ERC-20
Overview
Max Total Supply
1,040,211.832735890196334632 sOM
Holders
384
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0 sOMValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
StakingPool
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
No with 200 runs
Other Settings:
constantinople EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; pragma experimental ABIEncoderV2; import "openzeppelin-solidity/contracts/math/Math.sol"; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol"; import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol"; import "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol"; import "openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol"; import "solowei/contracts/AttoDecimal.sol"; import "solowei/contracts/TwoStageOwnable.sol"; contract StakingPool is ERC20, ReentrancyGuard, TwoStageOwnable { using SafeMath for uint256; using SafeERC20 for IERC20; using AttoDecimal for AttoDecimal.Instance; struct Strategy { uint256 endBlockNumber; uint256 perBlockReward; uint256 startBlockNumber; } struct Unstake { uint256 amount; uint256 applicableAt; } uint256 public constant MIN_STAKE_BALANCE = 10**18; uint256 public claimingFeePercent; uint256 public lastUpdateBlockNumber; uint256 private _feePool; uint256 private _lockedRewards; uint256 private _totalStaked; uint256 private _totalUnstaked; uint256 private _unstakingTime; IERC20 private _stakingToken; AttoDecimal.Instance private _defaultPrice; AttoDecimal.Instance private _price; Strategy private _currentStrategy; Strategy private _nextStrategy; mapping(address => Unstake) private _unstakes; function getBlockNumber() internal view virtual returns (uint256) { return block.number; } function getTimestamp() internal view virtual returns (uint256) { return block.timestamp; } function feePool() public view returns (uint256) { return _feePool; } function lockedRewards() public view returns (uint256) { return _lockedRewards; } function totalStaked() public view returns (uint256) { return _totalStaked; } function totalUnstaked() public view returns (uint256) { return _totalUnstaked; } function stakingToken() public view returns (IERC20) { return _stakingToken; } function unstakingTime() public view returns (uint256) { return _unstakingTime; } function currentStrategy() public view returns (Strategy memory) { return _currentStrategy; } function nextStrategy() public view returns (Strategy memory) { return _nextStrategy; } function getUnstake(address account) public view returns (Unstake memory result) { result = _unstakes[account]; } function defaultPrice() external view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return _defaultPrice.toTuple(); } function getCurrentStrategyUnlockedRewards() public view returns (uint256 unlocked) { unlocked = _getStrategyUnlockedRewards(_currentStrategy); } function getUnlockedRewards() public view returns (uint256 unlocked, bool currentStrategyEnded) { unlocked = _getStrategyUnlockedRewards(_currentStrategy); if (getBlockNumber() >= _currentStrategy.endBlockNumber) { currentStrategyEnded = true; if (_nextStrategy.endBlockNumber != 0) unlocked = unlocked.add(_getStrategyUnlockedRewards(_nextStrategy)); } } /// @notice Calculates price of synthetic token for current block function price() public view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { (uint256 unlocked, ) = getUnlockedRewards(); uint256 totalStaked_ = _totalStaked; uint256 totalSupply_ = totalSupply(); AttoDecimal.Instance memory result = _defaultPrice; if (totalSupply_ > 0) result = AttoDecimal.div(totalStaked_.add(unlocked), totalSupply_); return result.toTuple(); } /// @notice Returns last updated price of synthetic token function priceStored() public view returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return _price.toTuple(); } /// @notice Calculates expected result of swapping synthetic tokens for staking tokens /// @param account Account that wants to swap /// @param amount Minimum amount of staking tokens that should be received at swapping process /// @return unstakedAmount Amount of staking tokens that should be received at swapping process /// @return burnedAmount Amount of synthetic tokens that should be burned at swapping process function calculateUnstake(address account, uint256 amount) public view returns (uint256 unstakedAmount, uint256 burnedAmount) { (uint256 mantissa_, , ) = price(); return _calculateUnstake(account, amount, AttoDecimal.Instance(mantissa_)); } event Claimed( address indexed account, uint256 requestedAmount, uint256 claimedAmount, uint256 feeAmount, uint256 burnedAmount ); event ClaimingFeePercentUpdated(uint256 feePercent); event CurrentStrategyUpdated(uint256 perBlockReward, uint256 startBlockNumber, uint256 endBlockNumber); event FeeClaimed(address indexed receiver, uint256 amount); event Migrated( address indexed account, uint256 omTokenV1StakeAmount, uint256 stakingPoolV1Reward, uint256 stakingPoolV2Reward ); event NextStrategyUpdated(uint256 perBlockReward, uint256 startBlockNumber, uint256 endBlockNumber); event UnstakingTimeUpdated(uint256 unstakingTime); event NextStrategyRemoved(); event PoolDecreased(uint256 amount); event PoolIncreased(address indexed payer, uint256 amount); event PriceUpdated(uint256 mantissa, uint256 base, uint256 exponentiation); event RewardsUnlocked(uint256 amount); event Staked(address indexed account, address indexed payer, uint256 stakedAmount, uint256 mintedAmount); event Unstaked(address indexed account, uint256 requestedAmount, uint256 unstakedAmount, uint256 burnedAmount); event UnstakingCanceled(address indexed account, uint256 amount); event Withdrawed(address indexed account, uint256 amount); constructor( string memory syntheticTokenName, string memory syntheticTokenSymbol, IERC20 stakingToken_, address owner_, uint256 claimingFeePercent_, uint256 perBlockReward_, uint256 startBlockNumber_, uint256 duration_, uint256 unstakingTime_, uint256 defaultPriceMantissa ) public TwoStageOwnable(owner_) ERC20(syntheticTokenName, syntheticTokenSymbol) { _defaultPrice = AttoDecimal.Instance(defaultPriceMantissa); _stakingToken = stakingToken_; _setClaimingFeePercent(claimingFeePercent_); _validateStrategyParameters(perBlockReward_, startBlockNumber_, duration_); _setUnstakingTime(unstakingTime_); _setCurrentStrategy(perBlockReward_, startBlockNumber_, startBlockNumber_.add(duration_)); lastUpdateBlockNumber = getBlockNumber(); _price = _defaultPrice; } /// @notice Cancels unstaking by staking locked for withdrawals tokens /// @param amount Amount of locked for withdrawals tokens function cancelUnstaking(uint256 amount) external onlyPositiveAmount(amount) returns (bool success) { _update(); address caller = msg.sender; Unstake storage unstake_ = _unstakes[caller]; uint256 unstakingAmount = unstake_.amount; require(unstakingAmount >= amount, "Not enough unstaked balance"); uint256 stakedAmount = _price.mul(balanceOf(caller)).floor(); require(stakedAmount.add(amount) >= MIN_STAKE_BALANCE, "Stake balance lt min stake"); uint256 synthAmount = AttoDecimal.div(amount, _price).floor(); _mint(caller, synthAmount); _totalStaked = _totalStaked.add(amount); _totalUnstaked = _totalUnstaked.sub(amount); unstake_.amount = unstakingAmount.sub(amount); emit Staked(caller, address(0), amount, synthAmount); emit UnstakingCanceled(caller, amount); return true; } /// @notice Swaps synthetic tokens for staking tokens and immediately sends them to the caller but takes some fee /// @param amount Staking tokens amount to swap for. Fee will be taked from this amount /// @return claimedAmount Amount of staking tokens that was been sended to caller /// @return burnedAmount Amount of synthetic tokens that was burned while swapping function claim(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 claimedAmount, uint256 burnedAmount) { _update(); address caller = msg.sender; (claimedAmount, burnedAmount) = _calculateUnstake(caller, amount, _price); uint256 fee = claimedAmount.mul(claimingFeePercent).div(100); _burn(caller, burnedAmount); _totalStaked = _totalStaked.sub(claimedAmount); claimedAmount = claimedAmount.sub(fee); _feePool = _feePool.add(fee); emit Claimed(caller, amount, claimedAmount, fee, burnedAmount); _stakingToken.safeTransfer(caller, claimedAmount); } /// @notice Withdraws all staking tokens, that have been accumulated in imidiatly claiming process. /// Allowed to be called only by the owner /// @return amount Amount of accumulated and withdrawed tokens function claimFees() external onlyOwner returns (uint256 amount) { require(_feePool > 0, "No fees"); amount = _feePool; _feePool = 0; emit FeeClaimed(owner(), amount); _stakingToken.safeTransfer(owner(), amount); } /// @notice Creates new strategy. Allowed to be called only by the owner /// @param perBlockReward_ Reward that should be added to common staking tokens pool every block /// @param startBlockNumber_ Number of block from which strategy should starts /// @param duration_ Blocks count for which new strategy should be applied function createNewStrategy( uint256 perBlockReward_, uint256 startBlockNumber_, uint256 duration_ ) public onlyOwner returns (bool success) { _update(); _validateStrategyParameters(perBlockReward_, startBlockNumber_, duration_); uint256 endBlockNumber = startBlockNumber_.add(duration_); Strategy memory strategy = Strategy({ perBlockReward: perBlockReward_, startBlockNumber: startBlockNumber_, endBlockNumber: endBlockNumber }); if (_currentStrategy.startBlockNumber > getBlockNumber()) { delete _nextStrategy; emit NextStrategyRemoved(); _currentStrategy = strategy; emit CurrentStrategyUpdated(perBlockReward_, startBlockNumber_, endBlockNumber); } else { emit NextStrategyUpdated(perBlockReward_, startBlockNumber_, endBlockNumber); _nextStrategy = strategy; if (_currentStrategy.endBlockNumber > startBlockNumber_) { _currentStrategy.endBlockNumber = startBlockNumber_; emit CurrentStrategyUpdated( _currentStrategy.perBlockReward, _currentStrategy.startBlockNumber, startBlockNumber_ ); } } return true; } function decreasePool(uint256 amount) external onlyPositiveAmount(amount) onlyOwner returns (bool success) { _update(); _lockedRewards = _lockedRewards.sub(amount, "Not enough locked rewards"); emit PoolDecreased(amount); _stakingToken.safeTransfer(owner(), amount); return true; } /// @notice Increases pool of rewards /// @param amount Amount of staking tokens (in wei) that should be added to rewards pool function increasePool(uint256 amount) external onlyPositiveAmount(amount) returns (bool success) { _update(); address payer = msg.sender; _lockedRewards = _lockedRewards.add(amount); emit PoolIncreased(payer, amount); _stakingToken.safeTransferFrom(payer, address(this), amount); return true; } /// @notice Change claiming fee percent. Can be called only by the owner /// @param feePercent New claiming fee percent function setClaimingFeePercent(uint256 feePercent) external onlyOwner returns (bool success) { _setClaimingFeePercent(feePercent); return true; } /// @notice Converts staking tokens to synthetic tokens /// @param amount Amount of staking tokens to be swapped /// @return mintedAmount Amount of synthetic tokens that was received at swapping process function stake(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 mintedAmount) { address staker = msg.sender; return _stake(staker, staker, amount); } /// @notice Converts staking tokens to synthetic tokens and sends them to specific account /// @param account Receiver of synthetic tokens /// @param amount Amount of staking tokens to be swapped /// @return mintedAmount Amount of synthetic tokens that was received by specified account at swapping process function stakeForUser(address account, uint256 amount) external onlyPositiveAmount(amount) returns (uint256 mintedAmount) { return _stake(account, msg.sender, amount); } /// @notice Swapes synthetic tokens for staking tokens and locks them for some period /// @param amount Minimum amount of staking tokens that should be locked after swapping process /// @return unstakedAmount Amount of staking tokens that was locked /// @return burnedAmount Amount of synthetic tokens that was burned function unstake(uint256 amount) external onlyPositiveAmount(amount) returns (uint256 unstakedAmount, uint256 burnedAmount) { _update(); address caller = msg.sender; (unstakedAmount, burnedAmount) = _calculateUnstake(caller, amount, _price); _burn(caller, burnedAmount); _totalStaked = _totalStaked.sub(unstakedAmount); _totalUnstaked = _totalUnstaked.add(unstakedAmount); Unstake storage unstake_ = _unstakes[caller]; unstake_.amount = unstake_.amount.add(unstakedAmount); unstake_.applicableAt = getTimestamp().add(_unstakingTime); emit Unstaked(caller, amount, unstakedAmount, burnedAmount); } /// @notice Updates price of synthetic token /// @dev Automatically has been called on every contract action, that uses or can affect price function update() external returns (bool success) { _update(); return true; } /// @notice Withdraws unstaked staking tokens function withdraw() external returns (bool success) { address caller = msg.sender; Unstake storage unstake_ = _unstakes[caller]; uint256 amount = unstake_.amount; require(amount > 0, "Not unstaked"); require(unstake_.applicableAt <= getTimestamp(), "Not released at"); delete _unstakes[caller]; _totalUnstaked = _totalUnstaked.sub(amount); emit Withdrawed(caller, amount); _stakingToken.safeTransfer(caller, amount); return true; } /// @notice Change unstaking time. Can be called only by the owner /// @param unstakingTime_ New unstaking process duration in seconds function setUnstakingTime(uint256 unstakingTime_) external onlyOwner returns (bool success) { _setUnstakingTime(unstakingTime_); return true; } function _getStrategyUnlockedRewards(Strategy memory strategy_) internal view returns (uint256 unlocked) { uint256 currentBlockNumber = getBlockNumber(); if (currentBlockNumber < strategy_.startBlockNumber || currentBlockNumber == lastUpdateBlockNumber) { return unlocked; } uint256 lastRewardedBlockNumber = Math.max(lastUpdateBlockNumber, strategy_.startBlockNumber); uint256 lastRewardableBlockNumber = Math.min(currentBlockNumber, strategy_.endBlockNumber); if (lastRewardedBlockNumber < lastRewardableBlockNumber) { uint256 blocksDiff = lastRewardableBlockNumber.sub(lastRewardedBlockNumber); unlocked = unlocked.add(blocksDiff.mul(strategy_.perBlockReward)); } } function _calculateUnstake( address account, uint256 amount, AttoDecimal.Instance memory price_ ) internal view returns (uint256 unstakedAmount, uint256 burnedAmount) { unstakedAmount = amount; burnedAmount = AttoDecimal.div(amount, price_).ceil(); uint256 balance = balanceOf(account); require(burnedAmount > 0, "Too small unstaking amount"); require(balance >= burnedAmount, "Not enough synthetic tokens"); uint256 remainingSyntheticBalance = balance.sub(burnedAmount); uint256 remainingStake = _price.mul(remainingSyntheticBalance).floor(); if (remainingStake < 10**18) { burnedAmount = balance; unstakedAmount = unstakedAmount.add(remainingStake); } } function _unlockRewardsAndStake() internal { (uint256 unlocked, bool currentStrategyEnded) = getUnlockedRewards(); if (currentStrategyEnded) { _currentStrategy = _nextStrategy; emit NextStrategyRemoved(); if (_currentStrategy.endBlockNumber != 0) { emit CurrentStrategyUpdated( _currentStrategy.perBlockReward, _currentStrategy.startBlockNumber, _currentStrategy.endBlockNumber ); } delete _nextStrategy; } unlocked = Math.min(unlocked, _lockedRewards); if (unlocked > 0) { emit RewardsUnlocked(unlocked); _lockedRewards = _lockedRewards.sub(unlocked); _totalStaked = _totalStaked.add(unlocked); } lastUpdateBlockNumber = getBlockNumber(); } function _update() internal { if (getBlockNumber() <= lastUpdateBlockNumber) return; _unlockRewardsAndStake(); _updatePrice(); } function _updatePrice() internal { uint256 totalStaked_ = _totalStaked; uint256 totalSupply_ = totalSupply(); if (totalSupply_ == 0) _price = _defaultPrice; else _price = AttoDecimal.div(totalStaked_, totalSupply_); emit PriceUpdated(_price.mantissa, AttoDecimal.BASE, AttoDecimal.EXPONENTIATION); } function _validateStrategyParameters( uint256 perBlockReward, uint256 startBlockNumber, uint256 duration ) internal view { require(duration > 0, "Duration is zero"); require(startBlockNumber >= getBlockNumber(), "Start block number lt current"); require(perBlockReward <= 188 * 10**18, "Per block reward overflow"); } function _setClaimingFeePercent(uint256 feePercent) internal { require(feePercent >= 0 && feePercent <= 100, "Invalid fee percent"); claimingFeePercent = feePercent; emit ClaimingFeePercentUpdated(feePercent); } function _setUnstakingTime(uint256 unstakingTime_) internal { _unstakingTime = unstakingTime_; emit UnstakingTimeUpdated(unstakingTime_); } function _beforeTokenTransfer( address from, address to, uint256 amount ) internal override { _update(); string memory errorText = "Minimal stake balance should be more or equal to 1 token"; if (from != address(0)) { uint256 fromNewBalance = _price.mul(balanceOf(from).sub(amount)).floor(); require(fromNewBalance >= MIN_STAKE_BALANCE || fromNewBalance == 0, errorText); } if (to != address(0)) { require(_price.mul(balanceOf(to).add(amount)).floor() >= MIN_STAKE_BALANCE, errorText); } } function _setCurrentStrategy( uint256 perBlockReward_, uint256 startBlockNumber_, uint256 endBlockNumber_ ) private { _currentStrategy = Strategy({ perBlockReward: perBlockReward_, startBlockNumber: startBlockNumber_, endBlockNumber: endBlockNumber_ }); emit CurrentStrategyUpdated(perBlockReward_, startBlockNumber_, endBlockNumber_); } function _stake( address staker, address payer, uint256 amount ) private returns (uint256 mintedAmount) { _update(); mintedAmount = AttoDecimal.div(amount, _price).floor(); require(mintedAmount > 0, "Too small staking amount"); _mint(staker, mintedAmount); _totalStaked = _totalStaked.add(amount); emit Staked(staker, payer, amount, mintedAmount); _stakingToken.safeTransferFrom(payer, address(this), amount); } modifier onlyPositiveAmount(uint256 amount) { require(amount > 0, "Amount is not positive"); _; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /* * @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 GSN 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 payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @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, so we distribute return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "../../GSN/Context.sol"; import "./IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of 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 { using SafeMath for uint256; using Address for address; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol) public { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view 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 value {ERC20} uses, unless {_setupDecimals} is * called. * * 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 returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, 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}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), 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}; * * Requirements: * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); 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) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is 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: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, 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 * * - `to` 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 = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(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); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(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 Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @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 to 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 { } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool); /** * @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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; import "./IERC20.sol"; import "../../math/SafeMath.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 SafeMath for uint256; 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' // solhint-disable-next-line max-line-length 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @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 // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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 functionCall(target, data, "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"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); if (success) { return returndata; } else { // 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor () internal { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; library AttoDecimal { using SafeMath for uint256; struct Instance { uint256 mantissa; } uint256 internal constant BASE = 10; uint256 internal constant EXPONENTIATION = 18; uint256 internal constant ONE_MANTISSA = BASE**EXPONENTIATION; uint256 internal constant ONE_TENTH_MANTISSA = ONE_MANTISSA / 10; uint256 internal constant HALF_MANTISSA = ONE_MANTISSA / 2; uint256 internal constant SQUARED_ONE_MANTISSA = ONE_MANTISSA * ONE_MANTISSA; uint256 internal constant MAX_INTEGER = uint256(-1) / ONE_MANTISSA; function maximum() internal pure returns (Instance memory) { return Instance({mantissa: uint256(-1)}); } function zero() internal pure returns (Instance memory) { return Instance({mantissa: 0}); } function one() internal pure returns (Instance memory) { return Instance({mantissa: ONE_MANTISSA}); } function convert(uint256 integer) internal pure returns (Instance memory) { return Instance({mantissa: integer.mul(ONE_MANTISSA)}); } function compare(Instance memory a, Instance memory b) internal pure returns (int8) { if (a.mantissa < b.mantissa) return -1; return int8(a.mantissa > b.mantissa ? 1 : 0); } function compare(Instance memory a, uint256 b) internal pure returns (int8) { return compare(a, convert(b)); } function add(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.add(b.mantissa)}); } function add(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.add(b.mul(ONE_MANTISSA))}); } function sub(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.sub(b.mantissa)}); } function sub(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.sub(b.mul(ONE_MANTISSA))}); } function sub(uint256 a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(ONE_MANTISSA).sub(b.mantissa)}); } function mul(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(b.mantissa) / ONE_MANTISSA}); } function mul(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(b)}); } function div(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(ONE_MANTISSA).div(b.mantissa)}); } function div(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mul(ONE_MANTISSA).div(b)}); } function div(uint256 a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(SQUARED_ONE_MANTISSA).div(b.mantissa)}); } function div(uint256 a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mul(ONE_MANTISSA).div(b)}); } function idiv(Instance memory a, Instance memory b) internal pure returns (uint256) { return a.mantissa.div(b.mantissa); } function idiv(Instance memory a, uint256 b) internal pure returns (uint256) { return a.mantissa.div(b.mul(ONE_MANTISSA)); } function idiv(uint256 a, Instance memory b) internal pure returns (uint256) { return a.mul(ONE_MANTISSA).div(b.mantissa); } function mod(Instance memory a, Instance memory b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mod(b.mantissa)}); } function mod(Instance memory a, uint256 b) internal pure returns (Instance memory) { return Instance({mantissa: a.mantissa.mod(b.mul(ONE_MANTISSA))}); } function mod(uint256 a, Instance memory b) internal pure returns (Instance memory) { if (a > MAX_INTEGER) return Instance({mantissa: a.mod(b.mantissa).mul(ONE_MANTISSA) % b.mantissa}); return Instance({mantissa: a.mul(ONE_MANTISSA).mod(b.mantissa)}); } function floor(Instance memory a) internal pure returns (uint256) { return a.mantissa / ONE_MANTISSA; } function ceil(Instance memory a) internal pure returns (uint256) { return (a.mantissa / ONE_MANTISSA) + (a.mantissa % ONE_MANTISSA > 0 ? 1 : 0); } function round(Instance memory a) internal pure returns (uint256) { return (a.mantissa / ONE_MANTISSA) + ((a.mantissa / ONE_TENTH_MANTISSA) % 10 >= 5 ? 1 : 0); } function eq(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa == b.mantissa; } function eq(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa == b * ONE_MANTISSA; } function gt(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa > b.mantissa; } function gt(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa > b * ONE_MANTISSA; } function gte(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa >= b.mantissa; } function gte(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return false; return a.mantissa >= b * ONE_MANTISSA; } function lt(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa < b.mantissa; } function lt(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return true; return a.mantissa < b * ONE_MANTISSA; } function lte(Instance memory a, Instance memory b) internal pure returns (bool) { return a.mantissa <= b.mantissa; } function lte(Instance memory a, uint256 b) internal pure returns (bool) { if (b > MAX_INTEGER) return true; return a.mantissa <= b * ONE_MANTISSA; } function isInteger(Instance memory a) internal pure returns (bool) { return a.mantissa % ONE_MANTISSA == 0; } function isPositive(Instance memory a) internal pure returns (bool) { return a.mantissa > 0; } function isZero(Instance memory a) internal pure returns (bool) { return a.mantissa == 0; } function sum(Instance[] memory array) internal pure returns (Instance memory result) { uint256 length = array.length; for (uint256 index = 0; index < length; index++) result = add(result, array[index]); } function toTuple(Instance memory a) internal pure returns ( uint256 mantissa, uint256 base, uint256 exponentiation ) { return (a.mantissa, BASE, EXPONENTIATION); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.12; abstract contract TwoStageOwnable { address private _nominatedOwner; address private _owner; function nominatedOwner() public view returns (address) { return _nominatedOwner; } function owner() public view returns (address) { return _owner; } event OwnerChanged(address indexed newOwner); event OwnerNominated(address indexed nominatedOwner); constructor(address owner_) internal { require(owner_ != address(0), "Owner is zero"); _setOwner(owner_); } function acceptOwnership() external returns (bool success) { require(msg.sender == _nominatedOwner, "Not nominated to ownership"); _setOwner(_nominatedOwner); return true; } function nominateNewOwner(address owner_) external onlyOwner returns (bool success) { _nominateNewOwner(owner_); return true; } modifier onlyOwner { require(msg.sender == _owner, "Not owner"); _; } function _nominateNewOwner(address owner_) internal { if (_nominatedOwner == owner_) return; require(_owner != owner_, "Already owner"); _nominatedOwner = owner_; emit OwnerNominated(owner_); } function _setOwner(address newOwner) internal { if (_owner == newOwner) return; _owner = newOwner; _nominatedOwner = address(0); emit OwnerChanged(newOwner); } }
{ "remappings": [], "optimizer": { "enabled": false, "runs": 200 }, "evmVersion": "constantinople", "libraries": { "": {} }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
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- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"string","name":"syntheticTokenName","type":"string"},{"internalType":"string","name":"syntheticTokenSymbol","type":"string"},{"internalType":"contract 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Unstaked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"UnstakingCanceled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"unstakingTime","type":"uint256"}],"name":"UnstakingTimeUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawed","type":"event"},{"inputs":[],"name":"MIN_STAKE_BALANCE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptOwnership","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"calculateUnstake","outputs":[{"internalType":"uint256","name":"unstakedAmount","type":"uint256"},{"internalType":"uint256","name":"burnedAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"cancelUnstaking","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"claim","outputs":[{"internalType":"uint256","name":"claimedAmount","type":"uint256"},{"internalType":"uint256","name":"burnedAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimFees","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimingFeePercent","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"perBlockReward_","type":"uint256"},{"internalType":"uint256","name":"startBlockNumber_","type":"uint256"},{"internalType":"uint256","name":"duration_","type":"uint256"}],"name":"createNewStrategy","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentStrategy","outputs":[{"components":[{"internalType":"uint256","name":"endBlockNumber","type":"uint256"},{"internalType":"uint256","name":"perBlockReward","type":"uint256"},{"internalType":"uint256","name":"startBlockNumber","type":"uint256"}],"internalType":"struct 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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
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
-----Decoded View---------------
Arg [0] : syntheticTokenName (string): Staked OM
Arg [1] : syntheticTokenSymbol (string): sOM
Arg [2] : stakingToken_ (address): 0x3593D125a4f7849a1B059E64F4517A86Dd60c95d
Arg [3] : owner_ (address): 0xd4eeE3D50588D7dee8Dcc42635E50093E0AA8Cc0
Arg [4] : claimingFeePercent_ (uint256): 2
Arg [5] : perBlockReward_ (uint256): 5000000000000000000
Arg [6] : startBlockNumber_ (uint256): 12098914
Arg [7] : duration_ (uint256): 1152000
Arg [8] : unstakingTime_ (uint256): 691200
Arg [9] : defaultPriceMantissa (uint256): 1000000000000000000
-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [2] : 0000000000000000000000003593d125a4f7849a1b059e64f4517a86dd60c95d
Arg [3] : 000000000000000000000000d4eee3d50588d7dee8dcc42635e50093e0aa8cc0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000002
Arg [5] : 0000000000000000000000000000000000000000000000004563918244f40000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000b89d62
Arg [7] : 0000000000000000000000000000000000000000000000000000000000119400
Arg [8] : 00000000000000000000000000000000000000000000000000000000000a8c00
Arg [9] : 0000000000000000000000000000000000000000000000000de0b6b3a7640000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000009
Arg [11] : 5374616b6564204f4d0000000000000000000000000000000000000000000000
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [13] : 734f4d0000000000000000000000000000000000000000000000000000000000
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