eth以太坊sushi合约源码开发

- 日理万妓 2022-12-06 12:40 316阅读 0赞

# 以太坊或波场sushiy合约源码开发 #

1：官网：[https://sushiswap.org/][https_sushiswap.org]

2：部分合约源码浏览

pragma solidity 0.6.12;
    
    
    import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
    import "@openzeppelin/contracts/access/Ownable.sol";
    
    
    // SushiToken with Governance.
    contract SushiToken is ERC20("SushiToken", "SUSHI"), Ownable {
        /// @notice Creates `_amount` token to `_to`. Must only be called by the owner (MasterChef).
        function mint(address _to, uint256 _amount) public onlyOwner {
            _mint(_to, _amount);
            _moveDelegates(address(0), _delegates[_to], _amount);
        }
    
        // Copied and modified from YAM code:
        // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernanceStorage.sol
        // https://github.com/yam-finance/yam-protocol/blob/master/contracts/token/YAMGovernance.sol
        // Which is copied and modified from COMPOUND:
        // https://github.com/compound-finance/compound-protocol/blob/master/contracts/Governance/Comp.sol
    
        /// @notice A record of each accounts delegate
        mapping (address => address) internal _delegates;
    
        /// @notice A checkpoint for marking number of votes from a given block
        struct Checkpoint {
            uint32 fromBlock;
            uint256 votes;
        }
    
        /// @notice A record of votes checkpoints for each account, by index
        mapping (address => mapping (uint32 => Checkpoint)) public checkpoints;
    
        /// @notice The number of checkpoints for each account
        mapping (address => uint32) public numCheckpoints;
    
        /// @notice The EIP-712 typehash for the contract's domain
        bytes32 public constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)");
    
        /// @notice The EIP-712 typehash for the delegation struct used by the contract
        bytes32 public constant DELEGATION_TYPEHASH = keccak256("Delegation(address delegatee,uint256 nonce,uint256 expiry)");
    
        /// @notice A record of states for signing / validating signatures
        mapping (address => uint) public nonces;
    
          /// @notice An event thats emitted when an account changes its delegate
        event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
    
        /// @notice An event thats emitted when a delegate account's vote balance changes
        event DelegateVotesChanged(address indexed delegate, uint previousBalance, uint newBalance);
    
        /**
         * @notice Delegate votes from `msg.sender` to `delegatee`
         * @param delegator The address to get delegatee for
         */
        function delegates(address delegator)
            external
            view
            returns (address)
        {
            return _delegates[delegator];
        }
    
       /**
        * @notice Delegate votes from `msg.sender` to `delegatee`
        * @param delegatee The address to delegate votes to
        */
        function delegate(address delegatee) external {
            return _delegate(msg.sender, delegatee);
        }
    
        /**
         * @notice Delegates votes from signatory to `delegatee`
         * @param delegatee The address to delegate votes to
         * @param nonce The contract state required to match the signature
         * @param expiry The time at which to expire the signature
         * @param v The recovery byte of the signature
         * @param r Half of the ECDSA signature pair
         * @param s Half of the ECDSA signature pair
         */
        function delegateBySig(
            address delegatee,
            uint nonce,
            uint expiry,
            uint8 v,
            bytes32 r,
            bytes32 s
        )
            external
        {
            bytes32 domainSeparator = keccak256(
                abi.encode(
                    DOMAIN_TYPEHASH,
                    keccak256(bytes(name())),
                    getChainId(),
                    address(this)
                )
            );
    
            bytes32 structHash = keccak256(
                abi.encode(
                    DELEGATION_TYPEHASH,
                    delegatee,
                    nonce,
                    expiry
                )
            );
    
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    domainSeparator,
                    structHash
                )
            );
    
            address signatory = ecrecover(digest, v, r, s);
            require(signatory != address(0), "SUSHI::delegateBySig: invalid signature");
            require(nonce == nonces[signatory]++, "SUSHI::delegateBySig: invalid nonce");
            require(now <= expiry, "SUSHI::delegateBySig: signature expired");
            return _delegate(signatory, delegatee);
        }
    
        /**
         * @notice Gets the current votes balance for `account`
         * @param account The address to get votes balance
         * @return The number of current votes for `account`
         */
        function getCurrentVotes(address account)
            external
            view
            returns (uint256)
        {
            uint32 nCheckpoints = numCheckpoints[account];
            return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
        }
    
        /**
         * @notice Determine the prior number of votes for an account as of a block number
         * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
         * @param account The address of the account to check
         * @param blockNumber The block number to get the vote balance at
         * @return The number of votes the account had as of the given block
         */
        function getPriorVotes(address account, uint blockNumber)
            external
            view
            returns (uint256)
        {
            require(blockNumber < block.number, "SUSHI::getPriorVotes: not yet determined");
    
            uint32 nCheckpoints = numCheckpoints[account];
            if (nCheckpoints == 0) {
                return 0;
            }
    
            // First check most recent balance
            if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
                return checkpoints[account][nCheckpoints - 1].votes;
            }
    
            // Next check implicit zero balance
            if (checkpoints[account][0].fromBlock > blockNumber) {
                return 0;
            }
    
            uint32 lower = 0;
            uint32 upper = nCheckpoints - 1;
            while (upper > lower) {
                uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
                Checkpoint memory cp = checkpoints[account][center];
                if (cp.fromBlock == blockNumber) {
                    return cp.votes;
                } else if (cp.fromBlock < blockNumber) {
                    lower = center;
                } else {
                    upper = center - 1;
                }
            }
            return checkpoints[account][lower].votes;
        }
    
        function _delegate(address delegator, address delegatee)
            internal
        {
            address currentDelegate = _delegates[delegator];
            uint256 delegatorBalance = balanceOf(delegator); // balance of underlying SUSHIs (not scaled);
            _delegates[delegator] = delegatee;
    
            emit DelegateChanged(delegator, currentDelegate, delegatee);
    
            _moveDelegates(currentDelegate, delegatee, delegatorBalance);
        }
    
        function _moveDelegates(address srcRep, address dstRep, uint256 amount) internal {
            if (srcRep != dstRep && amount > 0) {
                if (srcRep != address(0)) {
                    // decrease old representative
                    uint32 srcRepNum = numCheckpoints[srcRep];
                    uint256 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                    uint256 srcRepNew = srcRepOld.sub(amount);
                    _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
                }
    
                if (dstRep != address(0)) {
                    // increase new representative
                    uint32 dstRepNum = numCheckpoints[dstRep];
                    uint256 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                    uint256 dstRepNew = dstRepOld.add(amount);
                    _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
                }
            }
        }
    
        function _writeCheckpoint(
            address delegatee,
            uint32 nCheckpoints,
            uint256 oldVotes,
            uint256 newVotes
        )
            internal
        {
            uint32 blockNumber = safe32(block.number, "SUSHI::_writeCheckpoint: block number exceeds 32 bits");
    
            if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
                checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
            } else {
                checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
                numCheckpoints[delegatee] = nCheckpoints + 1;
            }
    
            emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
        }
    
        function safe32(uint n, string memory errorMessage) internal pure returns (uint32) {
            require(n < 2**32, errorMessage);
            return uint32(n);
        }
    
        function getChainId() internal pure returns (uint) {
            uint256 chainId;
            assembly { chainId := chainid() }
            return chainId;
        }
    }

3：完整sushi源码下载地址：[https://github.com/sushiswap/sushiswap/tree/master/contracts][https_github.com_sushiswap_sushiswap_tree_master_contracts]

[https_sushiswap.org]: https://sushiswap.org/
[https_github.com_sushiswap_sushiswap_tree_master_contracts]: https://github.com/sushiswap/sushiswap/tree/master/contracts