src/storage/SessionImpl.cxx

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by www.databasecache.com                           *
   3  *   Contact: praba_tuty@databasecache.com                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15   ***************************************************************************/
  16 #include<DatabaseManagerImpl.h>
  17 #include<DatabaseManager.h>
  18 #include<CatalogTables.h>
  19 #include<Database.h>
  20 #include<SessionImpl.h>
  21 #include<UserManager.h>
  22 #include<UserManagerImpl.h>
  23 #include<Transaction.h>
  24 #include<Debug.h>
  25 #include<Config.h>
  26 #include<Process.h>
  27
  28 //Before calling this method, application is required to call readConfigValues
  29 DbRetVal SessionImpl::initSystemDatabase()
  30
  31 {
  32     long value=0;
  33
  34     DbRetVal rv = OK;
  35     rv = readConfigFile();
  36     if (rv != OK)
  37     {
  38        printError(ErrSysInit, "Configuration file read failed\n");
  39        return ErrSysInit;
  40     }
  41
  42    // Conf::config.print();
  43
  44     dbMgr = new DatabaseManagerImpl();
  45     rv = dbMgr->createDatabase(SYSTEMDB, Conf::config.getMaxSysDbSize());
  46     if (OK != rv) return rv;
  47
  48     dbMgr->setSysDb(dbMgr->db());
  49     dbMgr->setDb(NULL);
  50
  51     Database *db = dbMgr->sysDb();
  52
  53     rv = db->getDatabaseMutex();
  54     if (OK != rv)
  55     {
  56         printError(ErrLockTimeOut, "Unable to get Database Mutex");
  57         return rv;
  58     }
  59
  60
  61     db->createAllCatalogTables();
  62
  63     //create the default dba user
  64     CatalogTableUSER cUser(db);
  65     rv = cUser.insert(I_USER, I_PASS);
  66     if (OK != rv)
  67     {
  68         db->releaseDatabaseMutex();
  69         return rv;
  70     }
  71
  72     rv = cUser.insert(DBAUSER, DBAPASS);
  73     if (OK != rv)
  74     {
  75         db->releaseDatabaseMutex();
  76         return rv;
  77     }
  78     void *ret = NULL;
  79     //Allocate space for the lock hash bucket
  80     ret = db->allocLockHashBuckets();
  81     if (NULL == ret)
  82     {
  83         db->releaseDatabaseMutex();
  84         printError(ErrSysInit, "Allocation of Lock buckets failed");
  85         return ErrSysInit;
  86     }
  87     db->releaseDatabaseMutex();
  88
  89     printf("Sys_DB  [Size=%4.4ldMB] \nUser_DB [Size=%4.4ldMB]\n", Conf::config.getMaxSysDbSize()/1048576, Conf::config.getMaxDbSize()/1048576);
  90     //create user database
  91     rv = dbMgr->createDatabase("userdb", Conf::config.getMaxDbSize());
  92     if (OK != rv) return rv;
  93     return OK;
  94 }
  95
  96 DbRetVal SessionImpl::destroySystemDatabase()
  97 {
  98     DbRetVal rv = OK;
  99     rv = dbMgr->deleteDatabase(SYSTEMDB);
 100     if (OK != rv) return rv;
 101     rv = dbMgr->deleteDatabase("userdb");
 102     if (OK != rv) return rv;
 103     delete dbMgr;
 104     dbMgr = NULL;
 105     return OK;
 106 }
 107
 108 DbRetVal SessionImpl::open(const char *username, const char *password)
 109 {
 110     DbRetVal rv = OK;
 111     rv = readConfigFile();
 112     if (rv != OK)
 113     {
 114        printError(ErrSysFatal, "Configuration file read failed\n");
 115        return ErrSysFatal;
 116     }
 117
 118     if ( NULL == dbMgr)
 119     {
 120         dbMgr = new DatabaseManagerImpl();
 121         rv = dbMgr->openSystemDatabase();
 122     }
 123     if (OK != rv)
 124     {
 125         printError(rv,"Unable to open the system database");
 126         return rv;
 127     }
 128
 129     rv = authenticate(username, password);
 130     if (OK != rv)
 131     {
 132         dbMgr->closeSystemDatabase();
 133         delete dbMgr; dbMgr = NULL;
 134         return rv;
 135     }
 136
 137     dbMgr->createTransactionManager();
 138     dbMgr->createLockManager();
 139     rv = dbMgr->registerThread();
 140     if (OK != rv)
 141     {
 142         printError(rv,"Unable to register to csql server");
 143         dbMgr->closeSystemDatabase();
 144         delete dbMgr; dbMgr = NULL;
 145         return rv;
 146     }
 147     rv = dbMgr->openDatabase("userdb");
 148     if (OK != rv) {
 149         dbMgr->closeSystemDatabase();
 150         delete dbMgr; dbMgr = NULL;
 151         return rv;
 152     }
 153     ((DatabaseManagerImpl*)dbMgr)->setProcSlot();
 154     //ProcessManager::systemDatabase = dbMgr->sysDb();
 155     isXTaken = false;
 156     return OK;
 157 }
 158 DbRetVal SessionImpl::authenticate(const char *username, const char *password)
 159 {
 160     DbRetVal rv = dbMgr->sysDb()->getDatabaseMutex(false);
 161     if (OK != rv)
 162     {
 163         printError(ErrLockTimeOut,"System under recovery or DDL operation going on.");
 164         printError(ErrLockTimeOut,"Unable to get the database mutex.Retry...");
 165         return ErrLockTimeOut;
 166     }
 167     CatalogTableUSER cUser(dbMgr->sysDb());
 168     cUser.authenticate(username, password, isAuthenticated, isDba);
 169     strcpy(userName, username);
 170     dbMgr->sysDb()->releaseDatabaseMutex(false);
 171     if (!isAuthenticated)
 172     {
 173         printError(ErrNoPrivilege,"User Authentication failed");
 174         return ErrNoPrivilege;
 175     }
 176     return OK;
 177 }
 178 DbRetVal SessionImpl::getExclusiveLock()
 179 {
 180    if (dbMgr->isAnyOneRegistered()) {
 181       printError(ErrLockTimeOut, "Unable to acquire exclusive lock. somebody is connected");
 182       return ErrLockTimeOut;
 183    }
 184    DbRetVal rv = dbMgr->sysDb()->getProcessTableMutex(true);
 185    if (OK == rv) isXTaken = true;
 186    return rv;
 187 }
 188 DbRetVal SessionImpl::close()
 189 {
 190     DbRetVal rv = OK;
 191     if (isXTaken && dbMgr ) dbMgr->sysDb()->releaseProcessTableMutex(true);
 192     if (dbMgr)
 193     {
 194         rv = dbMgr->closeDatabase();
 195         if (rv != OK) { return ErrBadCall;  }
 196         rv = dbMgr->deregisterThread();
 197         if (rv != OK) {  return ErrBadCall;  }
 198         rv = dbMgr->closeSystemDatabase();
 199         if (rv != OK) { return ErrBadCall;  }
 200         delete dbMgr;
 201         dbMgr = NULL;
 202     }
 203     if (uMgr)
 204     {
 205         delete uMgr;
 206         uMgr = NULL;
 207     }
 208     return OK;
 209 }
 210
 211 DatabaseManager* SessionImpl::getDatabaseManager()
 212 {
 213     if (isAuthenticated) return dbMgr;
 214     printError(ErrNoPrivilege, "Not Authenticated: Returning NULL");
 215     return NULL;
 216 }
 217
 218 UserManager* SessionImpl::getUserManager()
 219 {
 220     if (!isAuthenticated)
 221     {
 222         printError(ErrNoPrivilege, "Not Authenticated: Returning NULL");
 223         return NULL;
 224     }
 225     if (uMgr != NULL) return uMgr;
 226     UserManagerImpl *userMgr =  new UserManagerImpl();
 227     if(0 == strcmp(userName, DBAUSER))
 228         userMgr->setDba(true);
 229     else
 230         userMgr->setDba(false);
 231
 232     userMgr->setSysDb(dbMgr->sysDb());
 233
 234     userMgr->setUserName(userName);
 235     uMgr = userMgr;
 236     return userMgr;
 237 }
 238
 239 DbRetVal SessionImpl::startTransaction(IsolationLevel level)
 240 {
 241     if (NULL == dbMgr || NULL == dbMgr->txnMgr())
 242     {
 243         printError(ErrSysFatal, "Database Manager or Txn Manager object is NULL");
 244         return ErrSysFatal;
 245     }
 246     DbRetVal rv = OK;
 247
 248     rv = dbMgr->txnMgr()->startTransaction(dbMgr->lockMgr(), level);
 249     return rv;
 250 }
 251
 252
 253 DbRetVal SessionImpl::commit()
 254 {
 255     DbRetVal rv = OK;
 256     if (NULL == dbMgr || NULL == dbMgr->txnMgr())
 257     {
 258         printError(ErrSysFatal, "Database Manager or Txn Manager object is NULL");
 259         return ErrSysFatal;
 260     }
 261     rv = dbMgr->txnMgr()->commit(dbMgr->lockMgr());
 262     if (OK != rv)
 263     {
 264         printError(rv,"Transaction commit failed\n");
 265         return rv;
 266     }
 267     return OK;
 268 }
 269
 270
 271 DbRetVal SessionImpl::rollback()
 272 {
 273     DbRetVal rv = OK;
 274     if (NULL == dbMgr || NULL == dbMgr->txnMgr())
 275     {
 276         printError(ErrSysFatal, "Database Manager or Txn Manager object is NULL");
 277         return ErrSysFatal;
 278     }
 279     rv = dbMgr->txnMgr()->rollback(dbMgr->lockMgr());
 280     if (OK != rv)
 281     {
 282         printError(rv, "Transaction rollback failed\n");
 283         return rv;
 284     }
 285     return OK;
 286 }
 287
 288 DbRetVal SessionImpl::readConfigFile()
 289 {
 290     // Check if env variable is set or not
 291     char *confFilename = os::getenv("CSQL_CONFIG_FILE");
 292     if (confFilename == NULL)
 293     {
 294         if (os::fileExists(DEFAULT_CONFIG_FILE)) {
 295            confFilename = DEFAULT_CONFIG_FILE;
 296         }
 297         else  {
 298            printError(ErrSysInit, "CSQL_CONFIG_FILE environment variable "
 299                                   "should be set.");
 300            return ErrSysInit;
 301         }
 302     }
 303
 304     int  rv = Conf::config.readAllValues(confFilename);
 305     if (rv != 0) return ErrSysInit;
 306     return OK;
 307 }
 308 Database* SessionImpl::getSystemDatabase()
 309 {
 310     return dbMgr->sysDb();
 311 }
 312