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<?php
/**
* This file gets included if $wgSessionsInMemcache is set in the config.
* It redirects session handling functions to store their data in memcached
* instead of the local filesystem. Depending on circumstances, it may also
* be necessary to change the cookie settings to work across hostnames.
* See: http://www.php.net/manual/en/function.session-set-save-handler.php
*
* @file
* @ingroup Cache
*/
/**
* Get a cache key for the given session id.
*
* @param $id String: session id
* @return String: cache key
*/
function memsess_key( $id ) {
return wfMemcKey( 'session', $id );
}
/**
* Callback when opening a session.
* NOP: $wgMemc should be set up already.
*
* @param $save_path String: path used to store session files, unused
* @param $session_name String: session name
* @return Boolean: success
*/
function memsess_open( $save_path, $session_name ) {
return true;
}
/**
* Callback when closing a session.
* NOP.
*
* @return Boolean: success
*/
function memsess_close() {
return true;
}
/**
* Callback when reading session data.
*
* @param $id String: session id
* @return Mixed: session data
*/
function memsess_read( $id ) {
global $wgMemc;
$data = $wgMemc->get( memsess_key( $id ) );
if( ! $data ) return '';
return $data;
}
/**
* Callback when writing session data.
*
* @param $id String: session id
* @param $data Mixed: session data
* @return Boolean: success
*/
function memsess_write( $id, $data ) {
global $wgMemc;
$wgMemc->set( memsess_key( $id ), $data, 3600 );
return true;
}
/**
* Callback to destroy a session when calling session_destroy().
*
* @param $id String: session id
* @return Boolean: success
*/
function memsess_destroy( $id ) {
global $wgMemc;
$wgMemc->delete( memsess_key( $id ) );
return true;
}
/**
* Callback to execute garbage collection.
* NOP: Memcached performs garbage collection.
*
* @param $maxlifetime Integer: maximum session life time
* @return Boolean: success
*/
function memsess_gc( $maxlifetime ) {
return true;
}
session_set_save_handler( 'memsess_open', 'memsess_close', 'memsess_read', 'memsess_write', 'memsess_destroy', 'memsess_gc' );
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