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https://github.com/EGroupware/egroupware.git
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901 lines
30 KiB
PHP
901 lines
30 KiB
PHP
<?php
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/**
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* EGroupware API: Caching data
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage cache
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2009-16 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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namespace EGroupware\Api;
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/**
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* Class to manage caching in eGroupware.
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*
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* It allows to cache on 4 levels:
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* a) tree: for all instances/domains runining on a certain source path
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* b) instance: for all sessions on a given instance
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* c) session: for all requests of a session, same as deprecated egw_session::appsession()
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* d) request: just for this request (same as using a static variable)
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*
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* There's a get, a set and a unset method for each level: eg. getTree() or setInstance(),
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* as well as a variant allowing to specify the level as first parameter: eg. unsetCache()
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*
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* getXXX($app,$location,$callback=null,array $callback_params,$expiration=0)
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* has three optional parameters allowing to specify:
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* 3. a callback if requested data is not yes stored. In that case the callback is called
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* and it's value is stored in the cache AND returned
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* 4. parameters to pass to the callback as array, see call_user_func_array
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* 5. an expiration time in seconds to specify how long data should be cached,
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* default 0 means infinite (this time is not supported for request level!)
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*
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* Data is stored under an application name and a location, like egw_session::appsession().
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* In fact data stored at cache level Api\Cache::SESSION, is stored in the same way as
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* egw_session::appsession() so both methods can be used with each other.
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*
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* The $app parameter should be either the app or the class name, which both are unique.
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*
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* The tree and instance wide cache uses a certain provider class, to store the data
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* eg. in memcached or if there's nothing else configured in the filesystem (eGW's temp_dir).
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*
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* "Admin >> clear cache and register hooks" always only clears instance level cache of
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* calling instance. It never clears tree level cache, which makes it important to set
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* reasonable expiry times or think about an other means of clearing that particular item.
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* (Not clearing of tree-level cache is important, as regenerating it is an expensive
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* operation for a huge scale EGroupware hosting operation.)
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*
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* Apps needing to talk to multiple EGroupware instances (eg. EGroupware Managementserver)
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* can use install_id of instance as $level parameter to (set|get|unset)Cache method.
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*
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* If a callback is used to calculate the data, in case it's not found in the cache, e.g.:
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* $data = Api\Cache::getCache(Api\Cache::(TREE|INSTANCE), $app, $location, function($params)
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* {
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* // code to calculate / query $data
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* return $data;
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* }, $params, $expiration);
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* then we lock the $app:$location by storing some specific data, so only one callback is used
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* to calculate the data, and other processes sleep until the data is calculate to avoid races.
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*/
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class Cache
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{
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/**
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* tree-wide storage
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*/
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const TREE = 'Tree';
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/**
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* instance-wide storage
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*/
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const INSTANCE = 'Instance';
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/**
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* session-wide storage
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*/
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const SESSION = 'Session';
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/**
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* request-wide storage
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*/
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const REQUEST = 'Request';
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/**
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* Default provider for tree and instance data
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*
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* Can be specified eg. in the header.inc.php by setting:
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* $GLOBALS['egw_info']['server']['cache_provider_instance'] and optional
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* $GLOBALS['egw_info']['server']['cache_provider_tree'] (defaults to instance)
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*
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* Default is set (if not set here) after class definition to Cache\Apc or Cache\Files,
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* depending on function 'apc_fetch' exists or not
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*
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* @var array
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*/
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static $default_provider; // = array('EGroupware\Api\Cache\Files');// array('EGroupware\Api\Cache\Memcache','localhost');
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/**
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* Maximum expiration time, if set unlimited expiration (=0) or bigger expiration times are replaced with that time
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*
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* @var int
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*/
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static $max_expiration;
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/**
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* Used to determine keys for tree- and instance-level caches
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*
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* @var string
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*/
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static $egw_server_root = EGW_SERVER_ROOT;
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/**
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* Add some data in the cache, only if the key does not yet exist
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*
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* @param string $level use Api\Cache::(TREE|INSTANCE)
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise incl. key already existed
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*/
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public static function addCache($level,$app,$location,$data,$expiration=0)
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{
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//error_log(__METHOD__."('$level','$app','$location',".array2string($data).",$expiration)");
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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throw new Exception\WrongParameter(__METHOD__."('$level', ...) unsupported level parameter!");
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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// limit expiration to configured maximum time
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if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
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{
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$expiration = self::$max_expiration;
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}
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return $provider->add(self::keys($level,$app,$location),$data,$expiration);
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}
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throw new Exception\WrongParameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Set some data in the cache
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*
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* @param string $level use Cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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public static function setCache($level,$app,$location,$data,$expiration=0)
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{
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//error_log(__METHOD__."('$level','$app','$location',".array2string($data).",$expiration)");
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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return call_user_func(array(__CLASS__,'set'.$level),$app,$location,$data,$expiration);
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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// limit expiration to configured maximum time
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if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
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{
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$expiration = self::$max_expiration;
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}
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return $provider->set(self::keys($level,$app,$location),$data,$expiration);
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}
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throw new Exception\WrongParameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Increment some value in the cache
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*
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* @param string $level use Cache::(TREE|INSTANCE), Cache::(SESSION|REQUEST) are NOT supported!
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* @param string $app application storing data
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* @param string $location location name for data
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* @param int $offset =1 how much to increment by
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* @param int $intial_value =0 value to set and return, if not in cache
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* @param int $expiration =0
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* @return false|int new value on success, false on error
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*/
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public static function incrementCache(string $level, string $app, string $location, int $offset=1, int $intial_value=0, int $expiration=0)
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{
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//error_log(__METHOD__."('$level', '$app', '$location', $offset, $inital_value, $expiration)");
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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break;
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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// limit expiration to configured maximum time
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if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
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{
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$expiration = self::$max_expiration;
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}
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return $provider->increment(self::keys($level, $app, $location), $offset, $intial_value, $expiration);
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}
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throw new Exception\WrongParameter(__METHOD__."() unsupported level '$level'!");
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}
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/**
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* Decrements value in cache, but never below 0
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*
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* If new value would be below 0, 0 will be set as new value!
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*
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* @param string $level use Cache::(TREE|INSTANCE), Cache::(SESSION|REQUEST) are NOT supported!
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* @param string $app application storing data
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* @param string $location location name for data
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* @param int $offset =1 how much to increment by
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* @param int $intial_value =0 value to set and return, if not in cache
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* @param int $expiration =0
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* @return false|int new value on success, false on error
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*/
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public static function decrementCache(string $level, string $app, string $location, int $offset=1, int $intial_value=0, int $expiration=0)
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{
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//error_log(__METHOD__."('$level', '$app', '$location', $offset, $inital_value, $expiration)");
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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break;
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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// limit expiration to configured maximum time
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if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
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{
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$expiration = self::$max_expiration;
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}
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return $provider->decrement(self::keys($level, $app, $location), $offset, $intial_value, $expiration);
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}
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throw new Exception\WrongParameter(__METHOD__."() unsupported level '$level'!");
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}
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/**
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* Content stored to signal one callback is already running and calculating the data, to not run it multiple times
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*/
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const CALLBACK_LOCK = '***LOCKED***';
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/**
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* Maximum time an item is locked, to recover from eg. a crash while the lock is set
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*/
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const CALLBACL_LOCK_TIMEOUT = 10; // 10s
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/**
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* Time other processes sleep to wait for one callback to calculate the data
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*/
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const CALLBACK_LOCK_USLEEP = 50000; // 50ms
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/**
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* Get some data from the cache
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*
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* @param string $level use Api\Cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string|array $location location(s) name for data
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* @param callback $callback =null callback to get/create the value, if it's not cache
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* @param array $callback_params =array() array with parameters for the callback
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified) or
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* if $location is an array: location => data pairs for existing location-data, non-existing is not returned
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*/
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public static function getCache($level,$app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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foreach((array)$location as $l)
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{
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$data[$l] = call_user_func(array(__CLASS__,'get'.$level),$app,$l,$callback,$callback_params,$expiration);
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}
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return is_array($location) ? $data : $data[$l];
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level)))
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{
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return null;
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}
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try {
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if (is_array($location))
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{
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if (!is_null($callback))
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{
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throw new Exception\WrongParameter(__METHOD__."() you can NOT use multiple locations (\$location parameter is an array) together with a callback!");
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}
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if (is_a($provider, 'EGroupware\Api\Cache\ProviderMultiple'))
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{
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$data = $provider->mget($keys=self::keys($level,$app,$location));
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}
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else // default implementation calls get multiple times
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{
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$data = array();
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foreach($location as $l)
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{
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$data[$l] = $provider->get($keys=self::keys($level,$app,$l));
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if (!isset($data[$l])) unset($data[$l]);
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}
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}
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}
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else
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{
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// try reading cached data and, if not found AND a callback to do so given, calculate it
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// only allow one process to do the (heavy) calculation by storing some lock-data
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// other processes reading the lock-data sleep for a short time, before try reading it again
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for($n=10+self::CALLBACL_LOCK_TIMEOUT*1000000/self::CALLBACK_LOCK_USLEEP; $n >= 0; $n--)
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{
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$data = $provider->get($keys=self::keys($level,$app,$location));
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if ($data === self::CALLBACK_LOCK)
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{
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usleep(self::CALLBACK_LOCK_USLEEP);
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}
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elseif($data === null && isset($callback))
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{
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$provider->set($keys, self::CALLBACK_LOCK, self::CALLBACL_LOCK_TIMEOUT);
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try {
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$data = call_user_func_array($callback, $callback_params);
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}
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catch(\Throwable $e) {
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// remove lock, before re-throwing the exception/error
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$provider->delete($keys);
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throw $e;
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}
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// limit expiration to configured maximum time
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if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
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{
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$expiration = self::$max_expiration;
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}
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$provider->set($keys, $data, $expiration);
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break;
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}
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else
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{
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break;
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}
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}
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}
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}
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catch(Exception $e) {
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unset($e);
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$data = null;
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}
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return $data;
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}
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throw new Exception\WrongParameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Unset some data in the cache
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*
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* @param string $level use Api\Cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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public static function unsetCache($level,$app,$location)
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{
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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return call_user_func(array(__CLASS__,'unset'.$level),$app,$location);
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case self::INSTANCE:
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case self::TREE:
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default:
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if (!($provider = self::get_provider($level, false)))
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{
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return false;
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}
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return $provider->delete(self::keys($level,$app,$location));
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}
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throw new Exception\WrongParameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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public static function setTree($app,$location,$data,$expiration=0)
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{
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//error_log(__METHOD__."('$app','$location',".array2string($data).",$expiration)");
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return self::setCache(self::TREE,$app,$location,$data,$expiration);
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback =null callback to get/create the value, if it's not cache
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* @param array $callback_params =array() array with parameters for the callback
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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public static function getTree($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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return self::getCache(self::TREE,$app,$location,$callback,$callback_params,$expiration);
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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public static function unsetTree($app,$location)
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{
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return self::unsetCache(self::TREE,$app,$location);
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}
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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public static function setInstance($app,$location,$data,$expiration=0)
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{
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return self::setCache(self::INSTANCE,$app,$location,$data,$expiration);
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback =null callback to get/create the value, if it's not cache
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* @param array $callback_params =array() array with parameters for the callback
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* @param int $expiration =0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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public static function getInstance($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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return self::getCache(self::INSTANCE,$app,$location,$callback,$callback_params,$expiration);
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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public static function unsetInstance($app,$location)
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{
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return self::unsetCache(self::INSTANCE,$app,$location);
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}
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/**
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* Prefix for appname to store expiration time in session cache
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*/
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const SESSION_EXPIRATION_PREFIX = '*expiration*';
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @param mixed $data
|
|
* @param int $expiration =0 expiration time in seconds, default 0 = never
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
public static function setSession($app,$location,$data,$expiration=0)
|
|
{
|
|
if (isset($_SESSION[Session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (Session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
|
|
return false; // can no longer store something in the session, eg. because commit_session() was called
|
|
}
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][$app][$location] = $data;
|
|
|
|
if ($expiration > 0)
|
|
{
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location] = time()+$expiration;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get some data from the cache for the whole source tree (all instances)
|
|
*
|
|
* Returns a reference to the var in the session!
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @param callback $callback =null callback to get/create the value, if it's not cache
|
|
* @param array $callback_params =array() array with parameters for the callback
|
|
* @param int $expiration =0 expiration time in seconds, default 0 = never
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
public static function &getSession($app, $location, $callback=null, array $callback_params=array(), $expiration=0)
|
|
{
|
|
if (isset($_SESSION[Session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (Session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
|
|
$ret = null; // can no longer store something in the session, eg. because commit_session() was called
|
|
return $ret;
|
|
}
|
|
// check if entry is expired and clean it up in that case
|
|
if (isset($_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location]) &&
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location] < time())
|
|
{
|
|
unset($_SESSION[Session::EGW_APPSESSION_VAR][$app][$location],
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location]);
|
|
}
|
|
if (!isset($_SESSION[Session::EGW_APPSESSION_VAR][$app][$location]) && !is_null($callback))
|
|
{
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][$app][$location] = call_user_func_array($callback,$callback_params);
|
|
}
|
|
return $_SESSION[Session::EGW_APPSESSION_VAR][$app][$location];
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
public static function unsetSession($app,$location)
|
|
{
|
|
if (isset($_SESSION[Session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (Session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
|
|
return false; // can no longer store something in the session, eg. because commit_session() was called
|
|
}
|
|
// check if entry is expired and clean it up in that case
|
|
if (isset($_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location]) &&
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location] < time())
|
|
{
|
|
unset($_SESSION[Session::EGW_APPSESSION_VAR][$app][$location],
|
|
$_SESSION[Session::EGW_APPSESSION_VAR][self::SESSION_EXPIRATION_PREFIX.$app][$location]);
|
|
}
|
|
if (!isset($_SESSION[Session::EGW_APPSESSION_VAR][$app][$location]))
|
|
{
|
|
return false;
|
|
}
|
|
unset($_SESSION[Session::EGW_APPSESSION_VAR][$app][$location]);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Static varible to cache request wide
|
|
*
|
|
* @var array
|
|
*/
|
|
private static $request_cache = array();
|
|
|
|
/**
|
|
* Set some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @param mixed $data
|
|
* @param int $expiration =0 expiration time is NOT used for REQUEST!
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
public static function setRequest($app,$location,$data,$expiration=0)
|
|
{
|
|
unset($expiration); // not used, but required by function signature
|
|
self::$request_cache[$app][$location] = $data;
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get some data from the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @param callback $callback =null callback to get/create the value, if it's not cache
|
|
* @param array $callback_params =array() array with parameters for the callback
|
|
* @param int $expiration =0 expiration time is NOT used for REQUEST!
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
public static function getRequest($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
unset($expiration); // not used, but required by function signature
|
|
if (!isset(self::$request_cache[$app][$location]) && !is_null($callback))
|
|
{
|
|
self::$request_cache[$app][$location] = call_user_func_array($callback,$callback_params);
|
|
}
|
|
return self::$request_cache[$app][$location];
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
public static function unsetRequest($app,$location)
|
|
{
|
|
if (!isset(self::$request_cache[$app][$location]))
|
|
{
|
|
return false;
|
|
}
|
|
unset(self::$request_cache[$app][$location]);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Get a caching provider for tree or instance level
|
|
*
|
|
* The returned provider already has an opened connection
|
|
*
|
|
* @param string $level Api\Cache::(TREE|INSTANCE) or install_id
|
|
* @param boolean $log_not_found =true false do not log if no provider found, used eg. to supress error via unsetCache during installation
|
|
* @return Cache\Provider|Cache\ProviderMultiple
|
|
*/
|
|
static protected function get_provider($level, $log_not_found=true)
|
|
{
|
|
static $providers = array();
|
|
|
|
if ($level != self::TREE) $level = self::INSTANCE;
|
|
|
|
if (!isset($providers[$level]))
|
|
{
|
|
$params = $GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)];
|
|
if (!isset($params) && $level == self::INSTANCE && isset(self::$default_provider))
|
|
{
|
|
$params = self::$default_provider;
|
|
}
|
|
if (!isset($params))
|
|
{
|
|
if ($level == self::TREE) // if no tree level provider use the instance level one
|
|
{
|
|
$providers[$level] = self::get_provider(self::INSTANCE);
|
|
}
|
|
else
|
|
{
|
|
$providers[$level] = false; // no provider specified
|
|
$reason = 'no provider specified';
|
|
}
|
|
}
|
|
elseif (!$params)
|
|
{
|
|
$providers[$level] = false; // cache for $level disabled
|
|
$reason = "cache for $level disabled";
|
|
}
|
|
else
|
|
{
|
|
if (!is_array($params)) $params = (array)$params;
|
|
|
|
$class = array_shift($params);
|
|
if (!class_exists($class))
|
|
{
|
|
$providers[$level] = false; // provider class not found
|
|
$reason = "provider $class not found";
|
|
}
|
|
else
|
|
{
|
|
try
|
|
{
|
|
$providers[$level] = new $class($params);
|
|
}
|
|
catch(Exception $e)
|
|
{
|
|
$providers[$level] = false; // eg. could not open connection to backend
|
|
$reason = "error instanciating provider $class: ".$e->getMessage();
|
|
}
|
|
}
|
|
}
|
|
if (!$providers[$level] && $log_not_found) error_log(__METHOD__."($level) no provider found ($reason)!".function_backtrace());
|
|
}
|
|
//error_log(__METHOD__."($level) = ".array2string($providers[$level]).', cache_provider='.array2string($GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)]));
|
|
return $providers[$level];
|
|
}
|
|
|
|
/**
|
|
* Get class-name of caching provider
|
|
*
|
|
* @param string $level
|
|
* @return string class-name of provider
|
|
*/
|
|
public static function getProvider($level=self::INSTANCE)
|
|
{
|
|
$provider = self::get_provider($level);
|
|
|
|
return get_class($provider);
|
|
}
|
|
|
|
/**
|
|
* Get a system configuration, even if in setup and it's not read
|
|
*
|
|
* @param string $name
|
|
* @param boolean $throw =true throw an exception, if we can't retriev the value
|
|
* @return string|boolean string with config or false if not found and !$throw
|
|
*/
|
|
public static function get_system_config($name, $throw=true)
|
|
{
|
|
if(!isset($GLOBALS['egw_info']['server'][$name]))
|
|
{
|
|
if (isset($GLOBALS['egw_setup']) && isset($GLOBALS['egw_setup']->db) || $GLOBALS['egw']->db)
|
|
{
|
|
$db = $GLOBALS['egw']->db ? $GLOBALS['egw']->db : $GLOBALS['egw_setup']->db;
|
|
|
|
try {
|
|
if (($rs = $db->select(Config::TABLE,'config_value',array(
|
|
'config_app' => 'phpgwapi',
|
|
'config_name' => $name,
|
|
),__LINE__,__FILE__)))
|
|
{
|
|
$GLOBALS['egw_info']['server'][$name] = $rs->fetchColumn();
|
|
}
|
|
else
|
|
{
|
|
error_log(__METHOD__."('$name', $throw) config value NOT found!");//.function_backtrace());
|
|
}
|
|
}
|
|
catch(Db\Exception $e)
|
|
{
|
|
if ($throw) error_log(__METHOD__."('$name', $throw) cound NOT query value: ".$e->getMessage());//.function_backtrace());
|
|
}
|
|
}
|
|
if (!$GLOBALS['egw_info']['server'][$name] && $throw)
|
|
{
|
|
throw new Exception (__METHOD__."($name) \$GLOBALS['egw_info']['server']['$name'] is NOT set!");
|
|
}
|
|
}
|
|
return $GLOBALS['egw_info']['server'][$name];
|
|
}
|
|
|
|
/**
|
|
* Flush (delete) whole (instance) cache or application/class specific part of it
|
|
*
|
|
* @param string $level =self::INSTANCE
|
|
* @param string $app =null app-name or "all" to empty complete cache
|
|
*/
|
|
public static function flush($level=self::INSTANCE, $app=null)
|
|
{
|
|
$ret = true;
|
|
if (!($provider = self::get_provider($level)))
|
|
{
|
|
$ret = false;
|
|
}
|
|
else
|
|
{
|
|
if (!$provider->flush($app !== "all" ? self::keys($level, $app) : array()))
|
|
{
|
|
if ($level == self::INSTANCE)
|
|
{
|
|
self::generate_instance_key();
|
|
}
|
|
else
|
|
{
|
|
$ret = false;
|
|
}
|
|
}
|
|
}
|
|
//error_log(__METHOD__."('$level', '$app') returning ".array2string($ret));
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Unset instance key, so it get read again and re-read install_id from database
|
|
*/
|
|
public static function unset_instance_key()
|
|
{
|
|
self::$instance_key = null;
|
|
$GLOBALS['egw_info']['server']['install_id'] = self::get_system_config('install_id', false);
|
|
}
|
|
|
|
/**
|
|
* Key used for instance specific data
|
|
*
|
|
* @var string
|
|
*/
|
|
private static $instance_key;
|
|
|
|
/**
|
|
* Generate a new instance key and by doing so effectivly flushes whole instance cache
|
|
*
|
|
* @param string $install_id =null default use install_id of current instance
|
|
* @return string new key also stored in self::$instance_key
|
|
*/
|
|
public static function generate_instance_key($install_id=null)
|
|
{
|
|
if (!isset($install_id))
|
|
{
|
|
self::$instance_key = null;
|
|
$install_id = self::get_system_config('install_id');
|
|
}
|
|
$instance_key = self::INSTANCE.'-'.$install_id.'-'.microtime(true);
|
|
self::setTree(__CLASS__, $install_id, $instance_key);
|
|
|
|
//error_log(__METHOD__."(install_id='$install_id') returning '".$instance_key."'");
|
|
return $instance_key;
|
|
}
|
|
|
|
/**
|
|
* Get keys array from $level, $app and $location
|
|
*
|
|
* @param string $level Api\Cache::(TREE|INSTANCE) or instance_id
|
|
* @param string $app =null
|
|
* @param string $location =null
|
|
* @return array
|
|
*/
|
|
public static function keys($level, $app=null, $location=null)
|
|
{
|
|
static $tree_key = null;
|
|
|
|
switch($level)
|
|
{
|
|
case self::TREE:
|
|
if (!isset($tree_key))
|
|
{
|
|
$tree_key = $level.'-'.str_replace(array(':','/','\\'),'-', self::$egw_server_root);
|
|
// add charset to key, if not utf-8 (as everything we store depends on charset!)
|
|
if (($charset = self::get_system_config('system_charset',false)) && $charset != 'utf-8')
|
|
{
|
|
$tree_key .= '-'.$charset;
|
|
}
|
|
}
|
|
$level_key = $tree_key;
|
|
break;
|
|
default: // arbitrary install_id given --> check for current instance
|
|
if ($level !== $GLOBALS['egw_info']['server']['install_id'])
|
|
{
|
|
$level_key = self::getTree(__CLASS__, $level);
|
|
if (!isset($level_key)) $level_key = self::generate_instance_key($level);
|
|
break;
|
|
}
|
|
// fall-through for current instance
|
|
case self::INSTANCE:
|
|
if (!isset(self::$instance_key))
|
|
{
|
|
self::$instance_key = self::getTree(__CLASS__, self::get_system_config('install_id'));
|
|
//error_log(__METHOD__."('$level',...) instance_key read from tree-cache=".array2string(self::$instance_key));
|
|
if (!isset(self::$instance_key)) self::$instance_key = self::generate_instance_key();
|
|
}
|
|
$level_key = self::$instance_key;
|
|
break;
|
|
}
|
|
$keys = array($level_key);
|
|
if (isset($app))
|
|
{
|
|
$keys[] = $app;
|
|
if (isset($location)) $keys[] = $location;
|
|
}
|
|
return $keys;
|
|
}
|
|
|
|
/**
|
|
* Let everyone know the methods of this class should be used only statically
|
|
*
|
|
*/
|
|
function __construct()
|
|
{
|
|
throw new Exception\WrongParameter("All methods of class ".__CLASS__." should be called static!");
|
|
}
|
|
}
|
|
|
|
// setting apc(u) as default provider, if apc(u)_fetch function exists AND further checks in Api\Cache\Apc(u) recommed it
|
|
if (is_null(Cache::$default_provider))
|
|
{
|
|
Cache::$default_provider =
|
|
PHP_SAPI === 'cli' ? 'EGroupware\Api\Cache\Files' :
|
|
(function_exists('apcu_fetch') && Cache\Apcu::available() ? 'EGroupware\Api\Cache\Apcu' :
|
|
(function_exists('apc_fetch') && Cache\Apc::available() ? 'EGroupware\Api\Cache\Apc' :
|
|
'EGroupware\Api\Cache\Files'));
|
|
}
|
|
|
|
//error_log('Cache::$default_provider='.array2string(Cache::$default_provider));
|