def process_workflow_event(cls, workflow_state, task_state, wf_ex_event):
# Check if event is valid.
if wf_ex_event.name not in events.WORKFLOW_EXECUTION_EVENTS:
raise exc.InvalidEvent(wf_ex_event.name)
# Append additional task context to the event.
event_name = cls.add_context_to_workflow_event(
workflow_state,
task_state['id'],
task_state['route'],
wf_ex_event
)
# Identify current task status.
current_task_status = task_state.get('status', statuses.UNSET)
if current_task_status is None:
current_task_status = statuses.UNSET
if current_task_status not in statuses.ALL_STATUSES:
raise exc.InvalidStatus(current_task_status)
if current_task_status not in TASK_STATE_MACHINE_DATA:
raise exc.InvalidTaskStatusTransition(current_task_status, event_name)
# If no transition is identified, then there is no status change.
if event_name not in TASK_STATE_MACHINE_DATA[current_task_status]:
return
new_task_status = TASK_STATE_MACHINE_DATA[current_task_status][event_name]
# Assign new status to the task flow entry.
task_state['status'] = new_task_status
def process_task_item_event(cls, workflow_state, task_state, ac_ex_event):
# Check if event is valid.
if ac_ex_event.name not in events.ACTION_EXECUTION_EVENTS + events.ENGINE_OPERATION_EVENTS:
raise exc.InvalidEvent(ac_ex_event.name)
# Append additional task context to the event.
event_name = cls.add_context_to_task_item_event(
workflow_state, task_state["id"], task_state["route"], ac_ex_event
)
# Identify current task status.
current_task_status = task_state.get("status", statuses.UNSET)
if current_task_status is None:
current_task_status = statuses.UNSET
if current_task_status not in statuses.ALL_STATUSES:
raise exc.InvalidStatus(current_task_status)
if current_task_status not in TASK_STATE_MACHINE_DATA:
raise exc.InvalidTaskStatusTransition(current_task_status, event_name)
# If no transition is identified, then there is no status change.
if event_name not in TASK_STATE_MACHINE_DATA[current_task_status]:
return
new_task_status = TASK_STATE_MACHINE_DATA[current_task_status][event_name]
# Assign new status to the task flow entry.
task_state["status"] = new_task_status