我想使用redis作为我的数据库的缓存。我写了下面的代码，它给了我错误：

const offerData = await client.getAsync(offerID)
                               ^ TypeError: client.getAsync is not a function

我的当前代码：

const redis = require('redis')

// Connect to the Redis server
const client = redis.createClient()

client.on('connect', () => {
    console.log('[PASS]'.green + ' Redis Connected')
    require('bluebird').promisifyAll(redis)
})

router.get('/', async (req, res) => {
 const offerData = await client.getAsync(offerID)

    let link
    if (offerData) {
        // If the offer data is in Redis, parse it and assign it to the link variable
        link = JSON.parse(offerData)
    } else {
        // If the offer data is not in Redis, get it from the database and store it in Redis
        link = await Offers.findOne({_id: offerID})
        if (link == null) return res.sendStatus(404)
        client.set(offerID, JSON.stringify(link))
    }

//Do some
})

我该如何解决这个问题？尝试了promisifyAll，但没有成功