// Sources flattened with hardhat v2.12.0 https://hardhat.org
// File contracts/libraries/token/IERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File contracts/libraries/utils/ReentrancyGuard.sol
pragma solidity 0.6.12;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// File contracts/libraries/math/SafeMath.sol
pragma solidity 0.6.12;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File contracts/libraries/utils/Address.sol
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File contracts/libraries/token/SafeERC20.sol
pragma solidity 0.6.12;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File contracts/core/interfaces/IVaultUtils.sol
pragma solidity 0.6.12;
interface IVaultUtils {
function updateCumulativeFundingRate(address _collateralToken, address _indexToken) external returns (bool);
function validateIncreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external view;
function validateDecreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external view;
function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
function getEntryFundingRate(address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256);
function getPositionFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _sizeDelta) external view returns (uint256);
function getFundingFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _size, uint256 _entryFundingRate) external view returns (uint256);
function getBuyUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
function getSellUsdgFeeBasisPoints(address _token, uint256 _usdgAmount) external view returns (uint256);
function getSwapFeeBasisPoints(address _tokenIn, address _tokenOut, uint256 _usdgAmount) external view returns (uint256);
function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
}
// File contracts/core/interfaces/IVaultPriceFeed.sol
pragma solidity 0.6.12;
interface IVaultPriceFeed {
function adjustmentBasisPoints(address _token) external view returns (uint256);
function isAdjustmentAdditive(address _token) external view returns (bool);
function setAdjustment(address _token, bool _isAdditive, uint256 _adjustmentBps) external;
function setUseV2Pricing(bool _useV2Pricing) external;
function setIsAmmEnabled(bool _isEnabled) external;
function setIsSecondaryPriceEnabled(bool _isEnabled) external;
function setSpreadBasisPoints(address _token, uint256 _spreadBasisPoints) external;
function setSpreadThresholdBasisPoints(uint256 _spreadThresholdBasisPoints) external;
function setFavorPrimaryPrice(bool _favorPrimaryPrice) external;
function setPriceSampleSpace(uint256 _priceSampleSpace) external;
function setMaxStrictPriceDeviation(uint256 _maxStrictPriceDeviation) external;
function getPrice(address _token, bool _maximise, bool _includeAmmPrice, bool _useSwapPricing) external view returns (uint256);
function getAmmPrice(address _token) external view returns (uint256);
function getLatestPrimaryPrice(address _token) external view returns (uint256);
function getPrimaryPrice(address _token, bool _maximise) external view returns (uint256);
function setTokenConfig(
address _token,
address _priceFeed,
uint256 _priceDecimals,
bool _isStrictStable
) external;
}
// File contracts/core/interfaces/IVault.sol
pragma solidity 0.6.12;
interface IVault {
function isInitialized() external view returns (bool);
function isSwapEnabled() external view returns (bool);
function isLeverageEnabled() external view returns (bool);
function setVaultUtils(IVaultUtils _vaultUtils) external;
function setError(uint256 _errorCode, string calldata _error) external;
function router() external view returns (address);
function usdg() external view returns (address);
function gov() external view returns (address);
function whitelistedTokenCount() external view returns (uint256);
function maxLeverage() external view returns (uint256);
function minProfitTime() external view returns (uint256);
function hasDynamicFees() external view returns (bool);
function fundingInterval() external view returns (uint256);
function totalTokenWeights() external view returns (uint256);
function getTargetUsdgAmount(address _token) external view returns (uint256);
function inManagerMode() external view returns (bool);
function inPrivateLiquidationMode() external view returns (bool);
function maxGasPrice() external view returns (uint256);
function approvedRouters(address _account, address _router) external view returns (bool);
function isLiquidator(address _account) external view returns (bool);
function isManager(address _account) external view returns (bool);
function minProfitBasisPoints(address _token) external view returns (uint256);
function tokenBalances(address _token) external view returns (uint256);
function lastFundingTimes(address _token) external view returns (uint256);
function setMaxLeverage(uint256 _maxLeverage) external;
function setInManagerMode(bool _inManagerMode) external;
function setManager(address _manager, bool _isManager) external;
function setIsSwapEnabled(bool _isSwapEnabled) external;
function setIsLeverageEnabled(bool _isLeverageEnabled) external;
function setMaxGasPrice(uint256 _maxGasPrice) external;
function setUsdgAmount(address _token, uint256 _amount) external;
function setBufferAmount(address _token, uint256 _amount) external;
function setMaxGlobalShortSize(address _token, uint256 _amount) external;
function setInPrivateLiquidationMode(bool _inPrivateLiquidationMode) external;
function setLiquidator(address _liquidator, bool _isActive) external;
function setFundingRate(uint256 _fundingInterval, uint256 _fundingRateFactor, uint256 _stableFundingRateFactor) external;
function setFees(
uint256 _taxBasisPoints,
uint256 _stableTaxBasisPoints,
uint256 _mintBurnFeeBasisPoints,
uint256 _swapFeeBasisPoints,
uint256 _stableSwapFeeBasisPoints,
uint256 _marginFeeBasisPoints,
uint256 _liquidationFeeUsd,
uint256 _minProfitTime,
bool _hasDynamicFees
) external;
function setTokenConfig(
address _token,
uint256 _tokenDecimals,
uint256 _redemptionBps,
uint256 _minProfitBps,
uint256 _maxUsdgAmount,
bool _isStable,
bool _isShortable
) external;
function setPriceFeed(address _priceFeed) external;
function withdrawFees(address _token, address _receiver) external returns (uint256);
function directPoolDeposit(address _token) external;
function buyUSDG(address _token, address _receiver) external returns (uint256);
function sellUSDG(address _token, address _receiver) external returns (uint256);
function swap(address _tokenIn, address _tokenOut, address _receiver) external returns (uint256);
function increasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external;
function decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external returns (uint256);
function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) external view returns (uint256, uint256);
function liquidatePosition(address _account, address _collateralToken, address _indexToken, bool _isLong, address _feeReceiver) external;
function tokenToUsdMin(address _token, uint256 _tokenAmount) external view returns (uint256);
function priceFeed() external view returns (address);
function fundingRateFactor() external view returns (uint256);
function stableFundingRateFactor() external view returns (uint256);
function cumulativeFundingRates(address _token) external view returns (uint256);
function getNextFundingRate(address _token) external view returns (uint256);
function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
function liquidationFeeUsd() external view returns (uint256);
function taxBasisPoints() external view returns (uint256);
function stableTaxBasisPoints() external view returns (uint256);
function mintBurnFeeBasisPoints() external view returns (uint256);
function swapFeeBasisPoints() external view returns (uint256);
function stableSwapFeeBasisPoints() external view returns (uint256);
function marginFeeBasisPoints() external view returns (uint256);
function allWhitelistedTokensLength() external view returns (uint256);
function allWhitelistedTokens(uint256) external view returns (address);
function whitelistedTokens(address _token) external view returns (bool);
function stableTokens(address _token) external view returns (bool);
function shortableTokens(address _token) external view returns (bool);
function feeReserves(address _token) external view returns (uint256);
function globalShortSizes(address _token) external view returns (uint256);
function globalShortAveragePrices(address _token) external view returns (uint256);
function maxGlobalShortSizes(address _token) external view returns (uint256);
function tokenDecimals(address _token) external view returns (uint256);
function tokenWeights(address _token) external view returns (uint256);
function guaranteedUsd(address _token) external view returns (uint256);
function poolAmounts(address _token) external view returns (uint256);
function bufferAmounts(address _token) external view returns (uint256);
function reservedAmounts(address _token) external view returns (uint256);
function usdgAmounts(address _token) external view returns (uint256);
function maxUsdgAmounts(address _token) external view returns (uint256);
function getRedemptionAmount(address _token, uint256 _usdgAmount) external view returns (uint256);
function getMaxPrice(address _token) external view returns (uint256);
function getMinPrice(address _token) external view returns (uint256);
function getDelta(address _indexToken, uint256 _size, uint256 _averagePrice, bool _isLong, uint256 _lastIncreasedTime) external view returns (bool, uint256);
function getPosition(address _account, address _collateralToken, address _indexToken, bool _isLong) external view returns (uint256, uint256, uint256, uint256, uint256, uint256, bool, uint256);
}
// File contracts/tokens/interfaces/IUSDG.sol
pragma solidity 0.6.12;
interface IUSDG {
function addVault(address _vault) external;
function removeVault(address _vault) external;
function mint(address _account, uint256 _amount) external;
function burn(address _account, uint256 _amount) external;
}
// File contracts/core/Vault.sol
pragma solidity 0.6.12;
contract Vault is ReentrancyGuard, IVault {
using SafeMath for uint256;
using SafeERC20 for IERC20;
struct Position {
uint256 size;
uint256 collateral;
uint256 averagePrice;
uint256 entryFundingRate;
uint256 reserveAmount;
int256 realisedPnl;
uint256 lastIncreasedTime;
}
uint256 public constant BASIS_POINTS_DIVISOR = 10000;
uint256 public constant FUNDING_RATE_PRECISION = 1000000;
uint256 public constant PRICE_PRECISION = 10 ** 30;
uint256 public constant MIN_LEVERAGE = 10000; // 1x
uint256 public constant USDG_DECIMALS = 18;
uint256 public constant MAX_FEE_BASIS_POINTS = 500; // 5%
uint256 public constant MAX_LIQUIDATION_FEE_USD = 100 * PRICE_PRECISION; // 100 USD
uint256 public constant MIN_FUNDING_RATE_INTERVAL = 1 hours;
uint256 public constant MAX_FUNDING_RATE_FACTOR = 10000; // 1%
bool public override isInitialized;
bool public override isSwapEnabled = true;
bool public override isLeverageEnabled = true;
IVaultUtils public vaultUtils;
address public errorController;
address public override router;
address public override priceFeed;
address public override usdg;
address public override gov;
uint256 public override whitelistedTokenCount;
uint256 public override maxLeverage = 50 * 10000; // 50x
uint256 public override liquidationFeeUsd;
uint256 public override taxBasisPoints = 50; // 0.5%
uint256 public override stableTaxBasisPoints = 20; // 0.2%
uint256 public override mintBurnFeeBasisPoints = 30; // 0.3%
uint256 public override swapFeeBasisPoints = 30; // 0.3%
uint256 public override stableSwapFeeBasisPoints = 4; // 0.04%
uint256 public override marginFeeBasisPoints = 10; // 0.1%
uint256 public override minProfitTime;
bool public override hasDynamicFees = false;
uint256 public override fundingInterval = 8 hours;
uint256 public override fundingRateFactor;
uint256 public override stableFundingRateFactor;
uint256 public override totalTokenWeights;
bool public includeAmmPrice = true;
bool public useSwapPricing = false;
bool public override inManagerMode = false;
bool public override inPrivateLiquidationMode = false;
uint256 public override maxGasPrice;
mapping (address => mapping (address => bool)) public override approvedRouters;
mapping (address => bool) public override isLiquidator;
mapping (address => bool) public override isManager;
address[] public override allWhitelistedTokens;
mapping (address => bool) public override whitelistedTokens;
mapping (address => uint256) public override tokenDecimals;
mapping (address => uint256) public override minProfitBasisPoints;
mapping (address => bool) public override stableTokens;
mapping (address => bool) public override shortableTokens;
// tokenBalances is used only to determine _transferIn values
mapping (address => uint256) public override tokenBalances;
// tokenWeights allows customisation of index composition
mapping (address => uint256) public override tokenWeights;
// usdgAmounts tracks the amount of USDG debt for each whitelisted token
mapping (address => uint256) public override usdgAmounts;
// maxUsdgAmounts allows setting a max amount of USDG debt for a token
mapping (address => uint256) public override maxUsdgAmounts;
// poolAmounts tracks the number of received tokens that can be used for leverage
// this is tracked separately from tokenBalances to exclude funds that are deposited as margin collateral
mapping (address => uint256) public override poolAmounts;
// reservedAmounts tracks the number of tokens reserved for open leverage positions
mapping (address => uint256) public override reservedAmounts;
// bufferAmounts allows specification of an amount to exclude from swaps
// this can be used to ensure a certain amount of liquidity is available for leverage positions
mapping (address => uint256) public override bufferAmounts;
// guaranteedUsd tracks the amount of USD that is "guaranteed" by opened leverage positions
// this value is used to calculate the redemption values for selling of USDG
// this is an estimated amount, it is possible for the actual guaranteed value to be lower
// in the case of sudden price decreases, the guaranteed value should be corrected
// after liquidations are carried out
mapping (address => uint256) public override guaranteedUsd;
// cumulativeFundingRates tracks the funding rates based on utilization
mapping (address => uint256) public override cumulativeFundingRates;
// lastFundingTimes tracks the last time funding was updated for a token
mapping (address => uint256) public override lastFundingTimes;
// positions tracks all open positions
mapping (bytes32 => Position) public positions;
// feeReserves tracks the amount of fees per token
mapping (address => uint256) public override feeReserves;
mapping (address => uint256) public override globalShortSizes;
mapping (address => uint256) public override globalShortAveragePrices;
mapping (address => uint256) public override maxGlobalShortSizes;
mapping (uint256 => string) public errors;
event BuyUSDG(address account, address token, uint256 tokenAmount, uint256 usdgAmount, uint256 feeBasisPoints);
event SellUSDG(address account, address token, uint256 usdgAmount, uint256 tokenAmount, uint256 feeBasisPoints);
event Swap(address account, address tokenIn, address tokenOut, uint256 amountIn, uint256 amountOut, uint256 amountOutAfterFees, uint256 feeBasisPoints);
event IncreasePosition(
bytes32 key,
address account,
address collateralToken,
address indexToken,
uint256 collateralDelta,
uint256 sizeDelta,
bool isLong,
uint256 price,
uint256 fee
);
event DecreasePosition(
bytes32 key,
address account,
address collateralToken,
address indexToken,
uint256 collateralDelta,
uint256 sizeDelta,
bool isLong,
uint256 price,
uint256 fee
);
event LiquidatePosition(
bytes32 key,
address account,
address collateralToken,
address indexToken,
bool isLong,
uint256 size,
uint256 collateral,
uint256 reserveAmount,
int256 realisedPnl,
uint256 markPrice
);
event UpdatePosition(
bytes32 key,
uint256 size,
uint256 collateral,
uint256 averagePrice,
uint256 entryFundingRate,
uint256 reserveAmount,
int256 realisedPnl,
uint256 markPrice
);
event ClosePosition(
bytes32 key,
uint256 size,
uint256 collateral,
uint256 averagePrice,
uint256 entryFundingRate,
uint256 reserveAmount,
int256 realisedPnl
);
event UpdateFundingRate(address token, uint256 fundingRate);
event UpdatePnl(bytes32 key, bool hasProfit, uint256 delta);
event CollectSwapFees(address token, uint256 feeUsd, uint256 feeTokens);
event CollectMarginFees(address token, uint256 feeUsd, uint256 feeTokens);
event DirectPoolDeposit(address token, uint256 amount);
event IncreasePoolAmount(address token, uint256 amount);
event DecreasePoolAmount(address token, uint256 amount);
event IncreaseUsdgAmount(address token, uint256 amount);
event DecreaseUsdgAmount(address token, uint256 amount);
event IncreaseReservedAmount(address token, uint256 amount);
event DecreaseReservedAmount(address token, uint256 amount);
event IncreaseGuaranteedUsd(address token, uint256 amount);
event DecreaseGuaranteedUsd(address token, uint256 amount);
// once the parameters are verified to be working correctly,
// gov should be set to a timelock contract or a governance contract
constructor() public {
gov = msg.sender;
}
function initialize(
address _router,
address _usdg,
address _priceFeed,
uint256 _liquidationFeeUsd,
uint256 _fundingRateFactor,
uint256 _stableFundingRateFactor
) external {
_onlyGov();
_validate(!isInitialized, 1);
isInitialized = true;
router = _router;
usdg = _usdg;
priceFeed = _priceFeed;
liquidationFeeUsd = _liquidationFeeUsd;
fundingRateFactor = _fundingRateFactor;
stableFundingRateFactor = _stableFundingRateFactor;
}
function setVaultUtils(IVaultUtils _vaultUtils) external override {
_onlyGov();
vaultUtils = _vaultUtils;
}
function setErrorController(address _errorController) external {
_onlyGov();
errorController = _errorController;
}
function setError(uint256 _errorCode, string calldata _error) external override {
require(msg.sender == errorController, "Vault: invalid errorController");
errors[_errorCode] = _error;
}
function allWhitelistedTokensLength() external override view returns (uint256) {
return allWhitelistedTokens.length;
}
function setInManagerMode(bool _inManagerMode) external override {
_onlyGov();
inManagerMode = _inManagerMode;
}
function setManager(address _manager, bool _isManager) external override {
_onlyGov();
isManager[_manager] = _isManager;
}
function setInPrivateLiquidationMode(bool _inPrivateLiquidationMode) external override {
_onlyGov();
inPrivateLiquidationMode = _inPrivateLiquidationMode;
}
function setLiquidator(address _liquidator, bool _isActive) external override {
_onlyGov();
isLiquidator[_liquidator] = _isActive;
}
function setIsSwapEnabled(bool _isSwapEnabled) external override {
_onlyGov();
isSwapEnabled = _isSwapEnabled;
}
function setIsLeverageEnabled(bool _isLeverageEnabled) external override {
_onlyGov();
isLeverageEnabled = _isLeverageEnabled;
}
function setMaxGasPrice(uint256 _maxGasPrice) external override {
_onlyGov();
maxGasPrice = _maxGasPrice;
}
function setGov(address _gov) external {
_onlyGov();
gov = _gov;
}
function setPriceFeed(address _priceFeed) external override {
_onlyGov();
priceFeed = _priceFeed;
}
function setMaxLeverage(uint256 _maxLeverage) external override {
_onlyGov();
_validate(_maxLeverage > MIN_LEVERAGE, 2);
maxLeverage = _maxLeverage;
}
function setBufferAmount(address _token, uint256 _amount) external override {
_onlyGov();
bufferAmounts[_token] = _amount;
}
function setMaxGlobalShortSize(address _token, uint256 _amount) external override {
_onlyGov();
maxGlobalShortSizes[_token] = _amount;
}
function setFees(
uint256 _taxBasisPoints,
uint256 _stableTaxBasisPoints,
uint256 _mintBurnFeeBasisPoints,
uint256 _swapFeeBasisPoints,
uint256 _stableSwapFeeBasisPoints,
uint256 _marginFeeBasisPoints,
uint256 _liquidationFeeUsd,
uint256 _minProfitTime,
bool _hasDynamicFees
) external override {
_onlyGov();
_validate(_taxBasisPoints <= MAX_FEE_BASIS_POINTS, 3);
_validate(_stableTaxBasisPoints <= MAX_FEE_BASIS_POINTS, 4);
_validate(_mintBurnFeeBasisPoints <= MAX_FEE_BASIS_POINTS, 5);
_validate(_swapFeeBasisPoints <= MAX_FEE_BASIS_POINTS, 6);
_validate(_stableSwapFeeBasisPoints <= MAX_FEE_BASIS_POINTS, 7);
_validate(_marginFeeBasisPoints <= MAX_FEE_BASIS_POINTS, 8);
_validate(_liquidationFeeUsd <= MAX_LIQUIDATION_FEE_USD, 9);
taxBasisPoints = _taxBasisPoints;
stableTaxBasisPoints = _stableTaxBasisPoints;
mintBurnFeeBasisPoints = _mintBurnFeeBasisPoints;
swapFeeBasisPoints = _swapFeeBasisPoints;
stableSwapFeeBasisPoints = _stableSwapFeeBasisPoints;
marginFeeBasisPoints = _marginFeeBasisPoints;
liquidationFeeUsd = _liquidationFeeUsd;
minProfitTime = _minProfitTime;
hasDynamicFees = _hasDynamicFees;
}
function setFundingRate(uint256 _fundingInterval, uint256 _fundingRateFactor, uint256 _stableFundingRateFactor) external override {
_onlyGov();
_validate(_fundingInterval >= MIN_FUNDING_RATE_INTERVAL, 10);
_validate(_fundingRateFactor <= MAX_FUNDING_RATE_FACTOR, 11);
_validate(_stableFundingRateFactor <= MAX_FUNDING_RATE_FACTOR, 12);
fundingInterval = _fundingInterval;
fundingRateFactor = _fundingRateFactor;
stableFundingRateFactor = _stableFundingRateFactor;
}
function setTokenConfig(
address _token,
uint256 _tokenDecimals,
uint256 _tokenWeight,
uint256 _minProfitBps,
uint256 _maxUsdgAmount,
bool _isStable,
bool _isShortable
) external override {
_onlyGov();
// increment token count for the first time
if (!whitelistedTokens[_token]) {
whitelistedTokenCount = whitelistedTokenCount.add(1);
allWhitelistedTokens.push(_token);
}
uint256 _totalTokenWeights = totalTokenWeights;
_totalTokenWeights = _totalTokenWeights.sub(tokenWeights[_token]);
whitelistedTokens[_token] = true;
tokenDecimals[_token] = _tokenDecimals;
tokenWeights[_token] = _tokenWeight;
minProfitBasisPoints[_token] = _minProfitBps;
maxUsdgAmounts[_token] = _maxUsdgAmount;
stableTokens[_token] = _isStable;
shortableTokens[_token] = _isShortable;
totalTokenWeights = _totalTokenWeights.add(_tokenWeight);
// validate price feed
getMaxPrice(_token);
}
function clearTokenConfig(address _token) external {
_onlyGov();
_validate(whitelistedTokens[_token], 13);
totalTokenWeights = totalTokenWeights.sub(tokenWeights[_token]);
delete whitelistedTokens[_token];
delete tokenDecimals[_token];
delete tokenWeights[_token];
delete minProfitBasisPoints[_token];
delete maxUsdgAmounts[_token];
delete stableTokens[_token];
delete shortableTokens[_token];
whitelistedTokenCount = whitelistedTokenCount.sub(1);
}
function withdrawFees(address _token, address _receiver) external override returns (uint256) {
_onlyGov();
uint256 amount = feeReserves[_token];
if(amount == 0) { return 0; }
feeReserves[_token] = 0;
_transferOut(_token, amount, _receiver);
return amount;
}
function addRouter(address _router) external {
approvedRouters[msg.sender][_router] = true;
}
function removeRouter(address _router) external {
approvedRouters[msg.sender][_router] = false;
}
function setUsdgAmount(address _token, uint256 _amount) external override {
_onlyGov();
uint256 usdgAmount = usdgAmounts[_token];
if (_amount > usdgAmount) {
_increaseUsdgAmount(_token, _amount.sub(usdgAmount));
return;
}
_decreaseUsdgAmount(_token, usdgAmount.sub(_amount));
}
// the governance controlling this function should have a timelock
function upgradeVault(address _newVault, address _token, uint256 _amount) external {
_onlyGov();
IERC20(_token).safeTransfer(_newVault, _amount);
}
// deposit into the pool without minting USDG tokens
// useful in allowing the pool to become over-collaterised
function directPoolDeposit(address _token) external override nonReentrant {
_validate(whitelistedTokens[_token], 14);
uint256 tokenAmount = _transferIn(_token);
_validate(tokenAmount > 0, 15);
_increasePoolAmount(_token, tokenAmount);
emit DirectPoolDeposit(_token, tokenAmount);
}
function buyUSDG(address _token, address _receiver) external override nonReentrant returns (uint256) {
_validateManager();
_validate(whitelistedTokens[_token], 16);
useSwapPricing = true;
uint256 tokenAmount = _transferIn(_token);
_validate(tokenAmount > 0, 17);
updateCumulativeFundingRate(_token, _token);
uint256 price = getMinPrice(_token);
uint256 usdgAmount = tokenAmount.mul(price).div(PRICE_PRECISION);
usdgAmount = adjustForDecimals(usdgAmount, _token, usdg);
_validate(usdgAmount > 0, 18);
uint256 feeBasisPoints = vaultUtils.getBuyUsdgFeeBasisPoints(_token, usdgAmount);
uint256 amountAfterFees = _collectSwapFees(_token, tokenAmount, feeBasisPoints);
uint256 mintAmount = amountAfterFees.mul(price).div(PRICE_PRECISION);
mintAmount = adjustForDecimals(mintAmount, _token, usdg);
_increaseUsdgAmount(_token, mintAmount);
_increasePoolAmount(_token, amountAfterFees);
IUSDG(usdg).mint(_receiver, mintAmount);
emit BuyUSDG(_receiver, _token, tokenAmount, mintAmount, feeBasisPoints);
useSwapPricing = false;
return mintAmount;
}
function sellUSDG(address _token, address _receiver) external override nonReentrant returns (uint256) {
_validateManager();
_validate(whitelistedTokens[_token], 19);
useSwapPricing = true;
uint256 usdgAmount = _transferIn(usdg);
_validate(usdgAmount > 0, 20);
updateCumulativeFundingRate(_token, _token);
uint256 redemptionAmount = getRedemptionAmount(_token, usdgAmount);
_validate(redemptionAmount > 0, 21);
_decreaseUsdgAmount(_token, usdgAmount);
_decreasePoolAmount(_token, redemptionAmount);
IUSDG(usdg).burn(address(this), usdgAmount);
// the _transferIn call increased the value of tokenBalances[usdg]
// usually decreases in token balances are synced by calling _transferOut
// however, for usdg, the tokens are burnt, so _updateTokenBalance should
// be manually called to record the decrease in tokens
_updateTokenBalance(usdg);
uint256 feeBasisPoints = vaultUtils.getSellUsdgFeeBasisPoints(_token, usdgAmount);
uint256 amountOut = _collectSwapFees(_token, redemptionAmount, feeBasisPoints);
_validate(amountOut > 0, 22);
_transferOut(_token, amountOut, _receiver);
emit SellUSDG(_receiver, _token, usdgAmount, amountOut, feeBasisPoints);
useSwapPricing = false;
return amountOut;
}
function swap(address _tokenIn, address _tokenOut, address _receiver) external override nonReentrant returns (uint256) {
_validate(isSwapEnabled, 23);
_validate(whitelistedTokens[_tokenIn], 24);
_validate(whitelistedTokens[_tokenOut], 25);
_validate(_tokenIn != _tokenOut, 26);
useSwapPricing = true;
updateCumulativeFundingRate(_tokenIn, _tokenIn);
updateCumulativeFundingRate(_tokenOut, _tokenOut);
uint256 amountIn = _transferIn(_tokenIn);
_validate(amountIn > 0, 27);
uint256 priceIn = getMinPrice(_tokenIn);
uint256 priceOut = getMaxPrice(_tokenOut);
uint256 amountOut = amountIn.mul(priceIn).div(priceOut);
amountOut = adjustForDecimals(amountOut, _tokenIn, _tokenOut);
// adjust usdgAmounts by the same usdgAmount as debt is shifted between the assets
uint256 usdgAmount = amountIn.mul(priceIn).div(PRICE_PRECISION);
usdgAmount = adjustForDecimals(usdgAmount, _tokenIn, usdg);
uint256 feeBasisPoints = vaultUtils.getSwapFeeBasisPoints(_tokenIn, _tokenOut, usdgAmount);
uint256 amountOutAfterFees = _collectSwapFees(_tokenOut, amountOut, feeBasisPoints);
_increaseUsdgAmount(_tokenIn, usdgAmount);
_decreaseUsdgAmount(_tokenOut, usdgAmount);
_increasePoolAmount(_tokenIn, amountIn);
_decreasePoolAmount(_tokenOut, amountOut);
_validateBufferAmount(_tokenOut);
_transferOut(_tokenOut, amountOutAfterFees, _receiver);
emit Swap(_receiver, _tokenIn, _tokenOut, amountIn, amountOut, amountOutAfterFees, feeBasisPoints);
useSwapPricing = false;
return amountOutAfterFees;
}
function increasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external override nonReentrant {
_validate(isLeverageEnabled, 28);
_validateGasPrice();
_validateRouter(_account);
_validateTokens(_collateralToken, _indexToken, _isLong);
vaultUtils.validateIncreasePosition(_account, _collateralToken, _indexToken, _sizeDelta, _isLong);
updateCumulativeFundingRate(_collateralToken, _indexToken);
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position storage position = positions[key];
uint256 price = _isLong ? getMaxPrice(_indexToken) : getMinPrice(_indexToken);
if (position.size == 0) {
position.averagePrice = price;
}
if (position.size > 0 && _sizeDelta > 0) {
position.averagePrice = getNextAveragePrice(_indexToken, position.size, position.averagePrice, _isLong, price, _sizeDelta, position.lastIncreasedTime);
}
uint256 fee = _collectMarginFees(_account, _collateralToken, _indexToken, _isLong, _sizeDelta, position.size, position.entryFundingRate);
uint256 collateralDelta = _transferIn(_collateralToken);
uint256 collateralDeltaUsd = tokenToUsdMin(_collateralToken, collateralDelta);
position.collateral = position.collateral.add(collateralDeltaUsd);
_validate(position.collateral >= fee, 29);
position.collateral = position.collateral.sub(fee);
position.entryFundingRate = getEntryFundingRate(_collateralToken, _indexToken, _isLong);
position.size = position.size.add(_sizeDelta);
position.lastIncreasedTime = block.timestamp;
_validate(position.size > 0, 30);
_validatePosition(position.size, position.collateral);
validateLiquidation(_account, _collateralToken, _indexToken, _isLong, true);
// reserve tokens to pay profits on the position
uint256 reserveDelta = usdToTokenMax(_collateralToken, _sizeDelta);
position.reserveAmount = position.reserveAmount.add(reserveDelta);
_increaseReservedAmount(_collateralToken, reserveDelta);
if (_isLong) {
// guaranteedUsd stores the sum of (position.size - position.collateral) for all positions
// if a fee is charged on the collateral then guaranteedUsd should be increased by that fee amount
// since (position.size - position.collateral) would have increased by `fee`
_increaseGuaranteedUsd(_collateralToken, _sizeDelta.add(fee));
_decreaseGuaranteedUsd(_collateralToken, collateralDeltaUsd);
// treat the deposited collateral as part of the pool
_increasePoolAmount(_collateralToken, collateralDelta);
// fees need to be deducted from the pool since fees are deducted from position.collateral
// and collateral is treated as part of the pool
_decreasePoolAmount(_collateralToken, usdToTokenMin(_collateralToken, fee));
} else {
if (globalShortSizes[_indexToken] == 0) {
globalShortAveragePrices[_indexToken] = price;
} else {
globalShortAveragePrices[_indexToken] = getNextGlobalShortAveragePrice(_indexToken, price, _sizeDelta);
}
_increaseGlobalShortSize(_indexToken, _sizeDelta);
}
emit IncreasePosition(key, _account, _collateralToken, _indexToken, collateralDeltaUsd, _sizeDelta, _isLong, price, fee);
emit UpdatePosition(key, position.size, position.collateral, position.averagePrice, position.entryFundingRate, position.reserveAmount, position.realisedPnl, price);
}
function decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external override nonReentrant returns (uint256) {
_validateGasPrice();
_validateRouter(_account);
return _decreasePosition(_account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong, _receiver);
}
function _decreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) private returns (uint256) {
vaultUtils.validateDecreasePosition(_account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong, _receiver);
updateCumulativeFundingRate(_collateralToken, _indexToken);
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position storage position = positions[key];
_validate(position.size > 0, 31);
_validate(position.size >= _sizeDelta, 32);
_validate(position.collateral >= _collateralDelta, 33);
uint256 collateral = position.collateral;
// scrop variables to avoid stack too deep errors
{
uint256 reserveDelta = position.reserveAmount.mul(_sizeDelta).div(position.size);
position.reserveAmount = position.reserveAmount.sub(reserveDelta);
_decreaseReservedAmount(_collateralToken, reserveDelta);
}
(uint256 usdOut, uint256 usdOutAfterFee) = _reduceCollateral(_account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong);
if (position.size != _sizeDelta) {
position.entryFundingRate = getEntryFundingRate(_collateralToken, _indexToken, _isLong);
position.size = position.size.sub(_sizeDelta);
_validatePosition(position.size, position.collateral);
validateLiquidation(_account, _collateralToken, _indexToken, _isLong, true);
if (_isLong) {
_increaseGuaranteedUsd(_collateralToken, collateral.sub(position.collateral));
_decreaseGuaranteedUsd(_collateralToken, _sizeDelta);
}
uint256 price = _isLong ? getMinPrice(_indexToken) : getMaxPrice(_indexToken);
emit DecreasePosition(key, _account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong, price, usdOut.sub(usdOutAfterFee));
emit UpdatePosition(key, position.size, position.collateral, position.averagePrice, position.entryFundingRate, position.reserveAmount, position.realisedPnl, price);
} else {
if (_isLong) {
_increaseGuaranteedUsd(_collateralToken, collateral);
_decreaseGuaranteedUsd(_collateralToken, _sizeDelta);
}
uint256 price = _isLong ? getMinPrice(_indexToken) : getMaxPrice(_indexToken);
emit DecreasePosition(key, _account, _collateralToken, _indexToken, _collateralDelta, _sizeDelta, _isLong, price, usdOut.sub(usdOutAfterFee));
emit ClosePosition(key, position.size, position.collateral, position.averagePrice, position.entryFundingRate, position.reserveAmount, position.realisedPnl);
delete positions[key];
}
if (!_isLong) {
_decreaseGlobalShortSize(_indexToken, _sizeDelta);
}
if (usdOut > 0) {
if (_isLong) {
_decreasePoolAmount(_collateralToken, usdToTokenMin(_collateralToken, usdOut));
}
uint256 amountOutAfterFees = usdToTokenMin(_collateralToken, usdOutAfterFee);
_transferOut(_collateralToken, amountOutAfterFees, _receiver);
return amountOutAfterFees;
}
return 0;
}
function liquidatePosition(address _account, address _collateralToken, address _indexToken, bool _isLong, address _feeReceiver) external override nonReentrant {
if (inPrivateLiquidationMode) {
_validate(isLiquidator[msg.sender], 34);
}
// set includeAmmPrice to false to prevent manipulated liquidations
includeAmmPrice = false;
updateCumulativeFundingRate(_collateralToken, _indexToken);
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position memory position = positions[key];
_validate(position.size > 0, 35);
(uint256 liquidationState, uint256 marginFees) = validateLiquidation(_account, _collateralToken, _indexToken, _isLong, false);
_validate(liquidationState != 0, 36);
if (liquidationState == 2) {
// max leverage exceeded but there is collateral remaining after deducting losses so decreasePosition instead
_decreasePosition(_account, _collateralToken, _indexToken, 0, position.size, _isLong, _account);
includeAmmPrice = true;
return;
}
uint256 feeTokens = usdToTokenMin(_collateralToken, marginFees);
feeReserves[_collateralToken] = feeReserves[_collateralToken].add(feeTokens);
emit CollectMarginFees(_collateralToken, marginFees, feeTokens);
_decreaseReservedAmount(_collateralToken, position.reserveAmount);
if (_isLong) {
_decreaseGuaranteedUsd(_collateralToken, position.size.sub(position.collateral));
_decreasePoolAmount(_collateralToken, usdToTokenMin(_collateralToken, marginFees));
}
uint256 markPrice = _isLong ? getMinPrice(_indexToken) : getMaxPrice(_indexToken);
emit LiquidatePosition(key, _account, _collateralToken, _indexToken, _isLong, position.size, position.collateral, position.reserveAmount, position.realisedPnl, markPrice);
if (!_isLong && marginFees < position.collateral) {
uint256 remainingCollateral = position.collateral.sub(marginFees);
_increasePoolAmount(_collateralToken, usdToTokenMin(_collateralToken, remainingCollateral));
}
if (!_isLong) {
_decreaseGlobalShortSize(_indexToken, position.size);
}
delete positions[key];
// pay the fee receiver using the pool, we assume that in general the liquidated amount should be sufficient to cover
// the liquidation fees
_decreasePoolAmount(_collateralToken, usdToTokenMin(_collateralToken, liquidationFeeUsd));
_transferOut(_collateralToken, usdToTokenMin(_collateralToken, liquidationFeeUsd), _feeReceiver);
includeAmmPrice = true;
}
// validateLiquidation returns (state, fees)
function validateLiquidation(address _account, address _collateralToken, address _indexToken, bool _isLong, bool _raise) override public view returns (uint256, uint256) {
return vaultUtils.validateLiquidation(_account, _collateralToken, _indexToken, _isLong, _raise);
}
function getMaxPrice(address _token) public override view returns (uint256) {
return IVaultPriceFeed(priceFeed).getPrice(_token, true, includeAmmPrice, useSwapPricing);
}
function getMinPrice(address _token) public override view returns (uint256) {
return IVaultPriceFeed(priceFeed).getPrice(_token, false, includeAmmPrice, useSwapPricing);
}
function getRedemptionAmount(address _token, uint256 _usdgAmount) public override view returns (uint256) {
uint256 price = getMaxPrice(_token);
uint256 redemptionAmount = _usdgAmount.mul(PRICE_PRECISION).div(price);
return adjustForDecimals(redemptionAmount, usdg, _token);
}
function getRedemptionCollateral(address _token) public view returns (uint256) {
if (stableTokens[_token]) {
return poolAmounts[_token];
}
uint256 collateral = usdToTokenMin(_token, guaranteedUsd[_token]);
return collateral.add(poolAmounts[_token]).sub(reservedAmounts[_token]);
}
function getRedemptionCollateralUsd(address _token) public view returns (uint256) {
return tokenToUsdMin(_token, getRedemptionCollateral(_token));
}
function adjustForDecimals(uint256 _amount, address _tokenDiv, address _tokenMul) public view returns (uint256) {
uint256 decimalsDiv = _tokenDiv == usdg ? USDG_DECIMALS : tokenDecimals[_tokenDiv];
uint256 decimalsMul = _tokenMul == usdg ? USDG_DECIMALS : tokenDecimals[_tokenMul];
return _amount.mul(10 ** decimalsMul).div(10 ** decimalsDiv);
}
function tokenToUsdMin(address _token, uint256 _tokenAmount) public override view returns (uint256) {
if (_tokenAmount == 0) { return 0; }
uint256 price = getMinPrice(_token);
uint256 decimals = tokenDecimals[_token];
return _tokenAmount.mul(price).div(10 ** decimals);
}
function usdToTokenMax(address _token, uint256 _usdAmount) public view returns (uint256) {
if (_usdAmount == 0) { return 0; }
return usdToToken(_token, _usdAmount, getMinPrice(_token));
}
function usdToTokenMin(address _token, uint256 _usdAmount) public view returns (uint256) {
if (_usdAmount == 0) { return 0; }
return usdToToken(_token, _usdAmount, getMaxPrice(_token));
}
function usdToToken(address _token, uint256 _usdAmount, uint256 _price) public view returns (uint256) {
if (_usdAmount == 0) { return 0; }
uint256 decimals = tokenDecimals[_token];
return _usdAmount.mul(10 ** decimals).div(_price);
}
function getPosition(address _account, address _collateralToken, address _indexToken, bool _isLong) public override view returns (uint256, uint256, uint256, uint256, uint256, uint256, bool, uint256) {
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position memory position = positions[key];
uint256 realisedPnl = position.realisedPnl > 0 ? uint256(position.realisedPnl) : uint256(-position.realisedPnl);
return (
position.size, // 0
position.collateral, // 1
position.averagePrice, // 2
position.entryFundingRate, // 3
position.reserveAmount, // 4
realisedPnl, // 5
position.realisedPnl >= 0, // 6
position.lastIncreasedTime // 7
);
}
function getPositionKey(address _account, address _collateralToken, address _indexToken, bool _isLong) public pure returns (bytes32) {
return keccak256(abi.encodePacked(
_account,
_collateralToken,
_indexToken,
_isLong
));
}
function updateCumulativeFundingRate(address _collateralToken, address _indexToken) public {
bool shouldUpdate = vaultUtils.updateCumulativeFundingRate(_collateralToken, _indexToken);
if (!shouldUpdate) {
return;
}
if (lastFundingTimes[_collateralToken] == 0) {
lastFundingTimes[_collateralToken] = block.timestamp.div(fundingInterval).mul(fundingInterval);
return;
}
if (lastFundingTimes[_collateralToken].add(fundingInterval) > block.timestamp) {
return;
}
uint256 fundingRate = getNextFundingRate(_collateralToken);
cumulativeFundingRates[_collateralToken] = cumulativeFundingRates[_collateralToken].add(fundingRate);
lastFundingTimes[_collateralToken] = block.timestamp.div(fundingInterval).mul(fundingInterval);
emit UpdateFundingRate(_collateralToken, cumulativeFundingRates[_collateralToken]);
}
function getNextFundingRate(address _token) public override view returns (uint256) {
if (lastFundingTimes[_token].add(fundingInterval) > block.timestamp) { return 0; }
uint256 intervals = block.timestamp.sub(lastFundingTimes[_token]).div(fundingInterval);
uint256 poolAmount = poolAmounts[_token];
if (poolAmount == 0) { return 0; }
uint256 _fundingRateFactor = stableTokens[_token] ? stableFundingRateFactor : fundingRateFactor;
return _fundingRateFactor.mul(reservedAmounts[_token]).mul(intervals).div(poolAmount);
}
function getUtilisation(address _token) public view returns (uint256) {
uint256 poolAmount = poolAmounts[_token];
if (poolAmount == 0) { return 0; }
return reservedAmounts[_token].mul(FUNDING_RATE_PRECISION).div(poolAmount);
}
function getPositionLeverage(address _account, address _collateralToken, address _indexToken, bool _isLong) public view returns (uint256) {
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position memory position = positions[key];
_validate(position.collateral > 0, 37);
return position.size.mul(BASIS_POINTS_DIVISOR).div(position.collateral);
}
// for longs: nextAveragePrice = (nextPrice * nextSize)/ (nextSize + delta)
// for shorts: nextAveragePrice = (nextPrice * nextSize) / (nextSize - delta)
function getNextAveragePrice(address _indexToken, uint256 _size, uint256 _averagePrice, bool _isLong, uint256 _nextPrice, uint256 _sizeDelta, uint256 _lastIncreasedTime) public view returns (uint256) {
(bool hasProfit, uint256 delta) = getDelta(_indexToken, _size, _averagePrice, _isLong, _lastIncreasedTime);
uint256 nextSize = _size.add(_sizeDelta);
uint256 divisor;
if (_isLong) {
divisor = hasProfit ? nextSize.add(delta) : nextSize.sub(delta);
} else {
divisor = hasProfit ? nextSize.sub(delta) : nextSize.add(delta);
}
return _nextPrice.mul(nextSize).div(divisor);
}
// for longs: nextAveragePrice = (nextPrice * nextSize)/ (nextSize + delta)
// for shorts: nextAveragePrice = (nextPrice * nextSize) / (nextSize - delta)
function getNextGlobalShortAveragePrice(address _indexToken, uint256 _nextPrice, uint256 _sizeDelta) public view returns (uint256) {
uint256 size = globalShortSizes[_indexToken];
uint256 averagePrice = globalShortAveragePrices[_indexToken];
uint256 priceDelta = averagePrice > _nextPrice ? averagePrice.sub(_nextPrice) : _nextPrice.sub(averagePrice);
uint256 delta = size.mul(priceDelta).div(averagePrice);
bool hasProfit = averagePrice > _nextPrice;
uint256 nextSize = size.add(_sizeDelta);
uint256 divisor = hasProfit ? nextSize.sub(delta) : nextSize.add(delta);
return _nextPrice.mul(nextSize).div(divisor);
}
function getGlobalShortDelta(address _token) public view returns (bool, uint256) {
uint256 size = globalShortSizes[_token];
if (size == 0) { return (false, 0); }
uint256 nextPrice = getMaxPrice(_token);
uint256 averagePrice = globalShortAveragePrices[_token];
uint256 priceDelta = averagePrice > nextPrice ? averagePrice.sub(nextPrice) : nextPrice.sub(averagePrice);
uint256 delta = size.mul(priceDelta).div(averagePrice);
bool hasProfit = averagePrice > nextPrice;
return (hasProfit, delta);
}
function getPositionDelta(address _account, address _collateralToken, address _indexToken, bool _isLong) public view returns (bool, uint256) {
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position memory position = positions[key];
return getDelta(_indexToken, position.size, position.averagePrice, _isLong, position.lastIncreasedTime);
}
function getDelta(address _indexToken, uint256 _size, uint256 _averagePrice, bool _isLong, uint256 _lastIncreasedTime) public override view returns (bool, uint256) {
_validate(_averagePrice > 0, 38);
uint256 price = _isLong ? getMinPrice(_indexToken) : getMaxPrice(_indexToken);
uint256 priceDelta = _averagePrice > price ? _averagePrice.sub(price) : price.sub(_averagePrice);
uint256 delta = _size.mul(priceDelta).div(_averagePrice);
bool hasProfit;
if (_isLong) {
hasProfit = price > _averagePrice;
} else {
hasProfit = _averagePrice > price;
}
// if the minProfitTime has passed then there will be no min profit threshold
// the min profit threshold helps to prevent front-running issues
uint256 minBps = block.timestamp > _lastIncreasedTime.add(minProfitTime) ? 0 : minProfitBasisPoints[_indexToken];
if (hasProfit && delta.mul(BASIS_POINTS_DIVISOR) <= _size.mul(minBps)) {
delta = 0;
}
return (hasProfit, delta);
}
function getEntryFundingRate(address _collateralToken, address _indexToken, bool _isLong) public view returns (uint256) {
return vaultUtils.getEntryFundingRate(_collateralToken, _indexToken, _isLong);
}
function getFundingFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _size, uint256 _entryFundingRate) public view returns (uint256) {
return vaultUtils.getFundingFee(_account, _collateralToken, _indexToken, _isLong, _size, _entryFundingRate);
}
function getPositionFee(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _sizeDelta) public view returns (uint256) {
return vaultUtils.getPositionFee(_account, _collateralToken, _indexToken, _isLong, _sizeDelta);
}
// cases to consider
// 1. initialAmount is far from targetAmount, action increases balance slightly => high rebate
// 2. initialAmount is far from targetAmount, action increases balance largely => high rebate
// 3. initialAmount is close to targetAmount, action increases balance slightly => low rebate
// 4. initialAmount is far from targetAmount, action reduces balance slightly => high tax
// 5. initialAmount is far from targetAmount, action reduces balance largely => high tax
// 6. initialAmount is close to targetAmount, action reduces balance largely => low tax
// 7. initialAmount is above targetAmount, nextAmount is below targetAmount and vice versa
// 8. a large swap should have similar fees as the same trade split into multiple smaller swaps
function getFeeBasisPoints(address _token, uint256 _usdgDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) public override view returns (uint256) {
return vaultUtils.getFeeBasisPoints(_token, _usdgDelta, _feeBasisPoints, _taxBasisPoints, _increment);
}
function getTargetUsdgAmount(address _token) public override view returns (uint256) {
uint256 supply = IERC20(usdg).totalSupply();
if (supply == 0) { return 0; }
uint256 weight = tokenWeights[_token];
return weight.mul(supply).div(totalTokenWeights);
}
function _reduceCollateral(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong) private returns (uint256, uint256) {
bytes32 key = getPositionKey(_account, _collateralToken, _indexToken, _isLong);
Position storage position = positions[key];
uint256 fee = _collectMarginFees(_account, _collateralToken, _indexToken, _isLong, _sizeDelta, position.size, position.entryFundingRate);
bool hasProfit;
uint256 adjustedDelta;
// scope variables to avoid stack too deep errors
{
(bool _hasProfit, uint256 delta) = getDelta(_indexToken, position.size, position.averagePrice, _isLong, position.lastIncreasedTime);
hasProfit = _hasProfit;
// get the proportional change in pnl
adjustedDelta = _sizeDelta.mul(delta).div(position.size);
}
uint256 usdOut;
// transfer profits out
if (hasProfit && adjustedDelta > 0) {
usdOut = adjustedDelta;
position.realisedPnl = position.realisedPnl + int256(adjustedDelta);
// pay out realised profits from the pool amount for short positions
if (!_isLong) {
uint256 tokenAmount = usdToTokenMin(_collateralToken, adjustedDelta);
_decreasePoolAmount(_collateralToken, tokenAmount);
}
}
if (!hasProfit && adjustedDelta > 0) {
position.collateral = position.collateral.sub(adjustedDelta);
// transfer realised losses to the pool for short positions
// realised losses for long positions are not transferred here as
// _increasePoolAmount was already called in increasePosition for longs
if (!_isLong) {
uint256 tokenAmount = usdToTokenMin(_collateralToken, adjustedDelta);
_increasePoolAmount(_collateralToken, tokenAmount);
}
position.realisedPnl = position.realisedPnl - int256(adjustedDelta);
}
// reduce the position's collateral by _collateralDelta
// transfer _collateralDelta out
if (_collateralDelta > 0) {
usdOut = usdOut.add(_collateralDelta);
position.collateral = position.collateral.sub(_collateralDelta);
}
// if the position will be closed, then transfer the remaining collateral out
if (position.size == _sizeDelta) {
usdOut = usdOut.add(position.collateral);
position.collateral = 0;
}
// if the usdOut is more than the fee then deduct the fee from the usdOut directly
// else deduct the fee from the position's collateral
uint256 usdOutAfterFee = usdOut;
if (usdOut > fee) {
usdOutAfterFee = usdOut.sub(fee);
} else {
position.collateral = position.collateral.sub(fee);
if (_isLong) {
uint256 feeTokens = usdToTokenMin(_collateralToken, fee);
_decreasePoolAmount(_collateralToken, feeTokens);
}
}
emit UpdatePnl(key, hasProfit, adjustedDelta);
return (usdOut, usdOutAfterFee);
}
function _validatePosition(uint256 _size, uint256 _collateral) private view {
if (_size == 0) {
_validate(_collateral == 0, 39);
return;
}
_validate(_size >= _collateral, 40);
}
function _validateRouter(address _account) private view {
if (msg.sender == _account) { return; }
if (msg.sender == router) { return; }
_validate(approvedRouters[_account][msg.sender], 41);
}
function _validateTokens(address _collateralToken, address _indexToken, bool _isLong) private view {
if (_isLong) {
_validate(_collateralToken == _indexToken, 42);
_validate(whitelistedTokens[_collateralToken], 43);
_validate(!stableTokens[_collateralToken], 44);
return;
}
_validate(whitelistedTokens[_collateralToken], 45);
_validate(stableTokens[_collateralToken], 46);
_validate(!stableTokens[_indexToken], 47);
_validate(shortableTokens[_indexToken], 48);
}
function _collectSwapFees(address _token, uint256 _amount, uint256 _feeBasisPoints) private returns (uint256) {
uint256 afterFeeAmount = _amount.mul(BASIS_POINTS_DIVISOR.sub(_feeBasisPoints)).div(BASIS_POINTS_DIVISOR);
uint256 feeAmount = _amount.sub(afterFeeAmount);
feeReserves[_token] = feeReserves[_token].add(feeAmount);
emit CollectSwapFees(_token, tokenToUsdMin(_token, feeAmount), feeAmount);
return afterFeeAmount;
}
function _collectMarginFees(address _account, address _collateralToken, address _indexToken, bool _isLong, uint256 _sizeDelta, uint256 _size, uint256 _entryFundingRate) private returns (uint256) {
uint256 feeUsd = getPositionFee(_account, _collateralToken, _indexToken, _isLong, _sizeDelta);
uint256 fundingFee = getFundingFee(_account, _collateralToken, _indexToken, _isLong, _size, _entryFundingRate);
feeUsd = feeUsd.add(fundingFee);
uint256 feeTokens = usdToTokenMin(_collateralToken, feeUsd);
feeReserves[_collateralToken] = feeReserves[_collateralToken].add(feeTokens);
emit CollectMarginFees(_collateralToken, feeUsd, feeTokens);
return feeUsd;
}
function _transferIn(address _token) private returns (uint256) {
uint256 prevBalance = tokenBalances[_token];
uint256 nextBalance = IERC20(_token).balanceOf(address(this));
tokenBalances[_token] = nextBalance;
return nextBalance.sub(prevBalance);
}
function _transferOut(address _token, uint256 _amount, address _receiver) private {
IERC20(_token).safeTransfer(_receiver, _amount);
tokenBalances[_token] = IERC20(_token).balanceOf(address(this));
}
function _updateTokenBalance(address _token) private {
uint256 nextBalance = IERC20(_token).balanceOf(address(this));
tokenBalances[_token] = nextBalance;
}
function _increasePoolAmount(address _token, uint256 _amount) private {
poolAmounts[_token] = poolAmounts[_token].add(_amount);
uint256 balance = IERC20(_token).balanceOf(address(this));
_validate(poolAmounts[_token] <= balance, 49);
emit IncreasePoolAmount(_token, _amount);
}
function _decreasePoolAmount(address _token, uint256 _amount) private {
poolAmounts[_token] = poolAmounts[_token].sub(_amount, "Vault: poolAmount exceeded");
_validate(reservedAmounts[_token] <= poolAmounts[_token], 50);
emit DecreasePoolAmount(_token, _amount);
}
function _validateBufferAmount(address _token) private view {
if (poolAmounts[_token] < bufferAmounts[_token]) {
revert("Vault: poolAmount < buffer");
}
}
function _increaseUsdgAmount(address _token, uint256 _amount) private {
usdgAmounts[_token] = usdgAmounts[_token].add(_amount);
uint256 maxUsdgAmount = maxUsdgAmounts[_token];
if (maxUsdgAmount != 0) {
_validate(usdgAmounts[_token] <= maxUsdgAmount, 51);
}
emit IncreaseUsdgAmount(_token, _amount);
}
function _decreaseUsdgAmount(address _token, uint256 _amount) private {
uint256 value = usdgAmounts[_token];
// since USDG can be minted using multiple assets
// it is possible for the USDG debt for a single asset to be less than zero
// the USDG debt is capped to zero for this case
if (value <= _amount) {
usdgAmounts[_token] = 0;
emit DecreaseUsdgAmount(_token, value);
return;
}
usdgAmounts[_token] = value.sub(_amount);
emit DecreaseUsdgAmount(_token, _amount);
}
function _increaseReservedAmount(address _token, uint256 _amount) private {
reservedAmounts[_token] = reservedAmounts[_token].add(_amount);
_validate(reservedAmounts[_token] <= poolAmounts[_token], 52);
emit IncreaseReservedAmount(_token, _amount);
}
function _decreaseReservedAmount(address _token, uint256 _amount) private {
reservedAmounts[_token] = reservedAmounts[_token].sub(_amount, "Vault: insufficient reserve");
emit DecreaseReservedAmount(_token, _amount);
}
function _increaseGuaranteedUsd(address _token, uint256 _usdAmount) private {
guaranteedUsd[_token] = guaranteedUsd[_token].add(_usdAmount);
emit IncreaseGuaranteedUsd(_token, _usdAmount);
}
function _decreaseGuaranteedUsd(address _token, uint256 _usdAmount) private {
guaranteedUsd[_token] = guaranteedUsd[_token].sub(_usdAmount);
emit DecreaseGuaranteedUsd(_token, _usdAmount);
}
function _increaseGlobalShortSize(address _token, uint256 _amount) internal {
globalShortSizes[_token] = globalShortSizes[_token].add(_amount);
uint256 maxSize = maxGlobalShortSizes[_token];
if (maxSize != 0) {
require(globalShortSizes[_token] <= maxSize, "Vault: max shorts exceeded");
}
}
function _decreaseGlobalShortSize(address _token, uint256 _amount) private {
uint256 size = globalShortSizes[_token];
if (_amount > size) {
globalShortSizes[_token] = 0;
return;
}
globalShortSizes[_token] = size.sub(_amount);
}
// we have this validation as a function instead of a modifier to reduce contract size
function _onlyGov() private view {
_validate(msg.sender == gov, 53);
}
// we have this validation as a function instead of a modifier to reduce contract size
function _validateManager() private view {
if (inManagerMode) {
_validate(isManager[msg.sender], 54);
}
}
// we have this validation as a function instead of a modifier to reduce contract size
function _validateGasPrice() private view {
if (maxGasPrice == 0) { return; }
_validate(tx.gasprice <= maxGasPrice, 55);
}
function _validate(bool _condition, uint256 _errorCode) private view {
require(_condition, errors[_errorCode]);
}
}{
"compilationTarget": {
"Vault.sol": "Vault"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": true,
"runs": 1
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