mcs/class/System.ServiceModel/System.ServiceModel.Channels.Http/HttpListenerManager.cs

   1 //
   2 // HttpListenerManager.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2010 Novell, Inc.  http://www.novell.com
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.Collections.Generic;
  30 using System.Collections.ObjectModel;
  31 using System.Linq;
  32 using System.Net;
  33 using System.Net.Security;
  34 using System.ServiceModel;
  35 using System.ServiceModel.Channels;
  36 using System.ServiceModel.Description;
  37 using System.ServiceModel.Dispatcher;
  38 using System.ServiceModel.Security;
  39 using System.Text;
  40 using System.Threading;
  41
  42 namespace System.ServiceModel.Channels.Http
  43 {
  44         internal abstract class HttpListenerManager
  45         {
  46                 protected HttpListenerManager ()
  47                 {
  48                         Entries = new List<HttpChannelListenerEntry> ();
  49                 }
  50
  51                 public List<HttpChannelListenerEntry> Entries { get; private set; }
  52
  53                 public abstract void RegisterListener (ChannelDispatcher channel, HttpTransportBindingElement element, TimeSpan timeout);
  54                 public abstract void UnregisterListener (ChannelDispatcher channel, TimeSpan timeout);
  55
  56                 protected void RegisterListenerCommon (ChannelDispatcher channel, TimeSpan timeout)
  57                 {
  58                         Entries.Add (new HttpChannelListenerEntry (channel, new AutoResetEvent (false)));
  59
  60                         Entries.Sort (HttpChannelListenerEntry.CompareEntries);
  61                 }
  62
  63                 protected void UnregisterListenerCommon (ChannelDispatcher channel, TimeSpan timeout)
  64                 {
  65                         var entry = Entries.First (e => e.ChannelDispatcher == channel);
  66                         Entries.Remove (entry);
  67
  68                         entry.WaitHandle.Set (); // make sure to finish pending requests.
  69                 }
  70
  71                 public void ProcessNewContext (HttpContextInfo ctxi)
  72                 {
  73                         var ce = SelectChannel (ctxi);
  74                         if (ce == null)
  75                                 throw new InvalidOperationException ("HttpListenerContext does not match any of the registered channels");
  76                         ce.ContextQueue.Enqueue (ctxi);
  77                         ce.WaitHandle.Set ();
  78                 }
  79
  80                 HttpChannelListenerEntry SelectChannel (HttpContextInfo ctx)
  81                 {
  82                         foreach (var e in Entries)
  83                                 if (e.FilterHttpContext (ctx))
  84                                         return e;
  85                         return null;
  86                 }
  87
  88                 public bool TryDequeueRequest (ChannelDispatcher channel, TimeSpan timeout, out HttpContextInfo context)
  89                 {
  90                         DateTime start = DateTime.Now;
  91
  92                         context = null;
  93                         var ce = Entries.FirstOrDefault (e => e.ChannelDispatcher == channel);
  94                         if (ce == null)
  95                                 return false;
  96                         lock (ce.RetrieverLock) {
  97                                 var q = ce.ContextQueue;
  98                                 if (q.Count == 0) {
  99                                         TimeSpan waitTimeout = timeout;
 100                                         if (timeout == TimeSpan.MaxValue)
 101                                                 waitTimeout = TimeSpan.FromMilliseconds (int.MaxValue);
 102                                         bool ret = ce.WaitHandle.WaitOne (waitTimeout);
 103                                         return ret && TryDequeueRequest (channel, waitTimeout - (DateTime.Now - start), out context); // recurse, am lazy :/
 104                                 }
 105                                 context = q.Dequeue ();
 106                                 return true;
 107                         }
 108                 }
 109         }
 110
 111         internal class HttpStandaloneListenerManager : HttpListenerManager
 112         {
 113                 public HttpStandaloneListenerManager (Uri uri, HttpTransportBindingElement element)
 114                 {
 115                         var l = new HttpListener ();
 116
 117                         string uriString = element.HostNameComparisonMode == HostNameComparisonMode.Exact ? uri.ToString () : uri.Scheme + "://*" + uri.GetComponents (UriComponents.Port | UriComponents.Path, UriFormat.SafeUnescaped);
 118                         if (!uriString.EndsWith ("/", StringComparison.Ordinal))
 119                                 uriString += "/"; // HttpListener requires this mess.
 120
 121                         l.Prefixes.Add (uriString);
 122
 123                         this.listener = l;
 124                 }
 125
 126                 HttpListener listener;
 127
 128                 Thread loop;
 129
 130                 // FIXME: use timeout
 131                 public override void RegisterListener (ChannelDispatcher channel, HttpTransportBindingElement element, TimeSpan timeout)
 132                 {
 133                         RegisterListenerCommon (channel, timeout);
 134
 135                         if (Entries.Count != 1)
 136                                 return;
 137
 138                         if (element != null) {
 139                                 var l = listener;
 140                                 l.AuthenticationSchemeSelectorDelegate = delegate (HttpListenerRequest req) {
 141                                         return element.AuthenticationScheme;
 142                                 };
 143                                 l.Realm = element.Realm;
 144                                 l.UnsafeConnectionNtlmAuthentication = element.UnsafeConnectionNtlmAuthentication;
 145                         }
 146
 147                         // Start here. It is shared between channel listeners
 148                         // that share the same listen Uri. So there is no other appropriate place.
 149 #if USE_SEPARATE_LOOP // this cannot be enabled because it causes infinite loop when ChannelDispatcher is not involved.
 150                         loop = new Thread (new ThreadStart (delegate {
 151                                 listener.Start ();
 152                                 try {
 153                                         while (true)
 154                                                 ProcessNewContext (listener.GetContext ());
 155                                 } catch (ThreadAbortException) {
 156                                         Thread.ResetAbort ();
 157                                 }
 158                                 listener.Stop ();
 159                         }));
 160                         loop.Start ();
 161 #else
 162                         listener.Start ();
 163                         listener.BeginGetContext (GetContextCompleted, null);
 164 #endif
 165                 }
 166
 167                 // FIXME: use timeout
 168                 public override void UnregisterListener (ChannelDispatcher channel, TimeSpan timeout)
 169                 {
 170                         UnregisterListenerCommon (channel, timeout);
 171
 172                         // stop the server if there is no more registered listener.
 173                         if (Entries.Count > 0)
 174                                 return;
 175
 176 #if USE_SEPARATE_LOOP
 177                         loop.Abort ();
 178 #else
 179                         this.listener.Stop ();
 180 #endif
 181                 }
 182
 183                 void GetContextCompleted (IAsyncResult result)
 184                 {
 185                         var ctx = listener.EndGetContext (result);
 186                         ProcessNewContext (ctx);
 187                         // start another listening
 188                         listener.BeginGetContext (GetContextCompleted, null);
 189                 }
 190
 191                 void ProcessNewContext (HttpListenerContext ctx)
 192                 {
 193                         if (ctx == null)
 194                                 return;
 195                         ProcessNewContext (new HttpStandaloneContextInfo (ctx));
 196                 }
 197         }
 198
 199         internal class AspNetHttpListenerManager : HttpListenerManager
 200         {
 201                 public AspNetHttpListenerManager (Uri uri)
 202                 {
 203                 }
 204
 205                 public override void RegisterListener (ChannelDispatcher channel, HttpTransportBindingElement element, TimeSpan timeout)
 206                 {
 207                         RegisterListenerCommon (channel, timeout);
 208                 }
 209
 210                 public override void UnregisterListener (ChannelDispatcher channel, TimeSpan timeout)
 211                 {
 212                         UnregisterListenerCommon (channel, timeout);
 213                 }
 214         }
 215 }
 216