<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\cache\driver;
/**
* ACM Abstract Memory Class
*/
abstract class memory extends \phpbb\cache\driver\base
{
var $key_prefix;
/**
* Set cache path
*/
function __construct()
{
global $dbname, $table_prefix, $phpbb_container;
$this->cache_dir = $phpbb_container->getParameter('core.cache_dir');
$this->key_prefix = substr(md5($dbname . $table_prefix), 0, 8) . '_';
if (!isset($this->extension) || !extension_loaded($this->extension))
{
global $acm_type;
trigger_error("Could not find required extension [{$this->extension}] for the ACM module $acm_type.", E_USER_ERROR);
}
if (isset($this->function) && !function_exists($this->function))
{
global $acm_type;
trigger_error("The required function [{$this->function}] is not available for the ACM module $acm_type.", E_USER_ERROR);
}
}
/**
* {@inheritDoc}
*/
function load()
{
// grab the global cache
$data = $this->_read('global');
if ($data !== false)
{
$this->vars = $data;
return true;
}
return false;
}
/**
* {@inheritDoc}
*/
function save()
{
if (!$this->is_modified)
{
return;
}
$this->_write('global', $this->vars, 2592000);
$this->is_modified = false;
}
/**
* {@inheritDoc}
*/
function tidy()
{
global $config;
// cache has auto GC, no need to have any code here :)
$config->set('cache_last_gc', time(), false);
}
/**
* {@inheritDoc}
*/
function get($var_name)
{
if ($var_name[0] == '_')
{
if (!$this->_exists($var_name))
{
return false;
}
return $this->_read($var_name);
}
else
{
return ($this->_exists($var_name)) ? $this->vars[$var_name] : false;
}
}
/**
* {@inheritDoc}
*/
function put($var_name, $var, $ttl = 2592000)
{
if ($var_name[0] == '_')
{
$this->_write($var_name, $var, $ttl);
}
else
{
$this->vars[$var_name] = $var;
$this->is_modified = true;
}
}
/**
* {@inheritDoc}
*/
function destroy($var_name, $table = '')
{
if ($var_name == 'sql' && !empty($table))
{
if (!is_array($table))
{
$table = array($table);
}
foreach ($table as $table_name)
{
// gives us the md5s that we want
$temp = $this->_read('sql_' . $table_name);
if ($temp === false)
{
continue;
}
// delete each query ref
foreach ($temp as $md5_id => $void)
{
$this->_delete('sql_' . $md5_id);
}
// delete the table ref
$this->_delete('sql_' . $table_name);
}
return;
}
if (!$this->_exists($var_name))
{
return;
}
if ($var_name[0] == '_')
{
$this->_delete($var_name);
}
else if (isset($this->vars[$var_name]))
{
$this->is_modified = true;
unset($this->vars[$var_name]);
// We save here to let the following cache hits succeed
$this->save();
}
}
/**
* {@inheritDoc}
*/
function _exists($var_name)
{
if ($var_name[0] == '_')
{
return $this->_isset($var_name);
}
else
{
if (!count($this->vars))
{
$this->load();
}
return isset($this->vars[$var_name]);
}
}
/**
* {@inheritDoc}
*/
function sql_save(\phpbb\db\driver\driver_interface $db, $query, $query_result, $ttl)
{
// Remove extra spaces and tabs
$query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
$query_id = md5($query);
// determine which tables this query belongs to
// Some queries use backticks, namely the get_database_size() query
// don't check for conformity, the SQL would error and not reach here.
if (!preg_match_all('/(?:FROM \\(?(`?\\w+`?(?: \\w+)?(?:, ?`?\\w+`?(?: \\w+)?)*)\\)?)|(?:JOIN (`?\\w+`?(?: \\w+)?))/', $query, $regs, PREG_SET_ORDER))
{
// Bail out if the match fails.
return $query_result;
}
$tables = array();
foreach ($regs as $match)
{
if ($match[0][0] == 'F')
{
$tables = array_merge($tables, array_map('trim', explode(',', $match[1])));
}
else
{
$tables[] = $match[2];
}
}
foreach ($tables as $table_name)
{
// Remove backticks
$table_name = ($table_name[0] == '`') ? substr($table_name, 1, -1) : $table_name;
if (($pos = strpos($table_name, ' ')) !== false)
{
$table_name = substr($table_name, 0, $pos);
}
$temp = $this->_read('sql_' . $table_name);
if ($temp === false)
{
$temp = array();
}
$temp[$query_id] = true;
// This must never expire
$this->_write('sql_' . $table_name, $temp, 0);
}
// store them in the right place
$this->sql_rowset[$query_id] = array();
$this->sql_row_pointer[$query_id] = 0;
while ($row = $db->sql_fetchrow($query_result))
{
$this->sql_rowset[$query_id][] = $row;
}
$db->sql_freeresult($query_result);
$this->_write('sql_' . $query_id, $this->sql_rowset[$query_id], $ttl);
return $query_id;
}
/**
* Check if a cache var exists
*
* @access protected
* @param string $var Cache key
* @return bool True if it exists, otherwise false
*/
function _isset($var)
{
// Most caches don't need to check
return true;
}
}