Data decoding

Decoding events:

import {run} from '@subsquid/batch-processor'
import * as depositsAbi from './abi/deposits'

run(dataSource, new TypeormDatabase(), async (ctx) => {
  for (let c of ctx.blocks) {
    for (let log of c.logs) {
      if (log.address === CONTRACT_ADDRESS &&
          log.topics[0] == depositsAbi.events.Deposit.topic) {

        // type-safe decoding of the Deposit event data
        const amt = depositsAbi.events.Deposit.decode(log).wad
      }
    }
  }
})

Similar to events, transaction access is provided by the functions object for each contract method defined in the ABI. Generated event objects also expose is(log), topicSelection(indexedArgs), and the topic constant. topicSelection() returns a topic0 through topic3 filter object that can be used as the where option of addLog():

source.addLog({
  where: depositsAbi.events.Deposit.topicSelection({owner: [OWNER]}),
})

Generated function objects expose sighash, is(transaction), encode(args), decode(input), and decodeResult(output). Overloaded ABI names receive a signature-based suffix so every generated export remains unique.

Generating utility modules

Direct RPC queries

⌘I

Overview

Pipes SDK

Squid SDK

Alternative clients