Small fix and remove unneeded code

Author: aensidhe

src/progaudi.tarantool/IRequestWriter.cs

@@ -9,6 +9,6 @@ internal interface IRequestWriter : IDisposable
 
         bool IsConnected { get; }
 
-        Task Write(ArraySegment<byte> header, ArraySegment<byte> body);
+        void Write(ArraySegment<byte> header, ArraySegment<byte> body);
     }
 }

src/progaudi.tarantool/LogicalConnection.cs

@@ -140,9 +140,9 @@ private async Task<TResponse> SendRequestImpl<TRequest, TResponse>(TRequest requ
             var requestId = _requestIdCounter.GetRequestId();
             var responseTask = _responseReader.GetResponseTask(requestId);
 
-            var headerBuffer = CreateAndSerializeBuffer(request, requestId, bodyBuffer, out var headerLength);
-            await _requestWriter.Write(
-                new ArraySegment<byte>(headerBuffer, 0, Constants.PacketSizeBufferSize + (int) headerLength),
+            var headerBuffer = CreateAndSerializeHeader(request, requestId, bodyBuffer);
+            _requestWriter.Write(
+                headerBuffer,
                 new ArraySegment<byte>(bodyBuffer, 0, bodyBuffer.Length));
 
             try
@@ -175,11 +175,15 @@ private static string ToReadableString(byte[] bytes)
             return string.Join(" ", bytes.Select(b => b.ToString("X2")));
         }
 
-        private byte[] CreateAndSerializeBuffer<TRequest>(
+        private static string ToReadableString(ArraySegment<byte> bytes)
+        {
+            return string.Join(" ", bytes.Select(b => b.ToString("X2")));
+        }
+
+        private ArraySegment<byte> CreateAndSerializeHeader<TRequest>(
             TRequest request,
             RequestId requestId,
-            byte[] serializedRequest,
-            out long headerLength) where TRequest : IRequest
+            byte[] serializedRequest) where TRequest : IRequest
         {
             var packetSizeBuffer = new byte[Constants.PacketSizeBufferSize + Constants.MaxHeaderLength];
             var stream = new MemoryStream(packetSizeBuffer);
@@ -188,11 +192,12 @@ private byte[] CreateAndSerializeBuffer<TRequest>(
             stream.Seek(Constants.PacketSizeBufferSize, SeekOrigin.Begin);
             MsgPackSerializer.Serialize(requestHeader, stream, _msgPackContext);
 
-            headerLength = stream.Position - Constants.PacketSizeBufferSize;
+            var lengthAndHeaderLengthByteCount = (int)stream.Position;
+            var headerLength = lengthAndHeaderLengthByteCount - Constants.PacketSizeBufferSize;
             var packetLength = new PacketSize((uint) (headerLength + serializedRequest.Length));
             stream.Seek(0, SeekOrigin.Begin);
             MsgPackSerializer.Serialize(packetLength, stream, _msgPackContext);
-            return packetSizeBuffer;
+            return new ArraySegment<byte>(packetSizeBuffer, 0, lengthAndHeaderLengthByteCount);
         }
     }
 }

src/progaudi.tarantool/RequestWriter.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Threading;
-using System.Threading.Tasks;
 using ProGaudi.Tarantool.Client.Model;
 
 namespace ProGaudi.Tarantool.Client
@@ -44,7 +43,7 @@ public void BeginWriting()
 
         public bool IsConnected => !_disposed;
 
-        public Task Write(ArraySegment<byte> header, ArraySegment<byte> body)
+        public void Write(ArraySegment<byte> header, ArraySegment<byte> body)
         {
             if (_disposed)
             {
@@ -61,8 +60,6 @@ public Task Write(ArraySegment<byte> header, ArraySegment<byte> body)
 
             if (shouldSignal)
                 _newRequestsAvailable.Set();
-
-            return Task.CompletedTask;
         }
 
         public void Dispose()