class.ilCronClients.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/


// include pear
//require_once("DB.php");

include_once 'PEAR.php';
include_once 'MDB2.php';

class ilCronClients extends PEAR
{
        var $fp;

        // PRIVATE CONTRUCTOR
        function ilCronClients()
        {
                define('INI_FILE_PATH','../ilias.ini.php');
                define('CRON_DEBUG',1);

                $this->__createLock();
                $this->__readClients();
                register_shutdown_function(array($this,'__ilCronClients'));
        }


        function &_getInstance()
        {
                if(ilCronClients::_lockExists())
                {
                        die('Instance already created');
                }
                return new ilCronClients();
        }

        function __createLock()
        {
                $this->fp = @fopen('cron.lock','wb');
                fwrite($this->fp,(string) time(),strlen((string) time()));

                return true;
        }

        function _lockExists()
        {
                if(@file_exists('cron.lock'))
                {
                        $fp = fopen('cron.lock','r');

                        (int) $timest = fread($fp,filesize('cron.lock'));
                        
                        if(!CRON_DEBUG and ($timest > time() - 60 * 60 * 12))
                        {
                                return true;
                        }
                        unlink('cron.lock');
                }
                return false;
        }

        function __readClients()
        {
                include_once '../classes/class.ilIniFile.php';

                $ini_file_obj =& new ilIniFile(INI_FILE_PATH);

                $ini_file_obj->read();

                $this->log['enabled'] = $ini_file_obj->readVariable('log','enabled');
                $this->log['path'] = $ini_file_obj->readVariable('log','path');
                $this->log['file'] = $ini_file_obj->readVariable('log','file');

                $this->web_enabled = $ini_file_obj->readVariable('cron','web_enabled');
                $this->web_pass = $ini_file_obj->readVariable('cron','web_pass');
                $this->__checkAccess();


                $this->client_data = $ini_file_obj->readGroup('clients');
                unset($ini_file_obj);

                // open client.ini.php

                // set path to directory where clients reside

                $this->client_ini = array();
                $dp = opendir('../'.$this->client_data['path']);
                while(($file = readdir($dp)) !== false)
                {
                        if($file == '.' or $file == '..' or $file == 'CVS')
                        {
                                continue;
                        }
                        if(@file_exists('../'.$this->client_data['path'].'/'.$file.'/'.$this->client_data['inifile']))
                        {
                                $tmp_data['path'] = '../'.$this->client_data['path'].'/'.$file.'/'.$this->client_data['inifile'];
                                $tmp_data['name'] = $file;

                                $this->client_ini[] = $tmp_data;
                                unset($tmp_data);
                        }
                }

                $this->__startChecks();
        }

        function __startChecks()
        {
                foreach($this->client_ini as $client_data)
                {
                        include_once '../classes/class.ilIniFile.php';

                        $ini_file_obj =& new ilIniFile($client_data['path']);

                        $ini_file_obj->read();
                        $this->db_data = $ini_file_obj->readGroup('db');

                        $this->__readFileDBVersion();

                        if($this->__openDb())
                        {
                                include_once './classes/class.ilCron.php';
                                
                                $cron_obj =& new ilCron($this->db);
                                if($this->log['enabled'])
                                {
                                        $cron_obj->initLog($this->log['path'],$this->log['file'],$client_data['name']);
                                }
                                
                                if($this->__checkDBVersion())
                                {
                                        $cron_obj->start();
                                }
                                else
                                {
                                        include_once '../Services/Logging/classes/class.ilLog.php';
                                        
                                        $log =& new ilLog($this->log['path'],$this->log['file']);
                                        $log->write('Cron: Database not up to date. Aborting');
                                }
                                $this->db->disconnect();
                        }
                }
        }

        function __openDb()
        {
                $dsn = $this->db_data['type']."://".
                        $this->db_data['user'].":".
                        $this->db_data['pass']."@".
                        $this->db_data['host']."/".
                        $this->db_data['name'];

                $this->db = MDB2::connect($dsn,true);

                if (MDB2::isError($this->db))
                {
                        return false;
                }
                return true;
        }

        function __checkDBVersion()
        {
                $query = "SELECT value FROM settings ".
                        "WHERE keyword = 'db_version'";

                $res = $this->db->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $db_version = $row->value;
                }

                return $db_version == $this->file_version;
        }

        function __readFileDBVersion()
        {
                $this->db_version = 99999;

                // GET FILE VERSION
                if(!$content = file('../setup/sql/dbupdate_02.php'))
                {
                        echo 'Cannot open ../setup/sql/dbupdate_02.php';
                        return false;
                }
                foreach($content as $row)
                {
                        if(preg_match('/^<#([0-9]+)>/',$row,$matches))
                        {
                                $this->file_version = $matches[1];
                        }
                }
        }

        function __checkAccess()
        {
                if($_SERVER['REQUEST_URI'])
                {
                        if(!$this->web_enabled or ($_GET['web_pass'] !== $this->web_pass))
                        {
                                if($this->log['enabled'])
                                {
                                        include_once '../Services/Logging/classes/class.ilLog.php';

                                        $this->log =& new ilLog($this->log['path'],$this->log['file']);

                                        $this->log->write('Cron: __checkAccess() failed');
                                        
                                        exit;
                                }
                        }
                }
                return true;
        }



        function __ilCronClients()
        {
                fclose($this->fp);
        }
}