baseimage-tutorial-framework/tfw/components/frontend/frontend_handler.py

from tfw.internals.networking import Scope

from .message_storage import FrontendMessageStorage


class FrontendHandler:
    # TODO: do not store dashboard messages like reloadFrontend
    keys = [
        'console.read',
        'console.write',
        'console.showLiveLogs',
        'console.rewriteContentWithProcessLogsOnDeploy',
        'dashboard.layout',
        'dashboard.hideMessages',
        'dashboard.terminalMenuItem',
        'dashboard.reloadFrontend',
        'dashboard.reloadIframe',
        'message.config',
        'message.queue',
        'message.send'
    ]

    def __init__(self):
        self.connector = None
        self.keys = [*type(self).keys, 'recover']
        self._frontend_message_storage = FrontendMessageStorage(type(self).keys)

    def send_message(self, message):
        self.connector.send_message(message, scope=Scope.WEBSOCKET)

    def handle_event(self, message, _):
        self._frontend_message_storage.save_message(message)
        if message['key'] == 'recover':
            self.recover_frontend()
        self.send_message(message)

    def recover_frontend(self):
        for message in self._frontend_message_storage.messages:
            self.send_message(message)