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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | namespace Wikimedia\Rdbms; |
| 21 | |
| 22 | use InvalidArgumentException; |
| 23 | |
| 24 | /** |
| 25 | * Trivial LoadBalancer that always returns an injected connection handle. |
| 26 | * |
| 27 | * @ingroup Database |
| 28 | */ |
| 29 | class LoadBalancerSingle extends LoadBalancer { |
| 30 | /** @var Database */ |
| 31 | private $conn; |
| 32 | |
| 33 | /** |
| 34 | * You probably want to use {@link newFromConnection} instead. |
| 35 | * |
| 36 | * @param array $params An associative array with one member: |
| 37 | * - connection: An IDatabase connection object |
| 38 | */ |
| 39 | public function __construct( array $params ) { |
| 40 | /** @var Database $conn */ |
| 41 | $conn = $params['connection'] ?? null; |
| 42 | if ( !$conn ) { |
| 43 | throw new InvalidArgumentException( "Missing 'connection' argument." ); |
| 44 | } |
| 45 | |
| 46 | $this->conn = $conn; |
| 47 | |
| 48 | parent::__construct( [ |
| 49 | 'servers' => [ [ |
| 50 | 'type' => $conn->getType(), |
| 51 | 'host' => $conn->getServer(), |
| 52 | 'dbname' => $conn->getDBname(), |
| 53 | 'load' => 1, |
| 54 | ] ], |
| 55 | 'trxProfiler' => $params['trxProfiler'] ?? null, |
| 56 | 'srvCache' => $params['srvCache'] ?? null, |
| 57 | 'wanCache' => $params['wanCache'] ?? null, |
| 58 | 'localDomain' => $params['localDomain'] ?? $this->conn->getDomainID(), |
| 59 | 'readOnlyReason' => $params['readOnlyReason'] ?? false, |
| 60 | 'clusterName' => $params['clusterName'] ?? null, |
| 61 | ] ); |
| 62 | |
| 63 | if ( isset( $params['readOnlyReason'] ) ) { |
| 64 | $conn->setLBInfo( $conn::LB_READ_ONLY_REASON, $params['readOnlyReason'] ); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * @param IDatabase $db Live connection handle |
| 70 | * @param array $params Parameter map to LoadBalancerSingle::__constructs() |
| 71 | * @return LoadBalancerSingle |
| 72 | * @since 1.28 |
| 73 | */ |
| 74 | public static function newFromConnection( IDatabase $db, array $params = [] ) { |
| 75 | return new static( array_merge( |
| 76 | [ 'localDomain' => $db->getDomainID() ], |
| 77 | $params, |
| 78 | [ 'connection' => $db ] |
| 79 | ) ); |
| 80 | } |
| 81 | |
| 82 | protected function reallyOpenConnection( $i, DatabaseDomain $domain, array $lbInfo ) { |
| 83 | foreach ( $lbInfo as $k => $v ) { |
| 84 | $this->conn->setLBInfo( $k, $v ); |
| 85 | } |
| 86 | |
| 87 | return $this->conn; |
| 88 | } |
| 89 | |
| 90 | public function reuseConnection( IDatabase $conn ) { |
| 91 | // do nothing since the connection was injected |
| 92 | } |
| 93 | |
| 94 | public function __destruct() { |
| 95 | // do nothing since the connection was injected |
| 96 | } |
| 97 | } |