MediaWiki  master
compareParserCache.php
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1 <?php
22 require_once __DIR__ . '/Maintenance.php';
23 
25 
30  public function __construct() {
31  parent::__construct();
32  $this->addDescription( 'Parse random pages and compare output to cache.' );
33  $this->addOption( 'namespace', 'Page namespace number', true, true );
34  $this->addOption( 'maxpages', 'Number of pages to try', true, true );
35  }
36 
37  public function execute() {
38  $pages = $this->getOption( 'maxpages' );
39 
40  $dbr = $this->getDB( DB_REPLICA );
41 
42  $totalsec = 0.0;
43  $scanned = 0;
44  $withcache = 0;
45  $withdiff = 0;
46  $parserCache = MediaWikiServices::getInstance()->getParserCache();
47  $renderer = MediaWikiServices::getInstance()->getRevisionRenderer();
48  while ( $pages-- > 0 ) {
49  $row = $dbr->selectRow( 'page',
50  // @todo Title::selectFields() or Title::getQueryInfo() or something
51  [
52  'page_namespace', 'page_title', 'page_id',
53  'page_len', 'page_is_redirect', 'page_latest',
54  ],
55  [
56  'page_namespace' => $this->getOption( 'namespace' ),
57  'page_is_redirect' => 0,
58  'page_random >= ' . wfRandom()
59  ],
60  __METHOD__,
61  [
62  'ORDER BY' => 'page_random',
63  ]
64  );
65 
66  if ( !$row ) {
67  continue;
68  }
69  ++$scanned;
70 
71  $title = Title::newFromRow( $row );
72  $page = WikiPage::factory( $title );
73  $revision = $page->getRevision()->getRevisionRecord();
74  $parserOptions = $page->makeParserOptions( 'canonical' );
75 
76  $parserOutputOld = $parserCache->get( $page, $parserOptions );
77 
78  if ( $parserOutputOld ) {
79  $t1 = microtime( true );
80  $parserOutputNew = $renderer->getRenderedRevision( $revision, $parserOptions )
81  ->getRevisionParserOutput();
82 
83  $sec = microtime( true ) - $t1;
84  $totalsec += $sec;
85 
86  $this->output( "Parsed '{$title->getPrefixedText()}' in $sec seconds.\n" );
87 
88  $this->output( "Found cache entry found for '{$title->getPrefixedText()}'..." );
89  $oldHtml = trim( preg_replace( '#<!-- .+-->#Us', '', $parserOutputOld->getText() ) );
90  $newHtml = trim( preg_replace( '#<!-- .+-->#Us', '', $parserOutputNew->getText() ) );
91  $diff = wfDiff( $oldHtml, $newHtml );
92  if ( strlen( $diff ) ) {
93  $this->output( "differences found:\n\n$diff\n\n" );
94  ++$withdiff;
95  } else {
96  $this->output( "No differences found.\n" );
97  }
98  ++$withcache;
99  } else {
100  $this->output( "No parser cache entry found for '{$title->getPrefixedText()}'.\n" );
101  }
102  }
103 
104  $ave = $totalsec ? $totalsec / $scanned : 0;
105  $this->output( "Checked $scanned pages; $withcache had prior cache entries.\n" );
106  $this->output( "Pages with differences found: $withdiff\n" );
107  $this->output( "Average parse time: $ave sec\n" );
108  }
109 }
110 
111 $maintClass = CompareParserCache::class;
112 require_once RUN_MAINTENANCE_IF_MAIN;
static factory(Title $title)
Create a WikiPage object of the appropriate class for the given title.
Definition: WikiPage.php:142
const RUN_MAINTENANCE_IF_MAIN
Definition: Maintenance.php:39
getOption( $name, $default=null)
Get an option, or return the default.
Abstract maintenance class for quickly writing and churning out maintenance scripts with minimal effo...
Definition: Maintenance.php:82
static newFromRow( $row)
Make a Title object from a DB row.
Definition: Title.php:518
addDescription( $text)
Set the description text.
wfDiff( $before, $after, $params='-u')
Returns unified plain-text diff of two texts.
output( $out, $channel=null)
Throw some output to the user.
wfRandom()
Get a random decimal value in the domain of [0, 1), in a way not likely to give duplicate values for ...
addOption( $name, $description, $required=false, $withArg=false, $shortName=false, $multiOccurrence=false)
Add a parameter to the script.
const DB_REPLICA
Definition: defines.php:25
getDB( $db, $groups=[], $dbDomain=false)
Returns a database to be used by current maintenance script.