subgraph

subgraph

Content addressable graph where every node has at most a single link to another node

npm install subgraph

Usage

var subgraph = require('subgraph')
var sg = subgraph(levelupInstance)

var ws = sg.createAppendStream()

ws.write('hello')
ws.write('world')

ws.end(function () {
  var rs = sg.createReadStream(ws.key)

  rs.on('data', function (node) {
    console.log(node) // first {value: 'world'} then {value: 'hello'}
  })
})

API

var sg = subgraph(levelupInstance)

Create a new subgraph instance

var ws = sg.createAppendStream([link])

Create an append stream. The values you write to it will be linked together. When the stream emits finish it will have a .key property that contains the latest link and a .length property that contains the number of nodes written

Optionally you can provide a link in the constructor for the first node to append to.

var rs = sg.createReadStream(link)

Create a read stream from a link. Will read out values in reverse order of writes to the append stream.

var ws = sg.createWriteStream(link)

Create a write stream from a link. Will verify that the values written matches the link when hashed.

sg.add(link, value, [cb])

Shorthand for only adding a single value

sg.get(link, cb)

Shorthand for getting a single value

sg.resumable(link, cb)

If the write stream is destroyed/ended before all values are written to it will be resumable. This method returns the latest missing link of a write stream.

License

MIT