This project is no longer maintained or actively developed and has been archived. See https://ipld.io for information on recommended usage of IPLD in JavaScript.

SYNOPSIS

This provides an efficent way to build and manipulate IPLD DAGs as JSON. This is accomplished by only producing merkle roots when flushing the DAG. If any object has a "/" property, its value will be replaced with the merkle hash of that value when flushed. This allows you to build object anyway you like.

LEAD MAINTAINER

wanderer

INSTALL

npm install ipld-graph-builder

USAGE

const IPFS = require('ipfs')
const Graph = require('ipld-graph-builder')
const ipfs = new IPFS()

ipfs.on('start', () => {
  const graph = new Graph(ipfs.dag)
  const a = {
    some: {
      thing: 'nested'
    }
  }
  const b = {
    lol: 1
  }

  graph.set(a, 'some/thing/else', b).then(result => {
    // set "patches" together two objects
    console.log(JSON.stringify(result))
    > {
    >  "some": {
    >    "thing": {
    >      "else": {
    >        "/": {
    >          "lol": 1
    >        }
    >      }
    >    }
    >  }
    >}


    // flush replaces the links with merkle links, resulting in a single root hash
    graph.flush(result).then((result) => {
      console.log(result)
      > { '/': 'zdpuAqnGt7k49xSfawetvZXSLm4b1vvkSMnDrk4NFqnCCnW5V' }

      // taverse paths through merkle links given a starting vertex
      graph.get(result, 'some/thing/else').then(result2 => {
        console.log(result2)
        > { lol: 1 }
      })
    })
  })
})

Additonally you can define the encoding of each link by adding the follow options property to un-merklized links. options will be used as the options argument for DAG.put. For Example:

{
  'my-link': {
    '/': {
      'some': 'stuff here'
    },
    'options': {
      format: 'dag-cbor',
      hashAlg: 'sha2-256'
     }
  }
}

API

'./docs/'

TESTS

npm run tests

LICENSE

MPL-2.0