includes/SquidUpdate.php

   1 <?php
   2 /**
   3  * See deferred.txt
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  *
   9  * @package MediaWiki
  10  */
  11 class SquidUpdate {
  12         var $urlArr, $mMaxTitles;
  13
  14         function __construct( $urlArr = Array(), $maxTitles = false ) {
  15                 global $wgMaxSquidPurgeTitles;
  16                 if ( $maxTitles === false ) {
  17                         $this->mMaxTitles = $wgMaxSquidPurgeTitles;
  18                 } else {
  19                         $this->mMaxTitles = $maxTitles;
  20                 }
  21                 if ( count( $urlArr ) > $this->mMaxTitles ) {
  22                         $urlArr = array_slice( $urlArr, 0, $this->mMaxTitles );
  23                 }
  24                 $this->urlArr = $urlArr;
  25         }
  26
  27         /* static */ function newFromLinksTo( &$title ) {
  28                 $fname = 'SquidUpdate::newFromLinksTo';
  29                 wfProfileIn( $fname );
  30
  31                 # Get a list of URLs linking to this page
  32                 $dbr =& wfGetDB( DB_SLAVE );
  33                 $res = $dbr->select( array( 'links', 'page' ),
  34                         array( 'page_namespace', 'page_title' ),
  35                         array(
  36                                 'pl_namespace' => $title->getNamespace(),
  37                                 'pl_title'     => $title->getDbKey(),
  38                                 'pl_from=page_id' ),
  39                         $fname );
  40                 $blurlArr = $title->getSquidURLs();
  41                 if ( $dbr->numRows( $res ) <= $this->mMaxTitles ) {
  42                         while ( $BL = $dbr->fetchObject ( $res ) )
  43                         {
  44                                 $tobj = Title::makeTitle( $BL->page_namespace, $BL->page_title ) ;
  45                                 $blurlArr[] = $tobj->getInternalURL();
  46                         }
  47                 }
  48                 $dbr->freeResult ( $res ) ;
  49
  50                 wfProfileOut( $fname );
  51                 return new SquidUpdate( $blurlArr );
  52         }
  53
  54         /* static */ function newFromTitles( &$titles, $urlArr = array() ) {
  55                 global $wgMaxSquidPurgeTitles;
  56                 if ( count( $titles ) > $wgMaxSquidPurgeTitles ) {
  57                         $titles = array_slice( $titles, 0, $wgMaxSquidPurgeTitles );
  58                 }
  59                 foreach ( $titles as $title ) {
  60                         $urlArr[] = $title->getInternalURL();
  61                 }
  62                 return new SquidUpdate( $urlArr );
  63         }
  64
  65         /* static */ function newSimplePurge( &$title ) {
  66                 $urlArr = $title->getSquidURLs();
  67                 return new SquidUpdate( $urlArr );
  68         }
  69
  70         function doUpdate() {
  71                 SquidUpdate::purge( $this->urlArr );
  72         }
  73
  74         /* Purges a list of Squids defined in $wgSquidServers.
  75         $urlArr should contain the full URLs to purge as values
  76         (example: $urlArr[] = 'http://my.host/something')
  77         XXX report broken Squids per mail or log */
  78
  79         /* static */ function purge( $urlArr ) {
  80                 global $wgSquidServers, $wgHTCPMulticastAddress, $wgHTCPPort;
  81
  82                 /*if ( (@$wgSquidServers[0]) == 'echo' ) {
  83                         echo implode("<br />\n", $urlArr) . "<br />\n";
  84                         return;
  85                 }*/
  86
  87                 if ( $wgHTCPMulticastAddress && $wgHTCPPort )
  88                         SquidUpdate::HTCPPurge( $urlArr );
  89
  90                 $fname = 'SquidUpdate::purge';
  91                 wfProfileIn( $fname );
  92
  93                 $maxsocketspersquid = 8; //  socket cap per Squid
  94                 $urlspersocket = 400; // 400 seems to be a good tradeoff, opening a socket takes a while
  95                 $firsturl = SquidUpdate::expand( $urlArr[0] );
  96                 unset($urlArr[0]);
  97                 $urlArr = array_values($urlArr);
  98                 $sockspersq =  max(ceil(count($urlArr) / $urlspersocket ),1);
  99                 if ($sockspersq == 1) {
 100                         /* the most common case */
 101                         $urlspersocket = count($urlArr);
 102                 } else if ($sockspersq > $maxsocketspersquid ) {
 103                         $urlspersocket = ceil(count($urlArr) / $maxsocketspersquid);
 104                         $sockspersq = $maxsocketspersquid;
 105                 }
 106                 $totalsockets = count($wgSquidServers) * $sockspersq;
 107                 $sockets = Array();
 108
 109                 /* this sets up the sockets and tests the first socket for each server. */
 110                 for ($ss=0;$ss < count($wgSquidServers);$ss++) {
 111                         $failed = false;
 112                         $so = 0;
 113                         while ($so < $sockspersq && !$failed) {
 114                                 if ($so == 0) {
 115                                         /* first socket for this server, do the tests */
 116                                         @list($server, $port) = explode(':', $wgSquidServers[$ss]);
 117                                         if(!isset($port)) $port = 80;
 118                                         #$this->debug("Opening socket to $server:$port");
 119                                         $error = $errstr = false;
 120                                         $socket = @fsockopen($server, $port, $error, $errstr, 3);
 121                                         #$this->debug("\n");
 122                                         if (!$socket) {
 123                                                 $failed = true;
 124                                                 $totalsockets -= $sockspersq;
 125                                         } else {
 126                                                 $msg = 'PURGE ' . $firsturl . " HTTP/1.0\r\n".
 127                                                 "Connection: Keep-Alive\r\n\r\n";
 128                                                 #$this->debug($msg);
 129                                                 @fputs($socket,$msg);
 130                                                 #$this->debug("...");
 131                                                 $res = @fread($socket,512);
 132                                                 #$this->debug("\n");
 133                                                 /* Squid only returns http headers with 200 or 404 status,
 134                                                 if there's more returned something's wrong */
 135                                                 if (strlen($res) > 250) {
 136                                                         fclose($socket);
 137                                                         $failed = true;
 138                                                         $totalsockets -= $sockspersq;
 139                                                 } else {
 140                                                         @stream_set_blocking($socket,false);
 141                                                         $sockets[] = $socket;
 142                                                 }
 143                                         }
 144                                 } else {
 145                                         /* open the remaining sockets for this server */
 146                                         list($server, $port) = explode(':', $wgSquidServers[$ss]);
 147                                         if(!isset($port)) $port = 80;
 148                                         $sockets[$so+1] = @fsockopen($server, $port, $error, $errstr, 2);
 149                                         @stream_set_blocking($sockets[$so+1],false);
 150                                 }
 151                                 $so++;
 152                         }
 153                 }
 154
 155                 if ($urlspersocket > 0) {
 156                         /* now do the heavy lifting. The fread() relies on Squid returning only the headers */
 157                         for ($r=0;$r < $urlspersocket;$r++) {
 158                                 for ($s=0;$s < $totalsockets;$s++) {
 159                                         if($r != 0) {
 160                                                 $res = '';
 161                                                 $esc = 0;
 162                                                 while (strlen($res) < 100 && $esc < 200  ) {
 163                                                         $res .= @fread($sockets[$s],512);
 164                                                         $esc++;
 165                                                         usleep(20);
 166                                                 }
 167                                         }
 168                                         $urindex = $r + $urlspersocket * ($s - $sockspersq * floor($s / $sockspersq));
 169                                         $url = SquidUpdate::expand( $urlArr[$urindex] );
 170                                         $msg = 'PURGE ' . $url . " HTTP/1.0\r\n".
 171                                         "Connection: Keep-Alive\r\n\r\n";
 172                                         #$this->debug($msg);
 173                                         @fputs($sockets[$s],$msg);
 174                                         #$this->debug("\n");
 175                                 }
 176                         }
 177                 }
 178                 #$this->debug("Reading response...");
 179                 foreach ($sockets as $socket) {
 180                         $res = '';
 181                         $esc = 0;
 182                         while (strlen($res) < 100 && $esc < 200  ) {
 183                                 $res .= @fread($socket,1024);
 184                                 $esc++;
 185                                 usleep(20);
 186                         }
 187
 188                         @fclose($socket);
 189                 }
 190                 #$this->debug("\n");
 191                 wfProfileOut( $fname );
 192         }
 193
 194         /* static */ function HTCPPurge( $urlArr ) {
 195                 global $wgHTCPMulticastAddress, $wgHTCPMulticastTTL, $wgHTCPPort;
 196                 $fname = 'SquidUpdate::HTCPPurge';
 197                 wfProfileIn( $fname );
 198
 199                 $htcpOpCLR = 4;                 // HTCP CLR
 200
 201                 // FIXME PHP doesn't support these socket constants (include/linux/in.h)
 202                 if( !defined( "IPPROTO_IP" ) ) {
 203                         define( "IPPROTO_IP", 0 );
 204                         define( "IP_MULTICAST_LOOP", 34 );
 205                         define( "IP_MULTICAST_TTL", 33 );
 206                 }
 207
 208                 // pfsockopen doesn't work because we need set_sock_opt
 209                 $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
 210                 if ( $conn ) {
 211                         // Set socket options
 212                         socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
 213                         if ( $wgHTCPMulticastTTL != 1 )
 214                                 socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
 215                                         $wgHTCPMulticastTTL );
 216
 217                         foreach ( $urlArr as $url ) {
 218                                 if( !is_string( $url ) ) {
 219                                         wfDebugDieBacktrace( 'Bad purge URL' );
 220                                 }
 221                                 $url = SquidUpdate::expand( $url );
 222
 223                                 // Construct a minimal HTCP request diagram
 224                                 // as per RFC 2756
 225                                 // Opcode 'CLR', no response desired, no auth
 226                                 $htcpTransID = rand();
 227
 228                                 $htcpSpecifier = pack( 'na4na*na8n',
 229                                         4, 'HEAD', strlen( $url ), $url,
 230                                         8, 'HTTP/1.0', 0 );
 231
 232                                 $htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
 233                                 $htcpLen = 4 + $htcpDataLen + 2;
 234
 235                                 // Note! Squid gets the bit order of the first
 236                                 // word wrong, wrt the RFC. Apparently no other
 237                                 // implementation exists, so adapt to Squid
 238                                 $htcpPacket = pack( 'nxxnCxNxxa*n',
 239                                         $htcpLen, $htcpDataLen, $htcpOpCLR,
 240                                         $htcpTransID, $htcpSpecifier, 2);
 241
 242                                 // Send out
 243                                 wfDebug( "Purging URL $url via HTCP\n" );
 244                                 socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
 245                                         $wgHTCPMulticastAddress, $wgHTCPPort );
 246                         }
 247                 } else {
 248                         $errstr = socket_strerror( socket_last_error() );
 249                         wfDebug( "SquidUpdate::HTCPPurge(): Error opening UDP socket: $errstr\n" );
 250                 }
 251                 wfProfileOut( $fname );
 252         }
 253
 254         function debug( $text ) {
 255                 global $wgDebugSquid;
 256                 if ( $wgDebugSquid ) {
 257                         wfDebug( $text );
 258                 }
 259         }
 260
 261         /**
 262          * Expand local URLs to fully-qualified URLs using the internal protocol
 263          * and host defined in $wgInternalServer. Input that's already fully-
 264          * qualified will be passed through unchanged.
 265          *
 266          * This is used to generate purge URLs that may be either local to the
 267          * main wiki or include a non-native host, such as images hosted on a
 268          * second internal server.
 269          *
 270          * Client functions should not need to call this.
 271          *
 272          * @return string
 273          */
 274         static function expand( $url ) {
 275                 global $wgInternalServer;
 276                 if( $url != '' && $url{0} == '/' ) {
 277                         return $wgInternalServer . $url;
 278                 }
 279                 return $url;
 280         }
 281 }
 282 ?>