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468 lines (347 loc) · 10.5 KB
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<?php
/**
* Memcached drop in (uses Memcache)
*
* @package simple-cache
*/
// phpcs:ignoreFile
defined( 'ABSPATH' ) || exit;
// We need Memcache to continue
if ( ! class_exists( 'Memcache' ) ) {
return;
}
/**
* Copyright (C) 2016 Ryan Boren, Denis de Bernardy, Matt Martz
*/
if ( ! defined( 'WP_CACHE_KEY_SALT' ) ) {
define( 'WP_CACHE_KEY_SALT', '' );
}
function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->add( $key, $data, $group, $expire );
}
function wp_cache_incr( $key, $n = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->incr( $key, $n, $group );
}
function wp_cache_decr( $key, $n = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->decr( $key, $n, $group );
}
function wp_cache_close() {
global $wp_object_cache;
return $wp_object_cache->close();
}
function wp_cache_delete( $key, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->delete( $key, $group );
}
function wp_cache_flush() {
global $wp_object_cache;
return $wp_object_cache->flush();
}
function wp_cache_get( $key, $group = '', $force = false ) {
global $wp_object_cache;
return $wp_object_cache->get( $key, $group, $force );
}
function wp_cache_init() {
global $wp_object_cache;
$wp_object_cache = new WP_Object_Cache();
}
function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->replace( $key, $data, $group, $expire );
}
function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
if ( defined( 'WP_INSTALLING' ) == false ) {
return $wp_object_cache->set( $key, $data, $group, $expire );
} else {
return $wp_object_cache->delete( $key, $group );
}
}
function wp_cache_switch_to_blog( $blog_id ) {
global $wp_object_cache;
return $wp_object_cache->switch_to_blog( $blog_id );
}
function wp_cache_add_global_groups( $groups ) {
global $wp_object_cache;
$wp_object_cache->add_global_groups( $groups );
}
function wp_cache_add_non_persistent_groups( $groups ) {
global $wp_object_cache;
$wp_object_cache->add_non_persistent_groups( $groups );
}
class WP_Object_Cache {
var $global_groups = array();
var $no_mc_groups = array();
var $cache = array();
var $mc = array();
var $stats = array();
var $group_ops = array();
var $cache_enabled = true;
var $default_expiration = 0;
function add( $id, $data, $group = 'default', $expire = 0 ) {
$key = $this->key( $id, $group );
if ( is_object( $data ) ) {
$data = clone $data;
}
if ( in_array( $group, $this->no_mc_groups ) ) {
$this->cache[ $key ] = $data;
return true;
} elseif ( isset( $this->cache[ $key ] ) && $this->cache[ $key ] !== false ) {
return false;
}
$mc =& $this->get_mc( $group );
$expire = ( $expire == 0 ) ? $this->default_expiration : $expire;
$result = $mc->add( $key, $data, false, $expire );
if ( false !== $result ) {
@ ++$this->stats['add'];
$this->group_ops[ $group ][] = "add $id";
$this->cache[ $key ] = $data;
}
return $result;
}
function add_global_groups( $groups ) {
if ( ! is_array( $groups ) ) {
$groups = (array) $groups;
}
$this->global_groups = array_merge( $this->global_groups, $groups );
$this->global_groups = array_unique( $this->global_groups );
}
function add_non_persistent_groups( $groups ) {
if ( ! is_array( $groups ) ) {
$groups = (array) $groups;
}
$this->no_mc_groups = array_merge( $this->no_mc_groups, $groups );
$this->no_mc_groups = array_unique( $this->no_mc_groups );
}
function incr( $id, $n = 1, $group = 'default' ) {
$key = $this->key( $id, $group );
$mc =& $this->get_mc( $group );
$this->cache[ $key ] = $mc->increment( $key, $n );
return $this->cache[ $key ];
}
function decr( $id, $n = 1, $group = 'default' ) {
$key = $this->key( $id, $group );
$mc =& $this->get_mc( $group );
$this->cache[ $key ] = $mc->decrement( $key, $n );
return $this->cache[ $key ];
}
function close() {
foreach ( $this->mc as $bucket => $mc ) {
$mc->close();
}
}
function delete( $id, $group = 'default' ) {
$key = $this->key( $id, $group );
if ( in_array( $group, $this->no_mc_groups ) ) {
unset( $this->cache[ $key ] );
return true;
}
$mc =& $this->get_mc( $group );
$result = $mc->delete( $key );
@ ++$this->stats['delete'];
$this->group_ops[ $group ][] = "delete $id";
if ( false !== $result ) {
unset( $this->cache[ $key ] );
}
return $result;
}
function flush() {
$ret = true;
foreach ( array_keys( $this->mc ) as $group ) {
$ret &= $this->mc[ $group ]->flush();
}
return $ret;
}
function get( $id, $group = 'default', $force = false ) {
$key = $this->key( $id, $group );
$mc =& $this->get_mc( $group );
if ( isset( $this->cache[ $key ] ) && ( ! $force || in_array( $group, $this->no_mc_groups ) ) ) {
if ( is_object( $this->cache[ $key ] ) ) {
$value = clone $this->cache[ $key ];
} else {
$value = $this->cache[ $key ];
}
} elseif ( in_array( $group, $this->no_mc_groups ) ) {
$this->cache[ $key ] = $value = false;
} else {
$value = $mc->get( $key );
if ( null === $value ) {
$value = false;
}
$this->cache[ $key ] = $value;
}
@ ++$this->stats['get'];
$this->group_ops[ $group ][] = "get $id";
if ( 'checkthedatabaseplease' === $value ) {
unset( $this->cache[ $key ] );
$value = false;
}
return $value;
}
function get_multi( $groups ) {
/*
format: $get['group-name'] = array( 'key1', 'key2' );
*/
$return = array();
foreach ( $groups as $group => $ids ) {
$mc =& $this->get_mc( $group );
foreach ( $ids as $id ) {
$key = $this->key( $id, $group );
if ( isset( $this->cache[ $key ] ) ) {
if ( is_object( $this->cache[ $key ] ) ) {
$return[ $key ] = clone $this->cache[ $key ];
} else {
$return[ $key ] = $this->cache[ $key ];
}
continue;
} elseif ( in_array( $group, $this->no_mc_groups ) ) {
$return[ $key ] = false;
continue;
} else {
$return[ $key ] = $mc->get( $key );
}
}
if ( $to_get ) {
$vals = $mc->get_multi( $to_get );
$return = array_merge( $return, $vals );
}
}
@ ++$this->stats['get_multi'];
$this->group_ops[ $group ][] = "get_multi $id";
$this->cache = array_merge( $this->cache, $return );
return $return;
}
function key( $key, $group ) {
if ( empty( $group ) ) {
$group = 'default';
}
if ( false !== array_search( $group, $this->global_groups ) ) {
$prefix = $this->global_prefix;
} else {
$prefix = $this->blog_prefix;
}
return preg_replace( '/\s+/', '', WP_CACHE_KEY_SALT . "$prefix$group:$key" );
}
function replace( $id, $data, $group = 'default', $expire = 0 ) {
$key = $this->key( $id, $group );
$expire = ( $expire == 0 ) ? $this->default_expiration : $expire;
$mc =& $this->get_mc( $group );
if ( is_object( $data ) ) {
$data = clone $data;
}
$result = $mc->replace( $key, $data, false, $expire );
if ( false !== $result ) {
$this->cache[ $key ] = $data;
}
return $result;
}
function set( $id, $data, $group = 'default', $expire = 0 ) {
$key = $this->key( $id, $group );
if ( isset( $this->cache[ $key ] ) && ( 'checkthedatabaseplease' === $this->cache[ $key ] ) ) {
return false;
}
if ( is_object( $data ) ) {
$data = clone $data;
}
$this->cache[ $key ] = $data;
if ( in_array( $group, $this->no_mc_groups ) ) {
return true;
}
$expire = ( $expire == 0 ) ? $this->default_expiration : $expire;
$mc =& $this->get_mc( $group );
$result = $mc->set( $key, $data, false, $expire );
return $result;
}
function switch_to_blog( $blog_id ) {
global $table_prefix;
$blog_id = (int) $blog_id;
$this->blog_prefix = ( is_multisite() ? $blog_id : $table_prefix ) . ':';
}
function colorize_debug_line( $line ) {
$colors = array(
'get' => 'green',
'set' => 'purple',
'add' => 'blue',
'delete' => 'red',
);
$cmd = substr( $line, 0, strpos( $line, ' ' ) );
$cmd2 = "<span style='color:{$colors[$cmd]}'>$cmd</span>";
return $cmd2 . substr( $line, strlen( $cmd ) ) . "\n";
}
function stats() {
echo "<p>\n";
foreach ( $this->stats as $stat => $n ) {
echo "<strong>$stat</strong> $n";
echo "<br/>\n";
}
echo "</p>\n";
echo '<h3>Memcached:</h3>';
foreach ( $this->group_ops as $group => $ops ) {
if ( ! isset( $_GET['debug_queries'] ) && 500 < count( $ops ) ) {
$ops = array_slice( $ops, 0, 500 );
echo "<big>Too many to show! <a href='" . add_query_arg( 'debug_queries', 'true' ) . "'>Show them anyway</a>.</big>\n";
}
echo "<h4>$group commands</h4>";
echo "<pre>\n";
$lines = array();
foreach ( $ops as $op ) {
$lines[] = $this->colorize_debug_line( $op );
}
print_r( $lines );
echo "</pre>\n";
}
}
function &get_mc( $group ) {
if ( isset( $this->mc[ $group ] ) ) {
return $this->mc[ $group ];
}
return $this->mc['default'];
}
function failure_callback( $host, $port ) {
// error_log("Connection failure for $host:$port\n", 3, '/tmp/memcached.txt');
}
function __construct() {
global $memcached_servers;
if ( isset( $memcached_servers ) ) {
$buckets = $memcached_servers;
} else {
$buckets = array( '127.0.0.1:11211' );
}
reset( $buckets );
if ( is_int( key( $buckets ) ) ) {
$buckets = array( 'default' => $buckets );
}
foreach ( $buckets as $bucket => $servers ) {
$this->mc[ $bucket ] = new Memcache();
foreach ( $servers as $server ) {
if ( 'unix://' == substr( $server, 0, 7 ) ) {
$node = $server;
$port = 0;
} else {
list ( $node, $port ) = explode( ':', $server );
if ( ! $port ) {
$port = ini_get( 'memcache.default_port' );
}
$port = intval( $port );
if ( ! $port ) {
$port = 11211;
}
}
$this->mc[ $bucket ]->addServer( $node, $port, true, 1, 1, 15, true, array( $this, 'failure_callback' ) );
$this->mc[ $bucket ]->setCompressThreshold( 20000, 0.2 );
}
}
global $blog_id, $table_prefix;
$this->global_prefix = '';
$this->blog_prefix = '';
if ( function_exists( 'is_multisite' ) ) {
$this->global_prefix = ( is_multisite() || defined( 'CUSTOM_USER_TABLE' ) && defined( 'CUSTOM_USER_META_TABLE' ) ) ? '' : $table_prefix;
$this->blog_prefix = ( is_multisite() ? $blog_id : $table_prefix ) . ':';
}
$this->cache_hits =& $this->stats['get'];
$this->cache_misses =& $this->stats['add'];
}
}