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@web3-storage/pail

v0.6.0

Published

DAG based key value store.

Downloads

2,055

Readme

pail

Test JavaScript Style Guide

DAG based key value store. Sharded DAG that minimises traversals and work to build shards.

Install

npm install @web3-storage/pail

Usage

import { put, get, del } from '@web3-storage/pail'
import { ShardBlock } from '@web3-storage/pail/shard'
import { MemoryBlockstore } from '@web3-storage/pail/block'

// Initialize a new bucket
const blocks = new MemoryBlockstore()
const init = await ShardBlock.create() // empty root shard
await blocks.put(init.cid, init.bytes)

// Add a key and value to the bucket
const { root, additions, removals } = await put(blocks, init.cid, 'path/to/data0', dataCID0)

console.log(`new root: ${root}`)

// Process the diff
for (const block of additions) {
  await blocks.put(block.cid, block.bytes)
}
for (const block of removals) {
  await blocks.delete(block.cid)
}

Batch operations

If adding many multiple items to the pail together, it is faster to batch them together.

import { put, get, del } from '@web3-storage/pail'
import { ShardBlock } from '@web3-storage/pail/shard'
import { MemoryBlockstore } from '@web3-storage/pail/block'
import * as Batch from '@web3-storage/pail/batch'

// Initialize a new bucket
const blocks = new MemoryBlockstore()
const init = await ShardBlock.create() // empty root shard
await blocks.put(init.cid, init.bytes)

const batch = await Batch.create(blocks, init.cid)

// items is an array of `{ key: string, value: CID }` - the items to add to the pail
for (const item of items) {
  await batch.put(item.key, item.value)
}

const { root, additions, removals } = await batch.commit()

console.log(`new root: ${root}`)

// Process the diff
for (const block of additions) {
  await blocks.put(block.cid, block.bytes)
}
for (const block of removals) {
  await blocks.delete(block.cid)
}

Contributing

Feel free to join in. All welcome. Open an issue!

License

Dual-licensed under MIT or Apache 2.0