mirror of
https://github.com/nonebot/nonebot2.git
synced 2024-11-24 00:55:07 +08:00
122 lines
3.5 KiB
Python
122 lines
3.5 KiB
Python
from contextlib import AsyncExitStack
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from typing import Union, ClassVar, NoReturn, Optional
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import anyio
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from exceptiongroup import BaseExceptionGroup, catch
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from nonebot.dependencies import Dependent
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from nonebot.exception import SkippedException
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from nonebot.typing import T_State, T_RuleChecker, T_DependencyCache
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from .adapter import Bot, Event
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from .params import Param, BotParam, EventParam, StateParam, DependParam, DefaultParam
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class Rule:
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"""{ref}`nonebot.matcher.Matcher` 规则类。
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当事件传递时，在 {ref}`nonebot.matcher.Matcher` 运行前进行检查。
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参数:
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*checkers: RuleChecker
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用法:
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```python
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Rule(async_function) & sync_function
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# 等价于
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Rule(async_function, sync_function)
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```
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"""
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__slots__ = ("checkers",)
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HANDLER_PARAM_TYPES: ClassVar[list[type[Param]]] = [
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DependParam,
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BotParam,
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EventParam,
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StateParam,
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DefaultParam,
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]
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def __init__(self, *checkers: Union[T_RuleChecker, Dependent[bool]]) -> None:
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self.checkers: set[Dependent[bool]] = {
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(
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checker
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if isinstance(checker, Dependent)
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else Dependent[bool].parse(
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call=checker, allow_types=self.HANDLER_PARAM_TYPES
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)
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)
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for checker in checkers
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}
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"""存储 `RuleChecker`"""
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def __repr__(self) -> str:
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return f"Rule({', '.join(repr(checker) for checker in self.checkers)})"
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async def __call__(
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self,
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bot: Bot,
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event: Event,
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state: T_State,
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stack: Optional[AsyncExitStack] = None,
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dependency_cache: Optional[T_DependencyCache] = None,
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) -> bool:
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"""检查是否符合所有规则
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参数:
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bot: Bot 对象
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event: Event 对象
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state: 当前 State
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stack: 异步上下文栈
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dependency_cache: 依赖缓存
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"""
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if not self.checkers:
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return True
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result = True
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def _handle_skipped_exception(
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exc_group: BaseExceptionGroup[SkippedException],
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) -> None:
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nonlocal result
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result = False
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async def _run_checker(checker: Dependent[bool]) -> None:
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nonlocal result
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# calculate the result first to avoid data racing
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is_passed = await checker(
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bot=bot,
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event=event,
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state=state,
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stack=stack,
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dependency_cache=dependency_cache,
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)
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result &= is_passed
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with catch({SkippedException: _handle_skipped_exception}):
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async with anyio.create_task_group() as tg:
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for checker in self.checkers:
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tg.start_soon(_run_checker, checker)
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return result
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def __and__(self, other: Optional[Union["Rule", T_RuleChecker]]) -> "Rule":
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if other is None:
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return self
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elif isinstance(other, Rule):
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return Rule(*self.checkers, *other.checkers)
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else:
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return Rule(*self.checkers, other)
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def __rand__(self, other: Optional[Union["Rule", T_RuleChecker]]) -> "Rule":
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if other is None:
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return self
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elif isinstance(other, Rule):
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return Rule(*other.checkers, *self.checkers)
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else:
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return Rule(other, *self.checkers)
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def __or__(self, other: object) -> NoReturn:
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raise RuntimeError("Or operation between rules is not allowed.")
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