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| // SPDX-License-Identifier: MIT
pragma solidity 0.8.16;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol";
import "@uniswap/v3-periphery/contracts/interfaces/IQuoter.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@uniswap/v3-periphery/contracts/libraries/TransferHelper.sol";
import "@openzeppelin/contracts/interfaces/IERC4626.sol";
import "./interfaces/IKeyProtocolVariables.sol";
import "./interfaces/IxTokenRouter.sol";
import "./interfaces/IOraclePrices.sol";
import "./interfaces/IxToken.sol";
contract xBasket is ERC20, IERC4626, Ownable {
IxTokenRouter public xTokenRouter;
IOraclePrices public oraclePrices;
IKeyProtocolVariables public keyProtocolValues;
address public xWheat;
address public xSoy;
address public xCorn;
address public xRice;
address public cWheat;
address public cSoy;
address public cCorn;
address public cRice;
address public usdc;
ISwapRouter public uniswapRouter;
IQuoter public quoter;
event AutoCompounded(uint256 xWheat, uint256 xSoy, uint256 xRice, uint256 xCorn);
constructor(
address _xTokenRouter,
address _oraclePrices,
address _keyProtocolValues,
address _uniswapRouter,
address _quoter
) ERC20("xBasket LandX Index Fund", "xBASKET") {
Erequire(_xTokenRouter != address(0), "zero address is not allowed");
Erequire(_oraclePrices != address(0), "zero address is not allowed");
Erequire(_keyProtocolValues != address(0), "zero address is not allowed");
Erequire(_uniswapRouter != address(0), "zero address is not allowed");
xTokenRouter = IxTokenRouter(_xTokenRouter);
oraclePrices = IOraclePrices(_oraclePrices);
keyProtocolValues = IKeyProtocolVariables(_keyProtocolValues);
xWheat = xTokenRouter.getXToken("WHEAT");
xSoy = xTokenRouter.getXToken("SOY");
xRice = xTokenRouter.getXToken("RICE");
xCorn = xTokenRouter.getXToken("CORN");
cWheat = xTokenRouter.getCToken("WHEAT");
cSoy = xTokenRouter.getCToken("SOY");
cRice = xTokenRouter.getCToken("RICE");
cCorn = xTokenRouter.getCToken("CORN");
usdc = oraclePrices.usdc();
uniswapRouter = ISwapRouter(_uniswapRouter);
quoter = IQuoter(_quoter);
}
// We have 4 underlying tokens
function asset() public view override returns (address) {
return usdc;
}
// return underlying assets amount in USDC
function totalAssets() public view override returns (uint256) {
return calculateTVL();
}
function convertToShares(uint256 assets)
public
view
override
returns (uint256)
{
return _convertToShares(assets);
}
function _convertToShares(uint256 assets)
internal
view
returns (uint256 shares)
{
uint256 usdVaultValuation = calculateTVL();
uint256 circulatingSupply = totalSupply();
if (circulatingSupply == 0) {
shares = 4 * assets; // initially 1 xBasket = 0.25 of all 4 xTokens
} else {
uint256 xWheatPrice = oraclePrices.getXTokenPrice(xWheat);
uint256 xSoyPrice = oraclePrices.getXTokenPrice(xSoy);
uint256 xRicePrice = oraclePrices.getXTokenPrice(xRice);
uint256 xCornPrice = oraclePrices.getXTokenPrice(xCorn);
shares = assets *(xWheatPrice + xSoyPrice + xCornPrice + xRicePrice) * circulatingSupply / usdVaultValuation / 1e6;
}
return shares;
}
function convertToAssets(uint256 shares)
public
view
override
returns (uint256)
{
return _convertToAssets(shares);
}
function _convertToAssets(uint256 shares) internal view returns (uint256) {
uint256 usdVaultValuation = calculateTVL();
uint256 circulatingSupply = totalSupply();
if (circulatingSupply == 0) {
return shares / 4;
}
uint256 xWheatPrice = oraclePrices.getXTokenPrice(xWheat);
uint256 xSoyPrice = oraclePrices.getXTokenPrice(xSoy);
uint256 xRicePrice = oraclePrices.getXTokenPrice(xRice);
uint256 xCornPrice = oraclePrices.getXTokenPrice(xCorn);
uint256 redeemAmount = 1e6 * shares * usdVaultValuation / circulatingSupply / (xWheatPrice + xSoyPrice + xRicePrice + xCornPrice);
return redeemAmount;
}
function maxDeposit(address receiver)
public
view
virtual
override
returns (uint256)
{
return _findMinAssetBalanceValue(receiver);
}
function maxMint(address receiver)
public
view
virtual
override
returns (uint256)
{
return _convertToShares(_findMinAssetBalanceValue(receiver));
}
function maxWithdraw(address owner)
public
view
virtual
override
returns (uint256)
{
return _convertToAssets(balanceOf(owner));
}
function maxRedeem(address owner)
public
view
virtual
override
returns (uint256)
{
return balanceOf(owner);
}
function previewDeposit(uint256 assets)
public
view
virtual
override
returns (uint256)
{
return _convertToShares(assets);
}
function previewMint(uint256 shares)
public
view
virtual
override
returns (uint256)
{
return _convertToAssets(shares);
}
function previewWithdraw(uint256 assets)
public
view
virtual
override
returns (uint256)
{
return _convertToShares(assets);
}
function previewRedeem(uint256 shares)
public
view
virtual
override
returns (uint256)
{
return _convertToAssets(shares);
}
function deposit(uint256 assets, address receiver)
public
virtual
override
returns (uint256)
{
require(
assets <= maxDeposit(msg.sender),
"ERC4626: deposit more than max"
);
uint256 shares = previewDeposit(assets);
_deposit(msg.sender, receiver, assets, shares);
return shares;
}
function mint(uint256 shares, address receiver)
public
virtual
override
returns (uint256)
{
require(shares <= maxMint(msg.sender), "ERC4626: mint more than max");
uint256 assets = previewMint(shares);
_deposit(msg.sender, receiver, assets, shares);
return assets;
}
function withdraw(
uint256 assets,
address receiver,
address owner
) public virtual override returns (uint256) {
Erequire(
assets <= maxWithdraw(owner),
"ERC4626: withdraw more than max"
);
uint256 shares = previewWithdraw(assets);
_withdraw(_msgSender(), receiver, owner, assets, shares);
return shares;
}
function redeem(
uint256 shares,
address receiver,
address owner
) public virtual override returns (uint256) {
require(shares <= maxRedeem(owner), "ERC4626: redeem more than max");
uint256 assets = previewRedeem(shares);
_withdraw(_msgSender(), receiver, owner, assets, shares);
return assets;
}
function _findMinAssetBalanceValue(address owner)
internal
view
returns (uint256)
{
uint256 xWheatBalance = IxToken(xWheat).balanceOf(owner);
uint256 xSoyBalance = IxToken(xSoy).balanceOf(owner);
uint256 xRiceBalance = IxToken(xRice).balanceOf(owner);
uint256 xCornBalance = IxToken(xCorn).balanceOf(owner);
uint256[4] memory balances = [
xWheatBalance,
xSoyBalance,
xRiceBalance,
xCornBalance
];
uint256 smallest = xWheatBalance;
uint256 i;
for (i = 0; i < balances.length; i++) {
Iif (balances[i] < smallest) {
smallest = balances[i];
}
}
return smallest;
}
function _deposit(
address caller,
address receiver,
uint256 assets,
uint256 shares
) internal {
IxToken(xWheat).xBasketTransfer(caller, assets);
IxToken(xSoy).xBasketTransfer(caller, assets);
IxToken(xRice).xBasketTransfer(caller, assets);
IxToken(xCorn).xBasketTransfer(caller, assets);
IxToken(xWheat).stake(assets);
IxToken(xSoy).stake(assets);
IxToken(xRice).stake(assets);
IxToken(xCorn).stake(assets);
_mint(receiver, shares);
emit Deposit(caller, receiver, assets, shares);
}
function _withdraw(
address caller,
address receiver,
address owner,
uint256 assets,
uint256 shares
) internal {
Iif (caller != owner) {
_spendAllowance(owner, caller, shares);
}
autoCompoundRewards();
_burn(owner, shares);
IxToken(xWheat).unstake(assets);
IxToken(xSoy).unstake(assets);
IxToken(xRice).unstake(assets);
IxToken(xCorn).unstake(assets);
IxToken(xWheat).transfer(receiver, assets);
IxToken(xSoy).transfer(receiver, assets);
IxToken(xRice).transfer(receiver, assets);
IxToken(xCorn).transfer(receiver, assets);
emit Withdraw(caller, receiver, owner, assets, shares);
}
// calculate the value of the contracts xToken holdings in USDC
function calculateCollateral() public view returns (uint256) {
// xTokens Balances
uint256 xWheatBalance = IxToken(xWheat).balanceOf(address(this));
uint256 xSoyBalance = IxToken(xSoy).balanceOf(address(this));
uint256 xRiceBalance = IxToken(xRice).balanceOf(address(this));
uint256 xCornBalance = IxToken(xCorn).balanceOf(address(this));
(uint256 xWheatStaked, ) = IxToken(xWheat).Staked(address(this));
(uint256 xSoyStaked, ) = IxToken(xSoy).Staked(address(this));
(uint256 xRiceStaked, ) = IxToken(xRice).Staked(address(this));
(uint256 xCornStaked, ) = IxToken(xCorn).Staked(address(this));
// USDC Prices - Note this assumes prices are stored in USDC with 6 decimals
uint256 xWheatPrice = oraclePrices.getXTokenPrice(xWheat);
uint256 xSoyPrice = oraclePrices.getXTokenPrice(xSoy);
uint256 xRicePrice = oraclePrices.getXTokenPrice(xRice);
uint256 xCornPrice = oraclePrices.getXTokenPrice(xCorn);
// Valutations
uint256 collateral;
collateral += (xWheatBalance + xWheatStaked) * xWheatPrice;
collateral += (xSoyBalance + xSoyStaked) * xSoyPrice;
collateral += (xRiceBalance + xRiceStaked) * xRicePrice;
collateral += (xCornBalance + xCornStaked) * xCornPrice;
collateral = collateral / 1e6; //USDC has 6 decimals
return collateral;
}
// calculate the value of the contracts cToken holdings in USDC
function calculateYield() public view returns (uint256) {
// Rewards Pending & USDC balance
uint256 cWheatPending = IxToken(xWheat).availableToClaim(address(this));
uint256 cSoyPending = IxToken(xSoy).availableToClaim(address(this));
uint256 cRicePending = IxToken(xRice).availableToClaim(address(this));
uint256 cCornPending = IxToken(xCorn).availableToClaim(address(this));
uint256 usdcBalance = IERC20(usdc).balanceOf(address(this));
// USDC Prices - Note this assumes prices are stored in USDC with 6 decimals
uint256 cWheatPrice = oraclePrices.prices("WHEAT");
uint256 cSoyPrice = oraclePrices.prices("SOY");
uint256 cRicePrice = oraclePrices.prices("RICE");
uint256 cCornPrice = oraclePrices.prices("CORN");
// Valutations
uint256 totalYield = usdcBalance;
totalYield +=
((IERC20(cWheat).balanceOf(address(this)) + cWheatPending) *
cWheatPrice) /
1e9; // cTokenparices are per megatonne, 1 cTokenPrice = 1 price per kg, so we divide by 1e9
totalYield +=
((IERC20(cSoy).balanceOf(address(this)) + cSoyPending) *
cSoyPrice) /
1e9;
totalYield +=
((IERC20(cRice).balanceOf(address(this)) + cRicePending) *
cRicePrice) /
1e9;
totalYield +=
((IERC20(cCorn).balanceOf(address(this)) + cCornPending) *
cCornPrice) /
1e9;
return totalYield;
}
// calculate the value of the contracts holdings in USDC
function calculateTVL() public view returns (uint256) {
uint256 totalCollateral = calculateCollateral();
uint256 totalYield = calculateYield();
uint256 tvl = totalCollateral + totalYield;
return tvl;
}
// calculate price per token
function pricePerToken() public view returns (uint256) {
uint256 tvl = calculateTVL();
uint256 circulatingSupply = totalSupply();
Iif (circulatingSupply == 0) {
return 0;
}
uint256 xBasketPrice = (tvl * 1e6) / circulatingSupply; // price is usdc (6 decimals) for 1 xBasket
return xBasketPrice;
}
// claim rewards, sell cTokens, buy xTokens, stake new xTokens
function autoCompoundRewards() public {
IxToken(xWheat).claim();
IxToken(xSoy).claim();
IxToken(xRice).claim();
IxToken(xCorn).claim();
uint256 cWheatBalance = IERC20(cWheat).balanceOf(address(this));
uint256 cSoyBalance = IERC20(cSoy).balanceOf(address(this));
uint256 cRiceBalance = IERC20(cRice).balanceOf(address(this));
uint256 cCornBalance = IERC20(cCorn).balanceOf(address(this));
ERC20Burnable(cWheat).burn(cWheatBalance); //Sell cWheat
_convertToXToken(xWheat); //Buy xWheat
ERC20Burnable(cSoy).burn(cSoyBalance); //Sell cSoy
_convertToXToken(xSoy); //Buy xSoy
ERC20Burnable(cRice).burn(cRiceBalance); //Sell cRice
_convertToXToken(xRice); //Buy xRice
ERC20Burnable(cCorn).burn(cCornBalance); //Sell cCorn
_convertToXToken(xCorn); //Buy xCorn
uint256 xWheatBalance = IxToken(xWheat).balanceOf(address(this));
uint256 xSoyBalance = IxToken(xSoy).balanceOf(address(this));
uint256 xRiceBalance = IxToken(xRice).balanceOf(address(this));
uint256 xCornBalance = IxToken(xCorn).balanceOf(address(this));
IxToken(xWheat).stake(xWheatBalance);
IxToken(xSoy).stake(xSoyBalance);
IxToken(xRice).stake(xRiceBalance);
IxToken(xCorn).stake(xCornBalance);
emit AutoCompounded(xWheatBalance, xSoyBalance, xRiceBalance, xCornBalance);
}
function quoteAmountOut(uint _amount, address xToken) public returns (uint) {
uint amountOut = quoter.quoteExactInputSingle(usdc, xToken, 3000, _amount, 0);
return amountOut;
}
function _convertToXToken(address xToken) internal returns (uint256) {
uint256 amountIn = IERC20(usdc).balanceOf(address(this));
uint256 slippage = keyProtocolValues.buyXTokenSlippage();
uint256 predictedAmountOut = quoteAmountOut(amountIn, xToken);
uint256 minAmountOut = predictedAmountOut * 10000 / (10000 + slippage);
TransferHelper.safeApprove(usdc, address(uniswapRouter), amountIn);
ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
.ExactInputSingleParams(
usdc,
xToken,
3000,
address(this),
block.timestamp + 15,
amountIn,
minAmountOut,
0
);
return uniswapRouter.exactInputSingle(params);
}
function renounceOwnership() public view override EonlyOwner {
revert ("can 't renounceOwnership here");
}
function decimals()
public
view
virtual
override(ERC20, IERC20Metadata)
returns (uint8)
{
return 6;
}
}
|