<?php
/**
+ * Advanced generator of database load balancing objects for wiki farms.
+ *
+ * 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
*/
*
* masterTemplateOverrides An override array for all master servers.
*
+ * readOnlyBySection A map of section name to read-only message. Missing or false for read/write.
+ *
* @ingroup Database
*/
class LBFactory_Multi extends LBFactory {
// Optional settings
var $groupLoadsBySection = array(), $groupLoadsByDB = array(), $hostsByName = array();
var $externalLoads = array(), $externalTemplateOverrides, $templateOverridesByServer;
- var $templateOverridesByCluster, $masterTemplateOverrides;
+ var $templateOverridesByCluster, $masterTemplateOverrides, $readOnlyBySection = array();
// Other stuff
var $conf, $mainLBs = array(), $extLBs = array();
- var $localSection = null;
+ var $lastWiki, $lastSection;
+ /**
+ * @param $conf array
+ * @throws MWException
+ */
function __construct( $conf ) {
$this->chronProt = new ChronologyProtector;
$this->conf = $conf;
$required = array( 'sectionsByDB', 'sectionLoads', 'serverTemplate' );
$optional = array( 'groupLoadsBySection', 'groupLoadsByDB', 'hostsByName',
'externalLoads', 'externalTemplateOverrides', 'templateOverridesByServer',
- 'templateOverridesByCluster', 'masterTemplateOverrides' );
+ 'templateOverridesByCluster', 'masterTemplateOverrides',
+ 'readOnlyBySection' );
foreach ( $required as $key ) {
if ( !isset( $conf[$key] ) ) {
$this->$key = $conf[$key];
}
}
+
+ // Check for read-only mode
+ $section = $this->getSectionForWiki();
+ if ( !empty( $this->readOnlyBySection[$section] ) ) {
+ global $wgReadOnly;
+ $wgReadOnly = $this->readOnlyBySection[$section];
+ }
}
- function getSectionForWiki( $wiki ) {
- list( $dbName, $prefix ) = $this->getDBNameAndPrefix( $wiki );
+ /**
+ * @param $wiki bool|string
+ * @return string
+ */
+ function getSectionForWiki( $wiki = false ) {
+ if ( $this->lastWiki === $wiki ) {
+ return $this->lastSection;
+ }
+ list( $dbName, ) = $this->getDBNameAndPrefix( $wiki );
if ( isset( $this->sectionsByDB[$dbName] ) ) {
- return $this->sectionsByDB[$dbName];
+ $section = $this->sectionsByDB[$dbName];
} else {
- return 'DEFAULT';
+ $section = 'DEFAULT';
}
+ $this->lastSection = $section;
+ $this->lastWiki = $wiki;
+ return $section;
}
- function getMainLB( $wiki = false ) {
- // Determine section
- if ( $wiki === false ) {
- if ( $this->localSection === null ) {
- $this->localSection = $this->getSectionForWiki( $wiki );
- }
- $section = $this->localSection;
- } else {
- $section = $this->getSectionForWiki( $wiki );
+ /**
+ * @param $wiki bool|string
+ * @return LoadBalancer
+ */
+ function newMainLB( $wiki = false ) {
+ list( $dbName, ) = $this->getDBNameAndPrefix( $wiki );
+ $section = $this->getSectionForWiki( $wiki );
+ $groupLoads = array();
+ if ( isset( $this->groupLoadsByDB[$dbName] ) ) {
+ $groupLoads = $this->groupLoadsByDB[$dbName];
+ }
+ if ( isset( $this->groupLoadsBySection[$section] ) ) {
+ $groupLoads = array_merge_recursive( $groupLoads, $this->groupLoadsBySection[$section] );
}
+ return $this->newLoadBalancer( $this->serverTemplate, $this->sectionLoads[$section], $groupLoads );
+ }
+ /**
+ * @param $wiki bool|string
+ * @return LoadBalancer
+ */
+ function getMainLB( $wiki = false ) {
+ $section = $this->getSectionForWiki( $wiki );
if ( !isset( $this->mainLBs[$section] ) ) {
- list( $dbName, $prefix ) = $this->getDBNameAndPrefix( $wiki );
- $groupLoads = array();
- if ( isset( $this->groupLoadsByDB[$dbName] ) ) {
- $groupLoads = $this->groupLoadsByDB[$dbName];
- }
- if ( isset( $this->groupLoadsBySection[$section] ) ) {
- $groupLoads = array_merge_recursive( $groupLoads, $this->groupLoadsBySection[$section] );
- }
- $this->mainLBs[$section] = $this->newLoadBalancer( $this->serverTemplate,
- $this->sectionLoads[$section], $groupLoads, "main-$section" );
- $this->chronProt->initLB( $this->mainLBs[$section] );
+ $lb = $this->newMainLB( $wiki, $section );
+ $this->chronProt->initLB( $lb );
+ $lb->parentInfo( array( 'id' => "main-$section" ) );
+ $this->mainLBs[$section] = $lb;
}
return $this->mainLBs[$section];
}
+ /**
+ * @param String $cluster
+ * @param bool $wiki
+ * @throws MWException
+ * @return LoadBalancer
+ */
+ function newExternalLB( $cluster, $wiki = false ) {
+ if ( !isset( $this->externalLoads[$cluster] ) ) {
+ throw new MWException( __METHOD__.": Unknown cluster \"$cluster\"" );
+ }
+ $template = $this->serverTemplate;
+ if ( isset( $this->externalTemplateOverrides ) ) {
+ $template = $this->externalTemplateOverrides + $template;
+ }
+ if ( isset( $this->templateOverridesByCluster[$cluster] ) ) {
+ $template = $this->templateOverridesByCluster[$cluster] + $template;
+ }
+ return $this->newLoadBalancer( $template, $this->externalLoads[$cluster], array() );
+ }
+
+ /**
+ * @param $cluster
+ * @param $wiki
+ * @return LoadBalancer
+ */
function &getExternalLB( $cluster, $wiki = false ) {
if ( !isset( $this->extLBs[$cluster] ) ) {
- if ( !isset( $this->externalLoads[$cluster] ) ) {
- throw new MWException( __METHOD__.": Unknown cluster \"$cluster\"" );
- }
- $template = $this->serverTemplate;
- if ( isset( $this->externalTemplateOverrides ) ) {
- $template = $this->externalTemplateOverrides + $template;
- }
- if ( isset( $this->templateOverridesByCluster[$cluster] ) ) {
- $template = $this->templateOverridesByCluster[$cluster] + $template;
- }
- $this->extLBs[$cluster] = $this->newLoadBalancer( $template,
- $this->externalLoads[$cluster], array(), "ext-$cluster" );
+ $this->extLBs[$cluster] = $this->newExternalLB( $cluster, $wiki );
+ $this->extLBs[$cluster]->parentInfo( array( 'id' => "ext-$cluster" ) );
}
return $this->extLBs[$cluster];
}
/**
* Make a new load balancer object based on template and load array
+ *
+ * @param $template
+ * @param $loads array
+ * @param $groupLoads
+ * @return LoadBalancer
*/
- function newLoadBalancer( $template, $loads, $groupLoads, $id ) {
+ function newLoadBalancer( $template, $loads, $groupLoads ) {
global $wgMasterWaitTimeout;
$servers = $this->makeServerArray( $template, $loads, $groupLoads );
- $lb = new LoadBalancer( $servers, false, $wgMasterWaitTimeout );
- $lb->parentInfo( array( 'id' => $id ) );
+ $lb = new LoadBalancer( array(
+ 'servers' => $servers,
+ 'masterWaitTimeout' => $wgMasterWaitTimeout
+ ));
return $lb;
}
/**
* Make a server array as expected by LoadBalancer::__construct, using a template and load array
+ *
+ * @param $template
+ * @param $loads array
+ * @param $groupLoads
+ * @return array
*/
function makeServerArray( $template, $loads, $groupLoads ) {
$servers = array();
/**
* Take a group load array indexed by group then server, and reindex it by server then group
+ * @param $groupLoads
+ * @return array
*/
function reindexGroupLoads( $groupLoads ) {
$reindexed = array();
/**
* Get the database name and prefix based on the wiki ID
+ * @param $wiki bool
+ * @return array
*/
function getDBNameAndPrefix( $wiki = false ) {
if ( $wiki === false ) {
* 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 $callback
+ * @param $params array
*/
function forEachLB( $callback, $params = array() ) {
foreach ( $this->mainLBs as $lb ) {
dépôts / lhc / web / wiklou.git / blobdiff