C-Python asyncio：在线程中运行 discord.py

Question

我必须在单独的线程中启动 discord.py，因为我无法阻止我的主线程。
是游戏服务器C/Python 3.7 (ubuntu 18)

C 代码：

int pysDiscord_Init;
...
PyObject *psv_discord;

psv_discord = Python_LoadModule("sv_discord");
if (psv_discord != NULL) {
  pysDiscord_Init = Python_RegisterFunction(psv_discord, "sv_discord", "init");
  Python_Execute(pysDiscord_Init, "");
}

sv_discord.py

import discord
import asyncio
import threading
from concurrent.futures import ThreadPoolExecutor
import multiprocessing

TOKEN = '12345'

client = discord.Client()

def init():
    print("Initializing Discord...")
    print("current_thread: %s" % threading.current_thread())
    t = threading.Thread(target=client.run, args=(TOKEN,))
    t.start()

or

def init():
    print("Initializing Discord...")
    print("current_thread: %s" % threading.current_thread())
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    asyncio.get_child_watcher().attach_loop(loop)
    pool = ThreadPoolExecutor(max_workers=multiprocessing.cpu_count())
    task = loop.run_in_executor(pool, client.run, TOKEN)
    loop.run_until_complete(task)

set_wakeup_fd 异常：

...
Initializing Discord...
current_thread: <_MainThread(MainThread, started 4150019840)>

Exception in thread Thread-1:
 Traceback (most recent call last):
 File "./build/Lib/asyncio/unix_events.py", line 92, in add_signal_handler
 ValueError: set_wakeup_fd only works in main thread

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
 File "./build/Lib/threading.py", line 917, in _bootstrap_inner
 File "./build/Lib/threading.py", line 865, in run
 File "./../source/discord.py-rewrite/discord/client.py", line 550, in run
 File "./build/Lib/asyncio/unix_events.py", line 94, in add_signal_handler
RuntimeError: set_wakeup_fd only works in main thread

我应该提到，我在 python 上尝试了相同的代码（没有 C 代码）并且它可以工作。
此错误告诉我有关主线程的信息。但是我没有在新线程中创建sv_discord，从日志中可以看出，它是init()方法中的"Main"线程。我不明白这个。

Answer 1

回答我自己的问题：

我应该感谢这个来源 asyncio-you-are-a-complex-beast 我终于找到了解决方案。
最终的工作代码如下所示：

import discord
import asyncio
from threading import Thread


client = discord.Client()


def init():
    loop = asyncio.get_event_loop()
    loop.create_task(client.start(TOKEN))
    Thread(target=loop.run_forever).start()


@client.event
async def on_message(message):
    if message.author == client.user:
        return

    print("on_message content: %s, channel: %s" % (message.content, message.channel))
    await message.channel.send('Hello!')


@client.event
    async def on_ready():
    print("Discord bot logged in as: %s, %s" % (client.user.name, client.user.id))

我的主要错误是，我在系统内部通过 pip 编译并使用了最新的rewrite 版本的游戏，我得到了0.16.12 并阅读了documentation for 0.16.12，而我不得不查看discord.py.rewrite（对于on_message 里面的例子我用错了client.send_message 而我不得不用message.channel.send)

Answer 2

我有一个类似的边缘情况（不是 asyncio 的真正预期用途，而是什么鬼）我需要线程 discord.py 实例。

我最终使用以下内容修改了您的解决方案：

class discordHost(discord.Client):
    async def on_ready(self):
        print(f'{DThread.discord_client.user} has connected.')

class Threader(Thread):
    def __init__(self):
        Thread.__init__(self)
        self.loop = asyncio.get_event_loop()
        self.start()

    async def starter(self):
        self.discord_client = discordHost()
        await self.discord_client.start(DISCORD_TOKEN)

    def run(self):
        self.name = 'Discord.py'

        self.loop.create_task(self.starter())
        self.loop.run_forever()

if not 'Discord.py' in [t.name for t in tenumerate()]:
    DThread = Threader()

这或多或少做同样的事情，但我已将Thread 和discord.Client 子类化，以便更轻松地处理两者的结果。

这里唯一需要注意的是，asyncio.get_event_loop() 必须在 Thread.start() 之前调用，否则它会混淆并丢失它的主线程上下文。