In this lesson, we’ll explore how synthetic assets can be integrated with various DeFi protocols by simulating interactions through mock contracts. We’ll build upon the SyntheticAsset contract from the previous lessons and show how it can interact with mock contracts representing Aave, Uniswap, Yearn, and Synthetix protocols.

Mock Aave Protocol Interaction

We’ll create a simplified mock Aave contract to demonstrate depositing our synthetic asset to borrow another asset.

Solidity
solidityCopy code
// MockAave.sol
pragma solidity ^0.8.0;

contract MockAave {
    mapping(address => uint256) public borrowBalance;

    function deposit(address asset, uint256 amount) external returns (bool) {
        // Logic for depositing asset
        return true;
    }

    function borrow(address asset, uint256 amount) external returns (bool) {
        // Logic for borrowing asset
        borrowBalance[msg.sender] += amount;
        return true;
    }
}

In the real world, the Aave protocol has a more complex implementation, but this mock contract gives a simplified idea of how the interaction would occur.

Mock Uniswap Interaction

Next, we’ll create a mock Uniswap contract to demonstrate adding liquidity and performing a trade.

Solidity
// MockUniswap.sol
pragma solidity ^0.8.0;

contract MockUniswap {
    function addLiquidity(
        address assetA,
        address assetB,
        uint256 amountA,
        uint256 amountB
    ) external returns (uint256 liquidity) {
        // Logic for adding liquidity
        return liquidity;
    }

    function swap(
        uint256 amountIn,
        uint256 amountOut,
        address assetIn,
        address assetOut
    ) external returns (bool) {
        // Logic for performing a swap
        return true;
    }
}

Mock Yearn Interaction

Let’s create a mock Yearn vault to demonstrate depositing our synthetic asset to earn returns.

Solidity
// MockYearn.sol
pragma solidity ^0.8.0;

contract MockYearn {
    mapping(address => uint256) public shares;

    function deposit(uint256 amount) external returns (uint256) {
        // Logic for depositing asset
        shares[msg.sender] += amount;
        return shares[msg.sender];
    }
}

Mock Synthetix Interaction

Finally, we’ll demonstrate creating a mock Synthetix contract to mint a new synthetic asset backed by our original synthetic asset.

Solidity
// MockSynthetix.sol
pragma solidity ^0.8.0;

contract MockSynthetix {
    function mint(address asset, uint256 amount) external returns (bool) {
        // Logic for minting a new synthetic asset
        return true;
    }
}

Each of these mock contracts represents a simplified interaction with a DeFi protocol. In real-world scenarios, the contracts would be more complex, and proper permission checks, event emissions, and error handling would be essential.

In the next lesson, we will explore how to ensure the security and efficiency of synthetic asset contracts by debugging and optimizing them. Stay tuned!