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

   1 //
   2 // System.Web.HttpRuntime.cs
   3 //
   4 // Author:
   5 //      Miguel de Icaza (miguel@novell.com)
   6 //
   7 //
   8 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 //
  31 // TODO: Call HttpRequest.CloseInputStream when we finish a request, as we are using the IntPtr stream.
  32 //
  33 using System.IO;
  34 using System.Text;
  35 using System.Globalization;
  36 using System.Collections;
  37 using System.Reflection;
  38 using System.Security;
  39 using System.Security.Permissions;
  40 using System.Web.Caching;
  41 using System.Web.Configuration;
  42 using System.Web.UI;
  43 using System.Threading;
  44
  45 #if NET_2_0 && !TARGET_JVM
  46 using System.CodeDom.Compiler;
  47 using System.Web.Compilation;
  48 #endif
  49
  50 namespace System.Web {
  51
  52         // CAS - no InheritanceDemand here as the class is sealed
  53         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  54         public sealed class HttpRuntime {
  55 #if TARGET_J2EE
  56                 static QueueManager queue_manager { get { return _runtime._queue_manager; } }
  57                 static TraceManager trace_manager { get { return _runtime._trace_manager; } }
  58                 static Cache cache { get { return _runtime._cache; } }
  59                 static WaitCallback do_RealProcessRequest;
  60
  61                 QueueManager _queue_manager;
  62                 TraceManager _trace_manager;
  63                 Cache _cache;
  64
  65                 static HttpRuntime ()
  66                 {
  67                         do_RealProcessRequest = new WaitCallback (RealProcessRequest);
  68                 }
  69
  70                 public HttpRuntime ()
  71                 {
  72                         WebConfigurationManager.Init ();
  73                         _queue_manager = new QueueManager ();
  74                         _trace_manager = new TraceManager ();
  75                         _cache = new Cache ();
  76                 }
  77
  78                 static private HttpRuntime _runtimeInstance {
  79                         get {
  80                                 HttpRuntime runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  81                                 if (runtime == null)
  82                                         lock (typeof (HttpRuntime)) {
  83                                                 runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  84                                                 if (runtime == null) {
  85                                                         runtime = new HttpRuntime ();
  86                                                         AppDomain.CurrentDomain.SetData ("HttpRuntime", runtime);
  87                                                 }
  88                                         }
  89                                 return runtime;
  90                         }
  91                 }
  92                 static private HttpRuntime _runtime
  93                 {
  94                         get
  95                         {
  96                                 if (HttpContext.Current != null)
  97                                         return HttpContext.Current.HttpRuntimeInstance;
  98                                 else
  99                                         return _runtimeInstance;
 100                         }
 101                 }
 102 #else
 103                 static QueueManager queue_manager;
 104                 static TraceManager trace_manager;
 105                 static TimeoutManager timeout_manager;
 106                 static Cache cache;
 107                 static WaitCallback do_RealProcessRequest;
 108
 109 #if NET_2_0
 110                 static bool assemblyMappingEnabled;
 111                 static object assemblyMappingLock = new object ();
 112 #endif
 113
 114                 static HttpRuntime ()
 115                 {
 116 #if NET_2_0
 117                         WebConfigurationManager.Init ();
 118 #endif
 119                         queue_manager = new QueueManager ();
 120                         trace_manager = new TraceManager ();
 121                         timeout_manager = new TimeoutManager ();
 122                         cache = new Cache ();
 123                         do_RealProcessRequest = new WaitCallback (RealProcessRequest);
 124                 }
 125
 126 #if ONLY_1_1
 127                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 128 #endif
 129                 public HttpRuntime ()
 130                 {
 131                 }
 132 #endif
 133
 134 #region AppDomain handling
 135                 //
 136                 // http://radio.weblogs.com/0105476/stories/2002/07/12/executingAspxPagesWithoutAWebServer.html
 137                 //
 138                 public static string AppDomainAppId {
 139                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 140                         get {
 141                                 //
 142                                 // This value should not change across invocations
 143                                 //
 144                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appId");
 145                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 146                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 147                                 }
 148                                 return dirname;
 149                         }
 150                 }
 151
 152                 // Physical directory for the application
 153                 public static string AppDomainAppPath {
 154                         get {
 155                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appPath");
 156                                 if (SecurityManager.SecurityEnabled) {
 157                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 158                                 }
 159                                 return dirname;
 160                         }
 161                 }
 162
 163                 public static string AppDomainAppVirtualPath {
 164                         get {
 165                                 return (string) AppDomain.CurrentDomain.GetData (".appVPath");
 166                         }
 167                 }
 168
 169                 public static string AppDomainId {
 170                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 171                         get {
 172                                 return (string) AppDomain.CurrentDomain.GetData (".domainId");
 173                         }
 174                 }
 175
 176                 public static string AspInstallDirectory {
 177                         get {
 178                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".hostingInstallDir");
 179                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 180                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 181                                 }
 182                                 return dirname;
 183                         }
 184                 }
 185 #endregion
 186
 187                 public static string BinDirectory {
 188                         get {
 189                                 string dirname = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath;
 190                                 if (SecurityManager.SecurityEnabled) {
 191                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 192                                 }
 193                                 return dirname;
 194                         }
 195                 }
 196
 197                 public static Cache Cache {
 198                         get {
 199                                 return cache;
 200                         }
 201                 }
 202
 203                 public static string ClrInstallDirectory {
 204                         get {
 205                                 string dirname = Path.GetDirectoryName (typeof (Object).Assembly.Location);
 206                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 207                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 208                                 }
 209                                 return dirname;
 210                         }
 211                 }
 212
 213                 public static string CodegenDir {
 214                         get {
 215                                 string dirname = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 216                                 if (SecurityManager.SecurityEnabled) {
 217                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 218                                 }
 219                                 return dirname;
 220                         }
 221                 }
 222
 223                 [MonoTODO]
 224                 public static bool IsOnUNCShare {
 225                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
 226                         get {
 227                                 throw new NotImplementedException ();
 228                         }
 229                 }
 230
 231                 public static string MachineConfigurationDirectory {
 232                         get {
 233 #if NET_2_0
 234                                 string dirname = Path.GetDirectoryName (WebConfigurationManager.OpenMachineConfiguration().FilePath);
 235 #else
 236                                 string dirname = Path.GetDirectoryName (WebConfigurationSettings.MachineConfigPath);
 237 #endif
 238                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 239                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 240                                 }
 241                                 return dirname;
 242                         }
 243                 }
 244
 245                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 246                 public static void Close ()
 247                 {
 248                         // Remove all items from cache.
 249                 }
 250
 251                 static void QueuePendingRequests ()
 252                 {
 253                         HttpWorkerRequest request = queue_manager.GetNextRequest (null);
 254                         if (request == null)
 255                                 return;
 256                         ThreadPool.QueueUserWorkItem (do_RealProcessRequest, request);
 257                 }
 258
 259                 static void RealProcessRequest (object o)
 260                 {
 261                         HttpContext context = new HttpContext ((HttpWorkerRequest) o);
 262                         HttpContext.Current = context;
 263
 264                         //
 265                         // Get application instance (create or reuse an instance of the correct class)
 266                         //
 267                         HttpApplication app = null;
 268                         bool error = false;
 269                         try {
 270                                 app = HttpApplicationFactory.GetApplication (context);
 271                         } catch (Exception e) {
 272                                 FinishWithException ((HttpWorkerRequest) o, new HttpException ("", e));
 273                                 error = true;
 274                         }
 275
 276                         if (error) {
 277                                 context.Request.ReleaseResources ();
 278                                 context.Response.ReleaseResources ();
 279                                 HttpContext.Current = null;
 280                         } else {
 281                                 context.ApplicationInstance = app;
 282
 283                                 //
 284                                 // Ask application to service the request
 285                                 //
 286                                 IHttpAsyncHandler ihah = app;
 287
 288                                 IAsyncResult appiar = ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 289                                 ihah.EndProcessRequest (appiar);
 290
 291                                 HttpApplicationFactory.Recycle (app);
 292                         }
 293
 294                         QueuePendingRequests ();
 295                 }
 296
 297                 //
 298                 // ProcessRequest method is executed in the AppDomain of the application
 299                 //
 300                 // Observations:
 301                 //    ProcessRequest does not guarantee that `wr' will be processed synchronously,
 302                 //    the request can be queued and processed later.
 303                 //
 304                 [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 305                 public static void ProcessRequest (HttpWorkerRequest wr)
 306                 {
 307                         if (wr == null)
 308                                 throw new ArgumentNullException ("wr");
 309                         //
 310                         // Queue our request, fetch the next available one from the queue
 311                         //
 312                         HttpWorkerRequest request = queue_manager.GetNextRequest (wr);
 313                         if (request == null)
 314                                 return;
 315
 316                         RealProcessRequest (request);
 317                 }
 318
 319                 //
 320                 // Callback to be invoked by IHttpAsyncHandler.BeginProcessRequest
 321                 //
 322                 static void request_processed (IAsyncResult iar)
 323                 {
 324                         HttpContext context = (HttpContext) iar.AsyncState;
 325
 326                         context.Request.ReleaseResources ();
 327                         context.Response.ReleaseResources ();
 328                 }
 329
 330                 //
 331                 // Called when we are shutting down or we need to reload an application
 332                 // that has been modified (touch global.asax)
 333                 //
 334                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 335                 public static void UnloadAppDomain ()
 336                 {
 337                         //
 338                         // TODO: call ReleaseResources
 339                         //
 340                         ThreadPool.QueueUserWorkItem (new WaitCallback (ShutdownAppDomain), null);
 341                 }
 342
 343                 //
 344                 // Shuts down the AppDomain
 345                 //
 346                 static void ShutdownAppDomain (object args)
 347                 {
 348                         queue_manager.Dispose ();
 349                         // This will call Session_End if needed.
 350                         Cache.InvokePrivateCallbacks ();
 351                         // Kill our application.
 352                         HttpApplicationFactory.Dispose ();
 353                         ThreadPool.QueueUserWorkItem (new WaitCallback (DoUnload), null);
 354                 }
 355
 356 #if TARGET_J2EE // No unload support for appdomains under Grasshopper
 357                 static void DoUnload (object state)
 358                 {
 359                 }
 360 #else
 361                 static void DoUnload (object state)
 362                 {
 363                         AppDomain.Unload (AppDomain.CurrentDomain);
 364                 }
 365 #endif
 366
 367                 static string content503 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" +
 368                         "<html><head>\n<title>503 Server Unavailable</title>\n</head><body>\n" +
 369                         "<h1>Server Unavailable</h1>\n" +
 370                         "</body></html>\n";
 371
 372                 static void FinishWithException (HttpWorkerRequest wr, HttpException e)
 373                 {
 374                         int code = e.GetHttpCode ();
 375                         wr.SendStatus (code, HttpWorkerRequest.GetStatusDescription (code));
 376                         wr.SendUnknownResponseHeader ("Connection", "close");
 377                         wr.SendUnknownResponseHeader ("Date", DateTime.Now.ToUniversalTime ().ToString ("r"));
 378                         Encoding enc = Encoding.ASCII;
 379                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 380                         string msg = e.GetHtmlErrorMessage ();
 381                         byte [] contentBytes = enc.GetBytes (msg);
 382                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 383                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 384                         wr.FlushResponse (true);
 385                         wr.CloseConnection ();
 386                 }
 387
 388                 //
 389                 // This is called from the QueueManager if a request
 390                 // can not be processed (load, no resources, or
 391                 // appdomain unload).
 392                 //
 393                 static internal void FinishUnavailable (HttpWorkerRequest wr)
 394                 {
 395                         wr.SendStatus (503, "Service unavailable");
 396                         wr.SendUnknownResponseHeader ("Connection", "close");
 397                         wr.SendUnknownResponseHeader ("Date", DateTime.Now.ToUniversalTime ().ToString ("r"));
 398                         Encoding enc = Encoding.ASCII;
 399                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 400                         byte [] contentBytes = enc.GetBytes (content503);
 401                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 402                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 403                         wr.FlushResponse (true);
 404                         wr.CloseConnection ();
 405                 }
 406
 407 #if NET_2_0 && !TARGET_J2EE
 408                 static internal void WritePreservationFile (Assembly asm, string genericNameBase)
 409                 {
 410                         if (asm == null)
 411                                 throw new ArgumentNullException ("asm");
 412                         if (String.IsNullOrEmpty (genericNameBase))
 413                                 throw new ArgumentNullException ("genericNameBase");
 414
 415                         string compiled = Path.Combine (AppDomain.CurrentDomain.SetupInformation.DynamicBase,
 416                                                         genericNameBase + ".compiled");
 417                         PreservationFile pf = new PreservationFile ();
 418                         try {
 419                                 pf.VirtualPath = String.Format ("/{0}/", genericNameBase);
 420
 421                                 AssemblyName an = asm.GetName ();
 422                                 pf.Assembly = an.Name;
 423                                 pf.ResultType = BuildResultTypeCode.TopLevelAssembly;
 424                                 pf.Save (compiled);
 425                         } catch (Exception ex) {
 426                                 throw new HttpException (
 427                                         String.Format ("Failed to write preservation file {0}", genericNameBase + ".compiled"),
 428                                         ex);
 429                         }
 430                 }
 431
 432                 static Assembly ResolveAssemblyHandler(object sender, ResolveEventArgs e)
 433                 {
 434                         AssemblyName an = new AssemblyName (e.Name);
 435                         string dynamic_base = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 436                         string compiled = Path.Combine (dynamic_base, an.Name + ".compiled");
 437
 438                         if (!File.Exists (compiled))
 439                                 return null;
 440
 441                         PreservationFile pf;
 442                         try {
 443                                 pf = new PreservationFile (compiled);
 444                         } catch (Exception ex) {
 445                                 throw new HttpException (
 446                                         String.Format ("Failed to read preservation file {0}", an.Name + ".compiled"),
 447                                         ex);
 448                         }
 449
 450                         Assembly ret = null;
 451                         try {
 452                                 string asmPath = Path.Combine (dynamic_base, pf.Assembly + ".dll");
 453                                 ret = Assembly.LoadFrom (asmPath);
 454                         } catch (Exception) {
 455                                 // ignore
 456                         }
 457
 458                         return ret;
 459                 }
 460
 461                 internal static void EnableAssemblyMapping (bool enable)
 462                 {
 463                         lock (assemblyMappingLock) {
 464                                 if (assemblyMappingEnabled == enable)
 465                                         return;
 466                                 if (enable)
 467                                         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler (ResolveAssemblyHandler);
 468                                 else
 469                                         AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler (ResolveAssemblyHandler);
 470                         }
 471                 }
 472 #endif
 473
 474                 internal static TraceManager TraceManager {
 475                         get {
 476                                 return trace_manager;
 477                         }
 478                 }
 479
 480 #if !TARGET_JVM
 481                 internal static TimeoutManager TimeoutManager {
 482                         get {
 483                                 return timeout_manager;
 484                         }
 485                 }
 486 #endif
 487         }
 488 }