mcs/class/corlib/System.Runtime.Remoting.Channels/ChannelServices.cs

   1 //
   2 // System.Runtime.Remoting.Channels.ChannelServices.cs
   3 //
   4 // Author: Rodrigo Moya (rodrigo@ximian.com)
   5 //         Dietmar Maurer (dietmar@ximian.com)
   6 //         Lluis Sanchez Gual (lluis@ideary.com)
   7 //
   8 // 2002 (C) Copyright, Ximian, Inc.
   9 //
  10
  11 //
  12 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System.Collections;
  35 using System.Reflection;
  36 using System.Runtime.Remoting;
  37 using System.Runtime.Remoting.Channels;
  38 using System.Runtime.Remoting.Messaging;
  39 using System.Runtime.Remoting.Contexts;
  40
  41 namespace System.Runtime.Remoting
  42 {
  43         [Serializable]
  44         internal class ChannelInfo : IChannelInfo
  45         {
  46                 object [] channelData = null;
  47
  48                 public ChannelInfo ()
  49                 {
  50                         channelData = ChannelServices.GetCurrentChannelInfo ();
  51                 }
  52
  53                 public ChannelInfo (object remoteChannelData)
  54                 {
  55                         channelData = new object[] { remoteChannelData };
  56                 }
  57
  58                 public object[] ChannelData
  59                 {
  60                         get {
  61                                 return channelData;
  62                         }
  63
  64                         set {
  65                                 channelData = value;
  66                         }
  67                 }
  68         }
  69 }
  70
  71 namespace System.Runtime.Remoting.Channels
  72 {
  73         public sealed class ChannelServices
  74         {
  75                 private static ArrayList registeredChannels = new ArrayList ();
  76                 private static ArrayList delayedClientChannels = new ArrayList ();
  77
  78                 private static CrossContextChannel _crossContextSink = new CrossContextChannel();
  79
  80                 internal static string CrossContextUrl = "__CrossContext";
  81
  82                 private ChannelServices ()
  83                 {
  84                 }
  85
  86                 internal static CrossContextChannel CrossContextChannel
  87                 {
  88                         get { return _crossContextSink; }
  89                 }
  90
  91                 internal static IMessageSink CreateClientChannelSinkChain(string url, object remoteChannelData, out string objectUri)
  92                 {
  93                         // Locate a channel that can parse the url. This channel will be used to
  94                         // create the sink chain.
  95
  96                         object[] channelDataArray = (object[])remoteChannelData;
  97
  98                         lock (registeredChannels.SyncRoot)
  99                         {
 100                                 // First of all, try registered channels
 101                                 foreach (IChannel c in registeredChannels)
 102                                 {
 103                                         IChannelSender sender = c as IChannelSender;
 104                                         if (sender == null) continue;
 105
 106                                         IMessageSink sink = CreateClientChannelSinkChain (sender, url, channelDataArray, out objectUri);
 107                                         if (sink != null) return sink;
 108                                 }
 109
 110                                 // Not found. Try now creation delayed channels
 111                                 RemotingConfiguration.LoadDefaultDelayedChannels ();
 112                                 foreach (IChannelSender sender in delayedClientChannels)
 113                                 {
 114                                         IMessageSink sink = CreateClientChannelSinkChain (sender, url, channelDataArray, out objectUri);
 115                                         if (sink != null) {
 116                                                 delayedClientChannels.Remove (sender);
 117                                                 RegisterChannel (sender);
 118                                                 return sink;
 119                                         }
 120                                 }
 121                         }
 122
 123                         objectUri = null;
 124                         return null;
 125                 }
 126
 127                 internal static IMessageSink CreateClientChannelSinkChain (IChannelSender sender, string url, object[] channelDataArray, out string objectUri)
 128                 {
 129                         objectUri = null;
 130                         if (channelDataArray == null) {
 131                                 return sender.CreateMessageSink (url, null, out objectUri);
 132                         }
 133                         else {
 134                                 foreach (object data in channelDataArray) {
 135                                         IMessageSink sink = sender.CreateMessageSink (url, data, out objectUri);
 136                                         if (sink != null) return sink;
 137                                 }
 138                         }
 139                         return null;
 140                 }
 141
 142                 public static IChannel[] RegisteredChannels
 143                 {
 144                         get {
 145                                 lock (registeredChannels.SyncRoot)
 146                                 {
 147                                         ArrayList list = new ArrayList ();
 148
 149                                         for (int i = 0; i < registeredChannels.Count; i++) {
 150                                                 IChannel ch = (IChannel) registeredChannels[i];
 151                                                 if (ch is CrossAppDomainChannel) continue;
 152                                                 list.Add (ch);
 153                                         }
 154
 155                                         return (IChannel[]) list.ToArray (typeof(IChannel));
 156                                 }
 157                         }
 158                 }
 159
 160                 public static IServerChannelSink CreateServerChannelSinkChain (
 161                         IServerChannelSinkProvider provider, IChannelReceiver channel)
 162             {
 163                         IServerChannelSinkProvider tmp = provider;
 164                         while (tmp.Next != null) tmp = tmp.Next;
 165                         tmp.Next = new ServerDispatchSinkProvider ();
 166
 167                         // Every provider has to call CreateSink() of its next provider
 168                         return  provider.CreateSink (channel);
 169                 }
 170
 171                 public static ServerProcessing DispatchMessage (
 172                         IServerChannelSinkStack sinkStack,
 173                         IMessage msg,
 174                         out IMessage replyMsg)
 175                 {
 176                         if (msg == null) throw new ArgumentNullException ("msg");
 177
 178                         // Async processing is not done here because there isn't any way
 179                         // to know if a message is to be dispatched sync or asynchronously.
 180
 181                         replyMsg = SyncDispatchMessage (msg);
 182
 183                         if (RemotingServices.IsOneWay (((IMethodMessage) msg).MethodBase))
 184                                 return ServerProcessing.OneWay;
 185                         else
 186                                 return ServerProcessing.Complete;
 187                 }
 188
 189                 public static IChannel GetChannel (string name)
 190                 {
 191                         lock (registeredChannels.SyncRoot)
 192                         {
 193                                 foreach (IChannel chnl in registeredChannels) {
 194                                         if (chnl.ChannelName == name && !(chnl is CrossAppDomainChannel)) return chnl;
 195                                 }
 196                                 return null;
 197                         }
 198                 }
 199
 200                 public static IDictionary GetChannelSinkProperties (object obj)
 201                 {
 202                         if (!RemotingServices.IsTransparentProxy (obj))
 203                                 throw new ArgumentException ("obj must be a proxy","obj");
 204
 205                         ClientIdentity ident = (ClientIdentity) RemotingServices.GetRealProxy (obj).ObjectIdentity;
 206                         IMessageSink sink = ident.ChannelSink;
 207                         ArrayList dics = new ArrayList ();
 208
 209                         while (sink != null && !(sink is IClientChannelSink))
 210                                 sink = sink.NextSink;
 211
 212                         if (sink == null)
 213                                 return new Hashtable ();
 214
 215                         IClientChannelSink csink = sink as IClientChannelSink;
 216                         while (csink != null)
 217                         {
 218                                 dics.Add (csink.Properties);
 219                                 csink = csink.NextChannelSink;
 220                         }
 221
 222                         IDictionary[] adics = (IDictionary[]) dics.ToArray (typeof(IDictionary[]));
 223                         return new AggregateDictionary (adics);
 224                 }
 225
 226                 public static string[] GetUrlsForObject (MarshalByRefObject obj)
 227                 {
 228                         string uri = RemotingServices.GetObjectUri (obj);
 229                         if (uri == null) return new string [0];
 230
 231                         ArrayList list = new ArrayList ();
 232
 233                         lock (registeredChannels.SyncRoot)
 234                         {
 235                                 foreach (object chnl_obj in registeredChannels) {
 236                                         if (chnl_obj is CrossAppDomainChannel) continue;
 237
 238                                         IChannelReceiver chnl = chnl_obj as IChannelReceiver;
 239
 240                                         if (chnl != null)
 241                                                 list.AddRange (chnl.GetUrlsForUri (uri));
 242                                 }
 243                         }
 244
 245                         return  (string[]) list.ToArray (typeof(string));
 246                 }
 247
 248                 public static void RegisterChannel (IChannel chnl)
 249                 {
 250                         // Put the channel in the correct place according to its priority.
 251                         // Since there are not many channels, a linear search is ok.
 252
 253                         lock (registeredChannels.SyncRoot)
 254                         {
 255                                 int pos = -1;
 256                                 for (int n = 0; n < registeredChannels.Count; n++)
 257                                 {
 258                                         IChannel regc = (IChannel) registeredChannels[n];
 259
 260                                         if (regc.ChannelName == chnl.ChannelName && chnl.ChannelName != "")
 261                                                 throw new RemotingException ("Channel " + regc.ChannelName + " already registered");
 262
 263                                         if (regc.ChannelPriority < chnl.ChannelPriority && pos==-1)
 264                                                 pos = n;
 265                                 }
 266
 267                                 if (pos != -1) registeredChannels.Insert (pos, chnl);
 268                                 else registeredChannels.Add (chnl);
 269
 270                                 IChannelReceiver receiver = chnl as IChannelReceiver;
 271                                 if (receiver != null) receiver.StartListening (null);
 272                         }
 273                 }
 274
 275                 internal static void RegisterChannelConfig (ChannelData channel)
 276                 {
 277                         IServerChannelSinkProvider serverSinks = null;
 278                         IClientChannelSinkProvider clientSinks = null;
 279
 280                         // Create server providers
 281                         for (int n=channel.ServerProviders.Count-1; n>=0; n--)
 282                         {
 283                                 ProviderData prov = channel.ServerProviders[n] as ProviderData;
 284                                 IServerChannelSinkProvider sinkp = (IServerChannelSinkProvider) CreateProvider (prov);
 285                                 sinkp.Next = serverSinks;
 286                                 serverSinks = sinkp;
 287                         }
 288
 289                         // Create client providers
 290                         for (int n=channel.ClientProviders.Count-1; n>=0; n--)
 291                         {
 292                                 ProviderData prov = channel.ClientProviders[n] as ProviderData;
 293                                 IClientChannelSinkProvider sinkp = (IClientChannelSinkProvider) CreateProvider (prov);
 294                                 sinkp.Next = clientSinks;
 295                                 clientSinks = sinkp;
 296                         }
 297
 298                         // Create the channel
 299
 300                         Type type = Type.GetType (channel.Type);
 301                         if (type == null) throw new RemotingException ("Type '" + channel.Type + "' not found");
 302
 303                         Object[] parms;
 304                         Type[] signature;
 305                         bool clienc = typeof (IChannelSender).IsAssignableFrom (type);
 306                         bool serverc = typeof (IChannelReceiver).IsAssignableFrom (type);
 307
 308                         if (clienc && serverc) {
 309                                 signature = new Type [] {typeof(IDictionary), typeof(IClientChannelSinkProvider), typeof(IServerChannelSinkProvider)};
 310                                 parms = new Object[] {channel.CustomProperties, clientSinks, serverSinks};
 311                         }
 312                         else if (clienc) {
 313                                 signature = new Type [] {typeof(IDictionary), typeof(IClientChannelSinkProvider)};
 314                                 parms = new Object[] {channel.CustomProperties, clientSinks};
 315                         }
 316                         else if (serverc) {
 317                                 signature = new Type [] {typeof(IDictionary), typeof(IServerChannelSinkProvider)};
 318                                 parms = new Object[] {channel.CustomProperties, serverSinks};
 319                         }
 320                         else
 321                                 throw new RemotingException (type + " is not a valid channel type");
 322
 323                         ConstructorInfo ctor = type.GetConstructor (signature);
 324                         if (ctor == null)
 325                                 throw new RemotingException (type + " does not have a valid constructor");
 326
 327                         IChannel ch;
 328                         try
 329                         {
 330                                 ch = (IChannel) ctor.Invoke (parms);
 331                         }
 332                         catch (TargetInvocationException ex)
 333                         {
 334                                 throw ex.InnerException;
 335                         }
 336
 337                         lock (registeredChannels.SyncRoot)
 338                         {
 339                                 if (channel.DelayLoadAsClientChannel == "true" && !(ch is IChannelReceiver))
 340                                         delayedClientChannels.Add (ch);
 341                                 else
 342                                         RegisterChannel (ch);
 343                         }
 344                 }
 345
 346                 static object CreateProvider (ProviderData prov)
 347                 {
 348                         Type pvtype = Type.GetType (prov.Type);
 349                         if (pvtype == null) throw new RemotingException ("Type '" + prov.Type + "' not found");
 350                         Object[] pvparms = new Object[] {prov.CustomProperties, prov.CustomData};
 351
 352                         try
 353                         {
 354                                 return Activator.CreateInstance (pvtype, pvparms);
 355                         }
 356                         catch (Exception ex)
 357                         {
 358                                 if (ex is TargetInvocationException) ex = ((TargetInvocationException)ex).InnerException;
 359                                 throw new RemotingException ("An instance of provider '" + pvtype + "' could not be created: " + ex.Message);
 360                         }
 361                 }
 362
 363                 public static IMessage SyncDispatchMessage (IMessage msg)
 364                 {
 365                         IMessage ret = CheckIncomingMessage (msg);
 366                         if (ret != null) return CheckReturnMessage (msg, ret);
 367                         ret = _crossContextSink.SyncProcessMessage (msg);
 368                         return CheckReturnMessage (msg, ret);
 369                 }
 370
 371                 public static IMessageCtrl AsyncDispatchMessage (IMessage msg, IMessageSink replySink)
 372                 {
 373                         IMessage ret = CheckIncomingMessage (msg);
 374                         if (ret != null) {
 375                                 replySink.SyncProcessMessage (CheckReturnMessage (msg, ret));
 376                                 return null;
 377                         }
 378
 379 #if NET_1_1
 380                         if (RemotingConfiguration.CustomErrorsEnabled (IsLocalCall (msg)))
 381                                 replySink = new ExceptionFilterSink (msg, replySink);
 382 #endif
 383
 384                         return _crossContextSink.AsyncProcessMessage (msg, replySink);
 385                 }
 386
 387                 static ReturnMessage CheckIncomingMessage (IMessage msg)
 388                 {
 389                         IMethodMessage call = (IMethodMessage)msg;
 390                         ServerIdentity identity = RemotingServices.GetIdentityForUri (call.Uri) as ServerIdentity;
 391
 392                         if (identity == null)
 393                                 return new ReturnMessage (new RemotingException ("No receiver for uri " + call.Uri), (IMethodCallMessage) msg);
 394
 395                         RemotingServices.SetMessageTargetIdentity (msg, identity);
 396                         return null;
 397                 }
 398
 399                 internal static IMessage CheckReturnMessage (IMessage callMsg, IMessage retMsg)
 400                 {
 401 #if NET_1_1
 402                         IMethodReturnMessage ret = retMsg as IMethodReturnMessage;
 403                         if (ret != null && ret.Exception != null)
 404                         {
 405                                 if (RemotingConfiguration.CustomErrorsEnabled (IsLocalCall (callMsg)))
 406                                 {
 407                                         Exception ex = new Exception ("Server encountered an internal error. For more information, turn off customErrors in the server's .config file.");
 408                                         retMsg = new MethodResponse (ex, (IMethodCallMessage)callMsg);
 409                                 }
 410                         }
 411 #endif
 412                         return retMsg;
 413                 }
 414
 415                 static bool IsLocalCall (IMessage callMsg)
 416                 {
 417                         return true;
 418
 419 /*                      How can I know if a call is local?!?
 420
 421                         object isLocal = callMsg.Properties ["__isLocalCall"];
 422                         if (isLocal == null) return false;
 423                         return (bool)isLocal;
 424 */
 425                 }
 426
 427                 public static void UnregisterChannel (IChannel chnl)
 428                 {
 429                         if (chnl == null)
 430                                 throw new ArgumentNullException ();
 431
 432                         lock (registeredChannels.SyncRoot)
 433                         {
 434                                 for (int n=0; n<registeredChannels.Count; n++)
 435                                 {
 436                                         if (registeredChannels [n] == (object)chnl) {
 437                                                 registeredChannels.RemoveAt (n);
 438                                                 IChannelReceiver chnlReceiver = chnl as IChannelReceiver;
 439                                                 if(chnlReceiver != null)
 440                                                         chnlReceiver.StopListening(null);
 441                                                 return;
 442                                         }
 443                                 }
 444
 445                                 throw new RemotingException ("Channel not registered");
 446
 447                         }
 448                 }
 449
 450                 internal static object [] GetCurrentChannelInfo ()
 451                 {
 452                         ArrayList list = new ArrayList ();
 453
 454                         lock (registeredChannels.SyncRoot)
 455                         {
 456                                 foreach (object chnl_obj in registeredChannels) {
 457                                         IChannelReceiver chnl = chnl_obj as IChannelReceiver;
 458
 459                                         if (chnl != null) {
 460                                                 object chnl_data = chnl.ChannelData;
 461                                                 if (chnl_data != null)
 462                                                         list.Add (chnl_data);
 463                                         }
 464                                 }
 465                         }
 466
 467                         return  list.ToArray ();
 468                 }
 469         }
 470
 471         internal class ExceptionFilterSink: IMessageSink
 472         {
 473                 IMessageSink _next;
 474                 IMessage _call;
 475
 476                 public ExceptionFilterSink (IMessage call, IMessageSink next)
 477                 {
 478                         _call = call;
 479                         _next = next;
 480                 }
 481
 482                 public IMessage SyncProcessMessage (IMessage msg)
 483                 {
 484                         return _next.SyncProcessMessage (ChannelServices.CheckReturnMessage (_call, msg));
 485                 }
 486
 487                 public IMessageCtrl AsyncProcessMessage (IMessage msg, IMessageSink replySink)
 488                 {
 489                         throw new InvalidOperationException();
 490                 }
 491
 492                 public IMessageSink NextSink
 493                 {
 494                         get { return _next; }
 495                 }
 496         }
 497 }