Go encode unsigned transaction, decode transaction, sign and broadcast examples

example.go

package main

import (
	"context"
	"encoding/hex"
	"fmt"
	"log"
	"math/big"

	"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"
	"github.com/ethereum/go-ethereum/rlp"
)

func main() {
	client, err := ethclient.Dial("https://rinkeby.infura.io")
	if err != nil {
		log.Fatal(err)
	}

	value := big.NewInt(100000000000000000) 
	gasLimit := uint64(21000)               
	gasPrice, err := client.SuggestGasPrice(context.Background())
	if err != nil {
		log.Fatal(err)
	}

	fromAddress := common.HexToAddress("0x96216849c49358B10257cb55b28eA603c874b05E")
	nonce, err := client.PendingNonceAt(context.Background(), fromAddress)
	if err != nil {
		log.Fatal(err)
	}

	toAddress := common.HexToAddress("0x4592d8f8d7b001e72cb26a73e4fa1806a51ac79d")
	var data []byte
	tx := types.NewTransaction(nonce, toAddress, value, gasLimit, gasPrice, data)

	chainID, err := client.NetworkID(context.Background())
	if err != nil {
		log.Fatal(err)
	}

	ts := types.Transactions{tx}
	rawTxBytes := ts.GetRlp(0)
	rawTxHex := hex.EncodeToString(rawTxBytes)

	fmt.Printf("Unsigned Tx: %s\n", rawTxHex) 

	// read from unsigned tx bytes
	tx = new(types.Transaction)
	rlp.DecodeBytes(rawTxBytes, &tx)

	privateKey, err := crypto.HexToECDSA("fad9c8855b740a0b7ed4c221dbad0f33a83a49cad6b3fe8d5817ac83d38b6a19")
	if err != nil {
		log.Fatal(err)
	}

	signer := types.NewEIP155Signer(chainID)
	signedTx, err := types.SignTx(tx, signer, privateKey)
	if err != nil {
		log.Fatal(err)
	}

	ts = types.Transactions{tx}
	signedRawTxBytes := ts.GetRlp(0)
	fmt.Printf("Signed Tx: %x\n", signedRawTxBytes)

	err = client.SendTransaction(context.Background(), signedTx)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("Tx Hash: %s\n", signedTx.Hash().Hex())
}

hi Miguel, below code is not working anymore, type.Transaction now doesn't have this method.

	ts = types.Transactions{tx}
	signedRawTxBytes := ts.GetRlp(0)

Can we get support on updated syntax for replacing
ts.GetRlp(0)
??