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<?php
/**
* File: Cache_Eaccelerator.php
*
* @package W3TC
*/
namespace W3TC;
/**
* Class Cache_Eaccelerator
*
* phpcs:disable PSR2.Classes.PropertyDeclaration.Underscore
* phpcs:disable PSR2.Methods.MethodDeclaration.Underscore
* phpcs:disable WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
* phpcs:disable WordPress.PHP.DiscouragedPHPFunctions.serialize_unserialize
* phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged
*/
class Cache_Eaccelerator extends Cache_Base {
/**
* Used for faster flushing
*
* @var integer $_key_postfix
*/
private $_key_version = array();
/**
* Adds data
*
* @param string $key Key.
* @param mixed $value Value.
* @param integer $expire Time to expire.
* @param string $group Used to differentiate between groups of cache values.
*
* @return boolean
*/
public function add( $key, &$value, $expire = 0, $group = '' ) {
if ( $this->get( $key, $group ) === false ) {
return $this->set( $key, $value, $expire, $group );
}
return false;
}
/**
* Sets data
*
* @param string $key Key.
* @param mixed $value Value.
* @param integer $expire Time to expire.
* @param string $group Used to differentiate between groups of cache values.
*
* @return boolean
*/
public function set( $key, $value, $expire = 0, $group = '' ) {
if ( ! isset( $value['key_version'] ) ) {
$value['key_version'] = $this->_get_key_version( $group );
}
$storage_key = $this->get_item_key( $key );
return eaccelerator_put( $storage_key, serialize( $value ), $expire );
}
/**
* Returns data
*
* @param string $key Key.
* @param string $group Used to differentiate between groups of cache values.
*
* @return mixed
*/
public function get_with_old( $key, $group = '' ) {
$has_old_data = false;
$storage_key = $this->get_item_key( $key );
$v = @unserialize( eaccelerator_get( $storage_key ) );
if ( ! is_array( $v ) || ! isset( $v['key_version'] ) ) {
return array( null, $has_old_data );
}
$key_version = $this->_get_key_version( $group );
if ( $v['key_version'] === $key_version ) {
return array( $v, $has_old_data );
}
if ( $v['key_version'] > $key_version ) {
if ( ! empty( $v['key_version_at_creation'] ) && $v['key_version_at_creation'] !== $key_version ) {
$this->_set_key_version( $v['key_version'], $group );
}
return array( $v, $has_old_data );
}
// key version is old.
if ( ! $this->_use_expired_data ) {
return array( null, $has_old_data );
}
// if we have expired data - update it for future use and let current process recalculate it.
$expires_at = isset( $v['expires_at'] ) ? $v['expires_at'] : null;
if ( null === $expires_at || time() > $expires_at ) {
$v['expires_at'] = time() + 30;
eaccelerator_put( $storage_key, serialize( $v ), 0 );
$has_old_data = true;
return array( null, $has_old_data );
}
// return old version.
return array( $v, $has_old_data );
}
/**
* Replaces data
*
* @param string $key Key.
* @param mixed $value Value.
* @param integer $expire Time to expire.
* @param string $group Used to differentiate between groups of cache values.
*
* @return boolean
*/
public function replace( $key, &$value, $expire = 0, $group = '' ) {
if ( $this->get( $key, $group ) !== false ) {
return $this->set( $key, $value, $expire, $group );
}
return false;
}
/**
* Deletes data
*
* @param string $key Key.
* @param string $group Group.
*
* @return boolean
*/
public function delete( $key, $group = '' ) {
$storage_key = $this->get_item_key( $key );
if ( $this->_use_expired_data ) {
$v = @unserialize( eaccelerator_get( $storage_key ) );
if ( is_array( $v ) ) {
$v['key_version'] = 0;
eaccelerator_put( $storage_key, serialize( $v ), 0 );
return true;
}
}
return eaccelerator_rm( $key . '_' . $this->_blog_id );
}
/**
* Deletes _old and primary if exists.
*
* @param string $key Key.
* @param string $group Group.
*
* @return bool
*/
public function hard_delete( $key, $group = '' ) {
$storage_key = $this->get_item_key( $key );
return eaccelerator_rm( $storage_key );
}
/**
* Flushes all data
*
* @param string $group Used to differentiate between groups of cache values.
*
* @return boolean
*/
public function flush( $group = '' ) {
$this->_get_key_version( $group ); // initialize $this->_key_version.
++$this->_key_version[ $group ];
$this->_set_key_version( $this->_key_version[ $group ], $group );
return true;
}
/**
* Gets a key extension for "ahead generation" mode.
* Used by AlwaysCached functionality to regenerate content
*
* @param string $group Used to differentiate between groups of cache values.
*
* @return array
*/
public function get_ahead_generation_extension( $group ) {
$v = $this->_get_key_version( $group );
return array(
'key_version' => $v + 1,
'key_version_at_creation' => $v,
);
}
/**
* Flushes group with before condition
*
* @param string $group Used to differentiate between groups of cache values.
* @param array $extension Used to set a condition what version to flush.
*
* @return void
*/
public function flush_group_after_ahead_generation( $group, $extension ) {
$v = $this->_get_key_version( $group );
if ( $extension['key_version'] > $v ) {
$this->_set_key_version( $extension['key_version'], $group );
}
}
/**
* Checks if engine can function properly in this environment
*
* @return bool
*/
public function available() {
return function_exists( 'eaccelerator_put' );
}
/**
* Returns key postfix
*
* @param string $group Used to differentiate between groups of cache values.
*
* @return integer
*/
private function _get_key_version( $group = '' ) {
if ( ! isset( $this->_key_version[ $group ] ) || $this->_key_version[ $group ] <= 0 ) {
$v = eaccelerator_get( $this->_get_key_version_key( $group ) );
$v = intval( $v );
$this->_key_version[ $group ] = ( $v > 0 ? $v : 1 );
}
return $this->_key_version[ $group ];
}
/**
* Sets new key version
*
* @param unknown $v Key.
* @param string $group Used to differentiate between groups of cache values.
*
* @return boolean
*/
private function _set_key_version( $v, $group = '' ) {
// cant guarantee atomic action here, filelocks fail often.
$value = $this->get( $key );
if ( isset( $old_value['content'] ) && $value['content'] !== $old_value['content'] ) {
return false;
}
return $this->set( $key, $new_value );
}
/**
* Used to replace as atomically as possible known value to new one
*
* @param string $key Key.
* @param mixed $old_value Old value.
* @param mixed $new_value New value.
*
* @return bool
*/
public function set_if_maybe_equals( $key, $old_value, $new_value ) {
// eaccelerator cache not supported anymore by its authors.
return false;
}
/**
* Use key as a counter and add integet value to it
*
* @param string $key Key.
* @param mixed $value Value.
*
* @return bool
*/
public function counter_add( $key, $value ) {
// eaccelerator cache not supported anymore by its authors.
return false;
}
/**
* Use key as a counter and add integet value to it
*
* @param string $key Key.
* @param mixed $value Value.
*
* @return bool
*/
public function counter_set( $key, $value ) {
// eaccelerator cache not supported anymore by its authors.
return false;
}
/**
* Get counter's value
*
* @param string $key Key.
*
* @return bool
*/
public function counter_get( $key ) {
// eaccelerator cache not supported anymore by its authors.
return false;
}
}