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通道通信 ​

简介 ​

轻雪运行在主进程 MainProcess 里，有部分实现插件为了一些功能在子进程中运行，这样两个进程上下文是不会互相干扰的，因此无法通过共享内存和直接对象传递进行通信。

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。

示例 ​

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

在轻雪插件中(主进程中)

python
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
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 send_data():
    while True:
        channel_passive.send("I am liteyuki main process passive")
        channel_active.send("I am liteyuki main process active")
        await asyncio.sleep(3)  # 每3秒发送一次消息

在子进程中（例如NoneBot插件中）

python
from nonebot import get_driver
from liteyuki.comm import active_channel, passive_channel  # 子进程中获取通道直接导入进程全局单例即可
from liteyuki.log import logger

driver = get_driver()


# 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
@passive_channel.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
def on_startup():
    while True:
        data = active_channel.receive()
        logger.info(f"Active receive: {data}")

启动后控制台输出

log
0000-00-00 00:00:00 [ℹ️信息] Passive receive: I am liteyuki main process passive
0000-00-00 00:00:00 [ℹ️信息] Active receive: I am liteyuki main process active
0000-00-00 00:00:03 [ℹ️信息] Passive receive: I am liteyuki main process passive
0000-00-00 00:00:03 [ℹ️信息] Active receive: I am liteyuki main process active
...

共享内存通信 ​

简介 ​

示例 ​

在任意进程中均可使用

python
from liteyuki.comm.storage import shared_memory

shared_memory.set("key", "value")  # 设置共享内存
value = shared_memory.get("key")  # 获取共享内存

源代码：liteyuki/comm/storage.py

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