mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-09 02:17:16 +00:00
65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
from abc import ABC, abstractmethod
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from contextlib import suppress
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from tfw.networking import Scope
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from .message_sender import MessageSender
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from .event_handler import EventHandler
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class FrontendEventHandler(EventHandler):
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def __init__(self):
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frontend_keys = ('message', 'queueMessages', 'dashboard', 'console')
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self._frontend_message_storage = FrontendMessageStorage(frontend_keys)
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super().__init__((*frontend_keys, 'recover'), scope=Scope.WEBSOCKET)
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def handle_event(self, message):
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self._frontend_message_storage.save_message(message)
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if message['key'] == 'recover':
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self.recover_frontend()
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return message
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def recover_frontend(self):
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for message in self._frontend_message_storage.messages:
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self.send_message(message)
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class MessageStorage(ABC):
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def __init__(self):
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self._messages = []
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def save_message(self, message):
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with suppress(KeyError, AttributeError):
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if self._filter_message(message):
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self._messages.extend(self._transform_message(message))
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@abstractmethod
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def _filter_message(self, message):
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raise NotImplementedError
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def _transform_message(self, message): # pylint: disable=no-self-use
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yield message
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def clear(self):
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self._messages.clear()
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@property
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def messages(self):
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yield from self._messages
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class FrontendMessageStorage(MessageStorage):
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def __init__(self, keys):
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self._keys = keys
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super().__init__()
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def _filter_message(self, message):
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key = message['key']
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return key in self._keys
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def _transform_message(self, message):
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if message['key'] == 'queueMessages':
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yield from MessageSender.generate_messages_from_queue(message)
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else:
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yield message
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