Hypercache

Simple but powerful caching.

Hypercache caches async db operations and gives you the abbility to get things by id or search the database completly sync and with speeds otherwise impossible.

Why hypercache?

• ## Fast
• ## Zero-Dependencies
• ## 100% Test Coverage

Usage

new Hypercache(fnc, options)

• fnc: A function that is called as fnc(cb)
  • cb(err, res)
  • err: The error that occured, if any
  • res: An array of objects
• options
  • name: An optional name. If not provided the name will be guessed based on the function
  • keys: A list of unique properties like ["id"]
  • sets: A list of non-unique (also array) properties like ["aliases"]
  • interval: The interval to refresh in ms (default 2500)
  • manual: This will disable the fnc and interval and will expose an update function that is called as update(res)
  • sync: A hypercache to sync with. This will override the call for fnc to fnc(opt.sync.getAll(), cb) and disable the interval.

Events

ready: Emitted when the first update occurs

update: Emitted when an update occurs

error: Emitted when a function without a callback throws an error

Methods

getAll(): Returns an array of all elements

getMap(name): Returns the id->object map for key name

getBy(id, value): Returns an object with [id]==value

getSetMap(name): Returns the id->set map for key name

getSet(id, value): Returns an array with [id]==value || [id].indexOf(value)

search(str): Searches through all keys and returns the first with [key]==str

searchSets(str): Seracher through all sets and returns the first with [key]==value || [key].indexOf(value)

Examples

Fetch and cache data from mongoDB

const cache = new Hypercache(cb => Users.find({}, cb), {
  keys: ["id", "username"],
  sets: ["aliases"]
})
cache.once("ready", () => {
  cache.getBy("username", "mkg20001") // {username: "mkg20001", id: "1234", aliases: ["mkg", "krüger"], ...}
  cache.search("1234") // {username: "mkg20001", id: "1234", aliases: ["mkg", "krüger"], ...}
  cache.searchSets("mkg") // {username: "mkg20001", id: "1234", aliases: ["mkg", "krüger"], ...}
})