MediaWiki REL1_33
getReplicaServer.php
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1<?php
24require_once __DIR__ . '/Maintenance.php';
25
26use MediaWiki\MediaWikiServices;
27
33class GetReplicaServer extends Maintenance {
34 public function __construct() {
35 parent::__construct();
36 $this->addOption( "group", "Query group to check specifically" );
37 $this->addDescription( 'Report the hostname of a replica DB server' );
38 }
39
40 public function execute() {
41 global $wgAllDBsAreLocalhost;
42 if ( $wgAllDBsAreLocalhost ) {
43 $host = 'localhost';
44 } elseif ( $this->hasOption( 'group' ) ) {
45 $db = $this->getDB( DB_REPLICA, $this->getOption( 'group' ) );
46 $host = $db->getServer();
47 } else {
48 $lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
49 $i = $lb->getReaderIndex();
50 $host = $lb->getServerName( $i );
51 }
52 $this->output( "$host\n" );
53 }
54}
55
56$maintClass = GetReplicaServer::class;
57require_once RUN_MAINTENANCE_IF_MAIN;
use
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
Definition APACHE-LICENSE-2.0.txt:10
GetReplicaServer
Maintenance script that reports the hostname of a replica DB server.
Definition getReplicaServer.php:33
GetReplicaServer\execute
execute()
Do the actual work.
Definition getReplicaServer.php:40
GetReplicaServer\__construct
__construct()
Default constructor.
Definition getReplicaServer.php:34
Maintenance
Abstract maintenance class for quickly writing and churning out maintenance scripts with minimal effo...
Definition maintenance.txt:39
Maintenance\output
output( $out, $channel=null)
Throw some output to the user.
Definition Maintenance.php:434
Maintenance\getDB
getDB( $db, $groups=[], $wiki=false)
Returns a database to be used by current maintenance script.
Definition Maintenance.php:1373
Maintenance\hasOption
hasOption( $name)
Checks to see if a particular option exists.
Definition Maintenance.php:269
Maintenance\addDescription
addDescription( $text)
Set the description text.
Definition Maintenance.php:329
Maintenance\addOption
addOption( $name, $description, $required=false, $withArg=false, $shortName=false, $multiOccurrence=false)
Add a parameter to the script.
Definition Maintenance.php:248
Maintenance\getOption
getOption( $name, $default=null)
Get an option, or return the default.
Definition Maintenance.php:283
MediaWiki\MediaWikiServices
MediaWikiServices is the service locator for the application scope of MediaWiki.
Definition MediaWikiServices.php:103
php
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition injection.txt:37
RUN_MAINTENANCE_IF_MAIN
require_once RUN_MAINTENANCE_IF_MAIN
Definition maintenance.txt:50
DB_REPLICA
const DB_REPLICA
Definition defines.php:25