Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../libraries/math/SafeMath.sol";
import "../libraries/token/IERC20.sol";
import "../tokens/interfaces/IWETH.sol";
import "../libraries/token/SafeERC20.sol";
import "../libraries/utils/Address.sol";
import "../libraries/utils/ReentrancyGuard.sol";
import "./interfaces/IRouter.sol";
import "./interfaces/IVault.sol";
import "./interfaces/IOrderBook.sol";
import "./interfaces/IExecutionFee.sol";
contract OrderBook is ReentrancyGuard, IOrderBook, IExecutionFee {
using SafeMath for uint256;
using SafeERC20 for IERC20;
using Address for address payable;
uint256 public constant PRICE_PRECISION = 1e30;
uint256 public constant USDN_PRECISION = 1e18;
struct IncreaseOrder {
address account;
address purchaseToken;
uint256 purchaseTokenAmount;
address collateralToken;
address indexToken;
uint256 sizeDelta;
bool isLong;
uint256 triggerPrice;
bool triggerAboveThreshold;
uint256 executionFee;
}
struct DecreaseOrder {
address account;
address collateralToken;
uint256 collateralDelta;
address indexToken;
uint256 sizeDelta;
bool isLong;
uint256 triggerPrice;
bool triggerAboveThreshold;
uint256 executionFee;
}
struct SwapOrder {
address account;
address[] path;
uint256 amountIn;
uint256 minOut;
uint256 triggerRatio;
bool triggerAboveThreshold;
bool shouldUnwrap;
uint256 executionFee;
}
mapping (address => mapping(uint256 => IncreaseOrder)) public increaseOrders;
mapping (address => uint256) public increaseOrdersIndex;
mapping (address => mapping(uint256 => DecreaseOrder)) public decreaseOrders;
mapping (address => uint256) public decreaseOrdersIndex;
mapping (address => mapping(uint256 => SwapOrder)) public swapOrders;
mapping (address => uint256) public swapOrdersIndex;
address public gov;
address public weth;
address public usdn;
address public router;
address public vault;
uint256 public minExecutionFee;
uint256 public minPurchaseTokenAmountUsd;
bool public isInitialized = false;
event CreateIncreaseOrder(
address indexed account,
uint256 orderIndex,
address purchaseToken,
uint256 purchaseTokenAmount,
address collateralToken,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
event CancelIncreaseOrder(
address indexed account,
uint256 orderIndex,
address purchaseToken,
uint256 purchaseTokenAmount,
address collateralToken,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
event ExecuteIncreaseOrder(
address indexed account,
uint256 orderIndex,
address purchaseToken,
uint256 purchaseTokenAmount,
address collateralToken,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee,
uint256 executionPrice
);
event UpdateIncreaseOrder(
address indexed account,
uint256 orderIndex,
address collateralToken,
address indexToken,
bool isLong,
uint256 sizeDelta,
uint256 triggerPrice,
bool triggerAboveThreshold
);
event CreateDecreaseOrder(
address indexed account,
uint256 orderIndex,
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
event CancelDecreaseOrder(
address indexed account,
uint256 orderIndex,
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
event ExecuteDecreaseOrder(
address indexed account,
uint256 orderIndex,
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee,
uint256 executionPrice
);
event UpdateDecreaseOrder(
address indexed account,
uint256 orderIndex,
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold
);
event CreateSwapOrder(
address indexed account,
uint256 orderIndex,
address[] path,
uint256 amountIn,
uint256 minOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
);
event CancelSwapOrder(
address indexed account,
uint256 orderIndex,
address[] path,
uint256 amountIn,
uint256 minOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
);
event UpdateSwapOrder(
address indexed account,
uint256 ordexIndex,
address[] path,
uint256 amountIn,
uint256 minOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
);
event ExecuteSwapOrder(
address indexed account,
uint256 orderIndex,
address[] path,
uint256 amountIn,
uint256 minOut,
uint256 amountOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
);
event Initialize(
address router,
address vault,
address weth,
address usdn,
uint256 minExecutionFee,
uint256 minPurchaseTokenAmountUsd
);
event UpdateMinExecutionFee(uint256 minExecutionFee);
event UpdateMinPurchaseTokenAmountUsd(uint256 minPurchaseTokenAmountUsd);
event UpdateGov(address gov);
modifier onlyGov() {
require(msg.sender == gov, "OrderBook: forbidden");
_;
}
constructor() public {
gov = msg.sender;
}
function initialize(
address _router,
address _vault,
address _weth,
address _usdn,
uint256 _minExecutionFee,
uint256 _minPurchaseTokenAmountUsd
) external onlyGov {
require(!isInitialized, "OrderBook: already initialized");
isInitialized = true;
router = _router;
vault = _vault;
weth = _weth;
usdn = _usdn;
minExecutionFee = _minExecutionFee;
minPurchaseTokenAmountUsd = _minPurchaseTokenAmountUsd;
emit Initialize(_router, _vault, _weth, _usdn, _minExecutionFee, _minPurchaseTokenAmountUsd);
}
receive() external payable {
require(msg.sender == weth, "OrderBook: invalid sender");
}
function setMinExecutionFee(uint256 _minExecutionFee) override external onlyGov {
minExecutionFee = _minExecutionFee;
emit UpdateMinExecutionFee(_minExecutionFee);
}
function setMinPurchaseTokenAmountUsd(uint256 _minPurchaseTokenAmountUsd) external onlyGov {
minPurchaseTokenAmountUsd = _minPurchaseTokenAmountUsd;
emit UpdateMinPurchaseTokenAmountUsd(_minPurchaseTokenAmountUsd);
}
function setGov(address _gov) external onlyGov {
gov = _gov;
emit UpdateGov(_gov);
}
function getSwapOrder(address _account, uint256 _orderIndex) override public view returns (
address path0,
address path1,
address path2,
uint256 amountIn,
uint256 minOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
) {
SwapOrder memory order = swapOrders[_account][_orderIndex];
return (
order.path.length > 0 ? order.path[0] : address(0),
order.path.length > 1 ? order.path[1] : address(0),
order.path.length > 2 ? order.path[2] : address(0),
order.amountIn,
order.minOut,
order.triggerRatio,
order.triggerAboveThreshold,
order.shouldUnwrap,
order.executionFee
);
}
function createSwapOrder(
address[] memory _path,
uint256 _amountIn,
uint256 _minOut,
uint256 _triggerRatio, // tokenB / tokenA
bool _triggerAboveThreshold,
uint256 _executionFee,
bool _shouldWrap,
bool _shouldUnwrap
) external payable nonReentrant {
require(_path.length == 2 || _path.length == 3, "OrderBook: invalid _path.length");
require(_path[0] != _path[_path.length - 1], "OrderBook: invalid _path");
require(_amountIn > 0, "OrderBook: invalid _amountIn");
require(_executionFee >= minExecutionFee, "OrderBook: insufficient execution fee");
// always need this call because of mandatory executionFee user has to transfer in ETH
_transferInETH();
if (_shouldWrap) {
require(_path[0] == weth, "OrderBook: only weth could be wrapped");
require(msg.value == _executionFee.add(_amountIn), "OrderBook: incorrect value transferred");
} else {
require(msg.value == _executionFee, "OrderBook: incorrect execution fee transferred");
IRouter(router).pluginTransfer(_path[0], msg.sender, address(this), _amountIn);
}
_createSwapOrder(msg.sender, _path, _amountIn, _minOut, _triggerRatio, _triggerAboveThreshold, _shouldUnwrap, _executionFee);
}
function _createSwapOrder(
address _account,
address[] memory _path,
uint256 _amountIn,
uint256 _minOut,
uint256 _triggerRatio,
bool _triggerAboveThreshold,
bool _shouldUnwrap,
uint256 _executionFee
) private {
uint256 _orderIndex = swapOrdersIndex[_account];
SwapOrder memory order = SwapOrder(
_account,
_path,
_amountIn,
_minOut,
_triggerRatio,
_triggerAboveThreshold,
_shouldUnwrap,
_executionFee
);
swapOrdersIndex[_account] = _orderIndex.add(1);
swapOrders[_account][_orderIndex] = order;
emit CreateSwapOrder(
_account,
_orderIndex,
_path,
_amountIn,
_minOut,
_triggerRatio,
_triggerAboveThreshold,
_shouldUnwrap,
_executionFee
);
}
function cancelMultiple(
uint256[] memory _swapOrderIndexes,
uint256[] memory _increaseOrderIndexes,
uint256[] memory _decreaseOrderIndexes
) external {
for (uint256 i = 0; i < _swapOrderIndexes.length; i++) {
cancelSwapOrder(_swapOrderIndexes[i]);
}
for (uint256 i = 0; i < _increaseOrderIndexes.length; i++) {
cancelIncreaseOrder(_increaseOrderIndexes[i]);
}
for (uint256 i = 0; i < _decreaseOrderIndexes.length; i++) {
cancelDecreaseOrder(_decreaseOrderIndexes[i]);
}
}
function cancelSwapOrder(uint256 _orderIndex) public nonReentrant {
SwapOrder memory order = swapOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
delete swapOrders[msg.sender][_orderIndex];
if (order.path[0] == weth) {
_transferOutETH(order.executionFee.add(order.amountIn), msg.sender);
} else {
IERC20(order.path[0]).safeTransfer(msg.sender, order.amountIn);
_transferOutETH(order.executionFee, msg.sender);
}
emit CancelSwapOrder(
msg.sender,
_orderIndex,
order.path,
order.amountIn,
order.minOut,
order.triggerRatio,
order.triggerAboveThreshold,
order.shouldUnwrap,
order.executionFee
);
}
function getUsdnMinPrice(address _otherToken) public view returns (uint256) {
// USDN_PRECISION is the same as 1 USDN
uint256 redemptionAmount = IVault(vault).getRedemptionAmount(_otherToken, USDN_PRECISION);
uint256 otherTokenPrice = IVault(vault).getMinPrice(_otherToken);
uint256 otherTokenDecimals = IVault(vault).tokenDecimals(_otherToken);
return redemptionAmount.mul(otherTokenPrice).div(10 ** otherTokenDecimals);
}
function validateSwapOrderPriceWithTriggerAboveThreshold(
address[] memory _path,
uint256 _triggerRatio
) public view returns (bool) {
require(_path.length == 2 || _path.length == 3, "OrderBook: invalid _path.length");
// limit orders don't need this validation because minOut is enough
// so this validation handles scenarios for stop orders only
// when a user wants to swap when a price of tokenB increases relative to tokenA
address tokenA = _path[0];
address tokenB = _path[_path.length - 1];
uint256 tokenAPrice;
uint256 tokenBPrice;
// 1. USDN doesn't have a price feed so we need to calculate it based on redepmtion amount of a specific token
// That's why USDN price in USD can vary depending on the redepmtion token
// 2. In complex scenarios with path=[USDN, BNB, BTC] we need to know how much BNB we'll get for provided USDN
// to know how much BTC will be received
// That's why in such scenario BNB should be used to determine price of USDN
if (tokenA == usdn) {
// with both _path.length == 2 or 3 we need usdn price against _path[1]
tokenAPrice = getUsdnMinPrice(_path[1]);
} else {
tokenAPrice = IVault(vault).getMinPrice(tokenA);
}
if (tokenB == usdn) {
tokenBPrice = PRICE_PRECISION;
} else {
tokenBPrice = IVault(vault).getMaxPrice(tokenB);
}
uint256 currentRatio = tokenBPrice.mul(PRICE_PRECISION).div(tokenAPrice);
bool isValid = currentRatio > _triggerRatio;
return isValid;
}
function updateSwapOrder(uint256 _orderIndex, uint256 _minOut, uint256 _triggerRatio, bool _triggerAboveThreshold) external nonReentrant {
SwapOrder storage order = swapOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
order.minOut = _minOut;
order.triggerRatio = _triggerRatio;
order.triggerAboveThreshold = _triggerAboveThreshold;
emit UpdateSwapOrder(
msg.sender,
_orderIndex,
order.path,
order.amountIn,
_minOut,
_triggerRatio,
_triggerAboveThreshold,
order.shouldUnwrap,
order.executionFee
);
}
function executeSwapOrder(address _account, uint256 _orderIndex, address payable _feeReceiver) override external nonReentrant {
SwapOrder memory order = swapOrders[_account][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
if (order.triggerAboveThreshold) {
// gas optimisation
// order.minAmount should prevent wrong price execution in case of simple limit order
require(
validateSwapOrderPriceWithTriggerAboveThreshold(order.path, order.triggerRatio),
"OrderBook: invalid price for execution"
);
}
delete swapOrders[_account][_orderIndex];
IERC20(order.path[0]).safeTransfer(vault, order.amountIn);
uint256 _amountOut;
if (order.path[order.path.length - 1] == weth && order.shouldUnwrap) {
_amountOut = _swap(order.path, order.minOut, address(this));
_transferOutETH(_amountOut, payable(order.account));
} else {
_amountOut = _swap(order.path, order.minOut, order.account);
}
// pay executor
_transferOutETH(order.executionFee, _feeReceiver);
emit ExecuteSwapOrder(
_account,
_orderIndex,
order.path,
order.amountIn,
order.minOut,
_amountOut,
order.triggerRatio,
order.triggerAboveThreshold,
order.shouldUnwrap,
order.executionFee
);
}
function validatePositionOrderPrice(
bool _triggerAboveThreshold,
uint256 _triggerPrice,
address _indexToken,
bool _maximizePrice,
bool _raise
) public view returns (uint256, bool) {
uint256 currentPrice = _maximizePrice
? IVault(vault).getMaxPrice(_indexToken) : IVault(vault).getMinPrice(_indexToken);
bool isPriceValid = _triggerAboveThreshold ? currentPrice > _triggerPrice : currentPrice < _triggerPrice;
if (_raise) {
require(isPriceValid, "OrderBook: invalid price for execution");
}
return (currentPrice, isPriceValid);
}
function getDecreaseOrder(address _account, uint256 _orderIndex) override public view returns (
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
) {
DecreaseOrder memory order = decreaseOrders[_account][_orderIndex];
return (
order.collateralToken,
order.collateralDelta,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee
);
}
function getIncreaseOrder(address _account, uint256 _orderIndex) override public view returns (
address purchaseToken,
uint256 purchaseTokenAmount,
address collateralToken,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
) {
IncreaseOrder memory order = increaseOrders[_account][_orderIndex];
return (
order.purchaseToken,
order.purchaseTokenAmount,
order.collateralToken,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee
);
}
function createIncreaseOrder(
address[] memory _path,
uint256 _amountIn,
address _indexToken,
uint256 _minOut,
uint256 _sizeDelta,
address _collateralToken,
bool _isLong,
uint256 _triggerPrice,
bool _triggerAboveThreshold,
uint256 _executionFee,
bool _shouldWrap
) external payable nonReentrant {
// always need this call because of mandatory executionFee user has to transfer in ETH
_transferInETH();
require(_executionFee >= minExecutionFee, "OrderBook: insufficient execution fee");
if (_shouldWrap) {
require(_path[0] == weth, "OrderBook: only weth could be wrapped");
require(msg.value == _executionFee.add(_amountIn), "OrderBook: incorrect value transferred");
} else {
require(msg.value == _executionFee, "OrderBook: incorrect execution fee transferred");
IRouter(router).pluginTransfer(_path[0], msg.sender, address(this), _amountIn);
}
address _purchaseToken = _path[_path.length - 1];
uint256 _purchaseTokenAmount;
if (_path.length > 1) {
require(_path[0] != _purchaseToken, "OrderBook: invalid _path");
IERC20(_path[0]).safeTransfer(vault, _amountIn);
_purchaseTokenAmount = _swap(_path, _minOut, address(this));
} else {
_purchaseTokenAmount = _amountIn;
}
{
uint256 _purchaseTokenAmountUsd = IVault(vault).tokenToUsdMin(_purchaseToken, _purchaseTokenAmount);
require(_purchaseTokenAmountUsd >= minPurchaseTokenAmountUsd, "OrderBook: insufficient collateral");
}
_createIncreaseOrder(
msg.sender,
_purchaseToken,
_purchaseTokenAmount,
_collateralToken,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold,
_executionFee
);
}
function _createIncreaseOrder(
address _account,
address _purchaseToken,
uint256 _purchaseTokenAmount,
address _collateralToken,
address _indexToken,
uint256 _sizeDelta,
bool _isLong,
uint256 _triggerPrice,
bool _triggerAboveThreshold,
uint256 _executionFee
) private {
uint256 _orderIndex = increaseOrdersIndex[msg.sender];
IncreaseOrder memory order = IncreaseOrder(
_account,
_purchaseToken,
_purchaseTokenAmount,
_collateralToken,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold,
_executionFee
);
increaseOrdersIndex[_account] = _orderIndex.add(1);
increaseOrders[_account][_orderIndex] = order;
emit CreateIncreaseOrder(
_account,
_orderIndex,
_purchaseToken,
_purchaseTokenAmount,
_collateralToken,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold,
_executionFee
);
}
function updateIncreaseOrder(uint256 _orderIndex, uint256 _sizeDelta, uint256 _triggerPrice, bool _triggerAboveThreshold) external nonReentrant {
IncreaseOrder storage order = increaseOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
order.triggerPrice = _triggerPrice;
order.triggerAboveThreshold = _triggerAboveThreshold;
order.sizeDelta = _sizeDelta;
emit UpdateIncreaseOrder(
msg.sender,
_orderIndex,
order.collateralToken,
order.indexToken,
order.isLong,
_sizeDelta,
_triggerPrice,
_triggerAboveThreshold
);
}
function cancelIncreaseOrder(uint256 _orderIndex) public nonReentrant {
IncreaseOrder memory order = increaseOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
delete increaseOrders[msg.sender][_orderIndex];
if (order.purchaseToken == weth) {
_transferOutETH(order.executionFee.add(order.purchaseTokenAmount), msg.sender);
} else {
IERC20(order.purchaseToken).safeTransfer(msg.sender, order.purchaseTokenAmount);
_transferOutETH(order.executionFee, msg.sender);
}
emit CancelIncreaseOrder(
order.account,
_orderIndex,
order.purchaseToken,
order.purchaseTokenAmount,
order.collateralToken,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee
);
}
function executeIncreaseOrder(address _address, uint256 _orderIndex, address payable _feeReceiver) override external nonReentrant {
IncreaseOrder memory order = increaseOrders[_address][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
// increase long should use max price
// increase short should use min price
(uint256 currentPrice, ) = validatePositionOrderPrice(
order.triggerAboveThreshold,
order.triggerPrice,
order.indexToken,
order.isLong,
true
);
delete increaseOrders[_address][_orderIndex];
IERC20(order.purchaseToken).safeTransfer(vault, order.purchaseTokenAmount);
if (order.purchaseToken != order.collateralToken) {
address[] memory path = new address[](2);
path[0] = order.purchaseToken;
path[1] = order.collateralToken;
uint256 amountOut = _swap(path, 0, address(this));
IERC20(order.collateralToken).safeTransfer(vault, amountOut);
}
IRouter(router).pluginIncreasePosition(order.account, order.collateralToken, order.indexToken, order.sizeDelta, order.isLong);
// pay executor
_transferOutETH(order.executionFee, _feeReceiver);
emit ExecuteIncreaseOrder(
order.account,
_orderIndex,
order.purchaseToken,
order.purchaseTokenAmount,
order.collateralToken,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee,
currentPrice
);
}
function createDecreaseOrder(
address _indexToken,
uint256 _sizeDelta,
address _collateralToken,
uint256 _collateralDelta,
bool _isLong,
uint256 _triggerPrice,
bool _triggerAboveThreshold
) external payable nonReentrant {
_transferInETH();
require(msg.value > minExecutionFee, "OrderBook: insufficient execution fee");
_createDecreaseOrder(
msg.sender,
_collateralToken,
_collateralDelta,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold
);
}
function _createDecreaseOrder(
address _account,
address _collateralToken,
uint256 _collateralDelta,
address _indexToken,
uint256 _sizeDelta,
bool _isLong,
uint256 _triggerPrice,
bool _triggerAboveThreshold
) private {
uint256 _orderIndex = decreaseOrdersIndex[_account];
DecreaseOrder memory order = DecreaseOrder(
_account,
_collateralToken,
_collateralDelta,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold,
msg.value
);
decreaseOrdersIndex[_account] = _orderIndex.add(1);
decreaseOrders[_account][_orderIndex] = order;
emit CreateDecreaseOrder(
_account,
_orderIndex,
_collateralToken,
_collateralDelta,
_indexToken,
_sizeDelta,
_isLong,
_triggerPrice,
_triggerAboveThreshold,
msg.value
);
}
function executeDecreaseOrder(address _address, uint256 _orderIndex, address payable _feeReceiver) override external nonReentrant {
DecreaseOrder memory order = decreaseOrders[_address][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
// decrease long should use min price
// decrease short should use max price
(uint256 currentPrice, ) = validatePositionOrderPrice(
order.triggerAboveThreshold,
order.triggerPrice,
order.indexToken,
!order.isLong,
true
);
delete decreaseOrders[_address][_orderIndex];
uint256 amountOut = IRouter(router).pluginDecreasePosition(
order.account,
order.collateralToken,
order.indexToken,
order.collateralDelta,
order.sizeDelta,
order.isLong,
address(this)
);
// transfer released collateral to user
if (order.collateralToken == weth) {
_transferOutETH(amountOut, payable(order.account));
} else {
IERC20(order.collateralToken).safeTransfer(order.account, amountOut);
}
// pay executor
_transferOutETH(order.executionFee, _feeReceiver);
emit ExecuteDecreaseOrder(
order.account,
_orderIndex,
order.collateralToken,
order.collateralDelta,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee,
currentPrice
);
}
function cancelDecreaseOrder(uint256 _orderIndex) public nonReentrant {
DecreaseOrder memory order = decreaseOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
delete decreaseOrders[msg.sender][_orderIndex];
_transferOutETH(order.executionFee, msg.sender);
emit CancelDecreaseOrder(
order.account,
_orderIndex,
order.collateralToken,
order.collateralDelta,
order.indexToken,
order.sizeDelta,
order.isLong,
order.triggerPrice,
order.triggerAboveThreshold,
order.executionFee
);
}
function updateDecreaseOrder(
uint256 _orderIndex,
uint256 _collateralDelta,
uint256 _sizeDelta,
uint256 _triggerPrice,
bool _triggerAboveThreshold
) external nonReentrant {
DecreaseOrder storage order = decreaseOrders[msg.sender][_orderIndex];
require(order.account != address(0), "OrderBook: non-existent order");
order.triggerPrice = _triggerPrice;
order.triggerAboveThreshold = _triggerAboveThreshold;
order.sizeDelta = _sizeDelta;
order.collateralDelta = _collateralDelta;
emit UpdateDecreaseOrder(
msg.sender,
_orderIndex,
order.collateralToken,
_collateralDelta,
order.indexToken,
_sizeDelta,
order.isLong,
_triggerPrice,
_triggerAboveThreshold
);
}
function _transferInETH() private {
if (msg.value != 0) {
IWETH(weth).deposit{value: msg.value}();
}
}
function _transferOutETH(uint256 _amountOut, address payable _receiver) private {
IWETH(weth).withdraw(_amountOut);
_receiver.sendValue(_amountOut);
}
function _swap(address[] memory _path, uint256 _minOut, address _receiver) private returns (uint256) {
if (_path.length == 2) {
return _vaultSwap(_path[0], _path[1], _minOut, _receiver);
}
if (_path.length == 3) {
uint256 midOut = _vaultSwap(_path[0], _path[1], 0, address(this));
IERC20(_path[1]).safeTransfer(vault, midOut);
return _vaultSwap(_path[1], _path[2], _minOut, _receiver);
}
revert("OrderBook: invalid _path.length");
}
function _vaultSwap(address _tokenIn, address _tokenOut, uint256 _minOut, address _receiver) private returns (uint256) {
uint256 amountOut;
if (_tokenOut == usdn) { // buyUSDN
amountOut = IVault(vault).buyUSDN(_tokenIn, _receiver);
} else if (_tokenIn == usdn) { // sellUSDN
amountOut = IVault(vault).sellUSDN(_tokenOut, _receiver);
} else { // swap
amountOut = IVault(vault).swap(_tokenIn, _tokenOut, _receiver);
}
require(amountOut >= _minOut, "OrderBook: insufficient amountOut");
return amountOut;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
interface IExecutionFee {
function setMinExecutionFee(uint256 _minExecutionFee) external;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
interface IOrderBook {
function getSwapOrder(address _account, uint256 _orderIndex) external view returns (
address path0,
address path1,
address path2,
uint256 amountIn,
uint256 minOut,
uint256 triggerRatio,
bool triggerAboveThreshold,
bool shouldUnwrap,
uint256 executionFee
);
function getIncreaseOrder(address _account, uint256 _orderIndex) external view returns (
address purchaseToken,
uint256 purchaseTokenAmount,
address collateralToken,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
function getDecreaseOrder(address _account, uint256 _orderIndex) external view returns (
address collateralToken,
uint256 collateralDelta,
address indexToken,
uint256 sizeDelta,
bool isLong,
uint256 triggerPrice,
bool triggerAboveThreshold,
uint256 executionFee
);
function executeSwapOrder(address, uint256, address payable) external;
function executeDecreaseOrder(address, uint256, address payable) external;
function executeIncreaseOrder(address, uint256, address payable) external;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
interface IRouter {
function addPlugin(address _plugin) external;
function pluginTransfer(address _token, address _account, address _receiver, uint256 _amount) external;
function pluginIncreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _sizeDelta, bool _isLong) external;
function pluginDecreasePosition(address _account, address _collateralToken, address _indexToken, uint256 _collateralDelta, uint256 _sizeDelta, bool _isLong, address _receiver) external returns (uint256);
function swap(address[] memory _path, uint256 _amountIn, uint256 _minOut, address _receiver) external;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
import "./IVaultUtils.sol";
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 usdn() 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 getTargetUsdnAmount(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 setUsdnAmount(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 _maxUsdnAmount,
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 buyUSDN(address _token, address _receiver) external returns (uint256);
function sellUSDN(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 _usdnDelta, 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 usdnAmounts(address _token) external view returns (uint256);
function maxUsdnAmounts(address _token) external view returns (uint256);
function getRedemptionAmount(address _token, uint256 _usdnAmount) 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);
}
// SPDX-License-Identifier: MIT
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 getBuyUsdnFeeBasisPoints(address _token, uint256 _usdnAmount) external view returns (uint256);
function getSellUsdnFeeBasisPoints(address _token, uint256 _usdnAmount) external view returns (uint256);
function getSwapFeeBasisPoints(address _tokenIn, address _tokenOut, uint256 _usdnAmount) external view returns (uint256);
function getFeeBasisPoints(address _token, uint256 _usdnDelta, uint256 _feeBasisPoints, uint256 _taxBasisPoints, bool _increment) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
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;
}
}
// 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);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
import "./IERC20.sol";
import "../math/SafeMath.sol";
import "../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies 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);
}
}
}
}
// SPDX-License-Identifier: MIT
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;
}
}
//SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
interface IWETH {
function deposit() external payable;
function transfer(address to, uint value) external returns (bool);
function withdraw(uint) external;
}