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CNDatabase.php
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CNDatabase.php
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<?php
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IDatabase;
/**
* Fetches the CentralNotice infrastructure database.
*/
class CNDatabase {
/** @var bool */
private static $primaryUsedBefore = false;
/**
* Get a DB handle.
*
* If $target is not set, we use DB_PRIMARY if the current context is an HTTP
* POST request, or if DB_PRIMARY was used previously.
*
* We will either connect to the primary database, or a separate
* CentralNotice infrastructure DB specified by $wgCentralDBname. This is
* metawiki for WMF sister projects. Note that the infrastructure DB does
* not support table prefixes if running in multi-database mode.
*
* @param int|null $target Set to DB_PRIMARY or DB_REPLICA to force a connection
* to that database. If no parameter is given, we attempt to choose a
* sane default (see above).
*
* @return IDatabase
*/
public static function getDb( $target = null ) {
global $wgCentralDBname, $wgDBname, $wgRequest;
// If target is null, and the request was POSTed, force DB_PRIMARY.
// This is because changes are normally expected to come through
// Special:CentralNotice form submissions.
// Also, if DB_PRIMARY was used before, use DB_PRIMARY.
// This might help in the case of read-for-write updates, if DB_PRIMARY
// was used previously in an execution that didn't come through a POST.
// XXX: global state usage :(
// XXX: lack of separation of concerns
// XXX: preventive hack for meandering code
if ( ( $target === null ) &&
( $wgRequest->wasPosted() || self::$primaryUsedBefore )
) {
$target = DB_PRIMARY;
}
// If target is still null, use DB_REPLICA.
if ( $target === null ) {
$target = DB_REPLICA;
}
// If we got DB_PRIMARY for whatever reason, make sure that's remembered
if ( $target === DB_PRIMARY ) {
self::$primaryUsedBefore = true;
}
// Always use the database with CentralNotice data
if ( $wgCentralDBname === false || $wgCentralDBname === $wgDBname ) {
return MediaWikiServices::getInstance()
->getDBLoadBalancer()
->getConnection( $target );
} else {
return MediaWikiServices::getInstance()
->getDBLoadBalancerFactory()
->getMainLB( $wgCentralDBname )
->getConnection( $target, [], $wgCentralDBname );
}
}
}

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CNDatabase.php (2 KB)

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