mirror of
https://github.com/jxxghp/MoviePilot.git
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326 lines
11 KiB
Python
326 lines
11 KiB
Python
"""插件安装事务的持久化端口与可逆状态记录。"""
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from __future__ import annotations
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import re
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from dataclasses import dataclass
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from datetime import datetime
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from enum import StrEnum
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from functools import partial
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from typing import Protocol, TypeVar
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from app.application.database import AsyncDatabaseExecutor
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from app.application.plugin.identity import PluginIdentity
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T = TypeVar("T")
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class PluginInstallationPhase(StrEnum):
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"""安装事务在持久化协调器中的两个数据库阶段。"""
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PREPARED = "prepared"
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COMMITTED = "committed"
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class PluginInstallationConflictError(RuntimeError):
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"""事务不存在、阶段竞争或实际状态发生漂移。"""
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class PluginInstallationRecordError(ValueError):
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"""事务记录不符合可持久化和恢复合同。"""
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_TRANSACTION_ID_PATTERN = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$")
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INSTALLATION_JOURNAL_SCHEMA_VERSION = 1
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def _validate_revision(value: int | None, *, field_name: str) -> None:
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"""校验身份 CAS revision；``None`` 表示对应身份行不存在。"""
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if value is None:
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return
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if isinstance(value, bool) or not isinstance(value, int) or value < 1:
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raise PluginInstallationRecordError(
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f"{field_name} 必须是大于等于 1 的整数或 null"
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)
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@dataclass(frozen=True, slots=True)
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class PluginInstallationRecord:
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"""可跨进程恢复的插件安装事务状态。"""
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transaction_id: str
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plugin_id: str
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phase: PluginInstallationPhase
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membership_before: bool
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membership_target: bool | None
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identity_before_revision: int | None
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identity_target_revision: int | None
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package_existed: bool
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persistent_backup_existed: bool
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created_at: datetime
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updated_at: datetime
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schema_version: int = INSTALLATION_JOURNAL_SCHEMA_VERSION
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def __post_init__(self) -> None:
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"""拒绝不能作为 CAS 或崩溃恢复依据的事务记录。"""
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if not _TRANSACTION_ID_PATTERN.fullmatch(self.transaction_id):
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raise PluginInstallationRecordError("transaction_id 格式不合法")
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if not self.plugin_id or self.plugin_id != self.plugin_id.strip():
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raise PluginInstallationRecordError("plugin_id 不能为空或带首尾空格")
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if not isinstance(self.phase, PluginInstallationPhase):
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try:
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object.__setattr__(self, "phase", PluginInstallationPhase(self.phase))
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except ValueError as error:
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raise PluginInstallationRecordError("未知安装事务 phase") from error
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if not isinstance(self.membership_before, bool):
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raise PluginInstallationRecordError("membership_before 必须是布尔值")
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if not isinstance(self.package_existed, bool):
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raise PluginInstallationRecordError("package_existed 必须是布尔值")
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if not isinstance(self.persistent_backup_existed, bool):
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raise PluginInstallationRecordError(
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"persistent_backup_existed 必须是布尔值"
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)
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if self.membership_target is not None and not isinstance(
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self.membership_target,
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bool,
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):
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raise PluginInstallationRecordError("membership_target 必须是布尔值或 null")
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if (
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self.phase is PluginInstallationPhase.COMMITTED
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and self.membership_target is None
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):
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raise PluginInstallationRecordError(
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"COMMITTED 事务必须包含 membership target"
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)
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_validate_revision(
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self.identity_before_revision,
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field_name="identity_before_revision",
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)
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_validate_revision(
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self.identity_target_revision,
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field_name="identity_target_revision",
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)
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if self.created_at.tzinfo is None or self.updated_at.tzinfo is None:
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raise PluginInstallationRecordError("事务时间必须包含时区")
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if self.updated_at < self.created_at:
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raise PluginInstallationRecordError("事务更新时间不能早于创建时间")
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if (
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isinstance(self.schema_version, bool)
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or not isinstance(self.schema_version, int)
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or self.schema_version != INSTALLATION_JOURNAL_SCHEMA_VERSION
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):
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raise PluginInstallationRecordError(
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f"不支持的插件安装事务快照版本: {self.schema_version}"
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)
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class PluginInstallationStore(Protocol):
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"""安装 Gateway 使用的同步持久化端口。"""
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def create(self, record: PluginInstallationRecord) -> PluginInstallationRecord:
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"""创建一条 PREPARED 安装事务。"""
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def get(self, transaction_id: str) -> PluginInstallationRecord | None:
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"""按事务 ID 读取记录。"""
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def list(
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self,
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*,
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plugin_id: str | None = None,
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) -> list[PluginInstallationRecord]:
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"""列出事务记录。"""
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def set_target(
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self,
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transaction_id: str,
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*,
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membership_target: bool,
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identity_target: PluginIdentity | None,
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expected_phase: PluginInstallationPhase,
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) -> PluginInstallationRecord:
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"""在 PREPARED 阶段登记目标 membership 和身份 revision。"""
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def commit_target(
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self,
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transaction_id: str,
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*,
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identity_target: PluginIdentity | None,
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expected_phase: PluginInstallationPhase,
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) -> PluginInstallationRecord:
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"""在同一同步事务中完成身份、membership 和 COMMITTED phase。"""
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def delete(
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self,
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transaction_id: str,
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*,
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expected_phase: PluginInstallationPhase,
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) -> bool:
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"""按 phase CAS 删除已处理的事务记录。"""
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class PluginIdentityPersistence(Protocol):
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"""插件来源身份读取与存量迁移使用的同步窄端口。"""
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def get(self, plugin_id: str) -> PluginIdentity | None:
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"""读取一个物理插件的来源身份。"""
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def compare_and_set(
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self,
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identity: PluginIdentity,
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*,
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expected_revision: int | None,
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) -> PluginIdentity:
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"""仅供存量迁移首次创建或按 revision 更新身份。"""
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def bind_online(
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self,
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identity: PluginIdentity,
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*,
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expected_revision: int,
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) -> PluginIdentity:
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"""把存量未绑定身份按 revision 绑定到在线来源。"""
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class PluginPersistenceService:
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"""通过有界数据库 worker 暴露插件专用异步持久化能力。"""
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def __init__(
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self,
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*,
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executor: AsyncDatabaseExecutor,
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identities: PluginIdentityPersistence,
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installations: PluginInstallationStore,
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) -> None:
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"""保存身份、安装事务和唯一同步数据库执行边界。"""
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self.__executor = executor
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self.__identities = identities
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self.__installations = installations
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async def get_identity(self, plugin_id: str) -> PluginIdentity | None:
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"""在数据库 worker 中读取插件来源身份。"""
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return await self.__executor.run(partial(self.__identities.get, plugin_id))
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async def migrate_identity(
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self,
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identity: PluginIdentity,
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*,
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expected_revision: int | None,
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) -> PluginIdentity:
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"""在数据库 worker 中提交存量身份迁移。"""
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return await self.__executor.run(
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partial(
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self.__identities.compare_and_set,
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identity,
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expected_revision=expected_revision,
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)
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)
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async def bind_online_identity(
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self,
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identity: PluginIdentity,
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*,
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expected_revision: int,
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) -> PluginIdentity:
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"""在数据库 worker 中绑定存量身份的可信在线来源。"""
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return await self.__executor.run(
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partial(
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self.__identities.bind_online,
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identity,
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expected_revision=expected_revision,
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)
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)
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async def create_installation(
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self,
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record: PluginInstallationRecord,
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) -> PluginInstallationRecord:
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"""创建 PREPARED journal。"""
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return await self.__executor.run(
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partial(self.__installations.create, record)
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)
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async def list_installations(self) -> list[PluginInstallationRecord]:
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"""列出全部待恢复或待清理的安装 journal。"""
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return await self.__executor.run(self.__installations.list)
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async def get_installation(
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self,
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transaction_id: str,
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) -> PluginInstallationRecord | None:
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"""读取一次提交结果确认所需的安装 journal。"""
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return await self.__executor.run(
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partial(self.__installations.get, transaction_id)
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)
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async def set_installation_target(
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self,
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transaction_id: str,
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*,
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membership_target: bool,
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identity_target: PluginIdentity | None,
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) -> PluginInstallationRecord:
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"""在 PREPARED journal 中登记最终数据库目标。"""
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return await self.__executor.run(
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partial(
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self.__installations.set_target,
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transaction_id,
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membership_target=membership_target,
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identity_target=identity_target,
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expected_phase=PluginInstallationPhase.PREPARED,
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)
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)
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async def commit_installation(
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self,
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transaction_id: str,
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*,
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identity_target: PluginIdentity | None,
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) -> PluginInstallationRecord:
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"""原子提交 membership、身份和 COMMITTED phase。"""
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return await self.__executor.run(
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partial(
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self.__installations.commit_target,
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transaction_id,
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identity_target=identity_target,
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expected_phase=PluginInstallationPhase.PREPARED,
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)
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)
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async def delete_installation(
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self,
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transaction_id: str,
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*,
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expected_phase: PluginInstallationPhase,
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) -> bool:
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"""按 phase 删除已恢复或已收尾的 journal。"""
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return await self.__executor.run(
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partial(
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self.__installations.delete,
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transaction_id,
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expected_phase=expected_phase,
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)
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)
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_PLUGIN_PERSISTENCE: list[PluginPersistenceService] = []
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def configure_plugin_persistence(service: PluginPersistenceService) -> None:
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"""由启动组合根登记当前 lifespan 的插件持久化服务。"""
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_PLUGIN_PERSISTENCE.clear()
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_PLUGIN_PERSISTENCE.append(service)
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def get_plugin_persistence() -> PluginPersistenceService:
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"""返回当前插件持久化服务，未装配时拒绝数据库操作。"""
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if not _PLUGIN_PERSISTENCE:
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raise RuntimeError("插件持久化服务尚未完成初始化")
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return _PLUGIN_PERSISTENCE[0]
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def reset_plugin_persistence() -> None:
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"""清除当前 lifespan 的插件持久化服务。"""
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_PLUGIN_PERSISTENCE.clear()
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