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<?php
/**
* @package admintools
* @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 3, or later
*/
namespace Akeeba\AdminTools\Admin\Model;
defined('_JEXEC') || die;
use Exception;
use FOF40\Model\Model;
use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Factory;
use Joomla\Session\SessionInterface;
use JSessionStorage;
use ReflectionObject;
class DatabaseTools extends Model
{
/** @var float The time the process started */
private $startTime = null;
/**
* Finds all tables using the current site's prefix
*
* @return array
*/
public function findTables()
{
static $ret = null;
if (is_null($ret))
{
$db = $this->container->db;
$prefix = $db->getPrefix();
$plen = strlen($prefix);
$allTables = $db->getTableList();
if (empty($prefix))
{
$ret = $allTables;
}
else
{
$ret = [];
foreach ($allTables as $table)
{
if (substr($table, 0, $plen) == $prefix)
{
$ret[] = $table;
}
}
}
}
return $ret;
}
public function repairAndOptimise($fromTable = null, $echo = false)
{
$this->resetTimer();
$tables = $this->findTables();
if (!empty($fromTable))
{
$table = '';
while ($table != $fromTable)
{
$table = array_shift($tables);
}
}
$db = $this->container->db;
while (count($tables) && $this->haveEnoughTime())
{
$table = array_shift($tables);
// On Joomla 4 we cannot run CHECK TABLE. Therefore we have to assume it's not OK.
$isOK = false;
$result = null;
if (version_compare(JVERSION, '3.999.999', 'lt'))
{
// First, check the table
$this->executeUnpreparedQuery('CHECK TABLE ' . $db->qn($table));
$db->setQuery('CHECK TABLE ' . $db->qn($table));
$result = $db->loadObjectList();
}
if (!empty($result))
{
foreach ($result as $row)
{
if (($row->Msg_type == 'status') && (
($row->Msg_text == 'OK') ||
($row->Msg_text == 'Table is already up to date')
)
)
{
$isOK = true;
}
}
}
// Run a repair only if it is required
if (!$isOK)
{
// The table needs repair
if ($echo)
{
echo "Repairing $table\n";
}
$this->executeUnpreparedQuery('REPAIR TABLE ' . $db->qn($table));
}
// Finally, optimize
if ($echo)
{
echo "Optimizing $table\n";
}
$this->executeUnpreparedQuery('OPTIMIZE TABLE ' . $db->qn($table));
}
if (!count($tables))
{
return '';
}
return $table;
}
/**
* Ask Joomla! to garbage collect expired session.
*
* @return void
*
* @since 5.0.0
*/
public function garbageCollectSessions()
{
if (version_compare(JVERSION, '3.999.999', 'lt'))
{
$this->gcSessionJoomla3();
return;
}
$this->gcSessionJoomla4();
}
/**
* Clean and optimize the #__sessions table. The idea is that the sessions table may get corrupt over time due to
* the number of read / write operations and / or ending up with stuck phantom session records.
*
* @return void
*/
public function purgeSessions()
{
$db = $this->container->db;
try
{
$db->truncateTable('#__session');
$db->setQuery('DELETE FROM ' . $db->qn('#__session'));
$db->execute();
$this->executeUnpreparedQuery('OPTIMIZE TABLE ' . $db->qn('#__session'));
}
catch (Exception $e)
{
return;
}
}
/**
* Returns the current timestampt in decimal seconds
*/
private function microtime_float()
{
[$usec, $sec] = explode(" ", microtime());
return ((float) $usec + (float) $sec);
}
/**
* Starts or resets the internal timer
*/
private function resetTimer()
{
$this->startTime = $this->microtime_float();
}
/**
* Makes sure that no more than 3 seconds since the start of the timer have
* elapsed
*
* @return bool
*/
private function haveEnoughTime()
{
$now = $this->microtime_float();
$elapsed = abs($now - $this->startTime);
return $elapsed < 3;
}
/**
* Asks the Joomla! 3 session storage handler to garbage collect any open sessions. This SHOULD remove expired
* sessions, as long as Joomla implements this feature for the given handler.
*
* @return void
*
* @since 5.7.0
*/
private function gcSessionJoomla3()
{
$options = [];
$conf = $this->container->platform->getConfig();
$handler = $conf->get('session_handler', 'none');
// config time is in minutes
$options['expire'] = ($conf->get('lifetime')) ? $conf->get('lifetime') * 60 : 900;
$storage = JSessionStorage::getInstance($handler, $options);
$storage->gc($options['expire']);
}
/**
* Asks the Joomla 4 session object to garbage collect any open sessions. This SHOULD remove expired sessions, as
* long as Joomla implements this feature for the session handler used internally in the object.
*
* @return void
*
* @since 5.7.0
*/
private function gcSessionJoomla4()
{
try
{
$app = Factory::getApplication();
if (!($app instanceof CMSApplication))
{
return;
}
$session = $app->getSession();
if (!($session instanceof SessionInterface))
{
return;
}
$session->gc();
}
catch (Exception $e)
{
// It's OK if we fail. No harm, no foul.
}
}
/**
* Executes an unprepared SQL statement.
*
* The PDO driver doesn't distinguish between prepared and unprepared statements. Therefore we can just run anything
* we please. The MySQLi driver, however, has a distinction between prepared and unprepared statements. We cannot
* run certain SQL comments (such as OPTIMIZE and REPAIR) over a prepared statement. The MySQLi driver has a handy
* method called executeUnpreparedStatement which is protected and which runs this kind of statements.
*
* This here method tries to figure out if the database driver object has that method and use it instead of the
* prepared statement.
*
* @param $sql
*
* @return bool|mixed
*/
private function executeUnpreparedQuery($sql)
{
/** @var \JDatabaseDriver $db */
$db = $this->container->db;
if (version_compare(JVERSION, '3.999.999', 'le'))
{
return $db->setQuery($sql)->execute();
}
$refObj = new ReflectionObject($db);
try
{
$method = $refObj->getMethod('executeUnpreparedQuery');
$method->setAccessible(true);
return $method->invoke($db, $sql);
}
catch (\ReflectionException $e)
{
return $db->execute();
}
}
}