How to connect to Ethereum network using Go

April 12, 2022

Overview

Go helps you make faster scalable backends and this guide will show you how to connect your backend to Ethereum (and make it even faster, more reliable, and globally accessible, all thanks to QuickNode’s global infrastructure). 

What is GoLang?
Go is an open-source programming language launched by Google engineers in 2009. It was partially derived from C, adopting C’s syntax and features but with memory safety, garbage collection, structural typing, and concurrency. Go features super efficient concurrency mechanisms that take full advantage of modern multi-core hardware along with distributed networked infrastructures.

Go’s key features:
  1. Statically typed and fast compiled, produces binary executables - which are FAST
  2. Cross-platform with mobile support runs on most platforms and has native libraries 
  3. Strong support for concurrency with built-in primitives. Uses Goroutines which consume very little memory, featuring fast startup time, and can run multiple threads
  4. Simple and minimalist (full reference is only 50 pages)
  5. Strong standard library with lots of addons
  6. Pointers and parameters by reference - don’t you miss those?

Connecting to ethereum with Geth aka go-ethereum:
go-ethereum is the official implementation of Ethereum in Go, (also known as Geth), the ethclient package can be used for Ethereum RPC API.

Prerequisites
  • Go version 1.13 or above installed
  • A text editor
  • CLI

How to install Go and basic error handling

As mentioned, if we want to use the go-ethereum client, we will need to check if Go is installed on your system:

how to install go and basic error handling

Copy
$ go version

If Go is not installed, follow the official installation guide for your specific OS.

Make sure you have the gcc compiler installed as well.
For Ubuntu - use apt-get install build-essentials
For Windows - use https://jmeubank.github.io/tdm-gcc/download/
For Mac - using homebrew

how to install go and basic error handling

Copy
$ brew install gcc
another faster option is getting XCode Command Line Tools using 

how to install go and basic error handling

Copy
$ xcode-select --install

If you’re not familiar with Go, we recommend running their interactive tutorial that will cover the basic syntax, methods, and concurrency handling. There are some exercises you can run all without having to leave your environment. Simply type the command below into your command line / terminal to run the tutorial locally:

how to install go and basic error handling

Copy
$ go get golang.org/x/tour
Now type:

how to install go and basic error handling

Copy
$ tour

Booting our Ethereum node

Any Ethereum node may be used for the purpose of this guide - Geth or OpenEthereum (fka Parity). For the sake of simplicity, let’s grab a free endpoint from QuickNode, which makes everything much easier with less overhead. After you've created your free Ethereum node, copy your HTTP Provider endpoint, as you will need it later. QuickNode makes booting, running, and maintaining your own node a painless experience. Developers no longer need to wait days for full sync, sacrifice terabytes of storage space, and worry about security and maintenance.

A screenshot of the Getting Started page on QuickNode with HTTP and WSS links for the Ethereum endpoint


You'll need this later, so copy it and save it.

Connecting via Go

The following will show you how to initialize your Go project, connect to the Ethereum network and get the latest block number, quickly, easily, and headache-free, provided you have installed the latest version of Go on your environment. 

1. Create a file called quiknode.go 

connecting via go

Copy
package main

import (
	"fmt"
	"log"

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

func main() {

	client, err := ethclient.Dial("ADD_YOUR_ETHEREUM_NODE_URL")

	if err != nil {
		log.Fatalf("Oops! There was a problem", err)
	} else {
		fmt.Println("Success! you are connected to the Ethereum Network")
	}
}

Replace `ADD_YOUR_ETHEREUM_NODE_URL` with the provider endpoint you saved earlier.

2. Create a module to track dependencies. If you’re not familiar with go, this is an essential step in setting up your project’s dependencies. With Go it’s quite easy

Simply type:

connecting via go

Copy
$ go mod init quiknode

This will ensure the ethclient that was included in your code is downloaded from GitHub and installed locally. It happens automatically and the latest version should be pulled into your environment along with built-in Go modules. 

3. Run your module with 

connecting via go

Copy
$ Go run quiknode.go

If everything goes well, you will see the following message:


That was easy! You are now running your own node that is connected and synced. Next, check if your node is working and pull some information from the blockchain.
  
4. Modify your code to obtain additional information from the ETH blockchain:
 

connecting via go

Copy
package main

import (
    "context"
    "fmt"
    "log"

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

func main() {
    client, err := ethclient.Dial("ADD_YOUR_ETHEREUM_NODE_URL")
   
    if err != nil {
		log.Fatalf("Oops! There was a problem", err)
    } 
    else {
		fmt.Println("Sucess! you are connected to the Ethereum Network")
	}
	header, err := client.HeaderByNumber(context.Background(), nil)
	if err != nil{
		log.Fatal(err)
	} 
	else {
		fmt.Println(header.Number.String())
	}
}

 A quick explanation of the code above:
Lines 1-9: Declaring the main package and adding dependencies necessary to connect to the blockchain.
Line 11: Invoking the main function.
Line 12: Setting up our client and connecting it to an Ethereum node hosted by QuickNode.
Line 14: Checking for connection errors.
Line 18: Displaying a message on the successful connection.
Line 20: Sending a request to our node to obtain the latest block number.
Lines 21-26: Checking for request error and outputting a success message if no errors, converting the hash number to a string and displaying it.

Don’t forget to replace `ADD_YOUR_ETHEREUM_NODE_URL` with the http endpoint address for your own node. 

Upon successful execution, you will see a similar message:


That’s it! You can now use your own QuickNode and build the next awesome dApp using Go.

Conclusion

This guide showed you how to connect to the Ethereum network using Go and a free QuikNode Ethereum Node. We encourage you to learn more about the various RPC methods of ethclient  in their docs and explore the go-ethereum's GitHub for other modules.

Also, learn how to spin up your own go-ethereum/geth node in our tutorial on 'How to install and run a Geth node.'

Subscribe to our newsletter for more articles and QuikNode guides on Ethereum. Share your feedback on Twitter, and ask us anything on Discord

Related articles 54

How to Send a Transaction On Solana Using JavaScript
Apr 13, 2022

Hello reader! Today is an exhilarating day because we are going on an expedition to the Solana Blockchain. Solana is an up-and-coming blockchain seeking to improve upon the current ecosystem's solutions to the complex problem of providing a secure, scalable, decentralized...

Continue reading
How to do a non-custodial transaction with QuickNode
Apr 12, 2022

Private keys are one of the most sensitive pieces of data when it comes to cryptography and the blockchain. However, there has always been debate/confusion about choosing between custodial wallets (where the wallet provider has custody of the user’s private key) and...

Continue reading
How to connect to Ethereum using .NET (Nethereum)
Apr 12, 2022

Dotnet or .NET is very popular for the development of desktop applications, most Windows desktop applications are built using .NET, and it also contributes largely to web application’s tech stack. In this guide, let’s see how we can connect to Ethereum using .NET and

Continue reading
How to Set Up a Near Project from Scratch
Jan 27, 2022

In this tutorial we will look at how we can setup a basic NEAR project from scratch, installing and configuring dependencies and customizing the project to work well with AssemblyScript.We will first start by initializing our project with a package.json file using...

Continue reading
Como crear y lanzar un ERC-721 (NFT)
Dec 29, 2021

Coleccionables digitales que son compatibles con ERC-721 se han vuelto muy populares desde el lanzamiento de Cryptokitties y han ganado adopción masiva en los últimos meses. Esta guía cubrirá la parte de creación y lanzamiento...

Continue reading
How to connect to Ethereum network using Java / Web3j
Apr 12, 2022

We can say that Java is one of the most versatile languages out there, and it continues to be relevant in today's time. Java is so popular because of its massive user base and use cases. In this guide/tutorial, we'll learn how to connect to the Ethereum Blockchain network...

Continue reading
How to integrate IPFS with Ethereum
Apr 12, 2022

It can be costly to store massive files on a blockchain mainnet, and this is where decentralized file storing systems like IPFS can come in handy. Sometimes, NFTs use IPFS as well. In this guide, we’ll cover how we can integrate IPFS with...

Continue reading
How to Connect to the Ethereum Network using Ruby
Jun 13, 2022

The Ruby programming language has a huge fanbase. Ruby was developed by its creator with an intention to invent a language developers can enjoy learning and using. Ruby has been largely accepted by developers all around the world since its launch, in fact, the biggest...

Continue reading
How to connect to Ethereum network with ethers.js
Apr 12, 2022

When someone thinks of developing a dApp the first tool that comes to their mind is web3.js which is pretty common because of its popularity in the community and wide use cases, dApp development has been consistently growing and there are a lot of developers who want to...

Continue reading
How to Mint an NFT on Solana
Apr 12, 2022

Updated at: April 10, 2022Welcome to another QuickNode guide on Solana - the up-and-coming blockchain that seeks to solve the scalability issues of Ethereum. We will be walking through step-by-step how to create an NFT on Solana. NFT, short for Non Fungible Token,...

Continue reading
The Web3 Developer Stack
Apr 12, 2022

A developer stack is a bag of technologies a developer possesses. For example, MEAN (MongoDB, Express.js, AngularJS/Angular, and Node.js) and MERN (MongoDB, Express.js, React, and Node.js) are common web developer stacks. Similarly, today we will learn more about the web3...

Continue reading
How to deploy a smart contract with Brownie
Apr 12, 2022

Python is one of the most versatile programming languages; from researchers running their test models to developers using it in heavy production environments, it has use cases in every possible technical field. In today's guide, we will learn about Brownie, a Python-based...

Continue reading
How to Get All Tokens Held by a Wallet in Solana
Jun 24, 2022

Hello readers! To kick off Solana Summer and the current whitelist meta, we thought it would be helpful to dig into all of the token accounts you and your users have using the getParsedProgramAccounts method. This tool is convenient for querying different...

Continue reading
Introduction to Scaffold-ETH 🏗
Dec 29, 2021

Developing applications involves juggling several moving pieces like front-ends, back-ends, and databases. But developing a decentralized application on a blockchain adds a few more elements like smart contracts and nodes that allow you to connect to the...

Continue reading
Como crear un NFT en SOLANA
Dec 29, 2021

¡Hola querido lector! Bienvenidos a una nueva guía de Solana.Solana es una blockchain que promete mucho a la hora de intentar resolver los problemas de escalabilidad que podemos apreciar en otras blockchains, como Ethereum por...

Continue reading
How to Get Transaction Logs on Solana
Jun 28, 2022

Ever need to pull all the transactions associated with a Wallet? Want to see all of the mint transactions associated with a Candy Machine? Or maybe see transaction history of an NFT? Solana's getSignaturesForAddress method is a versatile tool that makes...

Continue reading
How to Send an EIP-1559 Transaction
Apr 12, 2022

While Ethereum has been trying to scale, it has encountered some gas price issues. Many layer 2 solutions and sidechains sprang into existence to solve this problem, but Ethereum is the main chain, and at some point, it has to be improved. EIP-1559 was introduced to...

Continue reading
How to Create an Address in Solana using JavaScript
Apr 12, 2022

Hello reader! Welcome to QuickNode's first Solana guide. Solana is an up-and-coming blockchain that seeks to solve the scalability issues that Ethereum has been handling. You will walk through step-by-step how to create a Solana address using the @solana/web3.js...

Continue reading
How to create your own DAO with Aragon
Apr 12, 2022

Blockchain provides us with the power of decentralization. Decentralization means the transfer of power to users/members rather than having a single centralized authority governing everything; it enables various use cases in finance, governance, voting, fundraising, etc....

Continue reading
How to Connect to Terra with JavaScript using Terra.js
Apr 12, 2022

Stablecoins have been bridging the gap between traditional currencies and blockchains. Stablecoins offer stable price tokens pegged by a reserve asset which is often a fiat current like USD, EUR, GBP. The Terra protocol provides a framework to work with stablecoins. This...

Continue reading
How To Fork Ethereum Mainnet with Hardhat
Apr 12, 2022

Forking the chain at an older block of the blockchain is helpful if you want to simulate the blockchain’s state at that block; Hardhat has this functionality built in. In this guide, let’s go through the process of forking the Ethereum Mainnet at an older...

Continue reading
How to connect to Ethereum using PHP
Apr 12, 2022

PHP is a very popular choice among developers and has a vast community due to its long presence in web development. In this guide, we’ll cover how to connect to Ethereum with PHP using the web3.php...

Continue reading
How to use Subspace with QuickNode
Apr 12, 2022

In this guide, we'll understand a bit about reactive development and how to use Subspace with QuickNode.JavaScript is the programming language behind most of the internet apps and websites. JavaScript today has become one of the most used programming languages,...

Continue reading
How to Connect Your Dapp With MetaMask Using Ethers.js
Dec 29, 2021

In our dApp, we will have a simple react user interface that has a material button asking the user to connect to MetaMask. And if they do not have an account, they can create one or log in to their account. They will then view their wallet balance and address displayed on...

Continue reading
How to generate a new Ethereum address in Go
Dec 29, 2021

Golang is very popular among backend developers for building infrastructures and microservices. Go is a procedural programming language. Developed in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson at Google, then launched in 2009 as...

Continue reading
How to generate a new Ethereum address in Python
Dec 29, 2021

Python is one of the most versatile programming languages out there with an abundance of use cases; We can build many applications with Python from client-side to back end. In this guide, we will cover creating an Ethereum address in Python using the

Continue reading
How to Lazy Mint an NFT on Rarible with Rarepress
Apr 12, 2022

NFTs are great for creators to monetize their artwork and for people to get ownership of an item. But since gas prices are usually high given the highly in-demand space on Ethereum, minting an NFT or an NFT collection can become costly for a creator. Lazy minting solves...

Continue reading