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<?php |
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/** |
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* Generator of database load balancing objects. |
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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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* @file |
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* @ingroup Database |
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*/ |
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/** |
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* A simple single-master LBFactory that gets its configuration from the b/c globals |
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*/ |
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class LBFactorySimple extends LBFactory { |
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/** @var LoadBalancer */ |
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private $mainLB; |
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/** @var LoadBalancer[] */ |
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private $extLBs = []; |
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/** @var string */ |
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private $loadMonitorClass; |
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public function __construct( array $conf ) { |
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parent::__construct( $conf ); |
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$this->loadMonitorClass = isset( $conf['loadMonitorClass'] ) |
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? $conf['loadMonitorClass'] |
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: null; |
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} |
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/** |
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* @param bool|string $wiki |
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* @return LoadBalancer |
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*/ |
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public function newMainLB( $wiki = false ) { |
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global $wgDBservers; |
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if ( is_array( $wgDBservers ) ) { |
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$servers = $wgDBservers; |
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foreach ( $servers as $i => &$server ) { |
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if ( $i == 0 ) { |
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$server['master'] = true; |
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} else { |
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$server['slave'] = true; |
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} |
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$server += [ 'flags' => DBO_DEFAULT ]; |
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} |
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} else { |
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global $wgDBserver, $wgDBuser, $wgDBpassword, $wgDBname, $wgDBtype, $wgDebugDumpSql; |
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global $wgDBssl, $wgDBcompress; |
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$flags = DBO_DEFAULT; |
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if ( $wgDebugDumpSql ) { |
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$flags |= DBO_DEBUG; |
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} |
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if ( $wgDBssl ) { |
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$flags |= DBO_SSL; |
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} |
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if ( $wgDBcompress ) { |
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$flags |= DBO_COMPRESS; |
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} |
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$servers = [ [ |
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'host' => $wgDBserver, |
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'user' => $wgDBuser, |
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'password' => $wgDBpassword, |
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'dbname' => $wgDBname, |
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'type' => $wgDBtype, |
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'load' => 1, |
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'flags' => $flags, |
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'master' => true |
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] ]; |
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} |
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return $this->newLoadBalancer( $servers ); |
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} |
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/** |
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* @param bool|string $wiki |
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* @return LoadBalancer |
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*/ |
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public function getMainLB( $wiki = false ) { |
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if ( !isset( $this->mainLB ) ) { |
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$this->mainLB = $this->newMainLB( $wiki ); |
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$this->mainLB->parentInfo( [ 'id' => 'main' ] ); |
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$this->chronProt->initLB( $this->mainLB ); |
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} |
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return $this->mainLB; |
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} |
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/** |
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* @throws MWException |
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* @param string $cluster |
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* @param bool|string $wiki |
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* @return LoadBalancer |
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*/ |
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protected function newExternalLB( $cluster, $wiki = false ) { |
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global $wgExternalServers; |
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if ( !isset( $wgExternalServers[$cluster] ) ) { |
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throw new MWException( __METHOD__ . ": Unknown cluster \"$cluster\"" ); |
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} |
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return $this->newLoadBalancer( $wgExternalServers[$cluster] ); |
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} |
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/** |
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* @param string $cluster |
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* @param bool|string $wiki |
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* @return array |
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*/ |
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View Code Duplication |
public function &getExternalLB( $cluster, $wiki = false ) { |
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if ( !isset( $this->extLBs[$cluster] ) ) { |
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$this->extLBs[$cluster] = $this->newExternalLB( $cluster, $wiki ); |
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$this->extLBs[$cluster]->parentInfo( [ 'id' => "ext-$cluster" ] ); |
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$this->chronProt->initLB( $this->extLBs[$cluster] ); |
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} |
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return $this->extLBs[$cluster]; |
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} |
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private function newLoadBalancer( array $servers ) { |
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return new LoadBalancer( [ |
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'servers' => $servers, |
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'loadMonitor' => $this->loadMonitorClass, |
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'readOnlyReason' => $this->readOnlyReason, |
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'trxProfiler' => $this->trxProfiler, |
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'srvCache' => $this->srvCache, |
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'wanCache' => $this->wanCache |
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] ); |
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} |
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/** |
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* Execute a function for each tracked load balancer |
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* The callback is called with the load balancer as the first parameter, |
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* and $params passed as the subsequent parameters. |
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* |
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* @param callable $callback |
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* @param array $params |
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*/ |
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public function forEachLB( $callback, array $params = [] ) { |
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if ( isset( $this->mainLB ) ) { |
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call_user_func_array( $callback, array_merge( [ $this->mainLB ], $params ) ); |
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} |
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foreach ( $this->extLBs as $lb ) { |
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call_user_func_array( $callback, array_merge( [ $lb ], $params ) ); |
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} |
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} |
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} |
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wikimedia /
mediawiki
