Skip to main content

Transactions on Ganache using Golang

 

Previous Topic: Connect to Ganache using golang

In the pervious topic, we showed how to connect with ganache and retrieving balance for the account using Golang. Now, we are going to transfer some ethers from one account to another account using Golang.

Transfer Fund:

Here we are going to transfer 5 ethers,

From Address : 0x532205E897418D09F2C0253E5A31e666eE87cb1A

To Address : 0x3fCf008C3d40C0af410CD122F00eFA77288A2E13

Each account has balance of 100 eth.



First, we need to find the nonce of the From Address and generate the unsigned raw transaction and using the private key of the From Address sign the unsigned raw transaction. 
To get the Private Key follow the steps:
1. Click the show keys.
2. We will able to see the private key details of the respective address.
After Signing the transaction, we need to broadcast that signed transaction in the network.
 package main

 import (
	"context"
	"fmt"
	"log"
	"math/big"
	"strings"

	"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"
 )

 func main() {

	client, err := ethclient.Dial("http://127.0.0.1:7545")
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("Connection with ganache successful")

	fromAddress := common.HexToAddress("0x532205E897418D09F2C0253E5A31e666eE87cb1A")
	toAddress := common.HexToAddress("0x3fCf008C3d40C0af410CD122F00eFA77288A2E13")

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

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

	// amount of the ethers needs to be transfer in wei
	value := big.NewInt(5000000000000000000)

	var gasLimit = uint64(21000)

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

	// Generating unsinged Raw tx
	var data []byte
	var rawTxObject types.LegacyTx
	rawTxObject.Nonce = nonce
	rawTxObject.Data = data
	rawTxObject.To = &toAddress
	rawTxObject.Gas = gasLimit
	rawTxObject.GasPrice = gasPrice
	rawTxObject.Value = value

	rawTx := types.NewTx(&rawTxObject)

	fmt.Println("Raw Unsigned transaction generated successfully")

	// Signing the Tx
	fromAddressPrivKey := "0x90f4d50d7e43a0c6312bc55754b5c8b888090df72f3407cfb69c0d3965864f90"
	fromAddressPrivKey = strings.TrimPrefix(fromAddressPrivKey, "0x")

	prvKey, err := crypto.HexToECDSA(fromAddressPrivKey)
	if err != nil {
		log.Fatal(err)
	}

	signedTx, err := types.SignTx(rawTx, types.LatestSignerForChainID(chainId), prvKey)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("signing the transaction successfully done")

	// Broadcasting Tx

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

	fmt.Println("broadcasting the transaction successfully done")
	fmt.Println("Tx hash :", signedTx.Hash().Hex())
 }

Output:

Connection with ganache successful
Raw Unsigned transaction generated successfully
signing the transaction successfully done
broadcasting the transaction successfully done
Tx hash : 0xdb09d87c8f99368b7dc88e3973499e1728bc77558beefbe2ebe845e6a5474aa3



Now, The transferring funds from one account to another account is done in Ganache using Golang. You can able to see the block details and transaction details in the Ganache.

Comments

Popular posts from this blog

Crypto ED25519 Signing and Verifying using Golang

The Edwards-curve Digital Signature Algorithm (ECDSA) is used to create a digital signature using an enhancement of the Schnorr signature with Twisted Edwards curves. Overall it is faster that many other digital signature methods, and is strong for security. One example of ECDSA is Ed25519, and which is based on Curve 25519. It generates a 64-byte signature value of (R,s), and has 32-byte values for the public and the private keys. Example : package main import ( "crypto/ed25519" "crypto/rand" "encoding/hex" "fmt" "log" ) func main() { publickey, privatekey, err := ed25519.GenerateKey(rand.Reader) if err != nil { fmt.Println("cannot generate ecdsa keys") log.Fatal(err) } msg := "hello" signedBytes := ed25519.Sign(privatekey, []byte(msg)) fmt.Println("Signed Message :", hex.EncodeToString(signedBytes)) if !ed25519.Verify(publickey, []byte(msg), signedBytes) { fmt.Println("ver...

Crypto RSA Signing and Verification in Golang

  RSA [Rivest-shamir-Adleman] encryption is one of the most widely used algorithms for secure data encryption. Signing and Verification:   RSA works by generating form of key pair of private and public keys. For Signing:  we need to provide some inputs,  A random reader used for generating random bits because if we provide the same input, it doesn't give the same output as last time. Before signing, we need to hash our message. we also need to provide which hash function is used for message hashing. Finally, private key.  For Verifying: we need to provide some inputs,  hash of our message. which hash function is used for message hashing while signing. Finally, public key and signature what we obtained while signing.  Example: package main import ( "crypto" "crypto/rand" "crypto/rsa" "crypto/sha256" "encoding/hex" "fmt" "log" ) func main() { privatekey, publickey := GenerateRsaKeys() message := ...

Smart contract with remix IDE and Ganache

  Previous Topic:  Simple transaction with ganache using Golang In the Previous topic, we learned how to do transaction with ganache using Golang. Now, we will learn what is smart contract and how to write smart contract and how to deploy it and how to call the contract using remix. To learn what is smart contract, we already write a blog about that. Please feel free to take a look.  Ethereum Smart contract . For beginners, use the Remix IDE for learning smart contract and understand how it works. Then we will use Truffle framework. REMIX:  Remix IDE Link Remix will provide a default workspace for developing smart contract. Now you can able to create a new file and start writing contracts, compile it with solidity compiler and deploy that contract and test the contracts. Simple Smart Contract: First create new file called store.sol  and start writing a simple contract. Contract Functionality: Store a record using SetRecord method. View the latest record . [reco...