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简介

轻雪运行在主进程 MainProcess 里,其他插件框架进程是伴随的子进程,因此无法通过内存共享和直接对象传递的方式进行通信,轻雪提供了一个通道Channel用于跨进程通信,你可以通过Channel发送消息给其他进程,也可以监听其他进程的消息。

例如子进程接收到用户信息需要重启机器人,这时可以通过通道对主进程发送消息,主进程接收到消息后重启对应子进程。

快速开始

通道是全双工的,有两种接收模式,但一个通道只能使用一种,即被动模式和主动模式,被动模式由chan.on_receive()装饰回调函数实现,主动模式需调用chan.receive()实现

轻雪核心在创建子进程的同时会初始化两个通道,一个被动通道和一个主动通道,且通道标识为{process_name}-active{process_name}-passive,你可以通过get_channel函数获取通道对象,然后通过send方法发送消息


import asyncio

from liteyuki.comm import get_channel, Channel
from liteyuki import get_bot
# get_channel函数获取通道对象,参数为调用set_channel时的通道标识
# 每个进程只能获取在当前进程通过set_channel设置的通道
# 轻雪已经在创建进程时把每个通道都传递给了主进程和子进程,以便在哪个进程都可以被获取
channel_passive = get_channel("nonebot-passive")    # 获取被动通道
channel_active = get_channel("nonebot-active")  # 获取主动通道
liteyuki_bot = get_bot()

# 注册一个函数在轻雪启动后运行
@liteyuki_bot.on_after_start
async def do_something_after_start():
    while True:
        channel_passive.send("I am liteyuki main process passive")
        await asyncio.sleep(0.1)
        channel_active.send("I am liteyuki main process active")
        await asyncio.sleep(3)
from nonebot import get_driver
from liteyuki.comm import get_channel
from liteyuki.log import logger

driver = get_driver()

# 通过get_channel函数获取通道对象,参数为调用set_channel时的通道标识
channel_passive = get_channel("nonebot-passive")
channel_active = get_channel("nonebot-active")

# 被动模式,通过装饰器注册一个函数在接收到消息时运行,每次接收到字符串数据时都会运行
@channel_passive.on_receive(filter_func=lambda data: isinstance(data, str))
async def on_passive_receive(data):
    logger.info(f"Passive receive: {data}")

    
# 注册一个函数在NoneBot启动后运行
@driver.on_startup
async def on_startup():
    while True:
        data = channel_active.receive()
        logger.info(f"Active receive: {data}")
..-..-.. ..:..:.. [ℹ️信息] Passive receive: I am liteyuki main process passive
..-..-.. ..:..:.. [ℹ️信息] Active receive: I am liteyuki main process active
..-..-.. ..:..:.. [ℹ️信息] Passive receive: I am liteyuki main process passive
..-..-.. ..:..:.. [ℹ️信息] Active receive: I am liteyuki main process active
...
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