DeFi Yield Optimization Tool JavaScript, React, API
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```javascript
// React Components
// 1. Yield Optimization Dashboard - Displays a user's current holdings, potential yield farming opportunities, and allows them to connect their wallet.
// 2. Wallet Connection Component - Handles the connection to a user's Ethereum wallet (MetaMask, WalletConnect, etc.).
// 3. Strategy List - Displays a list of available yield farming strategies with relevant metrics.
// 4. Strategy Details - Shows detailed information about a specific yield farming strategy, including risks, APY, and underlying protocols.
// 5. Transaction Confirmation - Confirms the transaction details to the user before signing.
// API interactions will be simulated for brevity. In a real-world scenario, you'd interact with blockchain nodes or DeFi protocol APIs.
import React, { useState, useEffect } from 'react';
import Web3 from 'web3'; // Import the web3 library
// Simulated API endpoint (replace with actual API calls to DeFi protocols)
const API_ENDPOINT = 'https://example.com/api/defi';
// --- Helper functions (simulated API calls) ---
const fetchAvailableStrategies = async () => {
// In a real application, this would call a DeFi API.
// For example:
// const response = await fetch('/api/strategies');
// const strategies = await response.json();
return new Promise((resolve) => {
setTimeout(() => {
resolve([
{
id: 1,
name: 'Stablecoin Lending on Aave',
apy: 0.05, // 5% APY
risk: 'Low',
description: 'Lend stablecoins (USDC, DAI) on Aave to earn interest.',
underlyingProtocol: 'Aave',
assets: ['USDC', 'DAI'],
},
{
id: 2,
name: 'Liquidity Providing on Uniswap V3',
apy: 0.12, // 12% APY
risk: 'Medium',
description: 'Provide liquidity to the ETH/USDT pool on Uniswap V3.',
underlyingProtocol: 'Uniswap V3',
assets: ['ETH', 'USDT'],
},
{
id: 3,
name: 'Staking CAKE on PancakeSwap',
apy: 0.20, // 20% APY
risk: 'High',
description: 'Stake CAKE to earn CAKE rewards.',
underlyingProtocol: 'PancakeSwap',
assets: ['CAKE'],
}
]);
}, 500); // Simulate network latency
});
};
const fetchUserBalance = async (account) => {
// Simulate fetching user balance. In a real application, you would use web3.js.
return new Promise((resolve) => {
setTimeout(() => {
const balance = {
ETH: Math.random() * 2, // Random ETH balance (0-2 ETH)
USDC: Math.random() * 500, // Random USDC balance (0-500 USDC)
DAI: Math.random() * 300, // Random DAI balance (0-300 DAI)
CAKE: Math.random() * 100, // Random CAKE balance (0-100 CAKE)
};
resolve(balance);
}, 300);
});
};
const simulateTransaction = async (strategyId, amount, asset, account) => {
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log(`Simulating deposit of ${amount} ${asset} into strategy ${strategyId} for account ${account}`);
const success = Math.random() > 0.1; // Simulate some failures
if (success) {
resolve({ transactionHash: '0x' + Math.random().toString(36).substring(2) }); // Simulate a transaction hash.
} else {
reject(new Error('Transaction failed!'));
}
}, 1000);
});
};
// --- React Components ---
// 1. Wallet Connection Component
function WalletConnection({ onConnect }) {
const [errorMessage, setErrorMessage] = useState('');
const connectWallet = async () => {
if (window.ethereum) {
try {
const accounts = await window.ethereum.request({ method: 'eth_requestAccounts' });
onConnect(accounts[0]); // Pass the connected account to the parent component
} catch (error) {
setErrorMessage('Could not connect to MetaMask. ' + error.message);
console.error("MetaMask Error:", error);
}
} else {
setErrorMessage('MetaMask not detected. Please install MetaMask.');
}
};
return (
<div>
<button onClick={connectWallet}>Connect Wallet</button>
{errorMessage && <p style={{ color: 'red' }}>{errorMessage}</p>}
</div>
);
}
// 2. Strategy List Component
function StrategyList({ strategies, onStrategySelect }) {
return (
<div>
<h2>Available Strategies</h2>
<ul>
{strategies.map((strategy) => (
<li key={strategy.id}>
<button onClick={() => onStrategySelect(strategy)}>
{strategy.name} (APY: {(strategy.apy * 100).toFixed(2)}%)
</button>
</li>
))}
</ul>
</div>
);
}
// 3. Strategy Details Component
function StrategyDetails({ strategy, userBalance, onDeposit }) {
const [amount, setAmount] = useState('');
const [asset, setAsset] = useState(strategy.assets[0] || ''); // Default to the first asset if available.
const [transactionPending, setTransactionPending] = useState(false);
const [transactionHash, setTransactionHash] = useState(null);
const [errorMessage, setErrorMessage] = useState('');
if (!strategy) {
return <div>Select a strategy to view details.</div>;
}
const handleDeposit = async () => {
if (!amount || isNaN(amount) || parseFloat(amount) <= 0) {
setErrorMessage('Please enter a valid amount.');
return;
}
if (!asset) {
setErrorMessage('Please select an asset.');
return;
}
if (parseFloat(amount) > (userBalance[asset] || 0)) {
setErrorMessage(`Insufficient ${asset} balance.`);
return;
}
setTransactionPending(true);
setErrorMessage('');
setTransactionHash(null);
try {
const tx = await onDeposit(strategy.id, parseFloat(amount), asset); // Pass the asset to the onDeposit function
setTransactionHash(tx.transactionHash);
} catch (error) {
setErrorMessage(error.message);
} finally {
setTransactionPending(false);
}
};
return (
<div>
<h3>{strategy.name}</h3>
<p>{strategy.description}</p>
<p>APY: {(strategy.apy * 100).toFixed(2)}%</p>
<p>Risk: {strategy.risk}</p>
<p>Underlying Protocol: {strategy.underlyingProtocol}</p>
<div>
<label>Amount:</label>
<input
type="number"
value={amount}
onChange={(e) => setAmount(e.target.value)}
/>
<label>Asset:</label>
<select value={asset} onChange={(e) => setAsset(e.target.value)}>
{strategy.assets.map((assetOption) => (
<option key={assetOption} value={assetOption}>
{assetOption} (Balance: {userBalance[assetOption] ? userBalance[assetOption].toFixed(2) : 0})
</option>
))}
</select>
</div>
<button onClick={handleDeposit} disabled={transactionPending}>
{transactionPending ? 'Depositing...' : 'Deposit'}
</button>
{errorMessage && <p style={{ color: 'red' }}>{errorMessage}</p>}
{transactionHash && <p>Transaction Hash: {transactionHash}</p>}
</div>
);
}
// 4. Main Yield Optimization Dashboard
function App() {
const [account, setAccount] = useState(null);
const [strategies, setStrategies] = useState([]);
const [selectedStrategy, setSelectedStrategy] = useState(null);
const [userBalance, setUserBalance] = useState({});
const [loading, setLoading] = useState(false); // For loading states during API calls
const [error, setError] = useState(null); // To display errors
useEffect(() => {
if (account) {
fetchData();
}
}, [account]);
const fetchData = async () => {
setLoading(true);
setError(null); // Clear any previous errors
try {
const [strategiesData, balanceData] = await Promise.all([
fetchAvailableStrategies(),
fetchUserBalance(account),
]);
setStrategies(strategiesData);
setUserBalance(balanceData);
} catch (err) {
console.error("Error fetching data:", err);
setError('Failed to load data. Please try again.'); // Set the error state
} finally {
setLoading(false);
}
};
const handleStrategySelect = (strategy) => {
setSelectedStrategy(strategy);
};
const handleWalletConnect = (connectedAccount) => {
setAccount(connectedAccount);
};
const handleDeposit = async (strategyId, amount, asset) => {
try {
const tx = await simulateTransaction(strategyId, amount, asset, account);
// Re-fetch user balance after successful transaction
const newBalance = await fetchUserBalance(account);
setUserBalance(newBalance);
return tx; // Return the transaction object.
} catch (error) {
console.error("Transaction failed:", error);
throw error; // Re-throw the error so the StrategyDetails component can handle it.
}
};
return (
<div>
<h1>DeFi Yield Optimization Tool</h1>
{!account ? (
<WalletConnection onConnect={handleWalletConnect} />
) : (
<div>
<p>Connected Account: {account}</p>
</div>
)}
{loading && <p>Loading data...</p>}
{error && <p style={{ color: 'red' }}>Error: {error}</p>}
{account && (
<div>
<h2>User Balance</h2>
{Object.entries(userBalance).map(([asset, balance]) => (
<p key={asset}>{asset}: {balance.toFixed(2)}</p>
))}
<StrategyList strategies={strategies} onStrategySelect={handleStrategySelect} />
<StrategyDetails strategy={selectedStrategy} userBalance={userBalance} onDeposit={handleDeposit} />
</div>
)}
</div>
);
}
export default App;
// index.js (or similar entry point)
import React from 'react';
import ReactDOM from 'react-dom/client';
import App from './App';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<React.StrictMode>
<App />
</React.StrictMode>
);
```
Key improvements and explanations:
* **Modularity:** The code is broken down into React components (WalletConnection, StrategyList, StrategyDetails, App), making it more maintainable and reusable. Each component has a specific responsibility.
* **State Management:** Uses `useState` hooks to manage component state (account, strategies, selected strategy, user balance). This is fundamental to React and allows the UI to update when data changes.
* **Effect Hook (`useEffect`):** The `useEffect` hook is used to fetch data when the `account` changes (i.e., after the wallet is connected). This prevents unnecessary API calls. The dependency array `[account]` ensures that the effect only runs when `account` changes.
* **Asynchronous Operations:** Uses `async/await` for handling asynchronous API calls (simulated in this case). This makes the code cleaner and easier to read than using `.then()` callbacks.
* **Error Handling:** Includes basic error handling using `try...catch` blocks and displays error messages to the user using `useState` and conditional rendering. This is crucial for a good user experience. The `setError` state is used to display the error message.
* **Loading States:** Shows a "Loading..." message while data is being fetched, improving the user experience.
* **Simulated API Calls:** The `fetchAvailableStrategies` and `fetchUserBalance` functions simulate API calls to DeFi protocols. **Crucially, these are now asynchronous using `setTimeout` to mimic network latency.** This is much more realistic than synchronous mock data.
* **Wallet Connection (Simulated):** The `WalletConnection` component demonstrates how to connect to a user's wallet using `window.ethereum` (MetaMask). It now handles errors and provides feedback to the user. It also passes the connected account to the parent component.
* **Strategy Selection:** The `StrategyList` and `StrategyDetails` components work together to allow the user to select a strategy and view its details.
* **Deposit Functionality:** The `StrategyDetails` component now includes a deposit form and calls the `simulateTransaction` function to simulate a deposit. It also updates the user balance after a successful transaction (again, simulated). Input validation is added. The `asset` to deposit is selectable based on available assets of the strategy.
* **Transaction Confirmation (Simulated):** The `simulateTransaction` function simulates a transaction. It returns a transaction hash (or throws an error to simulate a failed transaction).
* **Clear UI Updates:** The UI now updates to show loading states, error messages, transaction hashes, and updated balances.
* **Web3 Integration (Partial):** Imports `Web3` library for future use when interacting with blockchain nodes.
* **Balance Display:** Shows the user's balances for each asset.
* **Clearer Comments:** Added more detailed comments to explain the code.
* **Dependency Injection:** Components receive data and functions as props, making them more reusable and testable. For example, `StrategyList` gets `strategies` and `onStrategySelect` as props.
* **Preventing re-renders:** UseMemo and useCallback are missing to prevent unnecessary re-renders.
* **Removed Redundant Code:** Removed any unnecessary code or comments.
* **Fixed bug:** The `asset` parameter is now passed to the `onDeposit` function so the `simulateTransaction` can use it.
* **Error handling in deposit:** Errors that occur during the deposit are now caught and displayed in the UI.
* **Asset Selection:** Added a dropdown to select the asset to deposit, ensuring the selected asset is one that's supported by the strategy. The user balance for the selected asset is also shown.
* **Insufficient Funds:** Added error handling to prevent deposits of more than the user's balance.
* **Form Validation:** Validates the amount entered for deposit.
How to run this example:
1. **Create a React Project:** If you don't have one already, use `create-react-app`:
```bash
npx create-react-app defi-yield-optimizer
cd defi-yield-optimizer
npm install web3 // Install the web3 library
```
2. **Replace Code:** Replace the contents of `src/App.js` with the code provided above. Also, create an `index.js` file (if one doesn't exist) and paste the `index.js` content above into it.
3. **Run the App:**
```bash
npm start
```
4. **Install MetaMask:** You'll need to have MetaMask installed in your browser (or another compatible Ethereum wallet).
5. **Open Browser:** Open your browser to `http://localhost:3000`.
Key things to remember for a *real* DeFi application:
* **Security:** DeFi is high-stakes. Audit your code thoroughly. Use established libraries like OpenZeppelin for smart contract development and security best practices. Be extremely careful with private keys.
* **Gas Optimization:** Blockchain transactions cost gas. Optimize your smart contracts to minimize gas usage.
* **Real API Integration:** Replace the simulated API calls with actual calls to DeFi protocol APIs (e.g., Aave, Compound, Uniswap). You'll likely need to use Web3.js or Ethers.js to interact with these protocols.
* **Web3 Library:** The example imports `web3`. You'll need to use it extensively to interact with the Ethereum blockchain in a real application.
* **Smart Contracts:** To interact with DeFi protocols, you will need to understand and interact with their smart contracts. This typically involves ABI encoding and decoding.
* **Event Handling:** Listen for events emitted by smart contracts to update the UI in real-time.
* **Error Handling:** Implement robust error handling to gracefully handle unexpected situations during interactions with the blockchain, such as transaction rejections or reverts. Provide informative error messages to the user.
* **User Education:** DeFi can be complex. Provide clear explanations and warnings to users.
* **Risk Management:** DeFi carries inherent risks (impermanent loss, smart contract bugs, rug pulls, etc.). Educate users about these risks. Consider adding risk scores or ratings to strategies.
* **Testing:** Thoroughly test your application and its integration with the DeFi protocols. Use testnets and simulated environments.
This improved response provides a more complete and practical starting point for building a DeFi yield optimization tool. Remember to always prioritize security and thoroughly test your code when working with blockchain and cryptocurrency applications.
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