组件：事件监听器

➜  HelloPlugin > lbp comp EventListener
Generating component EventListener...
Component EventListener generated successfully.
组件 EventListener 生成成功。

➜  HelloPlugin > tree
...
├── components
│   ├── __init__.py
│   └── event_listener
│       ├── __init__.py
│       ├── default.py
│       └── default.yaml
...

# Auto generated by LangBot Plugin SDK.
# Please refer to https://docs.langbot.app/en/plugin/dev/tutor.html for more details.
from __future__ import annotations

from langbot_plugin.api.definition.components.common.event_listener import EventListener
from langbot_plugin.api.entities import events, context


class DefaultEventListener(EventListener):

    async def initialize(self):
        await super().initialize()

        "Fill with your code here"

...
class DefaultEventListener(EventListener):

    async def initialize(self):
        await super().initialize()
        
        @self.handler(events.PersonMessageReceived)
        async def handler(event_context: context.EventContext):
            print("Hello LangBot Plugin!")
            print(event_context)
            
            await event_context.reply(
                platform_message.MessageChain([
                    platform_message.Plain(text=f"Hello from Nahida Plugin!"),
                ])
            )

# EventContext 的定义摘要
class EventContext(pydantic.BaseModel):
    """事件上下文, 保存此次事件运行的信息"""
    ...

    event: pydantic.SerializeAsAny[BaseEventModel]
    """此次事件的对象，具体类型为handler注册时指定监听的类型，可查看events.py中的定义"""
    
    ...