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<?php
namespace Core;
use DirectoryIterator;
use PDOException;
/**
* Plugin Loader
*
* @package core
* @author Frederic Guillot
*/
class PluginLoader extends Base
{
/**
* Schema version table for plugins
*
* @var string
*/
const TABLE_SCHEMA = 'plugin_schema_versions';
/**
* Plugin folder
*
* @var string
*/
const PATH = __DIR__.'/../../plugins';
/**
* Scan plugin folder and load plugins
*
* @access public
*/
public function scan()
{
if (file_exists(self::PATH)) {
$dir = new DirectoryIterator(self::PATH);
foreach ($dir as $fileinfo) {
if (! $fileinfo->isDot() && $fileinfo->isDir()) {
$plugin = $fileinfo->getFilename();
$this->loadSchema($plugin);
$this->load($plugin);
}
}
}
}
/**
* Load plugin
*
* @access public
*/
public function load($plugin)
{
$class = '\Plugin\\'.$plugin.'\\Plugin';
$instance = new $class($this->container);
Tool::buildDic($this->container, $instance->getClasses());
$instance->initialize();
}
/**
* Load plugin schema
*
* @access public
* @param string $plugin
*/
public function loadSchema($plugin)
{
$filename = __DIR__.'/../../plugins/'.$plugin.'/Schema/'.ucfirst(DB_DRIVER).'.php';
if (file_exists($filename)) {
require($filename);
$this->migrateSchema($plugin);
}
}
/**
* Execute plugin schema migrations
*
* @access public
* @param string $plugin
*/
public function migrateSchema($plugin)
{
$last_version = constant('\Plugin\\'.$plugin.'\Schema\VERSION');
$current_version = $this->getSchemaVersion($plugin);
try {
$this->db->startTransaction();
$this->db->getDriver()->disableForeignKeys();
for ($i = $current_version + 1; $i <= $last_version; $i++) {
$function_name = '\Plugin\\'.$plugin.'\Schema\version_'.$i;
if (function_exists($function_name)) {
call_user_func($function_name, $this->db->getConnection());
}
}
$this->db->getDriver()->enableForeignKeys();
$this->db->closeTransaction();
$this->setSchemaVersion($plugin, $i - 1);
}
catch (PDOException $e) {
$this->db->cancelTransaction();
$this->db->getDriver()->enableForeignKeys();
die('Unable to migrate schema for the plugin: '.$plugin.' => '.$e->getMessage());
}
}
/**
* Get current plugin schema version
*
* @access public
* @param string $plugin
* @return integer
*/
public function getSchemaVersion($plugin)
{
return (int) $this->db->table(self::TABLE_SCHEMA)->eq('plugin', strtolower($plugin))->findOneColumn('version');
}
/**
* Save last plugin schema version
*
* @access public
* @param string $plugin
* @param integer $version
* @return boolean
*/
public function setSchemaVersion($plugin, $version)
{
$dictionary = array(
strtolower($plugin) => $version
);
return $this->db->getDriver()->upsert(self::TABLE_SCHEMA, 'plugin', 'version', $dictionary);
}
}
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