simple redis get set with json values

redis-get-set-json.js

/*

⚠️expires keys in 10min so it's only good for temp data

Install:

npm install redis lodash

Usage:

redisGet('my-key', (err, res) => {
  if (err !== undefined && err !== null) {
    return console.error('error getting redis key', key, err)
  }
  
  console.log('redisGet res', res)
})

redisSet('my-key', {ok: true}, (err) => {
  if (err !== undefined && err !== null) {
    return console.error('error saving redis key', key, opts, err)
  }
  
  console.log('redisSet saved', key)
})

*/

let redis = require('redis')
let noop = require('lodash/noop')
let redisExpireSeconds = 600 // 10min

/**
 * Get a key and parse as json
 * @method redisGet
 * @param {string} key
 * @param {function} done
 */
let redisGet = (key, done) =>
  redis.get(key, (err, res) => {
    if (err !== null && err !== undefined) {
      console.error('error reading redis', key, err)
      return done(err)
    }
    if (res === null) {
      return done(null, null)
    }
    done(null, JSON.parse(res))
  })

/**
 * Set a key and stringify the value into it
 * ⚠️expires the key in 10min
 * @method
 * @param {string} key
 * @param {object} opts
 * @param {function} done
 */
let redisSet = (key, opts, done = noop) => {
  redis.set(key, JSON.stringify(opts), done)
  redis.expire(key, redisExpireSeconds, noop)
}

module.exports = {redisGet, redisSet}