Acurast DApp

Tools useful in dApp development.

Installation

$ npm install @acurast/dapp

Documentation

AcurastClient

A client that can communicate with the Acurast P2P network.

To create a new instance call it constuctor and provide an Acurast P2P WebSocket server url and an optional connectionTimeoutMillis.

The connection timeout is the number of milliseconds to wait for an initial response from the server. If the server does not respond within the specified time, an error is thrown. If this parameter is omitted, the default value of 15 seconds is used.

constructor(url: string, connectionTimeoutMillis?: number /* default: 15s */)

start

Opens a connection between the client and the server using the dApp's P256 keyPair.

/*
interface KeyPair {
  publicKey: string | Uint8Array
  secretKey: string | Uint8Array
}
*/

start(keyPair: KeyPair): Promise<void>

onMessage

Registers a new listener which will be notified on incoming message.

/*
interface Message {
  sender: Uint8Array
  recipient: Uint8Array
  payload: Uint8Array
}
*/

onMessage(listener: (message: Message) => void | Promise<void>): void

send

Sends a new message with the payload to a peer that identifies with the publicKey.

If payload is not a valid raw bytes value (Uint8Array or a hex string), it will be encoded to UTF-8 bytes before sending.

send(publicKey: string | Uint8Array, payload: string | Uint8Array): Promise<void>

close

Terminates the ongoing connection.

close(): Promise<void>

Usage

Send messages to Acurast Processor

import { AcurastClient, Message } from '@acurast/dapp'

const acurastClient = new AcurastClient('wss://example.com' /* Acurast P2P WebSocket Server */)

await acurastClient.start({
    secretKey: 'f816e59353c58627039fbf5e96747a871244194b9db12095189554e78a6d4a45',
    publicKey: '04ae00462e82af267b42b477493450b04b8ed05e510eca2a40c6f7679b14e364b9d6f9c867a7e72b4880f9632450e5c2c03bd69424f786e10bb77e9bd09e322ef3'
} /* P256 key pair */)

acurastClient.onMessage(async (message: Message) => {
    console.log('Received Message', message)
    await acurastClient.close()
})

await acurastClient.send(
    '028aad55a45e1eba230e38243ee9221d765cdb59fde684bad516bffcc9970f3c15' /* processor's public key */,
    'my message'
)

Example

See the example dApp.