FixBug20757::waitForSlaves() - Code Metrics - wikimedia/mediawiki - Measure and Improve Code Quality continuously with Scrutinizer

FixBug20757::waitForSlaves() A
last analyzed 2016-11-13 17:42 UTC

↳ Parent: FixBug20757

Complexity

Conditions	2
Paths	2

Size

Total Lines	8
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	6
nc	2
nop	0
dl	0
loc	8
rs	9.4285
c	0
b	0
f	0

<?php

/**
 * Script to fix bug 20757.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance ExternalStorage
 */

require_once __DIR__ . '/../Maintenance.php';

/**
 * Maintenance script to fix bug 20757.
 *
 * @ingroup Maintenance ExternalStorage
 */
class FixBug20757 extends Maintenance {
	public $batchSize = 10000;
	public $mapCache = [];
	public $mapCacheSize = 0;
	public $maxMapCacheSize = 1000000;

	function __construct() {
		parent::__construct();
		$this->addDescription( 'Script to fix bug 20757 assuming that blob_tracking is intact' );
		$this->addOption( 'dry-run', 'Report only' );
		$this->addOption( 'start', 'old_id to start at', false, true );
	}

	function execute() {
		$dbr = $this->getDB( DB_REPLICA );
		$dbw = $this->getDB( DB_MASTER );

		$dryRun = $this->getOption( 'dry-run' );
		if ( $dryRun ) {
			print "Dry run only.\n";
		}

		$startId = $this->getOption( 'start', 0 );
		$numGood = 0;
		$numFixed = 0;
		$numBad = 0;

		$totalRevs = $dbr->selectField( 'text', 'MAX(old_id)', false, __METHOD__ );

		// In MySQL 4.1+, the binary field old_text has a non-working LOWER() function
		$lowerLeft = 'LOWER(CONVERT(LEFT(old_text,22) USING latin1))';

		while ( true ) {
			print "ID: $startId / $totalRevs\r";

			$res = $dbr->select(
				'text',
				[ 'old_id', 'old_flags', 'old_text' ],
				[
					'old_id > ' . intval( $startId ),
					'old_flags LIKE \'%object%\' AND old_flags NOT LIKE \'%external%\'',
					"$lowerLeft = 'o:15:\"historyblobstub\"'",
				],
				__METHOD__,
				[
					'ORDER BY' => 'old_id',
					'LIMIT' => $this->batchSize,
				]
			);

			if ( !$res->numRows() ) {
				break;
			}

			$secondaryIds = [];
			$stubs = [];

			foreach ( $res as $row ) {
				$startId = $row->old_id;

				// Basic sanity checks
				$obj = unserialize( $row->old_text );
				if ( $obj === false ) {
					print "{$row->old_id}: unrecoverable: cannot unserialize\n";
					++$numBad;
					continue;
				}

				if ( !is_object( $obj ) ) {
					print "{$row->old_id}: unrecoverable: unserialized to type " .
						gettype( $obj ) . ", possible double-serialization\n";
					++$numBad;
					continue;
				}

				if ( strtolower( get_class( $obj ) ) !== 'historyblobstub' ) {
					print "{$row->old_id}: unrecoverable: unexpected object class " .
						get_class( $obj ) . "\n";
					++$numBad;
					continue;
				}

				// Process flags
				$flags = explode( ',', $row->old_flags );
				if ( in_array( 'utf-8', $flags ) || in_array( 'utf8', $flags ) ) {
					$legacyEncoding = false;
				} else {
					$legacyEncoding = true;
				}

				// Queue the stub for future batch processing
				$id = intval( $obj->mOldId );
				$secondaryIds[] = $id;
				$stubs[$row->old_id] = [
					'legacyEncoding' => $legacyEncoding,
					'secondaryId' => $id,
					'hash' => $obj->mHash,
				];
			}

			$secondaryIds = array_unique( $secondaryIds );

			if ( !count( $secondaryIds ) ) {
				continue;
			}

			// Run the batch query on blob_tracking
			$res = $dbr->select(
				'blob_tracking',
				'*',
				[
					'bt_text_id' => $secondaryIds,
				],
				__METHOD__
			);
			$trackedBlobs = [];
			foreach ( $res as $row ) {
				$trackedBlobs[$row->bt_text_id] = $row;
			}

			// Process the stubs
			foreach ( $stubs as $primaryId => $stub ) {
				$secondaryId = $stub['secondaryId'];
				if ( !isset( $trackedBlobs[$secondaryId] ) ) {
					// No tracked blob. Work out what went wrong
					$secondaryRow = $dbr->selectRow(
						'text',
						[ 'old_flags', 'old_text' ],
						[ 'old_id' => $secondaryId ],
						__METHOD__
					);
					if ( !$secondaryRow ) {
						print "$primaryId: unrecoverable: secondary row is missing\n";
						++$numBad;
					} elseif ( $this->isUnbrokenStub( $stub, $secondaryRow ) ) {
						// Not broken yet, and not in the tracked clusters so it won't get
						// broken by the current RCT run.
						++$numGood;
					} elseif ( strpos( $secondaryRow->old_flags, 'external' ) !== false ) {
						print "$primaryId: unrecoverable: secondary gone to {$secondaryRow->old_text}\n";
						++$numBad;
					} else {
						print "$primaryId: unrecoverable: miscellaneous corruption of secondary row\n";
						++$numBad;
					}
					unset( $stubs[$primaryId] );
					continue;
				}
				$trackRow = $trackedBlobs[$secondaryId];

				// Check that the specified text really is available in the tracked source row
				$url = "DB://{$trackRow->bt_cluster}/{$trackRow->bt_blob_id}/{$stub['hash']}";
				$text = ExternalStore::fetchFromURL( $url );
				if ( $text === false ) {
					print "$primaryId: unrecoverable: source text missing\n";
					++$numBad;
					unset( $stubs[$primaryId] );
					continue;
				}
				if ( md5( $text ) !== $stub['hash'] ) {
					print "$primaryId: unrecoverable: content hashes do not match\n";
					++$numBad;
					unset( $stubs[$primaryId] );
					continue;
				}

				// Find the page_id and rev_id
				// The page is probably the same as the page of the secondary row
				$pageId = intval( $trackRow->bt_page );
				if ( !$pageId ) {
					$revId = $pageId = 0;
				} else {
					$revId = $this->findTextIdInPage( $pageId, $primaryId );
					if ( !$revId ) {
						// Actually an orphan
						$pageId = $revId = 0;
					}
				}

				$newFlags = $stub['legacyEncoding'] ? 'external' : 'external,utf-8';

				if ( !$dryRun ) {
					// Reset the text row to point to the original copy
					$this->beginTransaction( $dbw, __METHOD__ );
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
					$dbw->update(
						'text',
						// SET
						[
							'old_flags' => $newFlags,
							'old_text' => $url
						],
						// WHERE
						[ 'old_id' => $primaryId ],
						__METHOD__
					);

					// Add a blob_tracking row so that the new reference can be recompressed
					// without needing to run trackBlobs.php again
					$dbw->insert( 'blob_tracking',
						[
							'bt_page' => $pageId,
							'bt_rev_id' => $revId,
							'bt_text_id' => $primaryId,
							'bt_cluster' => $trackRow->bt_cluster,
							'bt_blob_id' => $trackRow->bt_blob_id,
							'bt_cgz_hash' => $stub['hash'],
							'bt_new_url' => null,
							'bt_moved' => 0,
						],
						__METHOD__
					);
					$this->commitTransaction( $dbw, __METHOD__ );
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
					$this->waitForSlaves();
				}

				print "$primaryId: resolved to $url\n";
				++$numFixed;
			}
		}

		print "\n";
		print "Fixed: $numFixed\n";
		print "Unrecoverable: $numBad\n";
		print "Good stubs: $numGood\n";
	}

	function waitForSlaves() {
		static $iteration = 0;
		++$iteration;
		if ( ++$iteration > 50 == 0 ) {
			wfWaitForSlaves();

			$iteration = 0;
		}
	}

	function findTextIdInPage( $pageId, $textId ) {
		$ids = $this->getRevTextMap( $pageId );
		if ( !isset( $ids[$textId] ) ) {
			return null;
		} else {
			return $ids[$textId];
		}
	}

	function getRevTextMap( $pageId ) {
		if ( !isset( $this->mapCache[$pageId] ) ) {
			// Limit cache size
			while ( $this->mapCacheSize > $this->maxMapCacheSize ) {
				$key = key( $this->mapCache );
				$this->mapCacheSize -= count( $this->mapCache[$key] );
				unset( $this->mapCache[$key] );
			}

			$dbr = $this->getDB( DB_REPLICA );
			$map = [];
			$res = $dbr->select( 'revision',
				[ 'rev_id', 'rev_text_id' ],
				[ 'rev_page' => $pageId ],
				__METHOD__
			);
			foreach ( $res as $row ) {
				$map[$row->rev_text_id] = $row->rev_id;
			}
			$this->mapCache[$pageId] = $map;
			$this->mapCacheSize += count( $map );
		}

		return $this->mapCache[$pageId];
	}

	/**
	 * This is based on part of HistoryBlobStub::getText().
	 * Determine if the text can be retrieved from the row in the normal way.
	 * @param array $stub
	 * @param stdClass $secondaryRow
	 * @return bool
	 */
	function isUnbrokenStub( $stub, $secondaryRow ) {
		$flags = explode( ',', $secondaryRow->old_flags );
		$text = $secondaryRow->old_text;
		if ( in_array( 'external', $flags ) ) {
			$url = $text;
			MediaWiki\suppressWarnings();
			list( /* $proto */, $path ) = explode( '://', $url, 2 );
			MediaWiki\restoreWarnings();

			if ( $path == "" ) {
				return false;
			}
			$text = ExternalStore::fetchFromURL( $url );
		}
		if ( !in_array( 'object', $flags ) ) {
			return false;
		}

		if ( in_array( 'gzip', $flags ) ) {
			$obj = unserialize( gzinflate( $text ) );
		} else {
			$obj = unserialize( $text );
		}

		if ( !is_object( $obj ) ) {
			// Correct for old double-serialization bug.
			$obj = unserialize( $obj );
		}

		if ( !is_object( $obj ) ) {
			return false;
		}

		$obj->uncompress();
		$text = $obj->getItem( $stub['hash'] );

		return $text !== false;
	}
}

$maintClass = 'FixBug20757';
require_once RUN_MAINTENANCE_IF_MAIN;


1		<?php
		0 ignored issues – show Coding Style Compatibility introduced 2016-02-23 18:14 UTC by Report Bug Copy Issue Report For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 31 and the first side effect is on line 24. The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file. The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place. To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1. Loading history...
2		/**
3		* Script to fix bug 20757.
4		*
5		* This program is free software; you can redistribute it and/or modify
6		* it under the terms of the GNU General Public License as published by
7		* the Free Software Foundation; either version 2 of the License, or
8		* (at your option) any later version.
9		*
10		* This program is distributed in the hope that it will be useful,
11		* but WITHOUT ANY WARRANTY; without even the implied warranty of
12		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13		* GNU General Public License for more details.
14		*
15		* You should have received a copy of the GNU General Public License along
16		* with this program; if not, write to the Free Software Foundation, Inc.,
17		* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18		* http://www.gnu.org/copyleft/gpl.html
19		*
20		* @file
21		* @ingroup Maintenance ExternalStorage
22		*/
23
24		require_once __DIR__ . '/../Maintenance.php';
25
26		/**
27		* Maintenance script to fix bug 20757.
28		*
29		* @ingroup Maintenance ExternalStorage
30		*/
31		class FixBug20757 extends Maintenance {
32		public $batchSize = 10000;
33		public $mapCache = [];
34		public $mapCacheSize = 0;
35		public $maxMapCacheSize = 1000000;
36
37		function __construct() {
38		parent::__construct();
39		$this->addDescription( 'Script to fix bug 20757 assuming that blob_tracking is intact' );
40		$this->addOption( 'dry-run', 'Report only' );
41		$this->addOption( 'start', 'old_id to start at', false, true );
42		}
43
44		function execute() {
45		$dbr = $this->getDB( DB_REPLICA );
46		$dbw = $this->getDB( DB_MASTER );
47
48		$dryRun = $this->getOption( 'dry-run' );
49		if ( $dryRun ) {
50		print "Dry run only.\n";
51		}
52
53		$startId = $this->getOption( 'start', 0 );
54		$numGood = 0;
55		$numFixed = 0;
56		$numBad = 0;
57
58		$totalRevs = $dbr->selectField( 'text', 'MAX(old_id)', false, __METHOD__ );
59
60		// In MySQL 4.1+, the binary field old_text has a non-working LOWER() function
61		$lowerLeft = 'LOWER(CONVERT(LEFT(old_text,22) USING latin1))';
62
63		while ( true ) {
64		print "ID: $startId / $totalRevs\r";
65
66		$res = $dbr->select(
67		'text',
68		[ 'old_id', 'old_flags', 'old_text' ],
69		[
70		'old_id > ' . intval( $startId ),
71		'old_flags LIKE \'%object%\' AND old_flags NOT LIKE \'%external%\'',
72		"$lowerLeft = 'o:15:\"historyblobstub\"'",
73		],
74		__METHOD__,
75		[
76		'ORDER BY' => 'old_id',
77		'LIMIT' => $this->batchSize,
78		]
79		);
80
81		if ( !$res->numRows() ) {
82		break;
83		}
84
85		$secondaryIds = [];
86		$stubs = [];
87
88		foreach ( $res as $row ) {
89		$startId = $row->old_id;
90
91		// Basic sanity checks
92		$obj = unserialize( $row->old_text );
93		if ( $obj === false ) {
94		print "{$row->old_id}: unrecoverable: cannot unserialize\n";
95		++$numBad;
96		continue;
97		}
98
99		if ( !is_object( $obj ) ) {
100		print "{$row->old_id}: unrecoverable: unserialized to type " .
101		gettype( $obj ) . ", possible double-serialization\n";
102		++$numBad;
103		continue;
104		}
105
106		if ( strtolower( get_class( $obj ) ) !== 'historyblobstub' ) {
107		print "{$row->old_id}: unrecoverable: unexpected object class " .
108		get_class( $obj ) . "\n";
109		++$numBad;
110		continue;
111		}
112
113		// Process flags
114		$flags = explode( ',', $row->old_flags );
115		if ( in_array( 'utf-8', $flags ) \|\| in_array( 'utf8', $flags ) ) {
116		$legacyEncoding = false;
117		} else {
118		$legacyEncoding = true;
119		}
120
121		// Queue the stub for future batch processing
122		$id = intval( $obj->mOldId );
123		$secondaryIds[] = $id;
124		$stubs[$row->old_id] = [
125		'legacyEncoding' => $legacyEncoding,
126		'secondaryId' => $id,
127		'hash' => $obj->mHash,
128		];
129		}
130
131		$secondaryIds = array_unique( $secondaryIds );
132
133		if ( !count( $secondaryIds ) ) {
134		continue;
135		}
136
137		// Run the batch query on blob_tracking
138		$res = $dbr->select(
139		'blob_tracking',
140		'*',
141		[
142		'bt_text_id' => $secondaryIds,
143		],
144		__METHOD__
145		);
146		$trackedBlobs = [];
147		foreach ( $res as $row ) {
148		$trackedBlobs[$row->bt_text_id] = $row;
149		}
150
151		// Process the stubs
152		foreach ( $stubs as $primaryId => $stub ) {
153		$secondaryId = $stub['secondaryId'];
154		if ( !isset( $trackedBlobs[$secondaryId] ) ) {
155		// No tracked blob. Work out what went wrong
156		$secondaryRow = $dbr->selectRow(
157		'text',
158		[ 'old_flags', 'old_text' ],
159		[ 'old_id' => $secondaryId ],
160		__METHOD__
161		);
162		if ( !$secondaryRow ) {
163		print "$primaryId: unrecoverable: secondary row is missing\n";
164		++$numBad;
165		} elseif ( $this->isUnbrokenStub( $stub, $secondaryRow ) ) {
166		// Not broken yet, and not in the tracked clusters so it won't get
167		// broken by the current RCT run.
168		++$numGood;
169		} elseif ( strpos( $secondaryRow->old_flags, 'external' ) !== false ) {
170		print "$primaryId: unrecoverable: secondary gone to {$secondaryRow->old_text}\n";
171		++$numBad;
172		} else {
173		print "$primaryId: unrecoverable: miscellaneous corruption of secondary row\n";
174		++$numBad;
175		}
176		unset( $stubs[$primaryId] );
177		continue;
178		}
179		$trackRow = $trackedBlobs[$secondaryId];
180
181		// Check that the specified text really is available in the tracked source row
182		$url = "DB://{$trackRow->bt_cluster}/{$trackRow->bt_blob_id}/{$stub['hash']}";
183		$text = ExternalStore::fetchFromURL( $url );
184		if ( $text === false ) {
185		print "$primaryId: unrecoverable: source text missing\n";
186		++$numBad;
187		unset( $stubs[$primaryId] );
188		continue;
189		}
190		if ( md5( $text ) !== $stub['hash'] ) {
191		print "$primaryId: unrecoverable: content hashes do not match\n";
192		++$numBad;
193		unset( $stubs[$primaryId] );
194		continue;
195		}
196
197		// Find the page_id and rev_id
198		// The page is probably the same as the page of the secondary row
199		$pageId = intval( $trackRow->bt_page );
200		if ( !$pageId ) {
201		$revId = $pageId = 0;
202		} else {
203		$revId = $this->findTextIdInPage( $pageId, $primaryId );
204		if ( !$revId ) {
205		// Actually an orphan
206		$pageId = $revId = 0;
207		}
208		}
209
210		$newFlags = $stub['legacyEncoding'] ? 'external' : 'external,utf-8';
211
212		if ( !$dryRun ) {
213		// Reset the text row to point to the original copy
214		$this->beginTransaction( $dbw, __METHOD__ );
		0 ignored issues – show Bug introduced 2016-09-24 18:22 UTC by Report Bug Copy Issue Report It seems like `$dbw` defined by `$this->getDB(DB_MASTER)` on line `46` can be `null`; however, `Maintenance::beginTransaction()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
215		$dbw->update(
216		'text',
217		// SET
218		[
219		'old_flags' => $newFlags,
220		'old_text' => $url
221		],
222		// WHERE
223		[ 'old_id' => $primaryId ],
224		__METHOD__
225		);
226
227		// Add a blob_tracking row so that the new reference can be recompressed
228		// without needing to run trackBlobs.php again
229		$dbw->insert( 'blob_tracking',
230		[
231		'bt_page' => $pageId,
232		'bt_rev_id' => $revId,
233		'bt_text_id' => $primaryId,
234		'bt_cluster' => $trackRow->bt_cluster,
235		'bt_blob_id' => $trackRow->bt_blob_id,
236		'bt_cgz_hash' => $stub['hash'],
237		'bt_new_url' => null,
238		'bt_moved' => 0,
239		],
240		__METHOD__
241		);
242		$this->commitTransaction( $dbw, __METHOD__ );
		0 ignored issues – show Bug introduced 2016-09-24 18:22 UTC by Report Bug Copy Issue Report It seems like `$dbw` defined by `$this->getDB(DB_MASTER)` on line `46` can be `null`; however, `Maintenance::commitTransaction()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
243		$this->waitForSlaves();
244		}
245
246		print "$primaryId: resolved to $url\n";
247		++$numFixed;
248		}
249		}
250
251		print "\n";
252		print "Fixed: $numFixed\n";
253		print "Unrecoverable: $numBad\n";
254		print "Good stubs: $numGood\n";
255		}
256
257		function waitForSlaves() {
258		static $iteration = 0;
259		++$iteration;
260		if ( ++$iteration > 50 == 0 ) {
261		wfWaitForSlaves();
		0 ignored issues – show Deprecated Code introduced 2016-01-25 18:14 UTC by Report Bug Copy Issue Report The function `wfWaitForSlaves()` has been deprecated with message: since 1.27 Use LBFactory::waitForReplication This function has been deprecated. The supplier of the file has supplied an explanatory message. The explanatory message should give you some clue as to whether and when the function will be removed from the class and what other function to use instead. Loading history...
262		$iteration = 0;
263		}
264		}
265
266		function findTextIdInPage( $pageId, $textId ) {
267		$ids = $this->getRevTextMap( $pageId );
268		if ( !isset( $ids[$textId] ) ) {
269		return null;
270		} else {
271		return $ids[$textId];
272		}
273		}
274
275		function getRevTextMap( $pageId ) {
276		if ( !isset( $this->mapCache[$pageId] ) ) {
277		// Limit cache size
278		while ( $this->mapCacheSize > $this->maxMapCacheSize ) {
279		$key = key( $this->mapCache );
280		$this->mapCacheSize -= count( $this->mapCache[$key] );
281		unset( $this->mapCache[$key] );
282		}
283
284		$dbr = $this->getDB( DB_REPLICA );
285		$map = [];
286		$res = $dbr->select( 'revision',
287		[ 'rev_id', 'rev_text_id' ],
288		[ 'rev_page' => $pageId ],
289		__METHOD__
290		);
291		foreach ( $res as $row ) {
292		$map[$row->rev_text_id] = $row->rev_id;
293		}
294		$this->mapCache[$pageId] = $map;
295		$this->mapCacheSize += count( $map );
296		}
297
298		return $this->mapCache[$pageId];
299		}
300
301		/**
302		* This is based on part of HistoryBlobStub::getText().
303		* Determine if the text can be retrieved from the row in the normal way.
304		* @param array $stub
305		* @param stdClass $secondaryRow
306		* @return bool
307		*/
308		function isUnbrokenStub( $stub, $secondaryRow ) {
309		$flags = explode( ',', $secondaryRow->old_flags );
310		$text = $secondaryRow->old_text;
311		if ( in_array( 'external', $flags ) ) {
312		$url = $text;
313		MediaWiki\suppressWarnings();
314		list( /* $proto */, $path ) = explode( '://', $url, 2 );
315		MediaWiki\restoreWarnings();
316
317		if ( $path == "" ) {
318		return false;
319		}
320		$text = ExternalStore::fetchFromURL( $url );
321		}
322		if ( !in_array( 'object', $flags ) ) {
323		return false;
324		}
325
326	View Code Duplication	if ( in_array( 'gzip', $flags ) ) {
327		$obj = unserialize( gzinflate( $text ) );
328		} else {
329		$obj = unserialize( $text );
330		}
331
332		if ( !is_object( $obj ) ) {
333		// Correct for old double-serialization bug.
334		$obj = unserialize( $obj );
335		}
336
337		if ( !is_object( $obj ) ) {
338		return false;
339		}
340
341		$obj->uncompress();
342		$text = $obj->getItem( $stub['hash'] );
343
344		return $text !== false;
345		}
346		}
347
348		$maintClass = 'FixBug20757';
349		require_once RUN_MAINTENANCE_IF_MAIN;
350

wikimedia / mediawiki

FixBug20757::waitForSlaves() A last analyzed 2016-11-13 17:42 UTC

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

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FixBug20757::waitForSlaves() A
last analyzed 2016-11-13 17:42 UTC