baseimage-tutorial-framework/tfw/internals/event_handling/fsm_aware.py

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2019-06-10 13:32:45 +00:00
import logging
from tfw.internals.crypto import KeyManager, verify_message
LOG = logging.getLogger(__name__)
class FSMAware:
keys = ['fsm_update']
"""
Base class for stuff that has to be aware of the framework FSM.
This is done by processing 'fsm_update' messages.
"""
def __init__(self):
self.fsm_state = None
self.fsm_in_accepted_state = False
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self.fsm_event_log = []
self._auth_key = KeyManager().auth_key
def process_message(self, message):
if message['key'] == 'fsm_update':
if verify_message(self._auth_key, message):
self._handle_fsm_update(message)
def _handle_fsm_update(self, message):
try:
new_state = message['current_state']
if self.fsm_state != new_state:
self.handle_fsm_step(message)
self.fsm_state = new_state
self.fsm_in_accepted_state = message['in_accepted_state']
self.fsm_event_log.append(message)
except KeyError:
LOG.error('Invalid fsm_update message received!')
def handle_fsm_step(self, message):
pass