<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/

namespace Magento\Framework\Session;

use Magento\Framework\Session\Config\ConfigInterface;
use Magento\Framework\Exception\SessionException;

/**
* Magento session save handler.
*/
class SaveHandler implements SaveHandlerInterface
{
/**
* Session handler
*
* @var \SessionHandler
*/
protected $saveHandlerAdapter;

/**
* @var SaveHandlerFactory
*/
private $saveHandlerFactory;

/**
* @var ConfigInterface
*/
private $sessionConfig;

/**
* @var string
*/
private $defaultHandler;

/**
* @param SaveHandlerFactory $saveHandlerFactory
* @param ConfigInterface $sessionConfig
* @param string $default
*/
public function __construct(
SaveHandlerFactory $saveHandlerFactory,
ConfigInterface $sessionConfig,
$default = self::DEFAULT_HANDLER
) {
$this->saveHandlerFactory = $saveHandlerFactory;
$this->sessionConfig = $sessionConfig;
$this->defaultHandler = $default;
}

/**
* Open Session - retrieve resources.
*
* @param string $savePath
* @param string $name
* @return bool
*/
public function open($savePath, $name)
{
return $this->callSafely('open', $savePath, $name);
}

/**
* Close Session - free resources.
*
* @return bool
*/
public function close()
{
return $this->callSafely('close');
}

/**
* Read session data.
*
* @param string $sessionId
* @return string
*/
public function read($sessionId)
{
return $this->callSafely('read', $sessionId);
}

/**
* Write Session - commit data to resource.
*
* @param string $sessionId
* @param string $data
* @return bool
*/
public function write($sessionId, $data)
{
return $this->callSafely('write', $sessionId, $data);
}

/**
* Destroy Session - remove data from resource for given session id.
*
* @param string $sessionId
* @return bool
*/
public function destroy($sessionId)
{
return $this->callSafely('destroy', $sessionId);
}

/**
* Garbage Collection - remove old session data older than $maxLifetime (in seconds).
*
* @param int $maxLifetime
* @return bool
* @SuppressWarnings(PHPMD.ShortMethodName)
*/
public function gc($maxLifetime)
{
return $this->callSafely('gc', $maxLifetime);
}

/**
* Call save handler adapter method.
*
* In case custom handler failed, default files handler is used.
*
* @param string $method
* @param mixed $arguments
*
* @return mixed
*/
private function callSafely(string $method, ...$arguments)
{
try {
if ($this->saveHandlerAdapter === null) {
$saveMethod = $this->sessionConfig->getOption('session.save_handler') ?: $this->defaultHandler;
$this->saveHandlerAdapter = $this->saveHandlerFactory->create($saveMethod);
}
return $this->saveHandlerAdapter->{$method}(...$arguments);
} catch (SessionException $exception) {
$this->saveHandlerAdapter = $this->saveHandlerFactory->create($this->defaultHandler);
return $this->saveHandlerAdapter->{$method}(...$arguments);
}
}
}