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//
// TcpChannelListener.cs
//
// Author:
// Marcos Cobena (marcoscobena@gmail.com)
//
// Copyright 2007 Marcos Cobena (http://www.youcannoteatbits.org/)
//
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.ServiceModel.Description;
using System.Text;
using System.Threading;
using System.Xml;
namespace System.ServiceModel.Channels
{
internal class TcpChannelListener<TChannel> : InternalChannelListenerBase<TChannel>
where TChannel : class, IChannel
{
BindingContext context;
TcpChannelInfo info;
IDuplexSession session;
TcpListener tcp_listener;
public TcpChannelListener (TcpTransportBindingElement source, BindingContext context)
: base (context)
{
MessageEncoder encoder = null;
XmlDictionaryReaderQuotas quotas = null;
foreach (BindingElement be in context.RemainingBindingElements) {
MessageEncodingBindingElement mbe = be as MessageEncodingBindingElement;
if (mbe != null) {
encoder = CreateEncoder<TChannel> (mbe);
quotas = mbe.GetProperty<XmlDictionaryReaderQuotas> (context);
break;
}
}
if (encoder == null)
encoder = new BinaryMessageEncoder ();
info = new TcpChannelInfo (source, encoder, quotas);
}
List<ManualResetEvent> accept_handles = new List<ManualResetEvent> ();
List<TChannel> accepted_channels = new List<TChannel> ();
protected override TChannel OnAcceptChannel (TimeSpan timeout)
{
DateTime start = DateTime.Now;
// Close channels that are incorrectly kept open first.
var l = new List<TcpDuplexSessionChannel> ();
foreach (var tch in accepted_channels) {
var dch = tch as TcpDuplexSessionChannel;
if (dch != null && dch.TcpClient != null && !dch.TcpClient.Connected)
l.Add (dch);
}
foreach (var dch in l)
dch.Close (timeout - (DateTime.Now - start));
TcpClient client = AcceptTcpClient (timeout - (DateTime.Now - start));
if (client == null)
return null; // onclose
TChannel ch;
if (typeof (TChannel) == typeof (IDuplexSessionChannel))
ch = (TChannel) (object) new TcpDuplexSessionChannel (this, info, client);
else if (typeof (TChannel) == typeof (IReplyChannel))
ch = (TChannel) (object) new TcpReplyChannel (this, info, client);
else
throw new InvalidOperationException (String.Format ("Channel type {0} is not supported.", typeof (TChannel).Name));
((ChannelBase) (object) ch).Closed += delegate {
accepted_channels.Remove (ch);
};
accepted_channels.Add (ch);
return ch;
}
// TcpReplyChannel requires refreshed connection after each request processing.
internal TcpClient AcceptTcpClient (TimeSpan timeout)
{
DateTime start = DateTime.Now;
TcpClient client = null;
if (tcp_listener.Pending ()) {
client = tcp_listener.AcceptTcpClient ();
} else {
var wait = new ManualResetEvent (false);
tcp_listener.BeginAcceptTcpClient (delegate (IAsyncResult result) {
client = tcp_listener.EndAcceptTcpClient (result);
wait.Set ();
accept_handles.Remove (wait);
}, null);
if (State == CommunicationState.Closing)
return null;
accept_handles.Add (wait);
wait.WaitOne (timeout);
}
// This may be optional though ...
if (client != null) {
foreach (var ch in accepted_channels) {
var dch = ch as TcpDuplexSessionChannel;
if (dch == null || dch.TcpClient == null && !dch.TcpClient.Connected)
continue;
if (((IPEndPoint) dch.TcpClient.Client.RemoteEndPoint).Equals (client.Client.RemoteEndPoint))
// ... then it should be handled in another BeginTryReceive/EndTryReceive loop in ChannelDispatcher.
return AcceptTcpClient (timeout - (DateTime.Now - start));
}
}
return client;
}
[MonoTODO]
protected override bool OnWaitForChannel (TimeSpan timeout)
{
throw new NotImplementedException ();
}
// CommunicationObject
protected override void OnAbort ()
{
if (State == CommunicationState.Closed)
return;
ProcessClose ();
}
protected override void OnClose (TimeSpan timeout)
{
if (State == CommunicationState.Closed)
return;
ProcessClose ();
}
void ProcessClose ()
{
if (tcp_listener == null)
throw new InvalidOperationException ("Current state is " + State);
lock (accept_handles) {
foreach (var wait in accept_handles)
wait.Set ();
}
tcp_listener.Stop ();
tcp_listener = null;
}
protected override void OnOpen (TimeSpan timeout)
{
IPHostEntry entry = Dns.GetHostEntry (Uri.Host);
if (entry.AddressList.Length ==0)
throw new ArgumentException (String.Format ("Invalid listen URI: {0}", Uri));
int explicitPort = Uri.Port;
tcp_listener = new TcpListener (entry.AddressList [0], explicitPort <= 0 ? TcpTransportBindingElement.DefaultPort : explicitPort);
tcp_listener.Start ();
}
}
}
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