nonebot2/nonebot/matcher.py
2021-11-21 12:36:44 +08:00

713 lines
23 KiB
Python

"""
事件响应器
==========
该模块实现事件响应器的创建与运行,并提供一些快捷方法来帮助用户更好的与机器人进行对话 。
"""
from types import ModuleType
from datetime import datetime
from contextvars import ContextVar
from collections import defaultdict
from contextlib import AsyncExitStack
from typing import (TYPE_CHECKING, Any, Dict, List, Type, Union, Callable,
NoReturn, Optional)
from nonebot.rule import Rule
from nonebot.log import logger
from nonebot.handler import Handler
from nonebot import params, get_driver
from nonebot.dependencies import DependsWrapper
from nonebot.permission import USER, Permission
from nonebot.adapters import (Bot, Event, Message, MessageSegment,
MessageTemplate)
from nonebot.exception import (PausedException, StopPropagation,
SkippedException, FinishedException,
RejectedException)
from nonebot.typing import (T_State, T_Handler, T_ArgsParser, T_TypeUpdater,
T_StateFactory, T_DependencyCache,
T_PermissionUpdater)
if TYPE_CHECKING:
from nonebot.plugin import Plugin
matchers: Dict[int, List[Type["Matcher"]]] = defaultdict(list)
"""
:类型: ``Dict[int, List[Type[Matcher]]]``
:说明: 用于存储当前所有的事件响应器
"""
current_bot: ContextVar[Bot] = ContextVar("current_bot")
current_event: ContextVar[Event] = ContextVar("current_event")
current_state: ContextVar[T_State] = ContextVar("current_state")
class MatcherMeta(type):
if TYPE_CHECKING:
module: Optional[str]
plugin_name: Optional[str]
module_name: Optional[str]
module_prefix: Optional[str]
type: str
rule: Rule
permission: Permission
handlers: List[T_Handler]
priority: int
block: bool
temp: bool
expire_time: Optional[datetime]
def __repr__(self) -> str:
return (f"<Matcher from {self.module_name or 'unknown'}, "
f"type={self.type}, priority={self.priority}, "
f"temp={self.temp}>")
def __str__(self) -> str:
return repr(self)
class Matcher(metaclass=MatcherMeta):
"""事件响应器类"""
plugin: Optional["Plugin"] = None
"""
:类型: ``Optional[Plugin]``
:说明: 事件响应器所在插件
"""
module: Optional[ModuleType] = None
"""
:类型: ``Optional[ModuleType]``
:说明: 事件响应器所在插件模块
"""
plugin_name: Optional[str] = None
"""
:类型: ``Optional[str]``
:说明: 事件响应器所在插件名
"""
module_name: Optional[str] = None
"""
:类型: ``Optional[str]``
:说明: 事件响应器所在点分割插件模块路径
"""
type: str = ""
"""
:类型: ``str``
:说明: 事件响应器类型
"""
rule: Rule = Rule()
"""
:类型: ``Rule``
:说明: 事件响应器匹配规则
"""
permission: Permission = Permission()
"""
:类型: ``Permission``
:说明: 事件响应器触发权限
"""
handlers: List[Handler] = []
"""
:类型: ``List[Handler]``
:说明: 事件响应器拥有的事件处理函数列表
"""
priority: int = 1
"""
:类型: ``int``
:说明: 事件响应器优先级
"""
block: bool = False
"""
:类型: ``bool``
:说明: 事件响应器是否阻止事件传播
"""
temp: bool = False
"""
:类型: ``bool``
:说明: 事件响应器是否为临时
"""
expire_time: Optional[datetime] = None
"""
:类型: ``Optional[datetime]``
:说明: 事件响应器过期时间点
"""
_default_state: T_State = {}
"""
:类型: ``T_State``
:说明: 事件响应器默认状态
"""
_default_state_factory: Optional[T_StateFactory] = None
"""
:类型: ``Optional[T_State]``
:说明: 事件响应器默认工厂函数
"""
_default_parser: Optional[T_ArgsParser] = None
"""
:类型: ``Optional[T_ArgsParser]``
:说明: 事件响应器默认参数解析函数
"""
_default_type_updater: Optional[T_TypeUpdater] = None
"""
:类型: ``Optional[T_TypeUpdater]``
:说明: 事件响应器类型更新函数
"""
_default_permission_updater: Optional[T_PermissionUpdater] = None
"""
:类型: ``Optional[T_PermissionUpdater]``
:说明: 事件响应器权限更新函数
"""
HANDLER_PARAM_TYPES = [
params.BotParam, params.EventParam, params.StateParam,
params.MatcherParam
]
def __init__(self):
"""实例化 Matcher 以便运行"""
self.handlers = self.handlers.copy()
self.state = self._default_state.copy()
def __repr__(self) -> str:
return (
f"<Matcher from {self.module_name or 'unknown'}, type={self.type}, "
f"priority={self.priority}, temp={self.temp}>")
def __str__(self) -> str:
return repr(self)
@classmethod
def new(
cls,
type_: str = "",
rule: Optional[Rule] = None,
permission: Optional[Permission] = None,
handlers: Optional[Union[List[T_Handler], List[Handler],
List[Union[T_Handler, Handler]]]] = None,
temp: bool = False,
priority: int = 1,
block: bool = False,
*,
plugin: Optional["Plugin"] = None,
module: Optional[ModuleType] = None,
expire_time: Optional[datetime] = None,
default_state: Optional[T_State] = None,
default_state_factory: Optional[T_StateFactory] = None,
default_parser: Optional[T_ArgsParser] = None,
default_type_updater: Optional[T_TypeUpdater] = None,
default_permission_updater: Optional[T_PermissionUpdater] = None
) -> Type["Matcher"]:
"""
:说明:
创建一个新的事件响应器,并存储至 `matchers <#matchers>`_
:参数:
* ``type_: str``: 事件响应器类型,与 ``event.get_type()`` 一致时触发,空字符串表示任意
* ``rule: Optional[Rule]``: 匹配规则
* ``permission: Optional[Permission]``: 权限
* ``handlers: Optional[List[T_Handler]]``: 事件处理函数列表
* ``temp: bool``: 是否为临时事件响应器,即触发一次后删除
* ``priority: int``: 响应优先级
* ``block: bool``: 是否阻止事件向更低优先级的响应器传播
* ``plugin: Optional[Plugin]``: 事件响应器所在插件
* ``module: Optional[ModuleType]``: 事件响应器所在模块
* ``default_state: Optional[T_State]``: 默认状态 ``state``
* ``default_state_factory: Optional[T_StateFactory]``: 默认状态 ``state`` 的工厂函数
* ``expire_time: Optional[datetime]``: 事件响应器最终有效时间点,过时即被删除
:返回:
- ``Type[Matcher]``: 新的事件响应器类
"""
NewMatcher = type(
"Matcher", (Matcher,), {
"plugin":
plugin,
"module":
module,
"plugin_name":
plugin and plugin.name,
"module_name":
module and module.__name__,
"type":
type_,
"rule":
rule or Rule(),
"permission":
permission or Permission(),
"handlers": [
handler if isinstance(handler, Handler) else Handler(
handler,
dependency_overrides_provider=get_driver(),
allow_types=cls.HANDLER_PARAM_TYPES)
for handler in handlers
] if handlers else [],
"temp":
temp,
"expire_time":
expire_time,
"priority":
priority,
"block":
block,
"_default_state":
default_state or {},
"_default_state_factory":
staticmethod(default_state_factory)
if default_state_factory else None,
"_default_parser":
default_parser,
"_default_type_updater":
default_type_updater,
"_default_permission_updater":
default_permission_updater
})
matchers[priority].append(NewMatcher)
return NewMatcher
@classmethod
async def check_perm(
cls,
bot: Bot,
event: Event,
stack: Optional[AsyncExitStack] = None,
dependency_cache: Optional[Dict[Callable[..., Any],
Any]] = None) -> bool:
"""
:说明:
检查是否满足触发权限
:参数:
* ``bot: Bot``: Bot 对象
* ``event: Event``: 上报事件
:返回:
- ``bool``: 是否满足权限
"""
event_type = event.get_type()
return (event_type == (cls.type or event_type) and
await cls.permission(bot, event, stack, dependency_cache))
@classmethod
async def check_rule(
cls,
bot: Bot,
event: Event,
state: T_State,
stack: Optional[AsyncExitStack] = None,
dependency_cache: Optional[Dict[Callable[..., Any],
Any]] = None) -> bool:
"""
:说明:
检查是否满足匹配规则
:参数:
* ``bot: Bot``: Bot 对象
* ``event: Event``: 上报事件
* ``state: T_State``: 当前状态
:返回:
- ``bool``: 是否满足匹配规则
"""
event_type = event.get_type()
return (event_type == (cls.type or event_type) and
await cls.rule(bot, event, state, stack, dependency_cache))
@classmethod
def args_parser(cls, func: T_ArgsParser) -> T_ArgsParser:
"""
:说明:
装饰一个函数来更改当前事件响应器的默认参数解析函数
:参数:
* ``func: T_ArgsParser``: 参数解析函数
"""
cls._default_parser = func
return func
@classmethod
def type_updater(cls, func: T_TypeUpdater) -> T_TypeUpdater:
"""
:说明:
装饰一个函数来更改当前事件响应器的默认响应事件类型更新函数
:参数:
* ``func: T_TypeUpdater``: 响应事件类型更新函数
"""
cls._default_type_updater = func
return func
@classmethod
def permission_updater(cls,
func: T_PermissionUpdater) -> T_PermissionUpdater:
"""
:说明:
装饰一个函数来更改当前事件响应器的默认会话权限更新函数
:参数:
* ``func: T_PermissionUpdater``: 会话权限更新函数
"""
cls._default_permission_updater = func
return func
@classmethod
def append_handler(
cls,
handler: T_Handler,
dependencies: Optional[List[DependsWrapper]] = None) -> Handler:
handler_ = Handler(handler,
dependencies=dependencies,
dependency_overrides_provider=get_driver(),
allow_types=cls.HANDLER_PARAM_TYPES)
cls.handlers.append(handler_)
return handler_
@classmethod
def handle(cls) -> Callable[[T_Handler], T_Handler]:
"""
:说明:
装饰一个函数来向事件响应器直接添加一个处理函数
:参数:
* 无
"""
def _decorator(func: T_Handler) -> T_Handler:
cls.append_handler(func)
return func
return _decorator
@classmethod
def receive(cls) -> Callable[[T_Handler], T_Handler]:
"""
:说明:
装饰一个函数来指示 NoneBot 在接收用户新的一条消息后继续运行该函数
:参数:
* 无
"""
async def _receive(state: T_State) -> Union[None, NoReturn]:
if state.get(_receive):
return
state[_receive] = True
raise RejectedException
def _decorator(func: T_Handler) -> T_Handler:
depend = DependsWrapper(_receive)
if cls.handlers and cls.handlers[-1].func is func:
func_handler = cls.handlers[-1]
func_handler.prepend_dependency(depend)
else:
cls.append_handler(
func, dependencies=[depend] if cls.handlers else [])
return func
return _decorator
@classmethod
def got(
cls,
key: str,
prompt: Optional[Union[str, Message, MessageSegment,
MessageTemplate]] = None,
args_parser: Optional[T_ArgsParser] = None
) -> Callable[[T_Handler], T_Handler]:
"""
:说明:
装饰一个函数来指示 NoneBot 当要获取的 ``key`` 不存在时接收用户新的一条消息并经过 ``ArgsParser`` 处理后再运行该函数,如果 ``key`` 已存在则直接继续运行
:参数:
* ``key: str``: 参数名
* ``prompt: Optional[Union[str, Message, MessageSegment, MessageFormatter]]``: 在参数不存在时向用户发送的消息
* ``args_parser: Optional[T_ArgsParser]``: 可选参数解析函数,空则使用默认解析函数
"""
async def _key_getter(bot: Bot, event: Event, state: T_State):
if state.get(f"_{key}_prompted"):
return
state["_current_key"] = key
state[f"_{key}_prompted"] = True
if key not in state:
if prompt is not None:
if isinstance(prompt, MessageTemplate):
_prompt = prompt.format(**state)
else:
_prompt = prompt
await bot.send(event=event, message=_prompt)
raise RejectedException
else:
state[f"_{key}_parsed"] = True
async def _key_parser(bot: Bot, event: Event, state: T_State):
if key in state and state.get(f"_{key}_parsed"):
return
parser = args_parser or cls._default_parser
if parser:
await parser(bot, event, state)
else:
state[key] = str(event.get_message())
state[f"_{key}_parsed"] = True
def _decorator(func: T_Handler) -> T_Handler:
get_depend = DependsWrapper(_key_getter)
parser_depend = DependsWrapper(_key_parser)
if cls.handlers and cls.handlers[-1].func is func:
func_handler = cls.handlers[-1]
func_handler.prepend_dependency(parser_depend)
func_handler.prepend_dependency(get_depend)
else:
cls.append_handler(func,
dependencies=[get_depend, parser_depend])
return func
return _decorator
@classmethod
async def send(cls, message: Union[str, Message, MessageSegment,
MessageTemplate], **kwargs) -> Any:
"""
:说明:
发送一条消息给当前交互用户
:参数:
* ``message: Union[str, Message, MessageSegment]``: 消息内容
* ``**kwargs``: 其他传递给 ``bot.send`` 的参数,请参考对应 adapter 的 bot 对象 api
"""
bot = current_bot.get()
event = current_event.get()
state = current_state.get()
if isinstance(message, MessageTemplate):
_message = message.format(**state)
else:
_message = message
return await bot.send(event=event, message=_message, **kwargs)
@classmethod
async def finish(cls,
message: Optional[Union[str, Message, MessageSegment,
MessageTemplate]] = None,
**kwargs) -> NoReturn:
"""
:说明:
发送一条消息给当前交互用户并结束当前事件响应器
:参数:
* ``message: Union[str, Message, MessageSegment]``: 消息内容
* ``**kwargs``: 其他传递给 ``bot.send`` 的参数,请参考对应 adapter 的 bot 对象 api
"""
bot = current_bot.get()
event = current_event.get()
state = current_state.get()
if isinstance(message, MessageTemplate):
_message = message.format(**state)
else:
_message = message
if _message is not None:
await bot.send(event=event, message=_message, **kwargs)
raise FinishedException
@classmethod
async def pause(cls,
prompt: Optional[Union[str, Message, MessageSegment,
MessageTemplate]] = None,
**kwargs) -> NoReturn:
"""
:说明:
发送一条消息给当前交互用户并暂停事件响应器,在接收用户新的一条消息后继续下一个处理函数
:参数:
* ``prompt: Union[str, Message, MessageSegment]``: 消息内容
* ``**kwargs``: 其他传递给 ``bot.send`` 的参数,请参考对应 adapter 的 bot 对象 api
"""
bot = current_bot.get()
event = current_event.get()
state = current_state.get()
if isinstance(prompt, MessageTemplate):
_prompt = prompt.format(**state)
else:
_prompt = prompt
if _prompt is not None:
await bot.send(event=event, message=_prompt, **kwargs)
raise PausedException
@classmethod
async def reject(cls,
prompt: Optional[Union[str, Message,
MessageSegment]] = None,
**kwargs) -> NoReturn:
"""
:说明:
发送一条消息给当前交互用户并暂停事件响应器,在接收用户新的一条消息后重新运行当前处理函数
:参数:
* ``prompt: Union[str, Message, MessageSegment]``: 消息内容
* ``**kwargs``: 其他传递给 ``bot.send`` 的参数,请参考对应 adapter 的 bot 对象 api
"""
bot = current_bot.get()
event = current_event.get()
state = current_state.get()
if "_current_key" in state and f"_{state['_current_key']}_parsed" in state:
del state[f"_{state['_current_key']}_parsed"]
if isinstance(prompt, MessageTemplate):
_prompt = prompt.format(**state)
else:
_prompt = prompt
if _prompt is not None:
await bot.send(event=event, message=_prompt, **kwargs)
raise RejectedException
def stop_propagation(self):
"""
:说明:
阻止事件传播
"""
self.block = True
# 运行handlers
async def run(self,
bot: Bot,
event: Event,
state: T_State,
stack: Optional[AsyncExitStack] = None,
dependency_cache: Optional[T_DependencyCache] = None):
b_t = current_bot.set(bot)
e_t = current_event.set(event)
s_t = current_state.set(self.state)
try:
# Refresh preprocess state
self.state = await self._default_state_factory(
bot, event) if self._default_state_factory else self.state
self.state.update(state)
while self.handlers:
handler = self.handlers.pop(0)
logger.debug(f"Running handler {handler}")
try:
await handler(matcher=self,
bot=bot,
event=event,
state=self.state,
_stack=stack,
_dependency_cache=dependency_cache)
except SkippedException:
pass
except RejectedException:
self.handlers.insert(0, handler) # type: ignore
updater = self.__class__._default_type_updater
if updater:
type_ = await updater(
bot,
event,
self.state, # type: ignore
self.type)
else:
type_ = "message"
updater = self.__class__._default_permission_updater
if updater:
permission = await updater(bot, event, self.state,
self.permission)
else:
permission = USER(event.get_session_id(), perm=self.permission)
Matcher.new(
type_,
Rule(),
permission,
self.handlers,
temp=True,
priority=0,
block=True,
plugin=self.plugin,
module=self.module,
expire_time=datetime.now() + bot.config.session_expire_timeout,
default_state=self.state,
default_parser=self.__class__._default_parser,
default_type_updater=self.__class__._default_type_updater,
default_permission_updater=self.__class__.
_default_permission_updater)
except PausedException:
updater = self.__class__._default_type_updater
if updater:
type_ = await updater(
bot,
event,
self.state, # type: ignore
self.type)
else:
type_ = "message"
updater = self.__class__._default_permission_updater
if updater:
permission = await updater(bot, event, self.state,
self.permission)
else:
permission = USER(event.get_session_id(), perm=self.permission)
Matcher.new(
type_,
Rule(),
permission,
self.handlers,
temp=True,
priority=0,
block=True,
plugin=self.plugin,
module=self.module,
expire_time=datetime.now() + bot.config.session_expire_timeout,
default_state=self.state,
default_parser=self.__class__._default_parser,
default_type_updater=self.__class__._default_type_updater,
default_permission_updater=self.__class__.
_default_permission_updater)
except FinishedException:
pass
except StopPropagation:
self.block = True
finally:
logger.info(f"Matcher {self} running complete")
current_bot.reset(b_t)
current_event.reset(e_t)
current_state.reset(s_t)