<?php
namespace W3TC;
/**
* Provides access to config cache, used mostly when config is stored in
* database to not issue config loading database queries on each http request
*/
class ConfigCache {
/**
* Reads config from config cache
*/
static public function util_array_from_storage( $blog_id, $preview ) {
$cache = self::get_cache();
$config = $cache->get( self::get_key( $blog_id, $preview ) );
if ( is_array( $config ) ) {
return $config;
}
return null;
}
/**
* Removes config cache entry so that it can be read from original source
* on next attempt
*/
static public function remove_item( $blog_id, $preview ) {
$cache = self::get_cache();
$cache->hard_delete( self::get_key( $blog_id, false ) );
$cache->hard_delete( self::get_key( $blog_id, true ) );
}
static public function save_item( $blog_id, $preview, $data ) {
$cache = self::get_cache();
$cache->set( self::get_key( $blog_id, $preview ), $data );
}
static private function get_cache() {
static $cache = null;
if ( !is_null( $cache ) ) {
return $cache;
}
switch ( W3TC_CONFIG_CACHE_ENGINE ) {
case 'memcached':
$engineConfig = array(
'servers' => explode( ',', W3TC_CONFIG_CACHE_MEMCACHED_SERVERS ),
'persistent' =>
( defined( 'W3TC_CONFIG_CACHE_MEMCACHED_PERSISTENT' ) ?
W3TC_CONFIG_CACHE_MEMCACHED_PERSISTENT : true ),
'aws_autodiscovery' =>
( defined( 'W3TC_CONFIG_CACHE_MEMCACHED_AWS_AUTODISCOVERY' ) ?
W3TC_CONFIG_CACHE_MEMCACHED_AWS_AUTODISCOVERY : false ),
'username' =>
( defined( 'W3TC_CONFIG_CACHE_MEMCACHED_USERNAME' ) ?
W3TC_CONFIG_CACHE_MEMCACHED_USERNAME : '' ),
'password' =>
( defined( 'W3TC_CONFIG_CACHE_MEMCACHED_PASSWORD' ) ?
W3TC_CONFIG_CACHE_MEMCACHED_PASSWORD : '' ),
'key_version_mode' => 'disabled'
);
break;
case 'redis':
$engineConfig = array(
'servers' => explode( ',', W3TC_CONFIG_CACHE_REDIS_SERVERS ),
'persistent' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_PERSISTENT' ) ?
W3TC_CONFIG_CACHE_REDIS_PERSISTENT : true ),
'dbid' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_DBID' ) ?
W3TC_CONFIG_CACHE_REDIS_DBID : 0 ),
'password' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_PASSWORD' ) ?
W3TC_CONFIG_CACHE_REDIS_PASSWORD : '' ),
'timeout' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_TIMEOUT' ) ?
W3TC_CONFIG_CACHE_REDIS_TIMEOUT : 0 ),
'retry_interval' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_RETRY_INTERVAL' ) ?
W3TC_CONFIG_CACHE_REDIS_RETRY_INTERVAL : 0 ),
'read_timeout' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_READ_TIMEOUT' ) ?
W3TC_CONFIG_CACHE_REDIS_READ_TIMEOUT : 0 ),
'key_version_mode' => 'disabled'
);
break;
default:
$engineConfig = array();
}
$engineConfig['blog_id'] = '0';
$engineConfig['module'] = 'config';
$engineConfig['host'] = '';
$engineConfig['instance_id'] =
( defined( 'W3TC_INSTANCE_ID' ) ? W3TC_INSTANCE_ID : 0 );
$cache = Cache::instance( W3TC_CONFIG_CACHE_ENGINE, $engineConfig );
return $cache;
}
static private function get_key( $blog_id, $preview ) {
return 'w3tc_config_' . $blog_id . ( $preview ? '_preview' : '' );
}
}