Beginner's tutorial on making transactions on the CELO blockchain.

hellocelo.js

//
// Add package imports and setup here
//

// CELO Address: 0x557A2ea7aCa59Edaaff62cC46fd65b1650c8de85

// 1. Import ContractKit
const Web3 = require("web3");
const ContractKit = require("@celo/contractkit");

// 2. Init a new kit, connected to the alfajores testnet
const web3 = new Web3('https://alfajores-forno.celo-testnet.org');
const kit = ContractKit.newKitFromWeb3(web3);

//
// Read Accounts
//

async function readAccount(){
    // 3. Get the token contract wrappers
    let goldToken = await kit.contracts.getGoldToken(); // CELO Contract.
    let stableToken = await kit.contracts.getStableToken(); //cUSD Contract.

    // 4. Address to look up
    let anAddress = '0xD86518b29BB52a5DAC5991eACf09481CE4B0710d';

    // 5. Get Get token balances
    let celoBalance = await goldToken.balanceOf(anAddress);
    let cUSDBalance = await stableToken.balanceOf(anAddress);

    // Print balances
    console.log(`${anAddress} CELO balance: ${celoBalance}`);
    console.log(`${anAddress} cUSD balance: ${cUSDBalance}`);
}

//
// Create an Account
//

// 6. Import the getAccount function
const getAccount = require("./getAccount").getAccount;

async function createAccount(){
    // 7. Get your account    
    let account = await getAccount();

    // 8. Get the token contract wrappers
    let goldToken = await kit.contracts.getGoldToken();
    let stableToken = await kit.contracts.getStableToken();

    // 9. Get your token balances
    let celoBalance = await goldToken.balanceOf(account.address);
    let cUSDBalance = await stableToken.balanceOf(account.address);

    // Print your account info
    console.log(`Your account address: ${account.address}`);
    console.log(`Your account CELO balance: ${celoBalance}`);
    console.log(`Your account cUSD balance: ${cUSDBalance}`);
}

//
// Send CELO
//

async function send(){
    // 10. Get your account
    let account = await getAccount();

    // 11. Add your account to ContractKit to sign transactions
    kit.connection.addAccount(account.privateKey);

    // 12. Specify recipient Address
    let anAddress = '0xD86518b29BB52a5DAC5991eACf09481CE4B0710d';

    // 13. Specify an amount to send
    let amount = 123456789;

    // 14. Get the token contract wrappers
    let goldToken = await kit.contracts.getGoldToken();
    let stableToken = await kit.contracts.getStableToken();
    
    // 15. Transfer CELO and cUSD from your account to anAddress
    let celotx = await goldToken.transfer(anAddress, amount).send({from: account.address});
    let cUSDtx = await stableToken.transfer(anAddress, amount).send({from: account.address, feeCurrency: stableToken.address});

    // 16. Wait for the transactions to be processed
    let celoReceipt = await celotx.waitReceipt();
    let cUSDReceipt = await cUSDtx.waitReceipt();

    // 17. Print receipts
    console.log('CELO receipt: %o', celoReceipt);
    console.log('cUSD receipt: %o', cUSDReceipt);

    // 18. Get your new balances
    let celoBalance = await goldToken.balanceOf(account.address);
    let cUSDBalance = await stableToken.balanceOf(account.address);

    // 19. Print new balances
    console.log(`Your new account CELO balance: ${celoBalance}`);
    console.log(`Your new account cUSD balance: ${cUSDBalance}`);
}

readAccount();
createAccount();
send();