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//
// TcpChannelListener.cs
//
// Author:
// Marcos Cobena (marcoscobena@gmail.com)
// Atsushi Enomoto (atsushi@ximian.com)
//
// Copyright 2007 Marcos Cobena (http://www.youcannoteatbits.org/)
// Copyright 2009-2010 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.Description;
using System.Text;
using System.Threading;
using System.Xml;
namespace System.ServiceModel.Channels.NetTcp
{
internal class TcpChannelListener<TChannel> : InternalChannelListenerBase<TChannel>
where TChannel : class, IChannel
{
BindingContext context;
TcpChannelInfo info;
TcpListener tcp_listener;
public TcpChannelListener (TcpTransportBindingElement source, BindingContext context)
: base (context)
{
XmlDictionaryReaderQuotas quotas = null;
foreach (BindingElement be in context.Binding.Elements) {
MessageEncodingBindingElement mbe = be as MessageEncodingBindingElement;
if (mbe != null) {
MessageEncoder = CreateEncoder<TChannel> (mbe);
quotas = mbe.GetProperty<XmlDictionaryReaderQuotas> (context);
break;
}
}
if (MessageEncoder == null)
MessageEncoder = new BinaryMessageEncoder ();
info = new TcpChannelInfo (source, MessageEncoder, quotas);
}
SynchronizedCollection<ManualResetEvent> accept_handles = new SynchronizedCollection<ManualResetEvent> ();
Queue<TcpClient> accepted_clients = new Queue<TcpClient> ();
SynchronizedCollection<TChannel> accepted_channels = new SynchronizedCollection<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 = accepted_clients.Count == 0 ? null : accepted_clients.Dequeue ();
if (client == null) {
var wait = new ManualResetEvent (false);
accept_handles.Add (wait);
if (!wait.WaitOne (timeout)) {
accept_handles.Remove (wait);
return null;
}
accept_handles.Remove (wait);
// recurse with new timeout, or return null if it's either being closed or timed out.
timeout -= (DateTime.Now - start);
return State == CommunicationState.Opened && timeout > TimeSpan.Zero ? AcceptTcpClient (timeout) : null;
}
// There might be bettwe way to exclude those TCP clients though ...
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 (TimeSpan.Zero);
}
protected override void OnClose (TimeSpan timeout)
{
if (State == CommunicationState.Closed)
return;
ProcessClose (timeout);
}
void ProcessClose (TimeSpan timeout)
{
if (tcp_listener == null)
throw new InvalidOperationException ("Current state is " + State);
//tcp_listener.Client.Close (Math.Max (50, (int) timeout.TotalMilliseconds));
tcp_listener.Stop ();
var l = new List<ManualResetEvent> (accept_handles);
foreach (var wait in l) // those handles will disappear from accepted_handles
wait.Set ();
tcp_listener = null;
}
protected override void OnOpen (TimeSpan timeout)
{
IPAddress address;
if (string.Equals (Uri.Host, "localhost", StringComparison.InvariantCultureIgnoreCase))
address = IPAddress.Any;
else {
IPHostEntry entry = Dns.GetHostEntry (Uri.Host);
if (entry.AddressList.Length == 0)
throw new ArgumentException (String.Format ("Invalid listen URI: {0}", Uri));
address = entry.AddressList [0];
}
int explicitPort = Uri.Port;
tcp_listener = new TcpListener (address, explicitPort <= 0 ? TcpTransportBindingElement.DefaultPort : explicitPort);
tcp_listener.Start ();
tcp_listener.BeginAcceptTcpClient (TcpListenerAcceptedClient, tcp_listener);
}
void TcpListenerAcceptedClient (IAsyncResult result)
{
var listener = (TcpListener) result.AsyncState;
try {
var client = listener.EndAcceptTcpClient (result);
if (client != null) {
accepted_clients.Enqueue (client);
if (accept_handles.Count > 0)
accept_handles [0].Set ();
}
} catch {
/* If an accept fails, just ignore it. Maybe the remote peer disconnected already */
} finally {
if (State == CommunicationState.Opened) {
try {
listener.BeginAcceptTcpClient (TcpListenerAcceptedClient, listener);
} catch {
/* If this fails, we must have disposed the listener */
}
}
}
}
}
}
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