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| 1 | <?php |
| 2 | /** |
| 3 | * An interface to delete a "Cargo table", which can be one or more real |
| 4 | * database tables. |
| 5 | * |
| 6 | * @author Yaron Koren |
| 7 | * @ingroup Cargo |
| 8 | */ |
| 9 | |
| 10 | use MediaWiki\MediaWikiServices; |
| 11 | |
| 12 | class SpecialSwitchCargoTable extends UnlistedSpecialPage { |
| 13 | |
| 14 | public function __construct() { |
| 15 | parent::__construct( 'SwitchCargoTable', 'recreatecargodata' ); |
| 16 | } |
| 17 | |
| 18 | public function doesWrites() { |
| 19 | return true; |
| 20 | } |
| 21 | |
| 22 | /** |
| 23 | * The table being switched here is a Cargo table, not a DB table per |
| 24 | * se - a Cargo table corresponds to a main DB table, plus |
| 25 | * potentially one or more helper tables; all need to be switched. |
| 26 | * Also, records need to be removed, and modified, in the cargo_tables and |
| 27 | * cargo_pages tables. |
| 28 | */ |
| 29 | public static function switchInTableReplacement( |
| 30 | $mainTable, |
| 31 | $fieldTables, |
| 32 | $fieldHelperTables, |
| 33 | User $user |
| 34 | ) { |
| 35 | $cdb = CargoUtils::getDB(); |
| 36 | try { |
| 37 | $cdb->begin(); |
| 38 | |
| 39 | // The helper tables' names come from the database, |
| 40 | // so they already contain '__NEXT' - remove that, |
| 41 | // instead of adding it, when getting table names. |
| 42 | foreach ( $fieldTables as $fieldTable ) { |
| 43 | $origFieldTable = str_replace( '__NEXT', '', $fieldTable ); |
| 44 | $cdb->dropTable( $origFieldTable ); |
| 45 | $cdb->query( 'ALTER TABLE ' . |
| 46 | $cdb->tableName( $fieldTable ) . |
| 47 | ' RENAME TO ' . |
| 48 | $cdb->tableName( $origFieldTable ) ); |
| 49 | } |
| 50 | if ( is_array( $fieldHelperTables ) ) { |
| 51 | foreach ( $fieldHelperTables as $fieldHelperTable ) { |
| 52 | $origFieldHelperTable = str_replace( '__NEXT', '', $fieldHelperTable ); |
| 53 | $cdb->dropTable( $origFieldHelperTable ); |
| 54 | $cdb->query( 'ALTER TABLE ' . |
| 55 | $cdb->tableName( $fieldHelperTable ) . |
| 56 | ' RENAME TO ' . |
| 57 | $cdb->tableName( $origFieldHelperTable ) ); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | $cdb->dropTable( $mainTable ); |
| 62 | $cdb->query( 'ALTER TABLE ' . |
| 63 | $cdb->tableName( $mainTable . '__NEXT' ) . |
| 64 | ' RENAME TO ' . $cdb->tableName( $mainTable ) ); |
| 65 | |
| 66 | $cdb->commit(); |
| 67 | } catch ( Exception $e ) { |
| 68 | throw new MWException( "Caught exception ($e) while trying to switch in replacement for Cargo table. " |
| 69 | . "Please make sure that your database user account has the DROP permission." ); |
| 70 | } |
| 71 | |
| 72 | $dbw = wfGetDB( DB_MASTER ); |
| 73 | $dbw->delete( 'cargo_tables', [ 'main_table' => $mainTable ] ); |
| 74 | $dbw->delete( 'cargo_pages', [ 'table_name' => $mainTable ] ); |
| 75 | $dbw->update( 'cargo_tables', [ 'main_table' => $mainTable ], [ 'main_table' => $mainTable . '__NEXT' ] ); |
| 76 | $origFieldTableNames = []; |
| 77 | foreach ( $fieldTables as $fieldTable ) { |
| 78 | $origFieldTableNames[] = str_replace( '__NEXT', '', $fieldTable ); |
| 79 | } |
| 80 | $dbw->update( 'cargo_tables', [ 'field_tables' => serialize( $origFieldTableNames ) ], [ 'main_table' => $mainTable ] ); |
| 81 | $dbw->update( 'cargo_pages', [ 'table_name' => $mainTable ], [ 'table_name' => $mainTable . '__NEXT' ] ); |
| 82 | |
| 83 | CargoUtils::logTableAction( 'replacetable', $mainTable, $user ); |
| 84 | } |
| 85 | |
| 86 | public function execute( $subpage = false ) { |
| 87 | $this->checkPermissions(); |
| 88 | |
| 89 | $out = $this->getOutput(); |
| 90 | $tableName = $subpage; |
| 91 | $out->enableOOUI(); |
| 92 | |
| 93 | $this->setHeaders(); |
| 94 | if ( $tableName == '' ) { |
| 95 | CargoUtils::displayErrorMessage( $out, $this->msg( "cargo-notable" ) ); |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | // Make sure that this table, and its replacement, both exist. |
| 100 | $lb = MediaWikiServices::getInstance()->getDBLoadBalancer(); |
| 101 | $dbr = $lb->getConnectionRef( DB_REPLICA ); |
| 102 | $res = $dbr->select( 'cargo_tables', [ 'main_table', 'field_tables', 'field_helper_tables' ], |
| 103 | [ 'main_table' => $tableName ] ); |
| 104 | if ( $res->numRows() == 0 ) { |
| 105 | CargoUtils::displayErrorMessage( $out, $this->msg( "cargo-unknowntable", $tableName ) ); |
| 106 | return true; |
| 107 | } |
| 108 | $res = $dbr->select( 'cargo_tables', [ 'main_table', 'field_tables', 'field_helper_tables' ], |
| 109 | [ 'main_table' => $tableName . '__NEXT' ] ); |
| 110 | if ( $res->numRows() == 0 ) { |
| 111 | CargoUtils::displayErrorMessage( $out, $this->msg( "cargo-unknowntable", $tableName . "__NEXT" ) ); |
| 112 | return true; |
| 113 | } |
| 114 | |
| 115 | $ctPage = CargoUtils::getSpecialPage( 'CargoTables' ); |
| 116 | $row = $res->fetchRow(); |
| 117 | $fieldTables = unserialize( $row['field_tables'] ); |
| 118 | $fieldHelperTables = unserialize( $row['field_helper_tables'] ); |
| 119 | |
| 120 | if ( $this->getRequest()->getCheck( 'switch' ) ) { |
| 121 | self::switchInTableReplacement( $tableName, $fieldTables, $fieldHelperTables, $this->getUser() ); |
| 122 | $text = Html::element( 'p', null, $this->msg( 'cargo-switchtables-success', $tableName )->parse() ) . "\n"; |
| 123 | $tablesLink = CargoUtils::makeLink( $this->getLinkRenderer(), |
| 124 | $ctPage->getPageTitle(), $ctPage->getDescription() ); |
| 125 | $text .= Html::rawElement( 'p', null, $this->msg( 'returnto', $tablesLink )->text() ); |
| 126 | $out->addHTML( $text ); |
| 127 | return true; |
| 128 | } |
| 129 | |
| 130 | $ctURL = $ctPage->getPageTitle()->getLocalURL(); |
| 131 | $tableLink = Html::element( 'a', [ 'href' => "$ctURL/$tableName", ], $tableName ); |
| 132 | |
| 133 | $text = Html::rawElement( 'p', null, $this->msg( 'cargo-switchtables-confirm', $tableLink )->text() ); |
| 134 | $out->addHTML( $text ); |
| 135 | |
| 136 | $htmlForm = HTMLForm::factory( 'ooui', [], $this->getContext() ); |
| 137 | $htmlForm |
| 138 | ->setSubmitName( 'switch' ) |
| 139 | ->setSubmitTextMsg( 'cargo-switchtables-switch' ) |
| 140 | ->prepareForm() |
| 141 | ->displayForm( false ); |
| 142 | |
| 143 | return true; |
| 144 | } |
| 145 | |
| 146 | } |