725 lines
22 KiB
PHP
725 lines
22 KiB
PHP
<?php
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/**
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* Service for storing and loading data blobs representing revision content.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* Attribution notice: when this file was created, much of its content was taken
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* from the Revision.php file as present in release 1.30. Refer to the history
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* of that file for original authorship.
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*
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* @file
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*/
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namespace MediaWiki\Storage;
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use AppendIterator;
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use DBAccessObjectUtils;
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use ExternalStoreAccess;
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use IDBAccessObject;
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use IExpiringStore;
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use InvalidArgumentException;
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use MWException;
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use StatusValue;
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use WANObjectCache;
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use Wikimedia\Assert\Assert;
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use Wikimedia\AtEase\AtEase;
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use Wikimedia\Rdbms\IDatabase;
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use Wikimedia\Rdbms\ILoadBalancer;
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/**
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* Service for storing and loading Content objects.
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*
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* @since 1.31
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*
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* @note This was written to act as a drop-in replacement for the corresponding
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* static methods in Revision.
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*/
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class SqlBlobStore implements IDBAccessObject, BlobStore {
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// Note: the name has been taken unchanged from the Revision class.
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public const TEXT_CACHE_GROUP = 'revisiontext:10';
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/**
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* @var ILoadBalancer
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*/
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private $dbLoadBalancer;
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/**
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* @var ExternalStoreAccess
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*/
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private $extStoreAccess;
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/**
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* @var WANObjectCache
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*/
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private $cache;
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/**
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* @var string|bool DB domain ID of a wiki or false for the local one
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*/
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private $dbDomain;
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/**
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* @var int
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*/
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private $cacheExpiry = 604800; // 7 days
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/**
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* @var bool
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*/
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private $compressBlobs = false;
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/**
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* @var bool|string
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*/
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private $legacyEncoding = false;
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/**
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* @var boolean
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*/
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private $useExternalStore = false;
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/**
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* @param ILoadBalancer $dbLoadBalancer A load balancer for acquiring database connections
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* @param ExternalStoreAccess $extStoreAccess Access layer for external storage
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* @param WANObjectCache $cache A cache manager for caching blobs. This can be the local
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* wiki's default instance even if $dbDomain refers to a different wiki, since
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* makeGlobalKey() is used to construct a key that allows cached blobs from the
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* same database to be re-used between wikis. For example, wiki A and wiki B will
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* use the same cache keys for blobs fetched from wiki C, regardless of the
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* wiki-specific default key space.
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* @param bool|string $dbDomain The ID of the target wiki database. Use false for the local wiki.
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*/
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public function __construct(
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ILoadBalancer $dbLoadBalancer,
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ExternalStoreAccess $extStoreAccess,
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WANObjectCache $cache,
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$dbDomain = false
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) {
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$this->dbLoadBalancer = $dbLoadBalancer;
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$this->extStoreAccess = $extStoreAccess;
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$this->cache = $cache;
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$this->dbDomain = $dbDomain;
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}
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/**
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* @return int time for which blobs can be cached, in seconds
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*/
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public function getCacheExpiry() {
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return $this->cacheExpiry;
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}
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/**
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* @param int $cacheExpiry time for which blobs can be cached, in seconds
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*/
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public function setCacheExpiry( $cacheExpiry ) {
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Assert::parameterType( 'integer', $cacheExpiry, '$cacheExpiry' );
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$this->cacheExpiry = $cacheExpiry;
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}
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/**
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* @return bool whether blobs should be compressed for storage
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*/
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public function getCompressBlobs() {
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return $this->compressBlobs;
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}
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/**
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* @param bool $compressBlobs whether blobs should be compressed for storage
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*/
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public function setCompressBlobs( $compressBlobs ) {
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$this->compressBlobs = $compressBlobs;
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}
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/**
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* @return false|string The legacy encoding to assume for blobs that are not marked as utf8.
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* False means handling of legacy encoding is disabled, and utf8 assumed.
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*/
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public function getLegacyEncoding() {
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return $this->legacyEncoding;
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}
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/**
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* @deprecated since 1.34 No longer needed
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* @return null
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*/
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public function getLegacyEncodingConversionLang() {
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wfDeprecated( __METHOD__ );
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return null;
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}
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/**
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* Set the legacy encoding to assume for blobs that do not have the utf-8 flag set.
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*
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* @note The second parameter, Language $language, was removed in 1.34.
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*
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* @param string $legacyEncoding The legacy encoding to assume for blobs that are
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* not marked as utf8.
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*/
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public function setLegacyEncoding( $legacyEncoding ) {
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Assert::parameterType( 'string', $legacyEncoding, '$legacyEncoding' );
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$this->legacyEncoding = $legacyEncoding;
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}
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/**
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* @return bool Whether to use the ExternalStore mechanism for storing blobs.
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*/
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public function getUseExternalStore() {
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return $this->useExternalStore;
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}
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/**
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* @param bool $useExternalStore Whether to use the ExternalStore mechanism for storing blobs.
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*/
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public function setUseExternalStore( $useExternalStore ) {
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Assert::parameterType( 'boolean', $useExternalStore, '$useExternalStore' );
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$this->useExternalStore = $useExternalStore;
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}
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/**
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* @return ILoadBalancer
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*/
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private function getDBLoadBalancer() {
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return $this->dbLoadBalancer;
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}
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/**
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* @param int $index A database index, like DB_MASTER or DB_REPLICA
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*
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* @return IDatabase
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*/
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private function getDBConnection( $index ) {
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$lb = $this->getDBLoadBalancer();
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return $lb->getConnectionRef( $index, [], $this->dbDomain );
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}
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/**
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* Stores an arbitrary blob of data and returns an address that can be used with
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* getBlob() to retrieve the same blob of data,
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*
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* @param string $data
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* @param array $hints An array of hints.
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*
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* @throws BlobAccessException
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* @return string an address that can be used with getBlob() to retrieve the data.
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*/
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public function storeBlob( $data, $hints = [] ) {
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try {
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$flags = $this->compressData( $data );
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# Write to external storage if required
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if ( $this->useExternalStore ) {
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// Store and get the URL
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$data = $this->extStoreAccess->insert( $data, [ 'domain' => $this->dbDomain ] );
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if ( !$data ) {
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throw new BlobAccessException( "Failed to store text to external storage" );
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}
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if ( $flags ) {
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$flags .= ',';
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}
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$flags .= 'external';
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// TODO: we could also return an address for the external store directly here.
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// That would mean bypassing the text table entirely when the external store is
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// used. We'll need to assess expected fallout before doing that.
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}
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$dbw = $this->getDBConnection( DB_MASTER );
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$old_id = $dbw->nextSequenceValue( 'text_old_id_seq' );
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$dbw->insert(
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'text',
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[
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'old_id' => $old_id,
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'old_text' => $data,
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'old_flags' => $flags,
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],
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__METHOD__
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);
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$textId = $dbw->insertId();
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return self::makeAddressFromTextId( $textId );
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} catch ( MWException $e ) {
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throw new BlobAccessException( $e->getMessage(), 0, $e );
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}
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}
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/**
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* Retrieve a blob, given an address.
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* Currently hardcoded to the 'text' table storage engine.
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*
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* MCR migration note: this replaces Revision::loadText
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*
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* @param string $blobAddress
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* @param int $queryFlags
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*
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* @throws BlobAccessException
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* @return string
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*/
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public function getBlob( $blobAddress, $queryFlags = 0 ) {
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Assert::parameterType( 'string', $blobAddress, '$blobAddress' );
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$error = null;
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$blob = $this->cache->getWithSetCallback(
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$this->getCacheKey( $blobAddress ),
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$this->getCacheTTL(),
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function ( $unused, &$ttl, &$setOpts ) use ( $blobAddress, $queryFlags, &$error ) {
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// Ignore $setOpts; blobs are immutable and negatives are not cached
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list( $result, $errors ) = $this->fetchBlobs( [ $blobAddress ], $queryFlags );
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// No negative caching; negative hits on text rows may be due to corrupted replica DBs
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$error = $errors[$blobAddress] ?? null;
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return $result[$blobAddress];
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},
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[ 'pcGroup' => self::TEXT_CACHE_GROUP, 'pcTTL' => IExpiringStore::TTL_PROC_LONG ]
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);
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if ( $error ) {
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throw new BlobAccessException( $error );
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}
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Assert::postcondition( is_string( $blob ), 'Blob must not be null' );
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return $blob;
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}
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/**
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* A batched version of BlobStore::getBlob.
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*
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* @param string[] $blobAddresses An array of blob addresses.
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* @param int $queryFlags See IDBAccessObject.
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* @throws BlobAccessException
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* @return StatusValue A status with a map of blobAddress => binary blob data or null
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* if fetching the blob has failed. Fetch failures errors are the
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* warnings in the status object.
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* @since 1.34
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*/
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public function getBlobBatch( $blobAddresses, $queryFlags = 0 ) {
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// FIXME: All caching has temporarily been removed in I94c6f9ba7b9caeeb due to T235188.
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// Caching behavior should be restored by reverting I94c6f9ba7b9caeeb as soon as
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// the root cause of T235188 has been resolved.
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list( $blobsByAddress, $errors ) = $this->fetchBlobs( $blobAddresses, $queryFlags );
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$blobsByAddress = array_map( function ( $blob ) {
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return $blob === false ? null : $blob;
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}, $blobsByAddress );
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$result = StatusValue::newGood( $blobsByAddress );
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if ( $errors ) {
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foreach ( $errors as $error ) {
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$result->warning( 'internalerror', $error );
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}
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}
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return $result;
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}
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/**
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* MCR migration note: this corresponds to Revision::fetchText
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*
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* @param string[] $blobAddresses
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* @param int $queryFlags
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*
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* @throws BlobAccessException
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* @return array [ $result, $errors ] A map of blob addresses to successfully fetched blobs
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* or false if fetch failed, plus and array of errors
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*/
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private function fetchBlobs( $blobAddresses, $queryFlags ) {
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$textIdToBlobAddress = [];
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$result = [];
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$errors = [];
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foreach ( $blobAddresses as $blobAddress ) {
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try {
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list( $schema, $id ) = self::splitBlobAddress( $blobAddress );
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} catch ( InvalidArgumentException $ex ) {
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throw new BlobAccessException( $ex->getMessage(), 0, $ex );
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}
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// TODO: MCR: also support 'ex' schema with ExternalStore URLs, plus flags encoded in the URL!
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if ( $schema === 'bad' ) {
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// Database row was marked as "known bad", no need to trigger an error.
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wfDebug(
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__METHOD__
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. ": loading known-bad content ($blobAddress), returning empty string"
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);
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$result[$blobAddress] = '';
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continue;
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} elseif ( $schema === 'tt' ) {
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$textId = intval( $id );
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if ( $textId < 1 || $id !== (string)$textId ) {
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$errors[$blobAddress] = "Bad blob address: $blobAddress";
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$result[$blobAddress] = false;
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}
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$textIdToBlobAddress[$textId] = $blobAddress;
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} else {
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$errors[$blobAddress] = "Unknown blob address schema: $schema";
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$result[$blobAddress] = false;
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continue;
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}
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}
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$textIds = array_keys( $textIdToBlobAddress );
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if ( !$textIds ) {
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return [ $result, $errors ];
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}
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// Callers doing updates will pass in READ_LATEST as usual. Since the text/blob tables
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// do not normally get rows changed around, set READ_LATEST_IMMUTABLE in those cases.
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$queryFlags |= DBAccessObjectUtils::hasFlags( $queryFlags, self::READ_LATEST )
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? self::READ_LATEST_IMMUTABLE
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: 0;
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list( $index, $options, $fallbackIndex, $fallbackOptions ) =
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DBAccessObjectUtils::getDBOptions( $queryFlags );
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// Text data is immutable; check replica DBs first.
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$dbConnection = $this->getDBConnection( $index );
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$rows = $dbConnection->select(
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'text',
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[ 'old_id', 'old_text', 'old_flags' ],
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[ 'old_id' => $textIds ],
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__METHOD__,
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$options
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);
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// Fallback to DB_MASTER in some cases if not all the rows were found, using the appropriate
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// options, such as FOR UPDATE to avoid missing rows due to REPEATABLE-READ.
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if ( $dbConnection->numRows( $rows ) !== count( $textIds ) && $fallbackIndex !== null ) {
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$fetchedTextIds = [];
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foreach ( $rows as $row ) {
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$fetchedTextIds[] = $row->old_id;
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}
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$missingTextIds = array_diff( $textIds, $fetchedTextIds );
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$dbConnection = $this->getDBConnection( $fallbackIndex );
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$rowsFromFallback = $dbConnection->select(
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'text',
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[ 'old_id', 'old_text', 'old_flags' ],
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[ 'old_id' => $missingTextIds ],
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__METHOD__,
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$fallbackOptions
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);
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$appendIterator = new AppendIterator();
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$appendIterator->append( $rows );
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$appendIterator->append( $rowsFromFallback );
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$rows = $appendIterator;
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}
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foreach ( $rows as $row ) {
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$blobAddress = $textIdToBlobAddress[$row->old_id];
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$blob = $this->expandBlob( $row->old_text, $row->old_flags, $blobAddress );
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if ( $blob === false ) {
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$errors[$blobAddress] = "Bad data in text row {$row->old_id}.";
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}
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$result[$blobAddress] = $blob;
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}
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// If we're still missing some of the rows, set errors for missing blobs.
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if ( count( $result ) !== count( $blobAddresses ) ) {
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foreach ( $blobAddresses as $blobAddress ) {
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if ( !isset( $result[$blobAddress ] ) ) {
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$errors[$blobAddress] = "Unable to fetch blob at $blobAddress";
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$result[$blobAddress] = false;
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}
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}
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}
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return [ $result, $errors ];
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}
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/**
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* Get a cache key for a given Blob address.
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*
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* The cache key is constructed in a way that allows cached blobs from the same database
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* to be re-used between wikis. For example, wiki A and wiki B will use the same cache keys
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* for blobs fetched from wiki C.
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*
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* @param string $blobAddress
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* @return string
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*/
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private function getCacheKey( $blobAddress ) {
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return $this->cache->makeGlobalKey(
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'SqlBlobStore-blob',
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$this->dbLoadBalancer->resolveDomainID( $this->dbDomain ),
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$blobAddress
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);
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}
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/**
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* Expand a raw data blob according to the flags given.
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*
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* MCR migration note: this replaces Revision::getRevisionText
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*
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* @note direct use is deprecated, use getBlob() or SlotRecord::getContent() instead.
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* @todo make this private, there should be no need to use this method outside this class.
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*
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* @param string $raw The raw blob data, to be processed according to $flags.
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* May be the blob itself, or the blob compressed, or just the address
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* of the actual blob, depending on $flags.
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* @param string|string[] $flags Blob flags, such as 'external' or 'gzip'.
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* Note that not including 'utf-8' in $flags will cause the data to be decoded
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* according to the legacy encoding specified via setLegacyEncoding.
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* @param string|null $cacheKey A blob address for use in the cache key. If not given,
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* caching is disabled.
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*
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* @return false|string The expanded blob or false on failure
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*/
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public function expandBlob( $raw, $flags, $cacheKey = null ) {
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if ( is_string( $flags ) ) {
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$flags = explode( ',', $flags );
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}
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// Use external methods for external objects, text in table is URL-only then
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if ( in_array( 'external', $flags ) ) {
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$url = $raw;
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$parts = explode( '://', $url, 2 );
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if ( count( $parts ) == 1 || $parts[1] == '' ) {
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return false;
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}
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if ( $cacheKey ) {
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// The cached value should be decompressed, so handle that and return here.
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return $this->cache->getWithSetCallback(
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$this->getCacheKey( $cacheKey ),
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$this->getCacheTTL(),
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function () use ( $url, $flags ) {
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// Ignore $setOpts; blobs are immutable and negatives are not cached
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$blob = $this->extStoreAccess
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->fetchFromURL( $url, [ 'domain' => $this->dbDomain ] );
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return $blob === false ? false : $this->decompressData( $blob, $flags );
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},
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[ 'pcGroup' => self::TEXT_CACHE_GROUP, 'pcTTL' => WANObjectCache::TTL_PROC_LONG ]
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);
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} else {
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$blob = $this->extStoreAccess->fetchFromURL( $url, [ 'domain' => $this->dbDomain ] );
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return $blob === false ? false : $this->decompressData( $blob, $flags );
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}
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} else {
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return $this->decompressData( $raw, $flags );
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}
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}
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/**
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* If $wgCompressRevisions is enabled, we will compress data.
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* The input string is modified in place.
|
|
* Return value is the flags field: contains 'gzip' if the
|
|
* data is compressed, and 'utf-8' if we're saving in UTF-8
|
|
* mode.
|
|
*
|
|
* MCR migration note: this replaces Revision::compressRevisionText
|
|
*
|
|
* @note direct use is deprecated!
|
|
* @todo make this private, there should be no need to use this method outside this class.
|
|
*
|
|
* @param string &$blob
|
|
*
|
|
* @return string
|
|
*/
|
|
public function compressData( &$blob ) {
|
|
$blobFlags = [];
|
|
|
|
// Revisions not marked as UTF-8 will have legacy decoding applied by decompressData().
|
|
// XXX: if $this->legacyEncoding is not set, we could skip this. That would however be
|
|
// risky, since $this->legacyEncoding being set in the future would lead to data corruption.
|
|
$blobFlags[] = 'utf-8';
|
|
|
|
if ( $this->compressBlobs ) {
|
|
if ( function_exists( 'gzdeflate' ) ) {
|
|
$deflated = gzdeflate( $blob );
|
|
|
|
if ( $deflated === false ) {
|
|
wfLogWarning( __METHOD__ . ': gzdeflate() failed' );
|
|
} else {
|
|
$blob = $deflated;
|
|
$blobFlags[] = 'gzip';
|
|
}
|
|
} else {
|
|
wfDebug( __METHOD__ . " -- no zlib support, not compressing" );
|
|
}
|
|
}
|
|
return implode( ',', $blobFlags );
|
|
}
|
|
|
|
/**
|
|
* Re-converts revision text according to its flags.
|
|
*
|
|
* MCR migration note: this replaces Revision::decompressRevisionText
|
|
*
|
|
* @note direct use is deprecated, use getBlob() or SlotRecord::getContent() instead.
|
|
* @todo make this private, there should be no need to use this method outside this class.
|
|
*
|
|
* @param string $blob Blob in compressed/encoded form.
|
|
* @param array $blobFlags Compression flags, such as 'gzip'.
|
|
* Note that not including 'utf-8' in $blobFlags will cause the data to be decoded
|
|
* according to the legacy encoding specified via setLegacyEncoding.
|
|
*
|
|
* @return string|bool Decompressed text, or false on failure
|
|
*/
|
|
public function decompressData( $blob, array $blobFlags ) {
|
|
// Revision::decompressRevisionText accepted false here, so defend against that
|
|
Assert::parameterType( 'string', $blob, '$blob' );
|
|
|
|
if ( in_array( 'error', $blobFlags ) ) {
|
|
// Error row, return false
|
|
return false;
|
|
}
|
|
|
|
if ( in_array( 'gzip', $blobFlags ) ) {
|
|
# Deal with optional compression of archived pages.
|
|
# This can be done periodically via maintenance/compressOld.php, and
|
|
# as pages are saved if $wgCompressRevisions is set.
|
|
$blob = gzinflate( $blob );
|
|
|
|
if ( $blob === false ) {
|
|
wfWarn( __METHOD__ . ': gzinflate() failed' );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if ( in_array( 'object', $blobFlags ) ) {
|
|
# Generic compressed storage
|
|
$obj = unserialize( $blob );
|
|
if ( !is_object( $obj ) ) {
|
|
// Invalid object
|
|
return false;
|
|
}
|
|
$blob = $obj->getText();
|
|
}
|
|
|
|
// Needed to support old revisions left over from from the 1.4 / 1.5 migration.
|
|
if ( $blob !== false && $this->legacyEncoding
|
|
&& !in_array( 'utf-8', $blobFlags ) && !in_array( 'utf8', $blobFlags )
|
|
) {
|
|
# Old revisions kept around in a legacy encoding?
|
|
# Upconvert on demand.
|
|
# ("utf8" checked for compatibility with some broken
|
|
# conversion scripts 2008-12-30)
|
|
# Even with //IGNORE iconv can whine about illegal characters in
|
|
# *input* string. We just ignore those too.
|
|
# REF: https://bugs.php.net/bug.php?id=37166
|
|
# REF: https://phabricator.wikimedia.org/T18885
|
|
AtEase::suppressWarnings();
|
|
$blob = iconv( $this->legacyEncoding, 'UTF-8//IGNORE', $blob );
|
|
AtEase::restoreWarnings();
|
|
}
|
|
|
|
return $blob;
|
|
}
|
|
|
|
/**
|
|
* Get the text cache TTL
|
|
*
|
|
* MCR migration note: this replaces Revision::getCacheTTL
|
|
*
|
|
* @return int
|
|
*/
|
|
private function getCacheTTL() {
|
|
if ( $this->cache->getQoS( WANObjectCache::ATTR_EMULATION )
|
|
<= WANObjectCache::QOS_EMULATION_SQL
|
|
) {
|
|
// Do not cache RDBMs blobs in...the RDBMs store
|
|
$ttl = WANObjectCache::TTL_UNCACHEABLE;
|
|
} else {
|
|
$ttl = $this->cacheExpiry ?: WANObjectCache::TTL_UNCACHEABLE;
|
|
}
|
|
|
|
return $ttl;
|
|
}
|
|
|
|
/**
|
|
* Returns an ID corresponding to the old_id field in the text table, corresponding
|
|
* to the given $address.
|
|
*
|
|
* Currently, $address must start with 'tt:' followed by a decimal integer representing
|
|
* the old_id; if $address does not start with 'tt:', null is returned. However,
|
|
* the implementation may change to insert rows into the text table on the fly.
|
|
* This implies that this method cannot be static.
|
|
*
|
|
* @note This method exists for use with the text table based storage schema.
|
|
* It should not be assumed that is will function with all future kinds of content addresses.
|
|
*
|
|
* @deprecated since 1.31, so don't assume that all blob addresses refer to a row in the text
|
|
* table. This method should become private once the relevant refactoring in WikiPage is
|
|
* complete.
|
|
*
|
|
* @param string $address
|
|
*
|
|
* @return int|null
|
|
*/
|
|
public function getTextIdFromAddress( $address ) {
|
|
list( $schema, $id, ) = self::splitBlobAddress( $address );
|
|
|
|
if ( $schema !== 'tt' ) {
|
|
return null;
|
|
}
|
|
|
|
$textId = intval( $id );
|
|
|
|
if ( !$textId || $id !== (string)$textId ) {
|
|
throw new InvalidArgumentException( "Malformed text_id: $id" );
|
|
}
|
|
|
|
return $textId;
|
|
}
|
|
|
|
/**
|
|
* Returns an address referring to content stored in the text table row with the given ID.
|
|
* The address schema for blobs stored in the text table is "tt:" followed by an integer
|
|
* that corresponds to a value of the old_id field.
|
|
*
|
|
* @internal
|
|
* @note This method should not be used by regular application logic. It is public so
|
|
* maintenance scripts can use it for bulk operations on the text table.
|
|
*
|
|
* @param int $id
|
|
*
|
|
* @return string
|
|
*/
|
|
public static function makeAddressFromTextId( $id ) {
|
|
return 'tt:' . $id;
|
|
}
|
|
|
|
/**
|
|
* Splits a blob address into three parts: the schema, the ID, and parameters/flags.
|
|
*
|
|
* @since 1.33
|
|
*
|
|
* @param string $address
|
|
*
|
|
* @throws InvalidArgumentException
|
|
* @return array [ $schema, $id, $parameters ], with $parameters being an assoc array.
|
|
*/
|
|
public static function splitBlobAddress( $address ) {
|
|
if ( !preg_match( '/^([-+.\w]+):([^\s?]+)(\?([^\s]*))?$/', $address, $m ) ) {
|
|
throw new InvalidArgumentException( "Bad blob address: $address" );
|
|
}
|
|
|
|
$schema = strtolower( $m[1] );
|
|
$id = $m[2];
|
|
$parameters = isset( $m[4] ) ? wfCgiToArray( $m[4] ) : [];
|
|
|
|
return [ $schema, $id, $parameters ];
|
|
}
|
|
|
|
public function isReadOnly() {
|
|
if ( $this->useExternalStore && $this->extStoreAccess->isReadOnly() ) {
|
|
return true;
|
|
}
|
|
|
|
return ( $this->getDBLoadBalancer()->getReadOnlyReason() !== false );
|
|
}
|
|
}
|