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.Reflection;
  39 using System.Security;
  40 using System.Security.Permissions;
  41 using System.Web.Caching;
  42 using System.Web.Configuration;
  43 using System.Web.UI;
  44 using System.Web.Util;
  45 #if MONOWEB_DEP
  46 using Mono.Web.Util;
  47 #endif
  48 using System.Threading;
  49 #if TARGET_J2EE
  50 using Mainsoft.Web;
  51 #else
  52 using System.CodeDom.Compiler;
  53 using System.Web.Compilation;
  54 #endif
  55
  56 namespace System.Web
  57 {
  58         // CAS - no InheritanceDemand here as the class is sealed
  59         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  60         public sealed class HttpRuntime
  61         {
  62                 static bool caseInsensitive;
  63                 static bool runningOnWindows;
  64                 static bool isunc;
  65                 static string monoVersion;
  66
  67 #if TARGET_J2EE
  68                 static QueueManager queue_manager { get { return _runtime._queue_manager; } }
  69                 static TraceManager trace_manager { get { return _runtime._trace_manager; } }
  70                 static Cache cache { get { return _runtime._cache; } }
  71                 static Cache internalCache { get { return _runtime._internalCache; } }
  72                 static WaitCallback do_RealProcessRequest;
  73
  74                 QueueManager _queue_manager;
  75                 TraceManager _trace_manager;
  76                 Cache _cache;
  77                 Cache _internalCache;
  78
  79                 public HttpRuntime ()
  80                 {
  81                         WebConfigurationManager.Init ();
  82                         _queue_manager = new QueueManager ();
  83                         _trace_manager = new TraceManager ();
  84                         _cache = new Cache ();
  85                         _internalCache = new Cache();
  86                         _internalCache.DependencyCache = _cache;
  87                 }
  88
  89                 static HttpRuntime _runtimeInstance {
  90                         get {
  91                                 HttpRuntime runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  92                                 if (runtime == null)
  93                                         lock (typeof (HttpRuntime)) {
  94                                                 runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  95                                                 if (runtime == null) {
  96                                                         runtime = new HttpRuntime ();
  97                                                         AppDomain.CurrentDomain.SetData ("HttpRuntime", runtime);
  98                                                 }
  99                                         }
 100                                 return runtime;
 101                         }
 102                 }
 103                 static HttpRuntime _runtime
 104                 {
 105                         get
 106                         {
 107                                 if (HttpContext.Current != null)
 108                                         return HttpContext.Current.HttpRuntimeInstance;
 109                                 else
 110                                         return _runtimeInstance;
 111                         }
 112                 }
 113 #else
 114                 static QueueManager queue_manager;
 115                 static TraceManager trace_manager;
 116                 static Cache cache;
 117                 static Cache internalCache;
 118                 static WaitCallback do_RealProcessRequest;
 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
 125                 public HttpRuntime ()
 126                 {
 127
 128                 }
 129 #endif
 130
 131                 static HttpRuntime ()
 132                 {
 133                         PlatformID pid = Environment.OSVersion.Platform;
 134                         runningOnWindows = ((int) pid != 128 && pid != PlatformID.Unix && pid != PlatformID.MacOSX);
 135
 136                         if (runningOnWindows) {
 137                                 caseInsensitive = true;
 138                                 if (AppDomainAppPath != null)
 139                                         isunc = new Uri (AppDomainAppPath).IsUnc;
 140                         } else {
 141                                 string mono_iomap = Environment.GetEnvironmentVariable ("MONO_IOMAP");
 142                                 if (mono_iomap != null) {
 143                                         if (mono_iomap == "all")
 144                                                 caseInsensitive = true;
 145                                         else {
 146                                                 string[] parts = mono_iomap.Split (':');
 147                                                 foreach (string p in parts) {
 148                                                         if (p == "all" || p == "case") {
 149                                                                 caseInsensitive = true;
 150                                                                 break;
 151                                                         }
 152                                                 }
 153                                         }
 154                                 }
 155                         }
 156
 157                         Type monoRuntime = Type.GetType ("Mono.Runtime", false);
 158                         monoVersion = null;
 159                         if (monoRuntime != null) {
 160                                 MethodInfo mi = monoRuntime.GetMethod ("GetDisplayName", BindingFlags.Static | BindingFlags.NonPublic);
 161                                 if (mi != null)
 162                                         monoVersion = mi.Invoke (null, new object [0]) as string;
 163                         }
 164
 165                         if (monoVersion == null)
 166                                 monoVersion = Environment.Version.ToString ();
 167
 168 #if !TARGET_J2EE
 169                         firstRun = true;
 170                         try {
 171                                 WebConfigurationManager.Init ();
 172 #if MONOWEB_DEP
 173                                 SettingsMappingManager.Init ();
 174 #endif
 175                         } catch (Exception ex) {
 176                                 initialException = ex;
 177                         }
 178
 179                         // The classes in whose constructors exceptions may be thrown, should be handled the same way QueueManager
 180                         // and TraceManager are below. The constructors themselves MUST NOT throw any exceptions - we MUST be sure
 181                         // the objects are created here. The exceptions will be dealt with below, in RealProcessRequest.
 182                         queue_manager = new QueueManager ();
 183                         if (queue_manager.HasException)
 184                                 initialException = queue_manager.InitialException;
 185
 186                         trace_manager = new TraceManager ();
 187                         if (trace_manager.HasException)
 188                                         initialException = trace_manager.InitialException;
 189
 190                         cache = new Cache ();
 191                         internalCache = new Cache ();
 192                         internalCache.DependencyCache = internalCache;
 193 #endif
 194                         do_RealProcessRequest = new WaitCallback (RealProcessRequest);
 195                 }
 196
 197 #region AppDomain handling
 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 isunc;
 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
 330                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 331                 public static void Close ()
 332                 {
 333                         // Remove all items from cache.
 334                 }
 335
 336                 internal static HttpWorkerRequest QueuePendingRequest (bool started_internally)
 337                 {
 338                         HttpWorkerRequest next = queue_manager.GetNextRequest (null);
 339                         if (next == null)
 340                                 return null;
 341
 342                         if (!started_internally) {
 343                                 next.StartedInternally = true;
 344                                 ThreadPool.QueueUserWorkItem (do_RealProcessRequest, next);
 345                                 return null;
 346                         }
 347                         return next;
 348                 }
 349
 350 #if !TARGET_J2EE
 351                 static readonly string[] app_offline_files = {"app_offline.htm", "App_Offline.htm", "APP_OFFLINE.HTM"};
 352                 static string app_offline_file;
 353
 354                 static bool AppIsOffline (HttpContext context)
 355                 {
 356                         if (!HttpApplicationFactory.ApplicationDisabled || app_offline_file == null)
 357                                 return false;
 358
 359                         HttpResponse response = context.Response;
 360                         response.Clear ();
 361                         response.ContentType = "text/html";
 362                         response.ExpiresAbsolute = DateTime.UtcNow;
 363                         response.StatusCode = 503;
 364                         response.TransmitFile (app_offline_file, true);
 365
 366                         context.Request.ReleaseResources ();
 367                         context.Response.ReleaseResources ();
 368                         HttpContext.Current = null;
 369                         HttpApplication.requests_total_counter.Increment ();
 370
 371                         return true;
 372                 }
 373
 374                 static void AppOfflineFileRenamed (object sender, RenamedEventArgs args)
 375                 {
 376                         AppOfflineFileChanged (sender, args);
 377                 }
 378
 379                 static void AppOfflineFileChanged (object sender, FileSystemEventArgs args)
 380                 {
 381                         lock (appOfflineLock) {
 382                                 bool offline;
 383
 384                                 switch (args.ChangeType) {
 385                                         case WatcherChangeTypes.Created:
 386                                         case WatcherChangeTypes.Changed:
 387                                                 offline = true;
 388                                                 break;
 389
 390                                         case WatcherChangeTypes.Deleted:
 391                                                 offline = false;
 392                                                 break;
 393
 394                                         case WatcherChangeTypes.Renamed:
 395                                                 RenamedEventArgs rargs = args as RenamedEventArgs;
 396
 397                                                 if (rargs != null &&
 398                                                     String.Compare (rargs.Name, "app_offline.htm", StringComparison.OrdinalIgnoreCase) == 0)
 399                                                         offline = true;
 400                                                 else
 401                                                         offline = false;
 402                                                 break;
 403
 404                                         default:
 405                                                 offline = false;
 406                                                 break;
 407                                 }
 408                                 SetOfflineMode (offline, args.FullPath);
 409                         }
 410                 }
 411
 412                 static void SetOfflineMode (bool offline, string filePath)
 413                 {
 414                         if (!offline) {
 415                                 app_offline_file = null;
 416                                 if (HttpApplicationFactory.ApplicationDisabled)
 417                                         HttpRuntime.UnloadAppDomain ();
 418                         } else {
 419                                 app_offline_file = filePath;
 420                                 HttpApplicationFactory.DisableWatchers ();
 421                                 HttpApplicationFactory.ApplicationDisabled = true;
 422                                 InternalCache.InvokePrivateCallbacks ();
 423                                 HttpApplicationFactory.Dispose ();
 424                         }
 425                 }
 426
 427                 static void SetupOfflineWatch ()
 428                 {
 429                         lock (appOfflineLock) {
 430                                 FileSystemEventHandler seh = new FileSystemEventHandler (AppOfflineFileChanged);
 431                                 RenamedEventHandler reh = new RenamedEventHandler (AppOfflineFileRenamed);
 432
 433                                 string app_dir = AppDomainAppPath;
 434                                 ArrayList watchers = new ArrayList ();
 435                                 FileSystemWatcher watcher;
 436                                 string offlineFile = null, tmp;
 437
 438                                 foreach (string f in app_offline_files) {
 439                                         watcher = new FileSystemWatcher ();
 440                                         watcher.Path = Path.GetDirectoryName (app_dir);
 441                                         watcher.Filter = Path.GetFileName (f);
 442                                         watcher.NotifyFilter |= NotifyFilters.Size;
 443                                         watcher.Deleted += seh;
 444                                         watcher.Changed += seh;
 445                                         watcher.Created += seh;
 446                                         watcher.Renamed += reh;
 447                                         watcher.EnableRaisingEvents = true;
 448
 449                                         watchers.Add (watcher);
 450
 451                                         tmp = Path.Combine (app_dir, f);
 452                                         if (File.Exists (tmp))
 453                                                 offlineFile = tmp;
 454                                 }
 455
 456                                 if (offlineFile != null)
 457                                         SetOfflineMode (true, offlineFile);
 458                         }
 459                 }
 460 #endif
 461
 462                 static void RealProcessRequest (object o)
 463                 {
 464                         HttpWorkerRequest req = (HttpWorkerRequest) o;
 465                         bool started_internally = req.StartedInternally;
 466                         do {
 467                                 Process (req);
 468                                 req = QueuePendingRequest (started_internally);
 469                         } while (started_internally && req != null);
 470                 }
 471
 472                 static void Process (HttpWorkerRequest req)
 473                 {
 474 #if TARGET_J2EE
 475                         HttpContext context = HttpContext.Current;
 476                         if (context == null)
 477                                 context = new HttpContext (req);
 478                         else
 479                                 context.SetWorkerRequest (req);
 480 #else
 481                         HttpContext context = new HttpContext (req);
 482 #endif
 483                         HttpContext.Current = context;
 484                         bool error = false;
 485 #if !TARGET_J2EE
 486                         if (firstRun) {
 487                                 SetupOfflineWatch ();
 488                                 firstRun = false;
 489                                 if (initialException != null) {
 490                                         FinishWithException (req, new HttpException ("Initial exception", initialException));
 491                                         error = true;
 492                                 }
 493                         }
 494
 495                         if (AppIsOffline (context))
 496                                 return;
 497 #endif
 498
 499                         //
 500                         // Get application instance (create or reuse an instance of the correct class)
 501                         //
 502                         HttpApplication app = null;
 503                         if (!error) {
 504                                 try {
 505                                         app = HttpApplicationFactory.GetApplication (context);
 506                                 } catch (Exception e) {
 507                                         FinishWithException (req, new HttpException ("", e));
 508                                         error = true;
 509                                 }
 510                         }
 511
 512                         if (error) {
 513                                 context.Request.ReleaseResources ();
 514                                 context.Response.ReleaseResources ();
 515                                 HttpContext.Current = null;
 516                         } else {
 517                                 context.ApplicationInstance = app;
 518
 519                                 //
 520                                 // Ask application to service the request
 521                                 //
 522
 523 #if TARGET_J2EE
 524                                 IHttpAsyncHandler ihah = app;
 525                                 if (context.Handler == null)
 526                                         ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 527                                 else
 528                                         app.Tick ();
 529                                 //ihh.ProcessRequest (context);
 530                                 IHttpExtendedHandler extHandler = context.Handler as IHttpExtendedHandler;
 531                                 if (extHandler != null && !extHandler.IsCompleted)
 532                                         return;
 533                                 if (context.Error is UnifyRequestException)
 534                                         return;
 535
 536                                 ihah.EndProcessRequest (null);
 537 #else
 538                                 IHttpHandler ihh = app;
 539 //                              IAsyncResult appiar = ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 540 //                              ihah.EndProcessRequest (appiar);
 541                                 ihh.ProcessRequest (context);
 542 #endif
 543
 544                                 HttpApplicationFactory.Recycle (app);
 545                         }
 546                 }
 547
 548                 //
 549                 // ProcessRequest method is executed in the AppDomain of the application
 550                 //
 551                 // Observations:
 552                 //    ProcessRequest does not guarantee that `wr' will be processed synchronously,
 553                 //    the request can be queued and processed later.
 554                 //
 555                 [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 556                 public static void ProcessRequest (HttpWorkerRequest wr)
 557                 {
 558                         if (wr == null)
 559                                 throw new ArgumentNullException ("wr");
 560                         //
 561                         // Queue our request, fetch the next available one from the queue
 562                         //
 563                         HttpWorkerRequest request = queue_manager.GetNextRequest (wr);
 564                         if (request == null)
 565                                 return;
 566
 567                         QueuePendingRequest (false);
 568                         RealProcessRequest (request);
 569                 }
 570
 571 #if TARGET_J2EE
 572                 //
 573                 // Callback to be invoked by IHttpAsyncHandler.BeginProcessRequest
 574                 //
 575                 static void request_processed (IAsyncResult iar)
 576                 {
 577                         HttpContext context = (HttpContext) iar.AsyncState;
 578
 579                         context.Request.ReleaseResources ();
 580                         context.Response.ReleaseResources ();
 581                 }
 582 #endif
 583
 584 #if TARGET_JVM
 585                 [MonoNotSupported ("UnloadAppDomain is not supported")]
 586                 public static void UnloadAppDomain ()
 587                 {
 588                         throw new NotImplementedException ("UnloadAppDomain is not supported");
 589                 }
 590 #else
 591                 //
 592                 // Called when we are shutting down or we need to reload an application
 593                 // that has been modified (touch global.asax)
 594                 //
 595                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 596                 public static void UnloadAppDomain ()
 597                 {
 598                         //
 599                         // TODO: call ReleaseResources
 600                         //
 601                         ThreadPool.QueueUserWorkItem (new WaitCallback (ShutdownAppDomain), null);
 602                 }
 603 #endif
 604                 //
 605                 // Shuts down the AppDomain
 606                 //
 607                 static void ShutdownAppDomain (object args)
 608                 {
 609                         queue_manager.Dispose ();
 610                         // This will call Session_End if needed.
 611                         InternalCache.InvokePrivateCallbacks ();
 612                         // Kill our application.
 613                         HttpApplicationFactory.Dispose ();
 614                         ThreadPool.QueueUserWorkItem (new WaitCallback (DoUnload), null);
 615                 }
 616
 617                 static void DoUnload (object state)
 618                 {
 619 #if TARGET_J2EE
 620                         // No unload support for appdomains under Grasshopper
 621 #else
 622                         AppDomain.Unload (AppDomain.CurrentDomain);
 623 #endif
 624                 }
 625
 626                 static string content503 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" +
 627                         "<html><head>\n<title>503 Server Unavailable</title>\n</head><body>\n" +
 628                         "<h1>Server Unavailable</h1>\n" +
 629                         "</body></html>\n";
 630
 631                 static void FinishWithException (HttpWorkerRequest wr, HttpException e)
 632                 {
 633                         int code = e.GetHttpCode ();
 634                         wr.SendStatus (code, HttpWorkerRequest.GetStatusDescription (code));
 635                         wr.SendUnknownResponseHeader ("Connection", "close");
 636                         Encoding enc = Encoding.ASCII;
 637                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 638                         string msg = e.GetHtmlErrorMessage ();
 639                         byte [] contentBytes = enc.GetBytes (msg);
 640                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 641                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 642                         wr.FlushResponse (true);
 643                         wr.CloseConnection ();
 644                         HttpApplication.requests_total_counter.Increment ();
 645                 }
 646
 647                 //
 648                 // This is called from the QueueManager if a request
 649                 // can not be processed (load, no resources, or
 650                 // appdomain unload).
 651                 //
 652                 static internal void FinishUnavailable (HttpWorkerRequest wr)
 653                 {
 654                         wr.SendStatus (503, "Service unavailable");
 655                         wr.SendUnknownResponseHeader ("Connection", "close");
 656                         Encoding enc = Encoding.ASCII;
 657                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 658                         byte [] contentBytes = enc.GetBytes (content503);
 659                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 660                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 661                         wr.FlushResponse (true);
 662                         wr.CloseConnection ();
 663                         HttpApplication.requests_total_counter.Increment ();
 664                 }
 665
 666 #if !TARGET_J2EE
 667                 static internal void WritePreservationFile (Assembly asm, string genericNameBase)
 668                 {
 669                         if (asm == null)
 670                                 throw new ArgumentNullException ("asm");
 671                         if (String.IsNullOrEmpty (genericNameBase))
 672                                 throw new ArgumentNullException ("genericNameBase");
 673
 674                         string compiled = Path.Combine (AppDomain.CurrentDomain.SetupInformation.DynamicBase,
 675                                                         genericNameBase + ".compiled");
 676                         PreservationFile pf = new PreservationFile ();
 677                         try {
 678                                 pf.VirtualPath = String.Concat ("/", genericNameBase, "/");
 679
 680                                 AssemblyName an = asm.GetName ();
 681                                 pf.Assembly = an.Name;
 682                                 pf.ResultType = BuildResultTypeCode.TopLevelAssembly;
 683                                 pf.Save (compiled);
 684                         } catch (Exception ex) {
 685                                 throw new HttpException (
 686                                         String.Format ("Failed to write preservation file {0}", genericNameBase + ".compiled"),
 687                                         ex);
 688                         }
 689                 }
 690
 691                 static Assembly ResolveAssemblyHandler(object sender, ResolveEventArgs e)
 692                 {
 693                         AssemblyName an = new AssemblyName (e.Name);
 694                         string dynamic_base = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 695                         string compiled = Path.Combine (dynamic_base, an.Name + ".compiled");
 696
 697                         if (!File.Exists (compiled))
 698                                 return null;
 699
 700                         PreservationFile pf;
 701                         try {
 702                                 pf = new PreservationFile (compiled);
 703                         } catch (Exception ex) {
 704                                 throw new HttpException (
 705                                         String.Format ("Failed to read preservation file {0}", an.Name + ".compiled"),
 706                                         ex);
 707                         }
 708
 709                         Assembly ret = null;
 710                         try {
 711                                 string asmPath = Path.Combine (dynamic_base, pf.Assembly + ".dll");
 712                                 ret = Assembly.LoadFrom (asmPath);
 713                         } catch (Exception) {
 714                                 // ignore
 715                         }
 716
 717                         return ret;
 718                 }
 719
 720                 internal static void EnableAssemblyMapping (bool enable)
 721                 {
 722                         lock (assemblyMappingLock) {
 723                                 if (assemblyMappingEnabled == enable)
 724                                         return;
 725                                 if (enable)
 726                                         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler (ResolveAssemblyHandler);
 727                                 else
 728                                         AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler (ResolveAssemblyHandler);
 729                                 assemblyMappingEnabled = enable;
 730                         }
 731                 }
 732 #endif // #if !TARGET_J2EE
 733
 734                 internal static string MonoVersion {
 735                         get { return monoVersion; }
 736                 }
 737
 738                 internal static bool RunningOnWindows {
 739                         get { return runningOnWindows; }
 740                 }
 741
 742                 internal static bool CaseInsensitive {
 743                         get { return caseInsensitive; }
 744                 }
 745
 746                 internal static bool IsDebuggingEnabled {
 747                         get {
 748                                 CompilationSection cs = WebConfigurationManager.GetSection ("system.web/compilation") as CompilationSection;
 749                                 if (cs != null)
 750                                         return cs.Debug;
 751
 752                                 return false;
 753                         }
 754                 }
 755
 756                 internal static TraceManager TraceManager {
 757                         get {
 758                                 return trace_manager;
 759                         }
 760                 }
 761         }
 762 }