includes/cache/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         /**
  29          * @param $title Title
  30          *
  31          * @return SquidUpdate
  32          */
  33         static function newFromLinksTo( &$title ) {
  34                 global $wgMaxSquidPurgeTitles;
  35                 wfProfileIn( __METHOD__ );
  36
  37                 # Get a list of URLs linking to this page
  38                 $dbr = wfGetDB( DB_SLAVE );
  39                 $res = $dbr->select( array( 'links', 'page' ),
  40                         array( 'page_namespace', 'page_title' ),
  41                         array(
  42                                 'pl_namespace' => $title->getNamespace(),
  43                                 'pl_title'     => $title->getDBkey(),
  44                                 'pl_from=page_id' ),
  45                         __METHOD__ );
  46                 $blurlArr = $title->getSquidURLs();
  47                 if ( $dbr->numRows( $res ) <= $wgMaxSquidPurgeTitles ) {
  48                         foreach ( $res as $BL ) {
  49                                 $tobj = Title::makeTitle( $BL->page_namespace, $BL->page_title ) ;
  50                                 $blurlArr[] = $tobj->getInternalURL();
  51                         }
  52                 }
  53
  54                 wfProfileOut( __METHOD__ );
  55                 return new SquidUpdate( $blurlArr );
  56         }
  57
  58         /**
  59          * Create a SquidUpdate from an array of Title objects, or a TitleArray object
  60          *
  61          * @param $titles array
  62          * @param $urlArr array
  63          *
  64          * @return SquidUpdate
  65          */
  66         static function newFromTitles( $titles, $urlArr = array() ) {
  67                 global $wgMaxSquidPurgeTitles;
  68                 $i = 0;
  69                 foreach ( $titles as $title ) {
  70                         $urlArr[] = $title->getInternalURL();
  71                         if ( $i++ > $wgMaxSquidPurgeTitles ) {
  72                                 break;
  73                         }
  74                 }
  75                 return new SquidUpdate( $urlArr );
  76         }
  77
  78         /**
  79          * @param $title Title
  80          *
  81          * @return SquidUpdate
  82          */
  83         static function newSimplePurge( &$title ) {
  84                 $urlArr = $title->getSquidURLs();
  85                 return new SquidUpdate( $urlArr );
  86         }
  87
  88         function doUpdate() {
  89                 SquidUpdate::purge( $this->urlArr );
  90         }
  91
  92         /**
  93          * Purges a list of Squids defined in $wgSquidServers.
  94          * $urlArr should contain the full URLs to purge as values
  95          * (example: $urlArr[] = 'http://my.host/something')
  96          * XXX report broken Squids per mail or log
  97          *
  98          * @param $urlArr array
  99          * @return void
 100          */
 101         static function purge( $urlArr ) {
 102                 global $wgSquidServers, $wgHTCPMulticastAddress, $wgHTCPPort;
 103
 104                 /*if ( (@$wgSquidServers[0]) == 'echo' ) {
 105                         echo implode("<br />\n", $urlArr) . "<br />\n";
 106                         return;
 107                 }*/
 108
 109                 if( !$urlArr ) {
 110                         return;
 111                 }
 112
 113                 if ( $wgHTCPMulticastAddress && $wgHTCPPort ) {
 114                         return SquidUpdate::HTCPPurge( $urlArr );
 115                 }
 116
 117                 wfProfileIn( __METHOD__ );
 118
 119                 $maxSocketsPerSquid = 8; //  socket cap per Squid
 120                 $urlsPerSocket = 400; // 400 seems to be a good tradeoff, opening a socket takes a while
 121                 $socketsPerSquid = ceil( count( $urlArr ) / $urlsPerSocket );
 122                 if ( $socketsPerSquid > $maxSocketsPerSquid ) {
 123                         $socketsPerSquid = $maxSocketsPerSquid;
 124                 }
 125
 126                 $pool = new SquidPurgeClientPool;
 127                 $chunks = array_chunk( $urlArr, ceil( count( $urlArr ) / $socketsPerSquid ) );
 128                 foreach ( $wgSquidServers as $server ) {
 129                         foreach ( $chunks as $chunk ) {
 130                                 $client = new SquidPurgeClient( $server );
 131                                 foreach ( $chunk as $url ) {
 132                                         $client->queuePurge( $url );
 133                                 }
 134                                 $pool->addClient( $client );
 135                         }
 136                 }
 137                 $pool->run();
 138
 139                 wfProfileOut( __METHOD__ );
 140         }
 141
 142         static function HTCPPurge( $urlArr ) {
 143                 global $wgHTCPMulticastAddress, $wgHTCPMulticastTTL, $wgHTCPPort;
 144                 wfProfileIn( __METHOD__ );
 145
 146                 $htcpOpCLR = 4; // HTCP CLR
 147
 148                 // @todo FIXME: PHP doesn't support these socket constants (include/linux/in.h)
 149                 if( !defined( "IPPROTO_IP" ) ) {
 150                         define( "IPPROTO_IP", 0 );
 151                         define( "IP_MULTICAST_LOOP", 34 );
 152                         define( "IP_MULTICAST_TTL", 33 );
 153                 }
 154
 155                 // pfsockopen doesn't work because we need set_sock_opt
 156                 $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
 157                 if ( $conn ) {
 158                         // Set socket options
 159                         socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
 160                         if ( $wgHTCPMulticastTTL != 1 )
 161                                 socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
 162                                         $wgHTCPMulticastTTL );
 163
 164                         foreach ( $urlArr as $url ) {
 165                                 if( !is_string( $url ) ) {
 166                                         throw new MWException( 'Bad purge URL' );
 167                                 }
 168                                 $url = SquidUpdate::expand( $url );
 169
 170                                 // Construct a minimal HTCP request diagram
 171                                 // as per RFC 2756
 172                                 // Opcode 'CLR', no response desired, no auth
 173                                 $htcpTransID = rand();
 174
 175                                 $htcpSpecifier = pack( 'na4na*na8n',
 176                                         4, 'HEAD', strlen( $url ), $url,
 177                                         8, 'HTTP/1.0', 0 );
 178
 179                                 $htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
 180                                 $htcpLen = 4 + $htcpDataLen + 2;
 181
 182                                 // Note! Squid gets the bit order of the first
 183                                 // word wrong, wrt the RFC. Apparently no other
 184                                 // implementation exists, so adapt to Squid
 185                                 $htcpPacket = pack( 'nxxnCxNxxa*n',
 186                                         $htcpLen, $htcpDataLen, $htcpOpCLR,
 187                                         $htcpTransID, $htcpSpecifier, 2);
 188
 189                                 // Send out
 190                                 wfDebug( "Purging URL $url via HTCP\n" );
 191                                 socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
 192                                         $wgHTCPMulticastAddress, $wgHTCPPort );
 193                         }
 194                 } else {
 195                         $errstr = socket_strerror( socket_last_error() );
 196                         wfDebug( __METHOD__ . "(): Error opening UDP socket: $errstr\n" );
 197                 }
 198                 wfProfileOut( __METHOD__ );
 199         }
 200
 201         /**
 202          * Expand local URLs to fully-qualified URLs using the internal protocol
 203          * and host defined in $wgInternalServer. Input that's already fully-
 204          * qualified will be passed through unchanged.
 205          *
 206          * This is used to generate purge URLs that may be either local to the
 207          * main wiki or include a non-native host, such as images hosted on a
 208          * second internal server.
 209          *
 210          * Client functions should not need to call this.
 211          *
 212          * @param $url string
 213          *
 214          * @return string
 215          */
 216         static function expand( $url ) {
 217                 global $wgInternalServer, $wgServer;
 218                 $server = $wgInternalServer !== false ? $wgInternalServer : $wgServer;
 219                 if( $url !== '' && $url[0] == '/' ) {
 220                         return $server . $url;
 221                 }
 222                 return $url;
 223         }
 224 }