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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 Wikimedia\Rdbms; use InvalidArgumentException; /** * LoadBalancer manager for sites with one "main" cluster and any number of "external" clusters * * @see LBFactoryMulti * * The class allows for large site farms to split up their data in the following ways: * - Vertically shard compact site-specific data by site (e.g. page/comment metadata) * - Vertically shard compact global data by module (e.g. account/notification data) * - Horizontally shard any bulk data by blob key (e.g. page/comment content) * * @ingroup Database */ class LBFactorySimple extends LBFactory { /** @var LoadBalancer */ private $mainLB; /** @var LoadBalancer[] */ private $externalLBs = []; /** @var array Configuration for the LoadMonitor to use within LoadBalancer instances */ private $loadMonitorConfig; /** @var array[] Map of (server index => server config map) */ private $mainServers; /** @var array[][] Map of (cluster => server index => server config map) */ private $externalServersByCluster = []; /** * @see LBFactory::__construct() * @param array $conf Additional parameters include: * - servers : list of server config maps to Database::factory(). * Additionally, the server maps should have a 'load' key, which is used to decide * how often clients connect to one server verses the others. A 'max lag' key should * also be set on server maps, indicating how stale the data can be before the load * balancer tries to avoid using it. The map can have 'is static' set to disable blocking * replication sync checks (intended for archive servers with unchanging data). * - externalClusters : map of cluster names to server arrays. The servers arrays have the * same format as "servers" above. * - loadMonitor: LoadMonitor::__construct() parameters with "class" field. [optional] */ public function __construct( array $conf ) { parent::__construct( $conf ); $this->mainServers = $conf['servers'] ?? []; foreach ( ( $conf['externalClusters'] ?? [] ) as $cluster => $servers ) { foreach ( $servers as $index => $server ) { $this->externalServersByCluster[$cluster][$index] = $server; } } if ( isset( $conf['loadMonitor'] ) ) { $this->loadMonitorConfig = $conf['loadMonitor']; } elseif ( isset( $conf['loadMonitorClass'] ) ) { // b/c $this->loadMonitorConfig = [ 'class' => $conf['loadMonitorClass'] ]; } else { $this->loadMonitorConfig = [ 'class' => LoadMonitor::class ]; } } public function newMainLB( $domain = false ): ILoadBalancerForOwner { return $this->newLoadBalancer( self::CLUSTER_MAIN_DEFAULT, $this->mainServers ); } public function getMainLB( $domain = false ): ILoadBalancer { $this->mainLB ??= $this->newMainLB( $domain ); return $this->mainLB; } public function newExternalLB( $cluster ): ILoadBalancerForOwner { if ( !isset( $this->externalServersByCluster[$cluster] ) ) { throw new InvalidArgumentException( "Unknown cluster '$cluster'." ); } return $this->newLoadBalancer( $cluster, $this->externalServersByCluster[$cluster] ); } public function getExternalLB( $cluster ): ILoadBalancer { if ( !isset( $this->externalLBs[$cluster] ) ) { $this->externalLBs[$cluster] = $this->newExternalLB( $cluster ); } return $this->externalLBs[$cluster]; } public function getAllMainLBs(): array { return [ self::CLUSTER_MAIN_DEFAULT => $this->getMainLB() ]; } public function getAllExternalLBs(): array { $lbs = []; foreach ( $this->externalServersByCluster as $cluster => $_ ) { $lbs[$cluster] = $this->getExternalLB( $cluster ); } return $lbs; } private function newLoadBalancer( string $clusterName, array $servers ) { $lb = new LoadBalancer( array_merge( $this->baseLoadBalancerParams(), [ 'servers' => $servers, 'loadMonitor' => $this->loadMonitorConfig, 'clusterName' => $clusterName ] ) ); $this->initLoadBalancer( $lb ); return $lb; } protected function getLBsForOwner() { if ( $this->mainLB !== null ) { yield $this->mainLB; } foreach ( $this->externalLBs as $lb ) { yield $lb; } } }
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