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📝 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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远野千束 2024-08-12 05:50:12 +08:00
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---
title: 进程通信
icon: exchange-alt
order: 4
category: 开发
---
## 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`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
- 在轻雪插件中
```python
import asyncio
from liteyuki.comm import get_channel, Channel
from liteyuki import get_bot
channel_passive = get_channel("nonebot-passive")
channel_active = get_channel("nonebot-active")
liteyuki_bot = get_bot()
@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)
```
- 在子进程中可以是NoneBot插件中
```python
from nonebot import get_driver
from liteyuki.comm import get_channel
from liteyuki.log import logger
driver = get_driver()
channel_passive = get_channel("nonebot-passive")
channel_active = get_channel("nonebot-active")
@channel_passive.on_receive()
async def on_passive_receive(data):
logger.info(f"Passive receive: {data}")
@driver.on_startup
async def on_startup():
while True:
data = channel_active.receive()
logger.info(f"Active receive: {data}")
```
- 启动后控制台输出
```shell
..-..-.. ..:..:.. [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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category: 开发
---
# 简介
## 简介
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