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125fb332de
Summary: Ref T11954. I want to store some lists/arrays in the mutable (database) cache, but it only supports string storage. Provide a serializing wrapper which flattens when values are written and expands them when they're read. Test Plan: Used by D16997. See that revision. Reviewers: chad Reviewed By: chad Maniphest Tasks: T11954 Differential Revision: https://secure.phabricator.com/D16999
465 lines
12 KiB
PHP
465 lines
12 KiB
PHP
<?php
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/**
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*
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* @task request Request Cache
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* @task immutable Immutable Cache
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* @task setup Setup Cache
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* @task compress Compression
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*/
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final class PhabricatorCaches extends Phobject {
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private static $requestCache;
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public static function getNamespace() {
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return PhabricatorEnv::getEnvConfig('phabricator.cache-namespace');
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}
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private static function newStackFromCaches(array $caches) {
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$caches = self::addNamespaceToCaches($caches);
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$caches = self::addProfilerToCaches($caches);
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return id(new PhutilKeyValueCacheStack())
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->setCaches($caches);
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}
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/* -( Request Cache )------------------------------------------------------ */
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/**
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* Get a request cache stack.
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*
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* This cache stack is destroyed after each logical request. In particular,
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* it is destroyed periodically by the daemons, while `static` caches are
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* not.
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*
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* @return PhutilKeyValueCacheStack Request cache stack.
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*/
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public static function getRequestCache() {
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if (!self::$requestCache) {
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self::$requestCache = new PhutilInRequestKeyValueCache();
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}
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return self::$requestCache;
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}
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/**
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* Destroy the request cache.
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*
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* This is called at the beginning of each logical request.
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*
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* @return void
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*/
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public static function destroyRequestCache() {
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self::$requestCache = null;
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}
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/* -( Immutable Cache )---------------------------------------------------- */
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/**
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* Gets an immutable cache stack.
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*
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* This stack trades mutability away for improved performance. Normally, it is
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* APC + DB.
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*
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* In the general case with multiple web frontends, this stack can not be
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* cleared, so it is only appropriate for use if the value of a given key is
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* permanent and immutable.
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*
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* @return PhutilKeyValueCacheStack Best immutable stack available.
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* @task immutable
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*/
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public static function getImmutableCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildImmutableCaches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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/**
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* Build the immutable cache stack.
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*
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* @return list<PhutilKeyValueCache> List of caches.
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* @task immutable
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*/
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private static function buildImmutableCaches() {
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$caches = array();
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$apc = new PhutilAPCKeyValueCache();
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if ($apc->isAvailable()) {
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$caches[] = $apc;
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}
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$caches[] = new PhabricatorKeyValueDatabaseCache();
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return $caches;
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}
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public static function getMutableCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildMutableCaches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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private static function buildMutableCaches() {
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$caches = array();
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$caches[] = new PhabricatorKeyValueDatabaseCache();
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return $caches;
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}
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public static function getMutableStructureCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildMutableStructureCaches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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private static function buildMutableStructureCaches() {
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$caches = array();
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$cache = new PhabricatorKeyValueDatabaseCache();
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$cache = new PhabricatorKeyValueSerializingCacheProxy($cache);
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$caches[] = $cache;
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return $caches;
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}
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/* -( Runtime Cache )------------------------------------------------------ */
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/**
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* Get a runtime cache stack.
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*
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* This stack is just APC. It's fast, it's effectively immutable, and it
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* gets thrown away when the webserver restarts.
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*
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* This cache is suitable for deriving runtime caches, like a map of Conduit
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* method names to provider classes.
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*
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* @return PhutilKeyValueCacheStack Best runtime stack available.
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*/
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public static function getRuntimeCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildRuntimeCaches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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private static function buildRuntimeCaches() {
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$caches = array();
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$apc = new PhutilAPCKeyValueCache();
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if ($apc->isAvailable()) {
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$caches[] = $apc;
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}
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return $caches;
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}
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/* -( Repository Graph Cache )--------------------------------------------- */
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public static function getRepositoryGraphL1Cache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildRepositoryGraphL1Caches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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private static function buildRepositoryGraphL1Caches() {
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$caches = array();
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$request = new PhutilInRequestKeyValueCache();
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$request->setLimit(32);
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$caches[] = $request;
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$apc = new PhutilAPCKeyValueCache();
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if ($apc->isAvailable()) {
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$caches[] = $apc;
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}
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return $caches;
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}
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public static function getRepositoryGraphL2Cache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildRepositoryGraphL2Caches();
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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private static function buildRepositoryGraphL2Caches() {
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$caches = array();
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$caches[] = new PhabricatorKeyValueDatabaseCache();
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return $caches;
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}
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/* -( Server State Cache )------------------------------------------------- */
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/**
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* Highly specialized cache for storing server process state.
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*
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* We use this cache to track initial steps in the setup phase, before
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* configuration is loaded.
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*
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* This cache does NOT use the cache namespace (it must be accessed before
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* we build configuration), and is global across all instances on the host.
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*
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* @return PhutilKeyValueCacheStack Best available server state cache stack.
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* @task setup
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*/
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public static function getServerStateCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildSetupCaches('phabricator-server');
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// NOTE: We are NOT adding a cache namespace here! This cache is shared
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// across all instances on the host.
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$caches = self::addProfilerToCaches($caches);
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$cache = id(new PhutilKeyValueCacheStack())
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->setCaches($caches);
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}
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return $cache;
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}
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/* -( Setup Cache )-------------------------------------------------------- */
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/**
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* Highly specialized cache for performing setup checks. We use this cache
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* to determine if we need to run expensive setup checks when the page
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* loads. Without it, we would need to run these checks every time.
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*
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* Normally, this cache is just APC. In the absence of APC, this cache
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* degrades into a slow, quirky on-disk cache.
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*
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* NOTE: Do not use this cache for anything else! It is not a general-purpose
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* cache!
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*
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* @return PhutilKeyValueCacheStack Most qualified available cache stack.
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* @task setup
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*/
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public static function getSetupCache() {
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static $cache;
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if (!$cache) {
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$caches = self::buildSetupCaches('phabricator-setup');
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$cache = self::newStackFromCaches($caches);
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}
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return $cache;
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}
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/**
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* @task setup
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*/
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private static function buildSetupCaches($cache_name) {
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// If this is the CLI, just build a setup cache.
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if (php_sapi_name() == 'cli') {
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return array();
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}
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// In most cases, we should have APC. This is an ideal cache for our
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// purposes -- it's fast and empties on server restart.
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$apc = new PhutilAPCKeyValueCache();
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if ($apc->isAvailable()) {
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return array($apc);
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}
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// If we don't have APC, build a poor approximation on disk. This is still
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// much better than nothing; some setup steps are quite slow.
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$disk_path = self::getSetupCacheDiskCachePath($cache_name);
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if ($disk_path) {
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$disk = new PhutilOnDiskKeyValueCache();
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$disk->setCacheFile($disk_path);
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$disk->setWait(0.1);
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if ($disk->isAvailable()) {
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return array($disk);
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}
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}
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return array();
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}
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/**
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* @task setup
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*/
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private static function getSetupCacheDiskCachePath($name) {
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// The difficulty here is in choosing a path which will change on server
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// restart (we MUST have this property), but as rarely as possible
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// otherwise (we desire this property to give the cache the best hit rate
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// we can).
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// Unfortunately, we don't have a very good strategy for minimizing the
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// churn rate of the cache. We previously tried to use the parent process
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// PID in some cases, but this was not reliable. See T9599 for one case of
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// this.
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$pid_basis = getmypid();
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// If possible, we also want to know when the process launched, so we can
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// drop the cache if a process restarts but gets the same PID an earlier
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// process had. "/proc" is not available everywhere (e.g., not on OSX), but
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// check if we have it.
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$epoch_basis = null;
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$stat = @stat("/proc/{$pid_basis}");
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if ($stat !== false) {
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$epoch_basis = $stat['ctime'];
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}
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$tmp_dir = sys_get_temp_dir();
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$tmp_path = $tmp_dir.DIRECTORY_SEPARATOR.$name;
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if (!file_exists($tmp_path)) {
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@mkdir($tmp_path);
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}
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$is_ok = self::testTemporaryDirectory($tmp_path);
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if (!$is_ok) {
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$tmp_path = $tmp_dir;
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$is_ok = self::testTemporaryDirectory($tmp_path);
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if (!$is_ok) {
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// We can't find anywhere to write the cache, so just bail.
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return null;
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}
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}
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$tmp_name = 'setup-'.$pid_basis;
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if ($epoch_basis) {
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$tmp_name .= '.'.$epoch_basis;
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}
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$tmp_name .= '.cache';
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return $tmp_path.DIRECTORY_SEPARATOR.$tmp_name;
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}
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/**
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* @task setup
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*/
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private static function testTemporaryDirectory($dir) {
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if (!@file_exists($dir)) {
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return false;
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}
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if (!@is_dir($dir)) {
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return false;
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}
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if (!@is_writable($dir)) {
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return false;
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}
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return true;
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}
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private static function addProfilerToCaches(array $caches) {
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foreach ($caches as $key => $cache) {
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$pcache = new PhutilKeyValueCacheProfiler($cache);
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$pcache->setProfiler(PhutilServiceProfiler::getInstance());
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$caches[$key] = $pcache;
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}
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return $caches;
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}
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private static function addNamespaceToCaches(array $caches) {
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$namespace = self::getNamespace();
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if (!$namespace) {
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return $caches;
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}
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foreach ($caches as $key => $cache) {
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$ncache = new PhutilKeyValueCacheNamespace($cache);
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$ncache->setNamespace($namespace);
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$caches[$key] = $ncache;
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}
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return $caches;
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}
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/**
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* Deflate a value, if deflation is available and has an impact.
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*
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* If the value is larger than 1KB, we have `gzdeflate()`, we successfully
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* can deflate it, and it benefits from deflation, we deflate it. Otherwise
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* we leave it as-is.
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*
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* Data can later be inflated with @{method:inflateData}.
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*
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* @param string String to attempt to deflate.
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* @return string|null Deflated string, or null if it was not deflated.
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* @task compress
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*/
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public static function maybeDeflateData($value) {
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$len = strlen($value);
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if ($len <= 1024) {
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return null;
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}
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if (!function_exists('gzdeflate')) {
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return null;
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}
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$deflated = gzdeflate($value);
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if ($deflated === false) {
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return null;
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}
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$deflated_len = strlen($deflated);
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if ($deflated_len >= ($len / 2)) {
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return null;
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}
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return $deflated;
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}
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/**
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* Inflate data previously deflated by @{method:maybeDeflateData}.
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*
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* @param string Deflated data, from @{method:maybeDeflateData}.
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* @return string Original, uncompressed data.
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* @task compress
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*/
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public static function inflateData($value) {
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if (!function_exists('gzinflate')) {
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throw new Exception(
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pht(
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'%s is not available; unable to read deflated data!',
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'gzinflate()'));
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}
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$value = gzinflate($value);
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if ($value === false) {
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throw new Exception(pht('Failed to inflate data!'));
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}
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return $value;
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}
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}
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