mcs/class/System.Web/System.Web.SessionState/SessionSQLServerHandler.cs

   1 //
   2 // System.Web.SessionState.SessionSQLServerHandler
   3 //
   4 // Author(s):
   5 //  Jackson Harper (jackson@ximian.com)
   6 //
   7 // (C) 2003 Novell, Inc. (http://www.novell.com), All rights reserved
   8 //
   9
  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 #if !NET_2_0
  31 using System;
  32 using System.IO;
  33 using System.Data;
  34 using System.Reflection;
  35 using System.Configuration;
  36 using System.Collections.Specialized;
  37 using System.Web.Configuration;
  38
  39 namespace System.Web.SessionState {
  40
  41         internal class SessionSQLServerHandler : ISessionHandler
  42         {
  43                 private static Type cncType = null;
  44                 private IDbConnection cnc = null;
  45                 private SessionConfig config;
  46                 private string AppPath = String.Empty;
  47
  48                 const string defaultParamPrefix = ":";
  49                 string paramPrefix;
  50                 string selectCommandText = "SELECT timeout,staticobjectsdata,sessiondata FROM ASPStateTempSessions WHERE SessionID = :SessionID AND Expires > :Expires AND AppPath = :AppPath";
  51                 IDbCommand selectCommand = null;
  52                 string insertCommandText = "INSERT INTO ASPStateTempSessions (SessionId, AppPath, Created, expires, timeout, StaticObjectsData, SessionData)  VALUES (:SessionID, :AppPath, :Created, :Expires, :Timeout, :StaticObjectsData, :SessionData)";
  53                 IDbCommand insertCommand = null;
  54                 string updateCommandText = "UPDATE ASPStateTempSessions SET expires = :Expires, timeout = :Timeout, SessionData = :SessionData WHERE SessionId = :SessionID";
  55                 IDbCommand updateCommand = null;
  56                 string deleteCommandText = "DELETE FROM ASPStateTempSessions WHERE SessionId = :SessionID";
  57                 IDbCommand deleteCommand = null;
  58
  59                 public void Dispose ()
  60                 {
  61                         if (cnc != null) {
  62                                 cnc.Close ();
  63                                 cnc = null;
  64                         }
  65                 }
  66
  67                 public void Init (SessionStateModule module, HttpApplication context,
  68                                   SessionConfig config)
  69                 {
  70                         string connectionTypeName;
  71                         string providerAssemblyName;
  72                         string cncString;
  73
  74                         this.config = config;
  75                         this.AppPath = context.Request.ApplicationPath;
  76
  77                         GetConnectionData (out providerAssemblyName, out connectionTypeName, out cncString);
  78                         if (cncType == null) {
  79                                 Assembly dbAssembly = Assembly.Load (providerAssemblyName);
  80                                 cncType = dbAssembly.GetType (connectionTypeName, true);
  81                                 if (!typeof (IDbConnection).IsAssignableFrom (cncType))
  82                                         throw new ApplicationException ("The type '" + cncType +
  83                                                         "' does not implement IDB Connection.\n" +
  84                                                         "Check 'DbConnectionType' in server.exe.config.");
  85                         }
  86
  87                         cnc = (IDbConnection) Activator.CreateInstance (cncType);
  88                         cnc.ConnectionString = cncString;
  89                         try {
  90                                 InitializeConnection ();
  91                         } catch (Exception exc) {
  92                                 cnc = null;
  93                                 throw exc;
  94                         }
  95
  96                         if (paramPrefix != defaultParamPrefix) {
  97                                 ReplaceParamPrefix (ref selectCommandText);
  98                                 ReplaceParamPrefix (ref insertCommandText);
  99                                 ReplaceParamPrefix (ref updateCommandText);
 100                                 ReplaceParamPrefix (ref deleteCommandText);
 101                         }
 102                 }
 103
 104                 void ReplaceParamPrefix(ref string command)
 105                 {
 106                         command = command.Replace (defaultParamPrefix, paramPrefix);
 107                 }
 108
 109                 public void UpdateHandler (HttpContext context, SessionStateModule module)
 110                 {
 111                         HttpSessionState session = context.Session;
 112                         if (session == null || session.IsReadOnly)
 113                                 return;
 114
 115                         string id = session.SessionID;
 116                         if (!session._abandoned) {
 117                                 SessionDictionary dict = session.SessionDictionary;
 118                                 UpdateSessionWithRetry (id, session.Timeout, dict);
 119                         } else {
 120                                 DeleteSessionWithRetry (id);
 121                         }
 122                 }
 123
 124                 public HttpSessionState UpdateContext (HttpContext context, SessionStateModule module,
 125                                                         bool required, bool read_only, ref bool isNew)
 126                 {
 127                         if (!required)
 128                                 return null;
 129
 130                         HttpSessionState session = null;
 131                         string id = SessionId.Lookup (context.Request, config.CookieLess);
 132
 133                         if (id != null) {
 134                                 session = SelectSession (id, read_only);
 135                                 if (session != null)
 136                                         return session;
 137                         }
 138
 139                         id = SessionId.Create ();
 140                         session = new HttpSessionState (id, new SessionDictionary (),
 141                                         HttpApplicationFactory.ApplicationState.SessionObjects,
 142                                         config.Timeout,
 143                                         true, config.CookieLess, SessionStateMode.SQLServer, read_only);
 144
 145                         InsertSessionWithRetry (session, config.Timeout);
 146                         isNew = true;
 147                         return session;
 148                 }
 149
 150                 private void GetConnectionData (out string providerAssembly,
 151                                 out string cncTypeName, out string cncString)
 152                 {
 153                         providerAssembly = null;
 154                         cncTypeName = null;
 155                         cncString = null;
 156
 157                         NameValueCollection config = ConfigurationSettings.AppSettings;
 158                         if (config != null) {
 159                                 providerAssembly = config ["StateDBProviderAssembly"];
 160                                 cncTypeName = config ["StateDBConnectionType"];
 161                                 paramPrefix = config ["StateDBParamPrefix"];
 162                         }
 163
 164                         cncString = this.config.SqlConnectionString;
 165
 166                         if (providerAssembly == null || providerAssembly == String.Empty)
 167                                 providerAssembly = "Npgsql.dll";
 168
 169                         if (cncTypeName == null || cncTypeName == String.Empty)
 170                                 cncTypeName = "Npgsql.NpgsqlConnection";
 171
 172                         if (cncString == null || cncString == String.Empty)
 173                                 cncString = "SERVER=127.0.0.1;USER ID=monostate;PASSWORD=monostate;dbname=monostate";
 174
 175                         if (paramPrefix == null || paramPrefix == String.Empty)
 176                                 paramPrefix = defaultParamPrefix;
 177                 }
 178
 179                 IDataReader GetReader (string id)
 180                 {
 181                         ((IDataParameter)selectCommand.Parameters["SessionID"]).Value = id;
 182                         ((IDataParameter)selectCommand.Parameters["Expires"]).Value = DateTime.Now;
 183                         ((IDataParameter)selectCommand.Parameters["AppPath"]).Value = this.AppPath;
 184                         return selectCommand.ExecuteReader ();
 185                 }
 186
 187                 IDataReader GetReaderWithRetry (string id)
 188                 {
 189                         try {
 190                                 return GetReader (id);
 191                         } catch {
 192                         }
 193
 194                         try {
 195                                 DisposeConnection();
 196                         } catch {
 197                         }
 198
 199                         InitializeConnection();
 200                         return GetReader (id);
 201                 }
 202
 203                 private HttpSessionState SelectSession (string id, bool read_only)
 204                 {
 205                         HttpSessionState session = null;
 206                         using (IDataReader reader = GetReaderWithRetry (id)) {
 207                                 if (!reader.Read ())
 208                                         return null;
 209
 210                                 SessionDictionary dict;
 211                                 HttpStaticObjectsCollection sobjs;
 212                                 int timeout;
 213
 214                                 dict = SessionDictionary.FromByteArray (ReadBytes (reader, reader.FieldCount-1));
 215                                 sobjs = HttpStaticObjectsCollection.FromByteArray (ReadBytes (reader, reader.FieldCount-2));
 216                                 // try to support as many DBs/int types as possible
 217                                 timeout = Convert.ToInt32 (reader.GetValue (reader.FieldCount-3));
 218
 219                                 session = new HttpSessionState (id, dict, sobjs, timeout, false, config.CookieLess,
 220                                                 SessionStateMode.SQLServer, read_only);
 221                                 return session;
 222                         }
 223                 }
 224
 225                 void InsertSession (HttpSessionState session, int timeout)
 226                 {
 227                         ((IDataParameter)insertCommand.Parameters["SessionID"]).Value = session.SessionID;
 228                         ((IDataParameter)insertCommand.Parameters["AppPath"]).Value = this.AppPath;
 229                         ((IDataParameter)insertCommand.Parameters["Created"]).Value = DateTime.Now;
 230                         ((IDataParameter)insertCommand.Parameters["Expires"]).Value = DateTime.Now.AddMinutes (timeout);
 231                         ((IDataParameter)insertCommand.Parameters["Timeout"]).Value = timeout;
 232                         ((IDataParameter)insertCommand.Parameters["StaticObjectsData"]).Value = session.StaticObjects.ToByteArray ();
 233                         ((IDataParameter)insertCommand.Parameters["SessionData"]).Value = session.SessionDictionary.ToByteArray ();
 234                         insertCommand.ExecuteNonQuery ();
 235                 }
 236
 237                 void InsertSessionWithRetry (HttpSessionState session, int timeout)
 238                 {
 239                         try {
 240                                 InsertSession (session, timeout);
 241                                 return;
 242                         } catch {
 243                         }
 244
 245                         try {
 246                                 DisposeConnection ();
 247                         } catch {
 248                         }
 249
 250                         InitializeConnection ();
 251                         InsertSession (session, timeout);
 252                 }
 253
 254                 void UpdateSession (string id, int timeout, SessionDictionary dict)
 255                 {
 256                         ((IDataParameter)updateCommand.Parameters["SessionID"]).Value = id;
 257                         ((IDataParameter)updateCommand.Parameters["Expires"]).Value = DateTime.Now.AddMinutes (timeout);
 258                         ((IDataParameter)updateCommand.Parameters["Timeout"]).Value = timeout;
 259                         ((IDataParameter)updateCommand.Parameters["SessionData"]).Value = dict.ToByteArray ();
 260
 261                         updateCommand.ExecuteNonQuery ();
 262                 }
 263
 264                 void UpdateSessionWithRetry (string id, int timeout, SessionDictionary dict)
 265                 {
 266                         try {
 267                                 UpdateSession (id, timeout, dict);
 268                                 return;
 269                         } catch {
 270                         }
 271
 272                         try {
 273                                 DisposeConnection ();
 274                         } catch {
 275                         }
 276
 277                         InitializeConnection ();
 278                         UpdateSession (id, timeout, dict);
 279                 }
 280
 281                 void DeleteSession (string id)
 282                 {
 283
 284                         ((IDataParameter)deleteCommand.Parameters["SessionID"]).Value = id;
 285                         deleteCommand.ExecuteNonQuery ();
 286                 }
 287
 288                 void DeleteSessionWithRetry (string id)
 289                 {
 290                         try {
 291                                 DeleteSession (id);
 292                                 return;
 293                         } catch {
 294                         }
 295
 296                         try {
 297                                 DisposeConnection ();
 298                         } catch {
 299                         }
 300
 301                         InitializeConnection ();
 302                         DeleteSession (id);
 303                 }
 304
 305                 void InitializeConnection()
 306                 {
 307                         cnc.Open ();
 308                         selectCommand = cnc.CreateCommand ();
 309                         selectCommand.CommandText = selectCommandText;
 310                         selectCommand.Parameters.Add (CreateParam (selectCommand, DbType.String, "SessionID", String.Empty));
 311                         selectCommand.Parameters.Add (CreateParam (selectCommand, DbType.DateTime, "Expires", DateTime.MinValue ));
 312                         selectCommand.Parameters.Add (CreateParam (selectCommand, DbType.String, "AppPath", String.Empty));
 313                         selectCommand.Prepare ();
 314
 315                         insertCommand = cnc.CreateCommand ();
 316                         insertCommand.CommandText = insertCommandText;
 317                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.String, "SessionID", String.Empty));
 318                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.String, "AppPath", String.Empty));
 319                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.DateTime, "Created", DateTime.MinValue));
 320                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.DateTime, "Expires", DateTime.MinValue));
 321                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.Int32, "Timeout", 0));
 322                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.Binary, "StaticObjectsData",new byte[0] ));
 323                         insertCommand.Parameters.Add (CreateParam (insertCommand, DbType.Binary, "SessionData",
 324                                                    new byte[0]));
 325                         insertCommand.Prepare();
 326
 327                         updateCommand = cnc.CreateCommand ();
 328                         updateCommand.CommandText = updateCommandText;
 329                         updateCommand.Parameters.Add (CreateParam (updateCommand, DbType.String, "SessionID", String.Empty));
 330                         updateCommand.Parameters.Add (CreateParam (updateCommand, DbType.DateTime, "Expires", DateTime.MinValue));
 331                         updateCommand.Parameters.Add (CreateParam (updateCommand, DbType.Int32, "Timeout", 0));
 332                         updateCommand.Parameters.Add (CreateParam (updateCommand, DbType.Binary, "SessionData",
 333                                                                 new byte[0]));
 334                         updateCommand.Prepare();
 335
 336                         deleteCommand = cnc.CreateCommand ();
 337                         deleteCommand.CommandText = deleteCommandText;
 338                         deleteCommand.Parameters.Add (CreateParam (deleteCommand, DbType.String, "SessionID", String.Empty));
 339                         deleteCommand.Prepare();
 340                 }
 341
 342                 void DisposeConnection()
 343                 {
 344                         selectCommand.Dispose();
 345                         insertCommand.Dispose();
 346                         updateCommand.Dispose();
 347                         deleteCommand.Dispose();
 348                         cnc.Close();
 349                 }
 350
 351                 private IDataParameter CreateParam (IDbCommand command, DbType type,
 352                                 string name, object value)
 353                 {
 354                         IDataParameter result = command.CreateParameter ();
 355                         result.DbType = type;
 356                         result.ParameterName = paramPrefix + name;
 357                         result.Value = value;
 358                         return result;
 359                 }
 360
 361                 private byte [] ReadBytes (IDataReader reader, int index)
 362                 {
 363                         int len = (int) reader.GetBytes (index, 0, null, 0, 0);
 364                         byte [] data = new byte [len];
 365                         reader.GetBytes (index, 0, data, 0, len);
 366                         return data;
 367                 }
 368         }
 369 }
 370 #endif