#!/usr/bin/python

class FilterModule(object):
    '''Various utilities for manipulating NetBox data'''
    def filters(self):
        return {
            'device_address': self.device_address
        }

    def device_address(self, device):
        '''Return loopback IP addresses for an L3 attached device'''
        for iface in device['interfaces']:
            for addr in iface['ip_addresses']:
                if addr.get('role') and addr['role'].get('value') == 'loopback':
                    yield addr