解决Python异步应用中的同步阻塞问题：以Discord与VK消息转发为例

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

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

# Discord事件监听和命令定义
@client.event
async def on_ready():
    print('The bot is connected to Discord!')

@client.event
async def on_message(message):
    if message.author == client.user:  
        return
    # 确保Discord命令能够被处理
    await client.process_commands(message)

@client.command(pass_context=True)
async def hi(ctx: commands.Context):
    await ctx.send('Hi!')

# VK API配置（请替换为实际值）
# login = 'your_vk_login'
# password = 'your_vk_password'
# api_version = '5.131' # 示例API版本
# chat_id = 123456789 # 示例聊天ID
# vk_app_token = 'your_vk_app_token' # vkreal通常使用token认证

# 初始化vkreal会话
# 注意：vkreal的初始化方式可能与vk_api不同，通常直接使用access_token
# 建议查阅vkreal文档获取最新的认证方式
# 假设我们有一个VK用户或群组的access_token
vk_access_token = 'YOUR_VK_ACCESS_TOKEN_HERE' # 替换为你的VK access token
session = vkreal.VkApi(token=vk_access_token)
vk = session.api_context() # 获取API上下文
longpoll = vkreal.VkLongPoll(session, loop=asyncio.get_event_loop()) # 将事件循环传递给longpoll

# 异步VK LongPoll监听器
async def longpoll_listener():
    # 确保Discord客户端已准备就绪，以便发送消息
    await client.wait_until_ready()

    # 替换为你的Discord目标频道ID
    discord_channel_id = 123456789012345678 
    discord_channel = client.get_channel(discord_channel_id)

    if not discord_channel:
        print(f"Error: Discord channel with ID {discord_channel_id} not found.")
        return

    # 使用async for来异步迭代VK事件
    async for event in longpoll.listen():
        # 打印事件类型进行调试，vkreal的事件结构可能与vk_api略有不同
        # 建议根据vkreal的文档或实际打印结果调整事件解析逻辑
        print(f"Received VK event: {event['type']}") 

        # 示例：仅处理新的聊天消息
        if event['type'] == vkreal.VkEventType.MESSAGE_NEW and event['from_chat']:
            message_text = event['text']
            user_id = event['user_id']
            chat_id = event['chat_id'] # 假设我们只关心特定VK聊天的消息

            # 过滤特定聊天ID（如果需要）
            # if chat_id != YOUR_TARGET_VK_CHAT_ID:
            #     continue

            try:
                # 获取用户信息，vkreal的API调用方式可能略有不同
                # 假设vkreal的users.get也返回列表
                user_info = await vk.users.get(user_ids=user_id)
                user_name = user_info[0]['first_name'] + ' ' + user_info[0]['last_name']

                # 检查附件（根据vkreal的事件结构调整）
                # vkreal的attachments可能是一个列表，需要进一步解析
                has_attachment = 'attachments' in event and len(event['attachments']) > 0

                discord_message_content = f"{user_name} » {message_text}"
                if has_attachment:
                    discord_message_content += " [Attachment]"

                # 检查@all标记
                if '@all' in message_text:
                    discord_message_content += " @everyone"

                await discord_channel.send(discord_message_content)

            except Exception as e:
                print(f"Error processing VK message or sending to Discord: {e}")

# 主入口函数，启动所有异步任务
async def main():
    async with client:
        # 创建一个异步任务来运行VK LongPoll监听器
        client.loop.create_task(longpoll_listener())
        # 启动Discord客户端
        await client.start('YOUR_DISCORD_BOT_TOKEN_HERE') # 替换为你的Discord Bot Token

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