Example code minting BPros without Truffle

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In the following example we will learn how to:
Use the ABIs of Money on Chain.
Get the maximum amount of BPRO available.
Get the price of the BPRO in RBTC.
Minting BPROs
We will use the testnet network
First we create a new node project.
mkdir example-mint-bpro
cd example-mint-bpro
npm init
Let's add the necessary dependencies to run the project.
npm install --save bignumber.js
npm install --save web3
npm install --save truffle-hdwallet-provider
Now we create a new script called mintBpro.js with the following code:
const HDWalletProvider = require('truffle-hdwallet-provider');
const BigNumber = require('bignumber.js');
const Web3 = require('web3');
//You must compile the smart contracts or use the official ABIs of the repository
const MocAbi = require('./contracts/moc/MoC.json');
const MoCInrateAbi = require('./contracts/moc/MoCInrate.json');
const MoCExchangeAbi = require('./contracts/moc/MoCExchange.json');
const MoCStateAbi = require('./contracts/moc/MoCState.json');
​
//Config params to TestNet
const endpoint = 'https://public-node.testnet.rsk.co';
//a mnemonic is 12 words instead of a single private key to sign the //transactions
const mnemonic = 'chase chair crew elbow uncle awful cover asset cradle pet loud puzzle';
const provider = new HDWalletProvider(mnemonic, endpoint);
const web3 = new Web3(provider);
​
//Contract addresses on testnet
const mocContractAddress = '<contract-address>';
const mocInrateAddress = '<contract-address>';
const mocExchangeAddress = '<contract-address>';
const mocStateAddress = '<contract-address>';
const gasPrice = 60000000;
​
const execute = async () => {
  /**
   * Loads an specified contract
   * @param {json ABI} abi
   * @param {localhost/testnet/mainnet} contractAddress
   */
  const getContract = async (abi, contractAddress) => new web3.eth.Contract(abi, contractAddress);
​
  /**
   * Transforms BigNumbers into
   * @param {*} number
   */
  const toContract = number => new BigNumber(number).toFixed(0);
​
  // Loading moc contract
  const moc = await getContract(MocAbi.abi, mocContractAddress);
  if (!moc) {
    throw Error('Can not find MoC contract.');
  }
​
  // Loading mocInrate contract. It is necessary to get fees for transaction types
  const mocInrate = await getContract(MoCInrateAbi.abi, mocInrateAddress);
  if (!mocInrate) {
    throw Error('Can not find MoC Inrate contract.');
  }
​
  // Loading mocExchange contract. It is necessary to compute commissions and vendor markup
  const mocExchange = await getContract(MoCExchangeAbi.abi, mocExchangeAddress);
  if (!mocExchange) {
    throw Error('Can not find MoC Exchange contract.');
  }
​
  // Loading mocState contract. It is necessary to compute max BPRO available to mint
  const mocState = await getContract(MoCStateAbi.abi, mocStateAddress);
  if (!mocState) {
    throw Error('Can not find MoCState contract.');
  }
​
  const mintBpro = async (btcAmount, vendorAccount) => {
    web3.eth.getAccounts().then(console.log);
    const from = '0x088f4B1313D161D83B4D8A5EB90905C263ce0DbD';
    const weiAmount = web3.utils.toWei(btcAmount, 'ether');
    let btcCommission;
    let mocCommission;
    let btcMarkup;
    let mocMarkup;
    // Set transaction types
    const txTypeFeesRBTC = await mocInrate.methods.MINT_BPRO_FEES_RBTC();
    const txTypeFeesMOC = await mocInrate.methods.MINT_BPRO_FEES_MOC();
    // Compute fees
    const params = {
      account: from,
      amount: toContractBN(weiAmount).toString(),
      txTypeFeesMOC: txTypeFeesMOC.toString(),
      txTypeFeesRBTC: txTypeFeesRBTC.toString(),
      vendorAccount
    };
​
    ({
      btcCommission,
      mocCommission,
      btcMarkup,
      mocMarkup
    } = await mocExchange.methods.calculateCommissionsWithPrices(params, { from }));
    // Computes totalBtcAmount to call mintBpro. If commission is paid in RBTC, add it to value
    const totalBtcAmount = toContract(btcCommission.plus(btcMarkup).plus(weiAmount));
    console.log(`Calling Bpro minting with account: ${from} and amount: ${weiAmount}.`);
    const tx = moc.methods
      .mintBProVendors(weiAmount, vendorAccount)
      .send({ from, value: totalBtcAmount, gasPrice }, function(error, transactionHash) {
        if (error) console.log(error);
        if (transactionHash) console.log('txHash: '.concat(transactionHash));
      });
​
    return tx;
  };
​
  function logEnd() {
    console.log('End Example');
  }
​
  const btcAmount = '0.00005';
  const vendorAccount = '<vendor-address>';
​
  // Call mint
  await mintBpro(btcAmount, vendorAccount, logEnd);
};
​
execute()
  .then(() => console.log('Completed'))
  .catch(err => {
    console.log('Error', err);
  });
Example code minting BPros
Example code redeeming BPros
Last modified 9mo ago
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