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<?php
/**
* The object cache class.
*
* @since 1.8
* @package LiteSpeed
*/
namespace LiteSpeed;
defined( 'WPINC' ) || exit();
require_once dirname( __DIR__ ) . '/autoload.php';
/**
* Object cache handler using Redis or Memcached.
*
* NOTE: this class may be included without initialized core.
*
* @since 1.8
*/
class Object_Cache extends Root {
const LOG_TAG = '[Object_Cache]';
/**
* Debug option key.
*
* @var string
*/
const O_DEBUG = 'debug';
/**
* Object cache enable key.
*
* @var string
*/
const O_OBJECT = 'object';
/**
* Object kind (Redis/Memcached).
*
* @var string
*/
const O_OBJECT_KIND = 'object-kind';
/**
* Object host.
*
* @var string
*/
const O_OBJECT_HOST = 'object-host';
/**
* Object port.
*
* @var string
*/
const O_OBJECT_PORT = 'object-port';
/**
* Object life/TTL.
*
* @var string
*/
const O_OBJECT_LIFE = 'object-life';
/**
* Persistent connection flag.
*
* @var string
*/
const O_OBJECT_PERSISTENT = 'object-persistent';
/**
* Admin cache flag.
*
* @var string
*/
const O_OBJECT_ADMIN = 'object-admin';
/**
* Transients store flag.
*
* @var string
*/
const O_OBJECT_TRANSIENTS = 'object-transients';
/**
* DB index for Redis.
*
* @var string
*/
const O_OBJECT_DB_ID = 'object-db_id';
/**
* Username for auth.
*
* @var string
*/
const O_OBJECT_USER = 'object-user';
/**
* Password for auth.
*
* @var string
*/
const O_OBJECT_PSWD = 'object-pswd';
/**
* Global groups list.
*
* @var string
*/
const O_OBJECT_GLOBAL_GROUPS = 'object-global_groups';
/**
* Non-persistent groups list.
*
* @var string
*/
const O_OBJECT_NON_PERSISTENT_GROUPS = 'object-non_persistent_groups';
/**
* Connection instance.
*
* @var \Redis|\Memcached|null
*/
private $_conn;
/**
* Debug config.
*
* @var bool
*/
private $_cfg_debug;
/**
* Whether OC is enabled.
*
* @var bool
*/
private $_cfg_enabled;
/**
* True => Redis, false => Memcached.
*
* @var bool
*/
private $_cfg_method;
/**
* Host name.
*
* @var string
*/
private $_cfg_host;
/**
* Port number.
*
* @var int|string
*/
private $_cfg_port;
/**
* TTL in seconds.
*
* @var int
*/
private $_cfg_life;
/**
* Use persistent connection.
*
* @var bool
*/
private $_cfg_persistent;
/**
* Cache admin pages.
*
* @var bool
*/
private $_cfg_admin;
/**
* Store transients.
*
* @var bool
*/
private $_cfg_transients;
/**
* Redis DB index.
*
* @var int
*/
private $_cfg_db;
/**
* Auth username.
*
* @var string
*/
private $_cfg_user;
/**
* Auth password.
*
* @var string
*/
private $_cfg_pswd;
/**
* Default TTL in seconds.
*
* @var int
*/
private $_default_life = 360;
/**
* 'Redis' or 'Memcached'.
*
* @var string
*/
private $_oc_driver = 'Memcached'; // Redis or Memcached.
/**
* Global groups.
*
* @var array
*/
private $_global_groups = array();
/**
* Non-persistent groups.
*
* @var array
*/
private $_non_persistent_groups = array();
/**
* Init.
*
* NOTE: this class may be included without initialized core.
*
* @since 1.8
*
* @param array|false $cfg Optional configuration to bootstrap without core.
*/
public function __construct( $cfg = false ) {
if ( $cfg ) {
if ( ! is_array( $cfg[ Base::O_OBJECT_GLOBAL_GROUPS ] ) ) {
$cfg[ Base::O_OBJECT_GLOBAL_GROUPS ] = explode( "\n", $cfg[ Base::O_OBJECT_GLOBAL_GROUPS ] );
}
if ( ! is_array( $cfg[ Base::O_OBJECT_NON_PERSISTENT_GROUPS ] ) ) {
$cfg[ Base::O_OBJECT_NON_PERSISTENT_GROUPS ] = explode( "\n", $cfg[ Base::O_OBJECT_NON_PERSISTENT_GROUPS ] );
}
$this->_cfg_debug = $cfg[ Base::O_DEBUG ] ? $cfg[ Base::O_DEBUG ] : false;
$this->_cfg_method = $cfg[ Base::O_OBJECT_KIND ] ? true : false;
$this->_cfg_host = $cfg[ Base::O_OBJECT_HOST ];
$this->_cfg_port = $cfg[ Base::O_OBJECT_PORT ];
$this->_cfg_life = $cfg[ Base::O_OBJECT_LIFE ];
$this->_cfg_persistent = $cfg[ Base::O_OBJECT_PERSISTENT ];
$this->_cfg_admin = $cfg[ Base::O_OBJECT_ADMIN ];
$this->_cfg_transients = $cfg[ Base::O_OBJECT_TRANSIENTS ];
$this->_cfg_db = $cfg[ Base::O_OBJECT_DB_ID ];
$this->_cfg_user = $cfg[ Base::O_OBJECT_USER ];
$this->_cfg_pswd = $cfg[ Base::O_OBJECT_PSWD ];
$this->_global_groups = $cfg[ Base::O_OBJECT_GLOBAL_GROUPS ];
$this->_non_persistent_groups = $cfg[ Base::O_OBJECT_NON_PERSISTENT_GROUPS ];
if ( $this->_cfg_method ) {
$this->_oc_driver = 'Redis';
}
$this->_cfg_enabled = $cfg[ Base::O_OBJECT ] && class_exists( $this->_oc_driver ) && $this->_cfg_host;
} elseif ( defined( 'LITESPEED_CONF_LOADED' ) ) { // If OC is OFF, will hit here to init OC after conf initialized
$this->_cfg_debug = $this->conf( Base::O_DEBUG ) ? $this->conf( Base::O_DEBUG ) : false;
$this->_cfg_method = $this->conf( Base::O_OBJECT_KIND ) ? true : false;
$this->_cfg_host = $this->conf( Base::O_OBJECT_HOST );
$this->_cfg_port = $this->conf( Base::O_OBJECT_PORT );
$this->_cfg_life = $this->conf( Base::O_OBJECT_LIFE );
$this->_cfg_persistent = $this->conf( Base::O_OBJECT_PERSISTENT );
$this->_cfg_admin = $this->conf( Base::O_OBJECT_ADMIN );
$this->_cfg_transients = $this->conf( Base::O_OBJECT_TRANSIENTS );
$this->_cfg_db = $this->conf( Base::O_OBJECT_DB_ID );
$this->_cfg_user = $this->conf( Base::O_OBJECT_USER );
$this->_cfg_pswd = $this->conf( Base::O_OBJECT_PSWD );
$this->_global_groups = $this->conf( Base::O_OBJECT_GLOBAL_GROUPS );
$this->_non_persistent_groups = $this->conf( Base::O_OBJECT_NON_PERSISTENT_GROUPS );
if ( $this->_cfg_method ) {
$this->_oc_driver = 'Redis';
}
$this->_cfg_enabled = $this->conf( Base::O_OBJECT ) && class_exists( $this->_oc_driver ) && $this->_cfg_host;
} elseif ( defined( 'self::CONF_FILE' ) && file_exists( WP_CONTENT_DIR . '/' . self::CONF_FILE ) ) {
// Get cfg from _data_file.
// Use self::const to avoid loading more classes.
$cfg = \json_decode( file_get_contents( WP_CONTENT_DIR . '/' . self::CONF_FILE ), true );
if ( ! empty( $cfg[ self::O_OBJECT_HOST ] ) ) {
$this->_cfg_debug = ! empty( $cfg[ Base::O_DEBUG ] ) ? $cfg[ Base::O_DEBUG ] : false;
$this->_cfg_method = ! empty( $cfg[ self::O_OBJECT_KIND ] ) ? $cfg[ self::O_OBJECT_KIND ] : false;
$this->_cfg_host = $cfg[ self::O_OBJECT_HOST ];
$this->_cfg_port = $cfg[ self::O_OBJECT_PORT ];
$this->_cfg_life = ! empty( $cfg[ self::O_OBJECT_LIFE ] ) ? $cfg[ self::O_OBJECT_LIFE ] : $this->_default_life;
$this->_cfg_persistent = ! empty( $cfg[ self::O_OBJECT_PERSISTENT ] ) ? $cfg[ self::O_OBJECT_PERSISTENT ] : false;
$this->_cfg_admin = ! empty( $cfg[ self::O_OBJECT_ADMIN ] ) ? $cfg[ self::O_OBJECT_ADMIN ] : false;
$this->_cfg_transients = ! empty( $cfg[ self::O_OBJECT_TRANSIENTS ] ) ? $cfg[ self::O_OBJECT_TRANSIENTS ] : false;
$this->_cfg_db = ! empty( $cfg[ self::O_OBJECT_DB_ID ] ) ? $cfg[ self::O_OBJECT_DB_ID ] : 0;
$this->_cfg_user = ! empty( $cfg[ self::O_OBJECT_USER ] ) ? $cfg[ self::O_OBJECT_USER ] : '';
$this->_cfg_pswd = ! empty( $cfg[ self::O_OBJECT_PSWD ] ) ? $cfg[ self::O_OBJECT_PSWD ] : '';
$this->_global_groups = ! empty( $cfg[ self::O_OBJECT_GLOBAL_GROUPS ] ) ? $cfg[ self::O_OBJECT_GLOBAL_GROUPS ] : array();
$this->_non_persistent_groups = ! empty( $cfg[ self::O_OBJECT_NON_PERSISTENT_GROUPS ] ) ? $cfg[ self::O_OBJECT_NON_PERSISTENT_GROUPS ] : array();
if ( $this->_cfg_method ) {
$this->_oc_driver = 'Redis';
}
$this->_cfg_enabled = class_exists( $this->_oc_driver ) && $this->_cfg_host;
} else {
$this->_cfg_enabled = false;
}
} else {
$this->_cfg_enabled = false;
}
}
/**
* Add debug.
*
* @since 6.3
* @access private
*
* @param string $text Log text.
* @return void
*/
private function debug_oc( $text ) {
if ( defined( 'LSCWP_LOG' ) ) {
self::debug( $text );
return;
}
if ( Base::VAL_ON2 !== $this->_cfg_debug ) {
return;
}
$litespeed_data_folder = defined( 'LITESPEED_DATA_FOLDER' ) ? LITESPEED_DATA_FOLDER : 'litespeed';
$lscwp_content_dir = defined( 'LSCWP_CONTENT_DIR' ) ? LSCWP_CONTENT_DIR : WP_CONTENT_DIR;
$litespeed_static_dir = $lscwp_content_dir . '/' . $litespeed_data_folder;
$log_path_prefix = $litespeed_static_dir . '/debug/';
$log_file = $log_path_prefix . Debug2::FilePath( 'debug' );
if ( file_exists( $log_path_prefix . 'index.php' ) && file_exists( $log_file ) ) {
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
error_log(gmdate('m/d/y H:i:s') . ' - OC - ' . $text . PHP_EOL, 3, $log_file);
}
}
/**
* Get `Store Transients` setting value.
*
* @since 1.8.3
* @access public
*
* @param string $group Group name.
* @return bool
*/
public function store_transients( $group ) {
return $this->_cfg_transients && $this->_is_transients_group( $group );
}
/**
* Check if the group belongs to transients or not.
*
* @since 1.8.3
* @access private
*
* @param string $group Group name.
* @return bool
*/
private function _is_transients_group( $group ) {
return in_array( $group, array( 'transient', 'site-transient' ), true );
}
/**
* Update WP object cache file config.
*
* @since 1.8
* @access public
*
* @param array $options Options to apply after update.
* @return void
*/
public function update_file( $options ) {
$changed = false;
// NOTE: When included in oc.php, `LSCWP_DIR` will show undefined, so this must be assigned/generated when used.
$_oc_ori_file = LSCWP_DIR . 'lib/object-cache.php';
$_oc_wp_file = WP_CONTENT_DIR . '/object-cache.php';
// Update cls file.
if ( ! file_exists( $_oc_wp_file ) || md5_file( $_oc_wp_file ) !== md5_file( $_oc_ori_file ) ) {
$this->debug_oc( 'copying object-cache.php file to ' . $_oc_wp_file );
copy( $_oc_ori_file, $_oc_wp_file );
$changed = true;
}
/**
* Clear object cache.
*/
if ( $changed ) {
$this->_reconnect( $options );
}
}
/**
* Remove object cache file.
*
* @since 1.8.2
* @access public
*
* @return void
*/
public function del_file() {
// NOTE: When included in oc.php, `LSCWP_DIR` will show undefined, so this must be assigned/generated when used.
$_oc_ori_file = LSCWP_DIR . 'lib/object-cache.php';
$_oc_wp_file = WP_CONTENT_DIR . '/object-cache.php';
if ( file_exists( $_oc_wp_file ) && md5_file( $_oc_wp_file ) === md5_file( $_oc_ori_file ) ) {
$this->debug_oc( 'removing ' . $_oc_wp_file );
wp_delete_file( $_oc_wp_file );
}
}
/**
* Try to build connection.
*
* @since 1.8
* @access public
*
* @return bool|null False on failure, true on success, null if unsupported.
*/
public function test_connection() {
return $this->_connect();
}
/**
* Force to connect with this setting.
*
* @since 1.8
* @access private
*
* @param array $cfg Reconnect configuration.
* @return void
*/
private function _reconnect( $cfg ) {
$this->debug_oc( 'Reconnecting' );
if ( isset( $this->_conn ) ) {
// error_log( 'Object: Quitting existing connection!' );
$this->debug_oc( 'Quitting existing connection' );
$this->flush();
$this->_conn = null;
$this->cls( false, true );
}
$cls = $this->cls( false, false, $cfg );
$cls->_connect();
if ( isset( $cls->_conn ) ) {
$cls->flush();
}
}
/**
* Connect to Memcached/Redis server.
*
* @since 1.8
* @access private
*
* @return bool|null False on failure, true on success, null if driver missing.
*/
private function _connect() {
if ( isset( $this->_conn ) ) {
// error_log( 'Object: _connected' );
return true;
}
if ( ! class_exists( $this->_oc_driver ) || ! $this->_cfg_host ) {
$this->debug_oc( '_oc_driver cls non existed or _cfg_host missed: ' . $this->_oc_driver . ' [_cfg_host] ' . $this->_cfg_host . ':' . $this->_cfg_port );
return null;
}
if ( defined( 'LITESPEED_OC_FAILURE' ) ) {
$this->debug_oc( 'LITESPEED_OC_FAILURE const defined' );
return false;
}
$this->debug_oc( 'Init ' . $this->_oc_driver . ' connection to ' . $this->_cfg_host . ':' . $this->_cfg_port );
$failed = false;
/**
* Connect to Redis.
*
* @since 1.8.1
* @see https://github.com/phpredis/phpredis/#example-1
*/
if ( 'Redis' === $this->_oc_driver ) {
// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_set_error_handler
set_error_handler( 'litespeed_exception_handler' );
try {
$this->_conn = new \Redis();
// error_log( 'Object: _connect Redis' );
if ( $this->_cfg_persistent ) {
if ( $this->_cfg_port ) {
$this->_conn->pconnect( $this->_cfg_host, $this->_cfg_port );
} else {
$this->_conn->pconnect( $this->_cfg_host );
}
} elseif ( $this->_cfg_port ) {
$this->_conn->connect( $this->_cfg_host, $this->_cfg_port );
} else {
$this->_conn->connect( $this->_cfg_host );
}
if ( $this->_cfg_pswd ) {
if ( $this->_cfg_user ) {
$this->_conn->auth( array( $this->_cfg_user, $this->_cfg_pswd ) );
} else {
$this->_conn->auth( $this->_cfg_pswd );
}
}
if (defined('Redis::OPT_REPLY_LITERAL')) {
$this->debug_oc( 'Redis set OPT_REPLY_LITERAL' );
$this->_conn->setOption(\Redis::OPT_REPLY_LITERAL, true);
}
if ( $this->_cfg_db ) {
$this->_conn->select( $this->_cfg_db );
}
$res = $this->_conn->rawCommand('PING');
if ( 'PONG' !== $res ) {
$this->debug_oc( 'Redis resp is wrong: ' . $res );
$failed = true;
}
} catch ( \Exception $e ) {
$this->debug_oc( 'Redis connect exception: ' . $e->getMessage() );
$failed = true;
} catch ( \ErrorException $e ) {
$this->debug_oc( 'Redis connect error: ' . $e->getMessage() );
$failed = true;
}
restore_error_handler();
} else {
// Connect to Memcached.
if ( $this->_cfg_persistent ) {
$this->_conn = new \Memcached( $this->_get_mem_id() );
// Check memcached persistent connection.
if ( $this->_validate_mem_server() ) {
// error_log( 'Object: _validate_mem_server' );
$this->debug_oc( 'Got persistent ' . $this->_oc_driver . ' connection' );
return true;
}
$this->debug_oc( 'No persistent ' . $this->_oc_driver . ' server list!' );
} else {
// error_log( 'Object: new memcached!' );
$this->_conn = new \Memcached();
}
$this->_conn->addServer( $this->_cfg_host, (int) $this->_cfg_port );
/**
* Add SASL auth.
*
* @since 1.8.1
* @since 2.9.6 Fixed SASL connection @see https://www.litespeedtech.com/support/wiki/doku.php/litespeed_wiki:lsmcd:new_sasl
*/
if ( $this->_cfg_user && $this->_cfg_pswd && method_exists( $this->_conn, 'setSaslAuthData' ) ) {
$this->_conn->setOption( \Memcached::OPT_BINARY_PROTOCOL, true );
$this->_conn->setOption( \Memcached::OPT_COMPRESSION, false );
$this->_conn->setSaslAuthData( $this->_cfg_user, $this->_cfg_pswd );
}
// Check connection.
if ( ! $this->_validate_mem_server() ) {
$failed = true;
}
}
// If failed to connect.
if ( $failed ) {
$this->debug_oc( '❌ Failed to connect ' . $this->_oc_driver . ' server!' );
$this->_conn = null;
$this->_cfg_enabled = false;
! defined( 'LITESPEED_OC_FAILURE' ) && define( 'LITESPEED_OC_FAILURE', true );
// error_log( 'Object: false!' );
return false;
}
$this->debug_oc( '✅ Connected to ' . $this->_oc_driver . ' server.' );
return true;
}
/**
* Check if the connected memcached host is the one in cfg.
*
* @since 1.8
* @access private
*
* @return bool
*/
private function _validate_mem_server() {
$mem_list = $this->_conn->getStats();
if ( empty( $mem_list ) ) {
return false;
}
foreach ( $mem_list as $k => $v ) {
if ( substr( $k, 0, strlen( $this->_cfg_host ) ) !== $this->_cfg_host ) {
continue;
}
if ( ! empty( $v['pid'] ) || ! empty( $v['curr_connections'] ) ) {
return true;
}
}
return false;
}
/**
* Get memcached unique id to be used for connecting.
*
* @since 1.8
* @access private
*
* @return string
*/
private function _get_mem_id() {
$mem_id = 'litespeed';
if ( is_multisite() ) {
$mem_id .= '_' . get_current_blog_id();
}
return $mem_id;
}
/**
* Get cache.
*
* @since 1.8
* @access public
*
* @param string $key Cache key.
* @return mixed|null
*/
public function get( $key ) {
if ( ! $this->_cfg_enabled ) {
return null;
}
if ( ! $this->_can_cache() ) {
return null;
}
if ( ! $this->_connect() ) {
return null;
}
$res = $this->_conn->get( $key );
return $res;
}
/**
* Set cache.
*
* @since 1.8
* @access public
*
* @param string $key Cache key.
* @param mixed $data Data to store.
* @param int $expire TTL seconds.
* @return bool|null
*/
public function set( $key, $data, $expire ) {
if ( ! $this->_cfg_enabled ) {
return null;
}
/**
* To fix the Cloud callback cached as its frontend call but the hash is generated in backend
* Bug found by Stan at Jan/10/2020
*/
// if ( ! $this->_can_cache() ) {
// return null;
// }
if ( ! $this->_connect() ) {
return null;
}
$ttl = $expire ? $expire : $this->_cfg_life;
if ( 'Redis' === $this->_oc_driver ) {
try {
$res = $this->_conn->setEx( $key, $ttl, $data );
} catch ( \RedisException $ex ) {
$res = false;
$msg = sprintf( __( 'Redis encountered a fatal error: %1$s (code: %2$d)', 'litespeed-cache' ), $ex->getMessage(), $ex->getCode() );
$this->debug_oc( $msg );
Admin_Display::error( $msg );
}
} else {
$res = $this->_conn->set( $key, $data, $ttl );
}
return $res;
}
/**
* Check if can cache or not.
*
* @since 1.8
* @access private
*
* @return bool
*/
private function _can_cache() {
if ( ! $this->_cfg_admin && defined( 'WP_ADMIN' ) ) {
return false;
}
return true;
}
/**
* Delete cache.
*
* @since 1.8
* @access public
*
* @param string $key Cache key.
* @return bool|null
*/
public function delete( $key ) {
if ( ! $this->_cfg_enabled ) {
return null;
}
if ( ! $this->_connect() ) {
return null;
}
if ( 'Redis' === $this->_oc_driver ) {
$res = $this->_conn->del( $key );
} else {
$res = $this->_conn->delete( $key );
}
return (bool) $res;
}
/**
* Clear all cache.
*
* @since 1.8
* @access public
*
* @return bool|null
*/
public function flush() {
if ( ! $this->_cfg_enabled ) {
$this->debug_oc( 'bypass flushing' );
return null;
}
if ( ! $this->_connect() ) {
return null;
}
$this->debug_oc( 'flush!' );
if ( 'Redis' === $this->_oc_driver ) {
$res = $this->_conn->flushDb();
} else {
$res = $this->_conn->flush();
$this->_conn->resetServerList();
}
return $res;
}
/**
* Add global groups.
*
* @since 1.8
* @access public
*
* @param string|string[] $groups Group(s) to add.
* @return void
*/
public function add_global_groups( $groups ) {
if ( ! is_array( $groups ) ) {
$groups = array( $groups );
}
$this->_global_groups = array_merge( $this->_global_groups, $groups );
$this->_global_groups = array_unique( $this->_global_groups );
}
/**
* Check if is in global groups or not.
*
* @since 1.8
* @access public
*
* @param string $group Group name.
* @return bool
*/
public function is_global( $group ) {
return in_array( $group, $this->_global_groups, true );
}
/**
* Add non persistent groups.
*
* @since 1.8
* @access public
*
* @param string|string[] $groups Group(s) to add.
* @return void
*/
public function add_non_persistent_groups( $groups ) {
if ( ! is_array( $groups ) ) {
$groups = array( $groups );
}
$this->_non_persistent_groups = array_merge( $this->_non_persistent_groups, $groups );
$this->_non_persistent_groups = array_unique( $this->_non_persistent_groups );
}
/**
* Check if is in non persistent groups or not.
*
* @since 1.8
* @access public
*
* @param string $group Group name.
* @return bool
*/
public function is_non_persistent( $group ) {
return in_array( $group, $this->_non_persistent_groups, true );
}
}