dirkmc/js-ipfs-block-service

JavaScript Implementation of Block and BlockService

IPFS Block Service

IPFS implementation of the BlockService and Block data structure in JavaScript.

BlockService - A BlockService is a content-addressable store for blocks, providing an API for adding, deleting, and retrieving blocks. A BlockService is backed by an IPFS Repo as its datastore for blocks, and uses Bitswap to fetch blocks from the network.

┌───────────────────┐
│    BlockService   │
└───────────────────┘
     ┌─────┴─────┐
     ▼           ▼
┌─────────┐ ┌───────┐
│IPFS Repo│ |Bitswap│
└─────────┘ └───────┘

Lead Maintainer

Volker Mische

Table of Contents

• Install
  • npm
• Usage
  • Node.js
  • Example
  • Browser: Browserify, Webpack, other bundlers
  • Browser: <script> Tag
• API
• Contribute
• License

Install

npm

> npm install ipfs-block-service

Usage

Node.js

const BlockService = require('ipfs-block-service')

Example

const BlockService = require('ipfs-block-service')
const Block = require('ipfs-block')
const multihashing = require('multihashing-async')
const IPFSRepo = require('ipfs-repo')  // storage repo

// setup a repo
const repo = new IPFSRepo('example')

// create a block
const data = new Buffer('hello world')
multihashing(data, 'sha2-256', (err, multihash) => {
  if (err) {
    throw err
  }

  const cid = new CID(multihash)
  const block = new Block(data, cid)

  // create a service
  const bs = new BlockService(repo)

  // add the block, then retrieve it
  bs.put(block, (err) => {
    if (err) {
      throw err
    }
    bs.get(cid, (err, b) => {
      if (err) {
        throw err
      }
      console.log(block.data.toString() === b.data.toString())
      // => true
    })
  })
})

Browser: Browserify, Webpack, other bundlers

var BlockService = require('ipfs-block-service')

Browser: <script> Tag

Loading this module through a script tag will make the IpfsBlockService obj available in the global namespace.

<script src="https://unpkg.com/ipfs-block-service/dist/index.min.js"></script>
<!-- OR -->
<script src="https://unpkg.com/ipfs-block-service/dist/index.js"></script>

API

See https://ipfs.github.io/js-ipfs-block-service

Contribute

Feel free to join in. All welcome. Open an issue!

This repository falls under the IPFS Code of Conduct.

License

MIT