362 lines
12 KiB
Solidity
362 lines
12 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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pragma experimental ABIEncoderV2;
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import {IERC20} from "../intf/IERC20.sol";
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import {SafeMath} from "../lib/SafeMath.sol";
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import {DecimalMath} from "../lib/DecimalMath.sol";
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import {InitializableOwnable} from "../lib/InitializableOwnable.sol";
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import {SafeERC20} from "../lib/SafeERC20.sol";
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import {IDODOApproveProxy} from "../SmartRoute/DODOApproveProxy.sol";
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interface IGovernance {
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function getLockedvDODO(address account) external view returns (uint256);
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}
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interface IDODOCirculationHelper {
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// Locked vDOOD not counted in circulation
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function getCirculation() external view returns (uint256);
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function getVDODOWithdrawFeeRatio() external view returns (uint256);
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}
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contract vDODOToken is InitializableOwnable {
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using SafeMath for uint256;
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// ============ Storage(ERC20) ============
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string public name;
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string public symbol;
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uint8 public decimals;
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uint256 public totalSupply;
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mapping(address => mapping(address => uint256)) internal _ALLOWED_;
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// ============ Storage ============
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address immutable _DODO_TOKEN_;
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address immutable _DODO_APPROVE_PROXY_;
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address public _DOOD_GOV_;
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address public _DODO_CIRCULATION_HELPER_;
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bool public _CAN_TRANSFER_;
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// staking reward parameters
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uint256 public dodoPerBlock;
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uint256 public constant _SUPERIOR_RATIO_ = 10**17; // 0.1
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uint256 public dodoFeeBurnRation;
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// accounting
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uint128 public alpha = 100 * 10**18; // 100
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uint128 public lastRewardBlock;
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mapping(address => UserInfo) public userInfo;
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struct UserInfo {
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uint128 VDODOAmount;
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uint128 superiorVDODO;
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address superior;
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uint256 credit;
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}
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// ============ Events ============
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event MintVDODO(address user, address superior, uint256 amount);
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event RedeemVDODO(address user, uint256 amount);
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event SetCantransfer(bool allowed);
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event ChangePerReward(uint256 dodoPerBlock);
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event UpdatedodoFeeBurnRation(uint256 dodoFeeBurnRation);
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event Transfer(address indexed from, address indexed to, uint256 amount);
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event Approval(address indexed owner, address indexed spender, uint256 amount);
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// ============ Modifiers ============
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modifier canTransfer() {
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require(_CAN_TRANSFER_, "vDODOToken: not allowed transfer");
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_;
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}
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modifier balanceEnough(address account, uint256 amount) {
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require(availableBalanceOf(account) >= amount, "vDODOToken: available amount not enough");
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_;
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}
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// ============ Constructor ============
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constructor(
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address dodoGov,
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address dodoToken,
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address dodoCirculationHelper,
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address dodoApproveProxy,
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string memory _name,
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string memory _symbol
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) public {
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name = _name;
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symbol = _symbol;
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decimals = 18;
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_DODO_APPROVE_PROXY_ = dodoApproveProxy;
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_DOOD_GOV_ = dodoGov;
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_DODO_CIRCULATION_HELPER_ = dodoCirculationHelper;
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_DODO_TOKEN_ = dodoToken;
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lastRewardBlock = uint128(block.number);
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}
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// ============ Ownable Functions ============`
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function setCantransfer(bool allowed) public onlyOwner {
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_CAN_TRANSFER_ = allowed;
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emit SetCantransfer(allowed);
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}
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function changePerReward(uint256 _dodoPerBlock) public onlyOwner {
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_updateAlpha();
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dodoPerBlock = _dodoPerBlock;
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emit ChangePerReward(_dodoPerBlock);
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}
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function updatedodoFeeBurnRation(uint256 _dodoFeeBurnRation) public onlyOwner {
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dodoFeeBurnRation = _dodoFeeBurnRation;
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emit UpdatedodoFeeBurnRation(_dodoFeeBurnRation);
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}
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function updateDODOCirculationHelper(address helper) public onlyOwner {
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_DODO_CIRCULATION_HELPER_ = helper;
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}
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function updateGovernance(address governance) public onlyOwner {
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_DOOD_GOV_ = governance;
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}
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function emergencyWithdraw() public onlyOwner {
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uint256 dodoBalance = IERC20(_DODO_TOKEN_).balanceOf(address(this));
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IERC20(_DODO_TOKEN_).transfer(_OWNER_, dodoBalance);
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}
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// ============ Functions ============
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function mint(uint256 dodoAmount, address superiorAddress) public {
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require(superiorAddress != address(0) && superiorAddress != msg.sender, "vDODOToken: Superior INVALID");
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require(dodoAmount > 0, "vDODOToken: must mint greater than 0");
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_updateAlpha();
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IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(
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_DODO_TOKEN_,
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msg.sender,
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address(this),
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dodoAmount
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);
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uint256 newVdodoAmount = DecimalMath.divFloor(dodoAmount, alpha);
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UserInfo storage user = userInfo[msg.sender];
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_mint(user, newVdodoAmount);
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uint256 increSuperiorVDODO = DecimalMath.mulFloor(newVdodoAmount, _SUPERIOR_RATIO_);
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if (user.superior == address(0)) {
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user.superior = superiorAddress;
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}
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_mintToSuperior(user, increSuperiorVDODO);
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emit MintVDODO(msg.sender, superiorAddress, dodoAmount);
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}
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function redeem(uint256 vDodoAmount)
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public
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balanceEnough(msg.sender, vDodoAmount)
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{
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_updateAlpha();
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UserInfo storage user = userInfo[msg.sender];
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_redeem(user, vDodoAmount);
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if (user.superior != address(0)) {
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uint256 superiorRedeemVDODO = DecimalMath.mulFloor(vDodoAmount, _SUPERIOR_RATIO_);
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_redeemFromSuperior(user, superiorRedeemVDODO);
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}
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(uint256 dodoReceive, uint256 burnDodoAmount, uint256 withdrawFeeDodoAmount) = getWithdrawAmount(vDodoAmount);
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IERC20(_DODO_TOKEN_).transfer(msg.sender, dodoReceive);
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if(burnDodoAmount > 0){
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_transfer(address(this), address(0), burnDodoAmount);
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}
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if(withdrawFeeDodoAmount > 0) {
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alpha = uint128(uint256(alpha).add(DecimalMath.divFloor(withdrawFeeDodoAmount, totalSupply)));
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}
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emit RedeemVDODO(msg.sender, vDodoAmount);
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}
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function donate(uint256 dodoAmount) public {
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IDODOApproveProxy(_DODO_APPROVE_PROXY_).claimTokens(
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_DODO_TOKEN_,
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msg.sender,
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address(this),
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dodoAmount
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);
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alpha = uint128(uint256(alpha).add(DecimalMath.divFloor(dodoAmount, totalSupply)));
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}
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// ============ Functions(ERC20) ============
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function balanceOf(address account) public view returns (uint256 balance) {
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UserInfo memory user = userInfo[account];
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balance = uint256(user.VDODOAmount).sub(DecimalMath.divFloor(user.credit, getLatestAlpha()));
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}
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function availableBalanceOf(address account) public view returns (uint256 balance) {
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uint256 lockedBalance = IGovernance(_DOOD_GOV_).getLockedvDODO(account);
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balance = balanceOf(account).sub(lockedBalance);
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}
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function transfer(address to, uint256 amount) public returns (bool) {
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_updateAlpha();
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_transfer(msg.sender, to, amount);
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return true;
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}
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function approve(address spender, uint256 amount) public returns (bool) {
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_ALLOWED_[msg.sender][spender] = amount;
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emit Approval(msg.sender, spender, amount);
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return true;
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}
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) public returns (bool) {
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require(amount <= _ALLOWED_[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
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_updateAlpha();
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_transfer(from, to, amount);
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_ALLOWED_[from][msg.sender] = _ALLOWED_[from][msg.sender].sub(amount);
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emit Transfer(from, to, amount);
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return true;
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}
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function allowance(address owner, address spender) public view returns (uint256) {
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return _ALLOWED_[owner][spender];
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}
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// ============ View Functions ============
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function dodoBalanceOf(address account) public view returns (uint256 dodoAmount) {
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UserInfo memory user = userInfo[account];
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dodoAmount = DecimalMath.mulFloor(uint256(user.VDODOAmount),getLatestAlpha()).sub(user.credit);
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}
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function getLatestAlpha() public view returns(uint256) {
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uint256 accuDODO = dodoPerBlock * (block.number - lastRewardBlock);
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if (totalSupply > 0) {
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return uint256(alpha).add(DecimalMath.divFloor(accuDODO, totalSupply));
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} else {
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return alpha;
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}
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}
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function getWithdrawAmount(uint256 vDodoAmount) public view returns(uint256 dodoReceive, uint256 burnDodoAmount, uint256 withdrawFeeDodoAmount) {
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uint256 feeRatio = IDODOCirculationHelper(_DODO_CIRCULATION_HELPER_).getVDODOWithdrawFeeRatio();
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uint256 newAlpha = getLatestAlpha();
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uint256 withdrawDodoAmount = DecimalMath.mulFloor(vDodoAmount, newAlpha);
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withdrawFeeDodoAmount = DecimalMath.mulCeil(withdrawDodoAmount, feeRatio);
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dodoReceive = withdrawDodoAmount.sub(withdrawFeeDodoAmount);
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if(dodoFeeBurnRation > 0){
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burnDodoAmount = DecimalMath.mulFloor(withdrawFeeDodoAmount,dodoFeeBurnRation);
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withdrawFeeDodoAmount = withdrawFeeDodoAmount.sub(burnDodoAmount);
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}else {
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burnDodoAmount = 0;
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}
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}
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// ============ Internal Functions ============
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function _updateAlpha() internal {
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uint256 newAlpha = getLatestAlpha();
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require(newAlpha <= uint128(-1), "OVERFLOW");
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alpha = uint128(newAlpha);
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lastRewardBlock = uint128(block.number);
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}
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function _mint(UserInfo storage to, uint256 vdodoAmount) internal {
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require(vdodoAmount <= uint128(-1), "OVERFLOW");
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to.VDODOAmount = uint128(uint256(to.VDODOAmount).add(vdodoAmount));
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totalSupply = totalSupply.add(vdodoAmount);
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}
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function _mintToSuperior(UserInfo storage user, uint256 vdodoAmount) internal {
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if (vdodoAmount > 0) {
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user.superiorVDODO = uint128(uint256(user.superiorVDODO).add(vdodoAmount));
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UserInfo storage superiorUser = userInfo[user.superior];
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_mint(superiorUser, vdodoAmount);
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uint256 dodoAmount = DecimalMath.mulCeil(vdodoAmount, alpha);
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superiorUser.credit = superiorUser.credit.add(dodoAmount);
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}
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}
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function _redeem(UserInfo storage from, uint256 vdodoAmount) internal {
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from.VDODOAmount = uint128(uint256(from.VDODOAmount).sub(vdodoAmount));
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totalSupply = totalSupply.sub(vdodoAmount);
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}
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function _redeemFromSuperior(UserInfo storage user, uint256 vdodoAmount) internal {
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if (vdodoAmount > 0) {
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vdodoAmount = user.superiorVDODO <= vdodoAmount ? user.superiorVDODO : vdodoAmount;
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user.superiorVDODO = uint128(uint256(user.superiorVDODO).sub(vdodoAmount));
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UserInfo storage superiorUser = userInfo[user.superior];
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uint256 creditVDODO = DecimalMath.divFloor(superiorUser.credit, alpha);
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if (vdodoAmount >= creditVDODO) {
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superiorUser.credit = 0;
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_redeem(superiorUser, creditVDODO);
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} else {
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superiorUser.credit = superiorUser.credit.sub(
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DecimalMath.mulFloor(vdodoAmount, alpha)
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);
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_redeem(superiorUser, vdodoAmount);
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}
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}
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}
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function _transfer(
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address from,
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address to,
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uint256 _amount
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) internal balanceEnough(from, _amount) canTransfer {
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require(from != address(0), "transfer from the zero address");
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require(to != address(0), "transfer to the zero address");
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UserInfo storage fromUser = userInfo[from];
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fromUser.VDODOAmount = uint128(uint256(fromUser.VDODOAmount).sub(_amount));
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UserInfo storage toUser = userInfo[to];
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toUser.VDODOAmount = uint128(uint256(toUser.VDODOAmount).add(_amount));
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uint256 superiorRedeemVDODO = DecimalMath.mulFloor(_amount, _SUPERIOR_RATIO_);
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if (fromUser.superior != address(0)) {
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_redeemFromSuperior(fromUser, superiorRedeemVDODO);
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}
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if (toUser.superior != address(0)) {
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_mintToSuperior(toUser, superiorRedeemVDODO);
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}
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emit Transfer(from, to, _amount);
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}
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}
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