from redis import asyncio as aioredis


class RedisHelper(object):
    _pool: aioredis.connection.ConnectionPool = None
    _instance = None

    def __new__(cls, *args, **kwargs):
        if cls._instance is None:
            cls._instance = super().__new__(cls, *args, **kwargs)
        return cls._instance

    def _get_pool(self) -> aioredis.connection.ConnectionPool:
        if self._pool is None:
            self._pool = aioredis.ConnectionPool(
                host="r-bp1mb0v08fqi4hjffupd.redis.rds.aliyuncs.com",  # 外网地址
                port=6379,
                db=0,
                password="Wqsd@2019",
                max_connections=10)
        return self._pool

    def get_client(self) -> aioredis.client.Redis:
        pool = self._get_pool()
        client = aioredis.Redis(connection_pool=pool)

        return client

    async def close(self):
        if self._pool:
            await self._pool.disconnect(inuse_connections=True)