Cache that implements expiration on top of flat-cache

Cache.js

'use strict'

const flatCache = require('flat-cache')

module.exports = class Cache {
  constructor (name, path, cacheTime = 0) {
    this.name = name
    this.path = path
    this.cache = flatCache.load(name, path)
    this.expire = cacheTime === 0 ? false : cacheTime * 1000 * 60
  }
  getKey (key) {
    var now = new Date().getTime()
    var value = this.cache.getKey(key)
    if (value === undefined || (value.expire !== false && value.expire < now)) {
      return undefined
    } else {
      return value.data
    }
  }
  setKey (key, value) {
    var now = new Date().getTime()
    this.cache.setKey(key, {
      expire: this.expire === false ? false : now + this.expire,
      data: value
    })
  }
  removeKey (key) {
    this.cache.removeKey(key)
  }
  save () {
    this.cache.save(true)
  }
  remove () {
    flatCache.clearCacheById(this.name, this.path)
  }
}

Why don't you make a npm module for this? It's a very helpful one.

Sorry for the late reply (I must have missed the notification), thanks for commenting!

I think there are tons of caching libraries on npm already that do things the same way, so I did not bother.
But if it's helpful to people, maybe I can make a PR to the flat-cache library I used in this gist.

I want to suggest an update that you remove the expired data from the cache when you get and check them.

This will be useful especially that you use the noPrune option on saving.

I want to suggest an update that you remove the expired data from the cache when you get and check them.

This will be useful especially that you use the noPrune option on saving.

Thanks for the suggestion, is this what you mean?

  getKey (key) {
    var now = new Date().getTime()
    var value = this.cache.getKey(key)
    if (value === undefined) {
      return undefined
    } else {
      if (value.expire !== false && value.expire < now)) {
        this.removeKey(key)
        return undefined
      } else {
        return value.data
      }
    }
  }