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<?php

/**
 * Simple Machines Forum (SMF)
 *
 * @package SMF
 * @author Simple Machines http://www.simplemachines.org
 * @copyright 2019 Simple Machines and individual contributors
 * @license http://www.simplemachines.org/about/smf/license.php BSD
 *
 * @version 2.1 RC1
 */

if (!defined('SMF'))
    die('Hacking attempt...');

/**
 * Our Cache API class
 *
 * @package cacheAPI
 */
class memcache_cache extends cache_api
{
    /**
     * @var \Memcache The memcache instance.
     */
    private $memcache = null;

    /**
     * {@inheritDoc}
     */
    public function isSupported($test = false)
    {
        global $cache_memcached;

        $supported = class_exists('memcache');

        if ($test)
            return $supported;
        return parent::isSupported() && $supported && !empty($cache_memcached);
    }

    /**
     * {@inheritDoc}
     */
    public function connect()
    {
        global $db_persist, $cache_memcached;

        $servers = explode(',', $cache_memcached);
        $port = 0;

        // Don't try more times than we have servers!
        $connected = false;
        $level = 0;

        // We should keep trying if a server times out, but only for the amount of servers we have.
        while (!$connected && $level < count($servers))
        {
            ++$level;
            $this->memcache = new Memcache();
            $server = trim($servers[array_rand($servers)]);

            // Normal host names do not contain slashes, while e.g. unix sockets do. Assume alternative transport pipe with port 0.
            if (strpos($server, '/') !== false)
                $host = $server;
            else
            {
                $server = explode(':', $server);
                $host = $server[0];
                $port = isset($server[1]) ? $server[1] : 11211;
            }

            // Don't wait too long: yes, we want the server, but we might be able to run the query faster!
            if (empty($db_persist))
                $connected = $this->memcache->connect($host, $port);
            else
                $connected = $this->memcache->pconnect($host, $port);
        }

        return $connected;
    }

    /**
     * {@inheritDoc}
     */
    public function getData($key, $ttl = null)
    {
        $key = $this->prefix . strtr($key, ':/', '-_');

        $value = $this->memcache->get($key);

        // $value should return either data or false (from failure, key not found or empty array).
        if ($value === false)
            return null;
        return $value;
    }

    /**
     * {@inheritDoc}
     */
    public function putData($key, $value, $ttl = null)
    {
        $key = $this->prefix . strtr($key, ':/', '-_');

        return $this->memcache->set($key, $value, 0, $ttl);
    }

    /**
     * {@inheritDoc}
     */
    public function quit()
    {
        return $this->memcache->close();
    }

    /**
     * {@inheritDoc}
     */
    public function cleanCache($type = '')
    {
        $this->invalidateCache();
        return $this->memcache->flush();
    }

    /**
     * {@inheritDoc}
     */
    public function cacheSettings(array &$config_vars)
    {
        global $context, $txt;

        $config_vars[] = $txt['cache_memcache_settings'];
        $config_vars[] = array('cache_memcached', $txt['cache_memcache_servers'], 'file', 'text', 0, 'cache_memcached', 'postinput' => '<br><div class="smalltext"><em>' . $txt['cache_memcache_servers_subtext'] . '</em></div>');

        if (!isset($context['settings_post_javascript']))
            $context['settings_post_javascript'] = '';

        $context['settings_post_javascript'] .= '
            $("#cache_accelerator").change(function (e) {
                var cache_type = e.currentTarget.value;
                $("#cache_memcached").prop("disabled", cache_type != "memcache");
            });';
    }

    /**
     * {@inheritDoc}
     */
    public function getVersion()
    {
        return $this->memcache->getVersion();
    }
}

?>