def master_departed(interface='master'):
    if is_leader():
        reset_password = True
        new_slave_addresses = []
        old_slave_addresses = list_replication_users()
        for rid in relation_ids(interface):
            if related_units(rid):
                reset_password = False
            for unit in related_units(rid):
                if not relation_get(
                        attribute='slave_address', rid=rid, unit=unit):
                    log("No relation data for {}".format(unit), level=DEBUG)
                    return
                new_slave_addresses.append(
                    relation_get(attribute='slave_address', rid=rid,
                                 unit=unit))
        for old_slave_address in old_slave_addresses:
            if old_slave_address not in new_slave_addresses:
                delete_replication_user(old_slave_address)
        if reset_password:
            leader_set({'async-rep-password': ''})
def master_departed(interface='master'):
    if is_leader():
        reset_password = True
        new_slave_addresses = []
        old_slave_addresses = list_replication_users()
        for rid in relation_ids(interface):
            if related_units(rid):
                reset_password = False
            for unit in related_units(rid):
                if not relation_get(attribute='slave_address',
                                    rid=rid, unit=unit):
                    log("No relation data for {}".format(unit), level=DEBUG)
                    return
                new_slave_addresses.append(
                    relation_get(attribute='slave_address',
                                 rid=rid,
                                 unit=unit))
        for old_slave_address in old_slave_addresses:
            if old_slave_address not in new_slave_addresses:
                delete_replication_user(old_slave_address)
        if reset_password:
            leader_set({'async-rep-password': ''})