106 lines
2.4 KiB
PHP
106 lines
2.4 KiB
PHP
<?php
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# Object for fast lookup of IP blocks
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# Represents a memcached value, and in some sense, the entire ipblocks table
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class BlockCache
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{
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var $mData = false, $mMemcKey;
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function BlockCache( $deferLoad = false, $dbName = '' ) {
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global $wgDBname;
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if ( $dbName == '' ) {
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$dbName = $wgDBname;
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}
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$this->mMemcKey = $dbName.':ipblocks';
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if ( !$deferLoad ) {
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$this->load();
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}
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}
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# Load the blocks from the database and save them to memcached
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function loadFromDB() {
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global $wgUseMemCached, $wgMemc;
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$this->mData = array();
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# Selecting FOR UPDATE is a convenient way to serialise the memcached and DB operations,
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# which is necessary even though we don't update the DB
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if ( $wgUseMemCached ) {
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Block::enumBlocks( 'wfBlockCacheInsert', '', EB_FOR_UPDATE );
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$wgMemc->set( $this->mMemcKey, $this->mData, 0 );
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} else {
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Block::enumBlocks( 'wfBlockCacheInsert', '' );
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}
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}
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# Load the cache from memcached or, if that's not possible, from the DB
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function load() {
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global $wgUseMemCached, $wgMemc;
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if ( $this->mData === false) {
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# Try memcached
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if ( $wgUseMemCached ) {
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$this->mData = $wgMemc->get( $this->mMemcKey );
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}
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if ( !is_array( $this->mData ) ) {
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$this->loadFromDB();
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}
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}
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}
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# Add a block to the cache
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function insert( &$block ) {
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if ( $block->mUser == 0 ) {
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$nb = $block->getNetworkBits();
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$ipint = $block->getIntegerAddr();
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$index = $ipint >> ( 32 - $nb );
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if ( !array_key_exists( $nb, $this->mData ) ) {
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$this->mData[$nb] = array();
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}
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$this->mData[$nb][$index] = 1;
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}
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}
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# Find out if a given IP address is blocked
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function get( $ip ) {
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$this->load();
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$ipint = ip2long( $ip );
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$blocked = false;
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foreach ( $this->mData as $networkBits => $blockInts ) {
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if ( array_key_exists( $ipint >> ( 32 - $networkBits ), $blockInts ) ) {
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$blocked = true;
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break;
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}
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}
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if ( $blocked ) {
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# Clear low order bits
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if ( $networkBits != 32 ) {
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$ip .= '/'.$networkBits;
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$ip = Block::normaliseRange( $ip );
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}
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$block = new Block();
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$block->load( $ip );
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} else {
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$block = false;
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}
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return $block;
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}
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# Clear the local cache
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# There was once a clear() to clear memcached too, but I deleted it
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function clearLocal() {
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$this->mData = false;
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}
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}
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function wfBlockCacheInsert( $block, $tag ) {
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global $wgBlockCache;
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$wgBlockCache->insert( $block );
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}
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