mirror of https://github.com/friendica/friendica
381 lines
11 KiB
PHP
381 lines
11 KiB
PHP
<?php
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/**
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* Smarty Internal Plugin
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*
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* @package Smarty
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* @subpackage Cacher
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*/
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/**
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* Cache Handler API
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*
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* @package Smarty
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* @subpackage Cacher
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* @author Rodney Rehm
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*/
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abstract class Smarty_CacheResource {
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/**
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* cache for Smarty_CacheResource instances
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* @var array
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*/
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public static $resources = array();
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/**
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* resource types provided by the core
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* @var array
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*/
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protected static $sysplugins = array(
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'file' => true,
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);
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/**
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* populate Cached Object with meta data from Resource
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*
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* @param Smarty_Template_Cached $cached cached object
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* @param Smarty_Internal_Template $_template template object
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* @return void
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*/
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public abstract function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template);
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/**
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* populate Cached Object with timestamp and exists from Resource
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*
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* @param Smarty_Template_Cached $source cached object
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* @return void
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*/
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public abstract function populateTimestamp(Smarty_Template_Cached $cached);
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/**
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* Read the cached template and process header
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*
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* @param Smarty_Internal_Template $_template template object
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* @param Smarty_Template_Cached $cached cached object
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* @return booelan true or false if the cached content does not exist
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*/
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public abstract function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached=null);
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/**
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* Write the rendered template output to cache
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*
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* @param Smarty_Internal_Template $_template template object
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* @param string $content content to cache
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* @return boolean success
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*/
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public abstract function writeCachedContent(Smarty_Internal_Template $_template, $content);
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/**
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* Return cached content
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*
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* @param Smarty_Internal_Template $_template template object
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* @param string $content content of cache
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*/
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public function getCachedContent(Smarty_Internal_Template $_template)
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{
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if ($_template->cached->handler->process($_template)) {
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ob_start();
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$_template->properties['unifunc']($_template);
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return ob_get_clean();
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}
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return null;
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}
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/**
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* Empty cache
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*
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* @param Smarty $smarty Smarty object
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* @param integer $exp_time expiration time (number of seconds, not timestamp)
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* @return integer number of cache files deleted
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*/
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public abstract function clearAll(Smarty $smarty, $exp_time=null);
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/**
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* Empty cache for a specific template
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*
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* @param Smarty $smarty Smarty object
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* @param string $resource_name template name
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* @param string $cache_id cache id
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* @param string $compile_id compile id
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* @param integer $exp_time expiration time (number of seconds, not timestamp)
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* @return integer number of cache files deleted
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*/
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public abstract function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time);
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public function locked(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// theoretically locking_timeout should be checked against time_limit (max_execution_time)
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$start = microtime(true);
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$hadLock = null;
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while ($this->hasLock($smarty, $cached)) {
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$hadLock = true;
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if (microtime(true) - $start > $smarty->locking_timeout) {
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// abort waiting for lock release
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return false;
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}
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sleep(1);
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}
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return $hadLock;
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}
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public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// check if lock exists
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return false;
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}
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public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// create lock
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return true;
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}
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public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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// release lock
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return true;
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}
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/**
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* Load Cache Resource Handler
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*
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* @param Smarty $smarty Smarty object
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* @param string $type name of the cache resource
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* @return Smarty_CacheResource Cache Resource Handler
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*/
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public static function load(Smarty $smarty, $type = null)
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{
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if (!isset($type)) {
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$type = $smarty->caching_type;
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}
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// try smarty's cache
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if (isset($smarty->_cacheresource_handlers[$type])) {
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return $smarty->_cacheresource_handlers[$type];
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}
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// try registered resource
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if (isset($smarty->registered_cache_resources[$type])) {
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// do not cache these instances as they may vary from instance to instance
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return $smarty->_cacheresource_handlers[$type] = $smarty->registered_cache_resources[$type];
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}
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// try sysplugins dir
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if (isset(self::$sysplugins[$type])) {
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if (!isset(self::$resources[$type])) {
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$cache_resource_class = 'Smarty_Internal_CacheResource_' . ucfirst($type);
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self::$resources[$type] = new $cache_resource_class();
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}
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return $smarty->_cacheresource_handlers[$type] = self::$resources[$type];
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}
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// try plugins dir
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$cache_resource_class = 'Smarty_CacheResource_' . ucfirst($type);
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if ($smarty->loadPlugin($cache_resource_class)) {
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if (!isset(self::$resources[$type])) {
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self::$resources[$type] = new $cache_resource_class();
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}
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return $smarty->_cacheresource_handlers[$type] = self::$resources[$type];
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}
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// give up
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throw new SmartyException("Unable to load cache resource '{$type}'");
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}
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/**
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* Invalid Loaded Cache Files
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*
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* @param Smarty $smarty Smarty object
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*/
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public static function invalidLoadedCache(Smarty $smarty)
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{
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foreach ($smarty->template_objects as $tpl) {
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if (isset($tpl->cached)) {
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$tpl->cached->valid = false;
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$tpl->cached->processed = false;
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}
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}
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}
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}
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/**
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* Smarty Resource Data Object
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*
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* Cache Data Container for Template Files
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*
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* @package Smarty
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* @subpackage TemplateResources
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* @author Rodney Rehm
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*/
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class Smarty_Template_Cached {
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/**
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* Source Filepath
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* @var string
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*/
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public $filepath = false;
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/**
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* Source Content
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* @var string
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*/
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public $content = null;
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/**
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* Source Timestamp
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* @var integer
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*/
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public $timestamp = false;
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/**
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* Source Existance
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* @var boolean
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*/
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public $exists = false;
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/**
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* Cache Is Valid
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* @var boolean
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*/
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public $valid = false;
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/**
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* Cache was processed
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* @var boolean
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*/
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public $processed = false;
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/**
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* CacheResource Handler
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* @var Smarty_CacheResource
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*/
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public $handler = null;
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/**
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* Template Compile Id (Smarty_Internal_Template::$compile_id)
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* @var string
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*/
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public $compile_id = null;
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/**
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* Template Cache Id (Smarty_Internal_Template::$cache_id)
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* @var string
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*/
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public $cache_id = null;
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/**
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* Id for cache locking
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* @var string
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*/
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public $lock_id = null;
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/**
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* flag that cache is locked by this instance
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* @var bool
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*/
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public $is_locked = false;
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/**
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* Source Object
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* @var Smarty_Template_Source
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*/
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public $source = null;
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/**
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* create Cached Object container
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*
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* @param Smarty_Internal_Template $_template template object
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*/
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public function __construct(Smarty_Internal_Template $_template)
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{
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$this->compile_id = $_template->compile_id;
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$this->cache_id = $_template->cache_id;
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$this->source = $_template->source;
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$_template->cached = $this;
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$smarty = $_template->smarty;
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//
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// load resource handler
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//
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$this->handler = $handler = Smarty_CacheResource::load($smarty); // Note: prone to circular references
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//
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// check if cache is valid
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//
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if (!($_template->caching == Smarty::CACHING_LIFETIME_CURRENT || $_template->caching == Smarty::CACHING_LIFETIME_SAVED) || $_template->source->recompiled) {
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$handler->populate($this, $_template);
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return;
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}
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while (true) {
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while (true) {
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$handler->populate($this, $_template);
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if ($this->timestamp === false || $smarty->force_compile || $smarty->force_cache) {
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$this->valid = false;
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} else {
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$this->valid = true;
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}
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if ($this->valid && $_template->caching == Smarty::CACHING_LIFETIME_CURRENT && $_template->cache_lifetime >= 0 && time() > ($this->timestamp + $_template->cache_lifetime)) {
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// lifetime expired
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$this->valid = false;
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}
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if ($this->valid || !$_template->smarty->cache_locking) {
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break;
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}
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if (!$this->handler->locked($_template->smarty, $this)) {
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$this->handler->acquireLock($_template->smarty, $this);
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break 2;
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}
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}
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if ($this->valid) {
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if (!$_template->smarty->cache_locking || $this->handler->locked($_template->smarty, $this) === null) {
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// load cache file for the following checks
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if ($smarty->debugging) {
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Smarty_Internal_Debug::start_cache($_template);
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}
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if($handler->process($_template, $this) === false) {
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$this->valid = false;
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} else {
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$this->processed = true;
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}
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if ($smarty->debugging) {
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Smarty_Internal_Debug::end_cache($_template);
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}
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} else {
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continue;
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}
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} else {
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return;
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}
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if ($this->valid && $_template->caching === Smarty::CACHING_LIFETIME_SAVED && $_template->properties['cache_lifetime'] >= 0 && (time() > ($_template->cached->timestamp + $_template->properties['cache_lifetime']))) {
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$this->valid = false;
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}
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if (!$this->valid && $_template->smarty->cache_locking) {
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$this->handler->acquireLock($_template->smarty, $this);
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return;
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} else {
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return;
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}
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}
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}
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/**
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* Write this cache object to handler
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*
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* @param Smarty_Internal_Template $_template template object
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* @param string $content content to cache
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* @return boolean success
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*/
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public function write(Smarty_Internal_Template $_template, $content)
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{
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if (!$_template->source->recompiled) {
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if ($this->handler->writeCachedContent($_template, $content)) {
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$this->timestamp = time();
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$this->exists = true;
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$this->valid = true;
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if ($_template->smarty->cache_locking) {
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$this->handler->releaseLock($_template->smarty, $this);
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}
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return true;
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}
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}
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return false;
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}
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}
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?>
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