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| 1 | <?php |
| 2 | /** |
| 3 | * Communications protocol. |
| 4 | * This is used by dumpTextPass.php when the --spawn option is present. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License along |
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 19 | * http://www.gnu.org/copyleft/gpl.html |
| 20 | * |
| 21 | * @file |
| 22 | * @ingroup Maintenance |
| 23 | */ |
| 24 | |
| 25 | // @codeCoverageIgnoreStart |
| 26 | require_once __DIR__ . '/Maintenance.php'; |
| 27 | // @codeCoverageIgnoreEnd |
| 28 | |
| 29 | use MediaWiki\MainConfigNames; |
| 30 | use MediaWiki\Settings\SettingsBuilder; |
| 31 | use MediaWiki\Storage\BlobAccessException; |
| 32 | use MediaWiki\Storage\BlobStore; |
| 33 | use MediaWiki\Storage\SqlBlobStore; |
| 34 | |
| 35 | /** |
| 36 | * Maintenance script used to fetch page text in a subprocess. |
| 37 | * |
| 38 | * @ingroup Maintenance |
| 39 | */ |
| 40 | class FetchText extends Maintenance { |
| 41 | |
| 42 | public function __construct() { |
| 43 | parent::__construct(); |
| 44 | $this->addDescription( "Fetch the raw revision blob from a blob address.\n" . |
| 45 | "Integer IDs are interpreted as referring to text.old_id for backwards compatibility.\n" . |
| 46 | "NOTE: Export transformations are NOT applied. " . |
| 47 | "This is left to dumpTextPass.php" |
| 48 | ); |
| 49 | } |
| 50 | |
| 51 | public function finalSetup( SettingsBuilder $settingsBuilder ) { |
| 52 | // This script should always try to run all db queries in the 'dump' group if such |
| 53 | // a group exists, just like the BackupDumper and TextPassDumper modules. |
| 54 | // To account for parts of MediaWiki that get their own db connection outside of |
| 55 | // Maintenance::getDB(), we set this global variable so that they will attempt |
| 56 | // to use this group. |
| 57 | $settingsBuilder->putConfigValue( MainConfigNames::DBDefaultGroup, 'dump' ); |
| 58 | // do this last so that options can override |
| 59 | |
| 60 | parent::finalSetup( $settingsBuilder ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * @return BlobStore |
| 65 | */ |
| 66 | private function getBlobStore() { |
| 67 | return $this->getServiceContainer()->getBlobStore(); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * returns a string containing the following in order: |
| 72 | * textid |
| 73 | * \n |
| 74 | * length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc) |
| 75 | * \n |
| 76 | * text (may be empty) |
| 77 | * |
| 78 | * note that the text string itself is *not* followed by newline |
| 79 | */ |
| 80 | public function execute() { |
| 81 | $stdin = $this->getStdin(); |
| 82 | while ( !feof( $stdin ) ) { |
| 83 | $line = fgets( $stdin ); |
| 84 | if ( $line === false ) { |
| 85 | // We appear to have lost contact... |
| 86 | break; |
| 87 | } |
| 88 | $blobAddress = trim( $line ); |
| 89 | |
| 90 | // Plain integers are supported for backwards compatibility with pre-MCR dumps. |
| 91 | if ( strpos( $blobAddress, ':' ) === false && is_numeric( $blobAddress ) ) { |
| 92 | $blobAddress = SqlBlobStore::makeAddressFromTextId( intval( $blobAddress ) ); |
| 93 | } |
| 94 | |
| 95 | try { |
| 96 | $text = $this->getBlobStore()->getBlob( $blobAddress ); |
| 97 | $textLen = strlen( $text ); |
| 98 | } catch ( BlobAccessException | InvalidArgumentException $ex ) { |
| 99 | // XXX: log $ex to stderr? |
| 100 | $textLen = '-1'; |
| 101 | $text = ''; |
| 102 | } |
| 103 | |
| 104 | $this->output( $blobAddress . "\n" . $textLen . "\n" . $text ); |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | } |
| 109 | |
| 110 | // @codeCoverageIgnoreStart |
| 111 | $maintClass = FetchText::class; |
| 112 | require_once RUN_MAINTENANCE_IF_MAIN; |
| 113 | // @codeCoverageIgnoreEnd |