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| 1 | <?php |
| 2 | /** |
| 3 | * Special page to list files with most global usages |
| 4 | * |
| 5 | * @file |
| 6 | * @ingroup SpecialPage |
| 7 | * @author Brian Wolff <bawolff+wn@gmail.com> |
| 8 | */ |
| 9 | |
| 10 | namespace MediaWiki\Extension\GlobalUsage; |
| 11 | |
| 12 | use MediaWiki\Cache\LinkBatchFactory; |
| 13 | use MediaWiki\SpecialPage\ImageQueryPage; |
| 14 | use MediaWiki\WikiMap\WikiMap; |
| 15 | use RuntimeException; |
| 16 | use Wikimedia\Rdbms\IConnectionProvider; |
| 17 | use Wikimedia\Rdbms\IDatabase; |
| 18 | |
| 19 | class SpecialMostGloballyLinkedFiles extends ImageQueryPage { |
| 20 | |
| 21 | public function __construct( |
| 22 | IConnectionProvider $dbProvider, |
| 23 | LinkBatchFactory $linkBatchFactory |
| 24 | ) { |
| 25 | parent::__construct( 'MostGloballyLinkedFiles' ); |
| 26 | $this->setDatabaseProvider( $dbProvider ); |
| 27 | $this->setLinkBatchFactory( $linkBatchFactory ); |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Main execution function. Use the parent if we're on the right wiki. |
| 32 | * If we're not on a shared repo, try to redirect there. |
| 33 | * @param string $par |
| 34 | */ |
| 35 | public function execute( $par ) { |
| 36 | if ( GlobalUsage::onSharedRepo() ) { |
| 37 | parent::execute( $par ); |
| 38 | } else { |
| 39 | GlobalUsage::redirectSpecialPageToSharedRepo( $this->getContext() ); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | /** @inheritDoc */ |
| 44 | public function isExpensive() { |
| 45 | return true; |
| 46 | } |
| 47 | |
| 48 | /** @inheritDoc */ |
| 49 | public function isSyndicated() { |
| 50 | return false; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Don't want to do cached handling on non-shared repo, since we only redirect. |
| 55 | * @return bool |
| 56 | */ |
| 57 | public function isCacheable() { |
| 58 | return GlobalUsage::onSharedRepo(); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * What query to do. |
| 63 | * @return array |
| 64 | */ |
| 65 | public function getQueryInfo() { |
| 66 | $this->assertOnSharedRepo(); |
| 67 | return [ |
| 68 | 'tables' => [ 'globalimagelinks' ], |
| 69 | 'fields' => [ |
| 70 | 'namespace' => NS_FILE, |
| 71 | 'title' => 'gil_to', |
| 72 | 'value' => 'COUNT(*)' |
| 73 | ], |
| 74 | 'options' => [ |
| 75 | 'GROUP BY' => 'gil_to', |
| 76 | 'HAVING' => 'COUNT(*) > 1' |
| 77 | ] |
| 78 | ]; |
| 79 | } |
| 80 | |
| 81 | /** @inheritDoc */ |
| 82 | protected function getCellHtml( $row ) { |
| 83 | return $this->msg( 'nimagelinks' )->numParams( $row->value )->escaped() . '<br />'; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Make sure we are on the shared repo. |
| 88 | * |
| 89 | * This function should only be used as a paranoia check, and should never actually be hit. |
| 90 | * There should be actual error handling for any code path a user could hit. |
| 91 | */ |
| 92 | protected function assertOnSharedRepo() { |
| 93 | if ( !GlobalUsage::onSharedRepo() ) { |
| 94 | throw new RuntimeException( |
| 95 | 'Special:MostGloballyLinkedFiles should only be processed on the shared repo' |
| 96 | ); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Only list this special page on the wiki that is the shared repo. |
| 102 | * |
| 103 | * @return bool Should this be listed in Special:SpecialPages |
| 104 | */ |
| 105 | public function isListed() { |
| 106 | return GlobalUsage::onSharedRepo(); |
| 107 | } |
| 108 | |
| 109 | /** |
| 110 | * In most common configs (including WMF's), this wouldn't be needed. However |
| 111 | * for completeness support having the shared repo db be separate from the |
| 112 | * globalimagelinks db. |
| 113 | * @return IDatabase |
| 114 | */ |
| 115 | public function getRecacheDB() { |
| 116 | // There's no reason why we couldn't make this special page work on all wikis, |
| 117 | // it just doesn't really make sense to. We should be prevented from getting |
| 118 | // to this point by $this->isCachable(), but just to be safe: |
| 119 | $this->assertOnSharedRepo(); |
| 120 | |
| 121 | $globalUsageDatabase = $this->getConfig()->get( 'GlobalUsageDatabase' ); |
| 122 | if ( $globalUsageDatabase === false || $globalUsageDatabase === WikiMap::getCurrentWikiId() ) { |
| 123 | // We are using the local wiki |
| 124 | return parent::getRecacheDB(); |
| 125 | } else { |
| 126 | // The global usage db could be on a different db |
| 127 | return GlobalUsage::getGlobalDB( |
| 128 | DB_REPLICA, |
| 129 | [ $this->getName(), 'QueryPage::recache', 'vslow' ] |
| 130 | ); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /** @inheritDoc */ |
| 135 | protected function getGroupName() { |
| 136 | return 'highuse'; |
| 137 | } |
| 138 | } |