actions.py

#!/usr/bin/env python3
import sys
sys.path.append('lib')

from charms.reactive import main
from charms.reactive import set_state
from charmhelpers.core.hookenv import action_fail

"""
`set_state` only works here because it's flushed to disk inside the `main()`
loop. remove_state will need to be called inside the action method.
"""
set_state('vpe.add-corporation')

try:
    main()
except Exception as e:
    action_fail(repr(e))

reactive.py

@when('vpe.add-corporation')
def add_corporation():
    '''
    Create and Activate the network corporation
    '''
    domain_name = action_get('domain-name')
    iface_name = action_get('iface-name')
    # HACK: python's list, used deeper, throws an exception on ints in a tuple
    vlan_id = str(action_get('vlan-id'))
    cidr = action_get('cidr')
    area = action_get('area')
    subnet_cidr = action_get('subnet-cidr')
    subnet_area = action_get('subnet-area')

    iface_vlanid = '%s.%s' % (iface_name, vlan_id)

    status_set('maintenance', 'adding corporation {}'.format(domain_name))
    try:
        # stuff
    except subprocess.CalledProcessError as e:
        delete_corporation()
        action_fail('Command failed: %s (%s)' %
                    (' '.join(e.cmd), str(e.output)))
    finally:
        remove_state('vpe.add-corporation')
        status_set('active', 'ready!')