03-confirm-transaction.md

Confirm Transaction

1. Checkout the exercise

git checkout exercise-03

2. Exercise

Write your code inside contracts/MultiSigWallet.sol

Complete the confirmTransaction function

function confirmTransaction(uint _txIndex)
    public
    onlyOwner
    txExists(_txIndex)
    notExecuted(_txIndex)
    notConfirmed(_txIndex)
{

}

• Complete the modifier txExists
  • it should require that the transaction at txIndex exists
• Complete the modifier notExecuted
  • it should require that the transaction at txIndex is not yet executed
• Complete the modifier notConfirmed
  • it should require that the transaction at txIndex is not yet confirmed by msg.sender
• Confirm the transaction
  • update the isConfirmed to true for msg.sender
  • increment numConfirmation by 1
  • emit ConfirmTransaction event for the transaction being confirmed

event ConfirmTransaction(address indexed owner, uint indexed txIndex);

3. Test

Test your code

npm test

4. Solution

git checkout exercise-03-solution