includes/QueryPage.php

   1 <?php
   2 /**
   3  * Contain a class for special pages
   4  */
   5
   6 /**
   7  * List of query page classes and their associated special pages,
   8  * for periodic updates.
   9  *
  10  * DO NOT CHANGE THIS LIST without testing that
  11  * maintenance/updateSpecialPages.php still works.
  12  */
  13 global $wgQueryPages; // not redundant
  14 $wgQueryPages = array(
  15 //         QueryPage subclass           Special page name         Limit (false for none, none for the default)
  16 //----------------------------------------------------------------------------
  17         array( 'AncientPagesPage',              'Ancientpages'                  ),
  18         array( 'BrokenRedirectsPage',           'BrokenRedirects'               ),
  19         array( 'DeadendPagesPage',              'Deadendpages'                  ),
  20         array( 'DisambiguationsPage',           'Disambiguations'               ),
  21         array( 'DoubleRedirectsPage',           'DoubleRedirects'               ),
  22         array( 'ListredirectsPage',             'Listredirects'                                 ),
  23         array( 'LonelyPagesPage',               'Lonelypages'                   ),
  24         array( 'LongPagesPage',                 'Longpages'                     ),
  25         array( 'MostcategoriesPage',            'Mostcategories'                ),
  26         array( 'MostimagesPage',                'Mostimages'                    ),
  27         array( 'MostlinkedCategoriesPage',      'Mostlinkedcategories'          ),
  28         array( 'MostlinkedPage',                'Mostlinked'                    ),
  29         array( 'MostrevisionsPage',             'Mostrevisions'                 ),
  30         array( 'FewestrevisionsPage',           'Fewestrevisions'               ),
  31         array( 'NewPagesPage',                  'Newpages'                      ),
  32         array( 'ShortPagesPage',                'Shortpages'                    ),
  33         array( 'UncategorizedCategoriesPage',   'Uncategorizedcategories'       ),
  34         array( 'UncategorizedPagesPage',        'Uncategorizedpages'            ),
  35         array( 'UncategorizedImagesPage',       'Uncategorizedimages'                   ),
  36         array( 'UnusedCategoriesPage',          'Unusedcategories'              ),
  37         array( 'UnusedimagesPage',              'Unusedimages'                  ),
  38         array( 'WantedCategoriesPage',          'Wantedcategories'              ),
  39         array( 'WantedPagesPage',               'Wantedpages'                   ),
  40         array( 'UnwatchedPagesPage',            'Unwatchedpages'                ),
  41         array( 'UnusedtemplatesPage',           'Unusedtemplates'                               ),
  42         array( 'WithoutInterwikiPage',                  'Withoutinterwiki'                              ),
  43 );
  44 wfRunHooks( 'wgQueryPages', array( &$wgQueryPages ) );
  45
  46 global $wgDisableCounters;
  47 if ( !$wgDisableCounters )
  48         $wgQueryPages[] = array( 'PopularPagesPage',            'Popularpages'          );
  49
  50
  51 /**
  52  * This is a class for doing query pages; since they're almost all the same,
  53  * we factor out some of the functionality into a superclass, and let
  54  * subclasses derive from it.
  55  * @addtogroup SpecialPage
  56  */
  57 class QueryPage {
  58         /**
  59          * Whether or not we want plain listoutput rather than an ordered list
  60          *
  61          * @var bool
  62          */
  63         var $listoutput = false;
  64
  65         /**
  66          * The offset and limit in use, as passed to the query() function
  67          *
  68          * @var integer
  69          */
  70         var $offset = 0;
  71         var $limit = 0;
  72
  73         /**
  74          * A mutator for $this->listoutput;
  75          *
  76          * @param bool $bool
  77          */
  78         function setListoutput( $bool ) {
  79                 $this->listoutput = $bool;
  80         }
  81
  82         /**
  83          * Subclasses return their name here. Make sure the name is also
  84          * specified in SpecialPage.php and in Language.php as a language message
  85          * param.
  86          */
  87         function getName() {
  88                 return '';
  89         }
  90
  91         /**
  92          * Return title object representing this page
  93          *
  94          * @return Title
  95          */
  96         function getTitle() {
  97                 return SpecialPage::getTitleFor( $this->getName() );
  98         }
  99
 100         /**
 101          * Subclasses return an SQL query here.
 102          *
 103          * Note that the query itself should return the following four columns:
 104          * 'type' (your special page's name), 'namespace', 'title', and 'value'
 105          * *in that order*. 'value' is used for sorting.
 106          *
 107          * These may be stored in the querycache table for expensive queries,
 108          * and that cached data will be returned sometimes, so the presence of
 109          * extra fields can't be relied upon. The cached 'value' column will be
 110          * an integer; non-numeric values are useful only for sorting the initial
 111          * query.
 112          *
 113          * Don't include an ORDER or LIMIT clause, this will be added.
 114          */
 115         function getSQL() {
 116                 return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
 117         }
 118
 119         /**
 120          * Override to sort by increasing values
 121          */
 122         function sortDescending() {
 123                 return true;
 124         }
 125
 126         function getOrder() {
 127                 return ' ORDER BY value ' .
 128                         ($this->sortDescending() ? 'DESC' : '');
 129         }
 130
 131         /**
 132          * Is this query expensive (for some definition of expensive)? Then we
 133          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 134          * pages to be declared expensive. Some query pages are always expensive.
 135          */
 136         function isExpensive( ) {
 137                 global $wgDisableQueryPages;
 138                 return $wgDisableQueryPages;
 139         }
 140
 141         /**
 142          * Whether or not the output of the page in question is retrived from
 143          * the database cache.
 144          *
 145          * @return bool
 146          */
 147         function isCached() {
 148                 global $wgMiserMode;
 149
 150                 return $this->isExpensive() && $wgMiserMode;
 151         }
 152
 153         /**
 154          * Sometime we dont want to build rss / atom feeds.
 155          */
 156         function isSyndicated() {
 157                 return true;
 158         }
 159
 160         /**
 161          * Formats the results of the query for display. The skin is the current
 162          * skin; you can use it for making links. The result is a single row of
 163          * result data. You should be able to grab SQL results off of it.
 164          * If the function return "false", the line output will be skipped.
 165          */
 166         function formatResult( $skin, $result ) {
 167                 return '';
 168         }
 169
 170         /**
 171          * The content returned by this function will be output before any result
 172          */
 173         function getPageHeader( ) {
 174                 return '';
 175         }
 176
 177         /**
 178          * If using extra form wheely-dealies, return a set of parameters here
 179          * as an associative array. They will be encoded and added to the paging
 180          * links (prev/next/lengths).
 181          * @return array
 182          */
 183         function linkParameters() {
 184                 return array();
 185         }
 186
 187         /**
 188          * Some special pages (for example SpecialListusers) might not return the
 189          * current object formatted, but return the previous one instead.
 190          * Setting this to return true, will call one more time wfFormatResult to
 191          * be sure that the very last result is formatted and shown.
 192          */
 193         function tryLastResult( ) {
 194                 return false;
 195         }
 196
 197         /**
 198          * Clear the cache and save new results
 199          */
 200         function recache( $limit, $ignoreErrors = true ) {
 201                 $fname = get_class($this) . '::recache';
 202                 $dbw = wfGetDB( DB_MASTER );
 203                 $dbr = wfGetDB( DB_SLAVE, array( $this->getName(), 'QueryPage::recache', 'vslow' ) );
 204                 if ( !$dbw || !$dbr ) {
 205                         return false;
 206                 }
 207
 208                 $querycache = $dbr->tableName( 'querycache' );
 209
 210                 if ( $ignoreErrors ) {
 211                         $ignoreW = $dbw->ignoreErrors( true );
 212                         $ignoreR = $dbr->ignoreErrors( true );
 213                 }
 214
 215                 # Clear out any old cached data
 216                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 217                 # Do query
 218                 $sql = $this->getSQL() . $this->getOrder();
 219                 if ($limit !== false)
 220                         $sql = $dbr->limitResult($sql, $limit, 0);
 221                 $res = $dbr->query($sql, $fname);
 222                 $num = false;
 223                 if ( $res ) {
 224                         $num = $dbr->numRows( $res );
 225                         # Fetch results
 226                         $insertSql = "INSERT INTO $querycache (qc_type,qc_namespace,qc_title,qc_value) VALUES ";
 227                         $first = true;
 228                         while ( $res && $row = $dbr->fetchObject( $res ) ) {
 229                                 if ( $first ) {
 230                                         $first = false;
 231                                 } else {
 232                                         $insertSql .= ',';
 233                                 }
 234                                 if ( isset( $row->value ) ) {
 235                                         $value = $row->value;
 236                                 } else {
 237                                         $value = '';
 238                                 }
 239
 240                                 $insertSql .= '(' .
 241                                         $dbw->addQuotes( $row->type ) . ',' .
 242                                         $dbw->addQuotes( $row->namespace ) . ',' .
 243                                         $dbw->addQuotes( $row->title ) . ',' .
 244                                         $dbw->addQuotes( $value ) . ')';
 245                         }
 246
 247                         # Save results into the querycache table on the master
 248                         if ( !$first ) {
 249                                 if ( !$dbw->query( $insertSql, $fname ) ) {
 250                                         // Set result to false to indicate error
 251                                         $dbr->freeResult( $res );
 252                                         $res = false;
 253                                 }
 254                         }
 255                         if ( $res ) {
 256                                 $dbr->freeResult( $res );
 257                         }
 258                         if ( $ignoreErrors ) {
 259                                 $dbw->ignoreErrors( $ignoreW );
 260                                 $dbr->ignoreErrors( $ignoreR );
 261                         }
 262
 263                         # Update the querycache_info record for the page
 264                         $dbw->delete( 'querycache_info', array( 'qci_type' => $this->getName() ), $fname );
 265                         $dbw->insert( 'querycache_info', array( 'qci_type' => $this->getName(), 'qci_timestamp' => $dbw->timestamp() ), $fname );
 266
 267                 }
 268                 return $num;
 269         }
 270
 271         /**
 272          * This is the actual workhorse. It does everything needed to make a
 273          * real, honest-to-gosh query page.
 274          *
 275          * @param $offset database query offset
 276          * @param $limit database query limit
 277          * @param $shownavigation show navigation like "next 200"?
 278          */
 279         function doQuery( $offset, $limit, $shownavigation=true ) {
 280                 global $wgUser, $wgOut, $wgLang, $wgContLang;
 281
 282                 $this->offset = $offset;
 283                 $this->limit = $limit;
 284
 285                 $sname = $this->getName();
 286                 $fname = get_class($this) . '::doQuery';
 287                 $dbr = wfGetDB( DB_SLAVE );
 288
 289                 $wgOut->setSyndicated( $this->isSyndicated() );
 290
 291                 if ( !$this->isCached() ) {
 292                         $sql = $this->getSQL();
 293                 } else {
 294                         # Get the cached result
 295                         $querycache = $dbr->tableName( 'querycache' );
 296                         $type = $dbr->strencode( $sname );
 297                         $sql =
 298                                 "SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
 299                                  FROM $querycache WHERE qc_type='$type'";
 300
 301                         if( !$this->listoutput ) {
 302
 303                                 # Fetch the timestamp of this update
 304                                 $tRes = $dbr->select( 'querycache_info', array( 'qci_timestamp' ), array( 'qci_type' => $type ), $fname );
 305                                 $tRow = $dbr->fetchObject( $tRes );
 306
 307                                 if( $tRow ) {
 308                                         $updated = $wgLang->timeAndDate( $tRow->qci_timestamp, true, true );
 309                                         $cacheNotice = wfMsg( 'perfcachedts', $updated );
 310                                         $wgOut->addMeta( 'Data-Cache-Time', $tRow->qci_timestamp );
 311                                         $wgOut->addInlineScript( "var dataCacheTime = '{$tRow->qci_timestamp}';" );
 312                                 } else {
 313                                         $cacheNotice = wfMsg( 'perfcached' );
 314                                 }
 315
 316                                 $wgOut->addWikiText( $cacheNotice );
 317
 318                                 # If updates on this page have been disabled, let the user know
 319                                 # that the data set won't be refreshed for now
 320                                 global $wgDisableQueryPageUpdate;
 321                                 if( is_array( $wgDisableQueryPageUpdate ) && in_array( $this->getName(), $wgDisableQueryPageUpdate ) ) {
 322                                         $wgOut->addWikiText( wfMsg( 'querypage-no-updates' ) );
 323                                 }
 324
 325                         }
 326
 327                 }
 328
 329                 $sql .= $this->getOrder();
 330                 $sql = $dbr->limitResult($sql, $limit, $offset);
 331                 $res = $dbr->query( $sql );
 332                 $num = $dbr->numRows($res);
 333
 334                 $this->preprocessResults( $dbr, $res );
 335
 336                 # Top header and navigation
 337                 if( $shownavigation ) {
 338                         $wgOut->addHtml( $this->getPageHeader() );
 339                         if( $num > 0 ) {
 340                                 $wgOut->addHtml( '<p>' . wfShowingResults( $offset, $num ) . '</p>' );
 341                                 # Disable the "next" link when we reach the end
 342                                 $paging = wfViewPrevNext( $offset, $limit, $wgContLang->specialPage( $sname ),
 343                                         wfArrayToCGI( $this->linkParameters() ), ( $num < $limit ) );
 344                                 $wgOut->addHtml( '<p>' . $paging . '</p>' );
 345                         } else {
 346                                 # No results to show, so don't bother with "showing X of Y" etc.
 347                                 # -- just let the user know and give up now
 348                                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'specialpage-empty' ) . '</p>' );
 349                                 return;
 350                         }
 351                 }
 352
 353                 # The actual results; specialist subclasses will want to handle this
 354                 # with more than a straight list, so we hand them the info, plus
 355                 # an OutputPage, and let them get on with it
 356                 $this->outputResults( $wgOut,
 357                         $wgUser->getSkin(),
 358                         $dbr, # Should use a ResultWrapper for this
 359                         $res,
 360                         $dbr->numRows( $res ),
 361                         $offset );
 362
 363                 # Repeat the paging links at the bottom
 364                 if( $shownavigation ) {
 365                         $wgOut->addHtml( '<p>' . $paging . '</p>' );
 366                 }
 367
 368                 return $num;
 369         }
 370
 371         /**
 372          * Format and output report results using the given information plus
 373          * OutputPage
 374          *
 375          * @param OutputPage $out OutputPage to print to
 376          * @param Skin $skin User skin to use
 377          * @param Database $dbr Database (read) connection to use
 378          * @param int $res Result pointer
 379          * @param int $num Number of available result rows
 380          * @param int $offset Paging offset
 381          */
 382         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 383                 global $wgContLang;
 384
 385                 if( $num > 0 ) {
 386                         $html = array();
 387                         if( !$this->listoutput )
 388                                 $html[] = $this->openList( $offset );
 389
 390                         # $res might contain the whole 1,000 rows, so we read up to
 391                         # $num [should update this to use a Pager]
 392                         for( $i = 0; $i < $num && $row = $dbr->fetchObject( $res ); $i++ ) {
 393                                 $line = $this->formatResult( $skin, $row );
 394                                 if( $line ) {
 395                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 396                                                 ? ' class="not-patrolled"'
 397                                                 : '';
 398                                         $html[] = $this->listoutput
 399                                                 ? $format
 400                                                 : "<li{$attr}>{$line}</li>\n";
 401                                 }
 402                         }
 403
 404                         # Flush the final result
 405                         if( $this->tryLastResult() ) {
 406                                 $row = null;
 407                                 $line = $this->formatResult( $skin, $row );
 408                                 if( $line ) {
 409                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 410                                                 ? ' class="not-patrolled"'
 411                                                 : '';
 412                                         $html[] = $this->listoutput
 413                                                 ? $format
 414                                                 : "<li{$attr}>{$line}</li>\n";
 415                                 }
 416                         }
 417
 418                         if( !$this->listoutput )
 419                                 $html[] = $this->closeList();
 420
 421                         $html = $this->listoutput
 422                                 ? $wgContLang->listToText( $html )
 423                                 : implode( '', $html );
 424
 425                         $out->addHtml( $html );
 426                 }
 427         }
 428
 429         function openList( $offset ) {
 430                 return "<ol start='" . ( $offset + 1 ) . "' class='special'>";
 431         }
 432
 433         function closeList() {
 434                 return '</ol>';
 435         }
 436
 437         /**
 438          * Do any necessary preprocessing of the result object.
 439          * You should pass this by reference: &$db , &$res  [although probably no longer necessary in PHP5]
 440          */
 441         function preprocessResults( &$db, &$res ) {}
 442
 443         /**
 444          * Similar to above, but packaging in a syndicated feed instead of a web page
 445          */
 446         function doFeed( $class = '', $limit = 50 ) {
 447                 global $wgFeedClasses;
 448
 449                 if( isset($wgFeedClasses[$class]) ) {
 450                         $feed = new $wgFeedClasses[$class](
 451                                 $this->feedTitle(),
 452                                 $this->feedDesc(),
 453                                 $this->feedUrl() );
 454                         $feed->outHeader();
 455
 456                         $dbr = wfGetDB( DB_SLAVE );
 457                         $sql = $this->getSQL() . $this->getOrder();
 458                         $sql = $dbr->limitResult( $sql, $limit, 0 );
 459                         $res = $dbr->query( $sql, 'QueryPage::doFeed' );
 460                         while( $obj = $dbr->fetchObject( $res ) ) {
 461                                 $item = $this->feedResult( $obj );
 462                                 if( $item ) $feed->outItem( $item );
 463                         }
 464                         $dbr->freeResult( $res );
 465
 466                         $feed->outFooter();
 467                         return true;
 468                 } else {
 469                         return false;
 470                 }
 471         }
 472
 473         /**
 474          * Override for custom handling. If the titles/links are ok, just do
 475          * feedItemDesc()
 476          */
 477         function feedResult( $row ) {
 478                 if( !isset( $row->title ) ) {
 479                         return NULL;
 480                 }
 481                 $title = Title::MakeTitle( intval( $row->namespace ), $row->title );
 482                 if( $title ) {
 483                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 484                         $comments = '';
 485                         if( $title ) {
 486                                 $talkpage = $title->getTalkPage();
 487                                 $comments = $talkpage->getFullURL();
 488                         }
 489
 490                         return new FeedItem(
 491                                 $title->getPrefixedText(),
 492                                 $this->feedItemDesc( $row ),
 493                                 $title->getFullURL(),
 494                                 $date,
 495                                 $this->feedItemAuthor( $row ),
 496                                 $comments);
 497                 } else {
 498                         return NULL;
 499                 }
 500         }
 501
 502         function feedItemDesc( $row ) {
 503                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 504         }
 505
 506         function feedItemAuthor( $row ) {
 507                 return isset( $row->user_text ) ? $row->user_text : '';
 508         }
 509
 510         function feedTitle() {
 511                 global $wgContLanguageCode, $wgSitename;
 512                 $page = SpecialPage::getPage( $this->getName() );
 513                 $desc = $page->getDescription();
 514                 return "$wgSitename - $desc [$wgContLanguageCode]";
 515         }
 516
 517         function feedDesc() {
 518                 return wfMsg( 'tagline' );
 519         }
 520
 521         function feedUrl() {
 522                 $title = SpecialPage::getTitleFor( $this->getName() );
 523                 return $title->getFullURL();
 524         }
 525 }
 526
 527 ?>