Python异步编程中同步阻塞问题的解决方案：以Discord与VK机器人为例

# 原始代码片段中的关键阻塞点
for event in longpoll.listen(): # 这是一个同步的、阻塞的循环
    # ... 处理VK事件的代码 ...

import vkreal
import asyncio
import discord
from discord.ext import commands

# 初始化Discord机器人
client = commands.Bot(command_prefix='!', intents=discord.Intents.all())

# Discord机器人事件和命令定义
@client.event
async def on_ready():
    """机器人启动并连接到Discord时触发"""
    print('The bot is connected to Discord!')

@client.event
async def on_message(message):
    """处理Discord消息，确保命令也能被处理"""
    if message.author == client.user:
        return
    await client.process_commands(message) # 确保Discord命令被处理

@client.command(pass_context=True)
async def hi(ctx: commands.Context):
    """一个简单的Discord命令"""
    await ctx.send('Hi!')

# VK API凭证 (请替换为您的实际信息)
# 注意：vkreal通常推荐使用access token而非login/password
vk_token = "YOUR_VK_ACCESS_TOKEN" # 替换为您的VK访问令牌
chat_id = 123456789 # 替换为您的VK聊天ID

# 初始化vkreal会话和longpoll
# 这里的loop参数在现代asyncio版本中通常不是必需的，但为了兼容性可以保留
session = vkreal.VkApi(token=vk_token)
vk = session.api_context()
longpoll = vkreal.VkLongPoll(session) # vkreal的longpoll默认是异步的

async def longpoll_listener():
    """异步监听VK事件并转发到Discord"""
    print("Starting VK longpoll listener...")
    # 使用async for来异步迭代VK事件，不会阻塞事件循环
    async for event in longpoll.listen():
        if event.type == vkreal.VkEventType.MESSAGE_NEW and event.from_chat and event.chat_id == chat_id:
            user_id = event.user_id
            message_text = event.text
            attachments = event.attachments # vkreal的event对象可能与vk_api略有不同，请查阅其文档

            # 获取用户信息
            # 注意：vkreal的API调用也是异步的
            user_info_list = await vk.users.get(user_ids=user_id)
            user_info = user_info_list[0]
            user_name = f"{user_info['first_name']} {user_info['last_name']}"

            # 确保Discord客户端已准备好
            await client.wait_until_ready()

            # 替换为您的Discord频道ID
            discord_channel_id = YOUR_DISCORD_CHANNEL_ID 
            channel = client.get_channel(discord_channel_id)

            if channel:
                # 构建要发送到Discord的消息
                display_message = f"{user_name} » {message_text}"
                if attachments: # 检查是否有附件
                    # 根据vkreal的附件结构调整判断逻辑
                    display_message += " [Attachment]"

                if '@all' in message_text:
                    await channel.send(f"{display_message} @everyone")
                else:
                    await channel.send(display_message)
            else:
                print(f"Error: Discord channel with ID {discord_channel_id} not found.")
        else:
            # 打印其他类型的事件，以便调试
            print(f"Received VK event type: {event.type}")

async def main():
    """主函数，同时启动Discord机器人和VK监听器"""
    async with client:
        # 将VK监听器作为单独的任务添加到事件循环
        client.loop.create_task(longpoll_listener())
        # 启动Discord机器人，它将运行在同一个事件循环中
        await client.start('YOUR_DISCORD_BOT_TOKEN') # 替换为您的Discord机器人令牌

if __name__ == '__main__':
    # 运行主异步函数
    asyncio.run(main())