737 lines
17 KiB
PHP
737 lines
17 KiB
PHP
<?php
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#
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# Copyright (C) 2003-2004 Brion Vibber <brion@pobox.com>
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# http://www.mediawiki.org/
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# http://www.gnu.org/copyleft/gpl.html
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/**
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* @defgroup Cache Cache
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*
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* @file
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* @ingroup Cache
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*/
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/**
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* interface is intended to be more or less compatible with
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* the PHP memcached client.
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*
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* backends for local hash array and SQL table included:
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* <code>
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* $bag = new HashBagOStuff();
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* $bag = new SqlBagOStuff(); # connect to db first
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* </code>
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*
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* @ingroup Cache
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*/
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abstract class BagOStuff {
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var $debugMode = false;
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public function set_debug( $bool ) {
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$this->debugMode = $bool;
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}
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/* *** THE GUTS OF THE OPERATION *** */
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/* Override these with functional things in subclasses */
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/**
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* Get an item with the given key. Returns false if it does not exist.
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* @param $key string
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*/
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abstract public function get( $key );
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/**
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* Set an item.
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* @param $key string
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* @param $value mixed
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* @param $exptime int Either an interval in seconds or a unix timestamp for expiry
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*/
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abstract public function set( $key, $value, $exptime = 0 );
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/*
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* Delete an item.
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* @param $key string
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* @param $time int Amount of time to delay the operation (mostly memcached-specific)
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*/
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abstract public function delete( $key, $time = 0 );
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public function lock( $key, $timeout = 0 ) {
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/* stub */
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return true;
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}
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public function unlock( $key ) {
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/* stub */
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return true;
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}
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public function keys() {
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/* stub */
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return array();
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}
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/* *** Emulated functions *** */
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/* Better performance can likely be got with custom written versions */
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public function get_multi( $keys ) {
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$out = array();
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foreach ( $keys as $key ) {
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$out[$key] = $this->get( $key );
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}
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return $out;
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}
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public function set_multi( $hash, $exptime = 0 ) {
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foreach ( $hash as $key => $value ) {
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$this->set( $key, $value, $exptime );
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}
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}
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public function add( $key, $value, $exptime = 0 ) {
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if ( $this->get( $key ) == false ) {
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$this->set( $key, $value, $exptime );
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return true;
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}
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}
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public function add_multi( $hash, $exptime = 0 ) {
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foreach ( $hash as $key => $value ) {
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$this->add( $key, $value, $exptime );
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}
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}
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public function delete_multi( $keys, $time = 0 ) {
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foreach ( $keys as $key ) {
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$this->delete( $key, $time );
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}
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}
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public function replace( $key, $value, $exptime = 0 ) {
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if ( $this->get( $key ) !== false ) {
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$this->set( $key, $value, $exptime );
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}
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}
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public function incr( $key, $value = 1 ) {
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if ( !$this->lock( $key ) ) {
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return false;
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}
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$value = intval( $value );
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$n = false;
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if ( ( $n = $this->get( $key ) ) !== false ) {
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$n += $value;
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$this->set( $key, $n ); // exptime?
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}
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$this->unlock( $key );
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return $n;
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}
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public function decr( $key, $value = 1 ) {
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return $this->incr( $key, - $value );
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}
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public function debug( $text ) {
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if ( $this->debugMode )
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wfDebug( "BagOStuff debug: $text\n" );
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}
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/**
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* Convert an optionally relative time to an absolute time
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*/
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protected function convertExpiry( $exptime ) {
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if ( ( $exptime != 0 ) && ( $exptime < 3600 * 24 * 30 ) ) {
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return time() + $exptime;
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} else {
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return $exptime;
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}
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}
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}
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/**
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* Functional versions!
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* This is a test of the interface, mainly. It stores things in an associative
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* array, which is not going to persist between program runs.
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*
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* @ingroup Cache
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*/
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class HashBagOStuff extends BagOStuff {
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var $bag;
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function __construct() {
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$this->bag = array();
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}
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protected function expire( $key ) {
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$et = $this->bag[$key][1];
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if ( ( $et == 0 ) || ( $et > time() ) ) {
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return false;
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}
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$this->delete( $key );
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return true;
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}
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function get( $key ) {
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if ( !isset( $this->bag[$key] ) ) {
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return false;
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}
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if ( $this->expire( $key ) ) {
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return false;
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}
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return $this->bag[$key][0];
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}
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function set( $key, $value, $exptime = 0 ) {
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$this->bag[$key] = array( $value, $this->convertExpiry( $exptime ) );
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}
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function delete( $key, $time = 0 ) {
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if ( !isset( $this->bag[$key] ) ) {
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return false;
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}
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unset( $this->bag[$key] );
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return true;
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}
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function keys() {
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return array_keys( $this->bag );
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}
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}
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/**
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* Class to store objects in the database
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*
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* @ingroup Cache
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*/
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class SqlBagOStuff extends BagOStuff {
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var $lb, $db;
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var $lastExpireAll = 0;
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protected function getDB() {
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global $wgDBtype;
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if ( !isset( $this->db ) ) {
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/* We must keep a separate connection to MySQL in order to avoid deadlocks
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* However, SQLite has an opposite behaviour.
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* @todo Investigate behaviour for other databases
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*/
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if ( $wgDBtype == 'sqlite' ) {
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$this->db = wfGetDB( DB_MASTER );
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} else {
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$this->lb = wfGetLBFactory()->newMainLB();
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$this->db = $this->lb->getConnection( DB_MASTER );
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$this->db->clearFlag( DBO_TRX );
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}
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}
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return $this->db;
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}
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public function get( $key ) {
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# expire old entries if any
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$this->garbageCollect();
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$db = $this->getDB();
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$row = $db->selectRow( 'objectcache', array( 'value', 'exptime' ),
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array( 'keyname' => $key ), __METHOD__ );
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if ( !$row ) {
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$this->debug( 'get: no matching rows' );
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return false;
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}
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$this->debug( "get: retrieved data; expiry time is " . $row->exptime );
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if ( $this->isExpired( $row->exptime ) ) {
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$this->debug( "get: key has expired, deleting" );
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try {
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$db->begin();
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# Put the expiry time in the WHERE condition to avoid deleting a
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# newly-inserted value
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$db->delete( 'objectcache',
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array(
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'keyname' => $key,
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'exptime' => $row->exptime
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), __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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}
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return false;
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}
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return $this->unserialize( $db->decodeBlob( $row->value ) );
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}
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public function set( $key, $value, $exptime = 0 ) {
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$db = $this->getDB();
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$exptime = intval( $exptime );
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if ( $exptime < 0 ) $exptime = 0;
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if ( $exptime == 0 ) {
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$encExpiry = $this->getMaxDateTime();
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} else {
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if ( $exptime < 3.16e8 ) # ~10 years
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$exptime += time();
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$encExpiry = $db->timestamp( $exptime );
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}
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try {
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$db->begin();
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$db->delete( 'objectcache', array( 'keyname' => $key ), __METHOD__ );
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$db->insert( 'objectcache',
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array(
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'keyname' => $key,
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'value' => $db->encodeBlob( $this->serialize( $value ) ),
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'exptime' => $encExpiry
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), __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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return false;
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}
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return true;
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}
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public function delete( $key, $time = 0 ) {
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$db = $this->getDB();
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try {
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$db->begin();
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$db->delete( 'objectcache', array( 'keyname' => $key ), __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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return false;
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}
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return true;
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}
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public function incr( $key, $step = 1 ) {
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$db = $this->getDB();
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$step = intval( $step );
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try {
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$db->begin();
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$row = $db->selectRow( 'objectcache', array( 'value', 'exptime' ),
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array( 'keyname' => $key ), __METHOD__, array( 'FOR UPDATE' ) );
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if ( $row === false ) {
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// Missing
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$db->commit();
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return false;
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}
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$db->delete( 'objectcache', array( 'keyname' => $key ), __METHOD__ );
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if ( $this->isExpired( $row->exptime ) ) {
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// Expired, do not reinsert
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$db->commit();
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return false;
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}
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$oldValue = intval( $this->unserialize( $db->decodeBlob( $row->value ) ) );
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$newValue = $oldValue + $step;
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$db->insert( 'objectcache',
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array(
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'keyname' => $key,
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'value' => $db->encodeBlob( $this->serialize( $newValue ) ),
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'exptime' => $row->exptime
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), __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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return false;
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}
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return $newValue;
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}
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public function keys() {
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$db = $this->getDB();
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$res = $db->select( 'objectcache', array( 'keyname' ), false, __METHOD__ );
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$result = array();
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foreach ( $res as $row ) {
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$result[] = $row->keyname;
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}
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return $result;
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}
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protected function isExpired( $exptime ) {
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return $exptime != $this->getMaxDateTime() && wfTimestamp( TS_UNIX, $exptime ) < time();
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}
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protected function getMaxDateTime() {
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if ( time() > 0x7fffffff ) {
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return $this->getDB()->timestamp( 1 << 62 );
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} else {
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return $this->getDB()->timestamp( 0x7fffffff );
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}
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}
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protected function garbageCollect() {
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/* Ignore 99% of requests */
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if ( !mt_rand( 0, 100 ) ) {
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$now = time();
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/* Avoid repeating the delete within a few seconds */
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if ( $now > ( $this->lastExpireAll + 1 ) ) {
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$this->lastExpireAll = $now;
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$this->expireAll();
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}
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}
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}
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public function expireAll() {
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$db = $this->getDB();
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$now = $db->timestamp();
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try {
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$db->begin();
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$db->delete( 'objectcache', array( 'exptime < ' . $db->addQuotes( $now ) ), __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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}
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}
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public function deleteAll() {
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$db = $this->getDB();
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try {
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$db->begin();
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$db->delete( 'objectcache', '*', __METHOD__ );
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$db->commit();
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} catch ( DBQueryError $e ) {
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$this->handleWriteError( $e );
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}
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}
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/**
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* Serialize an object and, if possible, compress the representation.
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* On typical message and page data, this can provide a 3X decrease
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* in storage requirements.
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*
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* @param $data mixed
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* @return string
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*/
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protected function serialize( &$data ) {
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$serial = serialize( $data );
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if ( function_exists( 'gzdeflate' ) ) {
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return gzdeflate( $serial );
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} else {
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return $serial;
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}
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}
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/**
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* Unserialize and, if necessary, decompress an object.
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* @param $serial string
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* @return mixed
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*/
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protected function unserialize( $serial ) {
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if ( function_exists( 'gzinflate' ) ) {
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$decomp = @gzinflate( $serial );
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if ( false !== $decomp ) {
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$serial = $decomp;
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}
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}
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$ret = unserialize( $serial );
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return $ret;
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}
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/**
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* Handle a DBQueryError which occurred during a write operation.
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* Ignore errors which are due to a read-only database, rethrow others.
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*/
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protected function handleWriteError( $exception ) {
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$db = $this->getDB();
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if ( !$db->wasReadOnlyError() ) {
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throw $exception;
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}
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try {
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$db->rollback();
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} catch ( DBQueryError $e ) {
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}
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wfDebug( __METHOD__ . ": ignoring query error\n" );
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$db->ignoreErrors( false );
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}
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}
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/**
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* Backwards compatibility alias
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*/
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class MediaWikiBagOStuff extends SqlBagOStuff { }
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/**
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* This is a wrapper for APC's shared memory functions
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*
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* @ingroup Cache
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*/
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class APCBagOStuff extends BagOStuff {
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public function get( $key ) {
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$val = apc_fetch( $key );
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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public function set( $key, $value, $exptime = 0 ) {
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apc_store( $key, serialize( $value ), $exptime );
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return true;
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}
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public function delete( $key, $time = 0 ) {
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apc_delete( $key );
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return true;
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}
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public function keys() {
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$info = apc_cache_info( 'user' );
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$list = $info['cache_list'];
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$keys = array();
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foreach ( $list as $entry ) {
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$keys[] = $entry['info'];
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}
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return $keys;
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}
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}
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/**
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* This is a wrapper for eAccelerator's shared memory functions.
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*
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* This is basically identical to the deceased Turck MMCache version,
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* mostly because eAccelerator is based on Turck MMCache.
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*
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* @ingroup Cache
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*/
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class eAccelBagOStuff extends BagOStuff {
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public function get( $key ) {
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$val = eaccelerator_get( $key );
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if ( is_string( $val ) ) {
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$val = unserialize( $val );
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}
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return $val;
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}
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public function set( $key, $value, $exptime = 0 ) {
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eaccelerator_put( $key, serialize( $value ), $exptime );
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return true;
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}
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public function delete( $key, $time = 0 ) {
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eaccelerator_rm( $key );
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return true;
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}
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public function lock( $key, $waitTimeout = 0 ) {
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eaccelerator_lock( $key );
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return true;
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}
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public function unlock( $key ) {
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eaccelerator_unlock( $key );
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return true;
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}
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}
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/**
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* Wrapper for XCache object caching functions; identical interface
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* to the APC wrapper
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*
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* @ingroup Cache
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*/
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class XCacheBagOStuff extends BagOStuff {
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/**
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* Get a value from the XCache object cache
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*
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* @param $key String: cache key
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* @return mixed
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*/
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public function get( $key ) {
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$val = xcache_get( $key );
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if ( is_string( $val ) )
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$val = unserialize( $val );
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return $val;
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}
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/**
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* Store a value in the XCache object cache
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*
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* @param $key String: cache key
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* @param $value Mixed: object to store
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* @param $expire Int: expiration time
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* @return bool
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*/
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public function set( $key, $value, $expire = 0 ) {
|
|
xcache_set( $key, serialize( $value ), $expire );
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Remove a value from the XCache object cache
|
|
*
|
|
* @param $key String: cache key
|
|
* @param $time Int: not used in this implementation
|
|
* @return bool
|
|
*/
|
|
public function delete( $key, $time = 0 ) {
|
|
xcache_unset( $key );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Cache that uses DBA as a backend.
|
|
* Slow due to the need to constantly open and close the file to avoid holding
|
|
* writer locks. Intended for development use only, as a memcached workalike
|
|
* for systems that don't have it.
|
|
*
|
|
* @ingroup Cache
|
|
*/
|
|
class DBABagOStuff extends BagOStuff {
|
|
var $mHandler, $mFile, $mReader, $mWriter, $mDisabled;
|
|
|
|
public function __construct( $dir = false ) {
|
|
global $wgDBAhandler;
|
|
if ( $dir === false ) {
|
|
global $wgTmpDirectory;
|
|
$dir = $wgTmpDirectory;
|
|
}
|
|
$this->mFile = "$dir/mw-cache-" . wfWikiID();
|
|
$this->mFile .= '.db';
|
|
wfDebug( __CLASS__ . ": using cache file {$this->mFile}\n" );
|
|
$this->mHandler = $wgDBAhandler;
|
|
}
|
|
|
|
/**
|
|
* Encode value and expiry for storage
|
|
*/
|
|
function encode( $value, $expiry ) {
|
|
# Convert to absolute time
|
|
$expiry = $this->convertExpiry( $expiry );
|
|
return sprintf( '%010u', intval( $expiry ) ) . ' ' . serialize( $value );
|
|
}
|
|
|
|
/**
|
|
* @return list containing value first and expiry second
|
|
*/
|
|
function decode( $blob ) {
|
|
if ( !is_string( $blob ) ) {
|
|
return array( null, 0 );
|
|
} else {
|
|
return array(
|
|
unserialize( substr( $blob, 11 ) ),
|
|
intval( substr( $blob, 0, 10 ) )
|
|
);
|
|
}
|
|
}
|
|
|
|
function getReader() {
|
|
if ( file_exists( $this->mFile ) ) {
|
|
$handle = dba_open( $this->mFile, 'rl', $this->mHandler );
|
|
} else {
|
|
$handle = $this->getWriter();
|
|
}
|
|
if ( !$handle ) {
|
|
wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
|
|
}
|
|
return $handle;
|
|
}
|
|
|
|
function getWriter() {
|
|
$handle = dba_open( $this->mFile, 'cl', $this->mHandler );
|
|
if ( !$handle ) {
|
|
wfDebug( "Unable to open DBA cache file {$this->mFile}\n" );
|
|
}
|
|
return $handle;
|
|
}
|
|
|
|
function get( $key ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__ . "($key)\n" );
|
|
$handle = $this->getReader();
|
|
if ( !$handle ) {
|
|
return null;
|
|
}
|
|
$val = dba_fetch( $key, $handle );
|
|
list( $val, $expiry ) = $this->decode( $val );
|
|
# Must close ASAP because locks are held
|
|
dba_close( $handle );
|
|
|
|
if ( !is_null( $val ) && $expiry && $expiry < time() ) {
|
|
# Key is expired, delete it
|
|
$handle = $this->getWriter();
|
|
dba_delete( $key, $handle );
|
|
dba_close( $handle );
|
|
wfDebug( __METHOD__ . ": $key expired\n" );
|
|
$val = null;
|
|
}
|
|
wfProfileOut( __METHOD__ );
|
|
return $val;
|
|
}
|
|
|
|
function set( $key, $value, $exptime = 0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__ . "($key)\n" );
|
|
$blob = $this->encode( $value, $exptime );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_replace( $key, $blob, $handle );
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function delete( $key, $time = 0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
wfDebug( __METHOD__ . "($key)\n" );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_delete( $key, $handle );
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function add( $key, $value, $exptime = 0 ) {
|
|
wfProfileIn( __METHOD__ );
|
|
$blob = $this->encode( $value, $exptime );
|
|
$handle = $this->getWriter();
|
|
if ( !$handle ) {
|
|
return false;
|
|
}
|
|
$ret = dba_insert( $key, $blob, $handle );
|
|
# Insert failed, check to see if it failed due to an expired key
|
|
if ( !$ret ) {
|
|
list( $value, $expiry ) = $this->decode( dba_fetch( $key, $handle ) );
|
|
if ( $expiry < time() ) {
|
|
# Yes expired, delete and try again
|
|
dba_delete( $key, $handle );
|
|
$ret = dba_insert( $key, $blob, $handle );
|
|
# This time if it failed then it will be handled by the caller like any other race
|
|
}
|
|
}
|
|
|
|
dba_close( $handle );
|
|
wfProfileOut( __METHOD__ );
|
|
return $ret;
|
|
}
|
|
|
|
function keys() {
|
|
$reader = $this->getReader();
|
|
$k1 = dba_firstkey( $reader );
|
|
if ( !$k1 ) {
|
|
return array();
|
|
}
|
|
$result[] = $k1;
|
|
while ( $key = dba_nextkey( $reader ) ) {
|
|
$result[] = $key;
|
|
}
|
|
return $result;
|
|
}
|
|
}
|