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Readme

Decentraland Catalyst Client

Welcome to the Catalyst Client library. This client can be used to interact with Decentraland's Catalyst servers. You can both fetch data, or deploy new entities to the server you specify.

Installation

npm install dcl-catalyst-client

Implementations

The examples in this document illustrate the implementation of common workflows using the second version of catalyst-client.

Connect to random Catalyst

The following section outlines the steps to successfully connect to a random catalyst when there is no need to communicate with any particular node.

import { connectedToRandomCatalyst } from 'dcl-catalyst-client'
import { getCatalystServersFromCache } from './../dist/contracts-snapshots'
import { createFetchComponent } from './../dist/client/utils/fetcher'

// Connect to a catalyst randomly choosen from the catalyst-client snapshot
const fetcher = createFetchComponent()
const nodes = getCatalystServersFromCache('mainnet')
const catalyst = await connectedToRandomCatalyst(nodes, { fetcher })

if (!catalyst) {
  console.log('No catalyst node is available right now')
  return
}

const catalystInfo = await catalyst.fetchAbout()
const contentClient = await catalyst.getContentClient()
const lambdasClient = await catalyst.getLambdasClient()

Deploy an entity

The following section outlines the steps to deploy an entity to the Decentraland network.

import { Authenticator } from '@dcl/crypto'
import { createCatalystClient } from 'dcl-catalyst-client'
import { createFetchComponent } from 'dcl-catalyst-client/dist/client/utils/fetcher'
import * as EthCrypto from 'eth-crypto'
import { EntityType } from '@dcl/schemas'
import { PROFILE_METADATA, PROFILE_POINTERS } from './data/inputs'

async function resolveClient() {
  // Build the client, Node is harcoded for simplicity
  const fetcher = createFetchComponent()
  const catalyst = await createCatalystClient({ url: 'https://peer-ec2.decentraland.org', fetcher })

  return await catalyst.getContentClient()
}

const identity = { privateKey: 'privatekey', address: '0xfbf2b0392d969db533189b596708ba9ba7f4e3cd' }

const content = await resolveClient()

const { entityId, files } = await content.buildEntity({
  type: EntityType.PROFILE,
  pointers: PROFILE_POINTERS,
  metadata: PROFILE_METADATA
})

// This is up to you. You will need to figure out how to make the owner of the pointer sign the entity id
const messageHash = Authenticator.createEthereumMessageHash(entityId)
const signature = EthCrypto.sign(identity.privateKey, Buffer.from(messageHash).toString('hex'))

// You can then create a simple auth chain like this, or a more complex one.
const authChain = Authenticator.createSimpleAuthChain(entityId, identity.address, signature)
const deployData = { entityId, files, authChain }

// Deploy the actual entity
await content.deploy(deployData)