mirror of
https://github.com/EGroupware/egroupware.git
synced 2024-10-05 17:42:18 +02:00
565 lines
19 KiB
PHP
565 lines
19 KiB
PHP
<?php
|
|
/**
|
|
* eGroupWare API: Caching data
|
|
*
|
|
* @link http://www.egroupware.org
|
|
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
|
|
* @package api
|
|
* @subpackage cache
|
|
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
|
|
* @copyright (c) 2009/10 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
|
|
* @version $Id$
|
|
*/
|
|
|
|
/**
|
|
* Class to manage caching in eGroupware.
|
|
*
|
|
* It allows to cache on 4 levels:
|
|
* a) tree: for all instances/domains runining on a certain source path
|
|
* b) instance: for all sessions on a given instance
|
|
* c) session: for all requests of a session, same as egw_session::appsession()
|
|
* d) request: just for this request (same as using a static variable)
|
|
*
|
|
* There's a get, a set and a unset method for each level: eg. getTree() or setInstance(),
|
|
* as well as a variant allowing to specify the level as first parameter: eg. unsetCache()
|
|
*
|
|
* getXXX($app,$location,$callback=null,array $callback_params,$expiration=0)
|
|
* has three optional parameters allowing to specify:
|
|
* 3. a callback if requested data is not yes stored. In that case the callback is called
|
|
* and it's value is stored in the cache AND retured
|
|
* 4. parameters to pass to the callback as array, see call_user_func_array
|
|
* 5. an expiration time in seconds to specify how long data should be cached,
|
|
* default 0 means infinit (this time is not garantied and not supported for all levels!)
|
|
*
|
|
* Data is stored under an application name and a location, like egw_session::appsession().
|
|
* In fact data stored at cache level egw_cache::SESSION, is stored in the same way as
|
|
* egw_session::appsession() so both methods can be used with each other.
|
|
*
|
|
* The $app parameter should be either the app or the class name, which both are unique.
|
|
*
|
|
* The tree and instance wide cache uses a certain provider class, to store the data
|
|
* eg. in memcached or if there's nothing else configured in the filesystem (eGW's temp_dir).
|
|
*/
|
|
class egw_cache
|
|
{
|
|
/**
|
|
* tree-wide storage
|
|
*/
|
|
const TREE = 'Tree';
|
|
/**
|
|
* instance-wide storage
|
|
*/
|
|
const INSTANCE = 'Instance';
|
|
/**
|
|
* session-wide storage
|
|
*/
|
|
const SESSION = 'Session';
|
|
/**
|
|
* request-wide storage
|
|
*/
|
|
const REQUEST = 'Request';
|
|
|
|
/**
|
|
* Default provider for tree and instance data
|
|
*
|
|
* Can be specified eg. in the header.inc.php by setting:
|
|
* $GLOBALS['egw_info']['server']['cache_provider_instance'] and optional
|
|
* $GLOBALS['egw_info']['server']['cache_provider_tree'] (defaults to instance)
|
|
*
|
|
* Default is set (if not set here) after class definition to egw_cache_apc or egw_cache_files,
|
|
* depending on function 'apc_fetch' exists or not
|
|
*
|
|
* @var array
|
|
*/
|
|
static $default_provider; // = array('egw_cache_files');// array('egw_cache_memcache','localhost');
|
|
|
|
/**
|
|
* Set some data in the cache
|
|
*
|
|
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @param mixed $data
|
|
* @param int $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
static public function setCache($level,$app,$location,$data,$expiration=0)
|
|
{
|
|
//error_log(__METHOD__."('$level','$app','$location',".array2string($data).",$expiration)");
|
|
switch($level)
|
|
{
|
|
case self::SESSION:
|
|
case self::REQUEST:
|
|
return call_user_func(array(__CLASS__,'set'.$level),$app,$location,$data,$expiration);
|
|
|
|
case self::INSTANCE:
|
|
case self::TREE:
|
|
if (!($provider = self::get_provider($level)))
|
|
{
|
|
return false;
|
|
}
|
|
return $provider->set(self::keys($level,$app,$location),$data,$expiration);
|
|
}
|
|
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
|
|
}
|
|
|
|
/**
|
|
* Get some data from the cache
|
|
*
|
|
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
|
|
* @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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
static public function getCache($level,$app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
switch($level)
|
|
{
|
|
case self::SESSION:
|
|
case self::REQUEST:
|
|
return call_user_func(array(__CLASS__,'get'.$level),$app,$location,$callback,$callback_params,$expiration);
|
|
|
|
case self::INSTANCE:
|
|
case self::TREE:
|
|
if (!($provider = self::get_provider($level)))
|
|
{
|
|
return null;
|
|
}
|
|
$data = $provider->get($keys=self::keys($level,$app,$location));
|
|
if (is_null($data) && !is_null($callback))
|
|
{
|
|
//error_log(__METHOD__."($level,$app,$location,".array2string($callback).','.array2string($callback_params).",$expiration) calling calback to create data.");
|
|
$data = call_user_func_array($callback,$callback_params);
|
|
$provider->set($keys,$data,$expiration);
|
|
}
|
|
return $data;
|
|
}
|
|
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache
|
|
*
|
|
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
static public function unsetCache($level,$app,$location)
|
|
{
|
|
switch($level)
|
|
{
|
|
case self::SESSION:
|
|
case self::REQUEST:
|
|
return call_user_func(array(__CLASS__,'unset'.$level),$app,$location);
|
|
|
|
case self::INSTANCE:
|
|
case self::TREE:
|
|
if (!($provider = self::get_provider($level)))
|
|
{
|
|
return false;
|
|
}
|
|
return $provider->delete(self::keys($level,$app,$location));
|
|
}
|
|
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
|
|
}
|
|
|
|
/**
|
|
* 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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
static public function setTree($app,$location,$data,$expiration=0)
|
|
{
|
|
//error_log(__METHOD__."('$app','$location',".array2string($data).",$expiration)");
|
|
return self::setCache(self::TREE,$app,$location,$data,$expiration);
|
|
}
|
|
|
|
/**
|
|
* 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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
static public function getTree($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
return self::getCache(self::TREE,$app,$location,$callback,$callback_params,$expiration);
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
static public function unsetTree($app,$location)
|
|
{
|
|
return self::unsetCache(self::TREE,$app,$location);
|
|
}
|
|
|
|
/**
|
|
* 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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
static public function setInstance($app,$location,$data,$expiration=0)
|
|
{
|
|
return self::setCache(self::INSTANCE,$app,$location,$data,$expiration);
|
|
}
|
|
|
|
/**
|
|
* 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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
static public function getInstance($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
return self::getCache(self::INSTANCE,$app,$location,$callback,$callback_params,$expiration);
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
static public function unsetInstance($app,$location)
|
|
{
|
|
return self::unsetCache(self::INSTANCE,$app,$location);
|
|
}
|
|
|
|
/**
|
|
* 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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
static public function setSession($app,$location,$data,$expiration=0)
|
|
{
|
|
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (egw_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
|
|
}
|
|
$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = $data;
|
|
|
|
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 $expiration=0 expiration time in seconds, default 0 = never
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
static public function &getSession($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
|
|
return null; // can no longer store something in the session, eg. because commit_session() was called
|
|
}
|
|
if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]) && !is_null($callback))
|
|
{
|
|
$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = call_user_func_array($callback,$callback_params);
|
|
}
|
|
return $_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location];
|
|
}
|
|
|
|
/**
|
|
* Unset some data in the cache for the whole source tree (all instances)
|
|
*
|
|
* @param string $app application storing data
|
|
* @param string $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
static public function unsetSession($app,$location)
|
|
{
|
|
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
|
|
{
|
|
if (egw_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
|
|
}
|
|
if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]))
|
|
{
|
|
return false;
|
|
}
|
|
unset($_SESSION[egw_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 $expiration=0 expiration time is NOT used for REQUEST!
|
|
* @return boolean true if data could be stored, false otherwise
|
|
*/
|
|
static public function setRequest($app,$location,$data,$expiration=0)
|
|
{
|
|
self::$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 $expiration=0 expiration time is NOT used for REQUEST!
|
|
* @return mixed NULL if data not found in cache (and no callback specified)
|
|
*/
|
|
static public function getRequest($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
|
|
{
|
|
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 $location location name for data
|
|
* @return boolean true if data was set, false if not (like isset())
|
|
*/
|
|
static public function unsetRequest($app,$location)
|
|
{
|
|
if (!isset(self::$request_cache[$app][$location]))
|
|
{
|
|
return false;
|
|
}
|
|
unset(self::$request_cache[$app][$location]);
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Get a caching provider for tree or instance level
|
|
*
|
|
* The returned provider already has an opened connection
|
|
*
|
|
* @param string $level egw_cache::(TREE|INSTANCE)
|
|
* @return egw_cache_provider
|
|
*/
|
|
static protected function get_provider($level)
|
|
{
|
|
static $providers = array();
|
|
|
|
if (!isset($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]) error_log(__METHOD__."($level) no provider found ($reason)!");
|
|
}
|
|
//error_log(__METHOD__."($level) = ".array2string($providers[$level]).', cache_provider='.array2string($GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)]));
|
|
return $providers[$level];
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
static protected function get_system_config($name,$throw=true)
|
|
{
|
|
if(!isset($GLOBALS['egw_info']['server'][$name]))
|
|
{
|
|
if (isset($GLOBALS['egw_setup']) && isset($GLOBALS['egw_setup']->db))
|
|
{
|
|
$GLOBALS['egw_info']['server'][$name] = $GLOBALS['egw_setup']->db->select(config::TABLE,'config_value',array(
|
|
'config_app' => 'phpgwapi',
|
|
'config_name' => $name,
|
|
),__LINE__,__FILE__)->fetchColumn();
|
|
}
|
|
if (!$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];
|
|
}
|
|
|
|
/**
|
|
* Get keys array from $level, $app and $location
|
|
*
|
|
* @param string $level egw_cache::(TREE|INSTANCE)
|
|
* @param string $app
|
|
* @param string $location
|
|
* @return array
|
|
*/
|
|
static public function keys($level,$app,$location)
|
|
{
|
|
static $bases = array();
|
|
|
|
if (!isset($bases[$level]))
|
|
{
|
|
switch($level)
|
|
{
|
|
case self::TREE:
|
|
$bases[$level] = $level.'-'.str_replace(array(':','/','\\'),'-',EGW_SERVER_ROOT);
|
|
// add charset to key, if not utf-8 (as everything we store depends on charset!)
|
|
if (($charset = self::get_system_config('system_charset',false)) && $charset != 'utf-8')
|
|
{
|
|
$bases[$level] .= '-'.$charset;
|
|
}
|
|
break;
|
|
case self::INSTANCE:
|
|
$bases[$level] = $level.'-'.self::get_system_config('install_id');
|
|
break;
|
|
}
|
|
}
|
|
return array($bases[$level],$app,$location);
|
|
}
|
|
|
|
/**
|
|
* Let everyone know the methods of this class should be used only statically
|
|
*
|
|
*/
|
|
function __construct()
|
|
{
|
|
throw new egw_exception_wrong_parameter("All methods of class ".__CLASS__." should be called static!");
|
|
}
|
|
}
|
|
|
|
// setting apc as default provide, if apc_fetch function exists
|
|
if (is_null(egw_cache::$default_provider))
|
|
{
|
|
egw_cache::$default_provider = function_exists('apc_fetch') ? 'egw_cache_apc' : 'egw_cache_files';
|
|
}
|
|
|
|
/**
|
|
* Interface for a caching provider for tree and instance level
|
|
*
|
|
* The provider can eg. create subdirs under /tmp for each key
|
|
* to store data as a file or concat them with a separator to
|
|
* get a single string key to eg. store data in memcached
|
|
*/
|
|
interface egw_cache_provider
|
|
{
|
|
/**
|
|
* Constructor, eg. opens the connection to the backend
|
|
*
|
|
* @throws Exception if connection to backend could not be established
|
|
* @param array $params eg. array(host,port) or array(directory) depending on the provider
|
|
*/
|
|
function __construct(array $params);
|
|
|
|
/**
|
|
* Stores some data in the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @param mixed $data
|
|
* @param int $expiration=0
|
|
* @return boolean true on success, false on error
|
|
*/
|
|
function set(array $keys,$data,$expiration=0);
|
|
|
|
/**
|
|
* Get some data from the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @return mixed data stored or NULL if not found in cache
|
|
*/
|
|
function get(array $keys);
|
|
|
|
/**
|
|
* Delete some data from the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @return boolean true on success, false on error (eg. $key not set)
|
|
*/
|
|
function delete(array $keys);
|
|
}
|