mirror of https://github.com/friendica/friendica
285 lines
9.3 KiB
PHP
285 lines
9.3 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_Custom extends Smarty_CacheResource
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{
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/**
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* fetch cached content and its modification time from data source
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*
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* @param string $id unique cache content identifier
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* @param string $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 string $content cached content
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* @param integer $mtime cache modification timestamp (epoch)
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*
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* @return void
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*/
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abstract protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime);
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/**
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* Fetch cached content's modification timestamp from data source
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* {@internal implementing this method is optional.
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* Only implement it if modification times can be accessed faster than loading the complete cached content.}}
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*
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* @param string $id unique cache content identifier
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* @param string $name template name
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* @param string $cache_id cache id
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* @param string $compile_id compile id
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*
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* @return integer|boolean timestamp (epoch) the template was modified, or false if not found
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*/
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protected function fetchTimestamp($id, $name, $cache_id, $compile_id)
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{
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return null;
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}
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/**
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* Save content to cache
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*
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* @param string $id unique cache content identifier
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* @param string $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|null $exp_time seconds till expiration or null
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* @param string $content content to cache
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*
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* @return boolean success
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*/
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abstract protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content);
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/**
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* Delete content from cache
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*
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* @param string $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|null $exp_time seconds till expiration time in seconds or null
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*
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* @return integer number of deleted caches
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*/
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abstract protected function delete($name, $cache_id, $compile_id, $exp_time);
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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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*
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* @return void
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*/
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public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template)
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{
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$_cache_id = isset($cached->cache_id) ? preg_replace('![^\w\|]+!', '_', $cached->cache_id) : null;
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$_compile_id = isset($cached->compile_id) ? preg_replace('![^\w\|]+!', '_', $cached->compile_id) : null;
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$cached->filepath = sha1($cached->source->filepath . $_cache_id . $_compile_id);
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$this->populateTimestamp($cached);
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}
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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 $cached
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*
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* @return void
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*/
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public function populateTimestamp(Smarty_Template_Cached $cached)
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{
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$mtime = $this->fetchTimestamp($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id);
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if ($mtime !== null) {
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$cached->timestamp = $mtime;
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$cached->exists = !!$cached->timestamp;
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return;
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}
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$timestamp = null;
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$this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $cached->content, $timestamp);
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$cached->timestamp = isset($timestamp) ? $timestamp : false;
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$cached->exists = !!$cached->timestamp;
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}
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/**
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* Read the cached template and process the 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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*
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* @return boolean true or false if the cached content does not exist
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*/
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public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached = null)
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{
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if (!$cached) {
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$cached = $_template->cached;
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}
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$content = $cached->content ? $cached->content : null;
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$timestamp = $cached->timestamp ? $cached->timestamp : null;
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if ($content === null || !$timestamp) {
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$this->fetch(
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$_template->cached->filepath,
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$_template->source->name,
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$_template->cache_id,
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$_template->compile_id,
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$content,
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$timestamp
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);
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}
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if (isset($content)) {
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/** @var Smarty_Internal_Template $_smarty_tpl
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* used in evaluated code
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*/
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$_smarty_tpl = $_template;
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eval("?>" . $content);
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return true;
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}
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return false;
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}
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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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*
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* @return boolean success
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*/
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public function writeCachedContent(Smarty_Internal_Template $_template, $content)
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{
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return $this->save(
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$_template->cached->filepath,
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$_template->source->name,
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$_template->cache_id,
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$_template->compile_id,
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$_template->properties['cache_lifetime'],
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$content
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);
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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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*
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* @return integer number of cache files deleted
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*/
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public function clearAll(Smarty $smarty, $exp_time = null)
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{
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$this->cache = array();
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return $this->delete(null, null, null, $exp_time);
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}
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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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*
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* @return integer number of cache files deleted
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*/
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public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time)
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{
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$this->cache = array();
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$cache_name = null;
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if (isset($resource_name)) {
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$_save_stat = $smarty->caching;
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$smarty->caching = true;
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$tpl = new $smarty->template_class($resource_name, $smarty);
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$smarty->caching = $_save_stat;
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if ($tpl->source->exists) {
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$cache_name = $tpl->source->name;
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} else {
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return 0;
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}
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// remove from template cache
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if ($smarty->allow_ambiguous_resources) {
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$_templateId = $tpl->source->unique_resource . $tpl->cache_id . $tpl->compile_id;
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} else {
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$_templateId = $smarty->joined_template_dir . '#' . $resource_name . $tpl->cache_id . $tpl->compile_id;
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}
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if (isset($_templateId[150])) {
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$_templateId = sha1($_templateId);
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}
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unset($smarty->template_objects[$_templateId]);
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// template object no longer needed
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unset($tpl);
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}
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return $this->delete($cache_name, $cache_id, $compile_id, $exp_time);
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}
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/**
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* Check is cache is locked for this template
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*
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* @param Smarty $smarty Smarty object
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* @param Smarty_Template_Cached $cached cached object
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*
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* @return boolean true or false if cache is locked
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*/
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public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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$id = $cached->filepath;
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$name = $cached->source->name . '.lock';
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$mtime = $this->fetchTimestamp($id, $name, null, null);
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if ($mtime === null) {
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$this->fetch($id, $name, null, null, $content, $mtime);
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}
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return $mtime && time() - $mtime < $smarty->locking_timeout;
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}
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/**
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* Lock cache for this template
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*
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* @param Smarty $smarty Smarty object
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* @param Smarty_Template_Cached $cached cached object
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*
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* @return bool|void
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*/
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public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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$cached->is_locked = true;
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$id = $cached->filepath;
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$name = $cached->source->name . '.lock';
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$this->save($id, $name, null, null, $smarty->locking_timeout, '');
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}
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/**
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* Unlock cache for this template
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*
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* @param Smarty $smarty Smarty object
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* @param Smarty_Template_Cached $cached cached object
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*
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* @return bool|void
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*/
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public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
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{
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$cached->is_locked = false;
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$name = $cached->source->name . '.lock';
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$this->delete($name, null, null, null);
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}
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}
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