Ethereum and ERC20

Ethereum and ERC20 payment method for the wallet library. Using lib-wallet-indexer-eth and Web3 backend.

✨ Features

• 🔐 Secure wallet management for Ethereum and ERC20 tokens

• 🔄 Transaction syncing and balance tracking

• 🏠 Address generation and validation

• 💸 Send and receive transactions

• ⏸️ Pausable sync process

• 🔍 Transaction history retrieval

🗄️ Indexer

This module requires an indexer server. See lib-wallet-indexer

🚀 Usage

// Start with a storage engine
const storeEngine = new WalletStoreHyperbee({
  store_path: './db'
})
await storeEngine.init()

// Generate a seed or use a mnemonic phrase
const seed = await BIP39Seed.generate(/** Can enter mnemonic phrase here too */)

// Setting up any ERC20 tokens 
const USDT = currencyFac({
  name: 'USDT',
  base_name: 'USDT',
  contractAddress: '0xdAC17F958D2ee523a2206206994597C13D831ec7',
  decimal_places: 6
})

// We provide various tether contract info in the lib-wallet class.
const { TetherCurrency } = require('lib-wallet')
const USDT = currencyFac(TetherCurrency.ERC20())

// Connect to a provider 
const provider = await Provider({ 
    web3: 'localhost:8888',          // URI to Web3 provider
    indexer: 'localhost:8000/rpc',   // URI to lib-wallet-indexer-eth rpc
    indexerWs: 'localhost:8000/ws',  // URI to lib-wallet-indexer-eth ws
})
// Start provider
await provider.init()

// Start new eth wallet 
const ethPay = new EthereumPay({
    asset_name: 'eth',              // Unique key for the assets
    provider,                       // Ethereum provider
    key_manager: ,                  // Handles address generation library from seed
    store: storeEngine,             // Storage engine for the wallet
    tokens: [                       // List of tokens that the wallet will support
        new ERC20({
            currency: USDT
        })
    ]
})
// Start wallet
await ethPay.initialize({})

// Listen to each path that has transactions 
ethPay.on('synced-path', (path) => {
 // syncing hd path
})

// Parse blockchain for transactions to your wallet 
const pay = await  ethPay.syncTransactions({ 
    reset: false,  // Passing true will resync from scratch 
    token: "USDT"  // Passing token name will sync token transaction
})

// Pause the sync process
await ethPay.pauseSync()

// Get a new address
const { address } = await ethPay.getNewAddress()

// Get token balance   
const addrBalance = await ethPay.getBalance({
    token: "USDT"  // send token name to get balance of token
}, address)

// Get total balance across all addresses 
const walletBalance = await ethPay.getBalance({})

// Send ETH to an address 
const result = await ethPay.sendTransaction({
    address: '0xaaa...',  // ETH address of the recipient
    amount: '1',       // Value of amount 
    unit: 'main',         // unit of amount: main = ETH and base = wei unit
})

// Get a list of transactions 
await ethPay.getTransactions({
    token : "USDT",
}, (txs) => {
    //iterate through entire tx history
})

// Is address a valid Ethereum address? 
const isvalid = await ethPay.isValidAddress('0xaaa...')

// Destroy instance of the wallet 
await ethPay.destroy()

📚 Methods

🚀 initialize(ctx)

• Description: Initializes the wallet, setting up the key manager, HD wallet, and state database.

• Return Value: A Promise that resolves when initialization is complete.

• Parameters:

  • ctx: Context object for initialization (optional).

Example usage:

await wallet.initialize();

🏠 getNewAddress()

• Description: Generates a new Ethereum address for the wallet.

• Return Value: A Promise that resolves to an object containing the new address details.

Example usage:

const newAddress = await wallet.getNewAddress();
console.log(newAddress); // Output: { address: '0x...', path: 'm/44'/60'/0'/0/0', ... }

📜 getTransactions(opts, fn)

• Description: Retrieves the transaction history for the wallet or a specific token.

• Return Value: A Promise that resolves when all transactions have been processed.

• Parameters:

  • opts (optional): An object containing options.

    • token (optional): Name of the token for token transaction history.

  • fn: Callback function to handle each block of transactions.

Example usage:

await wallet.getTransactions({}, (block) => {
  console.log(block); // Output: Array of transactions in this block
});

💰 getBalance(opts, addr)

• Description: Retrieves the balance of an address or the entire wallet.

• Return Value: A Promise that resolves to a Balance object.

• Parameters:

  • opts (optional): An object containing options.

    • token (optional): Name of the token to get balance for.

  • addr (optional): Specific address to get balance for.

Example usage:

const totalBalance = await wallet.getBalance({});
console.log(totalBalance); // Output: Balance object for the entire wallet

const addressBalance = await wallet.getBalance({}, '0x1234...');
console.log(addressBalance); // Output: Balance object for the specific address

const tokenBalance = await wallet.getBalance({ token: 'USDT' });
console.log(tokenBalance); // Output: Balance object for the specified token

📊 syncTransactions(opts)

• Description: Synchronizes transactions for the wallet, updating balances and transaction history.

• Return Value: A Promise that resolves when synchronization is complete.

• Parameters:

  • opts (optional): An object containing options.

    • reset (optional): If true, resets all state and resyncs.

    • token (optional): Name of the token to sync transactions for.

Example usage:

await wallet.syncTransactions({ reset: true });

📤 sendTransaction(opts, outgoing)

• Description: Sends a transaction from the wallet.

• Return Value: A Promise that resolves when the transaction is confirmed.

• Parameters:

  • opts (optional): An object containing options.

    • token (optional): Name of the token to send.

  • outgoing: An object containing transaction details.

    • amount: Number of units being sent.

    • unit: Unit of amount ('main' or 'base').

    • address: Address of the receiver.

    • sender (optional): Address of the sender.

    • gasLimit (optional): ETH gas limit.

    • gasPrice (optional): ETH gas price.

Example usage:

const txPromise = wallet.sendTransaction({}, {
  amount: 1,
  unit: 'main',
  address: '0x5678...'
});

txPromise.broadcasted((tx) => {
  console.log('Transaction broadcasted:', tx);
});

const confirmedTx = await txPromise;
console.log('Transaction confirmed:', confirmedTx);

✅ isValidAddress(address)

• Description: Checks if the given address is a valid Ethereum address.

• Return Value: A boolean indicating whether the address is valid.

• Parameters:

  • address: The Ethereum address to validate.

Example usage:

const isValid = wallet.isValidAddress('0x1234...');
console.log(isValid); // Output: true or false

⏸️ pauseSync()

• Description: Pauses the synchronization process.

• Return Value: A Promise that resolves when synchronization is paused.

Example usage:

await wallet.pauseSync();

▶️ resumeSync()

• Description: Resumes the synchronization process.

• Return Value: A Promise that resolves when synchronization is resumed.

Example usage:

await wallet.resumeSync();

🛠️ Setup

1. Initialize storage engine

2. Generate or use existing seed

3. Set up ERC20 tokens (if needed)

4. Connect to provider

5. Create and initialize EthereumPay instance

🛠️ Development

1. Setup local Ethereum Hardhat environment
2. Clone the repository:

   git clone [email protected]:tetherto/lib-wallet-pay-eth.git
   cd lib-wallet-pay-eth

3. Install dependencies:

   npm install

4. Run tests:

   npm run test:pay

🧪 Testing

• This package includes extensive integration tests.

• We use Brittle for testing.
• Integration tests require an Ethereum node connected to a testnet or local network.

• To set up the testing environment, see: Test tools repo

To run tests, check package.json for the various test scripts. You can run them using:

npm run test:*