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<?php
/**
* Local repository that stores files in the local filesystem and registers them
* in the wiki's own database.
*
* @file
* @ingroup FileRepo
*/
/**
* A repository that stores files in the local filesystem and registers them
* in the wiki's own database. This is the most commonly used repository class.
* @ingroup FileRepo
*/
class LocalRepo extends FSRepo {
var $fileFactory = array( 'LocalFile', 'newFromTitle' );
var $fileFactoryKey = array( 'LocalFile', 'newFromKey' );
var $oldFileFactory = array( 'OldLocalFile', 'newFromTitle' );
var $oldFileFactoryKey = array( 'OldLocalFile', 'newFromKey' );
var $fileFromRowFactory = array( 'LocalFile', 'newFromRow' );
var $oldFileFromRowFactory = array( 'OldLocalFile', 'newFromRow' );
/**
* @throws MWException
* @param $row
* @return File
*/
function newFileFromRow( $row ) {
if ( isset( $row->img_name ) ) {
return call_user_func( $this->fileFromRowFactory, $row, $this );
} elseif ( isset( $row->oi_name ) ) {
return call_user_func( $this->oldFileFromRowFactory, $row, $this );
} else {
throw new MWException( __METHOD__.': invalid row' );
}
}
/**
* @param $title
* @param $archiveName
* @return OldLocalFile
*/
function newFromArchiveName( $title, $archiveName ) {
return OldLocalFile::newFromArchiveName( $title, $this, $archiveName );
}
/**
* Delete files in the deleted directory if they are not referenced in the
* filearchive table. This needs to be done in the repo because it needs to
* interleave database locks with file operations, which is potentially a
* remote operation.
*
* @param $storageKeys array
*
* @return FileRepoStatus
*/
function cleanupDeletedBatch( $storageKeys ) {
$root = $this->getZonePath( 'deleted' );
$dbw = $this->getMasterDB();
$status = $this->newGood();
$storageKeys = array_unique( $storageKeys );
foreach ( $storageKeys as $key ) {
$hashPath = $this->getDeletedHashPath( $key );
$path = "$root/$hashPath$key";
$dbw->begin();
$inuse = $dbw->selectField( 'filearchive', '1',
array( 'fa_storage_group' => 'deleted', 'fa_storage_key' => $key ),
__METHOD__, array( 'FOR UPDATE' ) );
if( !$inuse ) {
$sha1 = self::getHashFromKey( $key );
$ext = substr( $key, strcspn( $key, '.' ) + 1 );
$ext = File::normalizeExtension($ext);
$inuse = $dbw->selectField( 'oldimage', '1',
array( 'oi_sha1' => $sha1,
'oi_archive_name ' . $dbw->buildLike( $dbw->anyString(), ".$ext" ),
$dbw->bitAnd('oi_deleted', File::DELETED_FILE) => File::DELETED_FILE ),
__METHOD__, array( 'FOR UPDATE' ) );
}
if ( !$inuse ) {
wfDebug( __METHOD__ . ": deleting $key\n" );
wfSuppressWarnings();
$unlink = unlink( $path );
wfRestoreWarnings();
if ( !$unlink ) {
$status->error( 'undelete-cleanup-error', $path );
$status->failCount++;
}
} else {
wfDebug( __METHOD__ . ": $key still in use\n" );
$status->successCount++;
}
$dbw->commit();
}
return $status;
}
/**
* Gets the SHA1 hash from a storage key
*
* @param string $key
* @return string
*/
public static function getHashFromKey( $key ) {
return strtok( $key, '.' );
}
/**
* Checks if there is a redirect named as $title
*
* @param $title Title of file
*/
function checkRedirect( $title ) {
global $wgMemc;
if( is_string( $title ) ) {
$title = Title::newFromText( $title );
}
if( $title instanceof Title && $title->getNamespace() == NS_MEDIA ) {
$title = Title::makeTitle( NS_FILE, $title->getText() );
}
$memcKey = $this->getSharedCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
if ( $memcKey === false ) {
$memcKey = $this->getLocalCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
$expiry = 300; // no invalidation, 5 minutes
} else {
$expiry = 86400; // has invalidation, 1 day
}
$cachedValue = $wgMemc->get( $memcKey );
if ( $cachedValue === ' ' || $cachedValue === '' ) {
// Does not exist
return false;
} elseif ( strval( $cachedValue ) !== '' ) {
return Title::newFromText( $cachedValue, NS_FILE );
} // else $cachedValue is false or null: cache miss
$id = $this->getArticleID( $title );
if( !$id ) {
$wgMemc->set( $memcKey, " ", $expiry );
return false;
}
$dbr = $this->getSlaveDB();
$row = $dbr->selectRow(
'redirect',
array( 'rd_title', 'rd_namespace' ),
array( 'rd_from' => $id ),
__METHOD__
);
if( $row && $row->rd_namespace == NS_FILE ) {
$targetTitle = Title::makeTitle( $row->rd_namespace, $row->rd_title );
$wgMemc->set( $memcKey, $targetTitle->getDBkey(), $expiry );
return $targetTitle;
} else {
$wgMemc->set( $memcKey, '', $expiry );
return false;
}
}
/**
* Function link Title::getArticleID().
* We can't say Title object, what database it should use, so we duplicate that function here.
* @param $title Title
*/
protected function getArticleID( $title ) {
if( !$title instanceof Title ) {
return 0;
}
$dbr = $this->getSlaveDB();
$id = $dbr->selectField(
'page', // Table
'page_id', //Field
array( //Conditions
'page_namespace' => $title->getNamespace(),
'page_title' => $title->getDBkey(),
),
__METHOD__ //Function name
);
return $id;
}
/**
* Get an array or iterator of file objects for files that have a given
* SHA-1 content hash.
*/
function findBySha1( $hash ) {
$dbr = $this->getSlaveDB();
$res = $dbr->select(
'image',
LocalFile::selectFields(),
array( 'img_sha1' => $hash )
);
$result = array();
foreach ( $res as $row ) {
$result[] = $this->newFileFromRow( $row );
}
$res->free();
return $result;
}
/**
* Get a connection to the slave DB
*/
function getSlaveDB() {
return wfGetDB( DB_SLAVE );
}
/**
* Get a connection to the master DB
*/
function getMasterDB() {
return wfGetDB( DB_MASTER );
}
/**
* Get a key on the primary cache for this repository.
* Returns false if the repository's cache is not accessible at this site.
* The parameters are the parts of the key, as for wfMemcKey().
*/
function getSharedCacheKey( /*...*/ ) {
$args = func_get_args();
return call_user_func_array( 'wfMemcKey', $args );
}
/**
* Invalidates image redirect cache related to that image
*
* @param $title Title of page
*/
function invalidateImageRedirect( $title ) {
global $wgMemc;
$memcKey = $this->getSharedCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
if ( $memcKey ) {
$wgMemc->delete( $memcKey );
}
}
}
|
