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Kitty Browser

CryptoKitties is one of the most popular distributed apps on the Ethereum Network. It's a game that allows players to purchase, collect, breed and sell various types of virtual cats.

To be able to run CryptoKitties on your browser you'll need to install Metamask or use a dedicated Ethereum browser like Mist or Parity.

For this challenge you will create a simple UI that will be able to interact with the Ethereum Blockchain, using web3.js and the drizzle library. This UI will allow the user to type in a CryptoKitty's ID, and will display information about that Kitty.

Requirements to complete this challenge

  • Use the code provided in this repo as a starting point to build your solution
  • Given the address for the CryptoKitties Smart Contract: 0x06012c8cf97bead5deae237070f9587f8e7a266d Find its ABI (You will need it to complete the challenge)
  • Build a simple UI where the user can type in an ID and display the following information about a Kitty:
    • Genes
    • Birth time
    • Generation
  • Write a unit test that you consider relevant, using the unit test framework of your preference. It should run using npm run test
  • You will get extra points if you use react-testing-library 🏅
  • You will get extra points if you also display the Kitty's picture. 🏅
  • You will get extra points if you create a "Fetch random Kitty" button. 🏅
  • You will get extra points if you use TypeScript 🏅
  • Feel free to customize the styles as you wish or use any extra libraries that you need

The result should look somethig like this:

kitty browser

Hints

  • You will need to use the drizzle instance available on React's context (See components/Browser.js)
  • You will need to explore the smart contract methods to find out which one will get you the kitty's info (This operation won't require spending any ether)

Setting up your dev environment

  • Install and setup Metamask in your browser
  • Clone this repo, to be used as a starting point for your solution
  • Install the dependencies and run the development server

Code Overview

This repo contains a few components that will be useful for you to complete this project. These components are based on the drizzle-react examples

containers/Loading.js

Shows a Loading message while drizzle is being initialized or an error message if the browser is not web3 enabled

if (window.web3 === undefined || this.props.web3.status === 'failed') {
      return(
        // Display a web3 warning.
        <div className="warning">
          <p>This browser has no connection to the Ethereum network. </p>
          <p>Please use the Chrome/FireFox extension MetaMask, or dedicated Ethereum browsers Mist or Parity.</p>
        </div>
      );
    }

    if (this.props.drizzleStatus.initialized) {
      // Load the dapp.
      return Children.only(this.props.children);
    }

    return(
      // Display a loading indicator.
      <div className="loading">
        <h1>Loading dapp...</h1>
        <img src="https://www.cryptokitties.co/images/loader.gif" width="120" alt="loading" />
      </div>
    );

App.js

Initializes the DrizzleProvider and wraps your app with the Loading component.

class App extends Component {
  render() {
    const drizzleOptions = {
      contracts: []
    };

    return (
      <DrizzleProvider options={drizzleOptions}>
        <Loading>
          <Browser />
        </Loading>
      </DrizzleProvider>
    );
  }
}

components/Browser.js

Once you have the Smart Contract's ABI, uncomment the lines you need to add the contract to the drizzle store, and start building your solution.

Questions or comments

For any questions or comments please contact Dragos Rizescu <[email protected]> or Ruben Torres <[email protected]>