nonebot2/nonebot/utils.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re
import json
import asyncio
import dataclasses
from functools import wraps, partial

from nonebot.typing import Any, Callable, Awaitable, overrides


def escape_tag(s: str) -> str:
    return re.sub(r"</?((?:[fb]g\s)?[^<>\s]*)>", r"\\\g<0>", s)


def run_sync(func: Callable[..., Any]) -> Callable[..., Awaitable[Any]]:
    """
    :说明:
      一个用于包装 sync function 为 async function 的装饰器
    :参数:
      * ``func: Callable[..., Any]``: 被装饰的同步函数
    :返回:
      - ``Callable[..., Awaitable[Any]]``
    """

    @wraps(func)
    async def _wrapper(*args: Any, **kwargs: Any) -> Any:
        loop = asyncio.get_running_loop()
        pfunc = partial(func, *args, **kwargs)
        result = await loop.run_in_executor(None, pfunc)
        return result

    return _wrapper


class DataclassEncoder(json.JSONEncoder):
    """
    :说明:
      在JSON序列化 ``Message`` (List[Dataclass]) 时使用的 ``JSONEncoder``
    """

    @overrides(json.JSONEncoder)
    def default(self, o):
        if dataclasses.is_dataclass(o):
            return dataclasses.asdict(o)
        return super().default(o)