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https://github.com/RangerMauve/hyper-sdk

Make your own hyper apps!
https://github.com/RangerMauve/hyper-sdk

dweb hypercore hypercore-protocol p2p

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Make your own hyper apps!

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# hyper-sdk



A Software Development Kit for the [hypercore-protocol](https://hypercore-protocol.org/)



## Why use this?



Hypercore-protocol and it's ecosystem consists of a bunch of low level building blocks for working with data in distributed applications. Although this modularity makes it easy to mix and match pieces, it adds complexity when it comes to actually building something.



The Hyper SDK combines the lower level pieces of the Hyper stack into high level APIs that you can use across platforms so that you can focus on your application rather than the gritty details of how it works.



## Goals



- High level API

- Cross-platform with same codebase

  - ✔ Node

  - ✔ Electron

  - 🏗️ Web (PRs welcome)



## Installation



Make sure you've set up [Node.js](https://nodejs.org/).



```shell

npm install --save hyper-sdk

# or yarn

```



```js

import * as SDK from "hyper-sdk"

```



## API



### SDK.create()



```JavaScript

const sdk = await SDK.create({

  // Specify the "storage" you want

  // Regular strings will be passed to `random-access-application` to store in your user directory

  // On web this will use `random-access-web` to choose the best storage based on the browser

  // You can specify an absolute or relative path `./example/` to choose where to store data

  // You can specify `false` to not persist data at all and do everything in-memory

  storage: 'hyper-sdk',



  // This controls whether the SDK will automatically start swarming when loading a core via `get`

  // Set this to false if you want to have more fine control over peer discovery

  autoJoin: true,



  // Specify options to pass to the Corestore constructor

  // The storage will get derived from the `storage` parameter

  // https://github.com/hypercore-protocol/corestore/

  corestoreOpts: {},



  // Specify options to pass to the hyperswarm constructor

  // The keypair will get derived automatically from the corestore

  // https://github.com/hyperswarm/hyperswarm

  swarmOpts: {},

})

```



### sdk.publicKey



The public key used for identifying this peer in the hyperswarm network.



This is a 32 byte buffer which can be use in conjunction with `sdk.joinPeer()` to connect two peers directly together.



### sdk.connections



The list of active connections to other peers, taken from hyperswarm.



### sdk.peers



The list of active peers.



Each peer has a `publicKey`, and list of `topics`



You can find more docs in the [hyperswarm](https://github.com/hyperswarm/hyperswarm#peerinfo-api) repo.



### sdk.cores



List of active Hypercores.



### sdk.on('peer-add', peerInfo) / sdk.on('peer-remove', peerInfo)



You can listen on when a peer gets connected or disconnected with this event.



You can find more docs in the [hyperswarm](https://github.com/hyperswarm/hyperswarm#peerinfo-api) repo.



```JavaScript

sdk.on('peer-add', (peerInfo) => {

  console.log('Connected to', peerInfo.publicKey, 'on', peerInfo.topics)

})

sdk.on('peer-add', (peerInfo) => {

  console.log('Disconnected from')

})

```



### sdk.get()



You can initialize a [Hypercore](https://github.com/hypercore-protocol/hypercore) instance by passing in a key, a name to derive a key from, or a URL containing either a key or a DNS name.



You can also pass additional options for whether the hypercore should be replicated as sparse or not.



Unlike corestore, you may not initialize a hypercore from a `null` key since everything must be derivable or loadable.



Unless `autoJoin` is set to `false`, the peer discovery will be automatically started for the core.



```JavaScript

// Derive a key from a "name"

const core = await sdk.get('example name')



// Resolve DNS to a hypercore

const core = await sdk.get('hyper://example.mauve.moe')



// Buffer key, 32 bytes of 0's

const core = await sdk.get(b4a.alloc(32, 0))



// Hex key, equivalent to 32 bytes of zeros

const core = await sdk.get('hyper://0000000000000000000000000000000000000000000000000000000000000000')



// z32 encoded, equivalent to 32 bytes of zeros

const core = await sdk.get('hyper://yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy')



// Disable sparse mode in order to download everything from peers

const core = await sdk.get('example', {sparse: false})



// Don't auto-join the swarm for the core on init

const core = await sdk.get('example', {autoJoin: false})

```



### sdk.getDrive()



You can initialize a [Hyperdrive](https://github.com/holepunchto/hyperdrive-next) instance by passing in the same arguments as in `sdk.get()`.



In addition to the usual `hyperdrive` properties, there's a new `url` property to get the `hyper://` URL for the drive to used elsewhere.



Note that the drives's metadata DB's discovery key will be used for replicating if `autoJoin` is `true`.



Hyperdrive is mostly useful for storing and loading files since it splits the metadata representing the file systema and the blob storage into separate cores.



```JavaScript

const drive = await sdk.getDrive('hyper://blob.mauve.moe')

for(const path of drive.readdir('/')) {

  const stat = drive.stat(path)

}

```



### sdk.getBee()



You can initialize a [Hyperbee](https://github.com/holepunchto/hyperbee) instance by passing the same arguments as in `sdk.get()`.



In addition to the usual `hyperbee` properties, there's a new `url` property to get the `hyper://` URL for the bee to used elsewhere.



Additionally, you should pass in a `keyEncoding` and a `valueEncoding` in order to control the encoding for data that's being written.



Hyperbee is best used when you want to create database indexes.



For an out of the box database with a proper query language, check out [HyperbeeDeeBee](https://github.com/RangerMauve/hyperbeedeebee/).



```JavaScript

const db = await sdk.getBee('example db')



const db = await sdk.getBee('example db', {keyEncoding: 'utf8', valueEncoding: 'json')

await db.put('hello', 'world')



for(const entry of db.createReadStream()) {

  console.log(entry)

}

```



### sdk.resolveDNSToKey()



You can manually resolve DNS addresses to hypercore keys on domains using the DNS Link spec with this method.



However, it's not mandatory to use DNS since `sdk.get()` will automatically detect and perform resolutions of DNS for `hyper://` URLs.



```JavaScript

const key = await sdk.resolveDNSToKey('example.mauve.moe')

```



### sdk.namespace()



Get back a namespaced [Corestore](https://github.com/hypercore-protocol/corestore/) instance which can be passed to things like Hyperdrive.



Note that cores initialized with a namespaced corestore will not be auto-joined and you will need to call `sdk.join(core.discoveryKey)` on said cores.



```JavaScript

import Hypderdrive from "hyperdrive"



const drive = new Hyperdrive(sdk.namespace('example'))



// Wait for the drive to initiailize

await drive.ready()



// Manually trigger peer lookup for this drive

sdk.join(drive.publicKey)

```



### sdk.join() / sdk.leave()



You can manually trigger peer discovery of hypercores as well as stop peer discovery.

This can be done by using the `discoveryKey` of a hypercore, or any 32 byte buffer.



As well, you can use string names for topics in order to discover peers based on a human readable string.

When using string topics, they are converted to 32 byte buffers using the [Hypercore Crypto namespace algorithm](https://github.com/mafintosh/hypercore-crypto#list--cryptonamespacename-count).



```JavaScript

const core = await sdk.get('example', {autoJoin: false})



// Start finding peers without advertising

sdk.join(core.discoveryKey, {server: false})



// Listen on a human readable topic

sdk.join("cool cat videos")



sdk.leave(core.discoveryKey)

sdk.leave("cool cat videos")

```



### sdk.joinPeer() / sdk.leavePeer()



```JavaScript

const sdk1 = await SDK.create({persist: false})

const sdk2 = await SDK.create({persist: false})



sdk1.joinPeer(sdk2.publicKey)

```



### sdk.close()



This will gracefully close connections, remove advertisements from the DHT, and close any open file handles.



Make sure you invoke this to keep the network fast and to avoid data corruption!