code style | standard

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Block storage

The repo is part of picostack

This is a low-level blockstore for picofeeds that stores consistent chains using a fast access scheme.

• uses abstract-leveldown for storage backends

Discord

Use

$ npm install picorepo levelup memdown

import { Repo } from 'picorepo'
import { Feed } from 'picofeed'

const db = new MemoryLevel('pico', {
  keyEncoding: 'buffer',
  valueEncoding: 'buffer'
})

const repo = new Repo(db)

// Generate an crypto identity consisting of a public and secret key
const { pk, sk } = Feed.signPair()

const feed = new PicoFeed()
feed.append('Alpha', sk)
feed.append('Beta', sk)
feed.append('Gamma', sk)

const numberAccepted = await repo.merge(feed) // => 3 blocks

// Retrieve feed by Author
const alt1 = await repo.loadHead(pk)

// Retrive feed by block-signature
const alt2 = await repo.resolveFeed(feed.first.sig)

Graphviz support

To avoid brain-leakage I've added a tool that renders dot-files to easier inspect which blocks are stored and where their tags are located.

import { writeFileSync } from 'node:fs'
import { inspect } from 'picorepo/dot'

// generate graph as string
const dotString = await inspect(repo)

// dump as file
writeFileSync('repo.dot', dotString)

# use xdot to view it
xdot repo.dot

# or render as png
dot -Gcenter="true" -Gsize="8,8\!" -Gdpi=100 -Kdot -Tpng -O *.dot

Changelog

2.0.0 2023-04-30

• ported to picofeed v4

1.3.1 2022-08-02

• added experimental mode 'allowDetached'

1.3.0 Eons later

• added optional graphviz/dot generator
• added index for chain-id
• added async repo.listFeeds()
• changed repo.writeBlock() to use batch ops.

1.0.0 first release

Contributing

By making a pull request, you agree to release your modifications under the license stated in the next section.

Only changesets by human contributors will be accepted.

License

AGPL-3.0-or-later

2021  Tony Ivanov