baseimage-tutorial-framework/tfw/components/frontend/message_storage.py
2019-07-24 15:50:41 +02:00

45 lines
1.1 KiB
Python

from abc import ABC, abstractmethod
from contextlib import suppress
from .message_sender import MessageSender
class MessageStorage(ABC):
def __init__(self):
self._messages = []
def save_message(self, message):
with suppress(KeyError, AttributeError):
if self._filter_message(message):
self._messages.extend(self._transform_message(message))
@abstractmethod
def _filter_message(self, message):
raise NotImplementedError
def _transform_message(self, message): # pylint: disable=no-self-use
yield message
def clear(self):
self._messages.clear()
@property
def messages(self):
yield from self._messages
class FrontendMessageStorage(MessageStorage):
def __init__(self, keys):
self._keys = keys
super().__init__()
def _filter_message(self, message):
key = message['key']
return key in self._keys
def _transform_message(self, message):
if message['key'] == 'queueMessages':
yield from MessageSender.generate_messages_from_queue(message)
else:
yield message