hypertrie-storage.js

// Stores a hypercore feed & a hypertrie inside a hypertrie.
// The feed is stored under the prefix "feed/"
// The trie is stored under the prefix "key-value/"

const hypercore = require('hypercore')
const hypertrie = require('hypertrie')
const rakv = require('random-access-key-value')
const ram = require('random-access-memory')

function hypertrieStorage(hypertrie, prefix) {
  const db = {
    get: function(key, cb) {
      return hypertrie.get(key, (err, node) => {
        if (err) return cb(err)
        return cb(null, node ? node.value : null)
      })
    },
    put: hypertrie.put.bind(hypertrie),
    batch: hypertrie.batch.bind(hypertrie),
  }
  return file => rakv(db, prefix + '/' + file)
}

const db = hypertrie(ram)

const feed = hypercore(hypertrieStorage(db, 'feed'), { valueEncoding: 'utf8' })
feed.append('gimme a feed', err => {
  // WORKS :)
  feed.get(0, (err, value) => console.log(err, value))
})

const kv = hypertrie(hypertrieStorage(db, 'key-value'))
kv.put('gimme a key', 'and a value', err => {
  // DOES NOT WORK :(
  kv.get('gimme a key', (err, node) => console.log(err, node))
})