MongoClient::retrieveReplSetHosts PHP Метод

    protected function retrieveReplSetHosts()
    {
        if (!$this->replSet) {
            throw new MongoConnectionException("Cannot retrieve replication set host list. Connection not configured as a replSet connection.");
        }
        $protocol = $this->connectToFirstAvailableHost();
        $is_master = $this->selectDB('admin')->command(['isMaster' => 1], ['protocol' => $protocol]);
        if (!isset($is_master['setName']) || $is_master['setName'] != $this->replSet) {
            throw new MongoConnectionException("Could not ascertain replSet information from seed host ({$protocol->getServerHash()}). Are you sure this host is configured as a member of replset: '{$this->replSet}'?");
        }
        $hosts = [];
        $replset_hosts = isset($is_master['hosts']) ? $is_master['hosts'] : array();
        $replset_passive_hosts = isset($is_master['passive']) ? $is_master['passive'] : array();
        $all_hosts = array_merge($replset_hosts, $replset_passive_hosts);
        foreach ($all_hosts as $host_str) {
            $host_parts = $this->parseHostString($host_str);
            if ($host_str === $is_master['primary']) {
                $host_parts['state'] = static::STATE_PRIMARY;
            } else {
                $host_parts['state'] = static::STATE_STARTUP;
            }
            $hosts[$host_parts['hash']] = $host_parts;
        }
        return $hosts;
    }