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Mini Shell
Mini Shell
<?php
/**
* Generator of database load balancing objects.
*
* 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
* @ingroup Database
*/
/**
* A simple single-master LBFactory that gets its configuration from the b/c globals
*/
class LBFactorySimple extends LBFactory {
/** @var LoadBalancer */
private $mainLB;
/** @var LoadBalancer[] */
private $extLBs = [];
/** @var string */
private $loadMonitorClass;
public function __construct( array $conf ) {
parent::__construct( $conf );
$this->loadMonitorClass = isset( $conf['loadMonitorClass'] )
? $conf['loadMonitorClass']
: null;
}
/**
* @param bool|string $wiki
* @return LoadBalancer
*/
public function newMainLB( $wiki = false ) {
global $wgDBservers;
if ( is_array( $wgDBservers ) ) {
$servers = $wgDBservers;
foreach ( $servers as $i => &$server ) {
if ( $i == 0 ) {
$server['master'] = true;
} else {
$server['slave'] = true;
}
$server += [ 'flags' => DBO_DEFAULT ];
}
} else {
global $wgDBserver, $wgDBuser, $wgDBpassword, $wgDBname, $wgDBtype, $wgDebugDumpSql;
global $wgDBssl, $wgDBcompress;
$flags = DBO_DEFAULT;
if ( $wgDebugDumpSql ) {
$flags |= DBO_DEBUG;
}
if ( $wgDBssl ) {
$flags |= DBO_SSL;
}
if ( $wgDBcompress ) {
$flags |= DBO_COMPRESS;
}
$servers = [ [
'host' => $wgDBserver,
'user' => $wgDBuser,
'password' => $wgDBpassword,
'dbname' => $wgDBname,
'type' => $wgDBtype,
'load' => 1,
'flags' => $flags,
'master' => true
] ];
}
return $this->newLoadBalancer( $servers );
}
/**
* @param bool|string $wiki
* @return LoadBalancer
*/
public function getMainLB( $wiki = false ) {
if ( !isset( $this->mainLB ) ) {
$this->mainLB = $this->newMainLB( $wiki );
$this->mainLB->parentInfo( [ 'id' => 'main' ] );
$this->chronProt->initLB( $this->mainLB );
}
return $this->mainLB;
}
/**
* @throws MWException
* @param string $cluster
* @param bool|string $wiki
* @return LoadBalancer
*/
protected function newExternalLB( $cluster, $wiki = false ) {
global $wgExternalServers;
if ( !isset( $wgExternalServers[$cluster] ) ) {
throw new MWException( __METHOD__ . ": Unknown cluster \"$cluster\"" );
}
return $this->newLoadBalancer( $wgExternalServers[$cluster] );
}
/**
* @param string $cluster
* @param bool|string $wiki
* @return array
*/
public function &getExternalLB( $cluster, $wiki = false ) {
if ( !isset( $this->extLBs[$cluster] ) ) {
$this->extLBs[$cluster] = $this->newExternalLB( $cluster, $wiki );
$this->extLBs[$cluster]->parentInfo( [ 'id' => "ext-$cluster" ] );
$this->chronProt->initLB( $this->extLBs[$cluster] );
}
return $this->extLBs[$cluster];
}
private function newLoadBalancer( array $servers ) {
$lb = new LoadBalancer( [
'servers' => $servers,
'loadMonitor' => $this->loadMonitorClass,
'readOnlyReason' => $this->readOnlyReason,
'trxProfiler' => $this->trxProfiler,
'srvCache' => $this->srvCache,
'wanCache' => $this->wanCache
] );
$this->initLoadBalancer( $lb );
return $lb;
}
/**
* Execute a function for each tracked load balancer
* The callback is called with the load balancer as the first parameter,
* and $params passed as the subsequent parameters.
*
* @param callable $callback
* @param array $params
*/
public function forEachLB( $callback, array $params = [] ) {
if ( isset( $this->mainLB ) ) {
call_user_func_array( $callback, array_merge( [ $this->mainLB ], $params ) );
}
foreach ( $this->extLBs as $lb ) {
call_user_func_array( $callback, array_merge( [ $lb ], $params ) );
}
}
}
Zerion Mini Shell 1.0