FlashLoan

FlashLoan.sol

pragma solidity ^0.5.0;

import "openzeppelin-solidity/contracts/math/SafeMath.sol";

import "../../flashloan/base/FlashLoanReceiverBase.sol";
import "../../configuration/LendingPoolAddressesProvider.sol";
import "../../lendingpool/LendingPool.sol";

contract FlashLoanReceiverExample is FlashLoanReceiverBase {

    using SafeMath for uint256;
    
    LendingPoolAddressesProvider provider;
    address chainlink;

    constructor(LendingPoolAddressesProvider _provider, address _chainlink)
        FlashLoanReceiverBase(_provider)
        public
    {
        provider = LendingPoolAddressesProvider(_provider);
        chainlink = _chainlink;
    }

    function initLoan(uint256 _amount, bytes calldata params) public {
        LendingPool lendingPool = lendingPool(provider.getLendingPool());
        lendingPool.flashLoan(address(this), chainlink, _amount, _params);
    }
  
    function executeOperation(
        address _reserve,
        uint256 _amount,
        uint256 _fee,
        bytes memory _params) external {

        //check the contract has the specified balance
        require(_amount <= getBalanceInternal(address(this), _reserve), 
            "Invalid balance for the contract");

        // Buy from exchange A 💰
        
        // Sell on exchange B 💱
          
        // PROFIT!!! 🤑🤑🤑🚀🎉
        
        transferFundsBackToPoolInternal(_reserve, _amount.add(_fee));
    }
}