MongoClient::connectToReplSetPrimary PHP Метод

    private function connectToReplSetPrimary()
    {
        if ($this->primaryProtocol) {
            return $this->primaryProtocol;
        }
        // Replace the seed host list with the correct host list from the replSet itself
        // TODO: Chicken/egg problem. We should really be getting this list *from* the PRIMARY.
        //       The MongoDB driver specification docs suggest, perhaps, doing a second query
        //       to make sure the PRIMARY believes it is the PRIMARY and to verify the host
        //       list, but I'm not sure if we should spend the IO time on that second call.
        $this->hosts = $this->retrieveReplSetHosts();
        foreach ($this->hosts as $host_info) {
            if (isset($host_info['state']) && $host_info['state'] === static::STATE_PRIMARY) {
                $this->primaryProtocol = $this->connectToHost($host_info['host'], $host_info['port']);
                return $this->primaryProtocol;
            }
        }
        throw new \MongoException("Could not determine PRIMARY member from replSet host list.");
    }