Main Contract
  • Introduction
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      • User actions
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      • MoC
      • CommissionSplitter
      • MoCState
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      • MoCConverter
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      • MoCConnector
      • MoCBProxManager
      • MoCInrate
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    • Contract mocks
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  • Integration with MoC platform
    • Introduction to MoC
      • The MoC Contract
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    • 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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  1. Integration with MoC platform
  2. From outside the blockchain

Example code redeeming BPros without Truffle

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 the 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
npm install --save truffle-hdwallet-provider
const HDWalletProvider = require('truffle-hdwallet-provider');
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 MoCInrateAbi = require('../../build/contracts/MoCInrate.json');
const MoCStateAbi = require('../../build/contracts/MoCState.json');
const BProTokenAbi = require('../../build/contracts/BProToken.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 mocStateAddress = '<contract-address>';
const bproTokenAddress = '<contract-address>';
const gasPrice = 60000000;

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 mocInrate contract. It is necessary to compute commissions
  const mocInrate = await getContract(MoCInrateAbi.abi, mocInrateAddress);
  if (!mocInrate) {
    throw Error('Can not find MoC Inrate 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);

  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();
  const bproFinalAmount = Math.min(userAmount, getAbsoluteMaxBpro);
  console.log('=== User BPRO balance: ', userAmount);
  console.log('=== Max amount of BPro to redeem ', bproFinalAmount);

  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