Golang code snippet to listen/log BUSD events on Binance Smart Chain

abi.json

[{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"_decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

main.go

package main

import (
	"context"
	"io/ioutil"
	"log"
	"math/big"
	"strings"

	"github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethclient"
)

type LogApproval struct {
	Owner   common.Address `json:"owner"`
	Spender common.Address `json:"spender"`
	Value   *big.Int       `json:"value"`
}

type LogTransfer struct {
	From  common.Address `json:"from"`
	To    common.Address `json:"to"`
	Value *big.Int       `json:"value"`
}

func main() {
	logTransferSig := []byte("Transfer(address,address,uint256)")
	logApprovalSig := []byte("Approval(address,address,uint256)")
	logTransferSigHash := crypto.Keccak256Hash(logTransferSig)
	logApprovalSigHash := crypto.Keccak256Hash(logApprovalSig)

	// use ws for getting events
	// you can get a free trial account at getblock.io for Binance smart chain
	client, err := ethclient.Dial("WSS HERE")
	if err != nil {
		panic(err)
	}

	contractAddress := common.HexToAddress("0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56")
	query := ethereum.FilterQuery{
		Addresses: []common.Address{contractAddress},
	}

	logs := make(chan types.Log)

	sub, err := client.SubscribeFilterLogs(context.Background(), query, logs)
	if err != nil {
		panic(err)
	}

	abiFile, err := ioutil.ReadFile("./abi.json")
	if err != nil {
		panic(err)
	}

	abiDefinition := string(abiFile)
	contractAbi, err := abi.JSON(strings.NewReader(abiDefinition))
	if err != nil {
		panic(err)
	}

	for {
		select {
		case err := <-sub.Err():
			log.Println(err)
		case vLog := <-logs:
			switch vLog.Topics[0].Hex() {
			case logTransferSigHash.Hex():
				var transferEvent LogTransfer
				err := contractAbi.UnpackIntoInterface(&transferEvent, "Transfer", vLog.Data)
				if err != nil {
					panic(err)
				}

				transferEvent.From = common.HexToAddress(vLog.Topics[1].Hex())
				transferEvent.To = common.HexToAddress(vLog.Topics[2].Hex())

				log.Printf("Transfer from %s to %s with %s", transferEvent.From.Hex(), transferEvent.To.Hex(), transferEvent.Value.String())

			case logApprovalSigHash.Hex():
				var approvalEvent LogApproval
				err := contractAbi.UnpackIntoInterface(&approvalEvent, "Approval", vLog.Data)
				if err != nil {
					panic(err)
				}

				approvalEvent.Owner = common.HexToAddress(vLog.Topics[1].Hex())
				approvalEvent.Spender = common.HexToAddress(vLog.Topics[2].Hex())

				log.Printf("Approval from %s to %s with %s", approvalEvent.Owner.Hex(), approvalEvent.Spender.Hex(), approvalEvent.Value.String())
			}
		}
	}
}