Question

我的后端Nodejs必须对外部服务进行一些API GET请求调用，以检索数据并用作网页。这些API调用正在缓存中。由于我使用的是Heroku，因此每次应用进入休眠状态时都会删除此数据。是否有任何持久性缓存库？目前，我正在使用lru-cache和axios-extensions。

const axios = require('axios');
const { cacheAdapterEnhancer } = require('axios-extensions');
const LRUCache = require("lru-cache")

const options = {
    defaultCache: new LRUCache({ maxAge: 60 * 60 * 1000, max: 100 })
}

const http = axios.create({
        headers: { 'Cache-Control': 'no-cache' },
        timeout: 60000,
        adapter: cacheAdapterEnhancer(axios.defaults.adapter)
    }
)

getData: async () => {
    try {
        const response = await http.get(url, config)
        const data = response.data
        return data
    } catch (error) {
        console.log(error)
    }
}

Answer 1

正如@giankotarola在评论中建议的那样，我需要使用缓存数据库来解决该问题。最终，我设法使用Redis使其工作！我的最终代码：

const axios = require('axios')
const redis = require('redis')

// create and connect redis client to local instance.
const client = redis.createClient()

// Print redis errors to the console
client.on('error', (err) => {
    console.log("Error " + err)
});

const http = axios.create({
    headers: { 'Cache-Control': 'no-cache' },
    timeout: 60000
}
)

let config = {
    headers: {
        Authorization: `Bearer ${API_KEY}`,
    }
}

let url = 'https://example.com'

module.exports={
    getData: async () => {
        try {
            // Try to get response from Redis store
            const response = await client.get(url)
            return responseJSON = JSON.parse(response)
        } catch (err) {
            try {
                const response = await http.get(url, config)
                const data = response.data

                // Save response in Redis store
                client.setex(url, 60 * 60 * 1000, JSON.stringify(data));
                return data
            } catch (error) {
                console.log(error)
            }
        }
    }
}

即使节点进程终止，也使缓存持久化

1 个答案: