includes/LinksUpdate.php

   1 <?php
   2 /**
   3  * See deferred.doc
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * @todo document
   9  * @package MediaWiki
  10  */
  11 class LinksUpdate {
  12
  13         /**#@+
  14          * @access private
  15          */
  16         var $mId, $mTitle;
  17         /**#@-*/
  18
  19         /**
  20          * Constructor
  21          * Initialize private variables
  22          * @param integer $id
  23          * @param string $title
  24          */
  25         function LinksUpdate( $id, $title ) {
  26                 $this->mId = $id;
  27                 $this->mTitle = $title;
  28         }
  29
  30         /**
  31          * Update link tables with outgoing links from an updated article
  32          * Relies on the 'link cache' to be filled out.
  33          */
  34
  35         function doUpdate() {
  36                 global $wgUseBetterLinksUpdate, $wgLinkCache, $wgDBtransactions;
  37                 global $wgEnablePersistentLC, $wgUseCategoryMagic;
  38
  39                 $fname = 'LinksUpdate::doUpdate';
  40                 wfProfileIn( $fname );
  41
  42                 $del = array();
  43                 $add = array();
  44
  45                 $dbw =& wfGetDB( DB_MASTER );
  46                 $links = $dbw->tableName( 'links' );
  47                 $brokenlinks = $dbw->tableName( 'brokenlinks' );
  48                 $imagelinks = $dbw->tableName( 'imagelinks' );
  49                 $categorylinks = $dbw->tableName( 'categorylinks' );
  50
  51                 #------------------------------------------------------------------------------
  52                 # Good links
  53
  54                 if ( $wgLinkCache->incrementalSetup( LINKCACHE_GOOD, $del, $add ) ) {
  55                         # Delete where necessary
  56                         if ( count( $del ) ) {
  57                                 $sql = "DELETE FROM $links WHERE l_from={$this->mId} AND l_to IN(".
  58                                         implode( ',', $del ) . ')';
  59                                 $dbw->query( $sql, $fname );
  60                         }
  61                 } else {
  62                         # Delete everything
  63                         $dbw->delete( 'links', array( 'l_from' => $this->mId ), $fname );
  64
  65                         # Get the addition list
  66                         $add = $wgLinkCache->getGoodLinks();
  67                 }
  68
  69                 # Do the insertion
  70                 if ( 0 != count( $add ) ) {
  71                         $arr=array();
  72                         foreach($add as $lt=>$lid)
  73                                 array_push( $arr, array(
  74                                                         'l_from' => $this->mId,
  75                                                         'l_to'   => $lid ) );
  76                         # The link cache was constructed without FOR UPDATE, so there may be collisions
  77                         # Ignoring for now, I'm not sure if that causes problems or not, but I'm fairly
  78                         # sure it's better than without IGNORE
  79                         $dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
  80                 }
  81
  82                 #------------------------------------------------------------------------------
  83                 # Bad links
  84
  85                 if ( $wgLinkCache->incrementalSetup( LINKCACHE_BAD, $del, $add ) ) {
  86                         # Delete where necessary
  87                         if ( count( $del ) ) {
  88                                 $sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId} AND bl_to IN(";
  89                                 $first = true;
  90                                 foreach( $del as $badTitle ) {
  91                                         if ( $first ) {
  92                                                 $first = false;
  93                                         } else {
  94                                                 $sql .= ',';
  95                                         }
  96                                         $sql .= $dbw->addQuotes( $badTitle );
  97                                 }
  98                                 $sql .= ')';
  99                                 $dbw->query( $sql, $fname );
 100                         }
 101                 } else {
 102                         # Delete all
 103                         $dbw->delete( 'brokenlinks', array( 'bl_from' => $this->mId ) );
 104
 105                         # Get addition list
 106                         $add = $wgLinkCache->getBadLinks();
 107                 }
 108
 109                 # Do additions
 110                 $sql = '';
 111                 if ( 0 != count ( $add ) ) {
 112                         $arr = array();
 113                         foreach( $add as $blt ) {
 114                                 array_push( $arr, array(
 115                                         'bl_from' => $this->mId,
 116                                         'bl_to'   => $blt ) );
 117                         }
 118                         $dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
 119                 }
 120
 121                 #------------------------------------------------------------------------------
 122                 # Image links
 123                 $sql = "DELETE FROM $imagelinks WHERE il_from='{$this->mId}'";
 124                 $dbw->query( $sql, $fname );
 125
 126                 # Get addition list
 127                 $add = $wgLinkCache->getImageLinks();
 128
 129                 # Do the insertion
 130                 $sql = '';
 131                 $image = NS_IMAGE;
 132                 if ( 0 != count ( $add ) ) {
 133                         $arr = array();
 134                         foreach ($add as $iname => $val ) {
 135                                 $nt = Title::makeTitle( $image, $iname );
 136                                 if( !$nt ) continue;
 137                                 $nt->invalidateCache();
 138                                 array_push( $arr, array(
 139                                         'il_from' => $this->mId,
 140                                         'il_to'   => $iname ) );
 141                         }
 142                         $dbw->insert('imagelinks', $arr, $fname, array('IGNORE'));
 143                 }
 144
 145                 #------------------------------------------------------------------------------
 146                 # Category links
 147                 if( $wgUseCategoryMagic ) {
 148                         $sql = "DELETE FROM $categorylinks WHERE cl_from='{$this->mId}'";
 149                         $dbw->query( $sql, $fname );
 150
 151                         # Get addition list
 152                         $add = $wgLinkCache->getCategoryLinks();
 153
 154                         # Do the insertion
 155                         $sql = '';
 156                         if ( 0 != count ( $add ) ) {
 157                                 $arr = array();
 158                                 foreach( $add as $cname => $sortkey ) {
 159                                         $nt = Title::makeTitle( NS_CATEGORY, $cname );
 160                                         if( !$nt ) continue;
 161                                         $nt->invalidateCache();
 162                                         array_push( $arr, array(
 163                                                 'cl_from'    => $this->mId,
 164                                                 'cl_to'      => $cname,
 165                                                 'cl_sortkey' => $sortkey ) );
 166                                 }
 167                                 $dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
 168                         }
 169                 }
 170
 171                 $this->fixBrokenLinks();
 172
 173                 wfProfileOut( $fname );
 174         }
 175
 176         /**
 177           * Link update which clears the previous entries and inserts new ones
 178           * May be slower or faster depending on level of lock contention and write speed of DB
 179           * Also useful where link table corruption needs to be repaired, e.g. in refreshLinks.php
 180          */
 181         function doDumbUpdate() {
 182                 global $wgLinkCache, $wgDBtransactions, $wgUseCategoryMagic;
 183                 $fname = 'LinksUpdate::doDumbUpdate';
 184                 wfProfileIn( $fname );
 185
 186
 187                 $dbw =& wfGetDB( DB_MASTER );
 188                 $links = $dbw->tableName( 'links' );
 189                 $brokenlinks = $dbw->tableName( 'brokenlinks' );
 190                 $imagelinks = $dbw->tableName( 'imagelinks' );
 191                 $categorylinks = $dbw->tableName( 'categorylinks' );
 192
 193                 $sql = "DELETE FROM $links WHERE l_from={$this->mId}";
 194                 $dbw->query( $sql, $fname );
 195
 196                 $a = $wgLinkCache->getGoodLinks();
 197                 if ( 0 != count( $a ) ) {
 198                         $arr = array();
 199                         foreach( $a as $lt => $lid ) {
 200                                 array_push( $arr, array(
 201                                         'l_from' => $this->mId,
 202                                         'l_to'   => $lid ) );
 203                         }
 204                         $dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
 205                 }
 206
 207                 $sql = "DELETE FROM $brokenlinks WHERE bl_from={$this->mId}";
 208                 $dbw->query( $sql, $fname );
 209
 210                 $a = $wgLinkCache->getBadLinks();
 211                 if ( 0 != count ( $a ) ) {
 212                         $arr = array();
 213                         foreach( $a as $blt ) {
 214                                 array_push($arr,array(
 215                                         'bl_from' => $this->mId,
 216                                         'bl_to'   => $blt));
 217                         }
 218                         $dbw->insert( 'brokenlinks', $arr, $fname, array( 'IGNORE' ) );
 219                 }
 220
 221                 $sql = "DELETE FROM $imagelinks WHERE il_from={$this->mId}";
 222                 $dbw->query( $sql, $fname );
 223
 224                 $a = $wgLinkCache->getImageLinks();
 225                 $sql = '';
 226                 if ( 0 != count ( $a ) ) {
 227                         $arr = array();
 228                         foreach( $a as $iname => $val )
 229                                 array_push( $arr, array(
 230                                         'il_from' => $this->mId,
 231                                         'il_to'   => $iname ) );
 232                         $dbw->insert( 'imagelinks', $arr, $fname, array( 'IGNORE' ) );
 233                 }
 234
 235                 if( $wgUseCategoryMagic ) {
 236                         $sql = "DELETE FROM $categorylinks WHERE cl_from='{$this->mId}'";
 237                         $dbw->query( $sql, $fname );
 238
 239                         # Get addition list
 240                         $add = $wgLinkCache->getCategoryLinks();
 241
 242                         # Do the insertion
 243                         $sql = '';
 244                         if ( 0 != count ( $add ) ) {
 245                                 $arr = array();
 246                                 foreach( $add as $cname => $sortkey ) {
 247                                         # FIXME: Change all this to avoid unnecessary duplication
 248                                         $nt = Title::makeTitle( NS_CATEGORY, $cname );
 249                                         if( !$nt ) continue;
 250                                         $nt->invalidateCache();
 251                                         array_push( $arr, array(
 252                                                 'cl_from'    => $this->mId,
 253                                                 'cl_to'      => $cname,
 254                                                 'cl_sortkey' => $sortkey ) );
 255                                 }
 256                                 $dbw->insert( 'categorylinks', $arr, $fname, array( 'IGNORE' ) );
 257                         }
 258                 }
 259                 $this->fixBrokenLinks();
 260                 wfProfileOut( $fname );
 261         }
 262
 263         /**
 264          * Update any brokenlinks *to* this page
 265          * Call for a newly created page, or just to make sure state is consistent
 266          */
 267         function fixBrokenLinks() {
 268                 $fname = 'LinksUpdate::fixBrokenLinks';
 269
 270                 $dbw =& wfGetDB( DB_MASTER );
 271                 $page = $dbw->tableName( 'page' );
 272                 $links = $dbw->tableName( 'links' );
 273
 274                 $res = $dbw->select( 'brokenlinks', array( 'bl_from' ), array( 'bl_to' => $this->mTitle ),
 275                   $fname, 'FOR UPDATE' );
 276                 if ( 0 == $dbw->numRows( $res ) ) { return; }
 277
 278                 $arr=array();
 279                 $now = $dbw->timestamp();
 280                 $sql2 = "UPDATE $page SET page_touched='{$now}' WHERE page_id IN (";
 281                 $first = true;
 282                 while ( $row = $dbw->fetchObject( $res ) ) {
 283                         if ( ! $first ) { $sql2 .= ","; }
 284                         $first = false;
 285                         array_push( $arr, array(
 286                                 'l_from' => $row->bl_from,
 287                                 'l_to'   => $this->mId ) );
 288                         $sql2 .= $row->bl_from;
 289                 }
 290                 $sql2 .= ')';
 291
 292                 # Ignore errors. If a link existed in both the brokenlinks table and the links
 293                 # table, that's an error which can be fixed at this stage by simply ignoring collisions
 294                 $dbw->insert( 'links', $arr, $fname, array( 'IGNORE' ) );
 295                 $dbw->query( $sql2, $fname );
 296                 $dbw->delete( 'brokenlinks', array( 'bl_to' => $this->mTitle ), $fname );
 297         }
 298 }
 299 ?>