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Overview
ETH Balance
0 ETH
Eth Value
$0.00More Info
Private Name Tags
ContractCreator
Latest 25 from a total of 80 transactions
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| Settle | 11360147 | 1477 days ago | IN | 0 ETH | 0.01927305 | ||||
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| Settle | 11358225 | 1477 days ago | IN | 0 ETH | 0.01062908 | ||||
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| 11252255 | 1494 days ago | Contract Creation | 0 ETH | |||
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| 11247756 | 1494 days ago | Contract Creation | 0 ETH |
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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 2020-11-13
*/
/*
____ __ __ __ _
/ __/__ __ ___ / /_ / / ___ / /_ (_)__ __
_\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
/___/
* 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
* - MixinResolver
* - MixinSystemSettings
* - Owned
* Libraries:
* - SafeDecimalMath
* - SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2020 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
// https://docs.synthetix.io/contracts/source/contracts/addressresolver
contract AddressResolver is Owned, IAddressResolver {
mapping(bytes32 => address) public repository;
constructor(address _owner) public Owned(_owner) {}
/* ========== MUTATIVE 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++) {
repository[names[i]] = destinations[i];
}
}
/* ========== VIEWS ========== */
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));
}
}
// Inheritance
// Internal references
// https://docs.synthetix.io/contracts/source/contracts/mixinresolver
contract MixinResolver is Owned {
AddressResolver public resolver;
mapping(bytes32 => address) private addressCache;
bytes32[] public resolverAddressesRequired;
uint public constant MAX_ADDRESSES_FROM_RESOLVER = 24;
constructor(address _resolver, bytes32[MAX_ADDRESSES_FROM_RESOLVER] memory _addressesToCache) internal {
// This contract is abstract, and thus cannot be instantiated directly
require(owner != address(0), "Owner must be set");
for (uint i = 0; i < _addressesToCache.length; i++) {
if (_addressesToCache[i] != bytes32(0)) {
resolverAddressesRequired.push(_addressesToCache[i]);
} else {
// End early once an empty item is found - assumes there are no empty slots in
// _addressesToCache
break;
}
}
resolver = AddressResolver(_resolver);
// Do not sync the cache as addresses may not be in the resolver yet
}
/* ========== SETTERS ========== */
function setResolverAndSyncCache(AddressResolver _resolver) external onlyOwner {
resolver = _resolver;
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[i];
// Note: can only be invoked once the resolver has all the targets needed added
addressCache[name] = resolver.requireAndGetAddress(name, "Resolver missing target");
}
}
/* ========== VIEWS ========== */
function requireAndGetAddress(bytes32 name, string memory reason) internal view returns (address) {
address _foundAddress = addressCache[name];
require(_foundAddress != address(0), reason);
return _foundAddress;
}
// Note: this could be made external in a utility contract if addressCache was made public
// (used for deployment)
function isResolverCached(AddressResolver _resolver) external view returns (bool) {
if (resolver != _resolver) {
return false;
}
// otherwise, check everything
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[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;
}
// Note: can be made external into a utility contract (used for deployment)
function getResolverAddressesRequired()
external
view
returns (bytes32[MAX_ADDRESSES_FROM_RESOLVER] memory addressesRequired)
{
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
addressesRequired[i] = resolverAddressesRequired[i];
}
}
/* ========== INTERNAL FUNCTIONS ========== */
function appendToAddressCache(bytes32 name) internal {
resolverAddressesRequired.push(name);
require(resolverAddressesRequired.length < MAX_ADDRESSES_FROM_RESOLVER, "Max resolver cache size met");
// Because this is designed to be called internally in constructors, we don't
// check the address exists already in the resolver
addressCache[name] = resolver.getAddress(name);
}
}
// 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 private constant CONTRACT_FLEXIBLESTORAGE = "FlexibleStorage";
constructor() internal {
appendToAddressCache(CONTRACT_FLEXIBLESTORAGE);
}
function flexibleStorage() internal view returns (IFlexibleStorage) {
return IFlexibleStorage(requireAndGetAddress(CONTRACT_FLEXIBLESTORAGE, "Missing FlexibleStorage address"));
}
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 requireSynthActive(bytes32 currencyKey) external view;
function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;
function synthSuspension(bytes32 currencyKey) external view returns (bool suspended, uint248 reason);
// 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
);
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 recoverEther(address payable recoverAddress) 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;
}
// https://docs.synthetix.io/contracts/source/interfaces/idebtcache
interface IDebtCache {
// Views
function cachedDebt() external view returns (uint);
function cachedSynthDebt(bytes32 currencyKey) external view returns (uint);
function cacheTimestamp() external view returns (uint);
function cacheInvalid() external view returns (bool);
function cacheStale() external view returns (bool);
function currentSynthDebts(bytes32[] calldata currencyKeys)
external
view
returns (uint[] memory debtValues, bool anyRateIsInvalid);
function cachedSynthDebts(bytes32[] calldata currencyKeys) external view returns (uint[] memory debtValues);
function currentDebt() external view returns (uint debt, bool anyRateIsInvalid);
function cacheInfo()
external
view
returns (
uint debt,
uint timestamp,
bool isInvalid,
bool isStale
);
// Mutative functions
function takeDebtSnapshot() external;
function updateCachedSynthDebts(bytes32[] calldata currencyKeys) 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, MixinResolver, 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";
bytes32[24] private addressesToCache = [
CONTRACT_SYSTEMSTATUS,
CONTRACT_EXCHANGESTATE,
CONTRACT_EXRATES,
CONTRACT_SYNTHETIX,
CONTRACT_FEEPOOL,
CONTRACT_TRADING_REWARDS,
CONTRACT_DELEGATEAPPROVALS,
CONTRACT_ISSUER,
CONTRACT_DEBTCACHE
];
constructor(address _owner, address _resolver)
public
Owned(_owner)
MixinResolver(_resolver, addressesToCache)
MixinSystemSettings()
{}
/* ========== VIEWS ========== */
function systemStatus() internal view returns (ISystemStatus) {
return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS, "Missing SystemStatus address"));
}
function exchangeState() internal view returns (IExchangeState) {
return IExchangeState(requireAndGetAddress(CONTRACT_EXCHANGESTATE, "Missing ExchangeState address"));
}
function exchangeRates() internal view returns (IExchangeRates) {
return IExchangeRates(requireAndGetAddress(CONTRACT_EXRATES, "Missing ExchangeRates address"));
}
function synthetix() internal view returns (ISynthetix) {
return ISynthetix(requireAndGetAddress(CONTRACT_SYNTHETIX, "Missing Synthetix address"));
}
function feePool() internal view returns (IFeePool) {
return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL, "Missing FeePool address"));
}
function tradingRewards() internal view returns (ITradingRewards) {
return ITradingRewards(requireAndGetAddress(CONTRACT_TRADING_REWARDS, "Missing TradingRewards address"));
}
function delegateApprovals() internal view returns (IDelegateApprovals) {
return IDelegateApprovals(requireAndGetAddress(CONTRACT_DELEGATEAPPROVALS, "Missing DelegateApprovals address"));
}
function issuer() internal view returns (IIssuer) {
return IIssuer(requireAndGetAddress(CONTRACT_ISSUER, "Missing Issuer address"));
}
function debtCache() internal view returns (IExchangerInternalDebtCache) {
return IExchangerInternalDebtCache(requireAndGetAddress(CONTRACT_DEBTCACHE, "Missing DebtCache address"));
}
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
);
// 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("Not supported in 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, // API for source in case pricing model evolves to include source rate /* sourceCurrencyKey */
bytes32 destinationCurrencyKey
) internal view returns (uint exchangeFeeRate) {
return getExchangeFeeRate(destinationCurrencyKey);
}
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
);
}
/**
* @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
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;
constructor(
IERC20 _synth,
IAddressResolver _resolver,
address _recipient,
uint _amount,
bytes32 _currencyKey
) public ERC20() {
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;
}
// 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 Exchanger {
constructor(address _owner, address _resolver) public Exchanger(_owner, _resolver) {}
function _createVirtualSynth(
IERC20 synth,
address recipient,
uint amount,
bytes32 currencyKey
) internal returns (IVirtualSynth vSynth) {
// prevent inverse synths from being allowed due to purgeability
require(currencyKey[0] != 0x69, "Cannot virtualize this synth");
vSynth = new VirtualSynth(synth, resolver, recipient, amount, currencyKey);
emit VirtualSynthCreated(address(synth), recipient, address(vSynth), currencyKey, amount);
}
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
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AddressResolver","name":"_resolver","type":"address"}],"name":"setResolverAndSyncCache","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 | 30 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.