mono/mcs/class/System.ServiceModel/System.ServiceModel.Channels.NetTcp/TcpReplyChannel.cs

//
// TcpReplyChannel.cs
//
// Author:
//	Atsushi Enomoto <[email protected]>
//
// Copyright (C) 2009 Novell, Inc.  http://www.novell.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace System.ServiceModel.Channels.NetTcp
{
	internal class TcpReplyChannel : InternalReplyChannelBase
	{
		TcpClient client;
		TcpChannelInfo info;
		TcpBinaryFrameManager frame;

		public TcpReplyChannel (ChannelListenerBase listener, TcpChannelInfo info, TcpClient client)
			: base (listener)
		{
			this.client = client;
			this.info = info;
		}

		public MessageEncoder Encoder {
			get { return info.MessageEncoder; }
		}

		public override RequestContext ReceiveRequest (TimeSpan timeout)
		{
			if (timeout <= TimeSpan.Zero)
				throw new ArgumentException (String.Format ("Timeout value must be positive value. It was {0}", timeout));

			// FIXME: use timeout
			if (client == null)
				client = ((TcpChannelListener<IReplyChannel>) Manager).AcceptTcpClient (timeout);
			NetworkStream ns = client.GetStream ();
			frame = new TcpBinaryFrameManager (TcpBinaryFrameManager.SingletonUnsizedMode, ns, true) { Encoder = this.Encoder };

			// FIXME: use timeout
			if (!frame.ProcessPreambleRecipient ())
				return null;
			frame.ProcessPreambleAckRecipient ();

			var msg = frame.ReadUnsizedMessage (timeout);

			Logger.LogMessage (MessageLogSourceKind.TransportReceive, ref msg, info.BindingElement.MaxReceivedMessageSize);

			// LAMESPEC: it contradicts the protocol explanation at section 3.1.1.1.1 in [MC-NMF].
			// Moving ReadEndRecord() after context's WriteUnsizedMessage() causes TCP connection blocking.
			frame.ReadEndRecord ();
			return new TcpRequestContext (this, msg);
		}

		class TcpRequestContext : InternalRequestContext
		{
			public TcpRequestContext (TcpReplyChannel owner, Message request)
				: base (owner.Manager)
			{
				this.owner = owner;
				this.request = request;
			}

			TcpReplyChannel owner;
			Message request;

			public override Message RequestMessage {
				get { return request; }
			}

			public override void Abort ()
			{
				Close (TimeSpan.Zero);
			}

			public override void Close (TimeSpan timeout)
			{
			}

			public override void Reply (Message message, TimeSpan timeout)
			{
				Logger.LogMessage (MessageLogSourceKind.TransportSend, ref message, owner.info.BindingElement.MaxReceivedMessageSize);

				owner.frame.WriteUnsizedMessage (message, timeout);
				// FIXME: consider timeout here too.
				owner.frame.WriteEndRecord ();
			}
		}

		public override bool TryReceiveRequest (TimeSpan timeout, out RequestContext context)
		{
			try {
				context = ReceiveRequest (timeout);
				return context != null;
			} catch (Exception ex) {
				// FIXME: log it?
				// Console.WriteLine (ex);
				context = null;
				return false;
			}
		}

		public override bool WaitForRequest (TimeSpan timeout)
		{
			throw new NotImplementedException ();
		}
		
		bool close_started;
		object close_lock = new object ();

		protected override void OnClose (TimeSpan timeout)
		{
			lock (close_lock) {
				if (close_started)
					return;
				close_started = true;
			}

			client.Close ();
			client = null;
			base.OnClose (timeout);
		}

		protected override void OnOpen (TimeSpan timeout)
		{
		}
	}
}