114 lines
4.3 KiB
Python
114 lines
4.3 KiB
Python
import inspect
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import traceback
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import typing as T
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from dataclasses import dataclass
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from astrbot.core.config.astrbot_config import AstrBotConfig
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from astrbot.core.platform.astr_message_event import AstrMessageEvent
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from astrbot.core.star import PluginManager
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from astrbot.api import logger
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from astrbot.core.star.star_handler import star_handlers_registry, EventType
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from astrbot.core.star.star import star_map
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from astrbot.core.message.message_event_result import MessageEventResult, CommandResult
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@dataclass
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class PipelineContext:
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"""上下文对象，包含管道执行所需的上下文信息"""
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astrbot_config: AstrBotConfig # AstrBot 配置对象
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plugin_manager: PluginManager # 插件管理器对象
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async def call_event_hook(
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self,
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event: AstrMessageEvent,
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hook_type: EventType,
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*args,
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) -> bool:
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"""调用事件钩子函数
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Returns:
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bool: 如果事件被终止，返回 True
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"""
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platform_id = event.get_platform_id()
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handlers = star_handlers_registry.get_handlers_by_event_type(
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hook_type, platform_id=platform_id
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)
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for handler in handlers:
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try:
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logger.debug(
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f"hook(on_llm_request) -> {star_map[handler.handler_module_path].name} - {handler.handler_name}"
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)
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await handler.handler(event, *args)
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except BaseException:
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logger.error(traceback.format_exc())
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if event.is_stopped():
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logger.info(
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f"{star_map[handler.handler_module_path].name} - {handler.handler_name} 终止了事件传播。"
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)
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return event.is_stopped()
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async def call_handler(
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self,
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event: AstrMessageEvent,
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handler: T.Awaitable,
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*args,
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**kwargs,
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) -> T.AsyncGenerator[None, None]:
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"""执行事件处理函数并处理其返回结果
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该方法负责调用处理函数并处理不同类型的返回值。它支持两种类型的处理函数:
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1. 异步生成器: 实现洋葱模型，每次 yield 都会将控制权交回上层
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2. 协程: 执行一次并处理返回值
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Args:
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ctx (PipelineContext): 消息管道上下文对象
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event (AstrMessageEvent): 事件对象
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handler (Awaitable): 事件处理函数
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Returns:
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AsyncGenerator[None, None]: 异步生成器，用于在管道中传递控制流
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"""
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ready_to_call = None # 一个协程或者异步生成器
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trace_ = None
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try:
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ready_to_call = handler(event, *args, **kwargs)
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except TypeError as _:
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# 向下兼容
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trace_ = traceback.format_exc()
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# 以前的 handler 会额外传入一个参数, 但是 context 对象实际上在插件实例中有一份
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ready_to_call = handler(event, self.plugin_manager.context, *args, **kwargs)
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if inspect.isasyncgen(ready_to_call):
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_has_yielded = False
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try:
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async for ret in ready_to_call:
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# 这里逐步执行异步生成器, 对于每个 yield 返回的 ret, 执行下面的代码
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# 返回值只能是 MessageEventResult 或者 None（无返回值）
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_has_yielded = True
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if isinstance(ret, (MessageEventResult, CommandResult)):
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# 如果返回值是 MessageEventResult, 设置结果并继续
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event.set_result(ret)
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yield
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else:
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# 如果返回值是 None, 则不设置结果并继续
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# 继续执行后续阶段
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yield ret
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if not _has_yielded:
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# 如果这个异步生成器没有执行到 yield 分支
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yield
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except Exception as e:
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logger.error(f"Previous Error: {trace_}")
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raise e
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elif inspect.iscoroutine(ready_to_call):
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# 如果只是一个协程, 直接执行
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ret = await ready_to_call
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if isinstance(ret, (MessageEventResult, CommandResult)):
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event.set_result(ret)
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yield
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else:
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yield ret
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