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Latest 25 from a total of 27 transactions
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Settle | 12724013 | 1167 days ago | IN | 0 ETH | 0.0126794 | ||||
Settle | 12691344 | 1172 days ago | IN | 0 ETH | 0.00340377 | ||||
Settle | 12690400 | 1172 days ago | IN | 0 ETH | 0.00868951 | ||||
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Settle | 12623400 | 1182 days ago | IN | 0 ETH | 0.00367547 | ||||
Settle | 12595081 | 1187 days ago | IN | 0 ETH | 0.00665441 | ||||
Settle | 12590013 | 1188 days ago | IN | 0 ETH | 0.01206418 | ||||
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Settle | 12290547 | 1234 days ago | IN | 0 ETH | 0.02260456 | ||||
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Settle | 12290477 | 1234 days ago | IN | 0 ETH | 0.03126231 |
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Contract Name:
ExchangerWithVirtualSynth
Compiler Version
v0.5.16+commit.9c3226ce
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-04-22 */ /* ____ __ __ __ _ / __/__ __ ___ / /_ / / ___ / /_ (_)__ __ _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ / /___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\ /___/ * Synthetix: ExchangerWithVirtualSynth.sol * * Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/ExchangerWithVirtualSynth.sol * Docs: https://docs.synthetix.io/contracts/ExchangerWithVirtualSynth * * Contract Dependencies: * - ERC20 * - Exchanger * - IAddressResolver * - IERC20 * - IExchanger * - IVirtualSynth * - MinimalProxyFactory * - MixinResolver * - MixinSystemSettings * - Owned * Libraries: * - SafeDecimalMath * - SafeMath * * MIT License * =========== * * Copyright (c) 2021 Synthetix * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */ pragma solidity ^0.5.16; // https://docs.synthetix.io/contracts/source/contracts/owned contract Owned { address public owner; address public nominatedOwner; constructor(address _owner) public { require(_owner != address(0), "Owner address cannot be 0"); owner = _owner; emit OwnerChanged(address(0), _owner); } function nominateNewOwner(address _owner) external onlyOwner { nominatedOwner = _owner; emit OwnerNominated(_owner); } function acceptOwnership() external { require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership"); emit OwnerChanged(owner, nominatedOwner); owner = nominatedOwner; nominatedOwner = address(0); } modifier onlyOwner { _onlyOwner(); _; } function _onlyOwner() private view { require(msg.sender == owner, "Only the contract owner may perform this action"); } event OwnerNominated(address newOwner); event OwnerChanged(address oldOwner, address newOwner); } // https://docs.synthetix.io/contracts/source/interfaces/iaddressresolver interface IAddressResolver { function getAddress(bytes32 name) external view returns (address); function getSynth(bytes32 key) external view returns (address); function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address); } // https://docs.synthetix.io/contracts/source/interfaces/isynth interface ISynth { // Views function currencyKey() external view returns (bytes32); function transferableSynths(address account) external view returns (uint); // Mutative functions function transferAndSettle(address to, uint value) external returns (bool); function transferFromAndSettle( address from, address to, uint value ) external returns (bool); // Restricted: used internally to Synthetix function burn(address account, uint amount) external; function issue(address account, uint amount) external; } // https://docs.synthetix.io/contracts/source/interfaces/iissuer interface IIssuer { // Views function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid); function availableCurrencyKeys() external view returns (bytes32[] memory); function availableSynthCount() external view returns (uint); function availableSynths(uint index) external view returns (ISynth); function canBurnSynths(address account) external view returns (bool); function collateral(address account) external view returns (uint); function collateralisationRatio(address issuer) external view returns (uint); function collateralisationRatioAndAnyRatesInvalid(address _issuer) external view returns (uint cratio, bool anyRateIsInvalid); function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint debtBalance); function issuanceRatio() external view returns (uint); function lastIssueEvent(address account) external view returns (uint); function maxIssuableSynths(address issuer) external view returns (uint maxIssuable); function minimumStakeTime() external view returns (uint); function remainingIssuableSynths(address issuer) external view returns ( uint maxIssuable, uint alreadyIssued, uint totalSystemDebt ); function synths(bytes32 currencyKey) external view returns (ISynth); function getSynths(bytes32[] calldata currencyKeys) external view returns (ISynth[] memory); function synthsByAddress(address synthAddress) external view returns (bytes32); function totalIssuedSynths(bytes32 currencyKey, bool excludeEtherCollateral) external view returns (uint); function transferableSynthetixAndAnyRateIsInvalid(address account, uint balance) external view returns (uint transferable, bool anyRateIsInvalid); // Restricted: used internally to Synthetix function issueSynths(address from, uint amount) external; function issueSynthsOnBehalf( address issueFor, address from, uint amount ) external; function issueMaxSynths(address from) external; function issueMaxSynthsOnBehalf(address issueFor, address from) external; function burnSynths(address from, uint amount) external; function burnSynthsOnBehalf( address burnForAddress, address from, uint amount ) external; function burnSynthsToTarget(address from) external; function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external; function liquidateDelinquentAccount( address account, uint susdAmount, address liquidator ) external returns (uint totalRedeemed, uint amountToLiquidate); } // Inheritance // Internal references // https://docs.synthetix.io/contracts/source/contracts/addressresolver contract AddressResolver is Owned, IAddressResolver { mapping(bytes32 => address) public repository; constructor(address _owner) public Owned(_owner) {} /* ========== RESTRICTED FUNCTIONS ========== */ function importAddresses(bytes32[] calldata names, address[] calldata destinations) external onlyOwner { require(names.length == destinations.length, "Input lengths must match"); for (uint i = 0; i < names.length; i++) { bytes32 name = names[i]; address destination = destinations[i]; repository[name] = destination; emit AddressImported(name, destination); } } /* ========= PUBLIC FUNCTIONS ========== */ function rebuildCaches(MixinResolver[] calldata destinations) external { for (uint i = 0; i < destinations.length; i++) { destinations[i].rebuildCache(); } } /* ========== VIEWS ========== */ function areAddressesImported(bytes32[] calldata names, address[] calldata destinations) external view returns (bool) { for (uint i = 0; i < names.length; i++) { if (repository[names[i]] != destinations[i]) { return false; } } return true; } function getAddress(bytes32 name) external view returns (address) { return repository[name]; } function requireAndGetAddress(bytes32 name, string calldata reason) external view returns (address) { address _foundAddress = repository[name]; require(_foundAddress != address(0), reason); return _foundAddress; } function getSynth(bytes32 key) external view returns (address) { IIssuer issuer = IIssuer(repository["Issuer"]); require(address(issuer) != address(0), "Cannot find Issuer address"); return address(issuer.synths(key)); } /* ========== EVENTS ========== */ event AddressImported(bytes32 name, address destination); } // solhint-disable payable-fallback // https://docs.synthetix.io/contracts/source/contracts/readproxy contract ReadProxy is Owned { address public target; constructor(address _owner) public Owned(_owner) {} function setTarget(address _target) external onlyOwner { target = _target; emit TargetUpdated(target); } function() external { // The basics of a proxy read call // Note that msg.sender in the underlying will always be the address of this contract. assembly { calldatacopy(0, 0, calldatasize) // Use of staticcall - this will revert if the underlying function mutates state let result := staticcall(gas, sload(target_slot), 0, calldatasize, 0, 0) returndatacopy(0, 0, returndatasize) if iszero(result) { revert(0, returndatasize) } return(0, returndatasize) } } event TargetUpdated(address newTarget); } // Inheritance // Internal references // https://docs.synthetix.io/contracts/source/contracts/mixinresolver contract MixinResolver { AddressResolver public resolver; mapping(bytes32 => address) private addressCache; constructor(address _resolver) internal { resolver = AddressResolver(_resolver); } /* ========== INTERNAL FUNCTIONS ========== */ function combineArrays(bytes32[] memory first, bytes32[] memory second) internal pure returns (bytes32[] memory combination) { combination = new bytes32[](first.length + second.length); for (uint i = 0; i < first.length; i++) { combination[i] = first[i]; } for (uint j = 0; j < second.length; j++) { combination[first.length + j] = second[j]; } } /* ========== PUBLIC FUNCTIONS ========== */ // Note: this function is public not external in order for it to be overridden and invoked via super in subclasses function resolverAddressesRequired() public view returns (bytes32[] memory addresses) {} function rebuildCache() public { bytes32[] memory requiredAddresses = resolverAddressesRequired(); // The resolver must call this function whenver it updates its state for (uint i = 0; i < requiredAddresses.length; i++) { bytes32 name = requiredAddresses[i]; // Note: can only be invoked once the resolver has all the targets needed added address destination = resolver.requireAndGetAddress(name, string(abi.encodePacked("Resolver missing target: ", name))); addressCache[name] = destination; emit CacheUpdated(name, destination); } } /* ========== VIEWS ========== */ function isResolverCached() external view returns (bool) { bytes32[] memory requiredAddresses = resolverAddressesRequired(); for (uint i = 0; i < requiredAddresses.length; i++) { bytes32 name = requiredAddresses[i]; // false if our cache is invalid or if the resolver doesn't have the required address if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) { return false; } } return true; } /* ========== INTERNAL FUNCTIONS ========== */ function requireAndGetAddress(bytes32 name) internal view returns (address) { address _foundAddress = addressCache[name]; require(_foundAddress != address(0), string(abi.encodePacked("Missing address: ", name))); return _foundAddress; } /* ========== EVENTS ========== */ event CacheUpdated(bytes32 name, address destination); } // https://docs.synthetix.io/contracts/source/interfaces/iflexiblestorage interface IFlexibleStorage { // Views function getUIntValue(bytes32 contractName, bytes32 record) external view returns (uint); function getUIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (uint[] memory); function getIntValue(bytes32 contractName, bytes32 record) external view returns (int); function getIntValues(bytes32 contractName, bytes32[] calldata records) external view returns (int[] memory); function getAddressValue(bytes32 contractName, bytes32 record) external view returns (address); function getAddressValues(bytes32 contractName, bytes32[] calldata records) external view returns (address[] memory); function getBoolValue(bytes32 contractName, bytes32 record) external view returns (bool); function getBoolValues(bytes32 contractName, bytes32[] calldata records) external view returns (bool[] memory); function getBytes32Value(bytes32 contractName, bytes32 record) external view returns (bytes32); function getBytes32Values(bytes32 contractName, bytes32[] calldata records) external view returns (bytes32[] memory); // Mutative functions function deleteUIntValue(bytes32 contractName, bytes32 record) external; function deleteIntValue(bytes32 contractName, bytes32 record) external; function deleteAddressValue(bytes32 contractName, bytes32 record) external; function deleteBoolValue(bytes32 contractName, bytes32 record) external; function deleteBytes32Value(bytes32 contractName, bytes32 record) external; function setUIntValue( bytes32 contractName, bytes32 record, uint value ) external; function setUIntValues( bytes32 contractName, bytes32[] calldata records, uint[] calldata values ) external; function setIntValue( bytes32 contractName, bytes32 record, int value ) external; function setIntValues( bytes32 contractName, bytes32[] calldata records, int[] calldata values ) external; function setAddressValue( bytes32 contractName, bytes32 record, address value ) external; function setAddressValues( bytes32 contractName, bytes32[] calldata records, address[] calldata values ) external; function setBoolValue( bytes32 contractName, bytes32 record, bool value ) external; function setBoolValues( bytes32 contractName, bytes32[] calldata records, bool[] calldata values ) external; function setBytes32Value( bytes32 contractName, bytes32 record, bytes32 value ) external; function setBytes32Values( bytes32 contractName, bytes32[] calldata records, bytes32[] calldata values ) external; } // Internal references // https://docs.synthetix.io/contracts/source/contracts/mixinsystemsettings contract MixinSystemSettings is MixinResolver { bytes32 internal constant SETTING_CONTRACT_NAME = "SystemSettings"; bytes32 internal constant SETTING_WAITING_PERIOD_SECS = "waitingPeriodSecs"; bytes32 internal constant SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR = "priceDeviationThresholdFactor"; bytes32 internal constant SETTING_ISSUANCE_RATIO = "issuanceRatio"; bytes32 internal constant SETTING_FEE_PERIOD_DURATION = "feePeriodDuration"; bytes32 internal constant SETTING_TARGET_THRESHOLD = "targetThreshold"; bytes32 internal constant SETTING_LIQUIDATION_DELAY = "liquidationDelay"; bytes32 internal constant SETTING_LIQUIDATION_RATIO = "liquidationRatio"; bytes32 internal constant SETTING_LIQUIDATION_PENALTY = "liquidationPenalty"; bytes32 internal constant SETTING_RATE_STALE_PERIOD = "rateStalePeriod"; bytes32 internal constant SETTING_EXCHANGE_FEE_RATE = "exchangeFeeRate"; bytes32 internal constant SETTING_MINIMUM_STAKE_TIME = "minimumStakeTime"; bytes32 internal constant SETTING_AGGREGATOR_WARNING_FLAGS = "aggregatorWarningFlags"; bytes32 internal constant SETTING_TRADING_REWARDS_ENABLED = "tradingRewardsEnabled"; bytes32 internal constant SETTING_DEBT_SNAPSHOT_STALE_TIME = "debtSnapshotStaleTime"; bytes32 internal constant SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT = "crossDomainDepositGasLimit"; bytes32 internal constant SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT = "crossDomainEscrowGasLimit"; bytes32 internal constant SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT = "crossDomainRewardGasLimit"; bytes32 internal constant SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT = "crossDomainWithdrawalGasLimit"; bytes32 internal constant CONTRACT_FLEXIBLESTORAGE = "FlexibleStorage"; enum CrossDomainMessageGasLimits {Deposit, Escrow, Reward, Withdrawal} constructor(address _resolver) internal MixinResolver(_resolver) {} function resolverAddressesRequired() public view returns (bytes32[] memory addresses) { addresses = new bytes32[](1); addresses[0] = CONTRACT_FLEXIBLESTORAGE; } function flexibleStorage() internal view returns (IFlexibleStorage) { return IFlexibleStorage(requireAndGetAddress(CONTRACT_FLEXIBLESTORAGE)); } function _getGasLimitSetting(CrossDomainMessageGasLimits gasLimitType) internal pure returns (bytes32) { if (gasLimitType == CrossDomainMessageGasLimits.Deposit) { return SETTING_CROSS_DOMAIN_DEPOSIT_GAS_LIMIT; } else if (gasLimitType == CrossDomainMessageGasLimits.Escrow) { return SETTING_CROSS_DOMAIN_ESCROW_GAS_LIMIT; } else if (gasLimitType == CrossDomainMessageGasLimits.Reward) { return SETTING_CROSS_DOMAIN_REWARD_GAS_LIMIT; } else if (gasLimitType == CrossDomainMessageGasLimits.Withdrawal) { return SETTING_CROSS_DOMAIN_WITHDRAWAL_GAS_LIMIT; } else { revert("Unknown gas limit type"); } } function getCrossDomainMessageGasLimit(CrossDomainMessageGasLimits gasLimitType) internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, _getGasLimitSetting(gasLimitType)); } function getTradingRewardsEnabled() internal view returns (bool) { return flexibleStorage().getBoolValue(SETTING_CONTRACT_NAME, SETTING_TRADING_REWARDS_ENABLED); } function getWaitingPeriodSecs() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_WAITING_PERIOD_SECS); } function getPriceDeviationThresholdFactor() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_PRICE_DEVIATION_THRESHOLD_FACTOR); } function getIssuanceRatio() internal view returns (uint) { // lookup on flexible storage directly for gas savings (rather than via SystemSettings) return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_ISSUANCE_RATIO); } function getFeePeriodDuration() internal view returns (uint) { // lookup on flexible storage directly for gas savings (rather than via SystemSettings) return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_FEE_PERIOD_DURATION); } function getTargetThreshold() internal view returns (uint) { // lookup on flexible storage directly for gas savings (rather than via SystemSettings) return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_TARGET_THRESHOLD); } function getLiquidationDelay() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_DELAY); } function getLiquidationRatio() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_RATIO); } function getLiquidationPenalty() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_LIQUIDATION_PENALTY); } function getRateStalePeriod() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_RATE_STALE_PERIOD); } function getExchangeFeeRate(bytes32 currencyKey) internal view returns (uint) { return flexibleStorage().getUIntValue( SETTING_CONTRACT_NAME, keccak256(abi.encodePacked(SETTING_EXCHANGE_FEE_RATE, currencyKey)) ); } function getMinimumStakeTime() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_MINIMUM_STAKE_TIME); } function getAggregatorWarningFlags() internal view returns (address) { return flexibleStorage().getAddressValue(SETTING_CONTRACT_NAME, SETTING_AGGREGATOR_WARNING_FLAGS); } function getDebtSnapshotStaleTime() internal view returns (uint) { return flexibleStorage().getUIntValue(SETTING_CONTRACT_NAME, SETTING_DEBT_SNAPSHOT_STALE_TIME); } } interface IVirtualSynth { // Views function balanceOfUnderlying(address account) external view returns (uint); function rate() external view returns (uint); function readyToSettle() external view returns (bool); function secsLeftInWaitingPeriod() external view returns (uint); function settled() external view returns (bool); function synth() external view returns (ISynth); // Mutative functions function settle(address account) external; } // https://docs.synthetix.io/contracts/source/interfaces/iexchanger interface IExchanger { // Views function calculateAmountAfterSettlement( address from, bytes32 currencyKey, uint amount, uint refunded ) external view returns (uint amountAfterSettlement); function isSynthRateInvalid(bytes32 currencyKey) external view returns (bool); function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) external view returns (uint); function settlementOwing(address account, bytes32 currencyKey) external view returns ( uint reclaimAmount, uint rebateAmount, uint numEntries ); function hasWaitingPeriodOrSettlementOwing(address account, bytes32 currencyKey) external view returns (bool); function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint exchangeFeeRate); function getAmountsForExchange( uint sourceAmount, bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey ) external view returns ( uint amountReceived, uint fee, uint exchangeFeeRate ); function priceDeviationThresholdFactor() external view returns (uint); function waitingPeriodSecs() external view returns (uint); // Mutative functions function exchange( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress ) external returns (uint amountReceived); function exchangeOnBehalf( address exchangeForAddress, address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external returns (uint amountReceived); function exchangeWithTracking( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress, address originator, bytes32 trackingCode ) external returns (uint amountReceived); function exchangeOnBehalfWithTracking( address exchangeForAddress, address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address originator, bytes32 trackingCode ) external returns (uint amountReceived); function exchangeWithVirtual( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress, bytes32 trackingCode ) external returns (uint amountReceived, IVirtualSynth vSynth); function settle(address from, bytes32 currencyKey) external returns ( uint reclaimed, uint refunded, uint numEntries ); function setLastExchangeRateForSynth(bytes32 currencyKey, uint rate) external; function suspendSynthWithInvalidRate(bytes32 currencyKey) external; } /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); 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-solidity/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) { // Solidity only automatically asserts when dividing by 0 require(b > 0, "SafeMath: division by zero"); 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) { require(b != 0, "SafeMath: modulo by zero"); return a % b; } } // Libraries // https://docs.synthetix.io/contracts/source/libraries/safedecimalmath library SafeDecimalMath { using SafeMath for uint; /* Number of decimal places in the representations. */ uint8 public constant decimals = 18; uint8 public constant highPrecisionDecimals = 27; /* The number representing 1.0. */ uint public constant UNIT = 10**uint(decimals); /* The number representing 1.0 for higher fidelity numbers. */ uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals); uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals); /** * @return Provides an interface to UNIT. */ function unit() external pure returns (uint) { return UNIT; } /** * @return Provides an interface to PRECISE_UNIT. */ function preciseUnit() external pure returns (uint) { return PRECISE_UNIT; } /** * @return The result of multiplying x and y, interpreting the operands as fixed-point * decimals. * * @dev A unit factor is divided out after the product of x and y is evaluated, * so that product must be less than 2**256. As this is an integer division, * the internal division always rounds down. This helps save on gas. Rounding * is more expensive on gas. */ function multiplyDecimal(uint x, uint y) internal pure returns (uint) { /* Divide by UNIT to remove the extra factor introduced by the product. */ return x.mul(y) / UNIT; } /** * @return The result of safely multiplying x and y, interpreting the operands * as fixed-point decimals of the specified precision unit. * * @dev The operands should be in the form of a the specified unit factor which will be * divided out after the product of x and y is evaluated, so that product must be * less than 2**256. * * Unlike multiplyDecimal, this function rounds the result to the nearest increment. * Rounding is useful when you need to retain fidelity for small decimal numbers * (eg. small fractions or percentages). */ function _multiplyDecimalRound( uint x, uint y, uint precisionUnit ) private pure returns (uint) { /* Divide by UNIT to remove the extra factor introduced by the product. */ uint quotientTimesTen = x.mul(y) / (precisionUnit / 10); if (quotientTimesTen % 10 >= 5) { quotientTimesTen += 10; } return quotientTimesTen / 10; } /** * @return The result of safely multiplying x and y, interpreting the operands * as fixed-point decimals of a precise unit. * * @dev The operands should be in the precise unit factor which will be * divided out after the product of x and y is evaluated, so that product must be * less than 2**256. * * Unlike multiplyDecimal, this function rounds the result to the nearest increment. * Rounding is useful when you need to retain fidelity for small decimal numbers * (eg. small fractions or percentages). */ function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) { return _multiplyDecimalRound(x, y, PRECISE_UNIT); } /** * @return The result of safely multiplying x and y, interpreting the operands * as fixed-point decimals of a standard unit. * * @dev The operands should be in the standard unit factor which will be * divided out after the product of x and y is evaluated, so that product must be * less than 2**256. * * Unlike multiplyDecimal, this function rounds the result to the nearest increment. * Rounding is useful when you need to retain fidelity for small decimal numbers * (eg. small fractions or percentages). */ function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) { return _multiplyDecimalRound(x, y, UNIT); } /** * @return The result of safely dividing x and y. The return value is a high * precision decimal. * * @dev y is divided after the product of x and the standard precision unit * is evaluated, so the product of x and UNIT must be less than 2**256. As * this is an integer division, the result is always rounded down. * This helps save on gas. Rounding is more expensive on gas. */ function divideDecimal(uint x, uint y) internal pure returns (uint) { /* Reintroduce the UNIT factor that will be divided out by y. */ return x.mul(UNIT).div(y); } /** * @return The result of safely dividing x and y. The return value is as a rounded * decimal in the precision unit specified in the parameter. * * @dev y is divided after the product of x and the specified precision unit * is evaluated, so the product of x and the specified precision unit must * be less than 2**256. The result is rounded to the nearest increment. */ function _divideDecimalRound( uint x, uint y, uint precisionUnit ) private pure returns (uint) { uint resultTimesTen = x.mul(precisionUnit * 10).div(y); if (resultTimesTen % 10 >= 5) { resultTimesTen += 10; } return resultTimesTen / 10; } /** * @return The result of safely dividing x and y. The return value is as a rounded * standard precision decimal. * * @dev y is divided after the product of x and the standard precision unit * is evaluated, so the product of x and the standard precision unit must * be less than 2**256. The result is rounded to the nearest increment. */ function divideDecimalRound(uint x, uint y) internal pure returns (uint) { return _divideDecimalRound(x, y, UNIT); } /** * @return The result of safely dividing x and y. The return value is as a rounded * high precision decimal. * * @dev y is divided after the product of x and the high precision unit * is evaluated, so the product of x and the high precision unit must * be less than 2**256. The result is rounded to the nearest increment. */ function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) { return _divideDecimalRound(x, y, PRECISE_UNIT); } /** * @dev Convert a standard decimal representation to a high precision one. */ function decimalToPreciseDecimal(uint i) internal pure returns (uint) { return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR); } /** * @dev Convert a high precision decimal to a standard decimal representation. */ function preciseDecimalToDecimal(uint i) internal pure returns (uint) { uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10); if (quotientTimesTen % 10 >= 5) { quotientTimesTen += 10; } return quotientTimesTen / 10; } } // https://docs.synthetix.io/contracts/source/interfaces/isystemstatus interface ISystemStatus { struct Status { bool canSuspend; bool canResume; } struct Suspension { bool suspended; // reason is an integer code, // 0 => no reason, 1 => upgrading, 2+ => defined by system usage uint248 reason; } // Views function accessControl(bytes32 section, address account) external view returns (bool canSuspend, bool canResume); function requireSystemActive() external view; function requireIssuanceActive() external view; function requireExchangeActive() external view; function requireExchangeBetweenSynthsAllowed(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view; function requireSynthActive(bytes32 currencyKey) external view; function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view; function systemSuspension() external view returns (bool suspended, uint248 reason); function issuanceSuspension() external view returns (bool suspended, uint248 reason); function exchangeSuspension() external view returns (bool suspended, uint248 reason); function synthExchangeSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason); function synthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason); function getSynthExchangeSuspensions(bytes32[] calldata synths) external view returns (bool[] memory exchangeSuspensions, uint256[] memory reasons); function getSynthSuspensions(bytes32[] calldata synths) external view returns (bool[] memory suspensions, uint256[] memory reasons); // Restricted functions function suspendSynth(bytes32 currencyKey, uint256 reason) external; function updateAccessControl( bytes32 section, address account, bool canSuspend, bool canResume ) external; } // https://docs.synthetix.io/contracts/source/interfaces/iexchangestate interface IExchangeState { // Views struct ExchangeEntry { bytes32 src; uint amount; bytes32 dest; uint amountReceived; uint exchangeFeeRate; uint timestamp; uint roundIdForSrc; uint roundIdForDest; } function getLengthOfEntries(address account, bytes32 currencyKey) external view returns (uint); function getEntryAt( address account, bytes32 currencyKey, uint index ) external view returns ( bytes32 src, uint amount, bytes32 dest, uint amountReceived, uint exchangeFeeRate, uint timestamp, uint roundIdForSrc, uint roundIdForDest ); function getMaxTimestamp(address account, bytes32 currencyKey) external view returns (uint); // Mutative functions function appendExchangeEntry( address account, bytes32 src, uint amount, bytes32 dest, uint amountReceived, uint exchangeFeeRate, uint timestamp, uint roundIdForSrc, uint roundIdForDest ) external; function removeEntries(address account, bytes32 currencyKey) external; } // https://docs.synthetix.io/contracts/source/interfaces/iexchangerates interface IExchangeRates { // Structs struct RateAndUpdatedTime { uint216 rate; uint40 time; } struct InversePricing { uint entryPoint; uint upperLimit; uint lowerLimit; bool frozenAtUpperLimit; bool frozenAtLowerLimit; } // Views function aggregators(bytes32 currencyKey) external view returns (address); function aggregatorWarningFlags() external view returns (address); function anyRateIsInvalid(bytes32[] calldata currencyKeys) external view returns (bool); function canFreezeRate(bytes32 currencyKey) external view returns (bool); function currentRoundForRate(bytes32 currencyKey) external view returns (uint); function currenciesUsingAggregator(address aggregator) external view returns (bytes32[] memory); function effectiveValue( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external view returns (uint value); function effectiveValueAndRates( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external view returns ( uint value, uint sourceRate, uint destinationRate ); function effectiveValueAtRound( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, uint roundIdForSrc, uint roundIdForDest ) external view returns (uint value); function getCurrentRoundId(bytes32 currencyKey) external view returns (uint); function getLastRoundIdBeforeElapsedSecs( bytes32 currencyKey, uint startingRoundId, uint startingTimestamp, uint timediff ) external view returns (uint); function inversePricing(bytes32 currencyKey) external view returns ( uint entryPoint, uint upperLimit, uint lowerLimit, bool frozenAtUpperLimit, bool frozenAtLowerLimit ); function lastRateUpdateTimes(bytes32 currencyKey) external view returns (uint256); function oracle() external view returns (address); function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time); function rateAndUpdatedTime(bytes32 currencyKey) external view returns (uint rate, uint time); function rateAndInvalid(bytes32 currencyKey) external view returns (uint rate, bool isInvalid); function rateForCurrency(bytes32 currencyKey) external view returns (uint); function rateIsFlagged(bytes32 currencyKey) external view returns (bool); function rateIsFrozen(bytes32 currencyKey) external view returns (bool); function rateIsInvalid(bytes32 currencyKey) external view returns (bool); function rateIsStale(bytes32 currencyKey) external view returns (bool); function rateStalePeriod() external view returns (uint); function ratesAndUpdatedTimeForCurrencyLastNRounds(bytes32 currencyKey, uint numRounds) external view returns (uint[] memory rates, uint[] memory times); function ratesAndInvalidForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory rates, bool anyRateInvalid); function ratesForCurrencies(bytes32[] calldata currencyKeys) external view returns (uint[] memory); // Mutative functions function freezeRate(bytes32 currencyKey) external; } // https://docs.synthetix.io/contracts/source/interfaces/isynthetix interface ISynthetix { // Views function anySynthOrSNXRateIsInvalid() external view returns (bool anyRateInvalid); function availableCurrencyKeys() external view returns (bytes32[] memory); function availableSynthCount() external view returns (uint); function availableSynths(uint index) external view returns (ISynth); function collateral(address account) external view returns (uint); function collateralisationRatio(address issuer) external view returns (uint); function debtBalanceOf(address issuer, bytes32 currencyKey) external view returns (uint); function isWaitingPeriod(bytes32 currencyKey) external view returns (bool); function maxIssuableSynths(address issuer) external view returns (uint maxIssuable); function remainingIssuableSynths(address issuer) external view returns ( uint maxIssuable, uint alreadyIssued, uint totalSystemDebt ); function synths(bytes32 currencyKey) external view returns (ISynth); function synthsByAddress(address synthAddress) external view returns (bytes32); function totalIssuedSynths(bytes32 currencyKey) external view returns (uint); function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) external view returns (uint); function transferableSynthetix(address account) external view returns (uint transferable); // Mutative Functions function burnSynths(uint amount) external; function burnSynthsOnBehalf(address burnForAddress, uint amount) external; function burnSynthsToTarget() external; function burnSynthsToTargetOnBehalf(address burnForAddress) external; function exchange( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external returns (uint amountReceived); function exchangeOnBehalf( address exchangeForAddress, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external returns (uint amountReceived); function exchangeWithTracking( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address originator, bytes32 trackingCode ) external returns (uint amountReceived); function exchangeOnBehalfWithTracking( address exchangeForAddress, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address originator, bytes32 trackingCode ) external returns (uint amountReceived); function exchangeWithVirtual( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, bytes32 trackingCode ) external returns (uint amountReceived, IVirtualSynth vSynth); function issueMaxSynths() external; function issueMaxSynthsOnBehalf(address issueForAddress) external; function issueSynths(uint amount) external; function issueSynthsOnBehalf(address issueForAddress, uint amount) external; function mint() external returns (bool); function settle(bytes32 currencyKey) external returns ( uint reclaimed, uint refunded, uint numEntries ); // Liquidations function liquidateDelinquentAccount(address account, uint susdAmount) external returns (bool); // Restricted Functions function mintSecondary(address account, uint amount) external; function mintSecondaryRewards(uint amount) external; function burnSecondary(address account, uint amount) external; } // https://docs.synthetix.io/contracts/source/interfaces/ifeepool interface IFeePool { // Views // solhint-disable-next-line func-name-mixedcase function FEE_ADDRESS() external view returns (address); function feesAvailable(address account) external view returns (uint, uint); function feePeriodDuration() external view returns (uint); function isFeesClaimable(address account) external view returns (bool); function targetThreshold() external view returns (uint); function totalFeesAvailable() external view returns (uint); function totalRewardsAvailable() external view returns (uint); // Mutative Functions function claimFees() external returns (bool); function claimOnBehalf(address claimingForAddress) external returns (bool); function closeCurrentFeePeriod() external; // Restricted: used internally to Synthetix function appendAccountIssuanceRecord( address account, uint lockedAmount, uint debtEntryIndex ) external; function recordFeePaid(uint sUSDAmount) external; function setRewardsToDistribute(uint amount) external; } // https://docs.synthetix.io/contracts/source/interfaces/idelegateapprovals interface IDelegateApprovals { // Views function canBurnFor(address authoriser, address delegate) external view returns (bool); function canIssueFor(address authoriser, address delegate) external view returns (bool); function canClaimFor(address authoriser, address delegate) external view returns (bool); function canExchangeFor(address authoriser, address delegate) external view returns (bool); // Mutative function approveAllDelegatePowers(address delegate) external; function removeAllDelegatePowers(address delegate) external; function approveBurnOnBehalf(address delegate) external; function removeBurnOnBehalf(address delegate) external; function approveIssueOnBehalf(address delegate) external; function removeIssueOnBehalf(address delegate) external; function approveClaimOnBehalf(address delegate) external; function removeClaimOnBehalf(address delegate) external; function approveExchangeOnBehalf(address delegate) external; function removeExchangeOnBehalf(address delegate) external; } // https://docs.synthetix.io/contracts/source/interfaces/itradingrewards interface ITradingRewards { /* ========== VIEWS ========== */ function getAvailableRewards() external view returns (uint); function getUnassignedRewards() external view returns (uint); function getRewardsToken() external view returns (address); function getPeriodController() external view returns (address); function getCurrentPeriod() external view returns (uint); function getPeriodIsClaimable(uint periodID) external view returns (bool); function getPeriodIsFinalized(uint periodID) external view returns (bool); function getPeriodRecordedFees(uint periodID) external view returns (uint); function getPeriodTotalRewards(uint periodID) external view returns (uint); function getPeriodAvailableRewards(uint periodID) external view returns (uint); function getUnaccountedFeesForAccountForPeriod(address account, uint periodID) external view returns (uint); function getAvailableRewardsForAccountForPeriod(address account, uint periodID) external view returns (uint); function getAvailableRewardsForAccountForPeriods(address account, uint[] calldata periodIDs) external view returns (uint totalRewards); /* ========== MUTATIVE FUNCTIONS ========== */ function claimRewardsForPeriod(uint periodID) external; function claimRewardsForPeriods(uint[] calldata periodIDs) external; /* ========== RESTRICTED FUNCTIONS ========== */ function recordExchangeFeeForAccount(uint usdFeeAmount, address account) external; function closeCurrentPeriodWithRewards(uint rewards) external; function recoverTokens(address tokenAddress, address recoverAddress) external; function recoverUnassignedRewardTokens(address recoverAddress) external; function recoverAssignedRewardTokensAndDestroyPeriod(address recoverAddress, uint periodID) external; function setPeriodController(address newPeriodController) external; } // Inheritance // Internal references // https://docs.synthetix.io/contracts/source/contracts/proxy contract Proxy is Owned { Proxyable public target; constructor(address _owner) public Owned(_owner) {} function setTarget(Proxyable _target) external onlyOwner { target = _target; emit TargetUpdated(_target); } function _emit( bytes calldata callData, uint numTopics, bytes32 topic1, bytes32 topic2, bytes32 topic3, bytes32 topic4 ) external onlyTarget { uint size = callData.length; bytes memory _callData = callData; assembly { /* The first 32 bytes of callData contain its length (as specified by the abi). * Length is assumed to be a uint256 and therefore maximum of 32 bytes * in length. It is also leftpadded to be a multiple of 32 bytes. * This means moving call_data across 32 bytes guarantees we correctly access * the data itself. */ switch numTopics case 0 { log0(add(_callData, 32), size) } case 1 { log1(add(_callData, 32), size, topic1) } case 2 { log2(add(_callData, 32), size, topic1, topic2) } case 3 { log3(add(_callData, 32), size, topic1, topic2, topic3) } case 4 { log4(add(_callData, 32), size, topic1, topic2, topic3, topic4) } } } // solhint-disable no-complex-fallback function() external payable { // Mutable call setting Proxyable.messageSender as this is using call not delegatecall target.setMessageSender(msg.sender); assembly { let free_ptr := mload(0x40) calldatacopy(free_ptr, 0, calldatasize) /* We must explicitly forward ether to the underlying contract as well. */ let result := call(gas, sload(target_slot), callvalue, free_ptr, calldatasize, 0, 0) returndatacopy(free_ptr, 0, returndatasize) if iszero(result) { revert(free_ptr, returndatasize) } return(free_ptr, returndatasize) } } modifier onlyTarget { require(Proxyable(msg.sender) == target, "Must be proxy target"); _; } event TargetUpdated(Proxyable newTarget); } // Inheritance // Internal references // https://docs.synthetix.io/contracts/source/contracts/proxyable contract Proxyable is Owned { // This contract should be treated like an abstract contract /* The proxy this contract exists behind. */ Proxy public proxy; Proxy public integrationProxy; /* The caller of the proxy, passed through to this contract. * Note that every function using this member must apply the onlyProxy or * optionalProxy modifiers, otherwise their invocations can use stale values. */ address public messageSender; constructor(address payable _proxy) internal { // This contract is abstract, and thus cannot be instantiated directly require(owner != address(0), "Owner must be set"); proxy = Proxy(_proxy); emit ProxyUpdated(_proxy); } function setProxy(address payable _proxy) external onlyOwner { proxy = Proxy(_proxy); emit ProxyUpdated(_proxy); } function setIntegrationProxy(address payable _integrationProxy) external onlyOwner { integrationProxy = Proxy(_integrationProxy); } function setMessageSender(address sender) external onlyProxy { messageSender = sender; } modifier onlyProxy { _onlyProxy(); _; } function _onlyProxy() private view { require(Proxy(msg.sender) == proxy || Proxy(msg.sender) == integrationProxy, "Only the proxy can call"); } modifier optionalProxy { _optionalProxy(); _; } function _optionalProxy() private { if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) { messageSender = msg.sender; } } modifier optionalProxy_onlyOwner { _optionalProxy_onlyOwner(); _; } // solhint-disable-next-line func-name-mixedcase function _optionalProxy_onlyOwner() private { if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) { messageSender = msg.sender; } require(messageSender == owner, "Owner only function"); } event ProxyUpdated(address proxyAddress); } /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see `ERC20Detailed`. */ 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. * * > 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); } // Inheritance // Libraries // Internal references // Note: use OZ's IERC20 here as using ours will complain about conflicting names // during the build (VirtualSynth has IERC20 from the OZ ERC20 implementation) // Used to have strongly-typed access to internal mutative functions in Synthetix interface ISynthetixInternal { function emitExchangeTracking( bytes32 trackingCode, bytes32 toCurrencyKey, uint256 toAmount ) external; function emitSynthExchange( address account, bytes32 fromCurrencyKey, uint fromAmount, bytes32 toCurrencyKey, uint toAmount, address toAddress ) external; function emitExchangeReclaim( address account, bytes32 currencyKey, uint amount ) external; function emitExchangeRebate( address account, bytes32 currencyKey, uint amount ) external; } interface IExchangerInternalDebtCache { function updateCachedSynthDebtsWithRates(bytes32[] calldata currencyKeys, uint[] calldata currencyRates) external; function updateCachedSynthDebts(bytes32[] calldata currencyKeys) external; } // https://docs.synthetix.io/contracts/source/contracts/exchanger contract Exchanger is Owned, MixinSystemSettings, IExchanger { using SafeMath for uint; using SafeDecimalMath for uint; struct ExchangeEntrySettlement { bytes32 src; uint amount; bytes32 dest; uint reclaim; uint rebate; uint srcRoundIdAtPeriodEnd; uint destRoundIdAtPeriodEnd; uint timestamp; } bytes32 private constant sUSD = "sUSD"; // SIP-65: Decentralized circuit breaker uint public constant CIRCUIT_BREAKER_SUSPENSION_REASON = 65; mapping(bytes32 => uint) public lastExchangeRate; /* ========== ADDRESS RESOLVER CONFIGURATION ========== */ bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus"; bytes32 private constant CONTRACT_EXCHANGESTATE = "ExchangeState"; bytes32 private constant CONTRACT_EXRATES = "ExchangeRates"; bytes32 private constant CONTRACT_SYNTHETIX = "Synthetix"; bytes32 private constant CONTRACT_FEEPOOL = "FeePool"; bytes32 private constant CONTRACT_TRADING_REWARDS = "TradingRewards"; bytes32 private constant CONTRACT_DELEGATEAPPROVALS = "DelegateApprovals"; bytes32 private constant CONTRACT_ISSUER = "Issuer"; bytes32 private constant CONTRACT_DEBTCACHE = "DebtCache"; constructor(address _owner, address _resolver) public Owned(_owner) MixinSystemSettings(_resolver) {} /* ========== VIEWS ========== */ function resolverAddressesRequired() public view returns (bytes32[] memory addresses) { bytes32[] memory existingAddresses = MixinSystemSettings.resolverAddressesRequired(); bytes32[] memory newAddresses = new bytes32[](9); newAddresses[0] = CONTRACT_SYSTEMSTATUS; newAddresses[1] = CONTRACT_EXCHANGESTATE; newAddresses[2] = CONTRACT_EXRATES; newAddresses[3] = CONTRACT_SYNTHETIX; newAddresses[4] = CONTRACT_FEEPOOL; newAddresses[5] = CONTRACT_TRADING_REWARDS; newAddresses[6] = CONTRACT_DELEGATEAPPROVALS; newAddresses[7] = CONTRACT_ISSUER; newAddresses[8] = CONTRACT_DEBTCACHE; addresses = combineArrays(existingAddresses, newAddresses); } function systemStatus() internal view returns (ISystemStatus) { return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS)); } function exchangeState() internal view returns (IExchangeState) { return IExchangeState(requireAndGetAddress(CONTRACT_EXCHANGESTATE)); } function exchangeRates() internal view returns (IExchangeRates) { return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES)); } function synthetix() internal view returns (ISynthetix) { return ISynthetix(requireAndGetAddress(CONTRACT_SYNTHETIX)); } function feePool() internal view returns (IFeePool) { return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL)); } function tradingRewards() internal view returns (ITradingRewards) { return ITradingRewards(requireAndGetAddress(CONTRACT_TRADING_REWARDS)); } function delegateApprovals() internal view returns (IDelegateApprovals) { return IDelegateApprovals(requireAndGetAddress(CONTRACT_DELEGATEAPPROVALS)); } function issuer() internal view returns (IIssuer) { return IIssuer(requireAndGetAddress(CONTRACT_ISSUER)); } function debtCache() internal view returns (IExchangerInternalDebtCache) { return IExchangerInternalDebtCache(requireAndGetAddress(CONTRACT_DEBTCACHE)); } function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) public view returns (uint) { return secsLeftInWaitingPeriodForExchange(exchangeState().getMaxTimestamp(account, currencyKey)); } function waitingPeriodSecs() external view returns (uint) { return getWaitingPeriodSecs(); } function tradingRewardsEnabled() external view returns (bool) { return getTradingRewardsEnabled(); } function priceDeviationThresholdFactor() external view returns (uint) { return getPriceDeviationThresholdFactor(); } function settlementOwing(address account, bytes32 currencyKey) public view returns ( uint reclaimAmount, uint rebateAmount, uint numEntries ) { (reclaimAmount, rebateAmount, numEntries, ) = _settlementOwing(account, currencyKey); } // Internal function to emit events for each individual rebate and reclaim entry function _settlementOwing(address account, bytes32 currencyKey) internal view returns ( uint reclaimAmount, uint rebateAmount, uint numEntries, ExchangeEntrySettlement[] memory ) { // Need to sum up all reclaim and rebate amounts for the user and the currency key numEntries = exchangeState().getLengthOfEntries(account, currencyKey); // For each unsettled exchange ExchangeEntrySettlement[] memory settlements = new ExchangeEntrySettlement[](numEntries); for (uint i = 0; i < numEntries; i++) { uint reclaim; uint rebate; // fetch the entry from storage IExchangeState.ExchangeEntry memory exchangeEntry = _getExchangeEntry(account, currencyKey, i); // determine the last round ids for src and dest pairs when period ended or latest if not over (uint srcRoundIdAtPeriodEnd, uint destRoundIdAtPeriodEnd) = getRoundIdsAtPeriodEnd(exchangeEntry); // given these round ids, determine what effective value they should have received uint destinationAmount = exchangeRates().effectiveValueAtRound( exchangeEntry.src, exchangeEntry.amount, exchangeEntry.dest, srcRoundIdAtPeriodEnd, destRoundIdAtPeriodEnd ); // and deduct the fee from this amount using the exchangeFeeRate from storage uint amountShouldHaveReceived = _getAmountReceivedForExchange(destinationAmount, exchangeEntry.exchangeFeeRate); // SIP-65 settlements where the amount at end of waiting period is beyond the threshold, then // settle with no reclaim or rebate if (!_isDeviationAboveThreshold(exchangeEntry.amountReceived, amountShouldHaveReceived)) { if (exchangeEntry.amountReceived > amountShouldHaveReceived) { // if they received more than they should have, add to the reclaim tally reclaim = exchangeEntry.amountReceived.sub(amountShouldHaveReceived); reclaimAmount = reclaimAmount.add(reclaim); } else if (amountShouldHaveReceived > exchangeEntry.amountReceived) { // if less, add to the rebate tally rebate = amountShouldHaveReceived.sub(exchangeEntry.amountReceived); rebateAmount = rebateAmount.add(rebate); } } settlements[i] = ExchangeEntrySettlement({ src: exchangeEntry.src, amount: exchangeEntry.amount, dest: exchangeEntry.dest, reclaim: reclaim, rebate: rebate, srcRoundIdAtPeriodEnd: srcRoundIdAtPeriodEnd, destRoundIdAtPeriodEnd: destRoundIdAtPeriodEnd, timestamp: exchangeEntry.timestamp }); } return (reclaimAmount, rebateAmount, numEntries, settlements); } function _getExchangeEntry( address account, bytes32 currencyKey, uint index ) internal view returns (IExchangeState.ExchangeEntry memory) { ( bytes32 src, uint amount, bytes32 dest, uint amountReceived, uint exchangeFeeRate, uint timestamp, uint roundIdForSrc, uint roundIdForDest ) = exchangeState().getEntryAt(account, currencyKey, index); return IExchangeState.ExchangeEntry({ src: src, amount: amount, dest: dest, amountReceived: amountReceived, exchangeFeeRate: exchangeFeeRate, timestamp: timestamp, roundIdForSrc: roundIdForSrc, roundIdForDest: roundIdForDest }); } function hasWaitingPeriodOrSettlementOwing(address account, bytes32 currencyKey) external view returns (bool) { if (maxSecsLeftInWaitingPeriod(account, currencyKey) != 0) { return true; } (uint reclaimAmount, , , ) = _settlementOwing(account, currencyKey); return reclaimAmount > 0; } /* ========== SETTERS ========== */ function calculateAmountAfterSettlement( address from, bytes32 currencyKey, uint amount, uint refunded ) public view returns (uint amountAfterSettlement) { amountAfterSettlement = amount; // balance of a synth will show an amount after settlement uint balanceOfSourceAfterSettlement = IERC20(address(issuer().synths(currencyKey))).balanceOf(from); // when there isn't enough supply (either due to reclamation settlement or because the number is too high) if (amountAfterSettlement > balanceOfSourceAfterSettlement) { // then the amount to exchange is reduced to their remaining supply amountAfterSettlement = balanceOfSourceAfterSettlement; } if (refunded > 0) { amountAfterSettlement = amountAfterSettlement.add(refunded); } } function isSynthRateInvalid(bytes32 currencyKey) external view returns (bool) { return _isSynthRateInvalid(currencyKey, exchangeRates().rateForCurrency(currencyKey)); } /* ========== MUTATIVE FUNCTIONS ========== */ function exchange( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress ) external onlySynthetixorSynth returns (uint amountReceived) { uint fee; (amountReceived, fee, ) = _exchange( from, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, destinationAddress, false ); _processTradingRewards(fee, destinationAddress); } function exchangeOnBehalf( address exchangeForAddress, address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) external onlySynthetixorSynth returns (uint amountReceived) { require(delegateApprovals().canExchangeFor(exchangeForAddress, from), "Not approved to act on behalf"); uint fee; (amountReceived, fee, ) = _exchange( exchangeForAddress, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, exchangeForAddress, false ); _processTradingRewards(fee, exchangeForAddress); } function exchangeWithTracking( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress, address originator, bytes32 trackingCode ) external onlySynthetixorSynth returns (uint amountReceived) { uint fee; (amountReceived, fee, ) = _exchange( from, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, destinationAddress, false ); _processTradingRewards(fee, originator); _emitTrackingEvent(trackingCode, destinationCurrencyKey, amountReceived); } function exchangeOnBehalfWithTracking( address exchangeForAddress, address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address originator, bytes32 trackingCode ) external onlySynthetixorSynth returns (uint amountReceived) { require(delegateApprovals().canExchangeFor(exchangeForAddress, from), "Not approved to act on behalf"); uint fee; (amountReceived, fee, ) = _exchange( exchangeForAddress, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, exchangeForAddress, false ); _processTradingRewards(fee, originator); _emitTrackingEvent(trackingCode, destinationCurrencyKey, amountReceived); } function exchangeWithVirtual( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress, bytes32 trackingCode ) external onlySynthetixorSynth returns (uint amountReceived, IVirtualSynth vSynth) { uint fee; (amountReceived, fee, vSynth) = _exchange( from, sourceCurrencyKey, sourceAmount, destinationCurrencyKey, destinationAddress, true ); _processTradingRewards(fee, destinationAddress); if (trackingCode != bytes32(0)) { _emitTrackingEvent(trackingCode, destinationCurrencyKey, amountReceived); } } function _emitTrackingEvent( bytes32 trackingCode, bytes32 toCurrencyKey, uint256 toAmount ) internal { ISynthetixInternal(address(synthetix())).emitExchangeTracking(trackingCode, toCurrencyKey, toAmount); } function _processTradingRewards(uint fee, address originator) internal { if (fee > 0 && originator != address(0) && getTradingRewardsEnabled()) { tradingRewards().recordExchangeFeeForAccount(fee, originator); } } function _suspendIfRateInvalid(bytes32 currencyKey, uint rate) internal returns (bool circuitBroken) { if (_isSynthRateInvalid(currencyKey, rate)) { systemStatus().suspendSynth(currencyKey, CIRCUIT_BREAKER_SUSPENSION_REASON); circuitBroken = true; } else { lastExchangeRate[currencyKey] = rate; } } function _updateSNXIssuedDebtOnExchange(bytes32[2] memory currencyKeys, uint[2] memory currencyRates) internal { bool includesSUSD = currencyKeys[0] == sUSD || currencyKeys[1] == sUSD; uint numKeys = includesSUSD ? 2 : 3; bytes32[] memory keys = new bytes32[](numKeys); keys[0] = currencyKeys[0]; keys[1] = currencyKeys[1]; uint[] memory rates = new uint[](numKeys); rates[0] = currencyRates[0]; rates[1] = currencyRates[1]; if (!includesSUSD) { keys[2] = sUSD; // And we'll also update sUSD to account for any fees if it wasn't one of the exchanged currencies rates[2] = SafeDecimalMath.unit(); } // Note that exchanges can't invalidate the debt cache, since if a rate is invalid, // the exchange will have failed already. debtCache().updateCachedSynthDebtsWithRates(keys, rates); } function _settleAndCalcSourceAmountRemaining( uint sourceAmount, address from, bytes32 sourceCurrencyKey ) internal returns (uint sourceAmountAfterSettlement) { (, uint refunded, uint numEntriesSettled) = _internalSettle(from, sourceCurrencyKey, false); sourceAmountAfterSettlement = sourceAmount; // when settlement was required if (numEntriesSettled > 0) { // ensure the sourceAmount takes this into account sourceAmountAfterSettlement = calculateAmountAfterSettlement(from, sourceCurrencyKey, sourceAmount, refunded); } } function _exchange( address from, bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey, address destinationAddress, bool virtualSynth ) internal returns ( uint amountReceived, uint fee, IVirtualSynth vSynth ) { _ensureCanExchange(sourceCurrencyKey, sourceAmount, destinationCurrencyKey); uint sourceAmountAfterSettlement = _settleAndCalcSourceAmountRemaining(sourceAmount, from, sourceCurrencyKey); // If, after settlement the user has no balance left (highly unlikely), then return to prevent // emitting events of 0 and don't revert so as to ensure the settlement queue is emptied if (sourceAmountAfterSettlement == 0) { return (0, 0, IVirtualSynth(0)); } uint exchangeFeeRate; uint sourceRate; uint destinationRate; // Note: `fee` is denominated in the destinationCurrencyKey. (amountReceived, fee, exchangeFeeRate, sourceRate, destinationRate) = _getAmountsForExchangeMinusFees( sourceAmountAfterSettlement, sourceCurrencyKey, destinationCurrencyKey ); // SIP-65: Decentralized Circuit Breaker if ( _suspendIfRateInvalid(sourceCurrencyKey, sourceRate) || _suspendIfRateInvalid(destinationCurrencyKey, destinationRate) ) { return (0, 0, IVirtualSynth(0)); } // Note: We don't need to check their balance as the burn() below will do a safe subtraction which requires // the subtraction to not overflow, which would happen if their balance is not sufficient. vSynth = _convert( sourceCurrencyKey, from, sourceAmountAfterSettlement, destinationCurrencyKey, amountReceived, destinationAddress, virtualSynth ); // When using a virtual synth, it becomes the destinationAddress for event and settlement tracking if (vSynth != IVirtualSynth(0)) { destinationAddress = address(vSynth); } // Remit the fee if required if (fee > 0) { // Normalize fee to sUSD // Note: `fee` is being reused to avoid stack too deep errors. fee = exchangeRates().effectiveValue(destinationCurrencyKey, fee, sUSD); // Remit the fee in sUSDs issuer().synths(sUSD).issue(feePool().FEE_ADDRESS(), fee); // Tell the fee pool about this feePool().recordFeePaid(fee); } // Note: As of this point, `fee` is denominated in sUSD. // Nothing changes as far as issuance data goes because the total value in the system hasn't changed. // But we will update the debt snapshot in case exchange rates have fluctuated since the last exchange // in these currencies _updateSNXIssuedDebtOnExchange([sourceCurrencyKey, destinationCurrencyKey], [sourceRate, destinationRate]); // Let the DApps know there was a Synth exchange ISynthetixInternal(address(synthetix())).emitSynthExchange( from, sourceCurrencyKey, sourceAmountAfterSettlement, destinationCurrencyKey, amountReceived, destinationAddress ); // iff the waiting period is gt 0 if (getWaitingPeriodSecs() > 0) { // persist the exchange information for the dest key appendExchange( destinationAddress, sourceCurrencyKey, sourceAmountAfterSettlement, destinationCurrencyKey, amountReceived, exchangeFeeRate ); } } function _convert( bytes32 sourceCurrencyKey, address from, uint sourceAmountAfterSettlement, bytes32 destinationCurrencyKey, uint amountReceived, address recipient, bool virtualSynth ) internal returns (IVirtualSynth vSynth) { // Burn the source amount issuer().synths(sourceCurrencyKey).burn(from, sourceAmountAfterSettlement); // Issue their new synths ISynth dest = issuer().synths(destinationCurrencyKey); if (virtualSynth) { Proxyable synth = Proxyable(address(dest)); vSynth = _createVirtualSynth(IERC20(address(synth.proxy())), recipient, amountReceived, destinationCurrencyKey); dest.issue(address(vSynth), amountReceived); } else { dest.issue(recipient, amountReceived); } } function _createVirtualSynth( IERC20, address, uint, bytes32 ) internal returns (IVirtualSynth) { revert("Cannot be run on this layer"); } // Note: this function can intentionally be called by anyone on behalf of anyone else (the caller just pays the gas) function settle(address from, bytes32 currencyKey) external returns ( uint reclaimed, uint refunded, uint numEntriesSettled ) { systemStatus().requireSynthActive(currencyKey); return _internalSettle(from, currencyKey, true); } function suspendSynthWithInvalidRate(bytes32 currencyKey) external { systemStatus().requireSystemActive(); require(issuer().synths(currencyKey) != ISynth(0), "No such synth"); require(_isSynthRateInvalid(currencyKey, exchangeRates().rateForCurrency(currencyKey)), "Synth price is valid"); systemStatus().suspendSynth(currencyKey, CIRCUIT_BREAKER_SUSPENSION_REASON); } // SIP-78 function setLastExchangeRateForSynth(bytes32 currencyKey, uint rate) external onlyExchangeRates { require(rate > 0, "Rate must be above 0"); lastExchangeRate[currencyKey] = rate; } /* ========== INTERNAL FUNCTIONS ========== */ function _ensureCanExchange( bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey ) internal view { require(sourceCurrencyKey != destinationCurrencyKey, "Can't be same synth"); require(sourceAmount > 0, "Zero amount"); bytes32[] memory synthKeys = new bytes32[](2); synthKeys[0] = sourceCurrencyKey; synthKeys[1] = destinationCurrencyKey; require(!exchangeRates().anyRateIsInvalid(synthKeys), "Src/dest rate invalid or not found"); } function _isSynthRateInvalid(bytes32 currencyKey, uint currentRate) internal view returns (bool) { if (currentRate == 0) { return true; } uint lastRateFromExchange = lastExchangeRate[currencyKey]; if (lastRateFromExchange > 0) { return _isDeviationAboveThreshold(lastRateFromExchange, currentRate); } // if no last exchange for this synth, then we need to look up last 3 rates (+1 for current rate) (uint[] memory rates, ) = exchangeRates().ratesAndUpdatedTimeForCurrencyLastNRounds(currencyKey, 4); // start at index 1 to ignore current rate for (uint i = 1; i < rates.length; i++) { // ignore any empty rates in the past (otherwise we will never be able to get validity) if (rates[i] > 0 && _isDeviationAboveThreshold(rates[i], currentRate)) { return true; } } return false; } function _isDeviationAboveThreshold(uint base, uint comparison) internal view returns (bool) { if (base == 0 || comparison == 0) { return true; } uint factor; if (comparison > base) { factor = comparison.divideDecimal(base); } else { factor = base.divideDecimal(comparison); } return factor >= getPriceDeviationThresholdFactor(); } function _internalSettle( address from, bytes32 currencyKey, bool updateCache ) internal returns ( uint reclaimed, uint refunded, uint numEntriesSettled ) { require(maxSecsLeftInWaitingPeriod(from, currencyKey) == 0, "Cannot settle during waiting period"); (uint reclaimAmount, uint rebateAmount, uint entries, ExchangeEntrySettlement[] memory settlements) = _settlementOwing(from, currencyKey); if (reclaimAmount > rebateAmount) { reclaimed = reclaimAmount.sub(rebateAmount); reclaim(from, currencyKey, reclaimed); } else if (rebateAmount > reclaimAmount) { refunded = rebateAmount.sub(reclaimAmount); refund(from, currencyKey, refunded); } if (updateCache) { bytes32[] memory key = new bytes32[](1); key[0] = currencyKey; debtCache().updateCachedSynthDebts(key); } // emit settlement event for each settled exchange entry for (uint i = 0; i < settlements.length; i++) { emit ExchangeEntrySettled( from, settlements[i].src, settlements[i].amount, settlements[i].dest, settlements[i].reclaim, settlements[i].rebate, settlements[i].srcRoundIdAtPeriodEnd, settlements[i].destRoundIdAtPeriodEnd, settlements[i].timestamp ); } numEntriesSettled = entries; // Now remove all entries, even if no reclaim and no rebate exchangeState().removeEntries(from, currencyKey); } function reclaim( address from, bytes32 currencyKey, uint amount ) internal { // burn amount from user issuer().synths(currencyKey).burn(from, amount); ISynthetixInternal(address(synthetix())).emitExchangeReclaim(from, currencyKey, amount); } function refund( address from, bytes32 currencyKey, uint amount ) internal { // issue amount to user issuer().synths(currencyKey).issue(from, amount); ISynthetixInternal(address(synthetix())).emitExchangeRebate(from, currencyKey, amount); } function secsLeftInWaitingPeriodForExchange(uint timestamp) internal view returns (uint) { uint _waitingPeriodSecs = getWaitingPeriodSecs(); if (timestamp == 0 || now >= timestamp.add(_waitingPeriodSecs)) { return 0; } return timestamp.add(_waitingPeriodSecs).sub(now); } function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint exchangeFeeRate) { exchangeFeeRate = _feeRateForExchange(sourceCurrencyKey, destinationCurrencyKey); } function _feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) internal view returns (uint exchangeFeeRate) { // Get the exchange fee rate as per destination currencyKey exchangeFeeRate = getExchangeFeeRate(destinationCurrencyKey); if (sourceCurrencyKey == sUSD || destinationCurrencyKey == sUSD) { return exchangeFeeRate; } // Is this a swing trade? long to short or short to long skipping sUSD. if ( (sourceCurrencyKey[0] == 0x73 && destinationCurrencyKey[0] == 0x69) || (sourceCurrencyKey[0] == 0x69 && destinationCurrencyKey[0] == 0x73) ) { // Double the exchange fee exchangeFeeRate = exchangeFeeRate.mul(2); } return exchangeFeeRate; } function getAmountsForExchange( uint sourceAmount, bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey ) external view returns ( uint amountReceived, uint fee, uint exchangeFeeRate ) { (amountReceived, fee, exchangeFeeRate, , ) = _getAmountsForExchangeMinusFees( sourceAmount, sourceCurrencyKey, destinationCurrencyKey ); } function _getAmountsForExchangeMinusFees( uint sourceAmount, bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey ) internal view returns ( uint amountReceived, uint fee, uint exchangeFeeRate, uint sourceRate, uint destinationRate ) { uint destinationAmount; (destinationAmount, sourceRate, destinationRate) = exchangeRates().effectiveValueAndRates( sourceCurrencyKey, sourceAmount, destinationCurrencyKey ); exchangeFeeRate = _feeRateForExchange(sourceCurrencyKey, destinationCurrencyKey); amountReceived = _getAmountReceivedForExchange(destinationAmount, exchangeFeeRate); fee = destinationAmount.sub(amountReceived); } function _getAmountReceivedForExchange(uint destinationAmount, uint exchangeFeeRate) internal pure returns (uint amountReceived) { amountReceived = destinationAmount.multiplyDecimal(SafeDecimalMath.unit().sub(exchangeFeeRate)); } function appendExchange( address account, bytes32 src, uint amount, bytes32 dest, uint amountReceived, uint exchangeFeeRate ) internal { IExchangeRates exRates = exchangeRates(); uint roundIdForSrc = exRates.getCurrentRoundId(src); uint roundIdForDest = exRates.getCurrentRoundId(dest); exchangeState().appendExchangeEntry( account, src, amount, dest, amountReceived, exchangeFeeRate, now, roundIdForSrc, roundIdForDest ); emit ExchangeEntryAppended( account, src, amount, dest, amountReceived, exchangeFeeRate, roundIdForSrc, roundIdForDest ); } function getRoundIdsAtPeriodEnd(IExchangeState.ExchangeEntry memory exchangeEntry) internal view returns (uint srcRoundIdAtPeriodEnd, uint destRoundIdAtPeriodEnd) { IExchangeRates exRates = exchangeRates(); uint _waitingPeriodSecs = getWaitingPeriodSecs(); srcRoundIdAtPeriodEnd = exRates.getLastRoundIdBeforeElapsedSecs( exchangeEntry.src, exchangeEntry.roundIdForSrc, exchangeEntry.timestamp, _waitingPeriodSecs ); destRoundIdAtPeriodEnd = exRates.getLastRoundIdBeforeElapsedSecs( exchangeEntry.dest, exchangeEntry.roundIdForDest, exchangeEntry.timestamp, _waitingPeriodSecs ); } // ========== MODIFIERS ========== modifier onlySynthetixorSynth() { ISynthetix _synthetix = synthetix(); require( msg.sender == address(_synthetix) || _synthetix.synthsByAddress(msg.sender) != bytes32(0), "Exchanger: Only synthetix or a synth contract can perform this action" ); _; } modifier onlyExchangeRates() { IExchangeRates _exchangeRates = exchangeRates(); require(msg.sender == address(_exchangeRates), "Restricted to ExchangeRates"); _; } // ========== EVENTS ========== event ExchangeEntryAppended( address indexed account, bytes32 src, uint256 amount, bytes32 dest, uint256 amountReceived, uint256 exchangeFeeRate, uint256 roundIdForSrc, uint256 roundIdForDest ); event ExchangeEntrySettled( address indexed from, bytes32 src, uint256 amount, bytes32 dest, uint256 reclaim, uint256 rebate, uint256 srcRoundIdAtPeriodEnd, uint256 destRoundIdAtPeriodEnd, uint256 exchangeTimestamp ); } // https://docs.synthetix.io/contracts/source/contracts/minimalproxyfactory contract MinimalProxyFactory { function _cloneAsMinimalProxy(address _base, string memory _revertMsg) internal returns (address clone) { bytes memory createData = _generateMinimalProxyCreateData(_base); assembly { clone := create( 0, // no value add(createData, 0x20), // data 55 // data is always 55 bytes (10 constructor + 45 code) ) } // If CREATE fails for some reason, address(0) is returned require(clone != address(0), _revertMsg); } function _generateMinimalProxyCreateData(address _base) internal pure returns (bytes memory) { return abi.encodePacked( //---- constructor ----- bytes10(0x3d602d80600a3d3981f3), //---- proxy code ----- bytes10(0x363d3d373d3d3d363d73), _base, bytes15(0x5af43d82803e903d91602b57fd5bf3) ); } } /** * @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 `ERC20Mintable`. * * *For a detailed writeup see our guide [How to implement supply * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).* * * 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 IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; /** * @dev See `IERC20.totalSupply`. */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev See `IERC20.balanceOf`. */ function balanceOf(address account) public view 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 returns (bool) { _transfer(msg.sender, recipient, amount); return true; } /** * @dev See `IERC20.allowance`. */ function allowance(address owner, address spender) public view returns (uint256) { return _allowances[owner][spender]; } /** * @dev See `IERC20.approve`. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 value) public returns (bool) { _approve(msg.sender, spender, value); 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 `value`. * - the caller must have allowance for `sender`'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) { _transfer(sender, recipient, amount); _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(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 returns (bool) { _approve(msg.sender, spender, _allowances[msg.sender][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 returns (bool) { _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue)); 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 { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _balances[sender] = _balances[sender].sub(amount); _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 { require(account != address(0), "ERC20: mint to the zero address"); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destoys `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 value) internal { require(account != address(0), "ERC20: burn from the zero address"); _totalSupply = _totalSupply.sub(value); _balances[account] = _balances[account].sub(value); emit Transfer(account, address(0), value); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is 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 value) internal { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = value; emit Approval(owner, spender, value); } /** * @dev Destoys `amount` tokens from `account`.`amount` is then deducted * from the caller's allowance. * * See `_burn` and `_approve`. */ function _burnFrom(address account, uint256 amount) internal { _burn(account, amount); _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount)); } } // Inheritance // Libraries // Internal references // Note: use OZ's IERC20 here as using ours will complain about conflicting names // during the build // https://docs.synthetix.io/contracts/source/contracts/virtualsynth // Note: this contract should be treated as an abstract contract and should not be directly deployed. // On higher versions of solidity, it would be marked with the `abstract` keyword. // This contracts implements logic that is only intended to be accessed behind a proxy. // For the deployed "mastercopy" version, see VirtualSynthMastercopy. contract VirtualSynth is ERC20, IVirtualSynth { using SafeMath for uint; using SafeDecimalMath for uint; IERC20 public synth; IAddressResolver public resolver; bool public settled = false; uint8 public constant decimals = 18; // track initial supply so we can calculate the rate even after all supply is burned uint public initialSupply; // track final settled amount of the synth so we can calculate the rate after settlement uint public settledAmount; bytes32 public currencyKey; bool public initialized = false; function initialize( IERC20 _synth, IAddressResolver _resolver, address _recipient, uint _amount, bytes32 _currencyKey ) external { require(!initialized, "vSynth already initialized"); initialized = true; synth = _synth; resolver = _resolver; currencyKey = _currencyKey; // Assumption: the synth will be issued to us within the same transaction, // and this supply matches that _mint(_recipient, _amount); initialSupply = _amount; // Note: the ERC20 base contract does not have a constructor, so we do not have to worry // about initializing its state separately } // INTERNALS function exchanger() internal view returns (IExchanger) { return IExchanger(resolver.requireAndGetAddress("Exchanger", "Exchanger contract not found")); } function secsLeft() internal view returns (uint) { return exchanger().maxSecsLeftInWaitingPeriod(address(this), currencyKey); } function calcRate() internal view returns (uint) { if (initialSupply == 0) { return 0; } uint synthBalance; if (!settled) { synthBalance = IERC20(address(synth)).balanceOf(address(this)); (uint reclaim, uint rebate, ) = exchanger().settlementOwing(address(this), currencyKey); if (reclaim > 0) { synthBalance = synthBalance.sub(reclaim); } else if (rebate > 0) { synthBalance = synthBalance.add(rebate); } } else { synthBalance = settledAmount; } return synthBalance.divideDecimalRound(initialSupply); } function balanceUnderlying(address account) internal view returns (uint) { uint vBalanceOfAccount = balanceOf(account); return vBalanceOfAccount.multiplyDecimalRound(calcRate()); } function settleSynth() internal { if (settled) { return; } settled = true; exchanger().settle(address(this), currencyKey); settledAmount = IERC20(address(synth)).balanceOf(address(this)); emit Settled(totalSupply(), settledAmount); } // VIEWS function name() external view returns (string memory) { return string(abi.encodePacked("Virtual Synth ", currencyKey)); } function symbol() external view returns (string memory) { return string(abi.encodePacked("v", currencyKey)); } // get the rate of the vSynth to the synth. function rate() external view returns (uint) { return calcRate(); } // show the balance of the underlying synth that the given address has, given // their proportion of totalSupply function balanceOfUnderlying(address account) external view returns (uint) { return balanceUnderlying(account); } function secsLeftInWaitingPeriod() external view returns (uint) { return secsLeft(); } function readyToSettle() external view returns (bool) { return secsLeft() == 0; } // PUBLIC FUNCTIONS // Perform settlement of the underlying exchange if required, // then burn the accounts vSynths and transfer them their owed balanceOfUnderlying function settle(address account) external { settleSynth(); IERC20(address(synth)).transfer(account, balanceUnderlying(account)); _burn(account, balanceOf(account)); } event Settled(uint totalSupply, uint amountAfterSettled); } // Inheritance // Internal references // https://docs.synthetix.io/contracts/source/contracts/exchangerwithvirtualsynth contract ExchangerWithVirtualSynth is MinimalProxyFactory, Exchanger { constructor(address _owner, address _resolver) public MinimalProxyFactory() Exchanger(_owner, _resolver) {} /* ========== ADDRESS RESOLVER CONFIGURATION ========== */ bytes32 private constant CONTRACT_VIRTUALSYNTH_MASTERCOPY = "VirtualSynthMastercopy"; function resolverAddressesRequired() public view returns (bytes32[] memory addresses) { bytes32[] memory existingAddresses = Exchanger.resolverAddressesRequired(); bytes32[] memory newAddresses = new bytes32[](1); newAddresses[0] = CONTRACT_VIRTUALSYNTH_MASTERCOPY; addresses = combineArrays(existingAddresses, newAddresses); } /* ========== INTERNAL FUNCTIONS ========== */ function _virtualSynthMastercopy() internal view returns (address) { return requireAndGetAddress(CONTRACT_VIRTUALSYNTH_MASTERCOPY); } function _createVirtualSynth( IERC20 synth, address recipient, uint amount, bytes32 currencyKey ) internal returns (IVirtualSynth) { // prevent inverse synths from being allowed due to purgeability require(currencyKey[0] != 0x69, "Cannot virtualize this synth"); VirtualSynth vSynth = VirtualSynth(_cloneAsMinimalProxy(_virtualSynthMastercopy(), "Could not create new vSynth")); vSynth.initialize(synth, resolver, recipient, amount, currencyKey); emit VirtualSynthCreated(address(synth), recipient, address(vSynth), currencyKey, amount); return IVirtualSynth(address(vSynth)); } event VirtualSynthCreated( address indexed synth, address indexed recipient, address vSynth, bytes32 currencyKey, uint amount ); }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"address","name":"_resolver","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"name","type":"bytes32"},{"indexed":false,"internalType":"address","name":"destination","type":"address"}],"name":"CacheUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bytes32","name":"src","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"dest","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amountReceived","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"exchangeFeeRate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundIdForSrc","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundIdForDest","type":"uint256"}],"name":"ExchangeEntryAppended","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"bytes32","name":"src","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"dest","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"reclaim","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rebate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"srcRoundIdAtPeriodEnd","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"destRoundIdAtPeriodEnd","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"exchangeTimestamp","type":"uint256"}],"name":"ExchangeEntrySettled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"synth","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"address","name":"vSynth","type":"address"},{"indexed":false,"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"VirtualSynthCreated","type":"event"},{"constant":true,"inputs":[],"name":"CIRCUIT_BREAKER_SUSPENSION_REASON","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"refunded","type":"uint256"}],"name":"calculateAmountAfterSettlement","outputs":[{"internalType":"uint256","name":"amountAfterSettlement","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"},{"internalType":"address","name":"destinationAddress","type":"address"}],"name":"exchange","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"exchangeForAddress","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"}],"name":"exchangeOnBehalf","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"exchangeForAddress","type":"address"},{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"},{"internalType":"address","name":"originator","type":"address"},{"internalType":"bytes32","name":"trackingCode","type":"bytes32"}],"name":"exchangeOnBehalfWithTracking","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"},{"internalType":"address","name":"destinationAddress","type":"address"},{"internalType":"address","name":"originator","type":"address"},{"internalType":"bytes32","name":"trackingCode","type":"bytes32"}],"name":"exchangeWithTracking","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"},{"internalType":"address","name":"destinationAddress","type":"address"},{"internalType":"bytes32","name":"trackingCode","type":"bytes32"}],"name":"exchangeWithVirtual","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"},{"internalType":"contract IVirtualSynth","name":"vSynth","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"}],"name":"feeRateForExchange","outputs":[{"internalType":"uint256","name":"exchangeFeeRate","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"sourceAmount","type":"uint256"},{"internalType":"bytes32","name":"sourceCurrencyKey","type":"bytes32"},{"internalType":"bytes32","name":"destinationCurrencyKey","type":"bytes32"}],"name":"getAmountsForExchange","outputs":[{"internalType":"uint256","name":"amountReceived","type":"uint256"},{"internalType":"uint256","name":"fee","type":"uint256"},{"internalType":"uint256","name":"exchangeFeeRate","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"hasWaitingPeriodOrSettlementOwing","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isResolverCached","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"isSynthRateInvalid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"lastExchangeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"maxSecsLeftInWaitingPeriod","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"nominateNewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"nominatedOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"priceDeviationThresholdFactor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"rebuildCache","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"resolver","outputs":[{"internalType":"contract AddressResolver","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"resolverAddressesRequired","outputs":[{"internalType":"bytes32[]","name":"addresses","type":"bytes32[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"},{"internalType":"uint256","name":"rate","type":"uint256"}],"name":"setLastExchangeRateForSynth","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"settle","outputs":[{"internalType":"uint256","name":"reclaimed","type":"uint256"},{"internalType":"uint256","name":"refunded","type":"uint256"},{"internalType":"uint256","name":"numEntriesSettled","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"settlementOwing","outputs":[{"internalType":"uint256","name":"reclaimAmount","type":"uint256"},{"internalType":"uint256","name":"rebateAmount","type":"uint256"},{"internalType":"uint256","name":"numEntries","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes32","name":"currencyKey","type":"bytes32"}],"name":"suspendSynthWithInvalidRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"tradingRewardsEnabled","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"waitingPeriodSecs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000de910777c787903f78c89e7a0bf7f4c435cbb1fe0000000000000000000000004e3b31eb0e5cb73641ee1e65e7dcefe520ba3ef2
-----Decoded View---------------
Arg [0] : _owner (address): 0xDe910777C787903F78C89e7a0bf7F4C435cBB1Fe
Arg [1] : _resolver (address): 0x4E3b31eB0E5CB73641EE1E65E7dCEFe520bA3ef2
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000de910777c787903f78c89e7a0bf7f4c435cbb1fe
Arg [1] : 0000000000000000000000004e3b31eb0e5cb73641ee1e65e7dcefe520ba3ef2
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Multichain Portfolio | 26 Chains
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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.