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<?php
declare( strict_types = 1 );
namespace MediaWiki\Extension\Translate\MessageProcessing;
use MediaWiki\Extension\Translate\MessageGroupProcessing\MessageGroups;
use MediaWiki\Extension\Translate\Utilities\Utilities;
use Wikimedia\Rdbms\IConnectionProvider;
/**
* Offers functionality for reading and updating Translate group
* related metadata
*
* @author Niklas Laxström
* @author Santhosh Thottingal
* @copyright Copyright © 2012-2013, Niklas Laxström, Santhosh Thottingal
* @license GPL-2.0-or-later
*/
class MessageGroupMetadata {
/** @var int Threshold for query batching */
private const MAX_ITEMS_PER_QUERY = 2000;
/** Map of (database group id => key => value) */
private array $cache = [];
private ?array $priorityCache = null;
public function __construct( private readonly IConnectionProvider $dbProvider ) {
}
public function preloadGroups( array $groups, string $caller ): void {
$dbGroupIds = array_map( $this->getGroupIdForDatabase( ... ), $groups );
$missing = array_keys( array_diff_key( array_flip( $dbGroupIds ), $this->cache ) );
if ( !$missing ) {
return;
}
$functionName = __METHOD__ . " (for $caller)";
$this->cache += array_fill_keys( $missing, null ); // cache negatives
// TODO: Ideally, this should use the injected ILoadBalancer to make it mockable.
$dbr = Utilities::getSafeReadDB();
$chunks = array_chunk( $missing, self::MAX_ITEMS_PER_QUERY );
foreach ( $chunks as $chunk ) {
$res = $dbr->newSelectQueryBuilder()
->select( [ 'tmd_group', 'tmd_key', 'tmd_value' ] )
->from( 'translate_metadata' )
->where( [ 'tmd_group' => array_map( strval( ... ), $chunk ) ] )
->caller( $functionName )
->fetchResultSet();
foreach ( $res as $row ) {
$this->cache[$row->tmd_group][$row->tmd_key] = $row->tmd_value;
}
}
}
/**
* Get a metadata value for the given group and key.
* @param string $group The group name
* @param string $key Metadata key
*/
public function get( string $group, string $key ): string|false {
$this->preloadGroups( [ $group ], __METHOD__ );
return $this->cache[$this->getGroupIdForDatabase( $group )][$key] ?? false;
}
/**
* Get a metadata value for the given group and key.
* If it does not exist, return the default value.
*/
public function getWithDefaultValue( string $group, string $key, ?string $defaultValue ): ?string {
$value = $this->get( $group, $key );
return $value === false ? $defaultValue : $value;
}
/**
* Set a metadata value for the given group and metadata key. Updates the
* value if already existing.
* @param string $groupId The group id
* @param string $key Metadata key
* @param string|false $value Metadata value, false to delete
*/
public function set( string $groupId, string $key, string|false $value ): void {
$dbw = $this->dbProvider->getPrimaryDatabase();
$dbGroupId = $this->getGroupIdForDatabase( $groupId );
$data = [ 'tmd_group' => $dbGroupId, 'tmd_key' => $key, 'tmd_value' => $value ];
if ( $value === false ) {
unset( $data['tmd_value'] );
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'translate_metadata' )
->where( $data )
->caller( __METHOD__ )
->execute();
unset( $this->cache[$dbGroupId][$key] );
} else {
$dbw->newReplaceQueryBuilder()
->replaceInto( 'translate_metadata' )
->uniqueIndexFields( [ 'tmd_group', 'tmd_key' ] )
->row( $data )
->caller( __METHOD__ )
->execute();
$this->cache[$dbGroupId][$key] = $value;
}
$this->priorityCache = null;
}
/**
* Wrapper for getting subgroups.
* @return string[]|null
*/
public function getSubgroups( string $groupId ): ?array {
$groups = $this->get( $groupId, 'subgroups' );
if ( is_string( $groups ) ) {
if ( str_contains( $groups, '|' ) ) {
$groups = explode( '|', $groups );
} else {
$groups = array_map( 'trim', explode( ',', $groups ) );
}
foreach ( $groups as $index => $id ) {
if ( trim( $id ) === '' ) {
unset( $groups[$index] );
}
}
} else {
$groups = null;
}
return $groups;
}
/** Wrapper for setting subgroups. */
public function setSubgroups( string $groupId, array $subgroupIds ): void {
$subgroups = implode( '|', $subgroupIds );
$this->set( $groupId, 'subgroups', $subgroups );
}
/** Wrapper for deleting one wiki aggregate group at once. */
public function deleteGroup( string $groupId ): void {
$dbw = $this->dbProvider->getPrimaryDatabase();
$dbGroupId = $this->getGroupIdForDatabase( $groupId );
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'translate_metadata' )
->where( [ 'tmd_group' => $dbGroupId ] )
->caller( __METHOD__ )
->execute();
$this->cache[ $dbGroupId ] = null;
unset( $this->priorityCache[ $dbGroupId ] );
}
public function isExcluded( string $groupId, string $code ): bool {
if ( $this->priorityCache === null ) {
// TODO: Ideally, this should use the injected ILoadBalancer to make it mockable.
$db = Utilities::getSafeReadDB();
$res = $db->newSelectQueryBuilder()
->select( [
'group' => 'a.tmd_group',
'langs' => 'b.tmd_value',
] )
->from( 'translate_metadata', 'a' )
->leftJoin( 'translate_metadata', 'b', [
'a.tmd_group = b.tmd_group',
'b.tmd_key' => 'prioritylangs',
] )
->where( [
'a.tmd_key' => 'priorityforce',
'a.tmd_value' => 'on'
] )
->caller( __METHOD__ )
->fetchResultSet();
$this->priorityCache = [];
foreach ( $res as $row ) {
$this->priorityCache[$row->group] = isset( $row->langs )
? array_flip( explode( ',', $row->langs ) )
: [];
}
}
$dbGroupId = $this->getGroupIdForDatabase( $groupId );
$isDiscouraged = MessageGroups::getPriority( $groupId ) === 'discouraged';
$hasLimitedLanguages = isset( $this->priorityCache[$dbGroupId] );
$isLanguageIncluded = isset( $this->priorityCache[$dbGroupId][$code] );
return $isDiscouraged || ( $hasLimitedLanguages && !$isLanguageIncluded );
}
/**
* Do a query optimized for page list in Special:PageTranslation
* @param string[] $groupIds
* @param string[] $keys Which metadata keys to load
* @return array<string,array<string,string>>
*/
public function loadBasicMetadataForTranslatablePages( array $groupIds, array $keys ): array {
// TODO: Ideally, this should use the injected ILoadBalancer to make it mockable.
$db = Utilities::getSafeReadDB();
$dbGroupIdMap = [];
foreach ( $groupIds as $groupId ) {
$dbGroupIdMap[ $this->getGroupIdForDatabase( $groupId ) ] = $groupId;
}
$res = $db->newSelectQueryBuilder()
->select( [ 'tmd_group', 'tmd_key', 'tmd_value' ] )
->from( 'translate_metadata' )
->where( [
'tmd_group' => array_keys( $dbGroupIdMap ),
'tmd_key' => $keys,
] )
->caller( __METHOD__ )
->fetchResultSet();
$ret = [];
foreach ( $res as $row ) {
$groupId = $row->tmd_group;
// Remap the db group ids to group id in the response
$ret[ $dbGroupIdMap[ $groupId ] ][ $row->tmd_key ] = $row->tmd_value;
}
return $ret;
}
public function moveMetadata(
string $oldGroupId,
string $newGroupId,
array $metadataKeysToMove
): void {
$this->preloadGroups( [ $oldGroupId, $newGroupId ], __METHOD__ );
foreach ( $metadataKeysToMove as $type ) {
$value = $this->get( $oldGroupId, $type );
if ( $value !== false ) {
$this->set( $oldGroupId, $type, false );
$this->set( $newGroupId, $type, $value );
}
}
}
/**
* @param string $groupId
* @param string[] $metadataKeys
*/
public function clearMetadata( string $groupId, array $metadataKeys ): void {
// remove the entries from metadata table.
foreach ( $metadataKeys as $type ) {
$this->set( $groupId, $type, false );
}
}
/** Get groups ids that have subgroups set up. */
public function getGroupsWithSubgroups(): array {
// TODO: Ideally, this should use the injected ILoadBalancer to make it mockable.
$db = Utilities::getSafeReadDB();
// There is no need to de-hash the group id from the database as
// AggregateGroupsActionApi::generateAggregateGroupId already ensures that the length
// is appropriate
return $db->newSelectQueryBuilder()
->select( 'tmd_group' )
->from( 'translate_metadata' )
->where( [ 'tmd_key' => 'subgroups' ] )
->caller( __METHOD__ )
->fetchFieldValues();
}
private function getGroupIdForDatabase( string $groupId ): string {
// Check if length is more than 200 bytes
if ( strlen( $groupId ) <= 200 ) {
return $groupId;
}
$hash = hash( 'md5', $groupId );
// We take 160 bytes of the original string and append the md5 hash (32 bytes)
return mb_strcut( $groupId, 0, 160 ) . '||' . $hash;
}
}