defaults = {
    'apt': {
        'packages': {
            'unbound': {},
            'unbound-anchor': {},
        },
    },
    'nameservers': {
        '127.0.0.1',
    },
    'unbound': {
        'max_ttl': 3600,
    },
}


@metadata_reactor
def cpu_cores_to_threads(metadata):
    return {
        'unbound': {
            'threads': metadata.get('vm/cpu', 1)*2,
        },
    }


@metadata_reactor
def iptables(metadata):
    interfaces = metadata.get('unbound/restrict-to-interfaces', set())
    iptables = []

    for iface in sorted(interfaces):
        iptables.append(f'iptables -A INPUT -i {iface} -p tcp --dport 53 -j ACCEPT')
        iptables.append(f'iptables -A INPUT -i {iface} -p udp --dport 53 -j ACCEPT')

    return {
        'iptables': {
            'bundle_rules': {
                'unbound': iptables,
            },
        },
    }