<?php /** * Elgg cache * Cache file interface for caching data. * * @package Elgg.Core * @subpackage Cache */ /* Filepath Cache */ /** * Returns an ElggCache object suitable for caching view * file load paths to disk under $CONFIG->dataroot. * * @todo Can this be done in a cleaner way? * @todo Swap to memcache etc? * * @return ElggFileCache A cache object suitable for caching file load paths. */ function elgg_get_filepath_cache() { global $CONFIG; /** * A default filestore cache using the dataroot. */ static $FILE_PATH_CACHE; if (!$FILE_PATH_CACHE) { $FILE_PATH_CACHE = new ElggFileCache($CONFIG->dataroot); } return $FILE_PATH_CACHE; } /** * Function which resets the file path cache. * */ function elgg_filepath_cache_reset() { $cache = elgg_get_filepath_cache(); $view_types_result = $cache->delete('view_types'); $views_result = $cache->delete('views'); return $view_types_result && $views_result; } /** * Saves a filepath cache. * * @param string $type * @param string $data * @return bool */ function elgg_filepath_cache_save($type, $data) { global $CONFIG; if ($CONFIG->viewpath_cache_enabled) { $cache = elgg_get_filepath_cache(); return $cache->save($type, $data); } return false; } /** * Retrieve the contents of the filepath cache. * * @param string $type The type of cache to load * @return string */ function elgg_filepath_cache_load($type) { global $CONFIG; if ($CONFIG->viewpath_cache_enabled) { $cache = elgg_get_filepath_cache(); $cached_data = $cache->load($type); if ($cached_data) { return $cached_data; } } return NULL; } /** * Enables the views file paths disk cache. * * Uses the 'viewpath_cache_enabled' datalist with a boolean value. * Resets the views paths cache. * * @return null */ function elgg_enable_filepath_cache() { global $CONFIG; datalist_set('viewpath_cache_enabled', 1); $CONFIG->viewpath_cache_enabled = 1; elgg_filepath_cache_reset(); } /** * Disables the views file paths disk cache. * * Uses the 'viewpath_cache_enabled' datalist with a boolean value. * Resets the views paths cache. * * @return null */ function elgg_disable_filepath_cache() { global $CONFIG; datalist_set('viewpath_cache_enabled', 0); $CONFIG->viewpath_cache_enabled = 0; elgg_filepath_cache_reset(); } /* Simplecache */ /** * Registers a view to simple cache. * * Simple cache is a caching mechanism that saves the output of * views and its extensions into a file. If the view is called * by the {@link simplecache/view.php} file, the Elgg framework will * not be loaded and the contents of the view will returned * from file. * * @warning Simple cached views must take no parameters and return * the same content no matter who is logged in. * * @note CSS and the basic JS views are cached by the engine. * * @param string $viewname View name * * @return void * @link http://docs.elgg.org/Views/Simplecache * @see elgg_regenerate_simplecache() * @since 1.8.0 */ function elgg_register_simplecache_view($viewname) { global $CONFIG; if (!isset($CONFIG->views)) { $CONFIG->views = new stdClass; } if (!isset($CONFIG->views->simplecache)) { $CONFIG->views->simplecache = array(); } $CONFIG->views->simplecache[] = $viewname; } /** * Get the URL for the cached file * * @param string $type The file type: css or js * @param string $view The view name * @return string * @since 1.8.0 */ function elgg_get_simplecache_url($type, $view) { global $CONFIG; $lastcache = (int)$CONFIG->lastcache; $viewtype = elgg_get_viewtype(); if (elgg_is_simplecache_enabled()) { $url = elgg_get_site_url() . "cache/$type/$viewtype/$view.$lastcache.$type"; } else { $url = elgg_get_site_url() . "$type/$view.$lastcache.$type"; $elements = array("view" => $viewtype); $url = elgg_http_add_url_query_elements($url, $elements); } return $url; } /** * Regenerates the simple cache. * * @warning This does not invalidate the cache, but actively resets it. * * @param string $viewtype Optional viewtype to regenerate * * @return void * @see elgg_register_simplecache_view() * @since 1.8.0 */ function elgg_regenerate_simplecache($viewtype = NULL) { global $CONFIG; if (!isset($CONFIG->views->simplecache) || !is_array($CONFIG->views->simplecache)) { return; } $lastcached = time(); // @todo elgg_view() checks if the page set is done (isset($CONFIG->pagesetupdone)) and // triggers an event if it's not. Calling elgg_view() here breaks submenus // (at least) because the page setup hook is called before any // contexts can be correctly set (since this is called before page_handler()). // To avoid this, lie about $CONFIG->pagehandlerdone to force // the trigger correctly when the first view is actually being output. $CONFIG->pagesetupdone = TRUE; if (!file_exists($CONFIG->dataroot . 'views_simplecache')) { mkdir($CONFIG->dataroot . 'views_simplecache'); } if (isset($viewtype)) { $viewtypes = array($viewtype); } else { $viewtypes = $CONFIG->view_types; } $original_viewtype = elgg_get_viewtype(); // disable error reporting so we don't cache problems $old_debug = elgg_get_config('debug'); elgg_set_config('debug', null); foreach ($viewtypes as $viewtype) { elgg_set_viewtype($viewtype); foreach ($CONFIG->views->simplecache as $view) { $viewcontents = elgg_view($view); $viewname = md5(elgg_get_viewtype() . $view); if ($handle = fopen($CONFIG->dataroot . 'views_simplecache/' . $viewname, 'w')) { fwrite($handle, $viewcontents); fclose($handle); } } datalist_set("simplecache_lastupdate_$viewtype", $lastcached); datalist_set("simplecache_lastcached_$viewtype", $lastcached); } elgg_set_config('debug', $old_debug); elgg_set_viewtype($original_viewtype); // needs to be set for links in html head $CONFIG->lastcache = $lastcached; unset($CONFIG->pagesetupdone); } /** * Is simple cache enabled * * @return bool * @since 1.8.0 */ function elgg_is_simplecache_enabled() { if (elgg_get_config('simplecache_enabled')) { return true; } return false; } /** * Enables the simple cache. * * @access private * @see elgg_register_simplecache_view() * @return void * @since 1.8.0 */ function elgg_enable_simplecache() { global $CONFIG; datalist_set('simplecache_enabled', 1); $CONFIG->simplecache_enabled = 1; elgg_regenerate_simplecache(); } /** * Disables the simple cache. * * @warning Simplecache is also purged when disabled. * * @access private * @see elgg_register_simplecache_view() * @return void * @since 1.8.0 */ function elgg_disable_simplecache() { global $CONFIG; if ($CONFIG->simplecache_enabled) { datalist_set('simplecache_enabled', 0); $CONFIG->simplecache_enabled = 0; // purge simple cache if ($handle = opendir($CONFIG->dataroot . 'views_simplecache')) { while (false !== ($file = readdir($handle))) { if ($file != "." && $file != "..") { unlink($CONFIG->dataroot . 'views_simplecache/' . $file); } } closedir($handle); } } } /** * Invalidates all cached views in the simplecache * * @return bool * @since 1.7.4 */ function elgg_invalidate_simplecache() { global $CONFIG; $return = TRUE; if ($handle = opendir($CONFIG->dataroot . 'views_simplecache')) { while (false !== ($file = readdir($handle))) { if ($file != "." && $file != "..") { $return = $return && unlink($CONFIG->dataroot . 'views_simplecache/' . $file); } } closedir($handle); } else { $return = FALSE; } return $return; }