includes/SquidUpdate.php

   1 <?php
   2 /**
   3  * See deferred.txt
   4  * @file
   5  * @ingroup Cache
   6  */
   7
   8 /**
   9  * Handles purging appropriate Squid URLs given a title (or titles)
  10  * @ingroup Cache
  11  */
  12 class SquidUpdate {
  13         var $urlArr, $mMaxTitles;
  14
  15         function __construct( $urlArr = Array(), $maxTitles = false ) {
  16                 global $wgMaxSquidPurgeTitles;
  17                 if ( $maxTitles === false ) {
  18                         $this->mMaxTitles = $wgMaxSquidPurgeTitles;
  19                 } else {
  20                         $this->mMaxTitles = $maxTitles;
  21                 }
  22                 if ( count( $urlArr ) > $this->mMaxTitles ) {
  23                         $urlArr = array_slice( $urlArr, 0, $this->mMaxTitles );
  24                 }
  25                 $this->urlArr = $urlArr;
  26         }
  27
  28         static function newFromLinksTo( &$title ) {
  29                 global $wgMaxSquidPurgeTitles;
  30                 wfProfileIn( __METHOD__ );
  31
  32                 # Get a list of URLs linking to this page
  33                 $dbr = wfGetDB( DB_SLAVE );
  34                 $res = $dbr->select( array( 'links', 'page' ),
  35                         array( 'page_namespace', 'page_title' ),
  36                         array(
  37                                 'pl_namespace' => $title->getNamespace(),
  38                                 'pl_title'     => $title->getDBkey(),
  39                                 'pl_from=page_id' ),
  40                         __METHOD__ );
  41                 $blurlArr = $title->getSquidURLs();
  42                 if ( $dbr->numRows( $res ) <= $wgMaxSquidPurgeTitles ) {
  43                         foreach ( $res as $BL ) {
  44                                 $tobj = Title::makeTitle( $BL->page_namespace, $BL->page_title ) ;
  45                                 $blurlArr[] = $tobj->getInternalURL();
  46                         }
  47                 }
  48
  49                 wfProfileOut( __METHOD__ );
  50                 return new SquidUpdate( $blurlArr );
  51         }
  52
  53         /**
  54          * Create a SquidUpdate from an array of Title objects, or a TitleArray object
  55          */
  56         static function newFromTitles( $titles, $urlArr = array() ) {
  57                 global $wgMaxSquidPurgeTitles;
  58                 $i = 0;
  59                 foreach ( $titles as $title ) {
  60                         $urlArr[] = $title->getInternalURL();
  61                         if ( $i++ > $wgMaxSquidPurgeTitles ) {
  62                                 break;
  63                         }
  64                 }
  65                 return new SquidUpdate( $urlArr );
  66         }
  67
  68         static function newSimplePurge( &$title ) {
  69                 $urlArr = $title->getSquidURLs();
  70                 return new SquidUpdate( $urlArr );
  71         }
  72
  73         function doUpdate() {
  74                 SquidUpdate::purge( $this->urlArr );
  75         }
  76
  77         /* Purges a list of Squids defined in $wgSquidServers.
  78         $urlArr should contain the full URLs to purge as values
  79         (example: $urlArr[] = 'http://my.host/something')
  80         XXX report broken Squids per mail or log */
  81
  82         static function purge( $urlArr ) {
  83                 global $wgSquidServers, $wgHTCPMulticastAddress, $wgHTCPPort;
  84
  85                 /*if ( (@$wgSquidServers[0]) == 'echo' ) {
  86                         echo implode("<br />\n", $urlArr) . "<br />\n";
  87                         return;
  88                 }*/
  89
  90                 if( !$urlArr ) {
  91                         return;
  92                 }
  93
  94                 if ( $wgHTCPMulticastAddress && $wgHTCPPort ) {
  95                         return SquidUpdate::HTCPPurge( $urlArr );
  96                 }
  97
  98                 wfProfileIn( __METHOD__ );
  99
 100                 $maxSocketsPerSquid = 8; //  socket cap per Squid
 101                 $urlsPerSocket = 400; // 400 seems to be a good tradeoff, opening a socket takes a while
 102                 $socketsPerSquid = ceil( count( $urlArr ) / $urlsPerSocket );
 103                 if ( $socketsPerSquid > $maxSocketsPerSquid ) {
 104                         $socketsPerSquid = $maxSocketsPerSquid;
 105                 }
 106
 107                 $pool = new SquidPurgeClientPool;
 108                 $chunks = array_chunk( $urlArr, ceil( count( $urlArr ) / $socketsPerSquid ) );
 109                 foreach ( $wgSquidServers as $server ) {
 110                         foreach ( $chunks as $chunk ) {
 111                                 $client = new SquidPurgeClient( $server );
 112                                 foreach ( $chunk as $url ) {
 113                                         $client->queuePurge( $url );
 114                                 }
 115                                 $pool->addClient( $client );
 116                         }
 117                 }
 118                 $pool->run();
 119
 120                 wfProfileOut( __METHOD__ );
 121         }
 122
 123         static function HTCPPurge( $urlArr ) {
 124                 global $wgHTCPMulticastAddress, $wgHTCPMulticastTTL, $wgHTCPPort;
 125                 wfProfileIn( __METHOD__ );
 126
 127                 $htcpOpCLR = 4;                 // HTCP CLR
 128
 129                 // FIXME PHP doesn't support these socket constants (include/linux/in.h)
 130                 if( !defined( "IPPROTO_IP" ) ) {
 131                         define( "IPPROTO_IP", 0 );
 132                         define( "IP_MULTICAST_LOOP", 34 );
 133                         define( "IP_MULTICAST_TTL", 33 );
 134                 }
 135
 136                 // pfsockopen doesn't work because we need set_sock_opt
 137                 $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
 138                 if ( $conn ) {
 139                         // Set socket options
 140                         socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
 141                         if ( $wgHTCPMulticastTTL != 1 )
 142                                 socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
 143                                         $wgHTCPMulticastTTL );
 144
 145                         foreach ( $urlArr as $url ) {
 146                                 if( !is_string( $url ) ) {
 147                                         throw new MWException( 'Bad purge URL' );
 148                                 }
 149                                 $url = SquidUpdate::expand( $url );
 150
 151                                 // Construct a minimal HTCP request diagram
 152                                 // as per RFC 2756
 153                                 // Opcode 'CLR', no response desired, no auth
 154                                 $htcpTransID = rand();
 155
 156                                 $htcpSpecifier = pack( 'na4na*na8n',
 157                                         4, 'HEAD', strlen( $url ), $url,
 158                                         8, 'HTTP/1.0', 0 );
 159
 160                                 $htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
 161                                 $htcpLen = 4 + $htcpDataLen + 2;
 162
 163                                 // Note! Squid gets the bit order of the first
 164                                 // word wrong, wrt the RFC. Apparently no other
 165                                 // implementation exists, so adapt to Squid
 166                                 $htcpPacket = pack( 'nxxnCxNxxa*n',
 167                                         $htcpLen, $htcpDataLen, $htcpOpCLR,
 168                                         $htcpTransID, $htcpSpecifier, 2);
 169
 170                                 // Send out
 171                                 wfDebug( "Purging URL $url via HTCP\n" );
 172                                 socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
 173                                         $wgHTCPMulticastAddress, $wgHTCPPort );
 174                         }
 175                 } else {
 176                         $errstr = socket_strerror( socket_last_error() );
 177                         wfDebug( __METHOD__ . "(): Error opening UDP socket: $errstr\n" );
 178                 }
 179                 wfProfileOut( __METHOD__ );
 180         }
 181
 182         /**
 183          * Expand local URLs to fully-qualified URLs using the internal protocol
 184          * and host defined in $wgInternalServer. Input that's already fully-
 185          * qualified will be passed through unchanged.
 186          *
 187          * This is used to generate purge URLs that may be either local to the
 188          * main wiki or include a non-native host, such as images hosted on a
 189          * second internal server.
 190          *
 191          * Client functions should not need to call this.
 192          *
 193          * @return string
 194          */
 195         static function expand( $url ) {
 196                 global $wgInternalServer;
 197                 if( $url != '' && $url{0} == '/' ) {
 198                         return $wgInternalServer . $url;
 199                 }
 200                 return $url;
 201         }
 202 }