ipfs-core/src/components/name/pubsub/utils.js

JavaScript implementation of the IPFS specification

import { IpnsPubsubDatastore } from '../../../ipns/routing/pubsub-datastore.js'
import errcode from 'err-code'

/**
 * @typedef {import('../../../types').ExperimentalOptions} ExperimentalOptions
 * @property {boolean} [ipnsPubsub] - Enable pub-sub on IPNS. (Default: `false`)
 */

/**
 * Get pubsub from IPNS routing
 *
 * @param {import('../../ipns').IPNSAPI} ipns
 * @param {ExperimentalOptions} [options]
 */
export function getPubsubRouting (ipns, options) {
  if (!ipns || !(options && options.ipnsPubsub)) {
    throw errcode(new Error('IPNS pubsub subsystem is not enabled'), 'ERR_IPNS_PUBSUB_NOT_ENABLED')
  }

  // Only one store and it is pubsub
  if (ipns.routing instanceof IpnsPubsubDatastore) {
    return ipns.routing
  }

  // Find in tiered
  const pubsub = (ipns.routing.stores || []).find(s => s instanceof IpnsPubsubDatastore)

  if (!pubsub) {
    throw errcode(new Error('IPNS pubsub datastore not found'), 'ERR_PUBSUB_DATASTORE_NOT_FOUND')
  }

  return pubsub
}