includes/MemcachedSessions.php

   1 <?php
   2 /**
   3  * This file gets included if $wgSessionsInMemcache is set in the config.
   4  * It redirects session handling functions to store their data in memcached
   5  * instead of the local filesystem. Depending on circumstances, it may also
   6  * be necessary to change the cookie settings to work across hostnames.
   7  * See: http://www.php.net/manual/en/function.session-set-save-handler.php
   8  *
   9  * @package MediaWiki
  10  */
  11
  12 /**
  13  * @todo document
  14  */
  15 function memsess_key( $id ) {
  16         return wfMemcKey( 'session', $id );
  17 }
  18
  19 /**
  20  * @todo document
  21  */
  22 function memsess_open( $save_path, $session_name ) {
  23         # NOP, $wgMemc should be set up already
  24         return true;
  25 }
  26
  27 /**
  28  * @todo document
  29  */
  30 function memsess_close() {
  31         # NOP
  32         return true;
  33 }
  34
  35 /**
  36  * @todo document
  37  */
  38 function memsess_read( $id ) {
  39         global $wgMemc;
  40         $data = $wgMemc->get( memsess_key( $id ) );
  41         if( ! $data ) return '';
  42         return $data;
  43 }
  44
  45 /**
  46  * @todo document
  47  */
  48 function memsess_write( $id, $data ) {
  49         global $wgMemc;
  50         $wgMemc->set( memsess_key( $id ), $data, 3600 );
  51         return true;
  52 }
  53
  54 /**
  55  * @todo document
  56  */
  57 function memsess_destroy( $id ) {
  58         global $wgMemc;
  59         $wgMemc->delete( memsess_key( $id ) );
  60         return true;
  61 }
  62
  63 /**
  64  * @todo document
  65  */
  66 function memsess_gc( $maxlifetime ) {
  67         # NOP: Memcached performs garbage collection.
  68         return true;
  69 }
  70
  71 session_set_save_handler( 'memsess_open', 'memsess_close', 'memsess_read', 'memsess_write', 'memsess_destroy', 'memsess_gc' );
  72
  73 ?>