如何打开终端并运行脚本，然后通过 discord bot 关闭它

Question

我正在尝试制作一个不和谐机器人来通过不和谐启动我的我的世界服务器。这就是我目前所拥有的。

import os
import discord
import subprocess

@client.event
async def on_message(message):
    if message.author == client.user:
        return
    if message.content == 'server!start':
        await message.channel.send('Loading ngrok...')
        #run terminal with ngrok
        await message.channel.send('Loading minecraft server...')
        #run terminal with minecraft server
    if message.content == 'server!stop':
        await message.channel.send('Stopping server...')
        #stop minecraft and ngrok by killing terminal

在代码中，我想打开终端并执行 bash 脚本来运行服务器，然后，当需要关闭它时，我想杀死终端或将“停止”发送到控制台。

编辑：我尝试使用 subprocess.Popen，但我无法从另一个 if 语句关闭它，而不是我第一次执行该语句

@client.event
async def on_message(message):
    if message.author == client.user:
        return
    if message.content == 'server!start':
        await message.channel.send('Loading ngrok...')
        ngrok = subprocess.Popen("/home/administrator/minecraft/server/startngrok.sh", shell=True)
        #run terminal with ngrok
        await message.channel.send('Loading minecraft server...')
        minecraft = subprocess.Popen("/home/administrator/minecraft/server/startserver.sh", shell=True)
        #run terminal with minecraft server
    if message.content == 'server!stop':
        await message.channel.send('Stopping server...')
        ngrok.terminate()
        server.terminate()
        #stop minecraft and ngrok by killing terminal
enter code here

这是输出：

Ignoring exception in on_message
Traceback (most recent call last):
  File "/home/administrator/.local/lib/python3.8/site-packages/discord/client.py", line 343, in _run_event
    await coro(*args, **kwargs)
  File "/home/administrator/minecraft/bot/bot.py", line 25, in on_message
    ngrok.terminate()
UnboundLocalError: local variable 'ngrok' referenced before assignment

Answer 1

当前错误：UnboundLocalError: local variable 'ngrok' referenced before assignment 这意味着在调用ngrok.terminate() 之前没有初始化（定义）'ngrok'。发生这种情况是因为您在上面的 if 条件中初始化了您的 ngrok，但是说，如果您从未运行过该条件怎么办？那么ngrok 将永远不会被定义为任何东西。你要做的是先初始化它。

import os
import discord
import subprocess

@client.event
async def on_message(message):
    # define 'ngrok' variable
    ngrok = null
    if message.author == client.user:
        return
    if message.content == 'server!start':
        await message.channel.send('Loading ngrok...')
        ngrok = subprocess.Popen("/home/administrator/minecraft/server/startngrok.sh", shell=True)
        #run terminal with ngrok
        await message.channel.send('Loading minecraft server...')
        minecraft = subprocess.Popen("/home/administrator/minecraft/server/startserver.sh", shell=True)
        #run terminal with minecraft server
    if message.content == 'server!stop':
        await message.channel.send('Stopping server...')
        # If 'ngrok' is a NoneType, catch it
        try:
            ngrok.terminate()
        except AttributeError:
            # exception message or desired except code
        server.terminate()
        #stop minecraft and ngrok by killing terminal

但是，我也没有在任何地方看到服务器定义。可能会出现更多错误。如果您需要更多帮助，请提供sample reproducible code。