CeresDAO借貸合約/DAO質押挖礦系統開發技術丨python技術語言

CeresDAO智慧合約是CeresDAO生態系統的核心，它為使用者提供了穩定幣的發行和管理、抵押和借貸、流動性挖礦等功能。

一些簡單的合約示例，可以為開發者提供啟發，幫助他們更好地瞭解CeresDAO的智慧合約功能。

抵押和借貸合約：CeresDAO智慧合約允許使用者在抵押一定數量的加密資產後獲得借款。使用者必須在一定期限內返還借款，並

支付一定的利息。如果使用者未能如期償還，他們的抵押資產將被收回。

以下是一個簡單的抵押和借貸合約示例：

contract CollateralLoan {

    address public owner;

    uint256 public interestRate;

    mapping (address => uint256) public loanBalances;

    mapping (address => uint256) public collateralBalances;

    mapping (address => bool) public approvedCollaterals;

    event LoanIssued(address indexed borrower, uint256 amount);

    

    constructor(uint256 _interestRate, address _owner) {

        interestRate = _interestRate;

        owner = _owner;

    }

    

    function borrow(uint256 amount, address collateral) public {

        require(amount > 0, "Invalid amount");

        require(collateralBalances[collateral] >= amount, "Insufficient collateral");

        require(approvedCollaterals[collateral] == true, "Collateral is not approved");

        loanBalances[msg.sender] += amount;

        collateralBalances[collateral] -= amount;

        emit LoanIssued(msg.sender, amount);

    }

    

    function repay(uint256 amount) public {

        require(amount > 0, "Invalid amount");

        require(loanBalances[msg.sender] >= amount, "Insufficient loan balance");

        loanBalances[msg.sender] -= amount;

        // TODO: Add interest calculation

    }

    

    function approveCollateral(address collateral) public {

        require(msg.sender == owner, "Only owner can approve collateral");

        approvedCollaterals[collateral] = true;

    }

    

    function revokeCollateralApproval(address collateral) public {

        require(msg.sender == owner, "Only owner can revoke collateral approval");

        approvedCollaterals[collateral] = false;

    }

    

    function depositCollateral(uint256 amount, address collateral) public {

        require(amount > 0, "Invalid amount");

        collateralBalances[collateral] += amount;

    }

    

    function withdrawCollateral(uint256 amount, address collateral) public {

        require(amount > 0, "Invalid amount");

        require(collateralBalances[collateral] >= amount, "Insufficient collateral balance");

        collateralBalances[collateral] -= amount;

    }

    

    function getLoanBalance(address borrower) public view returns (uint256) {

        return loanBalances[borrower];

    }

    

    function getCollateralBalance(address collateral) public view returns (uint256) {

        return collateralBalances[collateral];

    }

}

流動性挖礦合約：CeresDAO智慧合約支援流動性挖礦，允許使用者將穩定幣和其他加密資產提供給交易池，以獲得一定的利息回報。以下是一個簡單的流動性挖礦合約示例：

contract LiquidityMining {

    uint256 public totalLiquidity;

    uint256 public rewardRate;

    uint256 public lastUpdateTime;

    mapping(address => uint256) public liquidityBalances;

    mapping(address => uint256) public rewardBalances;

    

    function addLiquidity(uint256 amount) public {

        require(amount > 0, "Invalid amount");

        liquidityBalances[msg.sender] += amount;

        totalLiquidity += amount;

    }

    

    function removeLiquidity(uint256 amount) public {

        require(amount > 0, "Invalid amount");

        require(liquidityBalances[msg.sender] >= amount, "Insufficient liquidity balance");

        liquidityBalances[msg.sender] -= amount;

        totalLiquidity -= amount;

    }

    

    function claimReward() public {

        uint256 reward = rewardEarned(msg.sender);

        require(reward > 0, "No reward to claim");

        lastUpdateTime = block.timestamp;

        rewardBalances[msg.sender] += reward;

    }

    

    function rewardEarned(address account) public view returns (uint256) {

        uint256 timeElapsed = block.timestamp - lastUpdateTime;

        return liquidityBalances[account] * rewardRate * timeElapsed / totalLiquidity;

    }

    

    function updateRewardRate(uint256 newRate) public {

        rewardBalances[msg.sender] = rewardEarned(msg.sender);

        rewardRate = newRate;

        lastUpdateTime = block.timestamp;

    }

}