feat: 添加配置文件迁移阶段

pkg/config/migration.py

@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import abc
+import typing
+
+from ..core import app
+
+
+preregistered_migrations: list[typing.Type[Migration]] = []
+
+def migration_class(name: str, number: int):
+    """注册一个迁移
+    """
+    def decorator(cls: typing.Type[Migration]) -> typing.Type[Migration]:
+        cls.name = name
+        cls.number = number
+        preregistered_migrations.append(cls)
+        return cls
+    
+    return decorator
+
+
+class Migration(abc.ABC):
+    """一个版本的迁移
+    """
+
+    name: str
+
+    number: int
+
+    ap: app.Application
+
+    def __init__(self, ap: app.Application):
+        self.ap = ap
+    
+    @abc.abstractmethod
+    async def need_migrate(self) -> bool:
+        """判断当前环境是否需要运行此迁移
+        """
+        pass
+
+    @abc.abstractmethod
+    async def run(self):
+        """执行迁移
+        """
+        pass