3 * Base class for all backends using particular storage medium.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
21 * @ingroup FileBackend
22 * @author Aaron Schulz
26 * @brief Base class for all backends using particular storage medium.
28 * This class defines the methods as abstract that subclasses must implement.
29 * Outside callers should *not* use functions with "Internal" in the name.
31 * The FileBackend operations are implemented using basic functions
32 * such as storeInternal(), copyInternal(), deleteInternal() and the like.
33 * This class is also responsible for path resolution and sanitization.
35 * @ingroup FileBackend
38 abstract class FileBackendStore
extends FileBackend
{
39 /** @var WANObjectCache */
41 /** @var ProcessCacheLRU Map of paths to small (RAM/disk) cache items */
42 protected $cheapCache;
43 /** @var ProcessCacheLRU Map of paths to large (RAM/disk) cache items */
44 protected $expensiveCache;
46 /** @var array Map of container names to sharding config */
47 protected $shardViaHashLevels = [];
49 /** @var callable Method to get the MIME type of files */
50 protected $mimeCallback;
52 protected $maxFileSize = 4294967296; // integer bytes (4GiB)
54 const CACHE_TTL
= 10; // integer; TTL in seconds for process cache entries
55 const CACHE_CHEAP_SIZE
= 500; // integer; max entries in "cheap cache"
56 const CACHE_EXPENSIVE_SIZE
= 5; // integer; max entries in "expensive cache"
59 * @see FileBackend::__construct()
60 * Additional $config params include:
61 * - wanCache : WANObjectCache object to use for persistent caching.
62 * - mimeCallback : Callback that takes (storage path, content, file system path) and
63 * returns the MIME type of the file or 'unknown/unknown'. The file
64 * system path parameter should be used if the content one is null.
66 * @param array $config
68 public function __construct( array $config ) {
69 parent
::__construct( $config );
70 $this->mimeCallback
= isset( $config['mimeCallback'] )
71 ?
$config['mimeCallback']
73 $this->memCache
= WANObjectCache
::newEmpty(); // disabled by default
74 $this->cheapCache
= new ProcessCacheLRU( self
::CACHE_CHEAP_SIZE
);
75 $this->expensiveCache
= new ProcessCacheLRU( self
::CACHE_EXPENSIVE_SIZE
);
79 * Get the maximum allowable file size given backend
80 * medium restrictions and basic performance constraints.
81 * Do not call this function from places outside FileBackend and FileOp.
85 final public function maxFileSizeInternal() {
86 return $this->maxFileSize
;
90 * Check if a file can be created or changed at a given storage path.
91 * FS backends should check if the parent directory exists, files can be
92 * written under it, and that any file already there is writable.
93 * Backends using key/value stores should check if the container exists.
95 * @param string $storagePath
98 abstract public function isPathUsableInternal( $storagePath );
101 * Create a file in the backend with the given contents.
102 * This will overwrite any file that exists at the destination.
103 * Do not call this function from places outside FileBackend and FileOp.
106 * - content : the raw file contents
107 * - dst : destination storage path
108 * - headers : HTTP header name/value map
109 * - async : StatusValue will be returned immediately if supported.
110 * If the StatusValue is OK, then its value field will be
111 * set to a FileBackendStoreOpHandle object.
112 * - dstExists : Whether a file exists at the destination (optimization).
113 * Callers can use "false" if no existing file is being changed.
115 * @param array $params
116 * @return StatusValue
118 final public function createInternal( array $params ) {
119 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
120 if ( strlen( $params['content'] ) > $this->maxFileSizeInternal() ) {
121 $status = $this->newStatus( 'backend-fail-maxsize',
122 $params['dst'], $this->maxFileSizeInternal() );
124 $status = $this->doCreateInternal( $params );
125 $this->clearCache( [ $params['dst'] ] );
126 if ( !isset( $params['dstExists'] ) ||
$params['dstExists'] ) {
127 $this->deleteFileCache( $params['dst'] ); // persistent cache
135 * @see FileBackendStore::createInternal()
136 * @param array $params
137 * @return StatusValue
139 abstract protected function doCreateInternal( array $params );
142 * Store a file into the backend from a file on disk.
143 * This will overwrite any file that exists at the destination.
144 * Do not call this function from places outside FileBackend and FileOp.
147 * - src : source path on disk
148 * - dst : destination storage path
149 * - headers : HTTP header name/value map
150 * - async : StatusValue will be returned immediately if supported.
151 * If the StatusValue is OK, then its value field will be
152 * set to a FileBackendStoreOpHandle object.
153 * - dstExists : Whether a file exists at the destination (optimization).
154 * Callers can use "false" if no existing file is being changed.
156 * @param array $params
157 * @return StatusValue
159 final public function storeInternal( array $params ) {
160 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
161 if ( filesize( $params['src'] ) > $this->maxFileSizeInternal() ) {
162 $status = $this->newStatus( 'backend-fail-maxsize',
163 $params['dst'], $this->maxFileSizeInternal() );
165 $status = $this->doStoreInternal( $params );
166 $this->clearCache( [ $params['dst'] ] );
167 if ( !isset( $params['dstExists'] ) ||
$params['dstExists'] ) {
168 $this->deleteFileCache( $params['dst'] ); // persistent cache
176 * @see FileBackendStore::storeInternal()
177 * @param array $params
178 * @return StatusValue
180 abstract protected function doStoreInternal( array $params );
183 * Copy a file from one storage path to another in the backend.
184 * This will overwrite any file that exists at the destination.
185 * Do not call this function from places outside FileBackend and FileOp.
188 * - src : source storage path
189 * - dst : destination storage path
190 * - ignoreMissingSource : do nothing if the source file does not exist
191 * - headers : HTTP header name/value map
192 * - async : StatusValue will be returned immediately if supported.
193 * If the StatusValue is OK, then its value field will be
194 * set to a FileBackendStoreOpHandle object.
195 * - dstExists : Whether a file exists at the destination (optimization).
196 * Callers can use "false" if no existing file is being changed.
198 * @param array $params
199 * @return StatusValue
201 final public function copyInternal( array $params ) {
202 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
203 $status = $this->doCopyInternal( $params );
204 $this->clearCache( [ $params['dst'] ] );
205 if ( !isset( $params['dstExists'] ) ||
$params['dstExists'] ) {
206 $this->deleteFileCache( $params['dst'] ); // persistent cache
213 * @see FileBackendStore::copyInternal()
214 * @param array $params
215 * @return StatusValue
217 abstract protected function doCopyInternal( array $params );
220 * Delete a file at the storage path.
221 * Do not call this function from places outside FileBackend and FileOp.
224 * - src : source storage path
225 * - ignoreMissingSource : do nothing if the source file does not exist
226 * - async : StatusValue will be returned immediately if supported.
227 * If the StatusValue is OK, then its value field will be
228 * set to a FileBackendStoreOpHandle object.
230 * @param array $params
231 * @return StatusValue
233 final public function deleteInternal( array $params ) {
234 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
235 $status = $this->doDeleteInternal( $params );
236 $this->clearCache( [ $params['src'] ] );
237 $this->deleteFileCache( $params['src'] ); // persistent cache
242 * @see FileBackendStore::deleteInternal()
243 * @param array $params
244 * @return StatusValue
246 abstract protected function doDeleteInternal( array $params );
249 * Move a file from one storage path to another in the backend.
250 * This will overwrite any file that exists at the destination.
251 * Do not call this function from places outside FileBackend and FileOp.
254 * - src : source storage path
255 * - dst : destination storage path
256 * - ignoreMissingSource : do nothing if the source file does not exist
257 * - headers : HTTP header name/value map
258 * - async : StatusValue will be returned immediately if supported.
259 * If the StatusValue is OK, then its value field will be
260 * set to a FileBackendStoreOpHandle object.
261 * - dstExists : Whether a file exists at the destination (optimization).
262 * Callers can use "false" if no existing file is being changed.
264 * @param array $params
265 * @return StatusValue
267 final public function moveInternal( array $params ) {
268 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
269 $status = $this->doMoveInternal( $params );
270 $this->clearCache( [ $params['src'], $params['dst'] ] );
271 $this->deleteFileCache( $params['src'] ); // persistent cache
272 if ( !isset( $params['dstExists'] ) ||
$params['dstExists'] ) {
273 $this->deleteFileCache( $params['dst'] ); // persistent cache
280 * @see FileBackendStore::moveInternal()
281 * @param array $params
282 * @return StatusValue
284 protected function doMoveInternal( array $params ) {
285 unset( $params['async'] ); // two steps, won't work here :)
286 $nsrc = FileBackend
::normalizeStoragePath( $params['src'] );
287 $ndst = FileBackend
::normalizeStoragePath( $params['dst'] );
288 // Copy source to dest
289 $status = $this->copyInternal( $params );
290 if ( $nsrc !== $ndst && $status->isOK() ) {
291 // Delete source (only fails due to races or network problems)
292 $status->merge( $this->deleteInternal( [ 'src' => $params['src'] ] ) );
293 $status->setResult( true, $status->value
); // ignore delete() errors
300 * Alter metadata for a file at the storage path.
301 * Do not call this function from places outside FileBackend and FileOp.
304 * - src : source storage path
305 * - headers : HTTP header name/value map
306 * - async : StatusValue will be returned immediately if supported.
307 * If the StatusValue is OK, then its value field will be
308 * set to a FileBackendStoreOpHandle object.
310 * @param array $params
311 * @return StatusValue
313 final public function describeInternal( array $params ) {
314 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
315 if ( count( $params['headers'] ) ) {
316 $status = $this->doDescribeInternal( $params );
317 $this->clearCache( [ $params['src'] ] );
318 $this->deleteFileCache( $params['src'] ); // persistent cache
320 $status = $this->newStatus(); // nothing to do
327 * @see FileBackendStore::describeInternal()
328 * @param array $params
329 * @return StatusValue
331 protected function doDescribeInternal( array $params ) {
332 return $this->newStatus();
336 * No-op file operation that does nothing.
337 * Do not call this function from places outside FileBackend and FileOp.
339 * @param array $params
340 * @return StatusValue
342 final public function nullInternal( array $params ) {
343 return $this->newStatus();
346 final public function concatenate( array $params ) {
347 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
348 $status = $this->newStatus();
350 // Try to lock the source files for the scope of this function
351 $scopeLockS = $this->getScopedFileLocks( $params['srcs'], LockManager
::LOCK_UW
, $status );
352 if ( $status->isOK() ) {
353 // Actually do the file concatenation...
354 $start_time = microtime( true );
355 $status->merge( $this->doConcatenate( $params ) );
356 $sec = microtime( true ) - $start_time;
357 if ( !$status->isOK() ) {
358 $this->logger
->error( get_class( $this ) . "-{$this->name}" .
359 " failed to concatenate " . count( $params['srcs'] ) . " file(s) [$sec sec]" );
367 * @see FileBackendStore::concatenate()
368 * @param array $params
369 * @return StatusValue
371 protected function doConcatenate( array $params ) {
372 $status = $this->newStatus();
373 $tmpPath = $params['dst']; // convenience
374 unset( $params['latest'] ); // sanity
376 // Check that the specified temp file is valid...
377 MediaWiki\
suppressWarnings();
378 $ok = ( is_file( $tmpPath ) && filesize( $tmpPath ) == 0 );
379 MediaWiki\restoreWarnings
();
380 if ( !$ok ) { // not present or not empty
381 $status->fatal( 'backend-fail-opentemp', $tmpPath );
386 // Get local FS versions of the chunks needed for the concatenation...
387 $fsFiles = $this->getLocalReferenceMulti( $params );
388 foreach ( $fsFiles as $path => &$fsFile ) {
389 if ( !$fsFile ) { // chunk failed to download?
390 $fsFile = $this->getLocalReference( [ 'src' => $path ] );
391 if ( !$fsFile ) { // retry failed?
392 $status->fatal( 'backend-fail-read', $path );
398 unset( $fsFile ); // unset reference so we can reuse $fsFile
400 // Get a handle for the destination temp file
401 $tmpHandle = fopen( $tmpPath, 'ab' );
402 if ( $tmpHandle === false ) {
403 $status->fatal( 'backend-fail-opentemp', $tmpPath );
408 // Build up the temp file using the source chunks (in order)...
409 foreach ( $fsFiles as $virtualSource => $fsFile ) {
410 // Get a handle to the local FS version
411 $sourceHandle = fopen( $fsFile->getPath(), 'rb' );
412 if ( $sourceHandle === false ) {
413 fclose( $tmpHandle );
414 $status->fatal( 'backend-fail-read', $virtualSource );
418 // Append chunk to file (pass chunk size to avoid magic quotes)
419 if ( !stream_copy_to_stream( $sourceHandle, $tmpHandle ) ) {
420 fclose( $sourceHandle );
421 fclose( $tmpHandle );
422 $status->fatal( 'backend-fail-writetemp', $tmpPath );
426 fclose( $sourceHandle );
428 if ( !fclose( $tmpHandle ) ) {
429 $status->fatal( 'backend-fail-closetemp', $tmpPath );
434 clearstatcache(); // temp file changed
439 final protected function doPrepare( array $params ) {
440 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
441 $status = $this->newStatus();
443 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
444 if ( $dir === null ) {
445 $status->fatal( 'backend-fail-invalidpath', $params['dir'] );
447 return $status; // invalid storage path
450 if ( $shard !== null ) { // confined to a single container/shard
451 $status->merge( $this->doPrepareInternal( $fullCont, $dir, $params ) );
452 } else { // directory is on several shards
453 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
454 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
455 foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
456 $status->merge( $this->doPrepareInternal( "{$fullCont}{$suffix}", $dir, $params ) );
464 * @see FileBackendStore::doPrepare()
465 * @param string $container
467 * @param array $params
468 * @return StatusValue
470 protected function doPrepareInternal( $container, $dir, array $params ) {
471 return $this->newStatus();
474 final protected function doSecure( array $params ) {
475 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
476 $status = $this->newStatus();
478 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
479 if ( $dir === null ) {
480 $status->fatal( 'backend-fail-invalidpath', $params['dir'] );
482 return $status; // invalid storage path
485 if ( $shard !== null ) { // confined to a single container/shard
486 $status->merge( $this->doSecureInternal( $fullCont, $dir, $params ) );
487 } else { // directory is on several shards
488 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
489 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
490 foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
491 $status->merge( $this->doSecureInternal( "{$fullCont}{$suffix}", $dir, $params ) );
499 * @see FileBackendStore::doSecure()
500 * @param string $container
502 * @param array $params
503 * @return StatusValue
505 protected function doSecureInternal( $container, $dir, array $params ) {
506 return $this->newStatus();
509 final protected function doPublish( array $params ) {
510 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
511 $status = $this->newStatus();
513 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
514 if ( $dir === null ) {
515 $status->fatal( 'backend-fail-invalidpath', $params['dir'] );
517 return $status; // invalid storage path
520 if ( $shard !== null ) { // confined to a single container/shard
521 $status->merge( $this->doPublishInternal( $fullCont, $dir, $params ) );
522 } else { // directory is on several shards
523 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
524 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
525 foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
526 $status->merge( $this->doPublishInternal( "{$fullCont}{$suffix}", $dir, $params ) );
534 * @see FileBackendStore::doPublish()
535 * @param string $container
537 * @param array $params
538 * @return StatusValue
540 protected function doPublishInternal( $container, $dir, array $params ) {
541 return $this->newStatus();
544 final protected function doClean( array $params ) {
545 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
546 $status = $this->newStatus();
548 // Recursive: first delete all empty subdirs recursively
549 if ( !empty( $params['recursive'] ) && !$this->directoriesAreVirtual() ) {
550 $subDirsRel = $this->getTopDirectoryList( [ 'dir' => $params['dir'] ] );
551 if ( $subDirsRel !== null ) { // no errors
552 foreach ( $subDirsRel as $subDirRel ) {
553 $subDir = $params['dir'] . "/{$subDirRel}"; // full path
554 $status->merge( $this->doClean( [ 'dir' => $subDir ] +
$params ) );
556 unset( $subDirsRel ); // free directory for rmdir() on Windows (for FS backends)
560 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
561 if ( $dir === null ) {
562 $status->fatal( 'backend-fail-invalidpath', $params['dir'] );
564 return $status; // invalid storage path
567 // Attempt to lock this directory...
568 $filesLockEx = [ $params['dir'] ];
569 $scopedLockE = $this->getScopedFileLocks( $filesLockEx, LockManager
::LOCK_EX
, $status );
570 if ( !$status->isOK() ) {
571 return $status; // abort
574 if ( $shard !== null ) { // confined to a single container/shard
575 $status->merge( $this->doCleanInternal( $fullCont, $dir, $params ) );
576 $this->deleteContainerCache( $fullCont ); // purge cache
577 } else { // directory is on several shards
578 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
579 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
580 foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
581 $status->merge( $this->doCleanInternal( "{$fullCont}{$suffix}", $dir, $params ) );
582 $this->deleteContainerCache( "{$fullCont}{$suffix}" ); // purge cache
590 * @see FileBackendStore::doClean()
591 * @param string $container
593 * @param array $params
594 * @return StatusValue
596 protected function doCleanInternal( $container, $dir, array $params ) {
597 return $this->newStatus();
600 final public function fileExists( array $params ) {
601 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
602 $stat = $this->getFileStat( $params );
604 return ( $stat === null ) ?
null : (bool)$stat; // null => failure
607 final public function getFileTimestamp( array $params ) {
608 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
609 $stat = $this->getFileStat( $params );
611 return $stat ?
$stat['mtime'] : false;
614 final public function getFileSize( array $params ) {
615 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
616 $stat = $this->getFileStat( $params );
618 return $stat ?
$stat['size'] : false;
621 final public function getFileStat( array $params ) {
622 $path = self
::normalizeStoragePath( $params['src'] );
623 if ( $path === null ) {
624 return false; // invalid storage path
626 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
627 $latest = !empty( $params['latest'] ); // use latest data?
628 if ( !$latest && !$this->cheapCache
->has( $path, 'stat', self
::CACHE_TTL
) ) {
629 $this->primeFileCache( [ $path ] ); // check persistent cache
631 if ( $this->cheapCache
->has( $path, 'stat', self
::CACHE_TTL
) ) {
632 $stat = $this->cheapCache
->get( $path, 'stat' );
633 // If we want the latest data, check that this cached
634 // value was in fact fetched with the latest available data.
635 if ( is_array( $stat ) ) {
636 if ( !$latest ||
$stat['latest'] ) {
639 } elseif ( in_array( $stat, [ 'NOT_EXIST', 'NOT_EXIST_LATEST' ] ) ) {
640 if ( !$latest ||
$stat === 'NOT_EXIST_LATEST' ) {
645 $stat = $this->doGetFileStat( $params );
646 if ( is_array( $stat ) ) { // file exists
647 // Strongly consistent backends can automatically set "latest"
648 $stat['latest'] = isset( $stat['latest'] ) ?
$stat['latest'] : $latest;
649 $this->cheapCache
->set( $path, 'stat', $stat );
650 $this->setFileCache( $path, $stat ); // update persistent cache
651 if ( isset( $stat['sha1'] ) ) { // some backends store SHA-1 as metadata
652 $this->cheapCache
->set( $path, 'sha1',
653 [ 'hash' => $stat['sha1'], 'latest' => $latest ] );
655 if ( isset( $stat['xattr'] ) ) { // some backends store headers/metadata
656 $stat['xattr'] = self
::normalizeXAttributes( $stat['xattr'] );
657 $this->cheapCache
->set( $path, 'xattr',
658 [ 'map' => $stat['xattr'], 'latest' => $latest ] );
660 } elseif ( $stat === false ) { // file does not exist
661 $this->cheapCache
->set( $path, 'stat', $latest ?
'NOT_EXIST_LATEST' : 'NOT_EXIST' );
662 $this->cheapCache
->set( $path, 'xattr', [ 'map' => false, 'latest' => $latest ] );
663 $this->cheapCache
->set( $path, 'sha1', [ 'hash' => false, 'latest' => $latest ] );
664 $this->logger
->debug( __METHOD__
. ": File $path does not exist.\n" );
665 } else { // an error occurred
666 $this->logger
->warning( __METHOD__
. ": Could not stat file $path.\n" );
673 * @see FileBackendStore::getFileStat()
675 abstract protected function doGetFileStat( array $params );
677 public function getFileContentsMulti( array $params ) {
678 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
680 $params = $this->setConcurrencyFlags( $params );
681 $contents = $this->doGetFileContentsMulti( $params );
687 * @see FileBackendStore::getFileContentsMulti()
688 * @param array $params
691 protected function doGetFileContentsMulti( array $params ) {
693 foreach ( $this->doGetLocalReferenceMulti( $params ) as $path => $fsFile ) {
694 MediaWiki\
suppressWarnings();
695 $contents[$path] = $fsFile ?
file_get_contents( $fsFile->getPath() ) : false;
696 MediaWiki\restoreWarnings
();
702 final public function getFileXAttributes( array $params ) {
703 $path = self
::normalizeStoragePath( $params['src'] );
704 if ( $path === null ) {
705 return false; // invalid storage path
707 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
708 $latest = !empty( $params['latest'] ); // use latest data?
709 if ( $this->cheapCache
->has( $path, 'xattr', self
::CACHE_TTL
) ) {
710 $stat = $this->cheapCache
->get( $path, 'xattr' );
711 // If we want the latest data, check that this cached
712 // value was in fact fetched with the latest available data.
713 if ( !$latest ||
$stat['latest'] ) {
717 $fields = $this->doGetFileXAttributes( $params );
718 $fields = is_array( $fields ) ? self
::normalizeXAttributes( $fields ) : false;
719 $this->cheapCache
->set( $path, 'xattr', [ 'map' => $fields, 'latest' => $latest ] );
725 * @see FileBackendStore::getFileXAttributes()
726 * @return bool|string
728 protected function doGetFileXAttributes( array $params ) {
729 return [ 'headers' => [], 'metadata' => [] ]; // not supported
732 final public function getFileSha1Base36( array $params ) {
733 $path = self
::normalizeStoragePath( $params['src'] );
734 if ( $path === null ) {
735 return false; // invalid storage path
737 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
738 $latest = !empty( $params['latest'] ); // use latest data?
739 if ( $this->cheapCache
->has( $path, 'sha1', self
::CACHE_TTL
) ) {
740 $stat = $this->cheapCache
->get( $path, 'sha1' );
741 // If we want the latest data, check that this cached
742 // value was in fact fetched with the latest available data.
743 if ( !$latest ||
$stat['latest'] ) {
744 return $stat['hash'];
747 $hash = $this->doGetFileSha1Base36( $params );
748 $this->cheapCache
->set( $path, 'sha1', [ 'hash' => $hash, 'latest' => $latest ] );
754 * @see FileBackendStore::getFileSha1Base36()
755 * @param array $params
756 * @return bool|string
758 protected function doGetFileSha1Base36( array $params ) {
759 $fsFile = $this->getLocalReference( $params );
763 return $fsFile->getSha1Base36();
767 final public function getFileProps( array $params ) {
768 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
769 $fsFile = $this->getLocalReference( $params );
770 $props = $fsFile ?
$fsFile->getProps() : FSFile
::placeholderProps();
775 final public function getLocalReferenceMulti( array $params ) {
776 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
778 $params = $this->setConcurrencyFlags( $params );
780 $fsFiles = []; // (path => FSFile)
781 $latest = !empty( $params['latest'] ); // use latest data?
782 // Reuse any files already in process cache...
783 foreach ( $params['srcs'] as $src ) {
784 $path = self
::normalizeStoragePath( $src );
785 if ( $path === null ) {
786 $fsFiles[$src] = null; // invalid storage path
787 } elseif ( $this->expensiveCache
->has( $path, 'localRef' ) ) {
788 $val = $this->expensiveCache
->get( $path, 'localRef' );
789 // If we want the latest data, check that this cached
790 // value was in fact fetched with the latest available data.
791 if ( !$latest ||
$val['latest'] ) {
792 $fsFiles[$src] = $val['object'];
796 // Fetch local references of any remaning files...
797 $params['srcs'] = array_diff( $params['srcs'], array_keys( $fsFiles ) );
798 foreach ( $this->doGetLocalReferenceMulti( $params ) as $path => $fsFile ) {
799 $fsFiles[$path] = $fsFile;
800 if ( $fsFile ) { // update the process cache...
801 $this->expensiveCache
->set( $path, 'localRef',
802 [ 'object' => $fsFile, 'latest' => $latest ] );
810 * @see FileBackendStore::getLocalReferenceMulti()
811 * @param array $params
814 protected function doGetLocalReferenceMulti( array $params ) {
815 return $this->doGetLocalCopyMulti( $params );
818 final public function getLocalCopyMulti( array $params ) {
819 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
821 $params = $this->setConcurrencyFlags( $params );
822 $tmpFiles = $this->doGetLocalCopyMulti( $params );
828 * @see FileBackendStore::getLocalCopyMulti()
829 * @param array $params
832 abstract protected function doGetLocalCopyMulti( array $params );
835 * @see FileBackend::getFileHttpUrl()
836 * @param array $params
837 * @return string|null
839 public function getFileHttpUrl( array $params ) {
840 return null; // not supported
843 final public function streamFile( array $params ) {
844 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
845 $status = $this->newStatus();
847 // Always set some fields for subclass convenience
848 $params['options'] = isset( $params['options'] ) ?
$params['options'] : [];
849 $params['headers'] = isset( $params['headers'] ) ?
$params['headers'] : [];
851 // Don't stream it out as text/html if there was a PHP error
852 if ( ( empty( $params['headless'] ) ||
$params['headers'] ) && headers_sent() ) {
853 print "Headers already sent, terminating.\n";
854 $status->fatal( 'backend-fail-stream', $params['src'] );
858 $status->merge( $this->doStreamFile( $params ) );
864 * @see FileBackendStore::streamFile()
865 * @param array $params
866 * @return StatusValue
868 protected function doStreamFile( array $params ) {
869 $status = $this->newStatus();
872 $flags |
= !empty( $params['headless'] ) ? HTTPFileStreamer
::STREAM_HEADLESS
: 0;
873 $flags |
= !empty( $params['allowOB'] ) ? HTTPFileStreamer
::STREAM_ALLOW_OB
: 0;
875 $fsFile = $this->getLocalReference( $params );
877 $streamer = new HTTPFileStreamer(
880 'obResetFunc' => $this->obResetFunc
,
881 'streamMimeFunc' => $this->streamMimeFunc
884 $res = $streamer->stream( $params['headers'], true, $params['options'], $flags );
887 HTTPFileStreamer
::send404Message( $params['src'], $flags );
891 $status->fatal( 'backend-fail-stream', $params['src'] );
897 final public function directoryExists( array $params ) {
898 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
899 if ( $dir === null ) {
900 return false; // invalid storage path
902 if ( $shard !== null ) { // confined to a single container/shard
903 return $this->doDirectoryExists( $fullCont, $dir, $params );
904 } else { // directory is on several shards
905 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
906 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
907 $res = false; // response
908 foreach ( $this->getContainerSuffixes( $shortCont ) as $suffix ) {
909 $exists = $this->doDirectoryExists( "{$fullCont}{$suffix}", $dir, $params );
913 } elseif ( $exists === null ) { // error?
914 $res = null; // if we don't find anything, it is indeterminate
923 * @see FileBackendStore::directoryExists()
925 * @param string $container Resolved container name
926 * @param string $dir Resolved path relative to container
927 * @param array $params
930 abstract protected function doDirectoryExists( $container, $dir, array $params );
932 final public function getDirectoryList( array $params ) {
933 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
934 if ( $dir === null ) { // invalid storage path
937 if ( $shard !== null ) {
938 // File listing is confined to a single container/shard
939 return $this->getDirectoryListInternal( $fullCont, $dir, $params );
941 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
942 // File listing spans multiple containers/shards
943 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
945 return new FileBackendStoreShardDirIterator( $this,
946 $fullCont, $dir, $this->getContainerSuffixes( $shortCont ), $params );
951 * Do not call this function from places outside FileBackend
953 * @see FileBackendStore::getDirectoryList()
955 * @param string $container Resolved container name
956 * @param string $dir Resolved path relative to container
957 * @param array $params
958 * @return Traversable|array|null Returns null on failure
960 abstract public function getDirectoryListInternal( $container, $dir, array $params );
962 final public function getFileList( array $params ) {
963 list( $fullCont, $dir, $shard ) = $this->resolveStoragePath( $params['dir'] );
964 if ( $dir === null ) { // invalid storage path
967 if ( $shard !== null ) {
968 // File listing is confined to a single container/shard
969 return $this->getFileListInternal( $fullCont, $dir, $params );
971 $this->logger
->debug( __METHOD__
. ": iterating over all container shards.\n" );
972 // File listing spans multiple containers/shards
973 list( , $shortCont, ) = self
::splitStoragePath( $params['dir'] );
975 return new FileBackendStoreShardFileIterator( $this,
976 $fullCont, $dir, $this->getContainerSuffixes( $shortCont ), $params );
981 * Do not call this function from places outside FileBackend
983 * @see FileBackendStore::getFileList()
985 * @param string $container Resolved container name
986 * @param string $dir Resolved path relative to container
987 * @param array $params
988 * @return Traversable|array|null Returns null on failure
990 abstract public function getFileListInternal( $container, $dir, array $params );
993 * Return a list of FileOp objects from a list of operations.
994 * Do not call this function from places outside FileBackend.
996 * The result must have the same number of items as the input.
997 * An exception is thrown if an unsupported operation is requested.
999 * @param array $ops Same format as doOperations()
1000 * @return FileOp[] List of FileOp objects
1001 * @throws FileBackendError
1003 final public function getOperationsInternal( array $ops ) {
1005 'store' => 'StoreFileOp',
1006 'copy' => 'CopyFileOp',
1007 'move' => 'MoveFileOp',
1008 'delete' => 'DeleteFileOp',
1009 'create' => 'CreateFileOp',
1010 'describe' => 'DescribeFileOp',
1011 'null' => 'NullFileOp'
1014 $performOps = []; // array of FileOp objects
1015 // Build up ordered array of FileOps...
1016 foreach ( $ops as $operation ) {
1017 $opName = $operation['op'];
1018 if ( isset( $supportedOps[$opName] ) ) {
1019 $class = $supportedOps[$opName];
1020 // Get params for this operation
1021 $params = $operation;
1022 // Append the FileOp class
1023 $performOps[] = new $class( $this, $params, $this->logger
);
1025 throw new FileBackendError( "Operation '$opName' is not supported." );
1033 * Get a list of storage paths to lock for a list of operations
1034 * Returns an array with LockManager::LOCK_UW (shared locks) and
1035 * LockManager::LOCK_EX (exclusive locks) keys, each corresponding
1036 * to a list of storage paths to be locked. All returned paths are
1039 * @param array $performOps List of FileOp objects
1040 * @return array (LockManager::LOCK_UW => path list, LockManager::LOCK_EX => path list)
1042 final public function getPathsToLockForOpsInternal( array $performOps ) {
1043 // Build up a list of files to lock...
1044 $paths = [ 'sh' => [], 'ex' => [] ];
1045 foreach ( $performOps as $fileOp ) {
1046 $paths['sh'] = array_merge( $paths['sh'], $fileOp->storagePathsRead() );
1047 $paths['ex'] = array_merge( $paths['ex'], $fileOp->storagePathsChanged() );
1049 // Optimization: if doing an EX lock anyway, don't also set an SH one
1050 $paths['sh'] = array_diff( $paths['sh'], $paths['ex'] );
1051 // Get a shared lock on the parent directory of each path changed
1052 $paths['sh'] = array_merge( $paths['sh'], array_map( 'dirname', $paths['ex'] ) );
1055 LockManager
::LOCK_UW
=> $paths['sh'],
1056 LockManager
::LOCK_EX
=> $paths['ex']
1060 public function getScopedLocksForOps( array $ops, StatusValue
$status ) {
1061 $paths = $this->getPathsToLockForOpsInternal( $this->getOperationsInternal( $ops ) );
1063 return $this->getScopedFileLocks( $paths, 'mixed', $status );
1066 final protected function doOperationsInternal( array $ops, array $opts ) {
1067 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1068 $status = $this->newStatus();
1070 // Fix up custom header name/value pairs...
1071 $ops = array_map( [ $this, 'sanitizeOpHeaders' ], $ops );
1073 // Build up a list of FileOps...
1074 $performOps = $this->getOperationsInternal( $ops );
1076 // Acquire any locks as needed...
1077 if ( empty( $opts['nonLocking'] ) ) {
1078 // Build up a list of files to lock...
1079 $paths = $this->getPathsToLockForOpsInternal( $performOps );
1080 // Try to lock those files for the scope of this function...
1082 $scopeLock = $this->getScopedFileLocks( $paths, 'mixed', $status );
1083 if ( !$status->isOK() ) {
1084 return $status; // abort
1088 // Clear any file cache entries (after locks acquired)
1089 if ( empty( $opts['preserveCache'] ) ) {
1090 $this->clearCache();
1093 // Build the list of paths involved
1095 foreach ( $performOps as $op ) {
1096 $paths = array_merge( $paths, $op->storagePathsRead() );
1097 $paths = array_merge( $paths, $op->storagePathsChanged() );
1100 // Enlarge the cache to fit the stat entries of these files
1101 $this->cheapCache
->resize( max( 2 * count( $paths ), self
::CACHE_CHEAP_SIZE
) );
1103 // Load from the persistent container caches
1104 $this->primeContainerCache( $paths );
1105 // Get the latest stat info for all the files (having locked them)
1106 $ok = $this->preloadFileStat( [ 'srcs' => $paths, 'latest' => true ] );
1109 // Actually attempt the operation batch...
1110 $opts = $this->setConcurrencyFlags( $opts );
1111 $subStatus = FileOpBatch
::attempt( $performOps, $opts, $this->fileJournal
);
1113 // If we could not even stat some files, then bail out...
1114 $subStatus = $this->newStatus( 'backend-fail-internal', $this->name
);
1115 foreach ( $ops as $i => $op ) { // mark each op as failed
1116 $subStatus->success
[$i] = false;
1117 ++
$subStatus->failCount
;
1119 $this->logger
->error( get_class( $this ) . "-{$this->name} " .
1120 " stat failure; aborted operations: " . FormatJson
::encode( $ops ) );
1123 // Merge errors into StatusValue fields
1124 $status->merge( $subStatus );
1125 $status->success
= $subStatus->success
; // not done in merge()
1127 // Shrink the stat cache back to normal size
1128 $this->cheapCache
->resize( self
::CACHE_CHEAP_SIZE
);
1133 final protected function doQuickOperationsInternal( array $ops ) {
1134 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1135 $status = $this->newStatus();
1137 // Fix up custom header name/value pairs...
1138 $ops = array_map( [ $this, 'sanitizeOpHeaders' ], $ops );
1140 // Clear any file cache entries
1141 $this->clearCache();
1143 $supportedOps = [ 'create', 'store', 'copy', 'move', 'delete', 'describe', 'null' ];
1144 // Parallel ops may be disabled in config due to dependencies (e.g. needing popen())
1145 $async = ( $this->parallelize
=== 'implicit' && count( $ops ) > 1 );
1146 $maxConcurrency = $this->concurrency
; // throttle
1147 /** @var StatusValue[] $statuses */
1148 $statuses = []; // array of (index => StatusValue)
1149 $fileOpHandles = []; // list of (index => handle) arrays
1150 $curFileOpHandles = []; // current handle batch
1151 // Perform the sync-only ops and build up op handles for the async ops...
1152 foreach ( $ops as $index => $params ) {
1153 if ( !in_array( $params['op'], $supportedOps ) ) {
1154 throw new FileBackendError( "Operation '{$params['op']}' is not supported." );
1156 $method = $params['op'] . 'Internal'; // e.g. "storeInternal"
1157 $subStatus = $this->$method( [ 'async' => $async ] +
$params );
1158 if ( $subStatus->value
instanceof FileBackendStoreOpHandle
) { // async
1159 if ( count( $curFileOpHandles ) >= $maxConcurrency ) {
1160 $fileOpHandles[] = $curFileOpHandles; // push this batch
1161 $curFileOpHandles = [];
1163 $curFileOpHandles[$index] = $subStatus->value
; // keep index
1164 } else { // error or completed
1165 $statuses[$index] = $subStatus; // keep index
1168 if ( count( $curFileOpHandles ) ) {
1169 $fileOpHandles[] = $curFileOpHandles; // last batch
1171 // Do all the async ops that can be done concurrently...
1172 foreach ( $fileOpHandles as $fileHandleBatch ) {
1173 $statuses = $statuses +
$this->executeOpHandlesInternal( $fileHandleBatch );
1175 // Marshall and merge all the responses...
1176 foreach ( $statuses as $index => $subStatus ) {
1177 $status->merge( $subStatus );
1178 if ( $subStatus->isOK() ) {
1179 $status->success
[$index] = true;
1180 ++
$status->successCount
;
1182 $status->success
[$index] = false;
1183 ++
$status->failCount
;
1191 * Execute a list of FileBackendStoreOpHandle handles in parallel.
1192 * The resulting StatusValue object fields will correspond
1193 * to the order in which the handles where given.
1195 * @param FileBackendStoreOpHandle[] $fileOpHandles
1197 * @throws FileBackendError
1198 * @return StatusValue[] Map of StatusValue objects
1200 final public function executeOpHandlesInternal( array $fileOpHandles ) {
1201 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1203 foreach ( $fileOpHandles as $fileOpHandle ) {
1204 if ( !( $fileOpHandle instanceof FileBackendStoreOpHandle
) ) {
1205 throw new InvalidArgumentException( "Got a non-FileBackendStoreOpHandle object." );
1206 } elseif ( $fileOpHandle->backend
->getName() !== $this->getName() ) {
1207 throw new InvalidArgumentException(
1208 "Got a FileBackendStoreOpHandle for the wrong backend." );
1211 $res = $this->doExecuteOpHandlesInternal( $fileOpHandles );
1212 foreach ( $fileOpHandles as $fileOpHandle ) {
1213 $fileOpHandle->closeResources();
1220 * @see FileBackendStore::executeOpHandlesInternal()
1222 * @param FileBackendStoreOpHandle[] $fileOpHandles
1224 * @throws FileBackendError
1225 * @return StatusValue[] List of corresponding StatusValue objects
1227 protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
1228 if ( count( $fileOpHandles ) ) {
1229 throw new LogicException( "Backend does not support asynchronous operations." );
1236 * Normalize and filter HTTP headers from a file operation
1238 * This normalizes and strips long HTTP headers from a file operation.
1239 * Most headers are just numbers, but some are allowed to be long.
1240 * This function is useful for cleaning up headers and avoiding backend
1241 * specific errors, especially in the middle of batch file operations.
1243 * @param array $op Same format as doOperation()
1246 protected function sanitizeOpHeaders( array $op ) {
1247 static $longs = [ 'content-disposition' ];
1249 if ( isset( $op['headers'] ) ) { // op sets HTTP headers
1251 foreach ( $op['headers'] as $name => $value ) {
1252 $name = strtolower( $name );
1253 $maxHVLen = in_array( $name, $longs ) ? INF
: 255;
1254 if ( strlen( $name ) > 255 ||
strlen( $value ) > $maxHVLen ) {
1255 trigger_error( "Header '$name: $value' is too long." );
1257 $newHeaders[$name] = strlen( $value ) ?
$value : ''; // null/false => ""
1260 $op['headers'] = $newHeaders;
1266 final public function preloadCache( array $paths ) {
1267 $fullConts = []; // full container names
1268 foreach ( $paths as $path ) {
1269 list( $fullCont, , ) = $this->resolveStoragePath( $path );
1270 $fullConts[] = $fullCont;
1272 // Load from the persistent file and container caches
1273 $this->primeContainerCache( $fullConts );
1274 $this->primeFileCache( $paths );
1277 final public function clearCache( array $paths = null ) {
1278 if ( is_array( $paths ) ) {
1279 $paths = array_map( 'FileBackend::normalizeStoragePath', $paths );
1280 $paths = array_filter( $paths, 'strlen' ); // remove nulls
1282 if ( $paths === null ) {
1283 $this->cheapCache
->clear();
1284 $this->expensiveCache
->clear();
1286 foreach ( $paths as $path ) {
1287 $this->cheapCache
->clear( $path );
1288 $this->expensiveCache
->clear( $path );
1291 $this->doClearCache( $paths );
1295 * Clears any additional stat caches for storage paths
1297 * @see FileBackend::clearCache()
1299 * @param array $paths Storage paths (optional)
1301 protected function doClearCache( array $paths = null ) {
1304 final public function preloadFileStat( array $params ) {
1305 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1306 $success = true; // no network errors
1308 $params['concurrency'] = ( $this->parallelize
!== 'off' ) ?
$this->concurrency
: 1;
1309 $stats = $this->doGetFileStatMulti( $params );
1310 if ( $stats === null ) {
1311 return true; // not supported
1314 $latest = !empty( $params['latest'] ); // use latest data?
1315 foreach ( $stats as $path => $stat ) {
1316 $path = FileBackend
::normalizeStoragePath( $path );
1317 if ( $path === null ) {
1318 continue; // this shouldn't happen
1320 if ( is_array( $stat ) ) { // file exists
1321 // Strongly consistent backends can automatically set "latest"
1322 $stat['latest'] = isset( $stat['latest'] ) ?
$stat['latest'] : $latest;
1323 $this->cheapCache
->set( $path, 'stat', $stat );
1324 $this->setFileCache( $path, $stat ); // update persistent cache
1325 if ( isset( $stat['sha1'] ) ) { // some backends store SHA-1 as metadata
1326 $this->cheapCache
->set( $path, 'sha1',
1327 [ 'hash' => $stat['sha1'], 'latest' => $latest ] );
1329 if ( isset( $stat['xattr'] ) ) { // some backends store headers/metadata
1330 $stat['xattr'] = self
::normalizeXAttributes( $stat['xattr'] );
1331 $this->cheapCache
->set( $path, 'xattr',
1332 [ 'map' => $stat['xattr'], 'latest' => $latest ] );
1334 } elseif ( $stat === false ) { // file does not exist
1335 $this->cheapCache
->set( $path, 'stat',
1336 $latest ?
'NOT_EXIST_LATEST' : 'NOT_EXIST' );
1337 $this->cheapCache
->set( $path, 'xattr',
1338 [ 'map' => false, 'latest' => $latest ] );
1339 $this->cheapCache
->set( $path, 'sha1',
1340 [ 'hash' => false, 'latest' => $latest ] );
1341 $this->logger
->debug( __METHOD__
. ": File $path does not exist.\n" );
1342 } else { // an error occurred
1344 $this->logger
->warning( __METHOD__
. ": Could not stat file $path.\n" );
1352 * Get file stat information (concurrently if possible) for several files
1354 * @see FileBackend::getFileStat()
1356 * @param array $params Parameters include:
1357 * - srcs : list of source storage paths
1358 * - latest : use the latest available data
1359 * @return array|null Map of storage paths to array|bool|null (returns null if not supported)
1362 protected function doGetFileStatMulti( array $params ) {
1363 return null; // not supported
1367 * Is this a key/value store where directories are just virtual?
1368 * Virtual directories exists in so much as files exists that are
1369 * prefixed with the directory path followed by a forward slash.
1373 abstract protected function directoriesAreVirtual();
1376 * Check if a short container name is valid
1378 * This checks for length and illegal characters.
1379 * This may disallow certain characters that can appear
1380 * in the prefix used to make the full container name.
1382 * @param string $container
1385 final protected static function isValidShortContainerName( $container ) {
1386 // Suffixes like '.xxx' (hex shard chars) or '.seg' (file segments)
1387 // might be used by subclasses. Reserve the dot character for sanity.
1388 // The only way dots end up in containers (e.g. resolveStoragePath)
1389 // is due to the wikiId container prefix or the above suffixes.
1390 return self
::isValidContainerName( $container ) && !preg_match( '/[.]/', $container );
1394 * Check if a full container name is valid
1396 * This checks for length and illegal characters.
1397 * Limiting the characters makes migrations to other stores easier.
1399 * @param string $container
1402 final protected static function isValidContainerName( $container ) {
1403 // This accounts for NTFS, Swift, and Ceph restrictions
1404 // and disallows directory separators or traversal characters.
1405 // Note that matching strings URL encode to the same string;
1406 // in Swift/Ceph, the length restriction is *after* URL encoding.
1407 return (bool)preg_match( '/^[a-z0-9][a-z0-9-_.]{0,199}$/i', $container );
1411 * Splits a storage path into an internal container name,
1412 * an internal relative file name, and a container shard suffix.
1413 * Any shard suffix is already appended to the internal container name.
1414 * This also checks that the storage path is valid and within this backend.
1416 * If the container is sharded but a suffix could not be determined,
1417 * this means that the path can only refer to a directory and can only
1418 * be scanned by looking in all the container shards.
1420 * @param string $storagePath
1421 * @return array (container, path, container suffix) or (null, null, null) if invalid
1423 final protected function resolveStoragePath( $storagePath ) {
1424 list( $backend, $shortCont, $relPath ) = self
::splitStoragePath( $storagePath );
1425 if ( $backend === $this->name
) { // must be for this backend
1426 $relPath = self
::normalizeContainerPath( $relPath );
1427 if ( $relPath !== null && self
::isValidShortContainerName( $shortCont ) ) {
1428 // Get shard for the normalized path if this container is sharded
1429 $cShard = $this->getContainerShard( $shortCont, $relPath );
1430 // Validate and sanitize the relative path (backend-specific)
1431 $relPath = $this->resolveContainerPath( $shortCont, $relPath );
1432 if ( $relPath !== null ) {
1433 // Prepend any wiki ID prefix to the container name
1434 $container = $this->fullContainerName( $shortCont );
1435 if ( self
::isValidContainerName( $container ) ) {
1436 // Validate and sanitize the container name (backend-specific)
1437 $container = $this->resolveContainerName( "{$container}{$cShard}" );
1438 if ( $container !== null ) {
1439 return [ $container, $relPath, $cShard ];
1446 return [ null, null, null ];
1450 * Like resolveStoragePath() except null values are returned if
1451 * the container is sharded and the shard could not be determined
1452 * or if the path ends with '/'. The latter case is illegal for FS
1453 * backends and can confuse listings for object store backends.
1455 * This function is used when resolving paths that must be valid
1456 * locations for files. Directory and listing functions should
1457 * generally just use resolveStoragePath() instead.
1459 * @see FileBackendStore::resolveStoragePath()
1461 * @param string $storagePath
1462 * @return array (container, path) or (null, null) if invalid
1464 final protected function resolveStoragePathReal( $storagePath ) {
1465 list( $container, $relPath, $cShard ) = $this->resolveStoragePath( $storagePath );
1466 if ( $cShard !== null && substr( $relPath, -1 ) !== '/' ) {
1467 return [ $container, $relPath ];
1470 return [ null, null ];
1474 * Get the container name shard suffix for a given path.
1475 * Any empty suffix means the container is not sharded.
1477 * @param string $container Container name
1478 * @param string $relPath Storage path relative to the container
1479 * @return string|null Returns null if shard could not be determined
1481 final protected function getContainerShard( $container, $relPath ) {
1482 list( $levels, $base, $repeat ) = $this->getContainerHashLevels( $container );
1483 if ( $levels == 1 ||
$levels == 2 ) {
1484 // Hash characters are either base 16 or 36
1485 $char = ( $base == 36 ) ?
'[0-9a-z]' : '[0-9a-f]';
1486 // Get a regex that represents the shard portion of paths.
1487 // The concatenation of the captures gives us the shard.
1488 if ( $levels === 1 ) { // 16 or 36 shards per container
1489 $hashDirRegex = '(' . $char . ')';
1490 } else { // 256 or 1296 shards per container
1491 if ( $repeat ) { // verbose hash dir format (e.g. "a/ab/abc")
1492 $hashDirRegex = $char . '/(' . $char . '{2})';
1493 } else { // short hash dir format (e.g. "a/b/c")
1494 $hashDirRegex = '(' . $char . ')/(' . $char . ')';
1497 // Allow certain directories to be above the hash dirs so as
1498 // to work with FileRepo (e.g. "archive/a/ab" or "temp/a/ab").
1499 // They must be 2+ chars to avoid any hash directory ambiguity.
1501 if ( preg_match( "!^(?:[^/]{2,}/)*$hashDirRegex(?:/|$)!", $relPath, $m ) ) {
1502 return '.' . implode( '', array_slice( $m, 1 ) );
1505 return null; // failed to match
1508 return ''; // no sharding
1512 * Check if a storage path maps to a single shard.
1513 * Container dirs like "a", where the container shards on "x/xy",
1514 * can reside on several shards. Such paths are tricky to handle.
1516 * @param string $storagePath Storage path
1519 final public function isSingleShardPathInternal( $storagePath ) {
1520 list( , , $shard ) = $this->resolveStoragePath( $storagePath );
1522 return ( $shard !== null );
1526 * Get the sharding config for a container.
1527 * If greater than 0, then all file storage paths within
1528 * the container are required to be hashed accordingly.
1530 * @param string $container
1531 * @return array (integer levels, integer base, repeat flag) or (0, 0, false)
1533 final protected function getContainerHashLevels( $container ) {
1534 if ( isset( $this->shardViaHashLevels
[$container] ) ) {
1535 $config = $this->shardViaHashLevels
[$container];
1536 $hashLevels = (int)$config['levels'];
1537 if ( $hashLevels == 1 ||
$hashLevels == 2 ) {
1538 $hashBase = (int)$config['base'];
1539 if ( $hashBase == 16 ||
$hashBase == 36 ) {
1540 return [ $hashLevels, $hashBase, $config['repeat'] ];
1545 return [ 0, 0, false ]; // no sharding
1549 * Get a list of full container shard suffixes for a container
1551 * @param string $container
1554 final protected function getContainerSuffixes( $container ) {
1556 list( $digits, $base ) = $this->getContainerHashLevels( $container );
1557 if ( $digits > 0 ) {
1558 $numShards = pow( $base, $digits );
1559 for ( $index = 0; $index < $numShards; $index++
) {
1560 $shards[] = '.' . Wikimedia\base_convert
( $index, 10, $base, $digits );
1568 * Get the full container name, including the wiki ID prefix
1570 * @param string $container
1573 final protected function fullContainerName( $container ) {
1574 if ( $this->domainId
!= '' ) {
1575 return "{$this->domainId}-$container";
1582 * Resolve a container name, checking if it's allowed by the backend.
1583 * This is intended for internal use, such as encoding illegal chars.
1584 * Subclasses can override this to be more restrictive.
1586 * @param string $container
1587 * @return string|null
1589 protected function resolveContainerName( $container ) {
1594 * Resolve a relative storage path, checking if it's allowed by the backend.
1595 * This is intended for internal use, such as encoding illegal chars or perhaps
1596 * getting absolute paths (e.g. FS based backends). Note that the relative path
1597 * may be the empty string (e.g. the path is simply to the container).
1599 * @param string $container Container name
1600 * @param string $relStoragePath Storage path relative to the container
1601 * @return string|null Path or null if not valid
1603 protected function resolveContainerPath( $container, $relStoragePath ) {
1604 return $relStoragePath;
1608 * Get the cache key for a container
1610 * @param string $container Resolved container name
1613 private function containerCacheKey( $container ) {
1614 return "filebackend:{$this->name}:{$this->domainId}:container:{$container}";
1618 * Set the cached info for a container
1620 * @param string $container Resolved container name
1621 * @param array $val Information to cache
1623 final protected function setContainerCache( $container, array $val ) {
1624 $this->memCache
->set( $this->containerCacheKey( $container ), $val, 14 * 86400 );
1628 * Delete the cached info for a container.
1629 * The cache key is salted for a while to prevent race conditions.
1631 * @param string $container Resolved container name
1633 final protected function deleteContainerCache( $container ) {
1634 if ( !$this->memCache
->delete( $this->containerCacheKey( $container ), 300 ) ) {
1635 trigger_error( "Unable to delete stat cache for container $container." );
1640 * Do a batch lookup from cache for container stats for all containers
1641 * used in a list of container names or storage paths objects.
1642 * This loads the persistent cache values into the process cache.
1644 * @param array $items
1646 final protected function primeContainerCache( array $items ) {
1647 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1649 $paths = []; // list of storage paths
1650 $contNames = []; // (cache key => resolved container name)
1651 // Get all the paths/containers from the items...
1652 foreach ( $items as $item ) {
1653 if ( self
::isStoragePath( $item ) ) {
1655 } elseif ( is_string( $item ) ) { // full container name
1656 $contNames[$this->containerCacheKey( $item )] = $item;
1659 // Get all the corresponding cache keys for paths...
1660 foreach ( $paths as $path ) {
1661 list( $fullCont, , ) = $this->resolveStoragePath( $path );
1662 if ( $fullCont !== null ) { // valid path for this backend
1663 $contNames[$this->containerCacheKey( $fullCont )] = $fullCont;
1667 $contInfo = []; // (resolved container name => cache value)
1668 // Get all cache entries for these container cache keys...
1669 $values = $this->memCache
->getMulti( array_keys( $contNames ) );
1670 foreach ( $values as $cacheKey => $val ) {
1671 $contInfo[$contNames[$cacheKey]] = $val;
1674 // Populate the container process cache for the backend...
1675 $this->doPrimeContainerCache( array_filter( $contInfo, 'is_array' ) );
1679 * Fill the backend-specific process cache given an array of
1680 * resolved container names and their corresponding cached info.
1681 * Only containers that actually exist should appear in the map.
1683 * @param array $containerInfo Map of resolved container names to cached info
1685 protected function doPrimeContainerCache( array $containerInfo ) {
1689 * Get the cache key for a file path
1691 * @param string $path Normalized storage path
1694 private function fileCacheKey( $path ) {
1695 return "filebackend:{$this->name}:{$this->domainId}:file:" . sha1( $path );
1699 * Set the cached stat info for a file path.
1700 * Negatives (404s) are not cached. By not caching negatives, we can skip cache
1701 * salting for the case when a file is created at a path were there was none before.
1703 * @param string $path Storage path
1704 * @param array $val Stat information to cache
1706 final protected function setFileCache( $path, array $val ) {
1707 $path = FileBackend
::normalizeStoragePath( $path );
1708 if ( $path === null ) {
1709 return; // invalid storage path
1711 $mtime = ConvertibleTimestamp
::convert( TS_UNIX
, $val['mtime'] );
1712 $ttl = $this->memCache
->adaptiveTTL( $mtime, 7 * 86400, 300, .1 );
1713 $key = $this->fileCacheKey( $path );
1714 // Set the cache unless it is currently salted.
1715 $this->memCache
->set( $key, $val, $ttl );
1719 * Delete the cached stat info for a file path.
1720 * The cache key is salted for a while to prevent race conditions.
1721 * Since negatives (404s) are not cached, this does not need to be called when
1722 * a file is created at a path were there was none before.
1724 * @param string $path Storage path
1726 final protected function deleteFileCache( $path ) {
1727 $path = FileBackend
::normalizeStoragePath( $path );
1728 if ( $path === null ) {
1729 return; // invalid storage path
1731 if ( !$this->memCache
->delete( $this->fileCacheKey( $path ), 300 ) ) {
1732 trigger_error( "Unable to delete stat cache for file $path." );
1737 * Do a batch lookup from cache for file stats for all paths
1738 * used in a list of storage paths or FileOp objects.
1739 * This loads the persistent cache values into the process cache.
1741 * @param array $items List of storage paths
1743 final protected function primeFileCache( array $items ) {
1744 $ps = $this->scopedProfileSection( __METHOD__
. "-{$this->name}" );
1746 $paths = []; // list of storage paths
1747 $pathNames = []; // (cache key => storage path)
1748 // Get all the paths/containers from the items...
1749 foreach ( $items as $item ) {
1750 if ( self
::isStoragePath( $item ) ) {
1751 $paths[] = FileBackend
::normalizeStoragePath( $item );
1754 // Get rid of any paths that failed normalization...
1755 $paths = array_filter( $paths, 'strlen' ); // remove nulls
1756 // Get all the corresponding cache keys for paths...
1757 foreach ( $paths as $path ) {
1758 list( , $rel, ) = $this->resolveStoragePath( $path );
1759 if ( $rel !== null ) { // valid path for this backend
1760 $pathNames[$this->fileCacheKey( $path )] = $path;
1763 // Get all cache entries for these file cache keys...
1764 $values = $this->memCache
->getMulti( array_keys( $pathNames ) );
1765 foreach ( $values as $cacheKey => $val ) {
1766 $path = $pathNames[$cacheKey];
1767 if ( is_array( $val ) ) {
1768 $val['latest'] = false; // never completely trust cache
1769 $this->cheapCache
->set( $path, 'stat', $val );
1770 if ( isset( $val['sha1'] ) ) { // some backends store SHA-1 as metadata
1771 $this->cheapCache
->set( $path, 'sha1',
1772 [ 'hash' => $val['sha1'], 'latest' => false ] );
1774 if ( isset( $val['xattr'] ) ) { // some backends store headers/metadata
1775 $val['xattr'] = self
::normalizeXAttributes( $val['xattr'] );
1776 $this->cheapCache
->set( $path, 'xattr',
1777 [ 'map' => $val['xattr'], 'latest' => false ] );
1784 * Normalize file headers/metadata to the FileBackend::getFileXAttributes() format
1786 * @param array $xattr
1790 final protected static function normalizeXAttributes( array $xattr ) {
1791 $newXAttr = [ 'headers' => [], 'metadata' => [] ];
1793 foreach ( $xattr['headers'] as $name => $value ) {
1794 $newXAttr['headers'][strtolower( $name )] = $value;
1797 foreach ( $xattr['metadata'] as $name => $value ) {
1798 $newXAttr['metadata'][strtolower( $name )] = $value;
1805 * Set the 'concurrency' option from a list of operation options
1807 * @param array $opts Map of operation options
1810 final protected function setConcurrencyFlags( array $opts ) {
1811 $opts['concurrency'] = 1; // off
1812 if ( $this->parallelize
=== 'implicit' ) {
1813 if ( !isset( $opts['parallelize'] ) ||
$opts['parallelize'] ) {
1814 $opts['concurrency'] = $this->concurrency
;
1816 } elseif ( $this->parallelize
=== 'explicit' ) {
1817 if ( !empty( $opts['parallelize'] ) ) {
1818 $opts['concurrency'] = $this->concurrency
;
1826 * Get the content type to use in HEAD/GET requests for a file
1828 * @param string $storagePath
1829 * @param string|null $content File data
1830 * @param string|null $fsPath File system path
1831 * @return string MIME type
1833 protected function getContentType( $storagePath, $content, $fsPath ) {
1834 if ( $this->mimeCallback
) {
1835 return call_user_func_array( $this->mimeCallback
, func_get_args() );
1839 if ( $fsPath !== null && function_exists( 'finfo_file' ) ) {
1840 $finfo = finfo_open( FILEINFO_MIME_TYPE
);
1841 $mime = finfo_file( $finfo, $fsPath );
1842 finfo_close( $finfo );
1845 return is_string( $mime ) ?
$mime : 'unknown/unknown';
1850 * FileBackendStore helper class for performing asynchronous file operations.
1852 * For example, calling FileBackendStore::createInternal() with the "async"
1853 * param flag may result in a StatusValue that contains this object as a value.
1854 * This class is largely backend-specific and is mostly just "magic" to be
1855 * passed to FileBackendStore::executeOpHandlesInternal().
1857 abstract class FileBackendStoreOpHandle
{
1859 public $params = []; // params to caller functions
1860 /** @var FileBackendStore */
1863 public $resourcesToClose = [];
1865 public $call; // string; name that identifies the function called
1868 * Close all open file handles
1870 public function closeResources() {
1871 array_map( 'fclose', $this->resourcesToClose
);
1876 * FileBackendStore helper function to handle listings that span container shards.
1877 * Do not use this class from places outside of FileBackendStore.
1879 * @ingroup FileBackend
1881 abstract class FileBackendStoreShardListIterator
extends FilterIterator
{
1882 /** @var FileBackendStore */
1888 /** @var string Full container name */
1889 protected $container;
1891 /** @var string Resolved relative path */
1892 protected $directory;
1895 protected $multiShardPaths = []; // (rel path => 1)
1898 * @param FileBackendStore $backend
1899 * @param string $container Full storage container name
1900 * @param string $dir Storage directory relative to container
1901 * @param array $suffixes List of container shard suffixes
1902 * @param array $params
1904 public function __construct(
1905 FileBackendStore
$backend, $container, $dir, array $suffixes, array $params
1907 $this->backend
= $backend;
1908 $this->container
= $container;
1909 $this->directory
= $dir;
1910 $this->params
= $params;
1912 $iter = new AppendIterator();
1913 foreach ( $suffixes as $suffix ) {
1914 $iter->append( $this->listFromShard( $this->container
. $suffix ) );
1917 parent
::__construct( $iter );
1920 public function accept() {
1921 $rel = $this->getInnerIterator()->current(); // path relative to given directory
1922 $path = $this->params
['dir'] . "/{$rel}"; // full storage path
1923 if ( $this->backend
->isSingleShardPathInternal( $path ) ) {
1924 return true; // path is only on one shard; no issue with duplicates
1925 } elseif ( isset( $this->multiShardPaths
[$rel] ) ) {
1926 // Don't keep listing paths that are on multiple shards
1929 $this->multiShardPaths
[$rel] = 1;
1935 public function rewind() {
1937 $this->multiShardPaths
= [];
1941 * Get the list for a given container shard
1943 * @param string $container Resolved container name
1946 abstract protected function listFromShard( $container );
1950 * Iterator for listing directories
1952 class FileBackendStoreShardDirIterator
extends FileBackendStoreShardListIterator
{
1953 protected function listFromShard( $container ) {
1954 $list = $this->backend
->getDirectoryListInternal(
1955 $container, $this->directory
, $this->params
);
1956 if ( $list === null ) {
1957 return new ArrayIterator( [] );
1959 return is_array( $list ) ?
new ArrayIterator( $list ) : $list;
1965 * Iterator for listing regular files
1967 class FileBackendStoreShardFileIterator
extends FileBackendStoreShardListIterator
{
1968 protected function listFromShard( $container ) {
1969 $list = $this->backend
->getFileListInternal(
1970 $container, $this->directory
, $this->params
);
1971 if ( $list === null ) {
1972 return new ArrayIterator( [] );
1974 return is_array( $list ) ?
new ArrayIterator( $list ) : $list;