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