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( 'SpecialMostlinkedtemplates',    'Mostlinkedtemplates'                   ),
  29         array( 'MostlinkedPage',                'Mostlinked'                    ),
  30         array( 'MostrevisionsPage',             'Mostrevisions'                 ),
  31         array( 'FewestrevisionsPage',           'Fewestrevisions'               ),
  32         array( 'ShortPagesPage',                'Shortpages'                    ),
  33         array( 'UncategorizedCategoriesPage',   'Uncategorizedcategories'       ),
  34         array( 'UncategorizedPagesPage',        'Uncategorizedpages'            ),
  35         array( 'UncategorizedImagesPage',       'Uncategorizedimages'                   ),
  36         array( 'UncategorizedTemplatesPage',    'Uncategorizedtemplates'                ),
  37         array( 'UnusedCategoriesPage',          'Unusedcategories'              ),
  38         array( 'UnusedimagesPage',              'Unusedimages'                  ),
  39         array( 'WantedCategoriesPage',          'Wantedcategories'              ),
  40         array( 'WantedPagesPage',               'Wantedpages'                   ),
  41         array( 'UnwatchedPagesPage',            'Unwatchedpages'                ),
  42         array( 'UnusedtemplatesPage',           'Unusedtemplates'                               ),
  43         array( 'WithoutInterwikiPage',                  'Withoutinterwiki'                              ),
  44 );
  45 wfRunHooks( 'wgQueryPages', array( &$wgQueryPages ) );
  46
  47 global $wgDisableCounters;
  48 if ( !$wgDisableCounters )
  49         $wgQueryPages[] = array( 'PopularPagesPage',            'Popularpages'          );
  50
  51
  52 /**
  53  * This is a class for doing query pages; since they're almost all the same,
  54  * we factor out some of the functionality into a superclass, and let
  55  * subclasses derive from it.
  56  * @addtogroup SpecialPage
  57  */
  58 class QueryPage {
  59         /**
  60          * Whether or not we want plain listoutput rather than an ordered list
  61          *
  62          * @var bool
  63          */
  64         var $listoutput = false;
  65
  66         /**
  67          * The offset and limit in use, as passed to the query() function
  68          *
  69          * @var integer
  70          */
  71         var $offset = 0;
  72         var $limit = 0;
  73
  74         /**
  75          * A mutator for $this->listoutput;
  76          *
  77          * @param bool $bool
  78          */
  79         function setListoutput( $bool ) {
  80                 $this->listoutput = $bool;
  81         }
  82
  83         /**
  84          * Subclasses return their name here. Make sure the name is also
  85          * specified in SpecialPage.php and in Language.php as a language message
  86          * param.
  87          */
  88         function getName() {
  89                 return '';
  90         }
  91
  92         /**
  93          * Return title object representing this page
  94          *
  95          * @return Title
  96          */
  97         function getTitle() {
  98                 return SpecialPage::getTitleFor( $this->getName() );
  99         }
 100
 101         /**
 102          * Subclasses return an SQL query here.
 103          *
 104          * Note that the query itself should return the following four columns:
 105          * 'type' (your special page's name), 'namespace', 'title', and 'value'
 106          * *in that order*. 'value' is used for sorting.
 107          *
 108          * These may be stored in the querycache table for expensive queries,
 109          * and that cached data will be returned sometimes, so the presence of
 110          * extra fields can't be relied upon. The cached 'value' column will be
 111          * an integer; non-numeric values are useful only for sorting the initial
 112          * query.
 113          *
 114          * Don't include an ORDER or LIMIT clause, this will be added.
 115          */
 116         function getSQL() {
 117                 return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
 118         }
 119
 120         /**
 121          * Override to sort by increasing values
 122          */
 123         function sortDescending() {
 124                 return true;
 125         }
 126
 127         function getOrder() {
 128                 return ' ORDER BY value ' .
 129                         ($this->sortDescending() ? 'DESC' : '');
 130         }
 131
 132         /**
 133          * Is this query expensive (for some definition of expensive)? Then we
 134          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 135          * pages to be declared expensive. Some query pages are always expensive.
 136          */
 137         function isExpensive( ) {
 138                 global $wgDisableQueryPages;
 139                 return $wgDisableQueryPages;
 140         }
 141
 142         /**
 143          * Whether or not the output of the page in question is retrived from
 144          * the database cache.
 145          *
 146          * @return bool
 147          */
 148         function isCached() {
 149                 global $wgMiserMode;
 150
 151                 return $this->isExpensive() && $wgMiserMode;
 152         }
 153
 154         /**
 155          * Sometime we dont want to build rss / atom feeds.
 156          */
 157         function isSyndicated() {
 158                 return true;
 159         }
 160
 161         /**
 162          * Formats the results of the query for display. The skin is the current
 163          * skin; you can use it for making links. The result is a single row of
 164          * result data. You should be able to grab SQL results off of it.
 165          * If the function return "false", the line output will be skipped.
 166          */
 167         function formatResult( $skin, $result ) {
 168                 return '';
 169         }
 170
 171         /**
 172          * The content returned by this function will be output before any result
 173          */
 174         function getPageHeader( ) {
 175                 return '';
 176         }
 177
 178         /**
 179          * If using extra form wheely-dealies, return a set of parameters here
 180          * as an associative array. They will be encoded and added to the paging
 181          * links (prev/next/lengths).
 182          * @return array
 183          */
 184         function linkParameters() {
 185                 return array();
 186         }
 187
 188         /**
 189          * Some special pages (for example SpecialListusers) might not return the
 190          * current object formatted, but return the previous one instead.
 191          * Setting this to return true, will call one more time wfFormatResult to
 192          * be sure that the very last result is formatted and shown.
 193          */
 194         function tryLastResult( ) {
 195                 return false;
 196         }
 197
 198         /**
 199          * Clear the cache and save new results
 200          */
 201         function recache( $limit, $ignoreErrors = true ) {
 202                 $fname = get_class($this) . '::recache';
 203                 $dbw = wfGetDB( DB_MASTER );
 204                 $dbr = wfGetDB( DB_SLAVE, array( $this->getName(), 'QueryPage::recache', 'vslow' ) );
 205                 if ( !$dbw || !$dbr ) {
 206                         return false;
 207                 }
 208
 209                 $querycache = $dbr->tableName( 'querycache' );
 210
 211                 if ( $ignoreErrors ) {
 212                         $ignoreW = $dbw->ignoreErrors( true );
 213                         $ignoreR = $dbr->ignoreErrors( true );
 214                 }
 215
 216                 # Clear out any old cached data
 217                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 218                 # Do query
 219                 $sql = $this->getSQL() . $this->getOrder();
 220                 if ($limit !== false)
 221                         $sql = $dbr->limitResult($sql, $limit, 0);
 222                 $res = $dbr->query($sql, $fname);
 223                 $num = false;
 224                 if ( $res ) {
 225                         $num = $dbr->numRows( $res );
 226                         # Fetch results
 227                         $insertSql = "INSERT INTO $querycache (qc_type,qc_namespace,qc_title,qc_value) VALUES ";
 228                         $first = true;
 229                         while ( $res && $row = $dbr->fetchObject( $res ) ) {
 230                                 if ( $first ) {
 231                                         $first = false;
 232                                 } else {
 233                                         $insertSql .= ',';
 234                                 }
 235                                 if ( isset( $row->value ) ) {
 236                                         $value = $row->value;
 237                                 } else {
 238                                         $value = '';
 239                                 }
 240
 241                                 $insertSql .= '(' .
 242                                         $dbw->addQuotes( $row->type ) . ',' .
 243                                         $dbw->addQuotes( $row->namespace ) . ',' .
 244                                         $dbw->addQuotes( $row->title ) . ',' .
 245                                         $dbw->addQuotes( $value ) . ')';
 246                         }
 247
 248                         # Save results into the querycache table on the master
 249                         if ( !$first ) {
 250                                 if ( !$dbw->query( $insertSql, $fname ) ) {
 251                                         // Set result to false to indicate error
 252                                         $dbr->freeResult( $res );
 253                                         $res = false;
 254                                 }
 255                         }
 256                         if ( $res ) {
 257                                 $dbr->freeResult( $res );
 258                         }
 259                         if ( $ignoreErrors ) {
 260                                 $dbw->ignoreErrors( $ignoreW );
 261                                 $dbr->ignoreErrors( $ignoreR );
 262                         }
 263
 264                         # Update the querycache_info record for the page
 265                         $dbw->delete( 'querycache_info', array( 'qci_type' => $this->getName() ), $fname );
 266                         $dbw->insert( 'querycache_info', array( 'qci_type' => $this->getName(), 'qci_timestamp' => $dbw->timestamp() ), $fname );
 267
 268                 }
 269                 return $num;
 270         }
 271
 272         /**
 273          * This is the actual workhorse. It does everything needed to make a
 274          * real, honest-to-gosh query page.
 275          *
 276          * @param $offset database query offset
 277          * @param $limit database query limit
 278          * @param $shownavigation show navigation like "next 200"?
 279          */
 280         function doQuery( $offset, $limit, $shownavigation=true ) {
 281                 global $wgUser, $wgOut, $wgLang, $wgContLang;
 282
 283                 $this->offset = $offset;
 284                 $this->limit = $limit;
 285
 286                 $sname = $this->getName();
 287                 $fname = get_class($this) . '::doQuery';
 288                 $dbr = wfGetDB( DB_SLAVE );
 289
 290                 $wgOut->setSyndicated( $this->isSyndicated() );
 291
 292                 if ( !$this->isCached() ) {
 293                         $sql = $this->getSQL();
 294                 } else {
 295                         # Get the cached result
 296                         $querycache = $dbr->tableName( 'querycache' );
 297                         $type = $dbr->strencode( $sname );
 298                         $sql =
 299                                 "SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
 300                                  FROM $querycache WHERE qc_type='$type'";
 301
 302                         if( !$this->listoutput ) {
 303
 304                                 # Fetch the timestamp of this update
 305                                 $tRes = $dbr->select( 'querycache_info', array( 'qci_timestamp' ), array( 'qci_type' => $type ), $fname );
 306                                 $tRow = $dbr->fetchObject( $tRes );
 307
 308                                 if( $tRow ) {
 309                                         $updated = $wgLang->timeAndDate( $tRow->qci_timestamp, true, true );
 310                                         $wgOut->addMeta( 'Data-Cache-Time', $tRow->qci_timestamp );
 311                                         $wgOut->addInlineScript( "var dataCacheTime = '{$tRow->qci_timestamp}';" );
 312                                         $wgOut->addWikiMsg( 'perfcachedts', $updated );
 313                                 } else {
 314                                         $wgOut->addWikiMsg( 'perfcached' );
 315                                 }
 316
 317                                 # If updates on this page have been disabled, let the user know
 318                                 # that the data set won't be refreshed for now
 319                                 global $wgDisableQueryPageUpdate;
 320                                 if( is_array( $wgDisableQueryPageUpdate ) && in_array( $this->getName(), $wgDisableQueryPageUpdate ) ) {
 321                                         $wgOut->addWikiMsg( 'querypage-no-updates' );
 322                                 }
 323
 324                         }
 325
 326                 }
 327
 328                 $sql .= $this->getOrder();
 329                 $sql = $dbr->limitResult($sql, $limit, $offset);
 330                 $res = $dbr->query( $sql );
 331                 $num = $dbr->numRows($res);
 332
 333                 $this->preprocessResults( $dbr, $res );
 334
 335                 $wgOut->addHtml( XML::openElement( 'div', array('class' => 'mw-spcontent') ) );
 336
 337                 # Top header and navigation
 338                 if( $shownavigation ) {
 339                         $wgOut->addHtml( $this->getPageHeader() );
 340                         if( $num > 0 ) {
 341                                 $wgOut->addHtml( '<p>' . wfShowingResults( $offset, $num ) . '</p>' );
 342                                 # Disable the "next" link when we reach the end
 343                                 $paging = wfViewPrevNext( $offset, $limit, $wgContLang->specialPage( $sname ),
 344                                         wfArrayToCGI( $this->linkParameters() ), ( $num < $limit ) );
 345                                 $wgOut->addHtml( '<p>' . $paging . '</p>' );
 346                         } else {
 347                                 # No results to show, so don't bother with "showing X of Y" etc.
 348                                 # -- just let the user know and give up now
 349                                 $wgOut->addHtml( '<p>' . wfMsgHtml( 'specialpage-empty' ) . '</p>' );
 350                                 $wgOut->addHtml( XML::closeElement( 'div' ) );
 351                                 return;
 352                         }
 353                 }
 354
 355                 # The actual results; specialist subclasses will want to handle this
 356                 # with more than a straight list, so we hand them the info, plus
 357                 # an OutputPage, and let them get on with it
 358                 $this->outputResults( $wgOut,
 359                         $wgUser->getSkin(),
 360                         $dbr, # Should use a ResultWrapper for this
 361                         $res,
 362                         $dbr->numRows( $res ),
 363                         $offset );
 364
 365                 # Repeat the paging links at the bottom
 366                 if( $shownavigation ) {
 367                         $wgOut->addHtml( '<p>' . $paging . '</p>' );
 368                 }
 369
 370                 $wgOut->addHtml( XML::closeElement( 'div' ) );
 371
 372                 return $num;
 373         }
 374
 375         /**
 376          * Format and output report results using the given information plus
 377          * OutputPage
 378          *
 379          * @param OutputPage $out OutputPage to print to
 380          * @param Skin $skin User skin to use
 381          * @param Database $dbr Database (read) connection to use
 382          * @param int $res Result pointer
 383          * @param int $num Number of available result rows
 384          * @param int $offset Paging offset
 385          */
 386         protected function outputResults( $out, $skin, $dbr, $res, $num, $offset ) {
 387                 global $wgContLang;
 388
 389                 if( $num > 0 ) {
 390                         $html = array();
 391                         if( !$this->listoutput )
 392                                 $html[] = $this->openList( $offset );
 393
 394                         # $res might contain the whole 1,000 rows, so we read up to
 395                         # $num [should update this to use a Pager]
 396                         for( $i = 0; $i < $num && $row = $dbr->fetchObject( $res ); $i++ ) {
 397                                 $line = $this->formatResult( $skin, $row );
 398                                 if( $line ) {
 399                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 400                                                 ? ' class="not-patrolled"'
 401                                                 : '';
 402                                         $html[] = $this->listoutput
 403                                                 ? $line
 404                                                 : "<li{$attr}>{$line}</li>\n";
 405                                 }
 406                         }
 407
 408                         # Flush the final result
 409                         if( $this->tryLastResult() ) {
 410                                 $row = null;
 411                                 $line = $this->formatResult( $skin, $row );
 412                                 if( $line ) {
 413                                         $attr = ( isset( $row->usepatrol ) && $row->usepatrol && $row->patrolled == 0 )
 414                                                 ? ' class="not-patrolled"'
 415                                                 : '';
 416                                         $html[] = $this->listoutput
 417                                                 ? $line
 418                                                 : "<li{$attr}>{$line}</li>\n";
 419                                 }
 420                         }
 421
 422                         if( !$this->listoutput )
 423                                 $html[] = $this->closeList();
 424
 425                         $html = $this->listoutput
 426                                 ? $wgContLang->listToText( $html )
 427                                 : implode( '', $html );
 428
 429                         $out->addHtml( $html );
 430                 }
 431         }
 432
 433         function openList( $offset ) {
 434                 return "\n<ol start='" . ( $offset + 1 ) . "' class='special'>\n";
 435         }
 436
 437         function closeList() {
 438                 return "</ol>\n";
 439         }
 440
 441         /**
 442          * Do any necessary preprocessing of the result object.
 443          */
 444         function preprocessResults( $db, $res ) {}
 445
 446         /**
 447          * Similar to above, but packaging in a syndicated feed instead of a web page
 448          */
 449         function doFeed( $class = '', $limit = 50 ) {
 450                 global $wgFeed, $wgFeedClasses;
 451
 452                 if ( !$wgFeed ) {
 453                         global $wgOut;
 454                         $wgOut->addWikiMsg( 'feed-unavailable' );
 455                         return;
 456                 }
 457
 458                 if( isset($wgFeedClasses[$class]) ) {
 459                         $feed = new $wgFeedClasses[$class](
 460                                 $this->feedTitle(),
 461                                 $this->feedDesc(),
 462                                 $this->feedUrl() );
 463                         $feed->outHeader();
 464
 465                         $dbr = wfGetDB( DB_SLAVE );
 466                         $sql = $this->getSQL() . $this->getOrder();
 467                         $sql = $dbr->limitResult( $sql, $limit, 0 );
 468                         $res = $dbr->query( $sql, 'QueryPage::doFeed' );
 469                         while( $obj = $dbr->fetchObject( $res ) ) {
 470                                 $item = $this->feedResult( $obj );
 471                                 if( $item ) $feed->outItem( $item );
 472                         }
 473                         $dbr->freeResult( $res );
 474
 475                         $feed->outFooter();
 476                         return true;
 477                 } else {
 478                         return false;
 479                 }
 480         }
 481
 482         /**
 483          * Override for custom handling. If the titles/links are ok, just do
 484          * feedItemDesc()
 485          */
 486         function feedResult( $row ) {
 487                 if( !isset( $row->title ) ) {
 488                         return NULL;
 489                 }
 490                 $title = Title::MakeTitle( intval( $row->namespace ), $row->title );
 491                 if( $title ) {
 492                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 493                         $comments = '';
 494                         if( $title ) {
 495                                 $talkpage = $title->getTalkPage();
 496                                 $comments = $talkpage->getFullURL();
 497                         }
 498
 499                         return new FeedItem(
 500                                 $title->getPrefixedText(),
 501                                 $this->feedItemDesc( $row ),
 502                                 $title->getFullURL(),
 503                                 $date,
 504                                 $this->feedItemAuthor( $row ),
 505                                 $comments);
 506                 } else {
 507                         return NULL;
 508                 }
 509         }
 510
 511         function feedItemDesc( $row ) {
 512                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 513         }
 514
 515         function feedItemAuthor( $row ) {
 516                 return isset( $row->user_text ) ? $row->user_text : '';
 517         }
 518
 519         function feedTitle() {
 520                 global $wgContLanguageCode, $wgSitename;
 521                 $page = SpecialPage::getPage( $this->getName() );
 522                 $desc = $page->getDescription();
 523                 return "$wgSitename - $desc [$wgContLanguageCode]";
 524         }
 525
 526         function feedDesc() {
 527                 return wfMsg( 'tagline' );
 528         }
 529
 530         function feedUrl() {
 531                 $title = SpecialPage::getTitleFor( $this->getName() );
 532                 return $title->getFullURL();
 533         }
 534 }
 535
 536