PamGram/core/plugin/_plugin.py

"""插件"""
import asyncio
from abc import ABC
from dataclasses import asdict
from datetime import timedelta
from functools import partial, wraps
from itertools import chain
from multiprocessing import RLock as Lock
from types import MethodType
from typing import (
    Any,
    ClassVar,
    Dict,
    Iterable,
    List,
    Optional,
    TYPE_CHECKING,
    Type,
    TypeVar,
    Union,
)

from pydantic import BaseModel
from telegram.ext import BaseHandler, ConversationHandler, Job, TypeHandler
from typing_extensions import ParamSpec

from core.handler.adminhandler import AdminHandler
from core.plugin._funcs import ConversationFuncs, PluginFuncs
from core.plugin._handler import ConversationDataType
from utils.const import WRAPPER_ASSIGNMENTS
from utils.helpers import isabstract
from utils.log import logger

if TYPE_CHECKING:
    from core.application import Application
    from core.plugin._handler import ConversationData, HandlerData, ErrorHandlerData
    from core.plugin._job import JobData
    from multiprocessing.synchronize import RLock as LockType

__all__ = ("Plugin", "PluginType", "get_all_plugins")

wraps = partial(wraps, assigned=WRAPPER_ASSIGNMENTS)
P = ParamSpec("P")
T = TypeVar("T")
R = TypeVar("R")

HandlerType = TypeVar("HandlerType", bound=BaseHandler)

_HANDLER_DATA_ATTR_NAME = "_handler_datas"
"""用于储存生成 handler 时所需要的参数（例如 block）的属性名"""

_CONVERSATION_HANDLER_ATTR_NAME = "_conversation_handler_data"
"""用于储存生成 ConversationHandler 时所需要的参数（例如 block）的属性名"""

_ERROR_HANDLER_ATTR_NAME = "_error_handler_data"

_JOB_ATTR_NAME = "_job_data"

_EXCLUDE_ATTRS = ["handlers", "jobs", "error_handlers"]


class _Plugin(PluginFuncs):
    """插件"""

    _lock: ClassVar["LockType"] = Lock()
    _asyncio_lock: ClassVar["LockType"] = asyncio.Lock()
    _installed: bool = False

    _handlers: Optional[List[HandlerType]] = None
    _error_handlers: Optional[List["ErrorHandlerData"]] = None
    _jobs: Optional[List[Job]] = None
    _application: "Optional[Application]" = None

    def set_application(self, application: "Application") -> None:
        self._application = application

    @property
    def application(self) -> "Application":
        if self._application is None:
            raise RuntimeError("No application was set for this Plugin.")
        return self._application

    @property
    def handlers(self) -> List[HandlerType]:
        """该插件的所有 handler"""
        with self._lock:
            if self._handlers is None:
                self._handlers = []

                for attr in dir(self):
                    if (
                        not (attr.startswith("_") or attr in _EXCLUDE_ATTRS)
                        and isinstance(func := getattr(self, attr), MethodType)
                        and (datas := getattr(func, _HANDLER_DATA_ATTR_NAME, []))
                    ):
                        for data in datas:
                            data: "HandlerData"
                            if data.admin:
                                self._handlers.append(
                                    AdminHandler(
                                        handler=data.type(
                                            callback=func,
                                            **data.kwargs,
                                        ),
                                        application=self.application,
                                    )
                                )
                            else:
                                self._handlers.append(
                                    data.type(
                                        callback=func,
                                        **data.kwargs,
                                    )
                                )
        return self._handlers

    @property
    def error_handlers(self) -> List["ErrorHandlerData"]:
        with self._lock:
            if self._error_handlers is None:
                self._error_handlers = []
                for attr in dir(self):
                    if (
                        not (attr.startswith("_") or attr in _EXCLUDE_ATTRS)
                        and isinstance(func := getattr(self, attr), MethodType)
                        and (datas := getattr(func, _ERROR_HANDLER_ATTR_NAME, []))
                    ):
                        for data in datas:
                            data: "ErrorHandlerData"
                            data.func = func
                            self._error_handlers.append(data)

        return self._error_handlers

    def _install_jobs(self) -> None:
        if self._jobs is None:
            self._jobs = []
        for attr in dir(self):
            # noinspection PyUnboundLocalVariable
            if (
                not (attr.startswith("_") or attr in _EXCLUDE_ATTRS)
                and isinstance(func := getattr(self, attr), MethodType)
                and (datas := getattr(func, _JOB_ATTR_NAME, []))
            ):
                for data in datas:
                    data: "JobData"
                    self._jobs.append(
                        getattr(self.application.telegram.job_queue, data.type)(
                            callback=func,
                            **data.kwargs,
                            **{
                                key: value
                                for key, value in asdict(data).items()
                                if key not in ["type", "kwargs", "dispatcher"]
                            },
                        )
                    )

    @property
    def jobs(self) -> List[Job]:
        with self._lock:
            if self._jobs is None:
                self._jobs = []
                self._install_jobs()
        return self._jobs

    async def initialize(self) -> None:
        """初始化插件"""

    async def shutdown(self) -> None:
        """销毁插件"""

    async def install(self) -> None:
        """安装"""
        group = id(self)
        if not self._installed:
            await self.initialize()
            # initialize 必须先执行 如果出现异常不会执行 add_handler 以免出现问题
            async with self._asyncio_lock:
                self._install_jobs()

                for h in self.handlers:
                    if not isinstance(h, TypeHandler):
                        self.application.telegram.add_handler(h, group)
                    else:
                        self.application.telegram.add_handler(h, -1)

                for h in self.error_handlers:
                    self.application.telegram.add_error_handler(h.func, h.block)
                self._installed = True

    async def uninstall(self) -> None:
        """卸载"""
        group = id(self)

        with self._lock:
            if self._installed:
                if group in self.application.telegram.handlers:
                    del self.application.telegram.handlers[id(self)]

                for h in self.handlers:
                    if isinstance(h, TypeHandler):
                        self.application.telegram.remove_handler(h, -1)
                for h in self.error_handlers:
                    self.application.telegram.remove_error_handler(h.func)

                for j in self.application.telegram.job_queue.jobs():
                    j.schedule_removal()
                await self.shutdown()
                self._installed = False

    async def reload(self) -> None:
        await self.uninstall()
        await self.install()


class _Conversation(_Plugin, ConversationFuncs, ABC):
    """Conversation类"""

    # noinspection SpellCheckingInspection
    class Config(BaseModel):
        allow_reentry: bool = False
        per_chat: bool = True
        per_user: bool = True
        per_message: bool = False
        conversation_timeout: Optional[Union[float, timedelta]] = None
        name: Optional[str] = None
        map_to_parent: Optional[Dict[object, object]] = None
        block: bool = False

    def __init_subclass__(cls, **kwargs):
        cls._conversation_kwargs = kwargs
        super(_Conversation, cls).__init_subclass__()
        return cls

    @property
    def handlers(self) -> List[HandlerType]:
        with self._lock:
            if self._handlers is None:
                self._handlers = []

                entry_points: List[HandlerType] = []
                states: Dict[Any, List[HandlerType]] = {}
                fallbacks: List[HandlerType] = []
                for attr in dir(self):
                    if (
                        not (attr.startswith("_") or attr in _EXCLUDE_ATTRS)
                        and (func := getattr(self, attr, None)) is not None
                        and (datas := getattr(func, _HANDLER_DATA_ATTR_NAME, []))
                    ):
                        conversation_data: "ConversationData"

                        handlers: List[HandlerType] = []
                        for data in datas:
                            handlers.append(
                                data.type(
                                    callback=func,
                                    **data.kwargs,
                                )
                            )

                        if conversation_data := getattr(func, _CONVERSATION_HANDLER_ATTR_NAME, None):
                            if (_type := conversation_data.type) is ConversationDataType.Entry:
                                entry_points.extend(handlers)
                            elif _type is ConversationDataType.State:
                                if conversation_data.state in states:
                                    states[conversation_data.state].extend(handlers)
                                else:
                                    states[conversation_data.state] = handlers
                            elif _type is ConversationDataType.Fallback:
                                fallbacks.extend(handlers)
                            else:
                                self._handlers.extend(handlers)
                        else:
                            self._handlers.extend(handlers)
                if entry_points and states and fallbacks:
                    kwargs = self._conversation_kwargs
                    kwargs.update(self.Config().dict())
                    self._handlers.append(ConversationHandler(entry_points, states, fallbacks, **kwargs))
                else:
                    temp_dict = {"entry_points": entry_points, "states": states, "fallbacks": fallbacks}
                    reason = map(lambda x: f"'{x[0]}'", filter(lambda x: not x[1], temp_dict.items()))
                    logger.warning(
                        "'%s' 因缺少 '%s' 而生成无法生成 ConversationHandler", self.__class__.__name__, ", ".join(reason)
                    )
        return self._handlers


class Plugin(_Plugin, ABC):
    """插件"""

    Conversation = _Conversation


PluginType = TypeVar("PluginType", bound=_Plugin)


def get_all_plugins() -> Iterable[Type[PluginType]]:
    """获取所有 Plugin 的子类"""
    return filter(
        lambda x: x.__name__[0] != "_" and not isabstract(x),
        chain(Plugin.__subclasses__(), _Conversation.__subclasses__()),
    )