mirror of
https://github.com/LiteyukiStudio/LiteyukiBot.git
synced 2024-12-05 11:35:17 +08:00
99 lines
3.7 KiB
Markdown
99 lines
3.7 KiB
Markdown
---
|
||
title: Process Communication
|
||
order: 4
|
||
---
|
||
|
||
# **Channel Communication**
|
||
|
||
### Introduction
|
||
|
||
LiteyukiBot is running in the main process MainProcess, and other plugin framework processes are child processes that come with it.
|
||
Therefore, it is impossible to communicate through shared memory and direct object transfer.
|
||
Liteyuki provides a channel [`Channel`](./api/comm/channel#class-channel-generic-t) for inter-process communication like `go`.
|
||
You can send messages to other processes through [`Channel`](./api/comm/channel#class-channel-generic-t) and listen to messages from other processes.
|
||
|
||
### Example
|
||
|
||
The channel is full-duplex, with two receiving modes, but only one mode can be used for a channel, that is, passive mode and active mode, passive mode is implemented by the `chan.on_receive()` decorator callback function, and active mode needs to call `chan.receive()` to implement
|
||
|
||
- 创建子进程的同时会初始化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`,
|
||
- 主进程中通过`get_channel`函数获取通道对象
|
||
- 子进程中导入单例`active_channel`及`passive_channel`即可
|
||
|
||
> 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
|
||
|
||
- 相比于普通进程通信,内存共享使得代码编写更加简洁,轻雪框架提供了一个内存共享通信的接口,你可以通过`storage`模块实现内存共享通信,该模块封装通道实现
|
||
- 内存共享是线程安全的,你可以在多个线程中读写共享内存,线程锁会自动保护共享内存的读写操作
|
||
|
||
### 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](https://github.com/LiteyukiStudio/LiteyukiBot/blob/main/liteyuki/comm/storage.py)
|