forked from bot/app
📝 添加轻雪插件编写简易文档和轻雪进程通信说明
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docs/dev/dev_comm.md
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docs/dev/dev_comm.md
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---
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title: 进程通信
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icon: exchange-alt
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order: 4
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category: 开发
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---
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## 简介
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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。
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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。
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## 快速开始
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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
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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`和`{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
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- 在轻雪插件中
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```python
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import asyncio
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from liteyuki.comm import get_channel, Channel
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from liteyuki import get_bot
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channel_passive = get_channel("nonebot-passive")
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channel_active = get_channel("nonebot-active")
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liteyuki_bot = get_bot()
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@liteyuki_bot.on_after_start
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async def do_something_after_start():
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while True:
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channel_passive.send("I am liteyuki main process passive")
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await asyncio.sleep(0.1)
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channel_active.send("I am liteyuki main process active")
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await asyncio.sleep(3)
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```
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- 在子进程中(可以是NoneBot插件中)
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```python
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from nonebot import get_driver
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from liteyuki.comm import get_channel
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from liteyuki.log import logger
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driver = get_driver()
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channel_passive = get_channel("nonebot-passive")
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channel_active = get_channel("nonebot-active")
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@channel_passive.on_receive()
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async def on_passive_receive(data):
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logger.info(f"Passive receive: {data}")
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@driver.on_startup
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async def on_startup():
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while True:
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data = channel_active.receive()
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logger.info(f"Active receive: {data}")
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```
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- 启动后控制台输出
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```shell
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..-..-.. ..:..:.. [ℹ️信息] Passive receive: I am liteyuki main process passive
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..-..-.. ..:..:.. [ℹ️信息] Active receive: I am liteyuki main process active
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..-..-.. ..:..:.. [ℹ️信息] Passive receive: I am liteyuki main process passive
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..-..-.. ..:..:.. [ℹ️信息] Active receive: I am liteyuki main process active
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...
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```
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category: 开发
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---
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# 简介
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## 简介
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轻雪插件是轻雪内置的一部分功能,运行在主进程中,可以很高程度地扩展轻雪的功能
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