diff options
Diffstat (limited to 'engine/lib/cache.php')
| -rw-r--r-- | engine/lib/cache.php | 452 |
1 files changed, 452 insertions, 0 deletions
diff --git a/engine/lib/cache.php b/engine/lib/cache.php new file mode 100644 index 000000000..be1c43e14 --- /dev/null +++ b/engine/lib/cache.php @@ -0,0 +1,452 @@ +<?php +/** + * Elgg cache + * Cache file interface for caching data. + * + * @package Elgg.Core + * @subpackage Cache + */ + +/* Filepath Cache */ + +/** + * Returns an ElggCache object suitable for caching system information + * + * @todo Can this be done in a cleaner way? + * @todo Swap to memcache etc? + * + * @return ElggFileCache + */ +function elgg_get_system_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 . 'system_cache/'); + } + + return $FILE_PATH_CACHE; +} + +/** + * Reset the system cache by deleting the caches + * + * @return void + */ +function elgg_reset_system_cache() { + $cache = elgg_get_system_cache(); + $cache->clear(); +} + +/** + * Saves a system cache. + * + * @param string $type The type or identifier of the cache + * @param string $data The data to be saved + * @return bool + */ +function elgg_save_system_cache($type, $data) { + global $CONFIG; + + if ($CONFIG->system_cache_enabled) { + $cache = elgg_get_system_cache(); + return $cache->save($type, $data); + } + + return false; +} + +/** + * Retrieve the contents of a system cache. + * + * @param string $type The type of cache to load + * @return string + */ +function elgg_load_system_cache($type) { + global $CONFIG; + + if ($CONFIG->system_cache_enabled) { + $cache = elgg_get_system_cache(); + $cached_data = $cache->load($type); + + if ($cached_data) { + return $cached_data; + } + } + + return NULL; +} + +/** + * Enables the system disk cache. + * + * Uses the 'system_cache_enabled' datalist with a boolean value. + * Resets the system cache. + * + * @return void + */ +function elgg_enable_system_cache() { + global $CONFIG; + + datalist_set('system_cache_enabled', 1); + $CONFIG->system_cache_enabled = 1; + elgg_reset_system_cache(); +} + +/** + * Disables the system disk cache. + * + * Uses the 'system_cache_enabled' datalist with a boolean value. + * Resets the system cache. + * + * @return void + */ +function elgg_disable_system_cache() { + global $CONFIG; + + datalist_set('system_cache_enabled', 0); + $CONFIG->system_cache_enabled = 0; + elgg_reset_system_cache(); +} + +/** @todo deprecate in Elgg 1.9 **/ + +/** + * @access private + */ +function elgg_get_filepath_cache() { + return elgg_get_system_cache(); +} +/** + * @access private + */ +function elgg_filepath_cache_reset() { + return elgg_reset_system_cache(); +} +/** + * @access private + */ +function elgg_filepath_cache_save($type, $data) { + return elgg_save_system_cache($type, $data); +} +/** + * @access private + */ +function elgg_filepath_cache_load($type) { + return elgg_load_system_cache($type); +} +/** + * @access private + */ +function elgg_enable_filepath_cache() { + return elgg_enable_system_cache(); +} +/** + * @access private + */ +function elgg_disable_filepath_cache() { + return elgg_disable_system_cache(); +} + +/* 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. + * + * @example + * $blog_js = elgg_get_simplecache_url('js', 'blog/save_draft'); + * elgg_register_simplecache_view('js/blog/save_draft'); + * elgg_register_js('elgg.blog', $blog_js); + * elgg_load_js('elgg.blog'); + * + * @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 + * + * @warning You must register the view with elgg_register_simplecache_view() + * for caching to work. See elgg_register_simplecache_view() for a full example. + * + * @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 $viewtype Optional viewtype to regenerate. Defaults to all valid viewtypes. + * + * @return void + * @see elgg_register_simplecache_view() + * @since 1.8.0 + */ +function elgg_regenerate_simplecache($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); + } + } +} + +/** + * Deletes all cached views in the simplecache and sets the lastcache and + * lastupdate time to 0 for every valid viewtype. + * + * @return bool + * @since 1.7.4 + */ +function elgg_invalidate_simplecache() { + global $CONFIG; + + if (!isset($CONFIG->views->simplecache) || !is_array($CONFIG->views->simplecache)) { + return false; + } + + $handle = opendir($CONFIG->dataroot . 'views_simplecache'); + + if (!$handle) { + return false; + } + + // remove files. + $return = true; + while (false !== ($file = readdir($handle))) { + if ($file != "." && $file != "..") { + $return &= unlink($CONFIG->dataroot . 'views_simplecache/' . $file); + } + } + closedir($handle); + + // reset cache times + $viewtypes = $CONFIG->view_types; + + if (!is_array($viewtypes)) { + return false; + } + + foreach ($viewtypes as $viewtype) { + $return &= datalist_set("simplecache_lastupdate_$viewtype", 0); + $return &= datalist_set("simplecache_lastcached_$viewtype", 0); + } + + return $return; +} + +/** + * @see elgg_reset_system_cache() + * @access private + */ +function _elgg_load_cache() { + global $CONFIG; + + $CONFIG->system_cache_loaded = false; + + $CONFIG->views = new stdClass(); + $data = elgg_load_system_cache('view_locations'); + if (!is_string($data)) { + return; + } + $CONFIG->views->locations = unserialize($data); + + $data = elgg_load_system_cache('view_types'); + if (!is_string($data)) { + return; + } + $CONFIG->view_types = unserialize($data); + + $CONFIG->system_cache_loaded = true; +} + +/** + * @access private + */ +function _elgg_cache_init() { + global $CONFIG; + + $viewtype = elgg_get_viewtype(); + + // Regenerate the simple cache if expired. + // Don't do it on upgrade because upgrade does it itself. + // @todo - move into function and perhaps run off init system event + if (!defined('UPGRADING')) { + $lastupdate = datalist_get("simplecache_lastupdate_$viewtype"); + $lastcached = datalist_get("simplecache_lastcached_$viewtype"); + if ($lastupdate == 0 || $lastcached < $lastupdate) { + elgg_regenerate_simplecache($viewtype); + $lastcached = datalist_get("simplecache_lastcached_$viewtype"); + } + $CONFIG->lastcache = $lastcached; + } + + // cache system data if enabled and not loaded + if ($CONFIG->system_cache_enabled && !$CONFIG->system_cache_loaded) { + elgg_save_system_cache('view_locations', serialize($CONFIG->views->locations)); + elgg_save_system_cache('view_types', serialize($CONFIG->view_types)); + } + + if ($CONFIG->system_cache_enabled && !$CONFIG->i18n_loaded_from_cache) { + reload_all_translations(); + foreach ($CONFIG->translations as $lang => $map) { + elgg_save_system_cache("$lang.php", serialize($map)); + } + } +} + +elgg_register_event_handler('ready', 'system', '_elgg_cache_init'); |