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Minimal Proxy Contract for 0x5defe07c503eea6f4b07344808fb85d3af170600
Contract Name:
SilicaV2_1
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ * */ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; import {AbstractSilicaV2_1} from "./AbstractSilicaV2_1.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "./interfaces/oracle/IOracle.sol"; import "./interfaces/oracle/IOracleRegistry.sol"; import "./libraries/math/RewardMath.sol"; contract SilicaV2_1 is AbstractSilicaV2_1 { /*/////////////////////////////////////////////////////////////// Constants //////////////////////////////////////////////////////////////*/ uint256 internal constant COMMODITY_TYPE = 0; // Consensus commodity type being sold /*/////////////////////////////////////////////////////////////// Constructor //////////////////////////////////////////////////////////////*/ constructor() ERC20("Silica", "SLC") {} /*/////////////////////////////////////////////////////////////// Getters //////////////////////////////////////////////////////////////*/ function decimals() public pure override returns (uint8) { return 15; } /// @notice Returns the commodity type the seller is selling with this contract /// @return The commodity type the seller is selling with this contract function getCommodityType() external pure override returns (uint256) { return COMMODITY_TYPE; } /// @notice Returns decimals of the Silica contract function getDecimals() external pure override returns (uint8) { return decimals(); } /// @notice Function to return the last day Silica was synced with Oracle /// @return uint32: Last day silica was synced with Oracle function _getLastIndexedDay() internal view override returns (uint32) { IOracle oracle = IOracle(IOracleRegistry(oracleRegistry).getOracleAddress(address(rewardToken), COMMODITY_TYPE)); uint32 lastIndexedDayMem = oracle.getLastIndexedDay(); require(lastIndexedDayMem != 0, "Invalid State"); return lastIndexedDayMem; } /// @notice Function to return the amount of rewards due by the seller to the contract on day inputed /// @param _day The day to query the reward due on /// @return uint256: The reward due function _getRewardDueOnDay(uint256 _day) internal view override returns (uint256) { IOracle oracle = IOracle(IOracleRegistry(oracleRegistry).getOracleAddress(address(rewardToken), COMMODITY_TYPE)); (, , uint256 networkHashrate, uint256 networkReward, , , ) = oracle.get(_day); return RewardMath._getMiningRewardDue(totalSupply(), networkReward, networkHashrate); } /// @notice Function to return total rewards due between _firstday (inclusive) and _lastday (inclusive) /// @dev This function is to be overridden by derived Silica contracts /// @param _firstDay The start day to query from /// @param _lastDay The end day to query until function _getRewardDueInRange(uint256 _firstDay, uint256 _lastDay) internal view override returns (uint256[] memory) { IOracle oracle = IOracle(IOracleRegistry(oracleRegistry).getOracleAddress(address(rewardToken), COMMODITY_TYPE)); (uint256[] memory hashrateArray, uint256[] memory rewardArray) = oracle.getInRange(_firstDay, _lastDay); uint256[] memory rewardDueArray = new uint256[](hashrateArray.length); uint256 totalSupplyCopy = totalSupply(); for (uint256 i; i < hashrateArray.length; ) { rewardDueArray[i] = RewardMath._getMiningRewardDue(totalSupplyCopy, rewardArray[i], hashrateArray[i]); unchecked { ++i; } } return rewardDueArray; } }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ * */ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; import "./libraries/math/PayoutMath.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/proxy/utils/Initializable.sol"; import {ISilicaV2_1} from "./interfaces/silica/ISilicaV2_1.sol"; import {SilicaV2_1Types} from "./libraries/SilicaV2_1Types.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {SilicaV2_1Storage} from "./storage/SilicaV2_1Storage.sol"; /** * @title Alkimiya AbstractSilicaV2_1 * @author Alkimiya Team * @notice This is the base to be inherited & implemented by Silica contracts * */ abstract contract AbstractSilicaV2_1 is ERC20, Initializable, ISilicaV2_1, SilicaV2_1Storage { /*/////////////////////////////////////////////////////////////// Constants //////////////////////////////////////////////////////////////*/ /// @notice Number of days between deploymentDay and firstDueDay uint256 internal constant DAYS_BETWEEN_DD_AND_FDD = 2; /*/////////////////////////////////////////////////////////////// Modifiers //////////////////////////////////////////////////////////////*/ modifier onlyBuyers() { require(balanceOf(msg.sender) != 0, "Not Buyer"); _; } modifier onlyOpen() { require(isOpen(), "Not Open"); _; } modifier onlyExpired() { require(isExpired(), "Not Expired"); _; } modifier onlyDefaulted() { if (defaultDay == 0) { _tryDefaultContract(); } _; } modifier onlyFinished() { if (finishDay == 0) { _tryFinishContract(); } _; } modifier onlyOwner() { require(msg.sender == owner, "Not Owner"); _; } modifier onlyOnePayout() { require(!didSellerCollectPayout, "Payout already collected"); didSellerCollectPayout = true; _; } /*/////////////////////////////////////////////////////////////// Initializer //////////////////////////////////////////////////////////////*/ /** * @notice Initialize a new SilicaV2_1 * @dev Sets the state of the new SilicaV2_1 clone * @param initializeData The struct to which to set the Silica's state */ function initialize(InitializeData calldata initializeData) external initializer { require( initializeData.rewardTokenAddress != address(0) && initializeData.paymentTokenAddress != address(0) && initializeData.oracleRegistry != address(0) && initializeData.sellerAddress != address(0), "Invalid Address" ); require(initializeData.lastDueDay >= initializeData.dayOfDeployment + DAYS_BETWEEN_DD_AND_FDD, "Invalid lastDueDay"); rewardToken = initializeData.rewardTokenAddress; paymentToken = initializeData.paymentTokenAddress; oracleRegistry = initializeData.oracleRegistry; owner = initializeData.sellerAddress; lastDueDay = uint32(initializeData.lastDueDay); firstDueDay = uint32(initializeData.dayOfDeployment + DAYS_BETWEEN_DD_AND_FDD); resourceAmount = initializeData.resourceAmount; reservedPrice = _calculateReservedPrice( initializeData.unitPrice, initializeData.lastDueDay - initializeData.dayOfDeployment - 1, decimals(), initializeData.resourceAmount ); require(reservedPrice > 0, "reservedPrice = 0"); initialCollateral = initializeData.collateralAmount; } /** * @notice Calculate the Reserved Price of the silica * @param unitPrice The price per unit * @param numDeposits The number of payments to be made during contract * @param _decimals The number of decimals of the SilicaV2_1 * @param _resourceAmount The quantity of the underlying resource */ function _calculateReservedPrice( uint256 unitPrice, uint256 numDeposits, uint256 _decimals, uint256 _resourceAmount ) internal pure returns (uint256) { return (unitPrice * _resourceAmount * numDeposits) / (10**_decimals); } /*/////////////////////////////////////////////////////////////// Contract states //////////////////////////////////////////////////////////////*/ /// @notice Returns the status of the contract /// @return SilicaV2_1Types.Status The current state of the Silica function getStatus() public view returns (SilicaV2_1Types.Status) { if (isOpen()) { return SilicaV2_1Types.Status.Open; } else if (isExpired()) { return SilicaV2_1Types.Status.Expired; } else if (isRunning()) { return SilicaV2_1Types.Status.Running; } else if (finishDay > 0 || isFinished()) { return SilicaV2_1Types.Status.Finished; } else if (defaultDay > 0 || isDefaulted()) { return SilicaV2_1Types.Status.Defaulted; } } /// @notice Check if contract is in open state /// @return bool: True is contract status is open state function isOpen() public view returns (bool) { return (_getLastIndexedDay() == firstDueDay - DAYS_BETWEEN_DD_AND_FDD); } /// @notice Check if contract is in expired state /// @return bool: True is contract status is expired state function isExpired() public view returns (bool) { return (defaultDay == 0 && finishDay == 0 && totalSupply() == 0 && _getLastIndexedDay() >= firstDueDay - 1); } /// @notice Check if contract is in defaulted state /// @return bool: True is contract status is defaulted state function isDefaulted() public view returns (bool) { return (getDayOfDefault() > 0); } /** * @notice Returns the day of default * @dev If X is returned, then the contract has paid X - firstDueDay payments. * @return uint256: Day of default (if defaulted) * */ function getDayOfDefault() public view returns (uint256) { if (finishDay > 0) revert("contract not defaulted"); if (defaultDay > 0) return defaultDay; uint256 firstDueDayMem = firstDueDay; uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDay, _getLastIndexedDay()); uint256 numDaysRequired = lastDayContractOwesReward < firstDueDayMem ? 0 : lastDayContractOwesReward + 1 - firstDueDayMem; // Contract hasn't progressed enough to default if (numDaysRequired == 0) return 0; (uint256 numDays, ) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDayMem, lastDayContractOwesReward ); // The rewardBalance is insufficient to cover numDaysRequired, hence defaulted if (numDays < numDaysRequired) { return firstDueDayMem + numDays; } else { return 0; } } /// @notice Function to set a contract as default /// @dev If the contract is not defaulted, revert function _tryDefaultContract() internal { uint256 firstDueDayMem = firstDueDay; uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDay, _getLastIndexedDay()); uint256 numDaysRequired = lastDayContractOwesReward < firstDueDayMem ? 0 : lastDayContractOwesReward + 1 - firstDueDayMem; // Contract hasn't progressed enough to default require(numDaysRequired > 0, "Not Defaulted"); (uint256 numDays, uint256 totalRewardDelivered) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDayMem, lastDayContractOwesReward ); // The rewardBalance is insufficient to cover numDaysRequired, hence defaulted if (numDays < numDaysRequired) { uint256 dayOfDefaultMem = firstDueDayMem + numDays; _defaultContract(dayOfDefaultMem, IERC20(rewardToken).balanceOf(address(this)), totalRewardDelivered); } else { revert("Not Defaulted"); } } /** * @notice Snapshots variables necessary to perform default settlements. * @dev This tx should only happen once in the Silica's lifetime. * @param _dayOfDefault The day on which default conditions were met * @param silicaRewardBalance The balance of reward tokens in the Silica * @param _totalRewardDelivered The total amount of reward that was deilivered * */ function _defaultContract( uint256 _dayOfDefault, uint256 silicaRewardBalance, uint256 _totalRewardDelivered ) internal { if (silicaRewardBalance > _totalRewardDelivered) { rewardExcess = silicaRewardBalance - _totalRewardDelivered; } defaultDay = uint32(_dayOfDefault); rewardDelivered = _totalRewardDelivered; resourceAmount = totalSupply(); totalUpfrontPayment = IERC20(paymentToken).balanceOf(address(this)); emit StatusChanged(SilicaV2_1Types.Status.Defaulted); } /// @notice Check if the contract is in running state /// @return bool: True if the contract status is Running function isRunning() public view returns (bool) { if (!isOpen() && !isExpired() && defaultDay == 0 && finishDay == 0) { uint256 firstDueDayMem = firstDueDay; uint256 lastDueDayMem = lastDueDay; uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDayMem, _getLastIndexedDay()); if (lastDayContractOwesReward < firstDueDayMem) return true; (uint256 numDays, ) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDayMem, lastDayContractOwesReward ); uint256 contractDurationDays = lastDayContractOwesReward + 1 - firstDueDayMem; uint256 maxContractDurationDays = lastDueDayMem + 1 - firstDueDayMem; // For contracts that progressed GE firstDueDay // Contract is running if it's progressed as far as it can, but not finished return numDays == contractDurationDays && numDays != maxContractDurationDays; } else { return false; } } /// @notice Check if contract is in finished state /// @return bool: True if the contract status is Finished function isFinished() public view returns (bool) { if (finishDay != 0) return true; uint256 firstDueDayMem = firstDueDay; uint256 lastDueDayMem = lastDueDay; uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDayMem, _getLastIndexedDay()); (uint256 numDays, ) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDayMem, lastDayContractOwesReward ); if (numDays == lastDueDayMem + 1 - firstDueDayMem) { return true; } return false; } /// @notice Function to set a contract status as Finished /// @dev If the contract hasn't finished, revert function _tryFinishContract() internal { uint256 firstDueDayMem = firstDueDay; uint256 lastDueDayMem = lastDueDay; uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDayMem, _getLastIndexedDay()); (uint256 numDays, uint256 totalRewardDelivered) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDayMem, lastDayContractOwesReward ); if (numDays == lastDueDayMem + 1 - firstDueDayMem) { // Set finishDay to non-zero value. Subsequent calls to onlyFinished functions should skip this function all together _finishContract(lastDueDayMem, IERC20(rewardToken).balanceOf(address(this)), totalRewardDelivered); } else { revert("Not Finished"); } } /// @notice Snapshots variables necessary to perform settlements /// @dev This tx should only happen once in the Silica's lifetime /// @param _finishDay Day on which the contract finish conditions were met /// @param silicaRewardBalance The reward token balance of the Silica /// @param _totalRewardDelivered The amount of reward which was deilivered function _finishContract( uint256 _finishDay, uint256 silicaRewardBalance, uint256 _totalRewardDelivered ) internal { if (silicaRewardBalance > _totalRewardDelivered) { rewardExcess = silicaRewardBalance - _totalRewardDelivered; } finishDay = uint32(_finishDay); rewardDelivered = _totalRewardDelivered; resourceAmount = totalSupply(); emit StatusChanged(SilicaV2_1Types.Status.Finished); } /// @notice Function to get the last day fulfilled and reward delivered /// @return lastDayFulfilled The final day on which rewards were deilvered /// @return rewardDelivered The amount of balance of the reward token that has been deilvered by the seller function getDaysAndRewardFulfilled() external view returns (uint256 lastDayFulfilled, uint256 rewardDelivered) { uint256 lastDueDayMem = lastDueDay; uint256 lastIndexedDayMem = _getLastIndexedDay(); uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDayMem, lastIndexedDayMem); uint256 rewardFulfilled = rewardDelivered == 0 ? IERC20(rewardToken).balanceOf(address(this)) : rewardDelivered; return _getDaysAndRewardFulfilled(rewardFulfilled, firstDueDay, lastDayContractOwesReward); } /// @notice Returns the number of days N fulfilled by this contract, as well as the reward delivered for all N days /// @param _rewardBalance Reward token balance /// @param _firstDueDay Day from which reward deposits have been required /// @param _lastDayContractOwesReward Final day reward deposits are due /// @return lastDayFulfilled The final day on which rewards were deilvered /// @return rewardDelivered The amount of balance of the reward token that has been deilvered by the seller function _getDaysAndRewardFulfilled( uint256 _rewardBalance, uint256 _firstDueDay, uint256 _lastDayContractOwesReward ) internal view returns (uint256 lastDayFulfilled, uint256 rewardDelivered) { if (_lastDayContractOwesReward < _firstDueDay) { return (0, 0); } uint256 totalDue; uint256[] memory rewardDueArray = _getRewardDueInRange(_firstDueDay, _lastDayContractOwesReward); for (uint256 i; i < rewardDueArray.length; ) { uint256 curDay = _firstDueDay + i; if (_rewardBalance < totalDue + rewardDueArray[i] + _getCollateralLocked(curDay)) { return (i, totalDue + _getCollateralLocked(curDay)); } totalDue += rewardDueArray[i]; unchecked { ++i; } } // Otherwise, contract delivered up to last day that it owes reward return (rewardDueArray.length, totalDue + _getCollateralLocked(_lastDayContractOwesReward)); } /*/////////////////////////////////////////////////////////////// Contract settlement and updates //////////////////////////////////////////////////////////////*/ /// @notice Function returns the accumulative rewards delivered /// @return uint256: Accumulative rewards delivered function getRewardDeliveredSoFar() external view returns (uint256) { if (rewardDelivered == 0) { (, uint256 totalRewardDelivered) = _getDaysAndRewardFulfilled( IERC20(rewardToken).balanceOf(address(this)), firstDueDay, getLastDayContractOwesReward(lastDueDay, _getLastIndexedDay()) ); return totalRewardDelivered; } else { return rewardDelivered; } } /// @notice Function returns the last day contract needs to deliver rewards /// @param _lastDueDay The Final day reward deposits are due /// @param lastIndexedDay The most recent day that has oracle data /// @return uint256: The last day reward deposits are due function getLastDayContractOwesReward(uint256 _lastDueDay, uint256 lastIndexedDay) public pure returns (uint256) { // Silica always owes up to DayX-1 in rewards return lastIndexedDay - 1 <= _lastDueDay ? lastIndexedDay - 1 : _lastDueDay; } /// @notice Function returns the Collateral Locked on the day inputed /// @param day The day for which to query the collateral value /// @return uint256: Collateral Locked on the day inputed function _getCollateralLocked(uint256 day) internal view returns (uint256) { uint256 firstDueDayMem = firstDueDay; uint256 initialCollateralAfterRelease = _getInitialCollateralAfterRelease(); if (day <= firstDueDayMem) { return initialCollateralAfterRelease; } (uint256 initCollateralReleaseDay, uint256 finalCollateralReleaseDay) = _getCollateralUnlockDays(firstDueDayMem); if (day >= finalCollateralReleaseDay) { return (0); } if (day >= initCollateralReleaseDay) { return ((initialCollateralAfterRelease * 3) / 4); } return (initialCollateralAfterRelease); } /// @notice Function that calculate the collateral based on purchased amount after contract starts function _getInitialCollateralAfterRelease() internal view returns (uint256) { return (totalSupply() * initialCollateral) / resourceAmount; } /// @notice Function that calculates the dates collateral gets partial release /// @param _firstDueDay The first day on which reward deposits were required /// @return initCollateralReleaseDay The first day collateral is released /// @return finalCollateralReleaseDay The last day collateral is released function _getCollateralUnlockDays(uint256 _firstDueDay) internal view returns (uint256 initCollateralReleaseDay, uint256 finalCollateralReleaseDay) { uint256 numDeposits = lastDueDay + 1 - _firstDueDay; initCollateralReleaseDay = numDeposits % 4 > 0 ? _firstDueDay + 1 + (numDeposits / 4) : _firstDueDay + (numDeposits / 4); finalCollateralReleaseDay = numDeposits % 2 > 0 ? _firstDueDay + 1 + (numDeposits / 2) : _firstDueDay + (numDeposits / 2); if (numDeposits == 2) { finalCollateralReleaseDay += 1; } } /// @notice Function returns the rewards amount the seller needs deliver for next Oracle update /// @return rewardDueNextOracleUpdate Reward amount due to be deposited at next Oracle write operation function getRewardDueNextOracleUpdate() external view returns (uint256 rewardDueNextOracleUpdate) { if (finishDay > 0 || defaultDay > 0) return 0; uint256 nextIndexedDay = _getLastIndexedDay() + 1; uint256 firstDueDayMem = firstDueDay; if (nextIndexedDay < firstDueDayMem) { return (0); } uint256 lastDayContractOwesReward = getLastDayContractOwesReward(lastDueDay, nextIndexedDay); uint256 rewardBalance = IERC20(rewardToken).balanceOf(address(this)); uint256[] memory rewardDueArray = _getRewardDueInRange(firstDueDayMem, lastDayContractOwesReward); uint256 totalDue; uint256 balanceNeeded; for (uint256 i; i < rewardDueArray.length;) { uint256 curDay = firstDueDayMem + i; totalDue += rewardDueArray[i]; if (balanceNeeded < totalDue + _getCollateralLocked(curDay)) { balanceNeeded = totalDue + _getCollateralLocked(curDay); } unchecked { ++i; } } if (balanceNeeded <= rewardBalance) { return 0; } else { return (balanceNeeded - rewardBalance); } } /** * @notice Processes a buyer's upfront payment to purchase hashpower/staking using paymentTokens. * Silica is minted proportional to purchaseAmount and transfered to buyer. * @dev confirms the buyer's payment, mint the Silicas and transfer the tokens. * @param amountSpecified The amount to deposit * @return mintAmount The amount of Silica tokens that were minted */ function deposit(uint256 amountSpecified) external onlyOpen returns (uint256 mintAmount) { require(amountSpecified > 0, "Invalid Value"); mintAmount = _deposit(msg.sender, msg.sender, totalSupply(), amountSpecified); _mint(msg.sender, mintAmount); } /** * @notice Processes a buyer's upfront payment to purchase hashpower/staking using paymentTokens. * Silica is minted proportional to purchaseAmount and transfered to the address specified _to. * @dev Confirms the buyer's payment, mint the Silicas and transfer the tokens. * @param _to The address to send the minted Silica to * @param amountSpecified The amount to deposit * @return mintAmount The amount of Silica tokens that were minted */ function proxyDeposit(address _to, uint256 amountSpecified) external onlyOpen returns (uint256 mintAmount) { require(_to != address(0), "Invalid Address"); require(amountSpecified > 0, "Invalid Value"); mintAmount = _deposit(msg.sender, _to, totalSupply(), amountSpecified); _mint(_to, mintAmount); } /// @notice Internal function to process buyer's deposit /// @param from The address of the sender /// @param to The address of the recipient /// @param _totalSupply Current amount of Silica /// @param amountSpecified The amount to transfer /// @return mintAmount The amount of Silica tokens minted function _deposit( address from, address to, uint256 _totalSupply, uint256 amountSpecified ) internal returns (uint256 mintAmount) { mintAmount = _getMintAmount(resourceAmount, amountSpecified, reservedPrice); require(_totalSupply + mintAmount <= resourceAmount, "Insufficient Supply"); emit Deposit(to, amountSpecified, mintAmount); _transferPaymentTokenFrom(from, address(this), amountSpecified); } /// @notice Function that returns the minted Silica amount from purchase amount /// @param consensusResource The amount ofunderlying resource of the contract /// @param purchaseAmount The amount purchased /// @param _reservedPrice The calculated rerserved price, see _calculateReservedPrice() function _getMintAmount( uint256 consensusResource, uint256 purchaseAmount, uint256 _reservedPrice ) internal pure returns (uint256) { return (consensusResource * purchaseAmount) / _reservedPrice; } /// @notice Internal function to safely transfer payment token /// @param from The sender address /// @param to The recipient address /// @param amount The amount of payment token to transfer function _transferPaymentTokenFrom( address from, address to, uint256 amount ) internal { SafeERC20.safeTransferFrom(IERC20(paymentToken), from, to, amount); } /// @notice Function that buyer calls to collect reward when silica is finished function buyerCollectPayout() external onlyFinished onlyBuyers returns (uint256 rewardPayout) { uint256 buyerBalance = balanceOf(msg.sender); _burn(msg.sender, buyerBalance); return _transferBuyerPayoutOnFinish(msg.sender, buyerBalance); } /// @notice Internal function to process rewards to Buyer when contract is Finished /// @dev Uses PayoutMath library /// @param buyerAddress The address of the resource buyer /// @param buyerBalance The amount of Silica the buyer holds /// @param rewardPayout The amount of reward token send to the buyer function _transferBuyerPayoutOnFinish(address buyerAddress, uint256 buyerBalance) internal returns (uint256 rewardPayout) { rewardPayout = PayoutMath._getBuyerRewardPayout(rewardDelivered, buyerBalance, resourceAmount); emit BuyerCollectPayout(rewardPayout, 0, buyerAddress, buyerBalance); _transferRewardToken(buyerAddress, rewardPayout); } /// @notice Internal function to safely transfer rewards to Buyer /// @param to The address of the recipient of the reward tokens /// @param amount The number of reward tokens to send function _transferRewardToken(address to, uint256 amount) internal { SafeERC20.safeTransfer(IERC20(rewardToken), to, amount); } /// @notice Function that buyer calls to settle defaulted contract /// @dev This function can only be called by the buyers when the contract is in the defaulted state /// @return rewardPayout The amount of reward tokens sent to buyer /// @return paymentPayout The amount of payment tokens sent to buyer function buyerCollectPayoutOnDefault() external onlyDefaulted onlyBuyers returns (uint256 rewardPayout, uint256 paymentPayout) { uint256 buyerBalance = balanceOf(msg.sender); _burn(msg.sender, buyerBalance); return _transferBuyerPayoutOnDefault(msg.sender, buyerBalance); } /// @notice Internal funtion to process rewards and payment return to Buyer when contract is default /// @return rewardPayout The amount of reward tokens sent to buyer /// @return paymentPayout The amount of payment tokens sent to buyer function _transferBuyerPayoutOnDefault(address buyerAddress, uint256 buyerBalance) internal returns (uint256 rewardPayout, uint256 paymentPayout) { rewardPayout = PayoutMath._getRewardTokenPayoutToBuyerOnDefault(buyerBalance, rewardDelivered, resourceAmount); //rewardDelivered in the case of a default represents the rewardTokenBalance of the contract at default uint256 firstDueDayMem = firstDueDay; uint256 numOfDepositsRequired = lastDueDay + 1 - firstDueDayMem; paymentPayout = PayoutMath._getPaymentTokenPayoutToBuyerOnDefault( buyerBalance, totalUpfrontPayment, resourceAmount, PayoutMath._getHaircut(defaultDay - firstDueDayMem, numOfDepositsRequired) ); emit BuyerCollectPayout(rewardPayout, paymentPayout, buyerAddress, buyerBalance); _transferRewardToken(buyerAddress, rewardPayout); if (paymentPayout > 0) { _transferPaymentToken(buyerAddress, paymentPayout); } } /// @notice Internal funtion to safely transfer payment return to Buyer /// @param to The address of the recipient of the payment token transfer /// @param amount The amount of payment tokens to transfer to the to address function _transferPaymentToken(address to, uint256 amount) internal { SafeERC20.safeTransfer(IERC20(paymentToken), to, amount); } /// @notice Gets the owner of silica function getOwner() external view override returns (address) { return owner; } /// @notice Gets reward token address function getRewardToken() external view override returns (address) { return address(rewardToken); } /// @notice Gets the Payment token address function getPaymentToken() external view override returns (address) { return address(paymentToken); } /// @notice Returns the last day of reward the seller is selling with this contract /// @return uint32: The last day of reward the seller is selling with this contract function getLastDueDay() external view override returns (uint32) { return lastDueDay; } /// @notice Function seller calls to settle finished silica /// @dev Only the owner(seller) can call this function when the contract is in the finished state /// @dev This function can only be called once /// @return paymentTokenPayout The nunber of payment tokens transferred to the seller address /// @return rewardTokenExcess The number of reward tokens left in the contract transferred to the seller address function sellerCollectPayout() external onlyOwner onlyFinished onlyOnePayout returns (uint256 paymentTokenPayout, uint256 rewardTokenExcess) { paymentTokenPayout = IERC20(paymentToken).balanceOf(address(this)); rewardTokenExcess = rewardExcess; emit SellerCollectPayout(paymentTokenPayout, rewardTokenExcess); _transferPaymentToSeller(paymentTokenPayout); if (rewardTokenExcess > 0) { _transferRewardToSeller(rewardTokenExcess); } } /// @notice Function seller calls to settle defaulted contract /// @dev Only the owner(seller) can call this function when the contract is in the defaulted state /// @dev This function can only be called once /// @return paymentTokenPayout The nunber of payment tokens transferred to the seller address /// @return rewardTokenExcess The number of reward tokens left in the contract transferred to the seller address function sellerCollectPayoutDefault() external onlyOwner onlyDefaulted onlyOnePayout returns (uint256 paymentTokenPayout, uint256 rewardTokenExcess) { uint256 firstDueDayMem = firstDueDay; uint256 numOfDepositsRequired = lastDueDay + 1 - firstDueDayMem; uint256 haircut = PayoutMath._getHaircut(defaultDay - firstDueDayMem, numOfDepositsRequired); paymentTokenPayout = PayoutMath._getRewardPayoutToSellerOnDefault(totalUpfrontPayment, haircut); rewardTokenExcess = rewardExcess; emit SellerCollectPayout(paymentTokenPayout, rewardTokenExcess); _transferPaymentToSeller(paymentTokenPayout); if (rewardTokenExcess > 0) { _transferRewardToSeller(rewardTokenExcess); } } /// @notice Function seller calls to settle expired contract /// @dev only the owner(seller) can call this function when the contract is in the expired state /// @dev This function can only be called once /// @return rewardTokenPayout The nunber of payment tokens transferred to the seller address function sellerCollectPayoutExpired() external onlyExpired onlyOwner returns (uint256 rewardTokenPayout) { rewardTokenPayout = IERC20(rewardToken).balanceOf(address(this)); _transferRewardToSeller(rewardTokenPayout); emit SellerCollectPayout(0, rewardTokenPayout); } /// @notice Internal funtion to safely transfer payment to Seller /// @param amount The number of payment tokens to transfer to Seller function _transferPaymentToSeller(uint256 amount) internal { SafeERC20.safeTransfer(IERC20(paymentToken), owner, amount); } /// @notice Internal funtion to safely transfer excess reward to Seller /// @param amount The number of reward tokens to transfer to Seller function _transferRewardToSeller(uint256 amount) internal { SafeERC20.safeTransfer(IERC20(rewardToken), owner, amount); } /// @notice Function to return the reward due on a given day /// @dev This function is to be overridden by derived Silica contracts /// @param _day The day to query the reward due on function _getRewardDueOnDay(uint256 _day) internal view virtual returns (uint256); /// @notice Function to return the last day silica is synced with Oracle /// @dev This function is to be overridden by derived Silica contracts /// @return uint32: Last day for which there is Oracle data function _getLastIndexedDay() internal view virtual returns (uint32); /// @notice Function to return total rewards due between _firstday (inclusive) and _lastday (inclusive) /// @dev This function is to be overridden by derived Silica contracts /// @param _firstDay The start day to query from /// @param _lastDay The end day to query until function _getRewardDueInRange(uint256 _firstDay, uint256 _lastDay) internal view virtual returns (uint256[] memory); /// @notice Function to return contract reserved price /// @return uint256: The reserved price function getReservedPrice() external view returns (uint256) { return reservedPrice; } }
// 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 pragma solidity 0.8.19; /** * @title Alkimiya Oracle * @author Alkimiya Team * @notice Main interface for Reward Token Oracle contracts */ interface IOracle { event OracleUpdate( address indexed caller, uint256 indexed referenceDay, uint256 indexed referenceBlock, uint256 hashrate, uint256 reward, uint256 fees, uint256 difficulty, uint256 timestamp ); /** * @notice Function to return the AlkimiyaIndex on a given day * @dev Timestamp must be non-zero indicating that there is an entry to read * @param _referenceDay The day whose index is to be returned * */ function get(uint256 _referenceDay) external view returns ( uint256 date, uint256 referenceBlock, uint256 hashrate, uint256 reward, uint256 fees, uint256 difficulty, uint256 timestamp ); /** * @notice Function to return array of oracle data between firstday and lastday (inclusive) * @dev The days passed in are inclusive values * @param _firstDay The starting day whose index is to be returned * @param _lastDay The final day whose index is to be returned * */ function getInRange(uint256 _firstDay, uint256 _lastDay) external view returns (uint256[] memory hashrateArray, uint256[] memory rewardArray); /** * @notice Function to check if Oracle has been updated on a given day * @dev Days for which function calls return true have an AlkimiyaIndex entry * @param _referenceDay The day to check that the Oracle has an entry for */ function isDayIndexed(uint256 _referenceDay) external view returns (bool); /** * @notice Return the last day on which the Oracle was updated */ function getLastIndexedDay() external view returns (uint32); /** * @notice Function to update Oracle Index * @dev Creates new instance of AlkimiyaIndex corresponding to _referenceDay in index mapping * @param _referenceDay The day to create AlkimiyaIndex entry for * @param _referenceBlock The block to be referenced * @param _hashrate The hashrate of the given day * @param _reward The staking reward on the given day * @param _fees The fees on given day * @param _difficulty The block difficulty on the given day * @param signature The signature of the Oracle calculator * */ function updateIndex( uint256 _referenceDay, uint256 _referenceBlock, uint256 _hashrate, uint256 _reward, uint256 _fees, uint256 _difficulty, bytes memory signature ) external returns (bool success); }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; /** * @title Oracle Registry Interface * @author Alkimiya Team * @notice Alkimiya Oracle addresses * */ interface IOracleRegistry { event OracleRegistered(address token, uint256 oracleType, address oracleAddr); function getOracleAddress(address _token, uint256 _oracleType) external view returns (address); function setOracleAddress( address _token, uint256 _oracleType, address _oracleAddr ) external; }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; /** * @title Reward Math Library * @author Alkimiya Team * @notice Calculations for when buyer initiates default */ library RewardMath { /// @notice Function to calculate the mining reward due by the seller /// @param _hashrate Underlying hashrate amount /// @param _networkReward Snapshot of the total network reward (block subsidy + fees) /// @param _networkHashrate The hashrate of the network (The basic unit of measurement of hashpower. Measures the number of SHA256d computations performed per second) function _getMiningRewardDue( uint256 _hashrate, uint256 _networkReward, uint256 _networkHashrate ) internal pure returns (uint256) { return (_hashrate * _networkReward) / _networkHashrate; } /// @notice Function to calculate the reward due by the seller for Eth Staking Silica /// @param _stakedAmount The amount that has been staked /// @param _baseRewardPerIncrementPerDay The amount paid to the blockspace producer from the protocol, through inflation. /// @param @decimals The amount of decimals of the Silica /// @return uint256: The amount of reward tokens due function _getEthStakingRewardDue( uint256 _stakedAmount, uint256 _baseRewardPerIncrementPerDay, uint8 decimals ) internal pure returns (uint256) { return (_stakedAmount * _baseRewardPerIncrementPerDay) / (10**decimals); } }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ * */ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; /** * @title Payout Math Library * @author Alkimiya Team * @notice Calculations for when buyer initiates default */ library PayoutMath { /*/////////////////////////////////////////////////////////////// Constants //////////////////////////////////////////////////////////////*/ uint256 internal constant SCALING_FACTOR = 1e8; uint128 internal constant FIXED_POINT_SCALE_VALUE = 10**14; uint128 internal constant FIXED_POINT_BASE = 10**6; uint32 internal constant HAIRCUT_BASE_PCT = 80; /*/////////////////////////////////////////////////////////////// Functionality //////////////////////////////////////////////////////////////*/ /** * @notice Returns haircut in fixed-point (base = 100000000 = 1). * @dev Granting 6 decimals precision. 1 - (0.8) * (day/contract)^3 * @param _numDepositsCompleted The number of days on which deposits have been successfully completed * @param _contractNumberOfDeposits The number of days on which deposits are to be completed in total in the contract * @return uint256: Haircut */ function _getHaircut(uint256 _numDepositsCompleted, uint256 _contractNumberOfDeposits) internal pure returns (uint256) { uint256 contractNumberOfDepositsCubed = uint256(_contractNumberOfDeposits)**3; uint256 multiplier = ((_numDepositsCompleted**3) * FIXED_POINT_SCALE_VALUE) / (contractNumberOfDepositsCubed); uint256 result = (HAIRCUT_BASE_PCT * multiplier) / (100 * FIXED_POINT_BASE); return (FIXED_POINT_BASE * 100) - result; } /** * @notice Calculates reward given to buyer when contract defaults. * @dev result = tokenBalance * (totalReward / hashrate) * @param _buyerTokenBalance The Silica balance of the buyer * @param _totalRewardDelivered The balance of reward tokens delivered by the seller * @param _totalSilicaMinted The total amount of Silica that have been minted * @return uint256: The number of reward tokens to be transferred to the buyer on event of contract default */ function _getRewardTokenPayoutToBuyerOnDefault( uint256 _buyerTokenBalance, uint256 _totalRewardDelivered, uint256 _totalSilicaMinted ) internal pure returns (uint256) { return (_buyerTokenBalance * _totalRewardDelivered) / _totalSilicaMinted; } /** * @notice Calculates payment returned to buyer when contract defaults. * @dev result = haircut * totalpayment tokenBalance / hashrateSold * @param _buyerTokenBalance The Silica balance of the buyer * @param _totalUpfrontPayment The amount of payment tokens made at contract start * @param _totalSilicaMinted The total amount of Silica that have been minted * @param _haircut The haircut, see _getHaircut() * @return uint256: The amount of payment tokens to be sent to buyer in the event of a contract default */ function _getPaymentTokenPayoutToBuyerOnDefault( uint256 _buyerTokenBalance, uint256 _totalUpfrontPayment, uint256 _totalSilicaMinted, uint256 _haircut ) internal pure returns (uint256) { return (_buyerTokenBalance * _totalUpfrontPayment * _haircut) / (_totalSilicaMinted * SCALING_FACTOR); } /// @notice Calculates reward given to seller when contract defaults. /// @param _totalUpfrontPayment The amount of payment tokens made at contract start /// @param _haircutPct The scaled haircut percent /// @return uint256: Reward token amount to be sent to seller in event of contraact default function _getRewardPayoutToSellerOnDefault(uint256 _totalUpfrontPayment, uint256 _haircutPct) internal pure returns (uint256) { require(_haircutPct <= 100000000, "Scaled haircut PCT cannot be greater than 100000000"); uint256 haircutPctRemainder = uint256(100000000) - _haircutPct; return (haircutPctRemainder * _totalUpfrontPayment) / 100000000; } /// @notice Calculaed the Reserved Price for a contract /// @param unitPrice The price per unit /// @param resourceAmount The amount of underlying resource /// @param numDeposits The number of deposits required in the contract /// @param decimals The number of decimals of the Silica function _calculateReservedPrice( uint256 unitPrice, uint256 resourceAmount, uint256 numDeposits, uint256 decimals ) internal pure returns (uint256) { return (unitPrice * resourceAmount * numDeposits) / (10**decimals); } /// @notice Calculated the amount of reward tokens to be sent to the buyer /// @param rewardDelivered The amount of reward tokens deposited /// @param buyerBalance The Silica balance of the buyer address /// @param resourceAmount The amount of underlying resource /// @return uint256: The amount of reward tokens to be paid to the buyer function _getBuyerRewardPayout( uint256 rewardDelivered, uint256 buyerBalance, uint256 resourceAmount ) internal pure returns (uint256) { return (rewardDelivered * buyerBalance) / resourceAmount; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol) pragma solidity ^0.8.2; import "../../utils/Address.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in * case an upgrade adds a module that needs to be initialized. * * For example: * * [.hljs-theme-light.nopadding] * ```solidity * contract MyToken is ERC20Upgradeable { * function initialize() initializer public { * __ERC20_init("MyToken", "MTK"); * } * } * * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable { * function initializeV2() reinitializer(2) public { * __ERC20Permit_init("MyToken"); * } * } * ``` * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. * * [CAUTION] * ==== * Avoid leaving a contract uninitialized. * * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() { * _disableInitializers(); * } * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. * @custom:oz-retyped-from bool */ uint8 private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Triggered when the contract has been initialized or reinitialized. */ event Initialized(uint8 version); /** * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope, * `onlyInitializing` functions can be used to initialize parent contracts. * * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a * constructor. * * Emits an {Initialized} event. */ modifier initializer() { bool isTopLevelCall = !_initializing; require( (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1), "Initializable: contract is already initialized" ); _initialized = 1; if (isTopLevelCall) { _initializing = true; } _; if (isTopLevelCall) { _initializing = false; emit Initialized(1); } } /** * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be * used to initialize parent contracts. * * A reinitializer may be used after the original initialization step. This is essential to configure modules that * are added through upgrades and that require initialization. * * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer` * cannot be nested. If one is invoked in the context of another, execution will revert. * * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in * a contract, executing them in the right order is up to the developer or operator. * * WARNING: setting the version to 255 will prevent any future reinitialization. * * Emits an {Initialized} event. */ modifier reinitializer(uint8 version) { require(!_initializing && _initialized < version, "Initializable: contract is already initialized"); _initialized = version; _initializing = true; _; _initializing = false; emit Initialized(version); } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} and {reinitializer} modifiers, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } /** * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call. * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized * to any version. It is recommended to use this to lock implementation contracts that are designed to be called * through proxies. * * Emits an {Initialized} event the first time it is successfully executed. */ function _disableInitializers() internal virtual { require(!_initializing, "Initializable: contract is initializing"); if (_initialized != type(uint8).max) { _initialized = type(uint8).max; emit Initialized(type(uint8).max); } } /** * @dev Returns the highest version that has been initialized. See {reinitializer}. */ function _getInitializedVersion() internal view returns (uint8) { return _initialized; } /** * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}. */ function _isInitializing() internal view returns (bool) { return _initializing; } }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; import {SilicaV2_1Types} from "../../libraries/SilicaV2_1Types.sol"; /** * @title SilicaV2_1 Interface * @author Alkimiya Team * @notice A Silica contract lists hashrate for sale * @dev The Silica interface is broken up into smaller interfaces */ interface ISilicaV2_1 { /*/////////////////////////////////////////////////////////////// Events //////////////////////////////////////////////////////////////*/ event Deposit(address indexed buyer, uint256 purchaseAmount, uint256 mintedTokens); event BuyerCollectPayout(uint256 rewardTokenPayout, uint256 paymentTokenPayout, address buyerAddress, uint256 burntAmount); event SellerCollectPayout(uint256 paymentTokenPayout, uint256 rewardTokenExcess); event StatusChanged(SilicaV2_1Types.Status status); struct InitializeData { address rewardTokenAddress; address paymentTokenAddress; address oracleRegistry; address sellerAddress; uint256 dayOfDeployment; uint256 lastDueDay; uint256 unitPrice; uint256 resourceAmount; uint256 collateralAmount; } /// @notice Returns the amount of rewards the seller must have delivered before next update /// @return rewardDueNextOracleUpdate amount of rewards the seller must have delivered before next update function getRewardDueNextOracleUpdate() external view returns (uint256); /// @notice Initializes the contract /// @param initializeData is the address of the token the seller is selling function initialize(InitializeData memory initializeData) external; /// @notice Function called by buyer to deposit payment token in the contract in exchange for Silica tokens /// @param amountSpecified is the amount that the buyer wants to deposit in exchange for Silica tokens function deposit(uint256 amountSpecified) external returns (uint256); /// @notice Called by the swapProxy to make a deposit in the name of a buyer /// @param _to the address who should receive the Silica Tokens /// @param amountSpecified is the amount the swapProxy is depositing for the buyer in exchange for Silica tokens function proxyDeposit(address _to, uint256 amountSpecified) external returns (uint256); /// @notice Function the buyer calls to collect payout when the contract status is Finished function buyerCollectPayout() external returns (uint256 rewardTokenPayout); /// @notice Function the buyer calls to collect payout when the contract status is Defaulted function buyerCollectPayoutOnDefault() external returns (uint256 rewardTokenPayout, uint256 paymentTokenPayout); /// @notice Function the seller calls to collect payout when the contract status is Finised function sellerCollectPayout() external returns (uint256 paymentTokenPayout, uint256 rewardTokenExcess); /// @notice Function the seller calls to collect payout when the contract status is Defaulted function sellerCollectPayoutDefault() external returns (uint256 paymentTokenPayout, uint256 rewardTokenExcess); /// @notice Function the seller calls to collect payout when the contract status is Expired function sellerCollectPayoutExpired() external returns (uint256 rewardTokenPayout); /// @notice Returns the owner of this Silica /// @return address: owner address function getOwner() external view returns (address); /// @notice Returns the Payment Token accepted in this Silica /// @return Address: Token Address function getPaymentToken() external view returns (address); /// @notice Returns the rewardToken address. The rewardToken is the token fo wich are made the rewards the seller is selling /// @return The rewardToken address. The rewardToken is the token fo wich are made the rewards the seller is selling function getRewardToken() external view returns (address); /// @notice Returns the last day of reward the seller is selling with this contract /// @return The last day of reward the seller is selling with this contract function getLastDueDay() external view returns (uint32); /// @notice Returns the commodity type the seller is selling with this contract /// @return The commodity type the seller is selling with this contract function getCommodityType() external pure returns (uint256); /// @notice Get the current status of the contract /// @return status: The current status of the contract function getStatus() external view returns (SilicaV2_1Types.Status); /// @notice Returns the day of default. /// @return day: The day the contract defaults function getDayOfDefault() external view returns (uint256); /// @return lastDayFulfilled - number of days fulfilled /// @return rewardDelivered - reward fulfilled plus collateral function getDaysAndRewardFulfilled() external view returns (uint256 lastDayFulfilled, uint256 rewardDelivered); /// @notice Returns true if contract is in Open status function isOpen() external view returns (bool); /// @notice Returns true if contract is in Running status function isRunning() external view returns (bool); /// @notice Returns true if contract is in Expired status function isExpired() external view returns (bool); /// @notice Returns true if contract is in Defaulted status function isDefaulted() external view returns (bool); /// @notice Returns true if contract is in Finished status function isFinished() external view returns (bool); /// @notice Returns amount of rewards delivered so far by contract function getRewardDeliveredSoFar() external view returns (uint256); /// @notice Returns the most recent day the contract owes in rewards /// @dev The returned value does not indicate rewards have been fulfilled up to that day /// This only returns the most recent day the contract should deliver rewards function getLastDayContractOwesReward(uint256 lastDueDay, uint256 lastIndexedDay) external view returns (uint256); /// @notice Returns the reserved price of the contract function getReservedPrice() external view returns (uint256); /// @notice Returns decimals of the contract function getDecimals() external pure returns (uint8); }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; library SilicaV2_1Types { enum Status { Open, Running, Expired, Defaulted, Finished } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/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; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ 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)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ 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"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to * 0 before setting it to a non-zero value. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ 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"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation 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). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // 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 cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } }
/** _ _ _ _ _ / \ | | | _(_)_ __ ___ (_)_ _ __ _ / _ \ | | |/ / | '_ ` _ \| | | | |/ _` | / ___ \| | <| | | | | | | | |_| | (_| | /_/ \_\_|_|\_\_|_| |_| |_|_|\__, |\__,_| |___/ **/ // SPDX-License-Identifier: MIT pragma solidity 0.8.19; import {SilicaV2_1Types} from "../libraries/SilicaV2_1Types.sol"; /** * @title Alkimiya Silica Storage * @author Alkimiya Team * @notice This is base storage to be inherited by derived Silica contracts * */ abstract contract SilicaV2_1Storage { address public rewardToken; //Slot 0 address public paymentToken; //Slot 1 address public oracleRegistry; //Slot 2 address public owner; //Slot 3 uint32 public finishDay; //Slot 3 uint32 public firstDueDay; //Slot 3 uint32 public lastDueDay; //Slot 3 address public silicaFactory; //Slot 4 uint32 public defaultDay; //Slot 4 bool public didSellerCollectPayout; //Slot 4 SilicaV2_1Types.Status status; uint256 public initialCollateral; //Slot 5 uint256 public resourceAmount; uint256 public reservedPrice; uint256 public rewardDelivered; uint256 public totalUpfrontPayment; uint256 public rewardExcess; }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (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 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); }
// 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 (last updated v4.9.0) (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 * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [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://consensys.net/diligence/blog/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/v0.8.0/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 (last updated v4.9.0) (token/ERC20/extensions/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); }
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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.