Main Contract
  • Introduction
  • Money on Chain platform
    • Main concepts
    • System states
    • Public actions
      • User actions
      • Process actions
    • Contracts architecture
      • MoC
      • CommissionSplitter
      • MoCState
      • MoCBucketContainer
      • MoCSettlement
      • MoCHelperLib
      • MoCLibConnection
      • MoCConverter
      • MoCExchange
      • MoCConnector
      • MoCBProxManager
      • MoCInrate
      • MoCVendors
      • MoCWhitelist
      • MoCBase
      • OwnerBurnableToken
      • BProToken
      • DocToken
      • MoCToken
      • PriceProvider
    • Contract mocks
    • Relevant patterns and choices
    • Data dictionary
    • Getting started
  • Integration with MoC platform
    • Introduction to MoC
      • The MoC Contract
      • MoC Precisions
      • MoC State Contracts
    • Getting BPros
      • Minting BitPros
      • Redeeming BitPros
    • Getting DoCs
      • Minting DoCs
      • Redeeming DoCs
        • On Settlement: redeemDocRequest
        • On Settlement: alterRedeemRequestAmount
        • Outside Settlement: redeemFreeDocVendors
        • On Liquidation State: redeemAllDoc
        • How-to
    • Commission fees values
    • Vendors
    • Fees calculation
    • From outside the blockchain
      • Using RSK nodes
      • Using web3
      • Official Money on Chain ABIs
      • Events
      • Example code minting BPros
      • Example code minting BPros without Truffle
      • Example code redeeming BPros
      • Example code redeeming BPros without Truffle
      • Example code minting DOC
      • Example code redeeming free DOC
      • Example code redeeming DOC Request
      • Example code redeeming all DOC
  • Smart contracts
    • Contracts verification
    • ABIs documentation
      • BProToken
      • BtcPriceProviderMock
      • DocToken
      • ERC20Mintable
      • Governed
      • Initializable
      • MakeStoppable
      • MakeUnstoppable
      • MoC
      • MoCBProxManager
      • MoCBucketContainer
      • MoCConnector
      • MoCConverter
      • MoCEMACalculator
      • MoCExchange
      • MoCHelperLib
      • MoCHelperLibMock
      • MoCInrate
      • MoCLibConnection
      • MoCPriceProviderMock
      • MoCSettlement
      • MoCSettlementMock
      • MoCState
      • MoCStateMock
      • MoCToken
      • MoCVendors
      • MoCWhitelist
      • MockMakeStoppable
      • MockMakeUnstoppable
      • MockStopper
      • MockUpgradeDelegator
      • MockUpgraderTemplate
      • OwnerBurnableToken
      • Pausable
      • PriceFeed
      • PriceFeederAdder
      • PriceFeederRemover
      • PriceProvider
      • RevertingOnSend
      • Stoppable
      • Stopper
      • UpgradeDelegator
      • UpgraderTemplate
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On this page
  1. Integration with MoC platform
  2. From outside the blockchain

Example code redeeming BPros

In the following example we will learn how to:

  • Get the maximum amount of BPRO available to redeem.

  • Get BPRO balance of an account.

  • Redeem BPROs.

We will use truffle and testnet network.

First we create a new node project.

mkdir example-redeem-bpro
cd example-redeem-bpro
npm init

Let's add the necessary dependencies to run the project.

npm install --save web3

Example

const Web3 = require('web3');
//You must compile the smart contracts or use the official ABIs of the repository
const MocAbi = require('../../build/contracts/MoC.json');
const MoCStateAbi = require('../../build/contracts/MoCState.json');
const BProTokenAbi = require('../../build/contracts/BProToken.json');
const truffleConfig = require('../../truffle');

/**
 * Get a provider from truffle.js file
 * @param {String} network
 */
const getDefaultProvider = network =>
  truffleConfig.networks[network].provider || truffleConfig.networks[network].endpoint;

/**
 * Get a gasPrice from truffle.js file
 * @param {String} network
 */
const getGasPrice = network => truffleConfig.networks[network].gasPrice || 60000000;

/**
 * Get a new web3 instance from truffle.js file
 */
const getWeb3 = network => {
  const provider = getDefaultProvider(network);
  return new Web3(provider, null, {
    transactionConfirmationBlocks: 1
  });
};

const web3 = getWeb3('rskTestnet');
const gasPrice = getGasPrice('rskTestnet');

//Contract addresses on testnet
const mocContractAddress = '<contract-address>';
const mocInrateAddress = '<contract-address>';
const mocStateAddress = '<contract-address>';
const bproTokenAddress = '<contract-address>';

const execute = async () => {
  web3.eth.defaultGas = 2000000;

  /**
   * Loads an specified contract
   * @param {ContractABI} abi
   * @param {String} contractAddress
   */
  const getContract = async (abi, contractAddress) => new web3.eth.Contract(abi, contractAddress);

  // Loading moc contract
  const moc = await getContract(MocAbi.abi, mocContractAddress);
  if (!moc) {
    throw Error('Can not find MoC contract.');
  }

  // Loading mocState contract. It is necessary to compute absolute max BPRO
  const mocState = await getContract(MoCStateAbi.abi, mocStateAddress);
  if (!mocState) {
    throw Error('Can not find MoCState contract.');
  }

  // Loading BProToken contract. It is necessary to compute user balance
  const bproToken = await getContract(BProTokenAbi.abi, bproTokenAddress);
  if (!bproToken) {
    throw Error('Can not find BProToken contract.');
  }

  const [from] = await web3.eth.getAccounts();

  const redeemBpro = async (bproAmount, vendorAccount) => {
    const weiAmount = web3.utils.toWei(bproAmount, 'ether');

    console.log(`Calling redeem Bpro with account: ${from} and amount: ${weiAmount}.`);
    moc.methods
      .redeemBProVendors(weiAmount, vendorAccount)
      .send({ from, gasPrice }, function(error, transactionHash) {
        if (error) console.log(error);
        if (transactionHash) console.log('txHash: '.concat(transactionHash));
      })
      .on('transactionHash', function(hash) {
        console.log('TxHash: '.concat(hash));
      })
      .on('receipt', function(receipt) {
        console.log(receipt);
      })
      .on('error', console.error);
  };

  const getAbsoluteMaxBpro = await mocState.methods.absoluteMaxBPro().call();
  const userAmount = await bproToken.methods.balanceOf(from).call();

  console.log('=== Max amount of BPro to redeem: ', getAbsoluteMaxBpro.toString());
  console.log('=== User BPro Balance: ', userAmount.toString());

  const bproAmount = '0.00001';
  const vendorAccount = '<vendor-address>';

  // Call redeem
  await redeemBpro(bproAmount, vendorAccount);
};

execute()
  .then(() => console.log('Completed'))
  .catch(err => {
    console.log('Error', err);
  });
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Last updated 3 years ago