mcs/class/System.Web/System.Web/HttpRuntime.cs

   1 //
   2 // System.Web.HttpRuntime.cs
   3 //
   4 // Authors:
   5 //      Miguel de Icaza (miguel@novell.com)
   6 //      Marek Habersack <mhabersack@novell.com>
   7 //
   8 //
   9 // Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 //
  32 // TODO: Call HttpRequest.CloseInputStream when we finish a request, as we are using the IntPtr stream.
  33 //
  34 using System.IO;
  35 using System.Text;
  36 using System.Globalization;
  37 using System.Collections;
  38 using System.Collections.Concurrent;
  39 using System.Reflection;
  40 using System.Security;
  41 using System.Security.Permissions;
  42 using System.Web.Caching;
  43 using System.Web.Configuration;
  44 using System.Web.Management;
  45 using System.Web.UI;
  46 using System.Web.Util;
  47 #if MONOWEB_DEP
  48 using Mono.Web.Util;
  49 #endif
  50 using System.Threading;
  51 #if TARGET_J2EE
  52 using Mainsoft.Web;
  53 #else
  54 using System.CodeDom.Compiler;
  55 using System.Web.Compilation;
  56 #endif
  57
  58 namespace System.Web
  59 {
  60         // CAS - no InheritanceDemand here as the class is sealed
  61         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  62         public sealed class HttpRuntime
  63         {
  64                 static bool domainUnloading;
  65                 static SplitOrderedList <string, string> registeredAssemblies;
  66 #if TARGET_J2EE
  67                 static QueueManager queue_manager { get { return _runtime._queue_manager; } }
  68                 static TraceManager trace_manager { get { return _runtime._trace_manager; } }
  69                 static Cache cache { get { return _runtime._cache; } }
  70                 static Cache internalCache { get { return _runtime._internalCache; } }
  71                 static WaitCallback do_RealProcessRequest;
  72
  73                 QueueManager _queue_manager;
  74                 TraceManager _trace_manager;
  75                 Cache _cache;
  76                 Cache _internalCache;
  77
  78                 public HttpRuntime ()
  79                 {
  80                         WebConfigurationManager.Init ();
  81                         _queue_manager = new QueueManager ();
  82                         _trace_manager = new TraceManager ();
  83                         _cache = new Cache ();
  84                         _internalCache = new Cache();
  85                         _internalCache.DependencyCache = _cache;
  86                 }
  87
  88                 static HttpRuntime _runtimeInstance {
  89                         get {
  90                                 HttpRuntime runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  91                                 if (runtime == null)
  92                                         lock (typeof (HttpRuntime)) {
  93                                                 runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  94                                                 if (runtime == null) {
  95                                                         runtime = new HttpRuntime ();
  96                                                         AppDomain.CurrentDomain.SetData ("HttpRuntime", runtime);
  97                                                 }
  98                                         }
  99                                 return runtime;
 100                         }
 101                 }
 102                 static HttpRuntime _runtime
 103                 {
 104                         get
 105                         {
 106                                 if (HttpContext.Current != null)
 107                                         return HttpContext.Current.HttpRuntimeInstance;
 108                                 else
 109                                         return _runtimeInstance;
 110                         }
 111                 }
 112 #else
 113                 static QueueManager queue_manager;
 114                 static TraceManager trace_manager;
 115                 static Cache cache;
 116                 static Cache internalCache;
 117                 static WaitCallback do_RealProcessRequest;
 118                 static HttpWorkerRequest.EndOfSendNotification end_of_send_cb;
 119                 static Exception initialException;
 120                 static bool firstRun;
 121                 static bool assemblyMappingEnabled;
 122                 static object assemblyMappingLock = new object ();
 123                 static object appOfflineLock = new object ();
 124                 static HttpRuntimeSection runtime_section;
 125
 126                 public HttpRuntime ()
 127                 {
 128
 129                 }
 130 #endif
 131
 132                 static HttpRuntime ()
 133                 {
 134 #if !TARGET_J2EE
 135                         firstRun = true;
 136
 137                         try {
 138                                 WebConfigurationManager.Init ();
 139 #if MONOWEB_DEP
 140                                 SettingsMappingManager.Init ();
 141 #endif
 142                                 runtime_section = (HttpRuntimeSection) WebConfigurationManager.GetSection ("system.web/httpRuntime");
 143                         } catch (Exception ex) {
 144                                 initialException = ex;
 145                         }
 146
 147                         // The classes in whose constructors exceptions may be thrown, should be handled the same way QueueManager
 148                         // and TraceManager are below. The constructors themselves MUST NOT throw any exceptions - we MUST be sure
 149                         // the objects are created here. The exceptions will be dealt with below, in RealProcessRequest.
 150                         queue_manager = new QueueManager ();
 151                         if (queue_manager.HasException) {
 152                                 if (initialException == null)
 153                                         initialException = queue_manager.InitialException;
 154                                 else {
 155                                         Console.Error.WriteLine ("Exception during QueueManager initialization:");
 156                                         Console.Error.WriteLine (queue_manager.InitialException);
 157                                 }
 158                         }
 159
 160                         trace_manager = new TraceManager ();
 161                         if (trace_manager.HasException) {
 162                                 if (initialException == null)
 163                                         initialException = trace_manager.InitialException;
 164                                 else {
 165                                         Console.Error.WriteLine ("Exception during TraceManager initialization:");
 166                                         Console.Error.WriteLine (trace_manager.InitialException);
 167                                 }
 168                         }
 169
 170                         registeredAssemblies = new SplitOrderedList <string, string> (StringComparer.Ordinal);
 171                         cache = new Cache ();
 172                         internalCache = new Cache ();
 173                         internalCache.DependencyCache = internalCache;
 174 #endif
 175                         do_RealProcessRequest = new WaitCallback (state => {
 176                                 try {
 177                                         RealProcessRequest (state);
 178                                 } catch {}
 179                                 });
 180                         end_of_send_cb = new HttpWorkerRequest.EndOfSendNotification (EndOfSend);
 181                 }
 182
 183                 internal static SplitOrderedList <string, string> RegisteredAssemblies {
 184                         get { return registeredAssemblies; }
 185                 }
 186
 187 #region AppDomain handling
 188                 internal static bool DomainUnloading {
 189                         get { return domainUnloading; }
 190                 }
 191
 192                 [MonoDocumentationNote ("Currently returns path to the application root")]
 193                 public static string AspClientScriptPhysicalPath { get { return AppDomainAppPath; } }
 194
 195                 [MonoDocumentationNote ("Currently returns path to the application root")]
 196                 public static string AspClientScriptVirtualPath { get { return AppDomainAppVirtualPath; } }
 197
 198                 //
 199                 // http://radio.weblogs.com/0105476/stories/2002/07/12/executingAspxPagesWithoutAWebServer.html
 200                 //
 201                 public static string AppDomainAppId {
 202                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 203                         get {
 204                                 //
 205                                 // This value should not change across invocations
 206                                 //
 207                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appId");
 208                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 209                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 210                                 }
 211                                 return dirname;
 212                         }
 213                 }
 214
 215                 // Physical directory for the application
 216                 public static string AppDomainAppPath {
 217                         get {
 218                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appPath");
 219                                 if (SecurityManager.SecurityEnabled) {
 220                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 221                                 }
 222                                 return dirname;
 223                         }
 224                 }
 225
 226                 public static string AppDomainAppVirtualPath {
 227                         get {
 228                                 return (string) AppDomain.CurrentDomain.GetData (".appVPath");
 229                         }
 230                 }
 231
 232                 public static string AppDomainId {
 233                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 234                         get {
 235                                 return (string) AppDomain.CurrentDomain.GetData (".domainId");
 236                         }
 237                 }
 238
 239                 public static string AspInstallDirectory {
 240                         get {
 241                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".hostingInstallDir");
 242                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 243                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 244                                 }
 245                                 return dirname;
 246                         }
 247                 }
 248 #endregion
 249
 250                 static string _actual_bin_directory;
 251                 public static string BinDirectory {
 252                         get {
 253                                 if (_actual_bin_directory == null) {
 254                                         string[] parts = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath.Split (';');
 255                                         string mypath = AppDomainAppPath;
 256                                         string tmp;
 257
 258                                         foreach (string p in parts) {
 259                                                 tmp = Path.Combine (mypath, p);
 260                                                 if (Directory.Exists (tmp)) {
 261                                                         _actual_bin_directory = tmp;
 262                                                         break;
 263                                                 }
 264                                         }
 265
 266                                         if (_actual_bin_directory == null)
 267                                                 _actual_bin_directory = Path.Combine (mypath, "bin");
 268
 269                                         if (_actual_bin_directory [_actual_bin_directory.Length - 1] != Path.DirectorySeparatorChar)
 270                                                 _actual_bin_directory += Path.DirectorySeparatorChar;
 271                                 }
 272
 273                                 if (SecurityManager.SecurityEnabled)
 274                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, _actual_bin_directory).Demand ();
 275
 276                                 return _actual_bin_directory;
 277                         }
 278                 }
 279
 280                 public static Cache Cache {
 281                         get {
 282                                 return cache;
 283                         }
 284                 }
 285
 286                 internal static Cache InternalCache {
 287                         get {
 288                                 return internalCache;
 289                         }
 290                 }
 291
 292                 public static string ClrInstallDirectory {
 293                         get {
 294                                 string dirname = Path.GetDirectoryName (typeof (Object).Assembly.Location);
 295                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 296                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 297                                 }
 298                                 return dirname;
 299                         }
 300                 }
 301
 302                 public static string CodegenDir {
 303                         get {
 304                                 string dirname = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 305                                 if (SecurityManager.SecurityEnabled) {
 306                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 307                                 }
 308                                 return dirname;
 309                         }
 310                 }
 311
 312                 public static bool IsOnUNCShare {
 313                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
 314                         get {
 315                                 return RuntimeHelpers.IsUncShare;
 316                         }
 317                 }
 318
 319                 public static string MachineConfigurationDirectory {
 320                         get {
 321                                 string dirname = Path.GetDirectoryName (ICalls.GetMachineConfigPath ());
 322                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 323                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 324                                 }
 325                                 return dirname;
 326                         }
 327                 }
 328
 329                 internal static HttpRuntimeSection Section { get { return runtime_section; } }
 330
 331                 public static bool UsingIntegratedPipeline { get { return false; } }
 332
 333 #if NET_4_5
 334                 public static IISVersion {
 335                         get { return null; } // Null means not hosted by IIS
 336                 }
 337 #endif
 338
 339                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 340                 public static void Close ()
 341                 {
 342                         // Remove all items from cache.
 343                 }
 344
 345                 internal static HttpWorkerRequest QueuePendingRequest (bool started_internally)
 346                 {
 347                         HttpWorkerRequest next = queue_manager.GetNextRequest (null);
 348                         if (next == null)
 349                                 return null;
 350
 351                         if (!started_internally) {
 352                                 next.StartedInternally = true;
 353                                 ThreadPool.QueueUserWorkItem (do_RealProcessRequest, next);
 354                                 return null;
 355                         }
 356                         return next;
 357                 }
 358
 359 #if !TARGET_J2EE
 360                 static readonly string[] app_offline_files = {"app_offline.htm", "App_Offline.htm", "APP_OFFLINE.HTM"};
 361                 static string app_offline_file;
 362
 363                 static bool AppIsOffline (HttpContext context)
 364                 {
 365                         if (!HttpApplicationFactory.ApplicationDisabled || app_offline_file == null)
 366                                 return false;
 367
 368                         HttpResponse response = context.Response;
 369                         response.Clear ();
 370                         response.ContentType = "text/html";
 371                         response.ExpiresAbsolute = DateTime.UtcNow;
 372                         response.StatusCode = 503;
 373                         response.TransmitFile (app_offline_file, true);
 374
 375                         context.Request.ReleaseResources ();
 376                         context.Response.ReleaseResources ();
 377                         HttpContext.Current = null;
 378                         HttpApplication.requests_total_counter.Increment ();
 379
 380                         return true;
 381                 }
 382
 383                 static void AppOfflineFileRenamed (object sender, RenamedEventArgs args)
 384                 {
 385                         AppOfflineFileChanged (sender, args);
 386                 }
 387
 388                 static void AppOfflineFileChanged (object sender, FileSystemEventArgs args)
 389                 {
 390                         lock (appOfflineLock) {
 391                                 bool offline;
 392
 393                                 switch (args.ChangeType) {
 394                                         case WatcherChangeTypes.Created:
 395                                         case WatcherChangeTypes.Changed:
 396                                                 offline = true;
 397                                                 break;
 398
 399                                         case WatcherChangeTypes.Deleted:
 400                                                 offline = false;
 401                                                 break;
 402
 403                                         case WatcherChangeTypes.Renamed:
 404                                                 RenamedEventArgs rargs = args as RenamedEventArgs;
 405
 406                                                 if (rargs != null &&
 407                                                     String.Compare (rargs.Name, "app_offline.htm", StringComparison.OrdinalIgnoreCase) == 0)
 408                                                         offline = true;
 409                                                 else
 410                                                         offline = false;
 411                                                 break;
 412
 413                                         default:
 414                                                 offline = false;
 415                                                 break;
 416                                 }
 417                                 SetOfflineMode (offline, args.FullPath);
 418                         }
 419                 }
 420
 421                 static void SetOfflineMode (bool offline, string filePath)
 422                 {
 423                         if (!offline) {
 424                                 app_offline_file = null;
 425                                 if (HttpApplicationFactory.ApplicationDisabled)
 426                                         HttpRuntime.UnloadAppDomain ();
 427                         } else {
 428                                 app_offline_file = filePath;
 429                                 HttpApplicationFactory.DisableWatchers ();
 430                                 HttpApplicationFactory.ApplicationDisabled = true;
 431                                 InternalCache.InvokePrivateCallbacks ();
 432                                 HttpApplicationFactory.Dispose ();
 433                         }
 434                 }
 435
 436                 static void SetupOfflineWatch ()
 437                 {
 438                         lock (appOfflineLock) {
 439                                 FileSystemEventHandler seh = new FileSystemEventHandler (AppOfflineFileChanged);
 440                                 RenamedEventHandler reh = new RenamedEventHandler (AppOfflineFileRenamed);
 441
 442                                 string app_dir = AppDomainAppPath;
 443                                 FileSystemWatcher watcher;
 444                                 string offlineFile = null, tmp;
 445
 446                                 foreach (string f in app_offline_files) {
 447                                         watcher = new FileSystemWatcher ();
 448                                         watcher.Path = Path.GetDirectoryName (app_dir);
 449                                         watcher.Filter = Path.GetFileName (f);
 450                                         watcher.NotifyFilter |= NotifyFilters.Size;
 451                                         watcher.Deleted += seh;
 452                                         watcher.Changed += seh;
 453                                         watcher.Created += seh;
 454                                         watcher.Renamed += reh;
 455                                         watcher.EnableRaisingEvents = true;
 456
 457                                         tmp = Path.Combine (app_dir, f);
 458                                         if (File.Exists (tmp))
 459                                                 offlineFile = tmp;
 460                                 }
 461
 462                                 if (offlineFile != null)
 463                                         SetOfflineMode (true, offlineFile);
 464                         }
 465                 }
 466 #endif
 467
 468                 static void RealProcessRequest (object o)
 469                 {
 470                         if (domainUnloading) {
 471                                 Console.Error.WriteLine ("Domain is unloading, not processing the request.");
 472                                 return;
 473                         }
 474
 475                         HttpWorkerRequest req = (HttpWorkerRequest) o;
 476                         bool started_internally = req.StartedInternally;
 477                         do {
 478                                 Process (req);
 479                                 req = QueuePendingRequest (started_internally);
 480                         } while (started_internally && req != null);
 481                 }
 482
 483                 static void Process (HttpWorkerRequest req)
 484                 {
 485                         bool error = false;
 486 #if TARGET_J2EE
 487                         HttpContext context = HttpContext.Current;
 488                         if (context == null)
 489                                 context = new HttpContext (req);
 490                         else
 491                                 context.SetWorkerRequest (req);
 492 #else
 493                         if (firstRun) {
 494                                 firstRun = false;
 495                                 if (initialException != null) {
 496                                         FinishWithException (req, HttpException.NewWithCode ("Initial exception", initialException, WebEventCodes.RuntimeErrorRequestAbort));
 497                                         error = true;
 498                                 }
 499                                 SetupOfflineWatch ();
 500                         }
 501                         HttpContext context = new HttpContext (req);
 502 #endif
 503                         HttpContext.Current = context;
 504 #if !TARGET_J2EE
 505                         if (AppIsOffline (context))
 506                                 return;
 507 #endif
 508
 509                         //
 510                         // Get application instance (create or reuse an instance of the correct class)
 511                         //
 512                         HttpApplication app = null;
 513                         if (!error) {
 514                                 try {
 515                                         app = HttpApplicationFactory.GetApplication (context);
 516                                 } catch (Exception e) {
 517                                         FinishWithException (req, HttpException.NewWithCode (String.Empty, e, WebEventCodes.RuntimeErrorRequestAbort));
 518                                         error = true;
 519                                 }
 520                         }
 521
 522                         if (error) {
 523                                 context.Request.ReleaseResources ();
 524                                 context.Response.ReleaseResources ();
 525                                 HttpContext.Current = null;
 526                         } else {
 527                                 context.ApplicationInstance = app;
 528                                 req.SetEndOfSendNotification (end_of_send_cb, context);
 529
 530                                 //
 531                                 // Ask application to service the request
 532                                 //
 533
 534 #if TARGET_J2EE
 535                                 IHttpAsyncHandler ihah = app;
 536                                 if (context.Handler == null)
 537                                         ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 538                                 else
 539                                         app.Tick ();
 540                                 //ihh.ProcessRequest (context);
 541                                 IHttpExtendedHandler extHandler = context.Handler as IHttpExtendedHandler;
 542                                 if (extHandler != null && !extHandler.IsCompleted)
 543                                         return;
 544                                 if (context.Error is UnifyRequestException)
 545                                         return;
 546
 547                                 ihah.EndProcessRequest (null);
 548 #else
 549                                 IHttpHandler ihh = app;
 550 //                              IAsyncResult appiar = ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 551 //                              ihah.EndProcessRequest (appiar);
 552                                 ihh.ProcessRequest (context);
 553 #endif
 554
 555                                 HttpApplicationFactory.Recycle (app);
 556                         }
 557                 }
 558
 559                 static void EndOfSend (HttpWorkerRequest ignored1, object ignored2)
 560                 {
 561                 }
 562
 563                 //
 564                 // ProcessRequest method is executed in the AppDomain of the application
 565                 //
 566                 // Observations:
 567                 //    ProcessRequest does not guarantee that `wr' will be processed synchronously,
 568                 //    the request can be queued and processed later.
 569                 //
 570                 [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 571                 public static void ProcessRequest (HttpWorkerRequest wr)
 572                 {
 573                         if (wr == null)
 574                                 throw new ArgumentNullException ("wr");
 575                         //
 576                         // Queue our request, fetch the next available one from the queue
 577                         //
 578                         HttpWorkerRequest request = queue_manager.GetNextRequest (wr);
 579                         if (request == null)
 580                                 return;
 581
 582                         QueuePendingRequest (false);
 583                         RealProcessRequest (request);
 584                 }
 585
 586 #if TARGET_J2EE
 587                 //
 588                 // Callback to be invoked by IHttpAsyncHandler.BeginProcessRequest
 589                 //
 590                 static void request_processed (IAsyncResult iar)
 591                 {
 592                         HttpContext context = (HttpContext) iar.AsyncState;
 593
 594                         context.Request.ReleaseResources ();
 595                         context.Response.ReleaseResources ();
 596                 }
 597 #endif
 598
 599 #if TARGET_JVM
 600                 [MonoNotSupported ("UnloadAppDomain is not supported")]
 601                 public static void UnloadAppDomain ()
 602                 {
 603                         throw new NotImplementedException ("UnloadAppDomain is not supported");
 604                 }
 605 #else
 606                 //
 607                 // Called when we are shutting down or we need to reload an application
 608                 // that has been modified (touch global.asax)
 609                 //
 610                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 611                 public static void UnloadAppDomain ()
 612                 {
 613                         //
 614                         // TODO: call ReleaseResources
 615                         //
 616                         domainUnloading = true;
 617                         HttpApplicationFactory.DisableWatchers ();
 618                         ThreadPool.QueueUserWorkItem (delegate {
 619                                 try {
 620                                         ShutdownAppDomain ();
 621                                 } catch (Exception e){
 622                                         Console.Error.WriteLine (e);
 623                                 }
 624                         });
 625                 }
 626 #endif
 627                 //
 628                 // Shuts down the AppDomain
 629                 //
 630                 static void ShutdownAppDomain ()
 631                 {
 632                         queue_manager.Dispose ();
 633                         // This will call Session_End if needed.
 634                         InternalCache.InvokePrivateCallbacks ();
 635                         // Kill our application.
 636                         HttpApplicationFactory.Dispose ();
 637                         ThreadPool.QueueUserWorkItem (delegate {
 638                                 try {
 639                                         DoUnload ();
 640                                 } catch {
 641                                 }});
 642                 }
 643
 644                 static void DoUnload ()
 645                 {
 646 #if TARGET_J2EE
 647                         // No unload support for appdomains under Grasshopper
 648 #else
 649                         AppDomain.Unload (AppDomain.CurrentDomain);
 650 #endif
 651                 }
 652
 653                 static string content503 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" +
 654                         "<html><head>\n<title>503 Server Unavailable</title>\n</head><body>\n" +
 655                         "<h1>Server Unavailable</h1>\n" +
 656                         "</body></html>\n";
 657
 658                 static void FinishWithException (HttpWorkerRequest wr, HttpException e)
 659                 {
 660                         int code = e.GetHttpCode ();
 661                         wr.SendStatus (code, HttpWorkerRequest.GetStatusDescription (code));
 662                         wr.SendUnknownResponseHeader ("Connection", "close");
 663                         Encoding enc = Encoding.ASCII;
 664                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 665                         string msg = e.GetHtmlErrorMessage ();
 666                         byte [] contentBytes = enc.GetBytes (msg);
 667                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 668                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 669                         wr.FlushResponse (true);
 670                         wr.CloseConnection ();
 671                         HttpApplication.requests_total_counter.Increment ();
 672                 }
 673
 674                 //
 675                 // This is called from the QueueManager if a request
 676                 // can not be processed (load, no resources, or
 677                 // appdomain unload).
 678                 //
 679                 static internal void FinishUnavailable (HttpWorkerRequest wr)
 680                 {
 681                         wr.SendStatus (503, "Service unavailable");
 682                         wr.SendUnknownResponseHeader ("Connection", "close");
 683                         Encoding enc = Encoding.ASCII;
 684                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 685                         byte [] contentBytes = enc.GetBytes (content503);
 686                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 687                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 688                         wr.FlushResponse (true);
 689                         wr.CloseConnection ();
 690                         HttpApplication.requests_total_counter.Increment ();
 691                 }
 692
 693                 [AspNetHostingPermissionAttribute(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Unrestricted)]
 694                 [MonoDocumentationNote ("Always returns null on Mono")]
 695                 public static NamedPermissionSet GetNamedPermissionSet ()
 696                 {
 697                         return null;
 698                 }
 699
 700 #if !TARGET_J2EE
 701                 static internal void WritePreservationFile (Assembly asm, string genericNameBase)
 702                 {
 703                         if (asm == null)
 704                                 throw new ArgumentNullException ("asm");
 705                         if (String.IsNullOrEmpty (genericNameBase))
 706                                 throw new ArgumentNullException ("genericNameBase");
 707
 708                         string compiled = Path.Combine (AppDomain.CurrentDomain.SetupInformation.DynamicBase,
 709                                                         genericNameBase + ".compiled");
 710                         PreservationFile pf = new PreservationFile ();
 711                         try {
 712                                 pf.VirtualPath = String.Concat ("/", genericNameBase, "/");
 713
 714                                 AssemblyName an = asm.GetName ();
 715                                 pf.Assembly = an.Name;
 716                                 pf.ResultType = BuildResultTypeCode.TopLevelAssembly;
 717                                 pf.Save (compiled);
 718                         } catch (Exception ex) {
 719                                 throw new HttpException (
 720                                         String.Format ("Failed to write preservation file {0}", genericNameBase + ".compiled"),
 721                                         ex);
 722                         }
 723                 }
 724
 725                 static Assembly ResolveAssemblyHandler(object sender, ResolveEventArgs e)
 726                 {
 727                         AssemblyName an = new AssemblyName (e.Name);
 728                         string dynamic_base = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 729                         string compiled = Path.Combine (dynamic_base, an.Name + ".compiled");
 730                         string asmPath;
 731
 732                         if (!File.Exists (compiled)) {
 733                                 string fn = an.FullName;
 734                                 if (!RegisteredAssemblies.Find ((uint)fn.GetHashCode (), fn, out asmPath))
 735                                         return null;
 736                         } else {
 737                                 PreservationFile pf;
 738                                 try {
 739                                         pf = new PreservationFile (compiled);
 740                                 } catch (Exception ex) {
 741                                         throw new HttpException (
 742                                                 String.Format ("Failed to read preservation file {0}", an.Name + ".compiled"),
 743                                                 ex);
 744                                 }
 745                                 asmPath = Path.Combine (dynamic_base, pf.Assembly + ".dll");
 746                         }
 747
 748                         if (String.IsNullOrEmpty (asmPath))
 749                                 return null;
 750
 751                         Assembly ret = null;
 752                         try {
 753                                 ret = Assembly.LoadFrom (asmPath);
 754                         } catch (Exception) {
 755                                 // ignore
 756                         }
 757
 758                         return ret;
 759                 }
 760
 761                 internal static void EnableAssemblyMapping (bool enable)
 762                 {
 763                         lock (assemblyMappingLock) {
 764                                 if (assemblyMappingEnabled == enable)
 765                                         return;
 766                                 if (enable)
 767                                         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler (ResolveAssemblyHandler);
 768                                 else
 769                                         AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler (ResolveAssemblyHandler);
 770                                 assemblyMappingEnabled = enable;
 771                         }
 772                 }
 773 #endif // #if !TARGET_J2EE
 774
 775                 internal static TraceManager TraceManager {
 776                         get {
 777                                 return trace_manager;
 778                         }
 779                 }
 780         }
 781 }