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<?php
/**
* File: ConfigCache.php
*
* @package W3TC
*/
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
*
* @param int $blog_id Blog ID.
* @param bool $preview Preview flag.
*
* @return array|null
*/
public static 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
*
* @param int $blog_id Blog ID.
* @param bool $preview Preview flag.
*/
public static 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 ) );
}
/**
* Saves config cache entry.
*
* @param int $blog_id Blog ID.
* @param bool $preview Preview flag.
* @param mixed $data Data.
*/
public static function save_item( $blog_id, $preview, $data ) {
$cache = self::get_cache();
$cache->set( self::get_key( $blog_id, $preview ), $data );
}
/**
* Retrieves cache instance.
*
* @return object
*/
private static function get_cache() {
static $cache = null;
if ( ! is_null( $cache ) ) {
return $cache;
}
switch ( W3TC_CONFIG_CACHE_ENGINE ) {
case 'memcached':
$engine_config = 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':
$engine_config = array(
'servers' =>
explode( ',', W3TC_CONFIG_CACHE_REDIS_SERVERS ),
'verify_tls_certificates' =>
( defined( 'W3TC_CONFIG_CACHE_REDIS_VERIFY_TLS_CERTIFICATES' ) ?
W3TC_CONFIG_CACHE_REDIS_VERIFY_TLS_CERTIFICATES : true ),
'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:
$engine_config = array();
}
$engine_config['blog_id'] = '0';
$engine_config['module'] = 'config';
$engine_config['host'] = '';
$engine_config['instance_id'] = ( defined( 'W3TC_INSTANCE_ID' ) ? W3TC_INSTANCE_ID : 0 );
$cache = Cache::instance( W3TC_CONFIG_CACHE_ENGINE, $engine_config );
return $cache;
}
/**
* Retrieves config cache key.
*
* @param int $blog_id Blog ID.
* @param bool $preview Preview flag.
*
* @return string
*/
private static function get_key( $blog_id, $preview ) {
return 'w3tc_config_' . $blog_id . ( $preview ? '_preview' : '' );
}
}