MediaWiki REL1_32
LinksDeletionUpdate.php
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1<?php
23use Wikimedia\ScopedCallback;
25
31 protected $page;
33 protected $pageId;
35 protected $timestamp;
36
38 private $db;
39
46 function __construct( WikiPage $page, $pageId = null, $timestamp = null ) {
47 parent::__construct();
48
49 $this->page = $page;
50 if ( $pageId ) {
51 $this->pageId = $pageId; // page ID at time of deletion
52 } elseif ( $page->exists() ) {
53 $this->pageId = $page->getId();
54 } else {
55 throw new InvalidArgumentException( "Page ID not known. Page doesn't exist?" );
56 }
57
58 $this->timestamp = $timestamp ?: wfTimestampNow();
59 }
60
61 public function doUpdate() {
62 $services = MediaWikiServices::getInstance();
63 $config = $services->getMainConfig();
64 $lbFactory = $services->getDBLoadBalancerFactory();
65 $batchSize = $config->get( 'UpdateRowsPerQuery' );
66
67 // Page may already be deleted, so don't just getId()
68 $id = $this->pageId;
69
70 if ( $this->ticket ) {
71 // Make sure all links update threads see the changes of each other.
72 // This handles the case when updates have to batched into several COMMITs.
73 $scopedLock = LinksUpdate::acquirePageLock( $this->getDB(), $id );
74 if ( !$scopedLock ) {
75 throw new RuntimeException( "Could not acquire lock for page ID '{$id}'." );
76 }
77 }
78
79 $title = $this->page->getTitle();
80 $dbw = $this->getDB(); // convenience
81
82 // Delete restrictions for it
83 $dbw->delete( 'page_restrictions', [ 'pr_page' => $id ], __METHOD__ );
84
85 // Fix category table counts
86 $cats = $dbw->selectFieldValues(
87 'categorylinks',
88 'cl_to',
89 [ 'cl_from' => $id ],
90 __METHOD__
91 );
92 $catBatches = array_chunk( $cats, $batchSize );
93 foreach ( $catBatches as $catBatch ) {
94 $this->page->updateCategoryCounts( [], $catBatch, $id );
95 if ( count( $catBatches ) > 1 ) {
96 // Only sacrifice atomicity if necessary due to size
97 $lbFactory->commitAndWaitForReplication(
98 __METHOD__, $this->ticket, [ 'domain' => $dbw->getDomainID() ]
99 );
100 }
101 }
102
103 // Refresh counts on categories that should be empty now
104 if ( $title->getNamespace() === NS_CATEGORY ) {
105 // T166757: do the update after the main job DB commit
106 DeferredUpdates::addCallableUpdate( function () use ( $title ) {
107 $cat = Category::newFromName( $title->getDBkey() );
108 $cat->refreshCountsIfEmpty();
109 } );
110 }
111
112 $this->batchDeleteByPK(
113 'pagelinks',
114 [ 'pl_from' => $id ],
115 [ 'pl_from', 'pl_namespace', 'pl_title' ],
116 $batchSize
117 );
118 $this->batchDeleteByPK(
119 'imagelinks',
120 [ 'il_from' => $id ],
121 [ 'il_from', 'il_to' ],
122 $batchSize
123 );
124 $this->batchDeleteByPK(
125 'categorylinks',
126 [ 'cl_from' => $id ],
127 [ 'cl_from', 'cl_to' ],
128 $batchSize
129 );
130 $this->batchDeleteByPK(
131 'templatelinks',
132 [ 'tl_from' => $id ],
133 [ 'tl_from', 'tl_namespace', 'tl_title' ],
134 $batchSize
135 );
136 $this->batchDeleteByPK(
137 'externallinks',
138 [ 'el_from' => $id ],
139 [ 'el_id' ],
140 $batchSize
141 );
142 $this->batchDeleteByPK(
143 'langlinks',
144 [ 'll_from' => $id ],
145 [ 'll_from', 'll_lang' ],
146 $batchSize
147 );
148 $this->batchDeleteByPK(
149 'iwlinks',
150 [ 'iwl_from' => $id ],
151 [ 'iwl_from', 'iwl_prefix', 'iwl_title' ],
152 $batchSize
153 );
154
155 // Delete any redirect entry or page props entries
156 $dbw->delete( 'redirect', [ 'rd_from' => $id ], __METHOD__ );
157 $dbw->delete( 'page_props', [ 'pp_page' => $id ], __METHOD__ );
158
159 // Find recentchanges entries to clean up...
160 $rcIdsForTitle = $dbw->selectFieldValues(
161 'recentchanges',
162 'rc_id',
163 [
164 'rc_type != ' . RC_LOG,
165 'rc_namespace' => $title->getNamespace(),
166 'rc_title' => $title->getDBkey(),
167 'rc_timestamp < ' .
168 $dbw->addQuotes( $dbw->timestamp( $this->timestamp ) )
169 ],
170 __METHOD__
171 );
172 $rcIdsForPage = $dbw->selectFieldValues(
173 'recentchanges',
174 'rc_id',
175 [ 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ],
176 __METHOD__
177 );
178
179 // T98706: delete by PK to avoid lock contention with RC delete log insertions
180 $rcIdBatches = array_chunk( array_merge( $rcIdsForTitle, $rcIdsForPage ), $batchSize );
181 foreach ( $rcIdBatches as $rcIdBatch ) {
182 $dbw->delete( 'recentchanges', [ 'rc_id' => $rcIdBatch ], __METHOD__ );
183 if ( count( $rcIdBatches ) > 1 ) {
184 $lbFactory->commitAndWaitForReplication(
185 __METHOD__, $this->ticket, [ 'domain' => $dbw->getDomainID() ]
186 );
187 }
188 }
189
190 // Commit and release the lock (if set)
191 ScopedCallback::consume( $scopedLock );
192 }
193
194 private function batchDeleteByPK( $table, array $conds, array $pk, $bSize ) {
195 $services = MediaWikiServices::getInstance();
196 $lbFactory = $services->getDBLoadBalancerFactory();
197 $dbw = $this->getDB(); // convenience
198
199 $res = $dbw->select( $table, $pk, $conds, __METHOD__ );
200
201 $pkDeleteConds = [];
202 foreach ( $res as $row ) {
203 $pkDeleteConds[] = $dbw->makeList( (array)$row, LIST_AND );
204 if ( count( $pkDeleteConds ) >= $bSize ) {
205 $dbw->delete( $table, $dbw->makeList( $pkDeleteConds, LIST_OR ), __METHOD__ );
206 $lbFactory->commitAndWaitForReplication(
207 __METHOD__, $this->ticket, [ 'domain' => $dbw->getDomainID() ]
208 );
209 $pkDeleteConds = [];
210 }
211 }
212
213 if ( $pkDeleteConds ) {
214 $dbw->delete( $table, $dbw->makeList( $pkDeleteConds, LIST_OR ), __METHOD__ );
215 }
216 }
217
218 protected function getDB() {
219 if ( !$this->db ) {
220 $this->db = wfGetDB( DB_MASTER );
221 }
222
223 return $this->db;
224 }
225
226 public function getAsJobSpecification() {
227 return [
228 'wiki' => WikiMap::getWikiIdFromDomain( $this->getDB()->getDomainID() ),
229 'job' => new JobSpecification(
230 'deleteLinks',
231 [ 'pageId' => $this->pageId, 'timestamp' => $this->timestamp ],
232 [ 'removeDuplicates' => true ],
233 $this->page->getTitle()
234 )
235 ];
236 }
237}
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
target page
wfTimestampNow()
Convenience function; returns MediaWiki timestamp for the present time.
wfGetDB( $db, $groups=[], $wiki=false)
Get a Database object.
Abstract base class for update jobs that do something with some secondary data extracted from article...
Job queue task description base code.
Update object handling the cleanup of links tables after a page was deleted.
doUpdate()
Perform the actual work.
batchDeleteByPK( $table, array $conds, array $pk, $bSize)
__construct(WikiPage $page, $pageId=null, $timestamp=null)
MediaWikiServices is the service locator for the application scope of MediaWiki.
static getWikiIdFromDomain( $domain)
Get the wiki ID of a database domain.
Definition WikiMap.php:252
Class representing a MediaWiki article and history.
Definition WikiPage.php:44
$res
Definition database.txt:21
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
const LIST_OR
Definition Defines.php:46
const RC_LOG
Definition Defines.php:144
const LIST_AND
Definition Defines.php:43
const NS_CATEGORY
Definition Defines.php:78
namespace and then decline to actually register it file or subcat img or subcat $title
Definition hooks.txt:994
static configuration should be added through ResourceLoaderGetConfigVars instead can be used to get the real title e g db for database replication lag or jobqueue for job queue size converted to pseudo seconds It is possible to add more fields and they will be returned to the user in the API response after the basic globals have been set but before ordinary actions take place or wrap services the preferred way to define a new service is the $wgServiceWiringFiles array $services
Definition hooks.txt:2335
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition injection.txt:37
Interface that marks a DataUpdate as enqueuable via the JobQueue.
Basic database interface for live and lazy-loaded relation database handles.
Definition IDatabase.php:38
The wiki should then use memcached to cache various data To use multiple just add more items to the array To increase the weight of a make its entry a array("192.168.0.1:11211", 2))
const DB_MASTER
Definition defines.php:26