Integrating Ethereum Wallet Functionality
Lesson 5
Integrating Ethereum Wallet Functionality
Welcome to Lesson 5 of the Crypto Portfolio Tracker app tutorial! Following our successful integration of Bitcoin wallet functionality, we're ready to broaden our application's horizon by incorporating Ethereum. Known for its extensive use of smart contracts and as a backbone for decentralized applications (DApps), Ethereum is a crucial addition to our tracker, enriching the user experience with a multifaceted view of their crypto assets.
Why Ethereum?
Ethereum transcends simple cryptocurrency transactions by offering a platform for deploying smart contracts and DApps. Integrating Ethereum allows users to manage Ethereum assets alongside Bitcoin, tapping into Ethereum's dynamic ecosystem and widespread adoption.
Introducing Ethereum
Ethereum brings several distinctive features:
Smart Contracts: Self-executing contracts with terms of agreement in the code.
Gas Fees: Transaction fees, known as gas, vary by network congestion and transaction complexity.
Web3.js: A JavaScript library enabling interaction with the Ethereum blockchain from web applications.
To begin interacting with Ethereum in our app, we start with:
npm install web3
Critical Concepts for Ethereum Integration:
Ethereum Wallet Interaction: We'll enhance the interface to seamlessly manage Ethereum assets.
Web3.js Usage: Our application will use Web3.js for blockchain queries, transactions, and innovative contract interactions.
MetaMask Integration: As a popular Ethereum wallet extension, MetaMask facilitates direct interaction with Ethereum within the browser.
Integrating Ethereum into Our Application
This lesson covers adding Ethereum capabilities to our Node.js backend. We'll start by installing Web3.js and establishing a connection to the Ethereum network. Our focus will be on functionalities such as retrieving Ethereum wallet balances, executing transactions, and interacting with smart contracts.
Update the map to retrieve the fetchEthereumBalance function
import { fetchBitcoinBalance, fetchEthereumBalance } from "./fetchWalletData";
const fetchBalanceFunctions = {
bitcoin: fetchBitcoinBalance,
ethereum: fetchEthereumBalance,
// Add more cryptocurrencies and their respective functions here
};
export default fetchBalanceFunctions;Create the fetchEthereumBalance function
import { Web3 } from "web3";
const provider = `https://sepolia.infura.io/v3/${process.env.INFURA_API_KEY}`;
const web3Provider = new Web3.providers.HttpProvider(
provider || "ws://localhost:8545"
);
const web3 = new Web3(web3Provider);
export async function fetchEthereumBalance(address: string) {
try {
const balance = await web3.eth.getBalance(address);
const balanceInEther = Number.parseFloat(
web3.utils.fromWei(balance, "ether")
);
return balanceInEther;
} catch (error) {
throw new Error(`Unable to get balance for address: ${address}`);
}
}Conclusion
By completing this lesson, you've comprehensively understood incorporating Ethereum wallet functionalities into your app. This empowers users with an integrated platform for managing their Ethereum assets, setting the stage for further Ethereum-based feature development.
Congratulations on finishing Lesson 5! Your Crypto Portfolio Tracker now supports a broader range of functionalities, making it a more versatile tool for users. The journey into blockchain and cryptocurrency development unfolds with exciting possibilities.
Next Steps
We are moving forward to Lesson 6, which involves testing the functionality of our Ethereum and Bitcoin Wallet Features. We will utilize Jest to verify that everything is functioning as expected, ensuring the security and stability of our application. Stay with us as we delve into more intriguing blockchain concepts, commencing with the thorough testing of our application to guarantee flawless operation.
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