3 use MediaWiki\MediaWikiServices
;
6 * ExtensionRegistry class
8 * The Registry loads JSON files, and uses a Processor
9 * to extract information from them. It also registers
10 * classes with the autoloader.
14 class ExtensionRegistry
{
17 * "requires" key that applies to MediaWiki core/$wgVersion
19 const MEDIAWIKI_CORE
= 'MediaWiki';
22 * Version of the highest supported manifest version
24 const MANIFEST_VERSION
= 2;
27 * Version of the oldest supported manifest version
29 const OLDEST_MANIFEST_VERSION
= 1;
32 * Bump whenever the registration cache needs resetting
34 const CACHE_VERSION
= 4;
37 * Special key that defines the merge strategy
41 const MERGE_STRATEGY
= '_merge_strategy';
49 * Array of loaded things, keyed by name, values are credits information
56 * List of paths that should be loaded
60 protected $queued = [];
63 * Whether we are done loading things
67 private $finished = false;
70 * Items in the JSON file that aren't being
75 protected $attributes = [];
78 * @var ExtensionRegistry
80 private static $instance;
83 * @return ExtensionRegistry
85 public static function getInstance() {
86 if ( self
::$instance === null ) {
87 self
::$instance = new self();
90 return self
::$instance;
93 public function __construct() {
94 // We use a try/catch because we don't want to fail here
95 // if $wgObjectCaches is not configured properly for APC setup
97 $this->cache
= MediaWikiServices
::getInstance()->getLocalServerObjectCache();
98 } catch ( MWException
$e ) {
99 $this->cache
= new EmptyBagOStuff();
104 * @param string $path Absolute path to the JSON file
106 public function queue( $path ) {
107 global $wgExtensionInfoMTime;
109 $mtime = $wgExtensionInfoMTime;
110 if ( $mtime === false ) {
111 if ( file_exists( $path ) ) {
112 $mtime = filemtime( $path );
114 throw new Exception( "$path does not exist!" );
117 $err = error_get_last();
118 throw new Exception( "Couldn't stat $path: {$err['message']}" );
121 $this->queued
[$path] = $mtime;
125 * @throws MWException If the queue is already marked as finished (no further things should
128 public function loadFromQueue() {
130 if ( !$this->queued
) {
134 if ( $this->finished
) {
135 throw new MWException(
136 "The following paths tried to load late: "
137 . implode( ', ', array_keys( $this->queued
) )
141 // A few more things to vary the cache on
143 'registration' => self
::CACHE_VERSION
,
144 'mediawiki' => $wgVersion
147 // See if this queue is in APC
150 md5( json_encode( $this->queued +
$versions ) )
152 $data = $this->cache
->get( $key );
154 $this->exportExtractedData( $data );
156 $data = $this->readFromQueue( $this->queued
);
157 $this->exportExtractedData( $data );
158 // Do this late since we don't want to extract it since we already
159 // did that, but it should be cached
160 $data['globals']['wgAutoloadClasses'] +
= $data['autoload'];
161 unset( $data['autoload'] );
162 $this->cache
->set( $key, $data, 60 * 60 * 24 );
168 * Get the current load queue. Not intended to be used
169 * outside of the installer.
173 public function getQueue() {
174 return $this->queued
;
178 * Clear the current load queue. Not intended to be used
179 * outside of the installer.
181 public function clearQueue() {
186 * After this is called, no more extensions can be loaded
190 public function finish() {
191 $this->finished
= true;
195 * Process a queue of extensions and return their extracted data
197 * @param array $queue keys are filenames, values are ignored
198 * @return array extracted info
201 public function readFromQueue( array $queue ) {
203 $autoloadClasses = [];
204 $autoloaderPaths = [];
205 $processor = new ExtensionProcessor();
207 $versionParser = new VersionChecker();
208 $versionParser->setCoreVersion( $wgVersion );
209 foreach ( $queue as $path => $mtime ) {
210 $json = file_get_contents( $path );
211 if ( $json === false ) {
212 throw new Exception( "Unable to read $path, does it exist?" );
214 $info = json_decode( $json, /* $assoc = */ true );
215 if ( !is_array( $info ) ) {
216 throw new Exception( "$path is not a valid JSON file." );
219 // Check any constraints against MediaWiki core
220 $requires = $processor->getRequirements( $info );
222 $versionCheck = $versionParser->checkArray(
223 [ $info['name'] => $requires ]
225 $incompatible = array_merge( $incompatible, $versionCheck );
226 if ( $versionCheck ) {
231 if ( !isset( $info['manifest_version'] ) ) {
232 // For backwards-compatability, assume a version of 1
233 $info['manifest_version'] = 1;
235 $version = $info['manifest_version'];
236 if ( $version < self
::OLDEST_MANIFEST_VERSION ||
$version > self
::MANIFEST_VERSION
) {
237 throw new Exception( "$path: unsupported manifest_version: {$version}" );
240 $autoload = $this->processAutoLoader( dirname( $path ), $info );
241 // Set up the autoloader now so custom processors will work
242 $GLOBALS['wgAutoloadClasses'] +
= $autoload;
243 $autoloadClasses +
= $autoload;
245 // Get extra paths for later inclusion
246 $autoloaderPaths = array_merge( $autoloaderPaths,
247 $processor->getExtraAutoloaderPaths( dirname( $path ), $info ) );
248 // Compatible, read and extract info
249 $processor->extractInfo( $path, $info, $version );
251 if ( $incompatible ) {
252 if ( count( $incompatible ) === 1 ) {
253 throw new Exception( $incompatible[0] );
255 throw new Exception( implode( "\n", $incompatible ) );
258 $data = $processor->getExtractedInfo();
259 // Need to set this so we can += to it later
260 $data['globals']['wgAutoloadClasses'] = [];
261 $data['autoload'] = $autoloadClasses;
262 $data['autoloaderPaths'] = $autoloaderPaths;
266 protected function exportExtractedData( array $info ) {
267 foreach ( $info['globals'] as $key => $val ) {
268 // If a merge strategy is set, read it and remove it from the value
269 // so it doesn't accidentally end up getting set.
270 if ( is_array( $val ) && isset( $val[self
::MERGE_STRATEGY
] ) ) {
271 $mergeStrategy = $val[self
::MERGE_STRATEGY
];
272 unset( $val[self
::MERGE_STRATEGY
] );
274 $mergeStrategy = 'array_merge';
277 // Optimistic: If the global is not set, or is an empty array, replace it entirely.
278 // Will be O(1) performance.
279 if ( !isset( $GLOBALS[$key] ) ||
( is_array( $GLOBALS[$key] ) && !$GLOBALS[$key] ) ) {
280 $GLOBALS[$key] = $val;
284 if ( !is_array( $GLOBALS[$key] ) ||
!is_array( $val ) ) {
285 // config setting that has already been overridden, don't set it
289 switch ( $mergeStrategy ) {
290 case 'array_merge_recursive':
291 $GLOBALS[$key] = array_merge_recursive( $GLOBALS[$key], $val );
293 case 'array_replace_recursive':
294 $GLOBALS[$key] = array_replace_recursive( $GLOBALS[$key], $val );
296 case 'array_plus_2d':
297 $GLOBALS[$key] = wfArrayPlus2d( $GLOBALS[$key], $val );
300 $GLOBALS[$key] +
= $val;
303 $GLOBALS[$key] = array_merge( $val, $GLOBALS[$key] );
306 throw new UnexpectedValueException( "Unknown merge strategy '$mergeStrategy'" );
310 foreach ( $info['defines'] as $name => $val ) {
311 define( $name, $val );
313 foreach ( $info['autoloaderPaths'] as $path ) {
317 $this->loaded +
= $info['credits'];
318 if ( $info['attributes'] ) {
319 if ( !$this->attributes
) {
320 $this->attributes
= $info['attributes'];
322 $this->attributes
= array_merge_recursive( $this->attributes
, $info['attributes'] );
326 foreach ( $info['callbacks'] as $name => $cb ) {
327 call_user_func( $cb, $info['credits'][$name] );
332 * Loads and processes the given JSON file without delay
334 * If some extensions are already queued, this will load
337 * @param string $path Absolute path to the JSON file
339 public function load( $path ) {
340 $this->loadFromQueue(); // First clear the queue
341 $this->queue( $path );
342 $this->loadFromQueue();
346 * Whether a thing has been loaded
347 * @param string $name
350 public function isLoaded( $name ) {
351 return isset( $this->loaded
[$name] );
355 * @param string $name
358 public function getAttribute( $name ) {
359 if ( isset( $this->attributes
[$name] ) ) {
360 return $this->attributes
[$name];
367 * Get information about all things
371 public function getAllThings() {
372 return $this->loaded
;
376 * Mark a thing as loaded
378 * @param string $name
379 * @param array $credits
381 protected function markLoaded( $name, array $credits ) {
382 $this->loaded
[$name] = $credits;
386 * Register classes with the autoloader
392 protected function processAutoLoader( $dir, array $info ) {
393 if ( isset( $info['AutoloadClasses'] ) ) {
394 // Make paths absolute, relative to the JSON file
395 return array_map( function( $file ) use ( $dir ) {
397 }, $info['AutoloadClasses'] );