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  * @file
  10  * @ingroup Cache
  11  */
  12
  13 /**
  14  * @todo document
  15  */
  16 function memsess_key( $id ) {
  17         return wfMemcKey( 'session', $id );
  18 }
  19
  20 /**
  21  * @todo document
  22  */
  23 function memsess_open( $save_path, $session_name ) {
  24         # NOP, $wgMemc should be set up already
  25         return true;
  26 }
  27
  28 /**
  29  * @todo document
  30  */
  31 function memsess_close() {
  32         # NOP
  33         return true;
  34 }
  35
  36 /**
  37  * @todo document
  38  */
  39 function memsess_read( $id ) {
  40         global $wgMemc;
  41         $data = $wgMemc->get( memsess_key( $id ) );
  42         if( ! $data ) return '';
  43         return $data;
  44 }
  45
  46 /**
  47  * @todo document
  48  */
  49 function memsess_write( $id, $data ) {
  50         global $wgMemc;
  51         $wgMemc->set( memsess_key( $id ), $data, 3600 );
  52         return true;
  53 }
  54
  55 /**
  56  * @todo document
  57  */
  58 function memsess_destroy( $id ) {
  59         global $wgMemc;
  60         $wgMemc->delete( memsess_key( $id ) );
  61         return true;
  62 }
  63
  64 /**
  65  * @todo document
  66  */
  67 function memsess_gc( $maxlifetime ) {
  68         # NOP: Memcached performs garbage collection.
  69         return true;
  70 }
  71
  72 session_set_save_handler( 'memsess_open', 'memsess_close', 'memsess_read', 'memsess_write', 'memsess_destroy', 'memsess_gc' );