MediaWiki  master
FileContentsHasher.php
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1 <?php
23 
25  protected $cache;
26 
28  private static $instance;
29 
30  public function __construct() {
31  $this->cache = ObjectCache::getLocalServerInstance( 'hash' );
32  }
33 
39  public static function singleton() {
40  if ( !self::$instance ) {
41  self::$instance = new self;
42  }
43 
44  return self::$instance;
45  }
46 
56  public function getFileContentsHashInternal( $filePath, $algo = 'md4' ) {
57  $mtime = filemtime( $filePath );
58  if ( $mtime === false ) {
59  return false;
60  }
61 
62  $cacheKey = $this->cache->makeGlobalKey( __CLASS__, $filePath, $mtime, $algo );
63  $hash = $this->cache->get( $cacheKey );
64 
65  if ( $hash ) {
66  return $hash;
67  }
68 
69  $contents = file_get_contents( $filePath );
70  if ( $contents === false ) {
71  return false;
72  }
73 
74  $hash = hash( $algo, $contents );
75  $this->cache->set( $cacheKey, $hash, 60 * 60 * 24 ); // 24h
76 
77  return $hash;
78  }
79 
89  public static function getFileContentsHash( $filePaths, $algo = 'md4' ) {
90  $instance = self::singleton();
91 
92  if ( !is_array( $filePaths ) ) {
93  $filePaths = (array)$filePaths;
94  }
95 
96  Wikimedia\suppressWarnings();
97 
98  if ( count( $filePaths ) === 1 ) {
99  $hash = $instance->getFileContentsHashInternal( $filePaths[0], $algo );
100  Wikimedia\restoreWarnings();
101  return $hash;
102  }
103 
104  sort( $filePaths );
105  $hashes = array_map( function ( $filePath ) use ( $instance, $algo ) {
106  return $instance->getFileContentsHashInternal( $filePath, $algo ) ?: '';
107  }, $filePaths );
108 
109  Wikimedia\restoreWarnings();
110 
111  $hashes = implode( '', $hashes );
112  return $hashes ? hash( $algo, $hashes ) : false;
113  }
114 }
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))
static getFileContentsHash( $filePaths, $algo='md4')
Get a hash of the combined contents of one or more files, either by retrieving a previously-computed ...
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
you have access to all of the normal MediaWiki so you can get a DB use the cache
Definition: maintenance.txt:52
getFileContentsHashInternal( $filePath, $algo='md4')
Get a hash of a file&#39;s contents, either by retrieving a previously- computed hash from the cache...
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:35
static FileContentsHasher $instance
static singleton()
Get the singleton instance of this class.
static getLocalServerInstance( $fallback=CACHE_NONE)
Factory function for CACHE_ACCEL (referenced from DefaultSettings.php)