Get Redis connection

        This property is awaitable.

async def redis(self) -> aioredis.Redis:
        """
        Get Redis connection

        This property is awaitable.
        """
        # Use thread-safe asyncio Lock because this method without that is not safe
        async with self._connection_lock:
            if self._redis is None:
                self._redis = await aioredis.create_redis_pool((self._host, self._port),
                                                               db=self._db, password=self._password, ssl=self._ssl,
                                                               minsize=1, maxsize=self._pool_size,
                                                               loop=self._loop, **self._kwargs)
        return self._redis