diff options
Diffstat (limited to 'include/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php')
| -rw-r--r-- | include/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/include/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php b/include/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php new file mode 100644 index 000000000..dff9b65aa --- /dev/null +++ b/include/smarty/libs/sysplugins/smarty_cacheresource_keyvaluestore.php @@ -0,0 +1,463 @@ +<?php +/** + * Smarty Internal Plugin + * + * @package Smarty + * @subpackage Cacher + */ + +/** + * Smarty Cache Handler Base for Key/Value Storage Implementations + * + * This class implements the functionality required to use simple key/value stores + * for hierarchical cache groups. key/value stores like memcache or APC do not support + * wildcards in keys, therefore a cache group cannot be cleared like "a|*" - which + * is no problem to filesystem and RDBMS implementations. + * + * This implementation is based on the concept of invalidation. While one specific cache + * can be identified and cleared, any range of caches cannot be identified. For this reason + * each level of the cache group hierarchy can have its own value in the store. These values + * are nothing but microtimes, telling us when a particular cache group was cleared for the + * last time. These keys are evaluated for every cache read to determine if the cache has + * been invalidated since it was created and should hence be treated as inexistent. + * + * Although deep hierarchies are possible, they are not recommended. Try to keep your + * cache groups as shallow as possible. Anything up 3-5 parents should be ok. So + * »a|b|c« is a good depth where »a|b|c|d|e|f|g|h|i|j|k« isn't. Try to join correlating + * cache groups: if your cache groups look somewhat like »a|b|$page|$items|$whatever« + * consider using »a|b|c|$page-$items-$whatever« instead. + * + * @package Smarty + * @subpackage Cacher + * @author Rodney Rehm + */ +abstract class Smarty_CacheResource_KeyValueStore extends Smarty_CacheResource { + + /** + * cache for contents + * @var array + */ + protected $contents = array(); + /** + * cache for timestamps + * @var array + */ + protected $timestamps = array(); + + /** + * populate Cached Object with meta data from Resource + * + * @param Smarty_Template_Cached $cached cached object + * @param Smarty_Internal_Template $_template template object + * @return void + */ + public function populate(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template) + { + $cached->filepath = $_template->source->uid + . '#' . $this->sanitize($cached->source->name) + . '#' . $this->sanitize($cached->cache_id) + . '#' . $this->sanitize($cached->compile_id); + + $this->populateTimestamp($cached); + } + + /** + * populate Cached Object with timestamp and exists from Resource + * + * @param Smarty_Template_Cached $cached cached object + * @return void + */ + public function populateTimestamp(Smarty_Template_Cached $cached) + { + if (!$this->fetch($cached->filepath, $cached->source->name, $cached->cache_id, $cached->compile_id, $content, $timestamp, $cached->source->uid)) { + return; + } + $cached->content = $content; + $cached->timestamp = (int) $timestamp; + $cached->exists = $cached->timestamp; + } + + /** + * Read the cached template and process the header + * + * @param Smarty_Internal_Template $_template template object + * @param Smarty_Template_Cached $cached cached object + * @return booelan true or false if the cached content does not exist + */ + public function process(Smarty_Internal_Template $_template, Smarty_Template_Cached $cached=null) + { + if (!$cached) { + $cached = $_template->cached; + } + $content = $cached->content ? $cached->content : null; + $timestamp = $cached->timestamp ? $cached->timestamp : null; + if ($content === null || !$timestamp) { + if (!$this->fetch($_template->cached->filepath, $_template->source->name, $_template->cache_id, $_template->compile_id, $content, $timestamp, $_template->source->uid)) { + return false; + } + } + if (isset($content)) { + $_smarty_tpl = $_template; + eval("?>" . $content); + return true; + } + return false; + } + + /** + * Write the rendered template output to cache + * + * @param Smarty_Internal_Template $_template template object + * @param string $content content to cache + * @return boolean success + */ + public function writeCachedContent(Smarty_Internal_Template $_template, $content) + { + $this->addMetaTimestamp($content); + return $this->write(array($_template->cached->filepath => $content), $_template->properties['cache_lifetime']); + } + + /** + * Empty cache + * + * {@internal the $exp_time argument is ignored altogether }} + * + * @param Smarty $smarty Smarty object + * @param integer $exp_time expiration time [being ignored] + * @return integer number of cache files deleted [always -1] + * @uses purge() to clear the whole store + * @uses invalidate() to mark everything outdated if purge() is inapplicable + */ + public function clearAll(Smarty $smarty, $exp_time=null) + { + if (!$this->purge()) { + $this->invalidate(null); + } + return -1; + } + + /** + * Empty cache for a specific template + * + * {@internal the $exp_time argument is ignored altogether}} + * + * @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 [being ignored] + * @return integer number of cache files deleted [always -1] + * @uses buildCachedFilepath() to generate the CacheID + * @uses invalidate() to mark CacheIDs parent chain as outdated + * @uses delete() to remove CacheID from cache + */ + public function clear(Smarty $smarty, $resource_name, $cache_id, $compile_id, $exp_time) + { + $uid = $this->getTemplateUid($smarty, $resource_name, $cache_id, $compile_id); + $cid = $uid . '#' . $this->sanitize($resource_name) . '#' . $this->sanitize($cache_id) . '#' . $this->sanitize($compile_id); + $this->delete(array($cid)); + $this->invalidate($cid, $resource_name, $cache_id, $compile_id, $uid); + return -1; + } + /** + * Get template's unique ID + * + * @param Smarty $smarty Smarty object + * @param string $resource_name template name + * @param string $cache_id cache id + * @param string $compile_id compile id + * @return string filepath of cache file + */ + protected function getTemplateUid(Smarty $smarty, $resource_name, $cache_id, $compile_id) + { + $uid = ''; + if (isset($resource_name)) { + $tpl = new $smarty->template_class($resource_name, $smarty); + if ($tpl->source->exists) { + $uid = $tpl->source->uid; + } + + // remove from template cache + if ($smarty->allow_ambiguous_resources) { + $_templateId = $tpl->source->unique_resource . $tpl->cache_id . $tpl->compile_id; + } else { + $_templateId = $smarty->joined_template_dir . '#' . $resource_name . $tpl->cache_id . $tpl->compile_id; + } + if (isset($_templateId[150])) { + $_templateId = sha1($_templateId); + } + unset($smarty->template_objects[$_templateId]); + } + return $uid; + } + + /** + * Sanitize CacheID components + * + * @param string $string CacheID component to sanitize + * @return string sanitized CacheID component + */ + protected function sanitize($string) + { + // some poeple smoke bad weed + $string = trim($string, '|'); + if (!$string) { + return null; + } + return preg_replace('#[^\w\|]+#S', '_', $string); + } + + /** + * Fetch and prepare a cache object. + * + * @param string $cid CacheID to fetch + * @param string $resource_name template name + * @param string $cache_id cache id + * @param string $compile_id compile id + * @param string $content cached content + * @param integer &$timestamp cached timestamp (epoch) + * @param string $resource_uid resource's uid + * @return boolean success + */ + protected function fetch($cid, $resource_name = null, $cache_id = null, $compile_id = null, &$content = null, &$timestamp = null, $resource_uid = null) + { + $t = $this->read(array($cid)); + $content = !empty($t[$cid]) ? $t[$cid] : null; + $timestamp = null; + + if ($content && ($timestamp = $this->getMetaTimestamp($content))) { + $invalidated = $this->getLatestInvalidationTimestamp($cid, $resource_name, $cache_id, $compile_id, $resource_uid); + if ($invalidated > $timestamp) { + $timestamp = null; + $content = null; + } + } + + return !!$content; + } + + /** + * Add current microtime to the beginning of $cache_content + * + * {@internal the header uses 8 Bytes, the first 4 Bytes are the seconds, the second 4 Bytes are the microseconds}} + * + * @param string &$content the content to be cached + */ + protected function addMetaTimestamp(&$content) + { + $mt = explode(" ", microtime()); + $ts = pack("NN", $mt[1], (int) ($mt[0] * 100000000)); + $content = $ts . $content; + } + + /** + * Extract the timestamp the $content was cached + * + * @param string &$content the cached content + * @return float the microtime the content was cached + */ + protected function getMetaTimestamp(&$content) + { + $s = unpack("N", substr($content, 0, 4)); + $m = unpack("N", substr($content, 4, 4)); + $content = substr($content, 8); + return $s[1] + ($m[1] / 100000000); + } + + /** + * Invalidate CacheID + * + * @param string $cid CacheID + * @param string $resource_name template name + * @param string $cache_id cache id + * @param string $compile_id compile id + * @param string $resource_uid source's uid + * @return void + */ + protected function invalidate($cid = null, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) + { + $now = microtime(true); + $key = null; + // invalidate everything + if (!$resource_name && !$cache_id && !$compile_id) { + $key = 'IVK#ALL'; + } + // invalidate all caches by template + else if ($resource_name && !$cache_id && !$compile_id) { + $key = 'IVK#TEMPLATE#' . $resource_uid . '#' . $this->sanitize($resource_name); + } + // invalidate all caches by cache group + else if (!$resource_name && $cache_id && !$compile_id) { + $key = 'IVK#CACHE#' . $this->sanitize($cache_id); + } + // invalidate all caches by compile id + else if (!$resource_name && !$cache_id && $compile_id) { + $key = 'IVK#COMPILE#' . $this->sanitize($compile_id); + } + // invalidate by combination + else { + $key = 'IVK#CID#' . $cid; + } + $this->write(array($key => $now)); + } + + /** + * Determine the latest timestamp known to the invalidation chain + * + * @param string $cid CacheID to determine latest invalidation timestamp of + * @param string $resource_name template name + * @param string $cache_id cache id + * @param string $compile_id compile id + * @param string $resource_uid source's filepath + * @return float the microtime the CacheID was invalidated + */ + protected function getLatestInvalidationTimestamp($cid, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) + { + // abort if there is no CacheID + if (false && !$cid) { + return 0; + } + // abort if there are no InvalidationKeys to check + if (!($_cid = $this->listInvalidationKeys($cid, $resource_name, $cache_id, $compile_id, $resource_uid))) { + return 0; + } + + // there are no InValidationKeys + if (!($values = $this->read($_cid))) { + return 0; + } + // make sure we're dealing with floats + $values = array_map('floatval', $values); + return max($values); + } + + /** + * Translate a CacheID into the list of applicable InvalidationKeys. + * + * Splits "some|chain|into|an|array" into array( '#clearAll#', 'some', 'some|chain', 'some|chain|into', ... ) + * + * @param string $cid CacheID to translate + * @param string $resource_name template name + * @param string $cache_id cache id + * @param string $compile_id compile id + * @param string $resource_uid source's filepath + * @return array list of InvalidationKeys + * @uses $invalidationKeyPrefix to prepend to each InvalidationKey + */ + protected function listInvalidationKeys($cid, $resource_name = null, $cache_id = null, $compile_id = null, $resource_uid = null) + { + $t = array('IVK#ALL'); + $_name = $_compile = '#'; + if ($resource_name) { + $_name .= $resource_uid . '#' . $this->sanitize($resource_name); + $t[] = 'IVK#TEMPLATE' . $_name; + } + if ($compile_id) { + $_compile .= $this->sanitize($compile_id); + $t[] = 'IVK#COMPILE' . $_compile; + } + $_name .= '#'; + // some poeple smoke bad weed + $cid = trim($cache_id, '|'); + if (!$cid) { + return $t; + } + $i = 0; + while (true) { + // determine next delimiter position + $i = strpos($cid, '|', $i); + // add complete CacheID if there are no more delimiters + if ($i === false) { + $t[] = 'IVK#CACHE#' . $cid; + $t[] = 'IVK#CID' . $_name . $cid . $_compile; + $t[] = 'IVK#CID' . $_name . $_compile; + break; + } + $part = substr($cid, 0, $i); + // add slice to list + $t[] = 'IVK#CACHE#' . $part; + $t[] = 'IVK#CID' . $_name . $part . $_compile; + // skip past delimiter position + $i++; + } + return $t; + } + + /** + * Check is cache is locked for this template + * + * @param Smarty $smarty Smarty object + * @param Smarty_Template_Cached $cached cached object + * @return booelan true or false if cache is locked + */ + public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached) + { + $key = 'LOCK#' . $cached->filepath; + $data = $this->read(array($key)); + return $data && time() - $data[$key] < $smarty->locking_timeout; + } + + /** + * Lock cache for this template + * + * @param Smarty $smarty Smarty object + * @param Smarty_Template_Cached $cached cached object + */ + public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached) + { + $cached->is_locked = true; + $key = 'LOCK#' . $cached->filepath; + $this->write(array($key => time()), $smarty->locking_timeout); + } + + /** + * Unlock cache for this template + * + * @param Smarty $smarty Smarty object + * @param Smarty_Template_Cached $cached cached object + */ + public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached) + { + $cached->is_locked = false; + $key = 'LOCK#' . $cached->filepath; + $this->delete(array($key)); + } + + /** + * Read values for a set of keys from cache + * + * @param array $keys list of keys to fetch + * @return array list of values with the given keys used as indexes + */ + protected abstract function read(array $keys); + + /** + * Save values for a set of keys to cache + * + * @param array $keys list of values to save + * @param int $expire expiration time + * @return boolean true on success, false on failure + */ + protected abstract function write(array $keys, $expire=null); + + /** + * Remove values from cache + * + * @param array $keys list of keys to delete + * @return boolean true on success, false on failure + */ + protected abstract function delete(array $keys); + + /** + * Remove *all* values from cache + * + * @return boolean true on success, false on failure + */ + protected function purge() + { + return false; + } + +} + +?>
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