Hyperfeed

Hyperfeed is a self-archiving P2P live feed. You can convert any RSS/ATOM/RDF feed to a P2P live update publishing network.

• Self-archiving: All published items will be archived. If the feed is updated and doesn't contain old items, Hyperfeed still preserve them.
• P2P: Feed items are distributed in a P2P manner. Save bandwidth and support offline mode.
• Live: No need to constantly scrap a RSS feed, Updates will be pushed to you.

npm install hyperfeed

Synopsis

Create a hyperfeed from a RSS feed:

const request = require('request')
const hyperfeed = require('hyperfeed')
const swarm = require('hyperdiscovery')

request('https://medium.com/feed/google-developers', (err, resp, body) => {
  hyperfeed().createFeed.update(body).then(feed => {
    swarm(feed) // share it through a p2p network
    console.log(feed.key.toString('hex')) // this will be the key for discovering
  })
})

Now you can replicate the hyperfeed through a p2p network:

const Hyperfeed = require('hyperfeed')
const swarm = require('hyperdiscovery')

var feed = hyperfeed().createFeed(<KEY FROM ABOVE>, {own: false})
swarm(feed) // load the feed from the p2p network
feed.list((err, entries) => {
  console.log(entries) // all entries in the feed (include history entries)
})

// open a read stream, listening feed updates
var rs = feed.list({live: true})
rs.on('data', entry => {
  // whenever a new entry is available, you will automatically receive it without any polling

  // you can load the feed item with feed.load
  feed.load(entry).then(item => {
    // the actual feed item.
  })
})

API

var hf = hyperfeed([drive])

Create a new Hyperfeed instance. If you want to reuse an existing hyperdrive, pass it as argument.

var feed = hf.createFeed([key], [opts])

Create a new Hyperfeed instance. If you want to download from an existing feed, pass the feed's key as the first argument. Options include

{
  own: boolean, // REQUIRED if `key` is not null. Set to true if this is a hyperfeed you created (in the same storage) before.
  file: function (name) { return raf(name) }, // set to a raf if you want to save items to filesystem
  scrap: false      // if set to true, hyperfeed will also save the page each feed item pointed to.
}

where raf is

const raf = require('random-access-file')

feed.key

The 32-bit public key of the feed.

var promise = feed.update(rssXML)

Parse and save new items from a Feed XML. We support RSS, ATOM, and RDF feeds.

feed.meta

Returns the metadata of the feed.

var promise = feed.setMeta(obj)

Explicitly set the metadata

var stream = feed.list([opts], [cb])

Returns a readable stream of all entries in the archive, include history

{
  offset: 0 // start streaming from this offset (default: 0)
  live: false // keep the stream open as new updates arrive (default: false)
  withScrapped: false // also return scrapped data (default: false)
}

You can collect the results of the stream with cb(err, entries).

Entries are metadata of feed items. If you want to get the feed item itself, call feed.load(entry)

var promise = feed.load(entry, [opts])

Returns a Feed item from given entry.

if you want to load scrapped data and it's not a JSON. set opts to {raw: true}

entry is an object returned by #list()

var promise = feed.save(item, [targetEntry], [scrappedData])

Save a new feed item into hyperfeed. Check https://github.com/jpmonette/feed for item detail.

If you want to specify entry metadata (e.g. ctime, name...), pass a targetEntry.

If you already have scrapped data from item.link, you can pass it to scrappedData to avoid redundant requests.

var promise = feed.xml(count)

Returns a RSS-2.0 Feed in XML format containing latest count items.

Related Modules

• hyperfeed-server: host a hyperfeed from cli
• hyperfeed-merge: merge multiple hyperfeed into one

License

The MIT License