[英]How to rewrite a function under async/await?
我想停止使用异步库,将其替换为vanilla js。
const async = require('async')
function getTopicsData(tids, Uid, callback) {
async.map(tids, (tid, next) => {
redis.hgetall(`topic:${tid}`, (err, topics) => {
redis.sismember(`topic:${tid}:subscribers`, Uid, (err, subscriber) => {
topics.subscriber = !!subscriber
next(false, topics)
})
})
}, callback)
}
module.exports = getTopicsData
我将实施的解决方案还包括bluebird
。 这是我将如何使用它。
const Promise = require('bluebird')
const hgetall = Promise.promisify('redis.hgetall')
const sismember = Promise.promisify('redis.sismember')
module.exports = async function (tids, Uid) {
return Promise.map(tids, async function (tid) {
let {topics, subscriber} = await Promise.props({
topics: hgetall(`topic:${tid}`),
subscriber: sismember(`topic:${tid}:subscribers`, Uid)
})
topics.subscriber = !!subscriber
return topics
})
}
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