Rerfactor package parsing.

Frameworks/MQTTnet.NetStandard/Adapter/MqttChannelAdapter.cs

@@ -97,35 +97,29 @@ namespace MQTTnet.Adapter
             MqttBasePacket packet = null;
             await ExecuteAndWrapExceptionAsync(async () =>
             {
-                ReceivedMqttPacket receivedMqttPacket = null;
-                try
+                ReceivedMqttPacket receivedMqttPacket;
+
+                if (timeout > TimeSpan.Zero)
                 {
-                    if (timeout > TimeSpan.Zero)
-                    {
-                        receivedMqttPacket = await Internal.TaskExtensions.TimeoutAfter(ct => ReceiveAsync(_channel, ct), timeout, cancellationToken).ConfigureAwait(false);
-                    }
-                    else
-                    {
-                        receivedMqttPacket = await ReceiveAsync(_channel, cancellationToken).ConfigureAwait(false);
-                    }
-
-                    if (receivedMqttPacket == null || cancellationToken.IsCancellationRequested)
-                    {
-                        throw new TaskCanceledException();
-                    }
-
-                    packet = PacketSerializer.Deserialize(receivedMqttPacket);
-                    if (packet == null)
-                    {
-                        throw new MqttProtocolViolationException("Received malformed packet.");
-                    }
-
-                    _logger.Verbose("RX <<< {0}", packet);
+                    receivedMqttPacket = await Internal.TaskExtensions.TimeoutAfter(ct => ReceiveAsync(_channel, ct), timeout, cancellationToken).ConfigureAwait(false);
                 }
-                finally
+                else
                 {
-                    receivedMqttPacket?.Dispose();
+                    receivedMqttPacket = await ReceiveAsync(_channel, cancellationToken).ConfigureAwait(false);
                 }
+
+                if (receivedMqttPacket == null || cancellationToken.IsCancellationRequested)
+                {
+                    return;
+                }
+
+                packet = PacketSerializer.Deserialize(receivedMqttPacket);
+                if (packet == null)
+                {
+                    throw new MqttProtocolViolationException("Received malformed packet.");
+                }
+
+                _logger.Verbose("RX <<< {0}", packet);
             }).ConfigureAwait(false);
 
             return packet;
@@ -134,7 +128,11 @@ namespace MQTTnet.Adapter
         private async Task<ReceivedMqttPacket> ReceiveAsync(IMqttChannel channel, CancellationToken cancellationToken)
         {
             var fixedHeader = await MqttPacketReader.ReadFixedHeaderAsync(channel, cancellationToken).ConfigureAwait(false);
-            
+            if (fixedHeader == null)
+            {
+                return null;
+            }
+
             try
             {
                 ReadingPacketStarted?.Invoke(this, EventArgs.Empty);
@@ -144,31 +142,28 @@ namespace MQTTnet.Adapter
                     return new ReceivedMqttPacket(fixedHeader.Flags, null);
                 }
 
-                var body = new MemoryStream(fixedHeader.RemainingLength);
+                var body = new byte[fixedHeader.RemainingLength];
+                var bodyOffset = 0;
+                var chunkSize = Math.Min(ReadBufferSize, fixedHeader.RemainingLength);
 
-                var buffer = new byte[Math.Min(ReadBufferSize, fixedHeader.RemainingLength)];
-                while (body.Length < fixedHeader.RemainingLength)
+                do
                 {
-                    var bytesLeft = fixedHeader.RemainingLength - (int)body.Length;
-                    if (bytesLeft > buffer.Length)
+                    var bytesLeft = body.Length - bodyOffset;
+                    if (chunkSize > bytesLeft)
                     {
-                        bytesLeft = buffer.Length;
+                        chunkSize = bytesLeft;
                     }
 
-                    var readBytes = await channel.ReadAsync(buffer, 0, bytesLeft, cancellationToken).ConfigureAwait(false);
+                    var readBytes = await channel.ReadAsync(body, bodyOffset, chunkSize, cancellationToken) .ConfigureAwait(false);
                     if (readBytes <= 0)
                     {
                         ExceptionHelper.ThrowGracefulSocketClose();
                     }
 
-                    // Here is no need to await because internally only an array is used and no real I/O operation is made.
-                    // Using async here will only generate overhead.
-                    body.Write(buffer, 0, readBytes);
-                }
+                    bodyOffset += readBytes;
+                } while (bodyOffset < body.Length);
 
-                body.Seek(0L, SeekOrigin.Begin);
-
-                return new ReceivedMqttPacket(fixedHeader.Flags, body);
+                return new ReceivedMqttPacket(fixedHeader.Flags, new MqttPacketBodyReader(body));
             }
             finally
             {

Frameworks/MQTTnet.NetStandard/Adapter/ReceivedMqttPacket.cs

@@ -1,11 +1,10 @@
-using System;
-using System.IO;
+using MQTTnet.Serializer;
 
 namespace MQTTnet.Adapter
 {
-    public class ReceivedMqttPacket : IDisposable
+    public class ReceivedMqttPacket
     {
-        public ReceivedMqttPacket(byte fixedHeader, MemoryStream body)
+        public ReceivedMqttPacket(byte fixedHeader, MqttPacketBodyReader body)
         {
             FixedHeader = fixedHeader;
             Body = body;
@@ -13,11 +12,6 @@ namespace MQTTnet.Adapter
 
         public byte FixedHeader { get; }
 
-        public MemoryStream Body { get; }
-
-        public void Dispose()
-        {
-            Body?.Dispose();
-        }
+        public MqttPacketBodyReader Body { get; }
     }
 }

Frameworks/MQTTnet.NetStandard/Client/MqttClientTcpOptions.cs

@@ -9,5 +9,10 @@
         public int BufferSize { get; set; } = 4096;
 
         public MqttClientTlsOptions TlsOptions { get; set; } = new MqttClientTlsOptions();
+
+        public override string ToString()
+        {
+            return Server + ":" + this.GetPort();
+        }
     }
 }

Frameworks/MQTTnet.NetStandard/Client/MqttClientWebSocketOptions.cs

@@ -13,8 +13,11 @@ namespace MQTTnet.Client
 
         public CookieContainer CookieContainer { get; set; }
 
-        public int BufferSize { get; set; } = 4096;
-
         public MqttClientTlsOptions TlsOptions { get; set; } = new MqttClientTlsOptions();
+
+        public override string ToString()
+        {
+            return Uri;
+        }
     }
 }

Frameworks/MQTTnet.NetStandard/Internal/TestMqttChannel.cs

@@ -3,7 +3,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Channel;
 
-namespace MQTTnet.Core.Internal
+namespace MQTTnet.Internal
 {
     public class TestMqttChannel : IMqttChannel
     {

Frameworks/MQTTnet.NetStandard/MqttFactory.cs

@@ -4,7 +4,6 @@ using MQTTnet.Adapter;
 using MQTTnet.Client;
 using MQTTnet.Diagnostics;
 using MQTTnet.Implementations;
-using MQTTnet.ManagedClient;
 using MQTTnet.Server;
 
 namespace MQTTnet
@@ -23,18 +22,6 @@ namespace MQTTnet
             return new MqttClient(new MqttClientAdapterFactory(), logger);
         }
 
-        public IManagedMqttClient CreateManagedMqttClient()
-        {
-            return new ManagedMqttClient(CreateMqttClient(), new MqttNetLogger().CreateChildLogger());
-        }
-
-        public IManagedMqttClient CreateManagedMqttClient(IMqttNetLogger logger)
-        {
-            if (logger == null) throw new ArgumentNullException(nameof(logger));
-
-            return new ManagedMqttClient(CreateMqttClient(), logger.CreateChildLogger());
-        }
-
         public IMqttServer CreateMqttServer()
         {
             var logger = new MqttNetLogger();

Frameworks/MQTTnet.NetStandard/Serializer/Extensions.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace MQTTnet.Serializer
+{
+    public static class Extensions
+    {
+        public static byte[] ToArray(this ArraySegment<byte> source)
+        {
+            if (source.Array == null)
+            {
+                return null;
+            }
+
+            var buffer = new byte[source.Count];
+            Buffer.BlockCopy(source.Array, source.Offset, buffer, 0, buffer.Length);
+
+            return buffer;
+        }
+    }
+}

Frameworks/MQTTnet.NetStandard/Serializer/MqttFixedHeader.cs

@@ -1,6 +1,6 @@
 namespace MQTTnet.Serializer
 {
-    public struct MqttFixedHeader
+    public class MqttFixedHeader
     {
         public MqttFixedHeader(byte flags, int remainingLength)
         {
@@ -10,6 +10,6 @@
 
         public byte Flags { get; }
 
-        public int RemainingLength { get; }
+        public int RemainingLength { get; set; }
     }
 }

Frameworks/MQTTnet.NetStandard/Serializer/MqttPacketBodyReader.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Text;
+
+namespace MQTTnet.Serializer
+{
+    public class MqttPacketBodyReader
+    {
+        private readonly byte[] _buffer;
+        private int _offset;
+
+        public MqttPacketBodyReader(byte[] buffer)
+        {
+            _buffer = buffer;
+        }
+
+        public int Length => _buffer.Length - _offset;
+
+        public bool EndOfStream => _offset == _buffer.Length;
+
+        public byte ReadByte()
+        {
+            return _buffer[_offset++];
+        }
+
+        public ArraySegment<byte> ReadRemainingData()
+        {
+            return new ArraySegment<byte>(_buffer, _offset, _buffer.Length - _offset);
+        }
+
+        public ushort ReadUInt16()
+        {
+            var msb = _buffer[_offset++];
+            var lsb = _buffer[_offset++];
+            
+            return (ushort)(msb << 8 | lsb);
+        }
+
+        public ArraySegment<byte> ReadWithLengthPrefix()
+        {
+            var length = ReadUInt16();
+
+            var result = new ArraySegment<byte>(_buffer, _offset, length);
+            _offset += length;
+
+            return result;
+        }
+
+        public string ReadStringWithLengthPrefix()
+        {
+            var buffer = ReadWithLengthPrefix();
+            return Encoding.UTF8.GetString(buffer.Array, buffer.Offset, buffer.Count);
+        }
+    }
+}

Frameworks/MQTTnet.NetStandard/Serializer/MqttPacketReader.cs

@@ -1,7 +1,4 @@
-using System;
-using System.IO;
-using System.Text;
-using System.Threading;
+using System.Threading;
 using System.Threading.Tasks;
 using MQTTnet.Channel;
 using MQTTnet.Exceptions;
@@ -23,6 +20,11 @@ namespace MQTTnet.Serializer
                 var bytesRead = await channel.ReadAsync(buffer, 0, buffer.Length - totalBytesRead, cancellationToken).ConfigureAwait(false);
                 if (bytesRead <= 0)
                 {
+                    if (cancellationToken.IsCancellationRequested)
+                    {
+                        return null;
+                    }
+
                     ExceptionHelper.ThrowGracefulSocketClose();
                 }
 
@@ -35,78 +37,20 @@ namespace MQTTnet.Serializer
                 return new MqttFixedHeader(buffer[0], 0);
             }
 
-            var bodyLength = await ReadBodyLengthAsync(channel, buffer[1], cancellationToken);
+            var bodyLength = await ReadBodyLengthAsync(channel, buffer[1], cancellationToken).ConfigureAwait(false);
             return new MqttFixedHeader(buffer[0], bodyLength);
         }
 
-        public static ushort ReadUInt16(this Stream stream)
-        {
-            var buffer = stream.ReadBytes(2);
-
-            var temp = buffer[0];
-            buffer[0] = buffer[1];
-            buffer[1] = temp;
-
-            return BitConverter.ToUInt16(buffer, 0);
-        }
-
-        public static string ReadStringWithLengthPrefix(this Stream stream)
-        {
-            var buffer = stream.ReadWithLengthPrefix();
-            if (buffer.Length == 0)
-            {
-                return string.Empty;
-            }
-
-            return Encoding.UTF8.GetString(buffer, 0, buffer.Length);
-        }
-
-        public static byte[] ReadWithLengthPrefix(this Stream stream)
-        {
-            var length = stream.ReadUInt16();
-            if (length == 0)
-            {
-                return new byte[0];
-            }
-
-            return stream.ReadBytes(length);
-        }
-
-        public static byte[] ReadRemainingData(this Stream stream)
-        {
-            return stream.ReadBytes((int)(stream.Length - stream.Position));
-        }
-
-        private static byte[] ReadBytes(this Stream stream, int count)
-        {
-            var buffer = new byte[count];
-            var readBytes = stream.Read(buffer, 0, count);
-
-            if (readBytes != count)
-            {
-                throw new InvalidOperationException($"Unable to read {count} bytes from the stream.");
-            }
-
-            return buffer;
-        }
-
         private static async Task<int> ReadBodyLengthAsync(IMqttChannel channel, byte initialEncodedByte, CancellationToken cancellationToken)
         {
             // Alorithm taken from https://docs.oasis-open.org/mqtt/mqtt/v3.1.1/errata01/os/mqtt-v3.1.1-errata01-os-complete.html.
             var multiplier = 128;
             var value = initialEncodedByte & 127;
             int encodedByte = initialEncodedByte;
-            var buffer = new byte[1];
-            
+
             while ((encodedByte & 128) != 0)
             {
-                var readCount = await channel.ReadAsync(buffer, 0, 1, cancellationToken).ConfigureAwait(false);
-                if (readCount <= 0)
-                {
-                    ExceptionHelper.ThrowGracefulSocketClose();
-                }
-
-                encodedByte = buffer[0];
+                encodedByte = await ReadByteAsync(channel, cancellationToken).ConfigureAwait(false);
 
                 value += (byte)(encodedByte & 127) * multiplier;
                 if (multiplier > 128 * 128 * 128)
@@ -119,5 +63,17 @@ namespace MQTTnet.Serializer
 
             return value;
         }
+
+        private static async Task<byte> ReadByteAsync(IMqttChannel channel, CancellationToken cancellationToken)
+        {
+            var buffer = new byte[1];
+            var readCount = await channel.ReadAsync(buffer, 0, 1, cancellationToken).ConfigureAwait(false);
+            if (readCount <= 0)
+            {
+                ExceptionHelper.ThrowGracefulSocketClose();
+            }
+
+            return buffer[0];
+        }
     }
 }

Frameworks/MQTTnet.NetStandard/Serializer/MqttPacketSerializer.cs

@@ -104,7 +104,7 @@ namespace MQTTnet.Serializer
             }
         }
 
-        private static MqttBasePacket DeserializeUnsubAck(Stream body)
+        private static MqttBasePacket DeserializeUnsubAck(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -114,7 +114,7 @@ namespace MQTTnet.Serializer
             };
         }
 
-        private static MqttBasePacket DeserializePubComp(Stream body)
+        private static MqttBasePacket DeserializePubComp(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -124,7 +124,7 @@ namespace MQTTnet.Serializer
             };
         }
 
-        private static MqttBasePacket DeserializePubRel(Stream body)
+        private static MqttBasePacket DeserializePubRel(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -134,7 +134,7 @@ namespace MQTTnet.Serializer
             };
         }
 
-        private static MqttBasePacket DeserializePubRec(Stream body)
+        private static MqttBasePacket DeserializePubRec(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -144,7 +144,7 @@ namespace MQTTnet.Serializer
             };
         }
 
-        private static MqttBasePacket DeserializePubAck(Stream body)
+        private static MqttBasePacket DeserializePubAck(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -154,7 +154,7 @@ namespace MQTTnet.Serializer
             };
         }
 
-        private static MqttBasePacket DeserializeUnsubscribe(Stream body)
+        private static MqttBasePacket DeserializeUnsubscribe(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -163,7 +163,7 @@ namespace MQTTnet.Serializer
                 PacketIdentifier = body.ReadUInt16(),
             };
 
-            while (body.Position != body.Length)
+            while (!body.EndOfStream)
             {
                 packet.TopicFilters.Add(body.ReadStringWithLengthPrefix());
             }
@@ -171,7 +171,7 @@ namespace MQTTnet.Serializer
             return packet;
         }
 
-        private static MqttBasePacket DeserializeSubscribe(Stream body)
+        private static MqttBasePacket DeserializeSubscribe(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -180,7 +180,7 @@ namespace MQTTnet.Serializer
                 PacketIdentifier = body.ReadUInt16()
             };
 
-            while (body.Position != body.Length)
+            while (!body.EndOfStream)
             {
                 packet.TopicFilters.Add(new TopicFilter(
                     body.ReadStringWithLengthPrefix(),
@@ -213,7 +213,7 @@ namespace MQTTnet.Serializer
                 PacketIdentifier = packetIdentifier,
                 Retain = retain,
                 Topic = topic,
-                Payload = body.ReadRemainingData(),
+                Payload = body.ReadRemainingData().ToArray(),
                 QualityOfServiceLevel = qualityOfServiceLevel,
                 Dup = dup
             };
@@ -221,7 +221,7 @@ namespace MQTTnet.Serializer
             return packet;
         }
 
-        private static MqttBasePacket DeserializeConnect(Stream body)
+        private static MqttBasePacket DeserializeConnect(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -279,7 +279,7 @@ namespace MQTTnet.Serializer
                 packet.WillMessage = new MqttApplicationMessage
                 {
                     Topic = body.ReadStringWithLengthPrefix(),
-                    Payload = body.ReadWithLengthPrefix(),
+                    Payload = body.ReadWithLengthPrefix().ToArray(),
                     QualityOfServiceLevel = (MqttQualityOfServiceLevel)willQoS,
                     Retain = willRetain
                 };
@@ -299,7 +299,7 @@ namespace MQTTnet.Serializer
             return packet;
         }
 
-        private static MqttBasePacket DeserializeSubAck(Stream body)
+        private static MqttBasePacket DeserializeSubAck(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -308,7 +308,7 @@ namespace MQTTnet.Serializer
                 PacketIdentifier = body.ReadUInt16()
             };
 
-            while (body.Position != body.Length)
+            while (!body.EndOfStream)
             {
                 packet.SubscribeReturnCodes.Add((MqttSubscribeReturnCode)body.ReadByte());
             }
@@ -316,7 +316,7 @@ namespace MQTTnet.Serializer
             return packet;
         }
 
-        private MqttBasePacket DeserializeConnAck(Stream body)
+        private MqttBasePacket DeserializeConnAck(MqttPacketBodyReader body)
         {
             ThrowIfBodyIsEmpty(body);
 
@@ -614,7 +614,7 @@ namespace MQTTnet.Serializer
             return MqttPacketWriter.BuildFixedHeader(type);
         }
 
-        private static void ThrowIfBodyIsEmpty(Stream body)
+        private static void ThrowIfBodyIsEmpty(MqttPacketBodyReader body)
         {
             if (body == null || body.Length == 0)
             {

Frameworks/MQTTnet.NetStandard/Server/MqttClientSession.cs

@@ -86,8 +86,11 @@ namespace MQTTnet.Server
                 while (!_cancellationTokenSource.IsCancellationRequested)
                 {
                     var packet = await adapter.ReceivePacketAsync(TimeSpan.Zero, _cancellationTokenSource.Token).ConfigureAwait(false);
-                    _keepAliveMonitor.PacketReceived(packet);
-                    await ProcessReceivedPacketAsync(adapter, packet, _cancellationTokenSource.Token).ConfigureAwait(false);
+                    if (packet != null)
+                    {
+                        _keepAliveMonitor.PacketReceived(packet);
+                        await ProcessReceivedPacketAsync(adapter, packet, _cancellationTokenSource.Token).ConfigureAwait(false);
+                    }
                 }
             }
             catch (OperationCanceledException)
@@ -351,7 +354,7 @@ namespace MQTTnet.Server
 
         private Task HandleIncomingPublishPacketWithQoS2(IMqttChannelAdapter adapter, MqttApplicationMessage applicationMessage, MqttPublishPacket publishPacket, CancellationToken cancellationToken)
         {
-            // QoS 2 is implement as method "B" [4.3.3 QoS 2: Exactly once delivery]
+            // QoS 2 is implement as method "B" (4.3.3 QoS 2: Exactly once delivery)
             _sessionsManager.StartDispatchApplicationMessage(this, applicationMessage);
 
             var response = new MqttPubRecPacket { PacketIdentifier = publishPacket.PacketIdentifier };

Frameworks/MQTTnet.NetStandard/Server/MqttClientSessionsManager.cs

@@ -41,11 +41,15 @@ namespace MQTTnet.Server
 
             try
             {
-                if (!(await clientAdapter.ReceivePacketAsync(_options.DefaultCommunicationTimeout, cancellationToken)
-                    .ConfigureAwait(false) is MqttConnectPacket connectPacket))
+                var firstPacket = await clientAdapter.ReceivePacketAsync(_options.DefaultCommunicationTimeout, cancellationToken).ConfigureAwait(false);
+                if (firstPacket == null)
                 {
-                    throw new MqttProtocolViolationException(
-                        "The first packet from a client must be a 'CONNECT' packet [MQTT-3.1.0-1].");
+                    return;
+                }
+
+                if (!(firstPacket is MqttConnectPacket connectPacket))
+                {
+                    throw new MqttProtocolViolationException("The first packet from a client must be a 'CONNECT' packet [MQTT-3.1.0-1].");
                 }
 
                 clientId = connectPacket.ClientId;