mirror of
https://github.com/nonebot/nonebot2.git
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127 lines
4.0 KiB
Python
127 lines
4.0 KiB
Python
"""
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事件处理函数
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============
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该模块实现事件处理函数的封装，以实现动态参数等功能。
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"""
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import asyncio
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from contextlib import AsyncExitStack
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from typing import Any, Dict, List, Type, Callable, Optional
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from nonebot.utils import get_name, run_sync
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from nonebot.dependencies import (
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Param,
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Dependent,
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DependsWrapper,
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get_dependent,
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solve_dependencies,
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get_parameterless_sub_dependant,
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)
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class Handler:
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"""事件处理器类。支持依赖注入。"""
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def __init__(
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self,
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func: Callable[..., Any],
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*,
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name: Optional[str] = None,
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dependencies: Optional[List[DependsWrapper]] = None,
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allow_types: Optional[List[Type[Param]]] = None,
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):
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"""
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:说明:
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装饰一个函数为事件处理器。
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:参数:
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* ``func: Callable[..., Any]``: 事件处理函数。
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* ``name: Optional[str]``: 事件处理器名称。默认为函数名。
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* ``dependencies: Optional[List[DependsWrapper]]``: 额外的非参数依赖注入。
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* ``allow_types: Optional[List[Type[Param]]]``: 允许的参数类型。
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"""
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self.func = func
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"""
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:类型: ``Callable[..., Any]``
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:说明: 事件处理函数
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"""
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self.name = get_name(func) if name is None else name
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"""
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:类型: ``str``
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:说明: 事件处理函数名
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"""
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self.allow_types = allow_types or []
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"""
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:类型: ``List[Type[Param]]``
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:说明: 事件处理器允许的参数类型
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"""
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self.dependencies = dependencies or []
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"""
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:类型: ``List[DependsWrapper]``
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:说明: 事件处理器的额外依赖
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"""
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self.sub_dependents: Dict[Callable[..., Any], Dependent] = {}
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if dependencies:
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for depends in dependencies:
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self.cache_dependent(depends)
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self.dependent = get_dependent(func=func, allow_types=self.allow_types)
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def __repr__(self) -> str:
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return f"<Handler {self.name}({', '.join(map(str, self.dependent.params))})>"
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def __str__(self) -> str:
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return repr(self)
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async def __call__(
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self,
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*,
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_stack: Optional[AsyncExitStack] = None,
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_dependency_cache: Optional[Dict[Callable[..., Any], Any]] = None,
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**params,
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) -> Any:
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values, _ = await solve_dependencies(
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_dependent=self.dependent,
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_stack=_stack,
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_sub_dependents=[
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self.sub_dependents[dependency.dependency] # type: ignore
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for dependency in self.dependencies
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],
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_dependency_cache=_dependency_cache,
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**params,
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)
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if asyncio.iscoroutinefunction(self.func):
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return await self.func(**values)
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else:
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return await run_sync(self.func)(**values)
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def cache_dependent(self, dependency: DependsWrapper):
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if not dependency.dependency:
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raise ValueError(f"{dependency} has no dependency")
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if dependency.dependency in self.sub_dependents:
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raise ValueError(f"{dependency} is already in dependencies")
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sub_dependant = get_parameterless_sub_dependant(
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depends=dependency, allow_types=self.allow_types
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)
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self.sub_dependents[dependency.dependency] = sub_dependant
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def prepend_dependency(self, dependency: DependsWrapper):
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self.cache_dependent(dependency)
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self.dependencies.insert(0, dependency)
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def append_dependency(self, dependency: DependsWrapper):
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self.cache_dependent(dependency)
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self.dependencies.append(dependency)
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def remove_dependency(self, dependency: DependsWrapper):
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if not dependency.dependency:
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raise ValueError(f"{dependency} has no dependency")
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if dependency.dependency in self.sub_dependents:
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del self.sub_dependents[dependency.dependency]
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if dependency in self.dependencies:
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self.dependencies.remove(dependency)
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