forked from LiteyukiStudio/LiteyukiBot
76 lines
2.5 KiB
Markdown
76 lines
2.5 KiB
Markdown
---
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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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``` |