wikimedia / mediawiki

		// Avoid account creation races on double submissions

		$cache = \ObjectCache::getLocalClusterInstance();

		$lock = $cache->getScopedLock( $cache->makeGlobalKey( 'account', md5( $username ) ) );

		if ( !$lock ) {

			$this->logger->debug( __METHOD__ . ': Could not acquire account creation lock', [

				'user' => $username,

			] );

			$user->setId( 0 );

			$user->loadFromId();

			return Status::newFatal( 'usernameinprogress' );

		}

		// Denied by providers?

		$providers = $this->getPreAuthenticationProviders() +

		\Profiler::instance()->getTransactionProfiler()->resetExpectations();

		$backoffKey = wfMemcKey( 'AuthManager', 'autocreate-failed', md5( $username ) );

		if ( $cache->get( $backoffKey ) ) {

			$this->logger->debug( __METHOD__ . ': {username} denied by prior creation attempt failures', [

				'username' => $username,

			] );

			$user->setId( 0 );

			$user->loadFromId();

			return Status::newFatal( 'authmanager-autocreate-exception' );

		}

		// Checks passed, create the user...

		$from = isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : 'CLI';