EthHW

Ethereum teaching materials HW2 for NTUEE Networking and Multimedia Lab (EE3002)

Prequisites

node.js, npm, ganache-cli(or ganache), truffle, Metamask(browser add-ons)

~ $ sudo apt install nodejs
~ $ sudo apt install npm
~ $ npm install -g ganache-cli
~ $ npm install -g truffle

Quick start

~ $ git clone https://github.com/Vimalakirti/EthHW.git
~ $ cd EthHW/

Table of contents

• 1_Hello: basic solidity development
• 2_Coin: ERC and testing
• 3_TodoApp: Web3 and frontend

Notice

1. If your os is not Windows, please rename truffle-config.js to truffle.js, or just run the following command:

~ $ bash rename.sh

2. Remember to run ganache on developing.
3. Step-by-step

HWs

Please describe how you get the point(s) in your report.

1_Hello

~ $ cd 1_Hello/

• (1%) Compile the contracts
• Modify truffle-config.js(or truffle.js)
• (1%) Migrate the contracts
• Run truffle console
• (1%) Get the message:
• Change your name, we hold Vimalakirti up as an example here,
• (1%) And get the message:

2_Coin

~ $ cd 2_Coin/
~ $ npm install @openzeppelin/contracts@^2.4.0

• Google "ERC20" first
• And you might need this doc: https://docs.openzeppelin.com/contracts/2.x/api/token/erc20#erc20
• Compile the contracts
• Modify truffle-config.js(or truffle.js)
• Migrate the contracts
• Write your test script(solidity or javascript)
• (4%) Test the functions below:
  • totalSupply() - I've done for you
  • balanceOf(account) - I've done for you
  • transfer(recipient, amount) - TODO
  • allowance(owner, spender) - TODO
  • approve(spender, amount) - TODO
  • transferFrom(sender, recipient, amount) - TODO
• You should test these functionalities comprehensively and get "passing" by running truffle test

3_TodoApp

~ $ cd 3_TodoApp/

• Compile and migrate the contracts (remember to check truffle-config.js or truffle.js)
• mv build react/src/
• cd react and run npm install, then run npm run start
• Open your browser and enter localhost:3000 in the URL bar
• (4%) Realize web3 functions below (react/src/index.js line 55~85):
  • addTodo
  • deleteTodo
  • completeTodo
  • undoneTodo
• Metamask should pop up on using these functions