Example code redeeming all DOC

In the following example we will show how to invoke redeemAllDoc using Money on Chain contract. As a condition to do this the MoC contract must be paused(). Check the DOC redeemption section for more details.

We will use truffle and testnet network. You can find code examples into /examples dir.

First we create a new node project.

mkdir example-redeem-all-doc
cd example-redeem-all-doc
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 MoC = require('../../build/contracts/MoC.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');

// Loading MoC address on testnet
const mocAddress = '<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(MoC.abi, mocAddress);
  if (!moc) {
    throw Error('Can not find MoC contract.');
  }


  const redeemAllDoc = async () => {
    const [from] = await web3.eth.getAccounts();

    console.log(`Calling redeem all Doc.`);
    moc.methods
      .redeemAllDoc()
      .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);
  };

  // Call redeem
  await redeemAllDoc();
};

execute()
  .then(() => console.log('Completed'))
  .catch(err => {
    console.log('Error', err);
  });