// </summary>
     IAsyncEnumerable<OperationMessage> ReadAsync();
+
+    /// <summary>
+    /// Complete the operation
+    /// </summary>
+    /// <param name="cancellationToken">
+    /// A <see cref="CancellationToken"/> to cancel the completion
+    /// </param>
+    /// <returns>A task that is completed once the operation is completed</returns>
+    ValueTask CompleteAsync(CancellationToken cancellationToken);
 }

src/StrawberryShake/Client/src/Transport.WebSockets/ISocketProtocol.cs

@@ -88,4 +88,16 @@ Task StopOperationAsync(
     /// </summary>
     /// <param name="listener"></param>
     void Unsubscribe(OnReceiveAsync listener);
-}
+
+    /// <summary>
+    /// Notify the protocol to complete
+    /// </summary>
+    /// <param name="operationId">The id of the operation to stop</param>
+    /// <param name="cancellationToken">
+    /// A <see cref="CancellationToken"/> to cancel the notification
+    /// </param>
+    /// <returns>A task that is completed once the notification is completed</returns>
+    ValueTask NotifyCompletion(
+        string operationId,
+        CancellationToken cancellationToken);
+}

src/StrawberryShake/Client/src/Transport.WebSockets/Session.cs

@@ -24,6 +24,8 @@ public Session(ISocketClient socketClient)
     {
         _socketClient = socketClient ??
                         throw new ArgumentNullException(nameof(socketClient));
+
+        _socketClient.ReceiveFinished += ReceiveFinishHandler;
     }
 
     /// <inheritdoc />
@@ -93,6 +95,21 @@ await socketProtocol
         }
     }
 
+    /// <inheritdoc />
+    private async ValueTask CompleteOperation(CancellationToken cancellationToken)
+    {
+        foreach (var operation in _operations)
+        {
+            await operation.Value.CompleteAsync(cancellationToken);
+        }
+    }
+
+    /// <inheritdoc />
+    private void ReceiveFinishHandler(object? sender, EventArgs args)
+    {
+        _ = CompleteOperation(default);
+    }
+
     /// <summary>
     /// Opens a session over the socket
     /// </summary>
@@ -166,6 +183,7 @@ public async ValueTask DisposeAsync()
                 _operations.Clear();
             }
 
+            _socketClient.ReceiveFinished -= ReceiveFinishHandler;
             _socketProtocol?.Unsubscribe(ReceiveMessage);
             await _socketClient.DisposeAsync();
         }

src/StrawberryShake/Client/src/Transport.WebSockets/SocketOperation.cs

@@ -54,6 +54,22 @@ public SocketOperation(
     public IAsyncEnumerable<OperationMessage> ReadAsync()
         => new MessageStream(this, _channel);
 
+    /// <inheritdoc />
+    public async ValueTask CompleteAsync(CancellationToken cancellationToken)
+    {
+        if (!_disposed)
+        {
+            try
+            {
+                await _channel.Writer.WriteAsync(CompleteOperationMessage.Default, cancellationToken).ConfigureAwait(false);
+            }
+            catch (ChannelClosedException)
+            {
+                // if the channel is closed we will move on.
+            }
+        }
+    }
+
     private sealed class MessageStream : IAsyncEnumerable<OperationMessage>
     {
         private readonly SocketOperation _operation;
@@ -113,4 +129,4 @@ public async ValueTask DisposeAsync()
             _disposed = true;
         }
     }
-}
+}

src/StrawberryShake/Client/src/Transport.WebSockets/SocketProtocolBase.cs

@@ -65,6 +65,14 @@ protected async ValueTask Notify(
         }
     }
 
+    /// <inheritdoc />
+    public async ValueTask NotifyCompletion(
+    string operationId,
+    CancellationToken cancellationToken)
+    {
+        await Notify(operationId, CompleteOperationMessage.Default, cancellationToken).ConfigureAwait(false);
+    }
+
     /// <inheritdoc />
     public virtual ValueTask DisposeAsync()
     {
@@ -78,4 +86,4 @@ public virtual ValueTask DisposeAsync()
         _disposed = true;
         return default;
     }
-}
+}

src/StrawberryShake/Client/src/Transport.WebSockets/WebSocketClient.cs

@@ -19,8 +19,12 @@ public sealed class WebSocketClient : IWebSocketClient
     private readonly IReadOnlyList<ISocketProtocolFactory> _protocolFactories;
     private readonly ClientWebSocket _socket;
     private ISocketProtocol? _activeProtocol;
+    private bool _receiveFinishEventTriggered = false;
     private bool _disposed;
 
+    /// <inheritdoc />
+    public event EventHandler ReceiveFinished = default!;
+
     /// <summary>
     /// Creates a new instance of <see cref="WebSocketClient"/>
     /// </summary>
@@ -52,10 +56,22 @@ public WebSocketClient(
     public string Name { get; }
 
     /// <inheritdoc />
-    public bool IsClosed =>
-        _disposed
-        || _socket.CloseStatus.HasValue
-        || _socket.State == WebSocketState.Aborted;
+    public bool IsClosed
+    {
+        get
+        {
+            var closed = _disposed
+                || _socket.CloseStatus.HasValue
+                || _socket.State == WebSocketState.Aborted;
+
+            if (closed && !_receiveFinishEventTriggered)
+            {
+                _receiveFinishEventTriggered = true;
+                ReceiveFinished?.Invoke(this, EventArgs.Empty);
+            }
+            return closed;
+        }
+    }
 
     /// <inheritdoc />
     public WebSocket Socket => _socket;

src/StrawberryShake/Client/test/Transport.WebSocket.Tests/TestHelper/SocketClientStub.cs

@@ -17,6 +17,8 @@ public sealed class SocketClientStub : ISocketClient
         new(TaskCreationOptions.None);
     private bool _isClosed = true;
 
+    public event EventHandler ReceiveFinished = default!;
+
     public SemaphoreSlim Blocker { get; } = new(0);
 
     public Uri? Uri { get; set; }

src/StrawberryShake/CodeGeneration/test/CodeGeneration.CSharp.Tests/Integration/StarWarsOnReviewSubCompletionTest.cs

@@ -1,11 +1,14 @@
 using System;
+using System.Net.WebSockets;
+using System.Reflection;
 using System.Threading.Tasks;
 using HotChocolate.AspNetCore.Tests.Utilities;
 using HotChocolate.StarWars.Models;
 using HotChocolate.Subscriptions;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.DependencyInjection;
 using StrawberryShake.Transport.WebSockets;
+using StrawberryShake.Transport.WebSockets.Protocols;
 using Xunit;
 
 namespace StrawberryShake.CodeGeneration.CSharp.Integration.StarWarsOnReviewSubCompletion
@@ -63,11 +66,128 @@ public async Task Watch_StarWarsOnReviewSubCompletion_Test()
             {
                 await Task.Delay(1_000);
             }
+
+            // assert
+            Assert.True(commentary is not null && completionTriggered);
 
             session.Dispose();
+        }
+
+        [Fact]
+        public async Task Watch_StarWarsOnReviewSubCompletionPassively_Test()
+        {
+            // arrange
+            using IWebHost host = TestServerHelper.CreateServer(
+                _ => { },
+                out var port);
+            var topicEventSender = host.Services.GetRequiredService<ITopicEventSender>();
+
+            var serviceCollection = new ServiceCollection();
+            serviceCollection.AddStarWarsOnReviewSubCompletionClient(
+                profile: StarWarsOnReviewSubCompletionClientProfileKind.Default)
+                .ConfigureHttpClient(
+                    c => c.BaseAddress = new Uri("http://localhost:" + port + "/graphql"))
+                .ConfigureWebSocketClient(
+                    c => c.Uri = new Uri("ws://localhost:" + port + "/graphql"));
+
+            serviceCollection.AddSingleton<SubscriptionSocketStateMonitor>();
+
+            // act
+            IServiceProvider services = serviceCollection.BuildServiceProvider();
+            IStarWarsOnReviewSubCompletionClient client = services.GetRequiredService<IStarWarsOnReviewSubCompletionClient>();
+
+            string? commentary = null;
+            bool completionTriggered = false;
+
+            var sub = client.OnReviewSub.Watch();
+            var session = sub.Subscribe(
+                result => commentary = result.Data?.OnReview?.Commentary,
+                () => completionTriggered = true);
+
+            var topic = Episode.NewHope;
+
+            // try to send message 10 times
+            // make sure the subscription connection is successful
+            for (int times = 0; commentary is null && times < 10; times++)
+            {
+                await topicEventSender.SendAsync(topic, new Review { Stars = 1, Commentary = "Commentary" });
+                await Task.Delay(1_000);
+            }
+
+            // simulate network error
+            var monitor = services.GetRequiredService<SubscriptionSocketStateMonitor>();
+            monitor.AbortSocket();
+
+            //await host.StopAsync();
+
+            // waiting for completion message sent
+            for (int times = 0; !completionTriggered && times < 10; times++)
+            {
+                await Task.Delay(1_000);
+            }
 
             // assert
             Assert.True(commentary is not null && completionTriggered);
+
+            session.Dispose();
+        }
+    }
+
+    public class SubscriptionSocketStateMonitor
+    {
+        private const BindingFlags _bindingFlags = BindingFlags.NonPublic | BindingFlags.Instance;
+
+        private readonly ISessionPool _sessionPool;
+        private readonly Type _sessionPoolType;
+        private readonly FieldInfo _sessionsField;
+
+        private readonly FieldInfo _socketOperationsDictionaryField = typeof(Session).GetField("_operations", _bindingFlags)!;
+        private readonly FieldInfo _socketOperationManagerField = typeof(SocketOperation).GetField("_manager", _bindingFlags)!;
+        private readonly FieldInfo _socketProtocolField = typeof(Session)!.GetField("_socketProtocol", _bindingFlags)!;
+        private readonly FieldInfo _protocolReceiverField = typeof(GraphQLWebSocketProtocol).GetField("_receiver", _bindingFlags)!;
+
+        private Type? _sessionInfoType;
+        private PropertyInfo? _sessionProperty;
+        private Type? _receiverType;
+        private FieldInfo? _receiverClientField;
+
+        public SubscriptionSocketStateMonitor(ISessionPool sessionPool)
+        {
+            _sessionPool = sessionPool;
+            _sessionPoolType = _sessionPool.GetType();
+            _sessionsField = _sessionPoolType.GetField("_sessions", _bindingFlags)!;
+        }
+
+        public void AbortSocket()
+        {
+            var sessionInfos = (_sessionsField!.GetValue(_sessionPool) as System.Collections.IDictionary)!.Values;
+
+            foreach (var sessionInfo in sessionInfos)
+            {
+                _sessionInfoType ??= sessionInfo.GetType();
+                _sessionProperty ??= _sessionInfoType.GetProperty("Session")!;
+                var session = _sessionProperty.GetValue(sessionInfo) as Session;
+                var socketOperations = _socketOperationsDictionaryField
+                    .GetValue(session) as System.Collections.Concurrent.ConcurrentDictionary<string, SocketOperation>;
+
+                foreach (var operation in socketOperations!)
+                {
+                    var operationsession = _socketOperationManagerField.GetValue(operation.Value) as Session;
+                    var protocol = _socketProtocolField.GetValue(operationsession) as GraphQLWebSocketProtocol;
+
+                    var receiver = _protocolReceiverField.GetValue(protocol)!;
+
+                    _receiverType ??= receiver.GetType();
+                    _receiverClientField ??= _receiverType.GetField("_client", _bindingFlags)!;
+                    var client = _receiverClientField.GetValue(receiver) as ISocketClient;
+
+                    if (client!.IsClosed is false && client is WebSocketClient webSocketClient)
+                    {
+                        var socket = typeof(WebSocketClient).GetField("_socket", _bindingFlags)!.GetValue(webSocketClient) as ClientWebSocket;
+                        socket!.Abort();
+                    }
+                }
+            }
         }
     }
 }