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