auctionHouseListingParser.js

import { serialize, deserializeUnchecked } from 'borsh';
import { Connection, PublicKey, Struct } from '@solana/web3.js';
const Base58 = require("base-58")
import * as beet from '@metaplex-foundation/beet';

const url = "rpc url";
const solanaConnection = new Connection(url,'confirmed');


// metaplex source: https://github.com/metaplex-foundation/metaplex-program-library/blob/master/auction-house/js/src/generated/instructions/executeSale.ts#L17
class Primitive {
  tradeStateBump: number;
  freeTradeStateBump: number;
  programAsSignerBump: number;
  buyerPrice: beet.bignum;
  tokenSize: beet.bignum;
  constructor(args: {
    tradeStateBump: number;
    freeTradeStateBump: number;
    programAsSignerBump: number;
    buyerPrice: beet.bignum;
    tokenSize: beet.bignum;
  }) {
    this.tradeStateBump = args.tradeStateBump;
    this.freeTradeStateBump = args.freeTradeStateBump
    this.programAsSignerBump = args.programAsSignerBump
    this.buyerPrice = args.buyerPrice
    this.tokenSize = args.tokenSize
  }
}

const value = new Primitive({
  tradeStateBump: 255,
  freeTradeStateBump: 254,
  programAsSignerBump: 255,
  buyerPrice: 35000000000,
  tokenSize: 1,
})

const schema = new Map([[Primitive,{
  kind: 'struct',
  fields: [
    ['instructionDiscriminator', ['u8', 8]],
    ['tradeStateBump', 'u8'],
    ['freeTradeStateBump', 'u8'],
    ['programAsSignerBump', 'u8'],
    ['buyerPrice', 'u64'],
    ['tokenSize', 'u64'],
  ]
}]]);

const parser = async () => {
  const txn = await solanaConnection.getTransaction("4Jsmb6WeDzhLAaRF494CfbFLh6Vg2TCSfHKMWN18ueyaVzdQjf69GX4SDDdGFowey8g81DgFv7inQrTEyJiG49op");
  const test = Buffer.from(Base58.decode(txn?.transaction.message.instructions[0].data))
  const data = deserializeUnchecked(schema, Primitive, test)
  console.log("price:", data.buyerPrice.toString())
}
 parser()