baseimage-tutorial-framework/lib/tfw/components/terminado_event_handler.py

# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
# All Rights Reserved. See LICENSE file for details.

from tfw.components.terminado_mini_server import TerminadoMiniServer
from tfw.event_handler_base import TriggerlessEventHandler
from tfw.config import TFWENV
from tfw.config.logs import logging

LOG = logging.getLogger(__name__)


class TerminadoEventHandler(TriggerlessEventHandler):
    def __init__(self, key, monitor):
        super().__init__(key)
        self.working_directory = TFWENV.TERMINADO_DIR
        self._historymonitor = monitor
        self.terminado_server = TerminadoMiniServer('/terminal', TFWENV.TERMINADO_PORT, TFWENV.TERMINADO_WD, ['bash'])
        self.commands = {'write': self.write,
                         'read': self.read}
        if self._historymonitor:
            self._historymonitor.watch()
        self.terminado_server.listen()

    @property
    def historymonitor(self):
        return self._historymonitor

    def handle_event(self, key, message):
        LOG.debug('TerminadoEventHandler received event: %s', message)
        try:
            message['data'] = self.commands[message['data']['command']](message['data'])
            return message
        except KeyError:
            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)

    def write(self, data):
        self.terminado_server.pty.write(data['shellcmd'])

    def read(self, data):
        data['count'] = int(data.get('count', 1))
        if self.historymonitor:
            data['history'] = self.historymonitor.history[-data['count']:]
        return data

    def cleanup(self):
        if self.historymonitor:
            self.historymonitor.stop()