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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 | require_once __DIR__ . '/Maintenance.php'; |
26 | |
27 | use MediaWiki\MainConfigNames; |
28 | use MediaWiki\Settings\SettingsBuilder; |
29 | use MediaWiki\Storage\BlobAccessException; |
30 | use MediaWiki\Storage\BlobStore; |
31 | use MediaWiki\Storage\SqlBlobStore; |
32 | |
33 | /** |
34 | * Maintenance script used to fetch page text in a subprocess. |
35 | * |
36 | * @ingroup Maintenance |
37 | */ |
38 | class FetchText extends Maintenance { |
39 | |
40 | public function __construct() { |
41 | parent::__construct(); |
42 | $this->addDescription( "Fetch the raw revision blob from a blob address.\n" . |
43 | "Integer IDs are interpreted as referring to text.old_id for backwards compatibility.\n" . |
44 | "NOTE: Export transformations are NOT applied. " . |
45 | "This is left to dumpTextPass.php" |
46 | ); |
47 | } |
48 | |
49 | public function finalSetup( SettingsBuilder $settingsBuilder ) { |
50 | // This script should always try to run all db queries in the 'dump' group if such |
51 | // a group exists, just like the BackupDumper and TextPassDumper modules. |
52 | // To account for parts of MediaWiki that get their own db connection outside of |
53 | // Maintenance::getDB(), we set this global variable so that they will attempt |
54 | // to use this group. |
55 | $settingsBuilder->putConfigValue( MainConfigNames::DBDefaultGroup, 'dump' ); |
56 | // do this last so that options can override |
57 | |
58 | parent::finalSetup( $settingsBuilder ); |
59 | } |
60 | |
61 | /** |
62 | * @return BlobStore |
63 | */ |
64 | private function getBlobStore() { |
65 | return $this->getServiceContainer()->getBlobStore(); |
66 | } |
67 | |
68 | /** |
69 | * returns a string containing the following in order: |
70 | * textid |
71 | * \n |
72 | * length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc) |
73 | * \n |
74 | * text (may be empty) |
75 | * |
76 | * note that the text string itself is *not* followed by newline |
77 | */ |
78 | public function execute() { |
79 | $stdin = $this->getStdin(); |
80 | while ( !feof( $stdin ) ) { |
81 | $line = fgets( $stdin ); |
82 | if ( $line === false ) { |
83 | // We appear to have lost contact... |
84 | break; |
85 | } |
86 | $blobAddress = trim( $line ); |
87 | |
88 | // Plain integers are supported for backwards compatibility with pre-MCR dumps. |
89 | if ( strpos( $blobAddress, ':' ) === false && is_numeric( $blobAddress ) ) { |
90 | $blobAddress = SqlBlobStore::makeAddressFromTextId( intval( $blobAddress ) ); |
91 | } |
92 | |
93 | try { |
94 | $text = $this->getBlobStore()->getBlob( $blobAddress ); |
95 | $textLen = strlen( $text ); |
96 | } catch ( BlobAccessException | InvalidArgumentException $ex ) { |
97 | // XXX: log $ex to stderr? |
98 | $textLen = '-1'; |
99 | $text = ''; |
100 | } |
101 | |
102 | $this->output( $blobAddress . "\n" . $textLen . "\n" . $text ); |
103 | } |
104 | } |
105 | |
106 | } |
107 | |
108 | $maintClass = FetchText::class; |
109 | require_once RUN_MAINTENANCE_IF_MAIN; |