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<?php
/**
* See deferred.txt
* @file
* @ingroup Cache
*/
/**
* Handles purging appropriate Squid URLs given a title (or titles)
* @ingroup Cache
*/
class SquidUpdate {
var $urlArr, $mMaxTitles;
function __construct( $urlArr = Array(), $maxTitles = false ) {
global $wgMaxSquidPurgeTitles;
if ( $maxTitles === false ) {
$this->mMaxTitles = $wgMaxSquidPurgeTitles;
} else {
$this->mMaxTitles = $maxTitles;
}
if ( count( $urlArr ) > $this->mMaxTitles ) {
$urlArr = array_slice( $urlArr, 0, $this->mMaxTitles );
}
$this->urlArr = $urlArr;
}
static function newFromLinksTo( &$title ) {
global $wgMaxSquidPurgeTitles;
wfProfileIn( __METHOD__ );
# Get a list of URLs linking to this page
$dbr = wfGetDB( DB_SLAVE );
$res = $dbr->select( array( 'links', 'page' ),
array( 'page_namespace', 'page_title' ),
array(
'pl_namespace' => $title->getNamespace(),
'pl_title' => $title->getDBkey(),
'pl_from=page_id' ),
__METHOD__ );
$blurlArr = $title->getSquidURLs();
if ( $dbr->numRows( $res ) <= $wgMaxSquidPurgeTitles ) {
foreach ( $res as $BL ) {
$tobj = Title::makeTitle( $BL->page_namespace, $BL->page_title ) ;
$blurlArr[] = $tobj->getInternalURL();
}
}
wfProfileOut( __METHOD__ );
return new SquidUpdate( $blurlArr );
}
/**
* Create a SquidUpdate from an array of Title objects, or a TitleArray object
*/
static function newFromTitles( $titles, $urlArr = array() ) {
global $wgMaxSquidPurgeTitles;
$i = 0;
foreach ( $titles as $title ) {
$urlArr[] = $title->getInternalURL();
if ( $i++ > $wgMaxSquidPurgeTitles ) {
break;
}
}
return new SquidUpdate( $urlArr );
}
static function newSimplePurge( &$title ) {
$urlArr = $title->getSquidURLs();
return new SquidUpdate( $urlArr );
}
function doUpdate() {
SquidUpdate::purge( $this->urlArr );
}
/* Purges a list of Squids defined in $wgSquidServers.
$urlArr should contain the full URLs to purge as values
(example: $urlArr[] = 'http://my.host/something')
XXX report broken Squids per mail or log */
static function purge( $urlArr ) {
global $wgSquidServers, $wgHTCPMulticastAddress, $wgHTCPPort;
/*if ( (@$wgSquidServers[0]) == 'echo' ) {
echo implode("<br />\n", $urlArr) . "<br />\n";
return;
}*/
if( !$urlArr ) {
return;
}
if ( $wgHTCPMulticastAddress && $wgHTCPPort ) {
return SquidUpdate::HTCPPurge( $urlArr );
}
wfProfileIn( __METHOD__ );
$maxSocketsPerSquid = 8; // socket cap per Squid
$urlsPerSocket = 400; // 400 seems to be a good tradeoff, opening a socket takes a while
$socketsPerSquid = ceil( count( $urlArr ) / $urlsPerSocket );
if ( $socketsPerSquid > $maxSocketsPerSquid ) {
$socketsPerSquid = $maxSocketsPerSquid;
}
$pool = new SquidPurgeClientPool;
$chunks = array_chunk( $urlArr, ceil( count( $urlArr ) / $socketsPerSquid ) );
foreach ( $wgSquidServers as $server ) {
foreach ( $chunks as $chunk ) {
$client = new SquidPurgeClient( $server );
foreach ( $chunk as $url ) {
$client->queuePurge( $url );
}
$pool->addClient( $client );
}
}
$pool->run();
wfProfileOut( __METHOD__ );
}
static function HTCPPurge( $urlArr ) {
global $wgHTCPMulticastAddress, $wgHTCPMulticastTTL, $wgHTCPPort;
wfProfileIn( __METHOD__ );
$htcpOpCLR = 4; // HTCP CLR
// FIXME PHP doesn't support these socket constants (include/linux/in.h)
if( !defined( "IPPROTO_IP" ) ) {
define( "IPPROTO_IP", 0 );
define( "IP_MULTICAST_LOOP", 34 );
define( "IP_MULTICAST_TTL", 33 );
}
// pfsockopen doesn't work because we need set_sock_opt
$conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
if ( $conn ) {
// Set socket options
socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
if ( $wgHTCPMulticastTTL != 1 )
socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
$wgHTCPMulticastTTL );
foreach ( $urlArr as $url ) {
if( !is_string( $url ) ) {
throw new MWException( 'Bad purge URL' );
}
$url = SquidUpdate::expand( $url );
// Construct a minimal HTCP request diagram
// as per RFC 2756
// Opcode 'CLR', no response desired, no auth
$htcpTransID = rand();
$htcpSpecifier = pack( 'na4na*na8n',
4, 'HEAD', strlen( $url ), $url,
8, 'HTTP/1.0', 0 );
$htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
$htcpLen = 4 + $htcpDataLen + 2;
// Note! Squid gets the bit order of the first
// word wrong, wrt the RFC. Apparently no other
// implementation exists, so adapt to Squid
$htcpPacket = pack( 'nxxnCxNxxa*n',
$htcpLen, $htcpDataLen, $htcpOpCLR,
$htcpTransID, $htcpSpecifier, 2);
// Send out
wfDebug( "Purging URL $url via HTCP\n" );
socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
$wgHTCPMulticastAddress, $wgHTCPPort );
}
} else {
$errstr = socket_strerror( socket_last_error() );
wfDebug( __METHOD__ . "(): Error opening UDP socket: $errstr\n" );
}
wfProfileOut( __METHOD__ );
}
/**
* Expand local URLs to fully-qualified URLs using the internal protocol
* and host defined in $wgInternalServer. Input that's already fully-
* qualified will be passed through unchanged.
*
* This is used to generate purge URLs that may be either local to the
* main wiki or include a non-native host, such as images hosted on a
* second internal server.
*
* Client functions should not need to call this.
*
* @return string
*/
static function expand( $url ) {
global $wgInternalServer;
if( $url != '' && $url{0} == '/' ) {
return $wgInternalServer . $url;
}
return $url;
}
}
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