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<?php
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/**
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* @brief Database Output Cache Storage Class
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* @author <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
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* @copyright (c) Invision Power Services, Inc.
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* @license https://www.invisioncommunity.com/legal/standards/
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* @package Invision Community
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* @since 17 November 2018
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*/
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namespace IPS\Output\Cache;
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/* To prevent PHP errors (extending class does not exist) revealing path */
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if ( !\defined( '\IPS\SUITE_UNIQUE_KEY' ) )
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{
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header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
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exit;
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}
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/**
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* Remote Database Output Cache Storage Class
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*/
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class _RemoteDatabase extends \IPS\Output\Cache
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{
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/**
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* @brief Unpacked config
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*/
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protected static $config = NULL;
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/**
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* Server supports this method?
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*
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* @return bool
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*/
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public static function supported()
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{
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static::getConfig();
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return ( static::$config === NULL ) ? FALSE : TRUE;
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}
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/**
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* Unpack the config
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*
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* @return void
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*/
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protected static function getConfig()
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{
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if ( \defined('\IPS\OUTPUT_CACHE_METHOD_CONFIG') and \IPS\OUTPUT_CACHE_METHOD_CONFIG !== NULL )
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{
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static::$config = json_decode( \IPS\OUTPUT_CACHE_METHOD_CONFIG, TRUE );
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}
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}
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/**
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* @brief [ActiveRecord] Database Connection
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* @return \IPS\Db
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*/
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public static function db()
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{
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return \IPS\Db::i( 'remoteOutputCache', array(
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'sql_host' => static::$config['sql_host'],
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'sql_user' => static::$config['sql_user'],
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'sql_pass' => static::$config['sql_pass'],
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'sql_database' => static::$config['sql_database'],
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'sql_port' => static::$config['sql_port'],
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'sql_socket' => static::$config['sql_socket'],
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'sql_tbl_prefix'=> ( ! empty( static::$config['sql_tbl_prefix'] ) ) ? static::$config['sql_tbl_prefix'] : '',
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'sql_utf8mb4' => TRUE
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) );
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}
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/**
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* Ensure the remote DB connection is closed
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*
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* @return void
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*/
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public function __destruct()
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{
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static::db()->close();
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}
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/**
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* Fix any SQL issues
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*
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* @param \Exception $exception The exception object
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* @return boolean
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*/
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protected static function handleException( $exception )
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{
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if ( $exception->getCode() == 1017 or $exception->getCode() == 1146 )
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{
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/* Table does not exist */
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static::db()->createTable( static::getSchema() );
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return TRUE;
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}
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else if ( $exception->getCode() == 1054 )
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{
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/* Column doesn't exist, so drop table and recreate */
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static::db()->dropTable( 'core_output_cache' );
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static::db()->createTable( static::getSchema() );
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return TRUE;
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}
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/* Other errors we can't auto fix */
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return FALSE;
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}
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/**
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* Abstract Method: Get
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*
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* @param string $key Key
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* @return array
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* @throws \OutOfRangeException
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*/
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protected function _get( $key )
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{
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try
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{
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$data = static::db()->select( '*', 'core_output_cache', array( 'cache_key=?', $key,) )->first();
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$meta = array();
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if ( ! empty( $data['cache_meta'] ) )
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{
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$meta = json_decode( $data['cache_meta'], TRUE );
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}
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if ( $data['cache_expire'] <= time() )
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{
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throw new \UnderflowException;
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}
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return array( 'output' => $data['cache_value'], 'meta' => $meta, 'expires' => $data['cache_expire'] );
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}
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catch ( \UnderflowException $e )
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{
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throw new \OutOfRangeException;
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}
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catch ( \IPS\Db\Exception $e )
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{
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if ( static::handleException( $e ) === TRUE )
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{
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return $this->_get( $key );
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}
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}
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}
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/**
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* Store value using cache method if available or falling back to the database
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*
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* @param string $key Key
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* @param mixed $value Value
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* @param mixed $meta Meta data (contentType, headers, etc)
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* @param \IPS\DateTime $expire Expiration if using database
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* @return bool
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*/
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protected function _set( $key, $value, $meta, \IPS\DateTime $expire )
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{
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try
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{
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static::db()->replace( 'core_output_cache', array(
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'cache_key' => $key,
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'cache_value' => $value,
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'cache_meta' => json_encode( $meta ),
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'cache_expire' => $expire->getTimestamp()
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) );
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return TRUE;
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}
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catch ( \IPS\Db\Exception $e )
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{
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if ( static::handleException( $e ) === TRUE )
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{
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$this->_set( $key, $value, $meta, $expire );
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}
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}
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}
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/**
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* Remove all expired caches
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*
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* @param boolean $truncate Truncate the table
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* @return void
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*/
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public function deleteExpired( $truncate=FALSE )
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{
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try
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{
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static::db()->delete( 'core_output_cache', ( ! $truncate ? array( 'cache_expire<?', time() ) : NULL ) );
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}
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catch ( \IPS\Db\Exception $e )
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{
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if ( static::handleException( $e ) === TRUE )
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{
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$this->deleteExpired( $truncate );
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}
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}
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}
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/**
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* Abstract Method: Clear All Caches
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*
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* @return void
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*/
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public function clearAll()
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{
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try
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{
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static::db()->delete( 'core_output_cache' );
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}
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catch ( \IPS\Db\Exception $e )
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{
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if ( static::handleException( $e ) === TRUE )
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{
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$this->clearAll();
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}
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}
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}
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/**
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* Drop the tables
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*
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* @return void
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*/
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public function recreateTable()
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{
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try
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{
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static::db()->dropTable( 'core_output_cache' );
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static::db()->createTable( static::getSchema() );
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}
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catch ( \Exception $e ) { }
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}
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/**
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* Get schema
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*
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* @return mixed
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*/
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protected static function getSchema()
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{
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$schema = <<<EOF
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{
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"name": "core_output_cache",
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"columns": {
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"cache_key": {
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"allow_null": false,
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"auto_increment": false,
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"comment": "The key",
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"decimals": null,
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"default": "",
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"length": 100,
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"name": "cache_key",
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"type": "VARCHAR",
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"unsigned": false,
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"values": []
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},
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"cache_value": {
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"allow_null": false,
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"auto_increment": false,
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"comment": "The output HTML",
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"decimals": null,
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"default": "",
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"length": 0,
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"name": "cache_value",
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"type": "LONGTEXT",
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"unsigned": false,
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"values": []
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},
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"cache_meta": {
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"allow_null": false,
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"auto_increment": false,
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"comment": "JSON headers and meta data",
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"decimals": null,
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"default": "",
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"length": 0,
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"name": "cache_meta",
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"type": "MEDIUMTEXT",
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"unsigned": false,
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"values": []
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},
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"cache_expire": {
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"allow_null": false,
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"auto_increment": false,
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"comment": "Unix timestamp of when the cache expires",
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"decimals": null,
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"default": "",
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"length": null,
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"name": "cache_expire",
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"type": "INT",
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"unsigned": false,
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"values": []
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}
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},
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"indexes": {
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"PRIMARY": {
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"type": "primary",
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"name": "PRIMARY",
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"length": [
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null
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],
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"columns": [
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"cache_key"
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]
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},
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"cache_expire": {
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"type": "key",
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"name": "cache_expire",
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"length": [
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null
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],
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"columns": [
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"cache_expire"
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]
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}
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},
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"collation": "utf8mb4_unicode_ci",
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"engine": "InnoDB"
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}
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EOF;
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return json_decode( $schema, TRUE );
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}
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}
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