hyperswarm

Create a p2p webrtc swarm around a hyperlog.

background

This is a fork of substack/swarmlog that changes the API a bit. The key difference is that hyperswarm consumes a hyperlog rather than producing it. This makes it easy to supply your own non-standard hyperlog implementation conforming to its API, like noffle/ipfs-hyperlog.

example

Create a hyperlog publisher that will write a new message every second:

publish.js:

var hyperlog = require('hyperlog')
var hyperswarm = require('hyperswarm')
var memdb = require('memdb')

var log = hyperlog(memdb(), {
  valueEncoding: 'json'
})

var swarm = hyperswarm(log, {
  topic: 'example',
  hubs: [ 'https://signalhub.mafintosh.com' ]
})

var times = 0
setInterval(function () {
  log.append({ time: Date.now(), msg: 'HELLO!x' + times })
  times++
}, 1000)

and a follower that will consume the log:

var hyperlog = require('hyperlog')
var hyperswarm = require('hyperswarm')
var memdb = require('memdb')

var log = hyperlog(memdb(), {
  valueEncoding: 'json'
})

var swarm = hyperswarm(log, {
  topic: 'example',
  hubs: [ 'https://signalhub.mafintosh.com' ]
})

log.createReadStream({ live: true })
  .on('data', function (data) {
    console.log('RECEIVED', data)
  })

api

var hyperswarm = require('hyperswarm')

var swarm = hyperswarm(log, opts)

Create a hyperswarm instance swarm from a hyperlog log and options:

opts.topic - a string indicating some topic to use to look for common peers
opts.hubs - array of signalhub hubs to use
opts.peerStream(peer) - optional function that should return the stream to
use for a peer swarm connection. Use this if you want to multiplex some other
protocols on the same swarm alongside the hyperlog replication.

Optionally provide a wrtc instance as opts.wrtc to create a hyperswarm in Node.

swarm.hub

The underlying signalhub instance.

p2p

Currently the swarm relies on signalhub to assist in the webrtc swarm setup, but ideally in the future this could be replaced or augmented with a webrtc DHT.