Get Ethereum address from transaction

address.go

package main

import (
	"context"
	"fmt"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/ethclient"
)

/*
Ethereum doesn't actually include the address of a sender in a transaction. This is derived from the V, R, S values,
hashed, and truncated to get the address. Fortunately this is made easy via a member function (Sender) from the
EIP155Signer structure.
*/

func main() {

	var (
		url  = "http://ropsten:18545"
		txid = "0xc79d64e7f75ddc0042c4de386e2fa7a1f742e5cf68651fa580297b16277f9801"

		tx     *types.Transaction
		sender common.Address
	)

	// connect
	client, err := ethclient.Dial(url)
	if err != nil {
		panic(err)
	}

	// get a tx
	tx, _, err = client.TransactionByHash(context.Background(), common.HexToHash(txid))
	if err != nil {
		panic(err)
	}

	// get the sender
	sender, err = types.NewEIP155Signer(tx.ChainId()).Sender(tx)
	if err != nil {
		panic(err)
	}

	// TX 0xc79d64e7f75ddc0042c4de386e2fa7a1f742e5cf68651fa580297b16277f9801 was sent from 0xcDa3283e436807a798FC2f8B07Be20F2b3B4D155
	fmt.Printf("TX %s was sent from %s\n", txid, sender.String())
}