hyperlog-data

save/load a hyperlog to/from a stream of bytes

example

save

save a hyperlog to a stream of bytes for external storage:

`` js
var hyperlog = require('hyperlog')
var memdb = require('memdb')
var hdata = require('hyperlog-data')
var fs = require('fs')

var log = hyperlog(memdb())
log.createReadStream({ live: true })
.pipe(hdata.save())
.pipe(fs.createWriteStream('/tmp/log.data'))

var data = {
A: { links: [], data: 'hello' },
B: { links: ['A'], data: 'world' },
C: { links: ['A'], data: 'zzz' },
D: { links: ['B','C'], data: 'zing' },
}
var keys = Object.keys(data).sort()
var nodes = {}
;(function next (prev) {
if (keys.length === 0) return
var key = keys.shift()
var links = data[key].links.map(function (link) { return nodes[link] })
log.add(links, data[key].data, function (err, node) {
if (err) return console.error(err)
nodes[key] = node.key
next()
})
})(null)
`

load

populate a hyperlog with previously exported data from a stream of bytes:

` js
var hyperlog = require('hyperlog')
var memdb = require('memdb')
var hdata = require('hyperlog-data')
var fs = require('fs')

var log = hyperlog(memdb())
fs.createReadStream('/tmp/log.data')
.pipe(hdata.load(log))

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

api

` js
var hdata = require('hyperlog-data')
`

var stream = hdata.save()

Return a transform object stream that reads rows from a hyperlog's
createReadStream() and outputs bytes.

var stream = hdata.load(log, cb)

Return a readable stream that reads bytes from an exported hyperlog and
populates log with the data. When the log is finished being written to,
cb(err) fires.

install

`
npm install hyperlog-data
``

license

BSD