From 4d311870d2f40f67da6df5641b53df637fdee88d Mon Sep 17 00:00:00 2001
From: Bond-009 <bond.009@outlook.com>
Date: Fri, 27 Dec 2019 14:42:53 +0100
Subject: Fix websocket handling

---
 .../HttpServer/WebSocketConnection.cs              | 73 +++++++++-------------
 1 file changed, 29 insertions(+), 44 deletions(-)

(limited to 'Emby.Server.Implementations/HttpServer')

diff --git a/Emby.Server.Implementations/HttpServer/WebSocketConnection.cs b/Emby.Server.Implementations/HttpServer/WebSocketConnection.cs
index 88974f9ab..913a51217 100644
--- a/Emby.Server.Implementations/HttpServer/WebSocketConnection.cs
+++ b/Emby.Server.Implementations/HttpServer/WebSocketConnection.cs
@@ -99,7 +99,6 @@ namespace Emby.Server.Implementations.HttpServer
         /// <param name="message">The message.</param>
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task.</returns>
-        /// <exception cref="ArgumentNullException">message</exception>
         public Task SendAsync<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
         {
             var json = JsonSerializer.SerializeToUtf8Bytes(message, _jsonOptions);
@@ -117,7 +116,6 @@ namespace Emby.Server.Implementations.HttpServer
             {
                 // Allocate at least 512 bytes from the PipeWriter
                 Memory<byte> memory = writer.GetMemory(512);
-
                 receiveresult = await _socket.ReceiveAsync(memory, cancellationToken);
                 int bytesRead = receiveresult.Count;
                 if (bytesRead == 0)
@@ -144,33 +142,30 @@ namespace Emby.Server.Implementations.HttpServer
                 }
             } while (_socket.State == WebSocketState.Open && receiveresult.MessageType != WebSocketMessageType.Close);
 
-            if (_socket.State == WebSocketState.Open)
-            {
-                _logger.LogWarning("Stopped reading from websocket before it was closed");
-            }
-
             Closed?.Invoke(this, EventArgs.Empty);
 
-            _socket.Dispose();
+            await _socket.CloseAsync(
+                WebSocketCloseStatus.NormalClosure,
+                string.Empty,
+                cancellationToken).ConfigureAwait(false);
         }
 
         private async Task ProcessInternal(PipeReader reader)
         {
+            ReadResult result = await reader.ReadAsync().ConfigureAwait(false);
+            ReadOnlySequence<byte> buffer = result.Buffer;
+
             if (OnReceive == null)
             {
+                // Tell the PipeReader how much of the buffer we have consumed
+                reader.AdvanceTo(buffer.End);
                 return;
             }
 
+            WebSocketMessage<object> stub;
             try
             {
-                var result = await reader.ReadAsync().ConfigureAwait(false);
-                if (!result.IsCompleted)
-                {
-                    return;
-                }
 
-                WebSocketMessage<object> stub;
-                var buffer = result.Buffer;
                 if (buffer.IsSingleSegment)
                 {
                     stub = JsonSerializer.Deserialize<WebSocketMessage<object>>(buffer.FirstSpan, _jsonOptions);
@@ -188,46 +183,36 @@ namespace Emby.Server.Implementations.HttpServer
                         ArrayPool<byte>.Shared.Return(buf);
                     }
                 }
-
-                var info = new WebSocketMessageInfo
-                {
-                    MessageType = stub.MessageType,
-                    Data = stub.Data.ToString(),
-                    Connection = this
-                };
-
-                await OnReceive(info).ConfigureAwait(false);
             }
             catch (JsonException ex)
             {
+                // Tell the PipeReader how much of the buffer we have consumed
+                reader.AdvanceTo(buffer.End);
                 _logger.LogError(ex, "Error processing web socket message");
+                return;
             }
-        }
 
-        /// <inheritdoc />
-        public void Dispose()
-        {
-            Dispose(true);
-            GC.SuppressFinalize(this);
-        }
+            // Tell the PipeReader how much of the buffer we have consumed
+            reader.AdvanceTo(buffer.End);
 
-        /// <summary>
-        /// Releases unmanaged and - optionally - managed resources.
-        /// </summary>
-        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
-        protected virtual void Dispose(bool dispose)
-        {
-            if (_disposed)
+            _logger.LogDebug("WS received message: {@Message}", stub);
+
+            var info = new WebSocketMessageInfo
             {
-                return;
-            }
+                MessageType = stub.MessageType,
+                Data = stub.Data?.ToString(), // Data can be null
+                Connection = this
+            };
+
+            _logger.LogDebug("WS message info: {@MessageInfo}", info);
 
-            if (dispose)
+            await OnReceive(info).ConfigureAwait(false);
+
+            // Stop reading if there's no more data coming
+            if (result.IsCompleted)
             {
-                _socket.Dispose();
+                return;
             }
-
-            _disposed = true;
         }
     }
 }
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