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Harvest | 126242358 | 42 hrs ago | IN | 0 ETH | 0.000000677765 | ||||
Harvest | 125925948 | 9 days ago | IN | 0 ETH | 0.000020624332 | ||||
Harvest | 125615942 | 16 days ago | IN | 0 ETH | 0.000003995636 | ||||
Harvest | 125304874 | 23 days ago | IN | 0 ETH | 0.000000096544 | ||||
Harvest | 124968734 | 31 days ago | IN | 0 ETH | 0.00000033576 | ||||
Harvest | 124604866 | 39 days ago | IN | 0 ETH | 0.000001560555 | ||||
Harvest | 124279405 | 47 days ago | IN | 0 ETH | 0.000000505009 | ||||
Harvest | 123975678 | 54 days ago | IN | 0 ETH | 0.000000108044 | ||||
Harvest | 123655793 | 61 days ago | IN | 0 ETH | 0.000000417782 | ||||
Harvest | 123307396 | 69 days ago | IN | 0 ETH | 0.000000650894 | ||||
Harvest | 122987323 | 77 days ago | IN | 0 ETH | 0.000076024058 | ||||
Harvest | 122725158 | 83 days ago | IN | 0 ETH | 0.000000433023 | ||||
Harvest | 122445632 | 89 days ago | IN | 0 ETH | 0.000073382711 | ||||
Harvest | 122074781 | 98 days ago | IN | 0 ETH | 0.000000513231 | ||||
Harvest | 121923050 | 101 days ago | IN | 0 ETH | 0.000004966554 | ||||
Harvest | 121793187 | 104 days ago | IN | 0 ETH | 0.00006457151 | ||||
Harvest | 121660604 | 107 days ago | IN | 0 ETH | 0.000079571686 | ||||
Harvest | 121532599 | 110 days ago | IN | 0 ETH | 0.000063459145 | ||||
Harvest | 121429631 | 113 days ago | IN | 0 ETH | 0.000000927814 | ||||
Harvest | 121322366 | 115 days ago | IN | 0 ETH | 0.000002998836 | ||||
Harvest | 121192976 | 118 days ago | IN | 0 ETH | 0.000071208967 | ||||
Harvest | 121080279 | 121 days ago | IN | 0 ETH | 0.000068430909 | ||||
Harvest | 121000841 | 123 days ago | IN | 0 ETH | 0.000071464741 | ||||
Harvest | 120913338 | 125 days ago | IN | 0 ETH | 0.00006877866 | ||||
Harvest | 120825492 | 127 days ago | IN | 0 ETH | 0.000002020666 |
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Minimal Proxy Contract for 0xe92045fad15d719d7b3126585c23b7c0d70e881d
Contract Name:
StrategyVelodromeFactoryClonable
Compiler Version
v0.8.15+commit.e14f2714
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: AGPL-3.0 pragma solidity ^0.8.15; // These are the core Yearn libraries import "@openzeppelin/contracts/utils/math/Math.sol"; import "https://github.com/yearn/yearn-vaults/blob/v0.4.6/contracts/BaseStrategy.sol"; interface IVelodromeRouter { struct Routes { address from; address to; bool stable; address factory; } function addLiquidity( address, address, bool, uint256, uint256, uint256, uint256, address, uint256 ) external returns (uint256 amountA, uint256 amountB, uint256 liquidity); function swapExactTokensForTokens( uint256 amountIn, uint256 amountOutMin, Routes[] memory routes, address to, uint256 deadline ) external returns (uint256[] memory amounts); function quoteStableLiquidityRatio( address token0, address token1, address factory ) external view returns (uint256 ratio); } interface IVelodromeGauge { function deposit(uint256 amount) external; function balanceOf(address) external view returns (uint256); function withdraw(uint256 amount) external; function getReward(address account) external; function earned(address account) external view returns (uint256); function stakingToken() external view returns (address); } interface IVelodromePool { function stable() external view returns (bool); function token0() external view returns (address); function token1() external view returns (address); function factory() external view returns (address); function getAmountOut( uint256 amountIn, address tokenIn ) external view returns (uint256 amount); } interface IDetails { // get details from velodrome function name() external view returns (string memory); function symbol() external view returns (string memory); } contract StrategyVelodromeFactoryClonable is BaseStrategy { using SafeERC20 for IERC20; /* ========== STATE VARIABLES ========== */ /// @notice Velodrome gauge contract IVelodromeGauge public gauge; /// @notice Velodrome v2 router contract IVelodromeRouter public constant router = IVelodromeRouter(0xa062aE8A9c5e11aaA026fc2670B0D65cCc8B2858); /// @notice The percentage of VELO from each harvest that we send to our voter (out of 10,000). uint256 public localKeepVELO; /// @notice The address of our Velodrome voter. This is where we send any keepVELO. address public veloVoter; // this means all of our fee values are in basis points uint256 internal constant FEE_DENOMINATOR = 10000; /// @notice The address of our base token (VELO v2) IERC20 public constant velo = IERC20(0x9560e827aF36c94D2Ac33a39bCE1Fe78631088Db); /// @notice Token0 in our pool. IERC20 public poolToken0; /// @notice Token1 in our pool. IERC20 public poolToken1; /// @notice Factory address that deployed our Velodrome pool. address public factory; /// @notice True if our pool is stable, false if volatile. bool public isStablePool; /// @notice Array of structs containing our swap route to go from VELO to token0. /// @dev Struct is from token, to token, and true/false for stable/volatile. IVelodromeRouter.Routes[] public swapRouteForToken0; /// @notice Array of structs containing our swap route to go from VELO to token1. /// @dev Struct is from token, to token, and true/false for stable/volatile. IVelodromeRouter.Routes[] public swapRouteForToken1; /// @notice Minimum profit size in USDC that we want to harvest. /// @dev Only used in harvestTrigger. uint256 public harvestProfitMinInUsdc; /// @notice Maximum profit size in USDC that we want to harvest (ignore gas price once we get here). /// @dev Only used in harvestTrigger. uint256 public harvestProfitMaxInUsdc; /// @notice Will only be true on the original deployed contract and not on clones; we don't want to clone a clone. bool public isOriginal = true; // we use this to be able to adjust our strategy's name string internal stratName; /* ========== CONSTRUCTOR ========== */ constructor( address _vault, address _gauge, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken0, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken1 ) BaseStrategy(_vault) { _initializeStrat( _gauge, _veloSwapRouteForToken0, _veloSwapRouteForToken1 ); } /* ========== CLONING ========== */ event Cloned(address indexed clone); /// @notice Use this to clone an exact copy of this strategy on another vault. /// @dev In practice, this will only be called by the factory on the template contract. /// @param _vault Vault address we are targeting with this strategy. /// @param _strategist Address to grant the strategist role. /// @param _rewards If we have any strategist rewards, send them here. /// @param _keeper Address to grant the keeper role. /// @param _gauge Gauge address for this strategy. /// @param _veloSwapRouteForToken0 Array of structs containing our swap route to go from VELO to token0. /// @param _veloSwapRouteForToken1 Array of structs containing our swap route to go from VELO to token1. /// @return newStrategy Address of our new cloned strategy. function cloneStrategyVelodrome( address _vault, address _strategist, address _rewards, address _keeper, address _gauge, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken0, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken1 ) external returns (address newStrategy) { // don't clone a clone if (!isOriginal) { revert(); } // Copied from https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol bytes20 addressBytes = bytes20(address(this)); assembly { // EIP-1167 bytecode let clone_code := mload(0x40) mstore( clone_code, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000 ) mstore(add(clone_code, 0x14), addressBytes) mstore( add(clone_code, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000 ) newStrategy := create(0, clone_code, 0x37) } StrategyVelodromeFactoryClonable(newStrategy).initialize( _vault, _strategist, _rewards, _keeper, _gauge, _veloSwapRouteForToken0, _veloSwapRouteForToken1 ); emit Cloned(newStrategy); } /// @notice Initialize the strategy. /// @dev This should only be called by the clone function above. /// @param _vault Vault address we are targeting with this strategy. /// @param _strategist Address to grant the strategist role. /// @param _rewards If we have any strategist rewards, send them here. /// @param _keeper Address to grant the keeper role. /// @param _gauge Gauge address for this strategy. /// @param _veloSwapRouteForToken0 Array of structs containing our swap route to go from VELO to token0. /// @param _veloSwapRouteForToken1 Array of structs containing our swap route to go from VELO to token1. function initialize( address _vault, address _strategist, address _rewards, address _keeper, address _gauge, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken0, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken1 ) public { _initialize(_vault, _strategist, _rewards, _keeper); _initializeStrat( _gauge, _veloSwapRouteForToken0, _veloSwapRouteForToken1 ); } // this is called by our original strategy, as well as any clones function _initializeStrat( address _gauge, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken0, IVelodromeRouter.Routes[] memory _veloSwapRouteForToken1 ) internal { // make sure that we haven't initialized this before if (address(gauge) != address(0)) { revert("already initialized"); } // gauge, giver of life and VELO gauge = IVelodromeGauge(_gauge); // make sure we have the right gauge for our want if (gauge.stakingToken() != address(want)) { revert("gauge pool mismatch"); } // check our pool to see if it is stable or volatile, get pool tokens as well (pool = want) IVelodromePool pool = IVelodromePool(address(want)); isStablePool = pool.stable(); poolToken0 = IERC20(pool.token0()); poolToken1 = IERC20(pool.token1()); factory = pool.factory(); // create our route state vars for (uint i; i < _veloSwapRouteForToken0.length; ++i) { swapRouteForToken0.push(_veloSwapRouteForToken0[i]); } for (uint i; i < _veloSwapRouteForToken1.length; ++i) { swapRouteForToken1.push(_veloSwapRouteForToken1[i]); } // check to make sure our routes are reasonably correct if (address(poolToken0) != address(velo)) { if ( swapRouteForToken0[0].from != address(velo) || address(poolToken0) != swapRouteForToken0[_veloSwapRouteForToken0.length - 1].to ) { revert("token0 route error"); } } if (address(poolToken1) != address(velo)) { if ( swapRouteForToken1[0].from != address(velo) || address(poolToken1) != swapRouteForToken1[_veloSwapRouteForToken1.length - 1].to ) { revert("token1 route error"); } } // set up our baseStrategy vars maxReportDelay = 30 days; creditThreshold = 50_000e18; harvestProfitMinInUsdc = 1_000e6; harvestProfitMaxInUsdc = 100_000e6; // want = Velodrome LP/pool want.approve(_gauge, type(uint256).max); poolToken0.safeApprove(address(router), type(uint256).max); poolToken1.safeApprove(address(router), type(uint256).max); velo.approve(address(router), type(uint256).max); // set our strategy's name stratName = string( abi.encodePacked( "StrategyVelodromeFactory-", IDetails(address(want)).symbol() ) ); } /* ========== VIEWS ========== */ /// @notice Strategy name. function name() external view override returns (string memory) { return stratName; } /// @notice Balance of want staked in Velodrome's gauge. function stakedBalance() public view returns (uint256) { return gauge.balanceOf(address(this)); } /// @notice Balance of want sitting in our strategy. function balanceOfWant() public view returns (uint256) { return want.balanceOf(address(this)); } /// @notice Total assets the strategy holds, sum of loose and staked want. function estimatedTotalAssets() public view override returns (uint256) { return balanceOfWant() + stakedBalance(); } /// @notice Claimable VELO rewards. We use this for triggering harvests. function claimableRewards() public view returns (uint256) { return gauge.earned(address(this)); } /// @notice Use this to check our current swap route of VELO to token0. /// @dev Since this is a factory, users may set non-optimal paths or liquidity may change over time. /// @return Array of tokens we swap through. function veloRouteToToken0() external view returns (address[] memory) { IVelodromeRouter.Routes[] memory _route = swapRouteForToken0; return _veloToRoute(_route); } /// @notice Use this to check our current swap route of VELO to token1. /// @dev Since this is a factory, users may set non-optimal paths or liquidity may change over time. /// @return Array of tokens we swap through. function veloRouteToToken1() external view returns (address[] memory) { IVelodromeRouter.Routes[] memory _route = swapRouteForToken1; return _veloToRoute(_route); } /// @dev Credit to beefy for this useful helper function, 0xd0B6809f9b6FdeC41280e0C843B4C232425d8015, MIT license function _veloToRoute( IVelodromeRouter.Routes[] memory _route ) internal pure returns (address[] memory) { address[] memory route = new address[](_route.length + 1); route[0] = _route[0].from; for (uint i; i < _route.length; ++i) { route[i + 1] = _route[i].to; } return route; } /* ========== CORE STRATEGY FUNCTIONS ========== */ function prepareReturn( uint256 _debtOutstanding ) internal override returns (uint256 _profit, uint256 _loss, uint256 _debtPayment) { // harvest no matter what gauge.getReward(address(this)); uint256 veloBalance = velo.balanceOf(address(this)); // by default this is zero, but if we want any for our voter this will be used uint256 _localKeepVELO = localKeepVELO; address _veloVoter = veloVoter; if (_localKeepVELO > 0 && _veloVoter != address(0)) { uint256 sendToVoter; unchecked { sendToVoter = (veloBalance * _localKeepVELO) / FEE_DENOMINATOR; } if (sendToVoter > 0) { velo.safeTransfer(_veloVoter, sendToVoter); } veloBalance = velo.balanceOf(address(this)); } // don't bother if we don't get at least 10 VELO if (veloBalance > 10e18) { // sell rewards for more want, have to add from both sides. uint256 amountToSwapToken0 = veloBalance / 2; uint256 amountToSwapToken1 = veloBalance - amountToSwapToken0; // if stable, do some more fancy math, not as easy as swapping half if (isStablePool) { uint256 ratio = router.quoteStableLiquidityRatio( address(poolToken0), address(poolToken1), factory ); amountToSwapToken1 = (veloBalance * ratio) / 1e18; amountToSwapToken0 = veloBalance - amountToSwapToken1; } if (address(poolToken0) != address(velo)) { router.swapExactTokensForTokens( amountToSwapToken0, 0, swapRouteForToken0, address(this), block.timestamp ); } if (address(poolToken1) != address(velo)) { router.swapExactTokensForTokens( amountToSwapToken1, 0, swapRouteForToken1, address(this), block.timestamp ); } // check and see what we have after swaps uint256 balanceToken0 = poolToken0.balanceOf(address(this)); uint256 balanceToken1 = poolToken1.balanceOf(address(this)); // deposit our liquidity, should have minimal remaining in strategy after this router.addLiquidity( address(poolToken0), address(poolToken1), isStablePool, balanceToken0, balanceToken1, 0, 0, address(this), block.timestamp ); } // serious loss should never happen, but if it does (for instance, if Ramses is hacked), let's record it accurately uint256 assets = estimatedTotalAssets(); uint256 debt = vault.strategies(address(this)).totalDebt; // if assets are greater than debt, things are working great! if (assets >= debt) { unchecked { _profit = assets - debt; } _debtPayment = _debtOutstanding; uint256 toFree = _profit + _debtPayment; // freed is math.min(wantBalance, toFree) (uint256 freed, ) = liquidatePosition(toFree); if (toFree > freed) { if (_debtPayment > freed) { _debtPayment = freed; _profit = 0; } else { unchecked { _profit = freed - _debtPayment; } } } } // if assets are less than debt, we are in trouble. don't worry about withdrawing here, just report losses else { unchecked { _loss = debt - assets; } } } function adjustPosition(uint256 _debtOutstanding) internal override { // if in emergency exit, we don't want to deploy any more funds if (emergencyExit) { return; } // Deposit all of our LP tokens in the gauge uint256 toInvest = balanceOfWant(); if (toInvest > 0) { gauge.deposit(toInvest); } } function liquidatePosition( uint256 _amountNeeded ) internal override returns (uint256 _liquidatedAmount, uint256 _loss) { // check our loose want uint256 wantBal = balanceOfWant(); if (_amountNeeded > wantBal) { uint256 stakedBal = stakedBalance(); if (stakedBal > 0) { uint256 neededFromStaked; unchecked { neededFromStaked = _amountNeeded - wantBal; } // withdraw whatever extra funds we need gauge.withdraw(Math.min(stakedBal, neededFromStaked)); } uint256 withdrawnBal = balanceOfWant(); _liquidatedAmount = Math.min(_amountNeeded, withdrawnBal); unchecked { _loss = _amountNeeded - _liquidatedAmount; } } else { // we have enough balance to cover the liquidation available return (_amountNeeded, 0); } } // fire sale, get rid of it all! function liquidateAllPositions() internal override returns (uint256) { uint256 stakedBal = stakedBalance(); if (stakedBal > 0) { // don't bother withdrawing zero, save gas where we can gauge.withdraw(stakedBal); } return balanceOfWant(); } // migrate our want token to a new strategy if needed, as well as our VELO function prepareMigration(address _newStrategy) internal override { uint256 stakedBal = stakedBalance(); if (stakedBal > 0) { gauge.withdraw(stakedBal); } uint256 veloBal = velo.balanceOf(address(this)); if (veloBal > 0) { velo.safeTransfer(_newStrategy, veloBal); } } // want is blocked by default, add any other tokens to protect from gov here. function protectedTokens() internal view override returns (address[] memory) {} /// @notice In case we enter emergencyExit before harvesting, vault managers can use this function to claim our last rewards. function manualRewardClaim() external onlyVaultManagers { gauge.getReward(address(this)); } /* ========== KEEP3RS ========== */ /** * @notice * Provide a signal to the keeper that harvest() should be called. * * Don't harvest if a strategy is inactive. * If we exceed our max delay, then harvest no matter what. For * our min delay, credit threshold, and manual force trigger, * only harvest if our gas price is acceptable. * * @param callCostinEth The keeper's estimated gas cost to call harvest() (in wei). * @return True if harvest() should be called, false otherwise. */ function harvestTrigger( uint256 callCostinEth ) public view override returns (bool) { // Should not trigger if strategy is not active (no assets and no debtRatio). This means we don't need to adjust keeper job. if (!isActive()) { return false; } // harvest if we have a profit to claim at our upper limit without considering gas price uint256 claimableProfit = claimableProfitInUsdc(); if (claimableProfit > harvestProfitMaxInUsdc) { return true; } // check if the base fee gas price is higher than we allow. if it is, block harvests. if (!isBaseFeeAcceptable()) { return false; } // trigger if we want to manually harvest, but only if our gas price is acceptable if (forceHarvestTriggerOnce) { return true; } // harvest if we have a sufficient profit to claim, but only if our gas price is acceptable if (claimableProfit > harvestProfitMinInUsdc) { return true; } StrategyParams memory params = vault.strategies(address(this)); // harvest regardless of profit once we reach our maxDelay if (block.timestamp - params.lastReport > maxReportDelay) { return true; } // harvest our credit if it's above our threshold if (vault.creditAvailable() > creditThreshold) { return true; } // otherwise, we don't harvest return false; } /// @notice Calculates the profit if all claimable VELO were sold for USDC (6 decimals). /// @dev Calls Velodrome's VELO-USDC pool directly. /// @return Total return in USDC from selling claimable VELO. function claimableProfitInUsdc() public view returns (uint256) { // check price on our VELOv2/USDC pool uint256 veloPrice = IVelodromePool( 0x8134A2fDC127549480865fB8E5A9E8A8a95a54c5 ).getAmountOut(1e18, address(velo)); // Pool returns amount as 6 decimals, so multiply by claimable VELO and divide by VELO decimals (1e18) return (veloPrice * claimableRewards()) / 1e18; } /// @notice Convert our keeper's eth cost into want /// @dev We don't use this since we don't factor call cost into our harvestTrigger. /// @param _ethAmount Amount of ether spent. /// @return Value of ether in want. function ethToWant( uint256 _ethAmount ) public view override returns (uint256) {} /* ========== SETTERS ========== */ // These functions are useful for setting parameters of the strategy that may need to be adjusted. /** * @notice * Here we set various parameters to optimize our harvestTrigger. * @param _harvestProfitMinInUsdc The amount of profit (in USDC, 6 decimals) * that will trigger a harvest if gas price is acceptable. * @param _harvestProfitMaxInUsdc The amount of profit in USDC that * will trigger a harvest regardless of gas price. */ function setHarvestTriggerParams( uint256 _harvestProfitMinInUsdc, uint256 _harvestProfitMaxInUsdc ) external onlyVaultManagers { harvestProfitMinInUsdc = _harvestProfitMinInUsdc; harvestProfitMaxInUsdc = _harvestProfitMaxInUsdc; } /// @notice Here we can override the swap routes set on deployment. /// @dev Must be called by gov or management. /// @param _newSwapRouteForToken0 Swap route for VELO -> token0, using Routes structs. /// @param _newSwapRouteForToken1 Swap route for VELO -> token1, using Routes structs. function setSwapRoutes( IVelodromeRouter.Routes[] memory _newSwapRouteForToken0, IVelodromeRouter.Routes[] memory _newSwapRouteForToken1 ) external onlyVaultManagers { delete swapRouteForToken0; delete swapRouteForToken1; for (uint i; i < _newSwapRouteForToken0.length; ++i) { swapRouteForToken0.push(_newSwapRouteForToken0[i]); } for (uint i; i < _newSwapRouteForToken1.length; ++i) { swapRouteForToken1.push(_newSwapRouteForToken1[i]); } // check our swap paths end with our correct token, but only if it's not VELO if ( address(poolToken0) != address(velo) && address(poolToken0) != swapRouteForToken0[_newSwapRouteForToken0.length - 1].to ) { revert("token0 route error"); } if ( address(poolToken1) != address(velo) && address(poolToken1) != swapRouteForToken1[_newSwapRouteForToken1.length - 1].to ) { revert("token1 route error"); } } /// @notice Use this to set or update our keep amounts for this strategy. /// @dev Must be less than 10,000. Set in basis points. Only governance can set this. /// @param _keepVelo Percent of each VELO harvest to send to our voter. function setLocalKeepVelo(uint256 _keepVelo) external onlyGovernance { if (_keepVelo > 10_000) { revert(); } if (_keepVelo > 0 && veloVoter == address(0)) { revert(); } localKeepVELO = _keepVelo; } /// @notice Use this to set or update our voter contracts. /// @dev For Velo strategies, this is where we send our keepVELO. /// Only governance can set this. /// @param _veloVoter Address of our velodrome voter. function setVoter(address _veloVoter) external onlyGovernance { veloVoter = _veloVoter; } }
// SPDX-License-Identifier: GPL-3.0 pragma solidity >=0.8.15; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; struct StrategyParams { uint256 performanceFee; uint256 activation; uint256 debtRatio; uint256 minDebtPerHarvest; uint256 maxDebtPerHarvest; uint256 lastReport; uint256 totalDebt; uint256 totalGain; uint256 totalLoss; } interface VaultAPI is IERC20 { function name() external view returns (string calldata); function symbol() external view returns (string calldata); function decimals() external view returns (uint256); function apiVersion() external pure returns (string memory); function permit( address owner, address spender, uint256 amount, uint256 expiry, bytes calldata signature ) external returns (bool); // NOTE: Vyper produces multiple signatures for a given function with "default" args function deposit() external returns (uint256); function deposit(uint256 amount) external returns (uint256); function deposit(uint256 amount, address recipient) external returns (uint256); // NOTE: Vyper produces multiple signatures for a given function with "default" args function withdraw() external returns (uint256); function withdraw(uint256 maxShares) external returns (uint256); function withdraw(uint256 maxShares, address recipient) external returns (uint256); function token() external view returns (address); function strategies(address _strategy) external view returns (StrategyParams memory); function pricePerShare() external view returns (uint256); function totalAssets() external view returns (uint256); function depositLimit() external view returns (uint256); function maxAvailableShares() external view returns (uint256); /** * View how much the Vault would increase this Strategy's borrow limit, * based on its present performance (since its last report). Can be used to * determine expectedReturn in your Strategy. */ function creditAvailable() external view returns (uint256); /** * View how much the Vault would like to pull back from the Strategy, * based on its present performance (since its last report). Can be used to * determine expectedReturn in your Strategy. */ function debtOutstanding() external view returns (uint256); /** * View how much the Vault expect this Strategy to return at the current * block, based on its present performance (since its last report). Can be * used to determine expectedReturn in your Strategy. */ function expectedReturn() external view returns (uint256); /** * This is the main contact point where the Strategy interacts with the * Vault. It is critical that this call is handled as intended by the * Strategy. Therefore, this function will be called by BaseStrategy to * make sure the integration is correct. */ function report( uint256 _gain, uint256 _loss, uint256 _debtPayment ) external returns (uint256); /** * This function should only be used in the scenario where the Strategy is * being retired but no migration of the positions are possible, or in the * extreme scenario that the Strategy needs to be put into "Emergency Exit" * mode in order for it to exit as quickly as possible. The latter scenario * could be for any reason that is considered "critical" that the Strategy * exits its position as fast as possible, such as a sudden change in * market conditions leading to losses, or an imminent failure in an * external dependency. */ function revokeStrategy() external; /** * View the governance address of the Vault to assert privileged functions * can only be called by governance. The Strategy serves the Vault, so it * is subject to governance defined by the Vault. */ function governance() external view returns (address); /** * View the management address of the Vault to assert privileged functions * can only be called by management. The Strategy serves the Vault, so it * is subject to management defined by the Vault. */ function management() external view returns (address); /** * View the guardian address of the Vault to assert privileged functions * can only be called by guardian. The Strategy serves the Vault, so it * is subject to guardian defined by the Vault. */ function guardian() external view returns (address); } /** * This interface is here for the keeper bot to use. */ interface StrategyAPI { function name() external view returns (string memory); function vault() external view returns (address); function want() external view returns (address); function apiVersion() external pure returns (string memory); function keeper() external view returns (address); function isActive() external view returns (bool); function delegatedAssets() external view returns (uint256); function estimatedTotalAssets() external view returns (uint256); function tendTrigger(uint256 callCost) external view returns (bool); function tend() external; function harvestTrigger(uint256 callCost) external view returns (bool); function harvest() external; event Harvested(uint256 profit, uint256 loss, uint256 debtPayment, uint256 debtOutstanding); } interface HealthCheck { function check( uint256 profit, uint256 loss, uint256 debtPayment, uint256 debtOutstanding, uint256 totalDebt ) external view returns (bool); } interface IBaseFee { function isCurrentBaseFeeAcceptable() external view returns (bool); } /** * @title Yearn Base Strategy * @author yearn.finance * @notice * BaseStrategy implements all of the required functionality to interoperate * closely with the Vault contract. This contract should be inherited and the * abstract methods implemented to adapt the Strategy to the particular needs * it has to create a return. * * Of special interest is the relationship between `harvest()` and * `vault.report()'. `harvest()` may be called simply because enough time has * elapsed since the last report, and not because any funds need to be moved * or positions adjusted. This is critical so that the Vault may maintain an * accurate picture of the Strategy's performance. See `vault.report()`, * `harvest()`, and `harvestTrigger()` for further details. */ abstract contract BaseStrategy { using SafeERC20 for IERC20; string public metadataURI; // health checks bool public doHealthCheck; address public healthCheck; /** * @notice * Used to track which version of `StrategyAPI` this Strategy * implements. * @dev The Strategy's version must match the Vault's `API_VERSION`. * @return A string which holds the current API version of this contract. */ function apiVersion() public pure returns (string memory) { return "0.4.6"; } /** * @notice This Strategy's name. * @dev * You can use this field to manage the "version" of this Strategy, e.g. * `StrategySomethingOrOtherV1`. However, "API Version" is managed by * `apiVersion()` function above. * @return This Strategy's name. */ function name() external view virtual returns (string memory); /** * @notice * The amount (priced in want) of the total assets managed by this strategy should not count * towards Yearn's TVL calculations. * @dev * You can override this field to set it to a non-zero value if some of the assets of this * Strategy is somehow delegated inside another part of of Yearn's ecosystem e.g. another Vault. * Note that this value must be strictly less than or equal to the amount provided by * `estimatedTotalAssets()` below, as the TVL calc will be total assets minus delegated assets. * Also note that this value is used to determine the total assets under management by this * strategy, for the purposes of computing the management fee in `Vault` * @return * The amount of assets this strategy manages that should not be included in Yearn's Total Value * Locked (TVL) calculation across it's ecosystem. */ function delegatedAssets() external view virtual returns (uint256) { return 0; } VaultAPI public vault; address public strategist; address public rewards; address public keeper; IERC20 public want; // So indexers can keep track of this event Harvested(uint256 profit, uint256 loss, uint256 debtPayment, uint256 debtOutstanding); event UpdatedStrategist(address newStrategist); event UpdatedKeeper(address newKeeper); event UpdatedRewards(address rewards); event UpdatedMinReportDelay(uint256 delay); event UpdatedMaxReportDelay(uint256 delay); event UpdatedBaseFeeOracle(address baseFeeOracle); event UpdatedCreditThreshold(uint256 creditThreshold); event ForcedHarvestTrigger(bool triggerState); event EmergencyExitEnabled(); event UpdatedMetadataURI(string metadataURI); event SetHealthCheck(address); event SetDoHealthCheck(bool); // The minimum number of seconds between harvest calls. See // `setMinReportDelay()` for more details. uint256 public minReportDelay; // The maximum number of seconds between harvest calls. See // `setMaxReportDelay()` for more details. uint256 public maxReportDelay; // See note on `setEmergencyExit()`. bool public emergencyExit; // See note on `isBaseFeeOracleAcceptable()`. address public baseFeeOracle; // See note on `setCreditThreshold()` uint256 public creditThreshold; // See note on `setForceHarvestTriggerOnce` bool public forceHarvestTriggerOnce; // modifiers modifier onlyAuthorized() { _onlyAuthorized(); _; } modifier onlyEmergencyAuthorized() { _onlyEmergencyAuthorized(); _; } modifier onlyStrategist() { _onlyStrategist(); _; } modifier onlyGovernance() { _onlyGovernance(); _; } modifier onlyRewarder() { _onlyRewarder(); _; } modifier onlyKeepers() { _onlyKeepers(); _; } modifier onlyVaultManagers() { _onlyVaultManagers(); _; } function _onlyAuthorized() internal { require(msg.sender == strategist || msg.sender == governance()); } function _onlyEmergencyAuthorized() internal { require(msg.sender == strategist || msg.sender == governance() || msg.sender == vault.guardian() || msg.sender == vault.management()); } function _onlyStrategist() internal { require(msg.sender == strategist); } function _onlyGovernance() internal { require(msg.sender == governance()); } function _onlyRewarder() internal { require(msg.sender == governance() || msg.sender == strategist); } function _onlyKeepers() internal { require( msg.sender == keeper || msg.sender == strategist || msg.sender == governance() || msg.sender == vault.guardian() || msg.sender == vault.management() ); } function _onlyVaultManagers() internal { require(msg.sender == vault.management() || msg.sender == governance()); } constructor(address _vault) { _initialize(_vault, msg.sender, msg.sender, msg.sender); } /** * @notice * Initializes the Strategy, this is called only once, when the * contract is deployed. * @dev `_vault` should implement `VaultAPI`. * @param _vault The address of the Vault responsible for this Strategy. * @param _strategist The address to assign as `strategist`. * The strategist is able to change the reward address * @param _rewards The address to use for pulling rewards. * @param _keeper The adddress of the _keeper. _keeper * can harvest and tend a strategy. */ function _initialize( address _vault, address _strategist, address _rewards, address _keeper ) internal { require(address(want) == address(0), "Strategy already initialized"); vault = VaultAPI(_vault); want = IERC20(vault.token()); want.safeApprove(_vault, type(uint256).max); // Give Vault unlimited access (might save gas) strategist = _strategist; rewards = _rewards; keeper = _keeper; // initialize variables maxReportDelay = 30 days; creditThreshold = 1_000_000 * 10**vault.decimals(); // set this high by default so we don't get tons of false triggers if not changed vault.approve(rewards, type(uint256).max); // Allow rewards to be pulled } function setHealthCheck(address _healthCheck) external onlyVaultManagers { emit SetHealthCheck(_healthCheck); healthCheck = _healthCheck; } function setDoHealthCheck(bool _doHealthCheck) external onlyVaultManagers { emit SetDoHealthCheck(_doHealthCheck); doHealthCheck = _doHealthCheck; } /** * @notice * Used to change `strategist`. * * This may only be called by governance or the existing strategist. * @param _strategist The new address to assign as `strategist`. */ function setStrategist(address _strategist) external onlyAuthorized { require(_strategist != address(0)); strategist = _strategist; emit UpdatedStrategist(_strategist); } /** * @notice * Used to change `keeper`. * * `keeper` is the only address that may call `tend()` or `harvest()`, * other than `governance()` or `strategist`. However, unlike * `governance()` or `strategist`, `keeper` may *only* call `tend()` * and `harvest()`, and no other authorized functions, following the * principle of least privilege. * * This may only be called by governance or the strategist. * @param _keeper The new address to assign as `keeper`. */ function setKeeper(address _keeper) external onlyAuthorized { require(_keeper != address(0)); keeper = _keeper; emit UpdatedKeeper(_keeper); } /** * @notice * Used to change `rewards`. EOA or smart contract which has the permission * to pull rewards from the vault. * * This may only be called by the strategist. * @param _rewards The address to use for pulling rewards. */ function setRewards(address _rewards) external onlyRewarder { require(_rewards != address(0)); vault.approve(rewards, 0); rewards = _rewards; vault.approve(rewards, type(uint256).max); emit UpdatedRewards(_rewards); } /** * @notice * Used to change `minReportDelay`. `minReportDelay` is the minimum number * of blocks that should pass for `harvest()` to be called. * * For external keepers (such as the Keep3r network), this is the minimum * time between jobs to wait. (see `harvestTrigger()` * for more details.) * * This may only be called by governance or the strategist. * @param _delay The minimum number of seconds to wait between harvests. */ function setMinReportDelay(uint256 _delay) external onlyAuthorized { minReportDelay = _delay; emit UpdatedMinReportDelay(_delay); } /** * @notice * Used to change `maxReportDelay`. `maxReportDelay` is the maximum number * of blocks that should pass for `harvest()` to be called. * * For external keepers (such as the Keep3r network), this is the maximum * time between jobs to wait. (see `harvestTrigger()` * for more details.) * * This may only be called by governance or the strategist. * @param _delay The maximum number of seconds to wait between harvests. */ function setMaxReportDelay(uint256 _delay) external onlyAuthorized { maxReportDelay = _delay; emit UpdatedMaxReportDelay(_delay); } /** * @notice * Used to ensure that any significant credit a strategy has from the * vault will be automatically harvested. * * This may only be called by governance or management. * @param _creditThreshold The number of want tokens that will * automatically trigger a harvest. */ function setCreditThreshold(uint256 _creditThreshold) external onlyVaultManagers { creditThreshold = _creditThreshold; emit UpdatedCreditThreshold(_creditThreshold); } /** * @notice * Used to automatically trigger a harvest by our keepers. Can be * useful if gas prices are too high now, and we want to harvest * later once prices have lowered. * * This may only be called by governance or management. * @param _forceHarvestTriggerOnce Value of true tells keepers to harvest * our strategy */ function setForceHarvestTriggerOnce(bool _forceHarvestTriggerOnce) external onlyVaultManagers { forceHarvestTriggerOnce = _forceHarvestTriggerOnce; emit ForcedHarvestTrigger(_forceHarvestTriggerOnce); } /** * @notice * Used to set our baseFeeOracle, which checks the network's current base * fee price to determine whether it is an optimal time to harvest or tend. * * This may only be called by governance or management. * @param _baseFeeOracle Address of our baseFeeOracle */ function setBaseFeeOracle(address _baseFeeOracle) external onlyVaultManagers { baseFeeOracle = _baseFeeOracle; emit UpdatedBaseFeeOracle(_baseFeeOracle); } /** * @notice * Used to change `metadataURI`. `metadataURI` is used to store the URI * of the file describing the strategy. * * This may only be called by governance or the strategist. * @param _metadataURI The URI that describe the strategy. */ function setMetadataURI(string calldata _metadataURI) external onlyAuthorized { metadataURI = _metadataURI; emit UpdatedMetadataURI(_metadataURI); } /** * Resolve governance address from Vault contract, used to make assertions * on protected functions in the Strategy. */ function governance() internal view returns (address) { return vault.governance(); } /** * @notice * Provide an accurate conversion from `_amtInWei` (denominated in wei) * to `want` (using the native decimal characteristics of `want`). * @dev * Care must be taken when working with decimals to assure that the conversion * is compatible. As an example: * * given 1e17 wei (0.1 ETH) as input, and want is USDC (6 decimals), * with USDC/ETH = 1800, this should give back 1800000000 (180 USDC) * * @param _amtInWei The amount (in wei/1e-18 ETH) to convert to `want` * @return The amount in `want` of `_amtInEth` converted to `want` **/ function ethToWant(uint256 _amtInWei) public view virtual returns (uint256); /** * @notice * Provide an accurate estimate for the total amount of assets * (principle + return) that this Strategy is currently managing, * denominated in terms of `want` tokens. * * This total should be "realizable" e.g. the total value that could * *actually* be obtained from this Strategy if it were to divest its * entire position based on current on-chain conditions. * @dev * Care must be taken in using this function, since it relies on external * systems, which could be manipulated by the attacker to give an inflated * (or reduced) value produced by this function, based on current on-chain * conditions (e.g. this function is possible to influence through * flashloan attacks, oracle manipulations, or other DeFi attack * mechanisms). * * It is up to governance to use this function to correctly order this * Strategy relative to its peers in the withdrawal queue to minimize * losses for the Vault based on sudden withdrawals. This value should be * higher than the total debt of the Strategy and higher than its expected * value to be "safe". * @return The estimated total assets in this Strategy. */ function estimatedTotalAssets() public view virtual returns (uint256); /* * @notice * Provide an indication of whether this strategy is currently "active" * in that it is managing an active position, or will manage a position in * the future. This should correlate to `harvest()` activity, so that Harvest * events can be tracked externally by indexing agents. * @return True if the strategy is actively managing a position. */ function isActive() public view returns (bool) { return vault.strategies(address(this)).debtRatio > 0 || estimatedTotalAssets() > 0; } /** * Perform any Strategy unwinding or other calls necessary to capture the * "free return" this Strategy has generated since the last time its core * position(s) were adjusted. Examples include unwrapping extra rewards. * This call is only used during "normal operation" of a Strategy, and * should be optimized to minimize losses as much as possible. * * This method returns any realized profits and/or realized losses * incurred, and should return the total amounts of profits/losses/debt * payments (in `want` tokens) for the Vault's accounting (e.g. * `want.balanceOf(this) >= _debtPayment + _profit`). * * `_debtOutstanding` will be 0 if the Strategy is not past the configured * debt limit, otherwise its value will be how far past the debt limit * the Strategy is. The Strategy's debt limit is configured in the Vault. * * NOTE: `_debtPayment` should be less than or equal to `_debtOutstanding`. * It is okay for it to be less than `_debtOutstanding`, as that * should only used as a guide for how much is left to pay back. * Payments should be made to minimize loss from slippage, debt, * withdrawal fees, etc. * * See `vault.debtOutstanding()`. */ function prepareReturn(uint256 _debtOutstanding) internal virtual returns ( uint256 _profit, uint256 _loss, uint256 _debtPayment ); /** * Perform any adjustments to the core position(s) of this Strategy given * what change the Vault made in the "investable capital" available to the * Strategy. Note that all "free capital" in the Strategy after the report * was made is available for reinvestment. Also note that this number * could be 0, and you should handle that scenario accordingly. * * See comments regarding `_debtOutstanding` on `prepareReturn()`. */ function adjustPosition(uint256 _debtOutstanding) internal virtual; /** * Liquidate up to `_amountNeeded` of `want` of this strategy's positions, * irregardless of slippage. Any excess will be re-invested with `adjustPosition()`. * This function should return the amount of `want` tokens made available by the * liquidation. If there is a difference between them, `_loss` indicates whether the * difference is due to a realized loss, or if there is some other sitution at play * (e.g. locked funds) where the amount made available is less than what is needed. * * NOTE: The invariant `_liquidatedAmount + _loss <= _amountNeeded` should always be maintained */ function liquidatePosition(uint256 _amountNeeded) internal virtual returns (uint256 _liquidatedAmount, uint256 _loss); /** * Liquidate everything and returns the amount that got freed. * This function is used during emergency exit instead of `prepareReturn()` to * liquidate all of the Strategy's positions back to the Vault. */ function liquidateAllPositions() internal virtual returns (uint256 _amountFreed); /** * @notice * Provide a signal to the keeper that `tend()` should be called. The * keeper will provide the estimated gas cost that they would pay to call * `tend()`, and this function should use that estimate to make a * determination if calling it is "worth it" for the keeper. This is not * the only consideration into issuing this trigger, for example if the * position would be negatively affected if `tend()` is not called * shortly, then this can return `true` even if the keeper might be * "at a loss" (keepers are always reimbursed by Yearn). * @dev * `callCostInWei` must be priced in terms of `wei` (1e-18 ETH). * * This call and `harvestTrigger()` should never return `true` at the same * time. * @param callCostInWei The keeper's estimated gas cost to call `tend()` (in wei). * @return `true` if `tend()` should be called, `false` otherwise. */ function tendTrigger(uint256 callCostInWei) public view virtual returns (bool) { // We usually don't need tend, but if there are positions that need // active maintainence, overriding this function is how you would // signal for that. // If your implementation uses the cost of the call in want, you can // use uint256 callCost = ethToWant(callCostInWei); // It is highly suggested to use the baseFeeOracle here as well. return false; } /** * @notice * Adjust the Strategy's position. The purpose of tending isn't to * realize gains, but to maximize yield by reinvesting any returns. * * See comments on `adjustPosition()`. * * This may only be called by governance, the strategist, or the keeper. */ function tend() external onlyKeepers { // Don't take profits with this call, but adjust for better gains adjustPosition(vault.debtOutstanding()); } /** * @notice * Provide a signal to the keeper that `harvest()` should be called. The * keeper will provide the estimated gas cost that they would pay to call * `harvest()`, and this function should use that estimate to make a * determination if calling it is "worth it" for the keeper. This is not * the only consideration into issuing this trigger, for example if the * position would be negatively affected if `harvest()` is not called * shortly, then this can return `true` even if the keeper might be "at a * loss" (keepers are always reimbursed by Yearn). * @dev * `callCostInWei` must be priced in terms of `wei` (1e-18 ETH). * * This call and `tendTrigger` should never return `true` at the * same time. * * See `maxReportDelay`, `creditThreshold` to adjust the * strategist-controlled parameters that will influence whether this call * returns `true` or not. These parameters will be used in conjunction * with the parameters reported to the Vault (see `params`) to determine * if calling `harvest()` is merited. * * This trigger also checks the network's base fee to avoid harvesting during * times of high network congestion. * * Consider use of super.harvestTrigger() in any override to build on top * of this logic instead of replacing it. For example, if using `minReportDelay`. * * It is expected that an external system will check `harvestTrigger()`. * This could be a script run off a desktop or cloud bot (e.g. * https://github.com/iearn-finance/yearn-vaults/blob/main/scripts/keep.py), * or via an integration with the Keep3r network (e.g. * https://github.com/Macarse/GenericKeep3rV2/blob/master/contracts/keep3r/GenericKeep3rV2.sol). * @param callCostInWei The keeper's estimated gas cost to call `harvest()` (in wei). * @return `true` if `harvest()` should be called, `false` otherwise. */ function harvestTrigger(uint256 callCostInWei) public view virtual returns (bool) { // Should not trigger if strategy is not active (no assets or no debtRatio) if (!isActive()) return false; // check if the base fee gas price is higher than we allow. if it is, block harvests. if (!isBaseFeeAcceptable()) return false; // trigger if we want to manually harvest, but only if our gas price is acceptable if (forceHarvestTriggerOnce) return true; // Should trigger if hasn't been called in a while StrategyParams memory params = vault.strategies(address(this)); if ((block.timestamp - params.lastReport) >= maxReportDelay) return true; // harvest our credit if it's above our threshold or return false return (vault.creditAvailable() > creditThreshold); } /** * @notice * Check if the current network base fee is below our external target. If * not, then harvestTrigger will return false. * @return `true` if `harvest()` should be allowed, `false` otherwise. */ function isBaseFeeAcceptable() public view returns (bool) { if (baseFeeOracle == address(0)) return true; else return IBaseFee(baseFeeOracle).isCurrentBaseFeeAcceptable(); } /** * @notice * Harvests the Strategy, recognizing any profits or losses and adjusting * the Strategy's position. * * In the rare case the Strategy is in emergency shutdown, this will exit * the Strategy's position. * * This may only be called by governance, the strategist, or the keeper. * @dev * When `harvest()` is called, the Strategy reports to the Vault (via * `vault.report()`), so in some cases `harvest()` must be called in order * to take in profits, to borrow newly available funds from the Vault, or * otherwise adjust its position. In other cases `harvest()` must be * called to report to the Vault on the Strategy's position, especially if * any losses have occurred. */ function harvest() external onlyKeepers { uint256 profit = 0; uint256 loss = 0; uint256 debtOutstanding = vault.debtOutstanding(); uint256 debtPayment = 0; if (emergencyExit) { // Free up as much capital as possible uint256 amountFreed = liquidateAllPositions(); if (amountFreed < debtOutstanding) { loss = debtOutstanding - amountFreed; } else if (amountFreed > debtOutstanding) { profit = amountFreed - debtOutstanding; } debtPayment = debtOutstanding - loss; } else { // Free up returns for Vault to pull (profit, loss, debtPayment) = prepareReturn(debtOutstanding); } // we're done harvesting, so reset our trigger if we used it forceHarvestTriggerOnce = false; emit ForcedHarvestTrigger(false); // Allow Vault to take up to the "harvested" balance of this contract, // which is the amount it has earned since the last time it reported to // the Vault. uint256 totalDebt = vault.strategies(address(this)).totalDebt; debtOutstanding = vault.report(profit, loss, debtPayment); // Check if free returns are left, and re-invest them adjustPosition(debtOutstanding); // call healthCheck contract if (doHealthCheck && healthCheck != address(0)) { require(HealthCheck(healthCheck).check(profit, loss, debtPayment, debtOutstanding, totalDebt), "!healthcheck"); } else { emit SetDoHealthCheck(true); doHealthCheck = true; } emit Harvested(profit, loss, debtPayment, debtOutstanding); } /** * @notice * Withdraws `_amountNeeded` to `vault`. * * This may only be called by the Vault. * @param _amountNeeded How much `want` to withdraw. * @return _loss Any realized losses */ function withdraw(uint256 _amountNeeded) external returns (uint256 _loss) { require(msg.sender == address(vault), "!vault"); // Liquidate as much as possible to `want`, up to `_amountNeeded` uint256 amountFreed; (amountFreed, _loss) = liquidatePosition(_amountNeeded); // Send it directly back (NOTE: Using `msg.sender` saves some gas here) want.safeTransfer(msg.sender, amountFreed); // NOTE: Reinvest anything leftover on next `tend`/`harvest` } /** * Do anything necessary to prepare this Strategy for migration, such as * transferring any reserve or LP tokens, CDPs, or other tokens or stores of * value. */ function prepareMigration(address _newStrategy) internal virtual; /** * @notice * Transfers all `want` from this Strategy to `_newStrategy`. * * This may only be called by the Vault. * @dev * The new Strategy's Vault must be the same as this Strategy's Vault. * The migration process should be carefully performed to make sure all * the assets are migrated to the new address, which should have never * interacted with the vault before. * @param _newStrategy The Strategy to migrate to. */ function migrate(address _newStrategy) external { require(msg.sender == address(vault)); require(BaseStrategy(_newStrategy).vault() == vault); prepareMigration(_newStrategy); want.safeTransfer(_newStrategy, want.balanceOf(address(this))); } /** * @notice * Activates emergency exit. Once activated, the Strategy will exit its * position upon the next harvest, depositing all funds into the Vault as * quickly as is reasonable given on-chain conditions. * * This may only be called by governance or the strategist. * @dev * See `vault.setEmergencyShutdown()` and `harvest()` for further details. */ function setEmergencyExit() external onlyEmergencyAuthorized { emergencyExit = true; if (vault.strategies(address(this)).debtRatio != 0) { vault.revokeStrategy(); } emit EmergencyExitEnabled(); } /** * Override this to add all tokens/tokenized positions this contract * manages on a *persistent* basis (e.g. not just for swapping back to * want ephemerally). * * NOTE: Do *not* include `want`, already included in `sweep` below. * * Example: * ``` * function protectedTokens() internal override view returns (address[] memory) { * address[] memory protected = new address[](3); * protected[0] = tokenA; * protected[1] = tokenB; * protected[2] = tokenC; * return protected; * } * ``` */ function protectedTokens() internal view virtual returns (address[] memory); /** * @notice * Removes tokens from this Strategy that are not the type of tokens * managed by this Strategy. This may be used in case of accidentally * sending the wrong kind of token to this Strategy. * * Tokens will be sent to `governance()`. * * This will fail if an attempt is made to sweep `want`, or any tokens * that are protected by this Strategy. * * This may only be called by governance. * @dev * Implement `protectedTokens()` to specify any additional tokens that * should be protected from sweeping in addition to `want`. * @param _token The token to transfer out of this vault. */ function sweep(address _token) external onlyGovernance { require(_token != address(want), "!want"); require(_token != address(vault), "!shares"); address[] memory _protectedTokens = protectedTokens(); for (uint256 i; i < _protectedTokens.length; i++) require(_token != _protectedTokens[i], "!protected"); IERC20(_token).safeTransfer(governance(), IERC20(_token).balanceOf(address(this))); } } abstract contract BaseStrategyInitializable is BaseStrategy { bool public isOriginal = true; event Cloned(address indexed clone); constructor(address _vault) BaseStrategy(_vault) {} function initialize( address _vault, address _strategist, address _rewards, address _keeper ) external virtual { _initialize(_vault, _strategist, _rewards, _keeper); } function clone(address _vault) external returns (address) { return clone(_vault, msg.sender, msg.sender, msg.sender); } function clone( address _vault, address _strategist, address _rewards, address _keeper ) public returns (address newStrategy) { require(isOriginal, "!clone"); // Copied from https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol bytes20 addressBytes = bytes20(address(this)); assembly { // EIP-1167 bytecode let clone_code := mload(0x40) mstore(clone_code, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000) mstore(add(clone_code, 0x14), addressBytes) mstore(add(clone_code, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000) newStrategy := create(0, clone_code, 0x37) } BaseStrategyInitializable(newStrategy).initialize(_vault, _strategist, _rewards, _keeper); emit Cloned(newStrategy); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { // Solidity will revert if denominator == 0, unlike the div opcode on its own. // The surrounding unchecked block does not change this fact. // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic. return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1, "Math: mulDiv overflow"); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10 ** 64) { value /= 10 ** 64; result += 64; } if (value >= 10 ** 32) { value /= 10 ** 32; result += 32; } if (value >= 10 ** 16) { value /= 10 ** 16; result += 16; } if (value >= 10 ** 8) { value /= 10 ** 8; result += 8; } if (value >= 10 ** 4) { value /= 10 ** 4; result += 4; } if (value >= 10 ** 2) { value /= 10 ** 2; result += 2; } if (value >= 10 ** 1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 256, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * The default value of {decimals} is 18. To change this, you should override * this function so it returns a different value. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the default value returned by this function, unless * it's overridden. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer(address from, address to, uint256 amount) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _balances[account] += amount; } emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; // Overflow not possible: amount <= accountBalance <= totalSupply. _totalSupply -= amount; } emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.