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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Page;
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleArrayFromResult;
use Wikimedia\MapCacheLRU\MapCacheLRU;
use Wikimedia\Rdbms\IConnectionProvider;
/**
* Gives access to properties of a page.
*
* @since 1.27
* @ingroup Page
*/
class PageProps {
/* TTL in seconds */
private const CACHE_TTL = 10;
/* max cached pages */
private const CACHE_SIZE = 100;
private LinkBatchFactory $linkBatchFactory;
private IConnectionProvider $dbProvider;
private MapCacheLRU $cache;
public function __construct(
LinkBatchFactory $linkBatchFactory,
IConnectionProvider $dbProvider
) {
$this->linkBatchFactory = $linkBatchFactory;
$this->dbProvider = $dbProvider;
$this->cache = new MapCacheLRU( self::CACHE_SIZE );
}
/**
* Ensure that cache has at least this size
* @param int $size
*/
public function ensureCacheSize( $size ) {
if ( $this->cache->getMaxSize() < $size ) {
$this->cache->setMaxSize( $size );
}
}
/**
* Fetch one or more properties for one or more Titles.
*
* Returns an associative array mapping page ID to property value.
*
* If a single Title is provided without an array, the output will still
* be returned as an array by page ID.
*
* Pages in the provided set of Titles that do not have a value for
* any of the properties will not appear in the returned array.
*
* If a single property name is requested, it does not need to be passed
* in as an array. In that case, the return array will map directly from
* page ID to property value. Otherwise, a multi-dimensional array is
* returned keyed by page ID, then property name, to property value.
*
* An empty array will be returned if no matching properties were found.
*
* @param iterable<PageIdentity>|PageIdentity $titles
* @param string[]|string $propertyNames
* @return array<int,string|array<string,string>> Keyed by page ID and property name
* to property value
*/
public function getProperties( $titles, $propertyNames ) {
if ( is_array( $propertyNames ) ) {
$gotArray = true;
} else {
$propertyNames = [ $propertyNames ];
$gotArray = false;
}
$values = [];
$goodIDs = $this->getGoodIDs( $titles );
$queryIDs = [];
foreach ( $goodIDs as $pageID ) {
foreach ( $propertyNames as $propertyName ) {
$propertyValue = $this->getCachedProperty( $pageID, $propertyName );
if ( $propertyValue === false ) {
$queryIDs[] = $pageID;
break;
} elseif ( $gotArray ) {
$values[$pageID][$propertyName] = $propertyValue;
} else {
$values[$pageID] = $propertyValue;
}
}
}
if ( $queryIDs ) {
$queryBuilder = $this->dbProvider->getReplicaDatabase()->newSelectQueryBuilder();
$queryBuilder->select( [ 'pp_page', 'pp_propname', 'pp_value' ] )
->from( 'page_props' )
->where( [ 'pp_page' => $queryIDs, 'pp_propname' => $propertyNames ] )
->caller( __METHOD__ );
$result = $queryBuilder->fetchResultSet();
foreach ( $result as $row ) {
$pageID = $row->pp_page;
$propertyName = $row->pp_propname;
$propertyValue = $row->pp_value;
$this->cache->setField( $pageID, $propertyName, $propertyValue );
if ( $gotArray ) {
$values[$pageID][$propertyName] = $propertyValue;
} else {
$values[$pageID] = $propertyValue;
}
}
}
return $values;
}
/**
* Get all page properties of one or more page titles.
*
* Given one or more Titles, returns an array keyed by page ID to another
* array from property names to property values.
*
* If a single Title is provided without an array, the output will still
* be returned as an array by page ID.
*
* Pages in the provided set of Titles that do have no page properties,
* will not get a page ID key in the returned array.
*
* An empty array will be returned if none of the titles have any page properties.
*
* @param iterable<PageIdentity>|PageIdentity $titles
* @return array<int,array<string,string>> Keyed by page ID and property name to property value
*/
public function getAllProperties( $titles ) {
$values = [];
$goodIDs = $this->getGoodIDs( $titles );
$queryIDs = [];
foreach ( $goodIDs as $pageID ) {
$pageProperties = $this->getCachedProperties( $pageID );
if ( $pageProperties === false ) {
$queryIDs[] = $pageID;
} else {
$values[$pageID] = $pageProperties;
}
}
if ( $queryIDs != [] ) {
$queryBuilder = $this->dbProvider->getReplicaDatabase()->newSelectQueryBuilder();
$queryBuilder->select( [ 'pp_page', 'pp_propname', 'pp_value' ] )
->from( 'page_props' )
->where( [ 'pp_page' => $queryIDs ] )
->caller( __METHOD__ );
$result = $queryBuilder->fetchResultSet();
$currentPageID = 0;
$pageProperties = [];
foreach ( $result as $row ) {
$pageID = $row->pp_page;
if ( $currentPageID != $pageID ) {
if ( $pageProperties ) {
// @phan-suppress-next-line PhanTypeMismatchArgument False positive
$this->cacheProperties( $currentPageID, $pageProperties );
$values[$currentPageID] = $pageProperties;
}
$currentPageID = $pageID;
$pageProperties = [];
}
$pageProperties[$row->pp_propname] = $row->pp_value;
}
if ( $pageProperties != [] ) {
// @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable pageID set when used
// @phan-suppress-next-line PhanTypeMismatchArgumentNullable pageID set when used
$this->cacheProperties( $pageID, $pageProperties );
// @phan-suppress-next-next-line PhanPossiblyUndeclaredVariable pageID set when used
// @phan-suppress-next-line PhanTypeMismatchDimAssignment pageID set when used
$values[$pageID] = $pageProperties;
}
}
return $values;
}
/**
* @param iterable<PageIdentity>|PageIdentity $titles
* @return int[] List of good page IDs
*/
private function getGoodIDs( $titles ) {
$result = [];
if ( is_iterable( $titles ) ) {
if ( $titles instanceof TitleArrayFromResult ||
( is_array( $titles ) && reset( $titles ) instanceof Title
) ) {
// If the first element is a Title, assume all elements are Titles,
// and pre-fetch their IDs using a batch query. For PageIdentityValues
// or PageStoreRecords, this is not necessary, since they already
// know their ID.
$this->linkBatchFactory->newLinkBatch( $titles )->execute();
}
foreach ( $titles as $title ) {
// Until we only allow ProperPageIdentity, Title objects
// can deceive us with an unexpected Special page
if ( $title->canExist() ) {
$pageID = $title->getId();
if ( $pageID > 0 ) {
$result[] = $pageID;
}
}
}
} else {
// Until we only allow ProperPageIdentity, Title objects
// can deceive us with an unexpected Special page
if ( $titles->canExist() ) {
$pageID = $titles->getId();
if ( $pageID > 0 ) {
$result[] = $pageID;
}
}
}
return $result;
}
/**
* Get a property from the cache.
*
* @param int $pageID page ID of page being queried
* @param string $propertyName name of property being queried
* @return string|bool property value array or false if not found
*/
private function getCachedProperty( $pageID, $propertyName ) {
if ( $this->cache->hasField( $pageID, $propertyName, self::CACHE_TTL ) ) {
return $this->cache->getField( $pageID, $propertyName );
}
if ( $this->cache->hasField( 0, $pageID, self::CACHE_TTL ) ) {
$pageProperties = $this->cache->getField( 0, $pageID );
if ( isset( $pageProperties[$propertyName] ) ) {
return $pageProperties[$propertyName];
}
}
return false;
}
/**
* Get properties from the cache.
*
* @param int $pageID page ID of page being queried
* @return string|bool property value array or false if not found
*/
private function getCachedProperties( $pageID ) {
if ( $this->cache->hasField( 0, $pageID, self::CACHE_TTL ) ) {
return $this->cache->getField( 0, $pageID );
}
return false;
}
/**
* Save properties to the cache.
*
* @param int $pageID page ID of page being cached
* @param string[] $pageProperties associative array of page properties to be cached
*/
private function cacheProperties( $pageID, $pageProperties ) {
$this->cache->clear( $pageID );
$this->cache->setField( 0, $pageID, $pageProperties );
}
}