import asyncio
from sqlalchemy.orm import selectinload
from orm.rbac import Role


class RoleStorage:
    roles = {}
    lock = asyncio.Lock()

    @staticmethod
    def init(session):
        self = RoleStorage
        roles = session.query(Role).options(selectinload(Role.permissions)).all()
        self.roles = dict([(role.id, role) for role in roles])
        print("[auth.roles] %d precached" % len(roles))

    @staticmethod
    async def get_role(id):
        self = RoleStorage
        async with self.lock:
            return self.roles.get(id)

    @staticmethod
    async def add_role(role):
        self = RoleStorage
        async with self.lock:
            self.roles[id] = role

    @staticmethod
    async def del_role(id):
        self = RoleStorage
        async with self.lock:
            del self.roles[id]