SubstrateEvent

Interface containing the required information about the emitted Substrate event

TheSubstrateEvent object is passed as the second argument for each event handler and contains all the essential information about the event being processed by Hydra Indexer. Let us take a closer look at the interface.

import BN from 'bn.js';

export interface EventParam {
  type: string
  name: string
  value: AnyJsonField
}

export interface ExtrinsicArg {
  type: string
  name: string
  value: AnyJsonField
}

export interface SubstrateExtrinsic {
  method: string
  section: string
  versionInfo?: string
  meta?: AnyJson
  era?: AnyJson
  signer: string
  args: ExtrinsicArg[]
  signature?: string
  hash?: string
  tip: BN
}

export interface SubstrateEvent {
  name: string
  method: string
  section?: string
  params: Array<EventParam>
  index: number
  id: string
  blockNumber: number
  extrinsic?: SubstrateExtrinsic
}

As can be seen above, the SubstrareEvent also provides a reference to the extrinsic that has emitted the event.