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
  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
  38 namespace System.Web.SessionState {
  39
  40         internal class SessionSQLServerHandler : ISessionHandler
  41         {
  42                 const int DefTimeout = 600;
  43
  44                 private Type cncType = null;
  45                 private IDbConnection cnc = null;
  46                 private SessionConfig config;
  47
  48                 public void Dispose ()
  49                 {
  50                         if (cnc != null) {
  51                                 cnc.Close ();
  52                                 cnc = null;
  53                         }
  54                 }
  55
  56                 public void Init (SessionStateModule module, HttpApplication context, SessionConfig config)
  57                 {
  58                         string connectionTypeName;
  59                         string providerAssemblyName;
  60                         string cncString;
  61
  62                         this.config = config;
  63
  64                         GetConnectionData (out providerAssemblyName, out connectionTypeName, out cncString);
  65                         if (cncType == null) {
  66                                 Assembly dbAssembly = Assembly.Load (providerAssemblyName);
  67                                 cncType = dbAssembly.GetType (connectionTypeName, true);
  68                                 if (!typeof (IDbConnection).IsAssignableFrom (cncType))
  69                                         throw new ApplicationException ("The type '" + cncType +
  70                                                         "' does not implement IDB Connection.\n" +
  71                                                         "Check 'DbConnectionType' in server.exe.config.");
  72                         }
  73
  74                         cnc = (IDbConnection) Activator.CreateInstance (cncType);
  75                         cnc.ConnectionString = cncString;
  76                         try {
  77                                 cnc.Open ();
  78                         } catch (Exception exc) {
  79                                 cnc = null;
  80                                 throw exc;
  81                         }
  82                 }
  83
  84                 public void UpdateHandler (HttpContext context, SessionStateModule module)
  85                 {
  86                         if (context.Session == null || context.Session.IsReadOnly)
  87                                 return;
  88
  89                         string id = context.Session.SessionID;
  90                         SessionDictionary dict = context.Session.SessionDictionary;
  91
  92                         UpdateSession (id, dict);
  93                 }
  94
  95                 public HttpSessionState UpdateContext (HttpContext context, SessionStateModule module,
  96                                                         bool required, bool read_only, ref bool isNew)
  97                 {
  98                         if (!required)
  99                                 return null;
 100
 101                         HttpSessionState session = null;
 102                         string id = SessionId.Lookup (context.Request, config.CookieLess);
 103
 104                         if (id != null) {
 105                                 session = SelectSession (id, read_only);
 106                                 if (session != null)
 107                                         return session;
 108                         }
 109
 110                         id = SessionId.Create (module.Rng);
 111                         session = new HttpSessionState (id, new SessionDictionary (),
 112                                         HttpApplicationFactory.ApplicationState.SessionObjects, config.Timeout,
 113                                         true, config.CookieLess, SessionStateMode.SQLServer, read_only);
 114
 115                         InsertSession (session, config.Timeout);
 116                         isNew = true;
 117                         return session;
 118                 }
 119
 120                 private void GetConnectionData (out string providerAssembly,
 121                                 out string cncTypeName, out string cncString)
 122                 {
 123                         providerAssembly = null;
 124                         cncTypeName = null;
 125                         cncString = null;
 126
 127                         NameValueCollection config = ConfigurationSettings.AppSettings as NameValueCollection;
 128                         if (config != null) {
 129                                 foreach (string s in config.Keys) {
 130                                         if (0 == String.Compare ("StateDBProviderAssembly", s, true)) {
 131                                                 providerAssembly = config [s];
 132                                         } else if (0 == String.Compare ("StateDBConnectionType", s, true)) {
 133                                                 cncTypeName = config [s];
 134                                         }
 135                                 }
 136                         }
 137
 138                         cncString = this.config.SqlConnectionString;
 139
 140                         if (providerAssembly == null || providerAssembly == String.Empty)
 141                                 providerAssembly = "Npgsql.dll";
 142
 143                         if (cncTypeName == null || cncTypeName == String.Empty)
 144                                 cncTypeName = "Npgsql.NpgsqlConnection";
 145
 146                         if (cncString == null || cncString == String.Empty)
 147                                 cncString = "SERVER=127.0.0.1;USER ID=monostate;PASSWORD=monostate;dbname=monostate";
 148                 }
 149
 150                 private HttpSessionState SelectSession (string id, bool read_only)
 151                 {
 152                         HttpSessionState session = null;
 153                         IDbCommand command = cnc.CreateCommand();
 154                         IDataReader reader;
 155
 156                         string select = "SELECT * from aspstatetempsessions WHERE SessionID = :SessionID";
 157
 158                         command.CommandText = select;
 159
 160                         command.Parameters.Add (CreateParam (command, DbType.String, ":SessionID", id));
 161
 162                         try {
 163                                 reader = command.ExecuteReader ();
 164
 165                                 if (!reader.Read ())
 166                                         return null;
 167
 168                                 SessionDictionary dict;
 169                                 HttpStaticObjectsCollection sobjs;
 170
 171                                 dict = SessionDictionary.FromByteArray (ReadBytes (reader, reader.FieldCount-1));
 172                                 sobjs = HttpStaticObjectsCollection.FromByteArray (ReadBytes (reader, reader.FieldCount-2));
 173
 174                                 session = new HttpSessionState (id, dict, sobjs, 100, false, config.CookieLess,
 175                                                 SessionStateMode.SQLServer, read_only);
 176                                 return session;
 177                         } catch {
 178                                 throw;
 179                         }
 180                 }
 181
 182                 private void InsertSession (HttpSessionState session, int timeout)
 183                 {
 184                         IDbCommand command = cnc.CreateCommand ();
 185                         IDataParameterCollection param;
 186
 187                         string insert = "INSERT INTO ASPStateTempSessions VALUES " +
 188                         "(:SessionID, :Created, :Expires, :Timeout, :StaticObjectsData, :SessionData)";
 189
 190                         command.CommandText = insert;
 191
 192                         param = command.Parameters;
 193                         param.Add (CreateParam (command, DbType.String, ":SessionID", session.SessionID));
 194                         param.Add (CreateParam (command, DbType.DateTime, ":Created", DateTime.Now));
 195                         param.Add (CreateParam (command, DbType.DateTime, ":Expires", Tommorow ()));
 196                         param.Add (CreateParam (command, DbType.Int32, ":Timeout", timeout));
 197                         param.Add (CreateParam (command, DbType.Binary, ":StaticObjectsData",
 198                                                    session.StaticObjects.ToByteArray ()));
 199                         param.Add (CreateParam (command, DbType.Binary, ":SessionData",
 200                                                    session.SessionDictionary.ToByteArray ()));
 201
 202                         command.ExecuteNonQuery ();
 203                 }
 204
 205                 private void UpdateSession (string id, SessionDictionary dict)
 206                 {
 207                         IDbCommand command = cnc.CreateCommand ();
 208                         IDataParameterCollection param;
 209
 210                         string update = "UPDATE ASPStateTempSessions SET " +
 211                         "SessionData = :SessionData WHERE SessionId = :SessionID";
 212
 213                         command.CommandText = update;
 214
 215                         param = command.Parameters;
 216                         param.Add (CreateParam (command, DbType.String, ":SessionID", id));
 217                         param.Add (CreateParam (command, DbType.Binary, ":SessionData",
 218                                                                 dict.ToByteArray ()));
 219
 220                         command.ExecuteNonQuery ();
 221                 }
 222
 223                 private IDataParameter CreateParam (IDbCommand command, DbType type,
 224                                 string name, object value)
 225                 {
 226                         IDataParameter result = command.CreateParameter ();
 227                         result.DbType = type;
 228                         result.ParameterName = name;
 229                         result.Value = value;
 230                         return result;
 231                 }
 232
 233                 private DateTime Tommorow ()
 234                 {
 235                         return DateTime.Now.AddDays (1);
 236                 }
 237
 238                 private byte [] ReadBytes (IDataReader reader, int index)
 239                 {
 240                         int len = (int) reader.GetBytes (reader.FieldCount-1, 0, null, 0, 0);
 241                         byte [] data = new byte [len];
 242                         reader.GetBytes (index, 0, data, 0, len);
 243                         return data;
 244                 }
 245         }
 246 }
 247