mirror of
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118 lines
3.5 KiB
Python
118 lines
3.5 KiB
Python
"""订阅删除应用用例及其依赖端口。"""
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from dataclasses import dataclass
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from typing import Awaitable, Callable, Mapping, Protocol
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@dataclass(frozen=True)
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class SubscribeDeletionActor:
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"""执行订阅删除的用户身份。"""
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username: str
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is_superuser: bool
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@dataclass(frozen=True)
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class SubscribeDeletionCandidate:
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"""删除前读取出的订阅快照，不向应用层暴露 ORM 对象。"""
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subscribe_id: int
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username: str | None
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event_payload: Mapping[str, object]
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class SubscribeDeletionRepository(Protocol):
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"""订阅删除用例需要的最小数据访问端口。"""
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async def get_candidate(
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self,
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subscribe_id: int,
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) -> SubscribeDeletionCandidate | None:
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"""读取订阅及删除事件所需的稳定快照。"""
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...
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async def stage_delete(self, subscribe_id: int) -> None:
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"""把已读取的订阅登记为待删除，但不自行提交事务。"""
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...
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class AsyncUnitOfWork(Protocol):
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"""订阅写用例使用的异步事务端口。"""
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async def commit(self) -> None:
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"""提交当前事务。"""
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...
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async def rollback(self) -> None:
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"""回滚当前事务。"""
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...
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SubscribeDeletedPublisher = Callable[
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[int, Mapping[str, object]],
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Awaitable[None],
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]
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SubscribeDeletedReporter = Callable[[Mapping[str, object]], object]
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class DeleteSubscribeCommand:
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"""按权限删除订阅，并在提交成功后依次发送事件和统计上报。"""
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def __init__(
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self,
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repository: SubscribeDeletionRepository,
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unit_of_work: AsyncUnitOfWork,
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publish_deleted: SubscribeDeletedPublisher,
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report_deleted: SubscribeDeletedReporter,
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) -> None:
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"""注入数据访问、事务与提交后副作用端口。"""
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self._repository = repository
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self._unit_of_work = unit_of_work
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self._publish_deleted = publish_deleted
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self._report_deleted = report_deleted
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async def execute(
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self,
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subscribe_id: int,
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actor: SubscribeDeletionActor,
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) -> bool:
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"""
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删除当前用户可访问的订阅。
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返回 False 表示订阅不存在或无权访问；该结果由 API 映射为历史兼容的成功响应。
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提交后的事件与上报保持原有顺序，任一副作用失败都会继续向调用方抛出。
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"""
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candidate = await self._repository.get_candidate(subscribe_id)
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if not self._can_delete(candidate, actor):
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return False
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await self._repository.stage_delete(subscribe_id)
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try:
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await self._unit_of_work.commit()
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except Exception:
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await self._unit_of_work.rollback()
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raise
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event_payload = dict(candidate.event_payload)
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await self._publish_deleted(subscribe_id, event_payload)
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self._report_deleted(
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{
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"media_source": event_payload.get("media_source"),
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"media_id": event_payload.get("media_id"),
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"season": event_payload.get("season"),
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}
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)
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return True
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@staticmethod
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def _can_delete(
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candidate: SubscribeDeletionCandidate | None,
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actor: SubscribeDeletionActor,
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) -> bool:
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"""判断用户是否拥有目标订阅的删除权限。"""
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if candidate is None:
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return False
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if actor.is_superuser:
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return True
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return bool(candidate.username) and candidate.username == actor.username
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