mirror of
https://github.com/nonebot/nonebot2.git
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269 lines
8.2 KiB
Python
269 lines
8.2 KiB
Python
"""
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事件处理
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========
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NoneBot 内部处理并按优先级分发事件给所有事件响应器，提供了多个插槽以进行事件的预处理等。
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"""
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import asyncio
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from datetime import datetime
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from typing import Set, Type, Optional, Iterable, TYPE_CHECKING
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from nonebot.log import logger
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from nonebot.rule import TrieRule
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from nonebot.matcher import matchers, Matcher
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from nonebot.exception import IgnoredException, StopPropagation, NoLogException
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from nonebot.typing import T_State, T_EventPreProcessor, T_RunPreProcessor, T_EventPostProcessor, T_RunPostProcessor
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if TYPE_CHECKING:
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from nonebot.adapters import Bot, Event
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_event_preprocessors: Set[T_EventPreProcessor] = set()
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_event_postprocessors: Set[T_EventPostProcessor] = set()
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_run_preprocessors: Set[T_RunPreProcessor] = set()
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_run_postprocessors: Set[T_RunPostProcessor] = set()
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def event_preprocessor(func: T_EventPreProcessor) -> T_EventPreProcessor:
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"""
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:说明:
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事件预处理。装饰一个函数，使它在每次接收到事件并分发给各响应器之前执行。
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:参数:
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事件预处理函数接收三个参数。
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* ``bot: Bot``: Bot 对象
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* ``event: Event``: Event 对象
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* ``state: T_State``: 当前 State
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"""
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_event_preprocessors.add(func)
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return func
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def event_postprocessor(func: T_EventPostProcessor) -> T_EventPostProcessor:
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"""
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:说明:
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事件后处理。装饰一个函数，使它在每次接收到事件并分发给各响应器之后执行。
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:参数:
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事件后处理函数接收三个参数。
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* ``bot: Bot``: Bot 对象
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* ``event: Event``: Event 对象
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* ``state: T_State``: 当前事件运行前 State
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"""
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_event_postprocessors.add(func)
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return func
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def run_preprocessor(func: T_RunPreProcessor) -> T_RunPreProcessor:
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"""
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:说明:
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运行预处理。装饰一个函数，使它在每次事件响应器运行前执行。
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:参数:
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运行预处理函数接收四个参数。
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* ``matcher: Matcher``: 当前要运行的事件响应器
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* ``bot: Bot``: Bot 对象
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* ``event: Event``: Event 对象
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* ``state: T_State``: 当前 State
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"""
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_run_preprocessors.add(func)
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return func
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def run_postprocessor(func: T_RunPostProcessor) -> T_RunPostProcessor:
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"""
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:说明:
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运行后处理。装饰一个函数，使它在每次事件响应器运行后执行。
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:参数:
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运行后处理函数接收五个参数。
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* ``matcher: Matcher``: 运行完毕的事件响应器
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* ``exception: Optional[Exception]``: 事件响应器运行错误（如果存在）
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* ``bot: Bot``: Bot 对象
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* ``event: Event``: Event 对象
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* ``state: T_State``: 当前 State
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"""
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_run_postprocessors.add(func)
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return func
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async def _check_matcher(priority: int, bot: "Bot", event: "Event",
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state: T_State) -> Iterable[Type[Matcher]]:
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current_matchers = matchers[priority].copy()
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async def _check(Matcher: Type[Matcher], bot: "Bot", event: "Event",
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state: T_State) -> Optional[Type[Matcher]]:
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try:
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if (not Matcher.expire_time or datetime.now() <= Matcher.expire_time
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) and await Matcher.check_perm(
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bot, event) and await Matcher.check_rule(bot, event, state):
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return Matcher
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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f"<r><bg #f8bbd0>Rule check failed for {Matcher}.</bg #f8bbd0></r>"
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)
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return None
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async def _check_expire(Matcher: Type[Matcher]) -> Optional[Type[Matcher]]:
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if Matcher.temp or (Matcher.expire_time and
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datetime.now() > Matcher.expire_time):
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return Matcher
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return None
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checking_tasks = [
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_check(Matcher, bot, event, state) for Matcher in current_matchers
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]
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checking_expire_tasks = [
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_check_expire(Matcher) for Matcher in current_matchers
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]
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results = await asyncio.gather(*checking_tasks, return_exceptions=True)
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expired = await asyncio.gather(*checking_expire_tasks)
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for expired_matcher in filter(lambda x: x, expired):
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try:
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matchers[priority].remove(expired_matcher) # type: ignore
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except Exception:
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pass
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return filter(lambda x: x, results)
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async def _run_matcher(Matcher: Type[Matcher], bot: "Bot", event: "Event",
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state: T_State) -> None:
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logger.info(f"Event will be handled by {Matcher}")
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matcher = Matcher()
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coros = list(
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map(lambda x: x(matcher, bot, event, state), _run_preprocessors))
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if coros:
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try:
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await asyncio.gather(*coros)
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except IgnoredException:
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logger.opt(colors=True).info(
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f"Matcher {matcher} running is <b>cancelled</b>")
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return
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Error when running RunPreProcessors. "
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"Running cancelled!</bg #f8bbd0></r>")
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return
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exception = None
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try:
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logger.debug(f"Running matcher {matcher}")
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await matcher.run(bot, event, state)
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except StopPropagation as e:
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exception = e
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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f"<r><bg #f8bbd0>Running matcher {matcher} failed.</bg #f8bbd0></r>"
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)
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exception = e
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coros = list(
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map(lambda x: x(matcher, exception, bot, event, state),
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_run_postprocessors))
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if coros:
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try:
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await asyncio.gather(*coros)
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Error when running RunPostProcessors</bg #f8bbd0></r>"
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)
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if matcher.block or isinstance(exception, StopPropagation):
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raise StopPropagation
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return
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async def handle_event(bot: "Bot", event: "Event"):
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"""
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:说明:
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处理一个事件。调用该函数以实现分发事件。
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:参数:
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* ``bot: Bot``: Bot 对象
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* ``event: Event``: Event 对象
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:示例:
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.. code-block:: python
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import asyncio
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asyncio.create_task(handle_event(bot, event))
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"""
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show_log = True
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log_msg = f"<m>{bot.type.upper()} {bot.self_id}</m> | "
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try:
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log_msg += event.get_log_string()
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except NoLogException:
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show_log = False
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if show_log:
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logger.opt(colors=True).info(log_msg)
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state = {}
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coros = list(map(lambda x: x(bot, event, state), _event_preprocessors))
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if coros:
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try:
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logger.debug("Running PreProcessors...")
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await asyncio.gather(*coros)
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except IgnoredException:
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logger.opt(colors=True).info(
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f"Event {event.get_event_name()} is <b>ignored</b>")
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return
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Error when running EventPreProcessors. "
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"Event ignored!</bg #f8bbd0></r>")
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return
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# Trie Match
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_, _ = TrieRule.get_value(bot, event, state)
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break_flag = False
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for priority in sorted(matchers.keys()):
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if break_flag:
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break
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if show_log:
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logger.debug(f"Checking for matchers in priority {priority}...")
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run_matchers = await _check_matcher(priority, bot, event, state)
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pending_tasks = [
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_run_matcher(matcher, bot, event, state.copy())
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for matcher in run_matchers
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]
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results = await asyncio.gather(*pending_tasks, return_exceptions=True)
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for result in results:
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if isinstance(result, StopPropagation):
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if not break_flag:
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break_flag = True
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logger.debug("Stop event propagation")
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coros = list(map(lambda x: x(bot, event, state), _event_postprocessors))
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if coros:
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try:
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logger.debug("Running PostProcessors...")
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await asyncio.gather(*coros)
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except Exception as e:
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logger.opt(colors=True, exception=e).error(
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"<r><bg #f8bbd0>Error when running EventPostProcessors</bg #f8bbd0></r>"
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)
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