class.ilECSTaskScheduler.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 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. |
        +-----------------------------------------------------------------------------+
*/

class ilECSTaskScheduler
{
        const MAX_TASKS = 30;
        
        private static $instances = array();
        
        private $event_reader = null;

        protected $settings = null;
        protected $log = null;
        protected $db;
        
        private $mids = array();
        
        private function __construct(ilECSSetting $setting)
        {
                global $ilDB,$ilLog;
                
                $this->db = $ilDB;
                $this->log = $ilLog;
                
                include_once('./Services/WebServices/ECS/classes/class.ilECSSetting.php');
                $this->settings = $setting;
        }

        public static function _getInstanceByServerId($a_server_id)
        {
                if(self::$instances[$a_server_id])
                {
                        return self::$instances[$a_server_id];
                }
                include_once './Services/WebServices/ECS/classes/class.ilECSSetting.php';
                return self::$instances[$a_server_id] =
                        new ilECSTaskScheduler(
                                ilECSSetting::getInstanceByServerId($a_server_id)
                );
        }

        public static function start()
        {
                include_once './Services/Context/classes/class.ilContext.php';
                if(ilContext::getType() != ilContext::CONTEXT_WEB)
                {
                        return;
                }
                
                include_once './Services/WebServices/ECS/classes/class.ilECSServerSettings.php';
                $servers = ilECSServerSettings::getInstance();
                foreach($servers->getServers() as $server)
                {
                        $sched = new ilECSTaskScheduler($server);
                        if($sched->checkNextExecution())
                        {
                                $sched->initNextExecution();
                        }
                }
        }

        public static function startExecution()
        {
                include_once './Services/WebServices/ECS/classes/class.ilECSServerSettings.php';
                $server = ilECSServerSettings::getInstance();
                foreach($server->getServers() as $server)
                {
                        $sched = new ilECSTaskScheduler($server);
                        $sched->startTaskExecution();
                }
        }

        public function getServer()
        {
                return $this->settings;
        }


        public function startTaskExecution()
        {
                global $ilLog;

                try
                {
                        $this->readMIDs();
                        $this->readEvents();
                        $this->handleEvents();
                        
                        $this->handleDeprecatedAccounts();
                }
                catch(ilException $exc)
                {
                        $this->log->write(__METHOD__.': Caught exception: '.$exc->getMessage());
                        return false;
                }
                return true;
        }
        
        private function readEvents()
        {
                try
                {
                        include_once('./Services/WebServices/ECS/classes/class.ilECSEventQueueReader.php');
                        $this->event_reader = new ilECSEventQueueReader($this->getServer()->getServerId());
                        $this->event_reader->refresh();
                }
                catch(ilException $exc)
                {
                        throw $exc;
                }
        }
        
        private function handleEvents()
        {
                include_once './Services/WebServices/ECS/classes/class.ilECSEvent.php';

                for($i = 0;$i < self::MAX_TASKS;$i++)
                {               
                        if(!$event = $this->event_reader->shift())
                        {
                                $this->log->write(__METHOD__.': No more pending events found. DONE');
                                break;
                        }
                        
                        $this->log->write(print_r($event, true));
                        
                        // determine event handler
                        
                        $event_ignored = false;
                        switch($event['type'])
                        {
                                case ilECSEventQueueReader::TYPE_REMOTE_COURSE:
                                case ilECSEventQueueReader::TYPE_REMOTE_CATEGORY:
                                case ilECSEventQueueReader::TYPE_REMOTE_FILE:
                                case ilECSEventQueueReader::TYPE_REMOTE_GLOSSARY:
                                case ilECSEventQueueReader::TYPE_REMOTE_GROUP:
                                case ilECSEventQueueReader::TYPE_REMOTE_LEARNING_MODULE:
                                case ilECSEventQueueReader::TYPE_REMOTE_WIKI:
                                case ilECSEventQueueReader::TYPE_REMOTE_TEST:
                                        include_once 'Services/WebServices/ECS/classes/class.ilRemoteObjectBase.php';
                                        $handler = ilRemoteObjectBase::getInstanceByEventType($event['type']);
                                        $this->log->write("got handler ".get_class($handler));
                                        break;
                                
                                case ilECSEventQueueReader::TYPE_DIRECTORY_TREES:
                                        include_once './Services/WebServices/ECS/classes/Tree/class.ilECSCmsTreeCommandQueueHandler.php';
                                        $handler = new ilECSCmsTreeCommandQueueHandler($this->getServer());
                                        break;
                                
                                case ilECSEventQueueReader::TYPE_CMS_COURSES:
                                        include_once './Services/WebServices/ECS/classes/Course/class.ilECSCmsCourseCommandQueueHandler.php';
                                        $handler = new ilECSCmsCourseCommandQueueHandler($this->getServer());
                                        break;
                                
                                case ilECSEventQueueReader::TYPE_CMS_COURSE_MEMBERS:
                                        include_once './Services/WebServices/ECS/classes/Course/class.ilECSCmsCourseMemberCommandQueueHandler.php';
                                        $handler = new ilECSCmsCourseMemberCommandQueueHandler($this->getServer());
                                        break;
                                
                                case ilECSEventQueueReader::TYPE_COURSE_URLS:
                                        $this->log->write(__METHOD__.': Ignoring event type in queue '.$event['type']);
                                        $event_ignored = true;
                                        break;
                                
                                case ilECSEventQueueReader::TYPE_ENROLMENT_STATUS:
                                        include_once './Services/WebServices/ECS/classes/Connectors/class.ilECSEnrolmentStatusCommandQueueHandler.php';
                                        $handler = new ilECSEnrolmentStatusCommandQueueHandler($this->getServer());
                                        break;

                                default:
                                        $this->log->write(__METHOD__.': Unknown event type in queue '.$event['type']);
                                        $event_ignored = true;
                                        break;
                        }
                        
                        if($event_ignored)
                        {
                                $this->event_reader->delete($event['event_id']);
                                continue;
                        }
                        
                        $res = false;
                        switch($event['op'])
                        {                                                                               
                                case ilECSEvent::NEW_EXPORT:
                                        // DEPRECATED?
                                        // $this->handleNewlyCreate($event['id']);
                                        // $this->log->write(__METHOD__.': Handling new creation. DONE');
                                        break;
                        
                                case ilECSEvent::DESTROYED;
                                        $res = $handler->handleDelete($this->getServer(), $event['id'],$this->mids);
                                        $this->log->write(__METHOD__.': Handling delete. DONE');
                                        break;
                                                
                                case ilECSEvent::CREATED:
                                        $res = $handler->handleCreate($this->getServer(), $event['id'], $this->mids);
                                        $this->log->write(__METHOD__.': Handling create. DONE');
                                        break;
                                
                                case ilECSEvent::UPDATED:
                                        $res = $handler->handleUpdate($this->getServer(), $event['id'], $this->mids);
                                        $this->log->write(__METHOD__.': Handling update. DONE');
                                        break;
                                
                                default:
                                        $this->log->write(__METHOD__.': Unknown event operation in queue '.$event['op']);
                                        break;
                        }
                        if($res)
                        {
                                $this->log->write(__METHOD__.': Processing of event done '.$event['event_id']);
                                $this->event_reader->delete($event['event_id']);
                        }       
                        else
                        {
                                $this->log->write(__METHOD__.': Processing of event failed '.$event['event_id']);
                        }
                }
        }
        
        private function handleDeprecatedAccounts()
        {
                global $ilDB;
                
                $query = "SELECT usr_id FROM usr_data WHERE auth_mode = 'ecs' ".
                        "AND time_limit_until < ".time()." ".
                        "AND time_limit_unlimited = 0 ".
                        "AND (time_limit_until - time_limit_from) < 7200";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        if($user_obj = ilObjectFactory::getInstanceByObjId($row->usr_id,false))
                        {
                                $this->log->write(__METHOD__.': Deleting deprecated ECS user account '.$user_obj->getLogin());
                                $user_obj->delete();
                        }
                        // only one user
                        break;
                }
                return true;
        }
        
        private function readMIDs()
        {
                try
                {
                        $this->mids = array();
                        
                        include_once('./Services/WebServices/ECS/classes/class.ilECSCommunityReader.php');
                        $reader = ilECSCommunityReader::getInstanceByServerId($this->getServer()->getServerId());
                        foreach($reader->getCommunities() as $com)
                        {
                                foreach($com->getParticipants() as $part)
                                {
                                        if($part->isSelf())
                                        {
                                                $this->mids[] = $part->getMID();
                                                #$this->log->write('Fetch MID: '.$part->getMID());
                                        }
                                }
                        }
                }
                catch(ilException $exc)
                {
                        throw $exc;
                }
        }
        
        
        public function checkNextExecution()
        {
                global $ilLog, $ilDB;

                
                if(!$this->settings->isEnabled())
                {
                        return false;
                }
                
                if(!$this->settings->checkImportId())
                {
                        $this->log->write(__METHOD__.': Import ID is deleted or not of type "category". Aborting');
                        return false;
                }

                // check next task excecution time:
                // If it's greater than time() directly increase this value with the polling time
                /* synchronized { */
                $query = 'UPDATE settings SET '.
                        'value = '.$ilDB->quote(time() + $this->settings->getPollingTime(),'text').' '.
                        'WHERE module = '.$ilDB->quote('ecs','text').' '.
                        'AND keyword = '.$ilDB->quote('next_execution_'.$this->settings->getServerId(),'text').' '.
                        'AND value < '.$ilDB->quote(time(),'text');
                $affected_rows = $ilDB->manipulate($query);
                /* } */


                if(!$affected_rows)
                {
                        // Nothing to do
                        return false;
                }
                return true;
        }


        protected function initNextExecution()
        {
                global $ilLog;

                // Start task execution as backend process
                include_once 'Services/WebServices/SOAP/classes/class.ilSoapClient.php';

                $soap_client = new ilSoapClient();
                $soap_client->setResponseTimeout(1);
                $soap_client->enableWSDL(true);

                #$ilLog->write(__METHOD__.': Trying to call Soap client...');
                $new_session_id = ilSession::_duplicate($_COOKIE['PHPSESSID']);
                $client_id = $_COOKIE['ilClientId'];

                if($soap_client->init() and 0)
                {
                        $ilLog->write(__METHOD__.': Calling soap handleECSTasks method...');
                        $res = $soap_client->call('handleECSTasks',array($new_session_id.'::'.$client_id,$this->settings->getServerId()));
                }
                else
                {
                        $ilLog->write(__METHOD__.': SOAP call failed. Calling clone method manually. ');
                        include_once('./webservice/soap/include/inc.soap_functions.php');
                        $res = ilSoapFunctions::handleECSTasks($new_session_id.'::'.$client_id,$this->settings->getServerId());
                }
        }
}
?>