mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-23 01:31:32 +00:00
88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
|
|
# All Rights Reserved. See LICENSE file for details.
|
|
|
|
from tfw import EventHandlerBase
|
|
from tfw.config import TFWENV
|
|
from tfw.config.logs import logging
|
|
from tao.config import TAOENV
|
|
from .terminado_mini_server import TerminadoMiniServer
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class TerminalEventHandler(EventHandlerBase):
|
|
"""
|
|
Event handler responsible for managing terminal sessions for frontend xterm
|
|
sessions to connect to. You need to instanciate this in order for frontend
|
|
terminals to work.
|
|
|
|
This EventHandler accepts messages that have a data['command'] key specifying
|
|
a command to be executed.
|
|
The API of each command is documented in their respective handler.
|
|
"""
|
|
def __init__(self, key, monitor):
|
|
"""
|
|
:param key: key this EventHandler listens to
|
|
:param monitor: tfw.components.HistoryMonitor instance to read command history from
|
|
"""
|
|
super().__init__(key)
|
|
self.working_directory = TFWENV.TERMINADO_DIR
|
|
self._historymonitor = monitor
|
|
bash_as_user_cmd = ['sudo', '-u', TAOENV.USER, 'bash']
|
|
|
|
self.terminado_server = TerminadoMiniServer(
|
|
'/terminal',
|
|
TFWENV.TERMINADO_PORT,
|
|
TFWENV.TERMINADO_WD,
|
|
bash_as_user_cmd
|
|
)
|
|
|
|
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, message):
|
|
LOG.debug('TerminadoEventHandler received event: %s', message)
|
|
try:
|
|
data = message['data']
|
|
message['data'] = self.commands[data['command']](data)
|
|
return message
|
|
except KeyError:
|
|
LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
|
|
|
|
def write(self, data):
|
|
"""
|
|
Writes a string to the terminal session (on the pty level).
|
|
Useful for pre-typing and executing commands for the user.
|
|
|
|
:param data: TFW message data containing 'value'
|
|
(command to be written to the pty)
|
|
"""
|
|
self.terminado_server.pty.write(data['value'])
|
|
|
|
def read(self, data):
|
|
"""
|
|
Reads the history of commands executed.
|
|
|
|
:param data: TFW message data containing 'count'
|
|
(the number of history elements to return)
|
|
:return dict: message with list of commands in data['history']
|
|
"""
|
|
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()
|