Add LoggingConnectionFilter.

samples/SampleApp/Startup.cs

@@ -8,7 +8,7 @@ using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Http.Features;
 using Microsoft.AspNet.Server.Kestrel;
-using Microsoft.AspNet.Server.Kestrel.Https;
+using Microsoft.AspNet.Server.Kestrel.Filter;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.PlatformAbstractions;
 
@@ -39,6 +39,8 @@ namespace SampleApp
                 Console.WriteLine("Could not find certificate at '{0}'. HTTPS is not enabled.", testCertPath);
             }
 
+            app.UseKestrelConnectionLogging();
+
             app.Run(async context =>
             {
                 Console.WriteLine("{0} {1}{2}{3}",

src/Microsoft.AspNet.Server.Kestrel.Https/HttpsApplicationBuilderExtensions.cs

@@ -4,9 +4,9 @@
 using System.Security.Cryptography.X509Certificates;
 using Microsoft.AspNet.Builder;
 using Microsoft.AspNet.Http.Features;
-using Microsoft.AspNet.Server.Kestrel.Filter;
+using Microsoft.AspNet.Server.Kestrel.Https;
 
-namespace Microsoft.AspNet.Server.Kestrel.Https
+namespace Microsoft.AspNet.Server.Kestrel.Filter
 {
     public static class HttpsApplicationBuilderExtensions
     {

src/Microsoft.AspNet.Server.Kestrel/Filter/LoggingConnectionFilter.cs

@@ -0,0 +1,37 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.AspNet.Server.Kestrel.Filter
+{
+    public class LoggingConnectionFilter : IConnectionFilter
+    {
+        private readonly ILogger _logger;
+        private readonly IConnectionFilter _previous;
+
+        public LoggingConnectionFilter(ILogger logger, IConnectionFilter previous)
+        {
+            if (logger == null)
+            {
+                throw new ArgumentNullException(nameof(logger));
+            }
+            if (previous == null)
+            {
+                throw new ArgumentNullException(nameof(previous));
+            }
+
+            _logger = logger;
+            _previous = previous;
+        }
+
+        public async Task OnConnection(ConnectionFilterContext context)
+        {
+            await _previous.OnConnection(context);
+
+            context.Connection = new LoggingStream(context.Connection, _logger);
+        }
+    }
+}

src/Microsoft.AspNet.Server.Kestrel/Filter/LoggingFilterApplicationBuilderExtensions.cs

@@ -0,0 +1,39 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.AspNet.Builder;
+using Microsoft.AspNet.Http.Features;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.AspNet.Server.Kestrel.Filter
+{
+    public static class LoggingFilterApplicationBuilderExtensions
+    {
+        /// <summary>
+        /// Emits verbose logs for bytes read from and written to the connection.
+        /// </summary>
+        /// <returns></returns>
+        public static IApplicationBuilder UseKestrelConnectionLogging(this IApplicationBuilder app)
+        {
+            return app.UseKestrelConnectionLogging(nameof(LoggingConnectionFilter));
+        }
+
+        /// <summary>
+        /// Emits verbose logs for bytes read from and written to the connection.
+        /// </summary>
+        /// <returns></returns>
+        public static IApplicationBuilder UseKestrelConnectionLogging(this IApplicationBuilder app, string loggerName)
+        {
+            var serverInfo = app.ServerFeatures.Get<IKestrelServerInformation>();
+            if (serverInfo != null)
+            {
+                var prevFilter = serverInfo.ConnectionFilter ?? new NoOpConnectionFilter();
+                var loggerFactory = app.ApplicationServices.GetRequiredService<ILoggerFactory>();
+                var logger = loggerFactory.CreateLogger(loggerName ?? nameof(LoggingConnectionFilter));
+                serverInfo.ConnectionFilter = new LoggingConnectionFilter(logger, prevFilter);
+            }
+            return app;
+        }
+    }
+}

src/Microsoft.AspNet.Server.Kestrel/Filter/LoggingStream.cs

@@ -0,0 +1,129 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.AspNet.Server.Kestrel.Filter
+{
+    internal class LoggingStream : Stream
+    {
+        private readonly Stream _inner;
+        private readonly ILogger _logger;
+
+        public LoggingStream(Stream inner, ILogger logger)
+        {
+            _inner = inner;
+            _logger = logger;
+        }
+
+        public override bool CanRead
+        {
+            get
+            {
+                return _inner.CanRead;
+            }
+        }
+
+        public override bool CanSeek
+        {
+            get
+            {
+                return _inner.CanSeek;
+            }
+        }
+
+        public override bool CanWrite
+        {
+            get
+            {
+                return _inner.CanWrite;
+            }
+        }
+
+        public override long Length
+        {
+            get
+            {
+                return _inner.Length;
+            }
+        }
+
+        public override long Position
+        {
+            get
+            {
+                return _inner.Position;
+            }
+
+            set
+            {
+                _inner.Position = value;
+            }
+        }
+
+        public override void Flush()
+        {
+            _inner.Flush();
+        }
+
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            int read = _inner.Read(buffer, offset, count);
+            Log("Read", read, buffer, offset);
+            return read;
+        }
+
+        public async override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            int read = await _inner.ReadAsync(buffer, offset, count, cancellationToken);
+            Log("ReadAsync", read, buffer, offset);
+            return read;
+        }
+
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            return _inner.Seek(offset, origin);
+        }
+
+        public override void SetLength(long value)
+        {
+            _inner.SetLength(value);
+        }
+
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            Log("Write", count, buffer, offset);
+            _inner.Write(buffer, offset, count);
+        }
+
+        public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            Log("WriteAsync", count, buffer, offset);
+            return _inner.WriteAsync(buffer, offset, count, cancellationToken);
+        }
+
+        private void Log(string method, int count, byte[] buffer, int offset)
+        {
+            var builder = new StringBuilder($"{method}[{count}] ");
+
+            // Write the hex
+            for (int i = offset; i < offset + count; i++)
+            {
+                builder.Append(buffer[i].ToString("X2"));
+                builder.Append(" ");
+            }
+            builder.AppendLine();
+            // Write the bytes as if they were ASCII
+            for (int i = offset; i < offset + count; i++)
+            {
+                builder.Append((char)buffer[i]);
+            }
+
+            _logger.LogVerbose(builder.ToString());
+        }
+    }
+}