promise-cache-memorize

Memoize promise-returning functions.

Usage

const Cache = require('promise-cache-memorize')('redis')

const requestWithCache = Cache.remember('request', request)

cacheFactory(type, options) -> Cache

Factory function that configuring and returning actual Cache object.

• type - cache backend. Current support simple , lru or redis

• options - cache backend configuration.

  • timeout - (default: 3600) cache expire timeout, 1 hour by default

  • if it is redis backend, see ioredis document

  • if it is lru backend, see lru document

Cache.remember(key, fn, maxAge) -> memorizedFn

Memorize promise-returning functions fn with key.

• fn - function that returning promise.
• key - string using as cache key.
• maxAge - (default: options.timeout) cache expired after maxAge seconds.

Example

const request = require('request-promise')
const Cache = require('promise-cache-memorize')('redis')

const requestWithCache = Cache.remember('request', request)

function sendRequest () {
  return requestWithCache('http://httpbin.org/get')
}

sendRequest().then((res) => {
  console.log(res)

  // hit cache
  sendRequest().then((res) => {
    console.log(res)
  })
})

TODO

• Provide options for cache type
• Multiple cache backend support

License

MIT