Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- FuseStakingV3
- Optimization enabled
- true
- Compiler version
- v0.6.12+commit.27d51765
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2021-03-03T08:19:16.780306Z
Contract source code
// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts-upgradeable/proxy/Initializable.sol
// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <0.8.0;
/**
* @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
* behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
* external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
* function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
*
* TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
* possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
*
* CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
* that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
*/
abstract contract Initializable {
/**
* @dev Indicates that the contract has been initialized.
*/
bool private _initialized;
/**
* @dev Indicates that the contract is in the process of being initialized.
*/
bool private _initializing;
/**
* @dev Modifier to protect an initializer function from being invoked twice.
*/
modifier initializer() {
require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");
bool isTopLevelCall = !_initializing;
if (isTopLevelCall) {
_initializing = true;
_initialized = true;
}
_;
if (isTopLevelCall) {
_initializing = false;
}
}
/// @dev Returns true if and only if the function is running in the constructor
function _isConstructor() private view returns (bool) {
// extcodesize checks the size of the code stored in an address, and
// address returns the current address. Since the code is still not
// deployed when running a constructor, any checks on its code size will
// yield zero, making it an effective way to detect if a contract is
// under construction or not.
address self = address(this);
uint256 cs;
// solhint-disable-next-line no-inline-assembly
assembly { cs := extcodesize(self) }
return cs == 0;
}
}
// File: @openzeppelin/contracts-upgradeable/GSN/ContextUpgradeable.sol
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract ContextUpgradeable is Initializable {
function __Context_init() internal initializer {
__Context_init_unchained();
}
function __Context_init_unchained() internal initializer {
}
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
uint256[50] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
function __Ownable_init() internal initializer {
__Context_init_unchained();
__Ownable_init_unchained();
}
function __Ownable_init_unchained() internal initializer {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
uint256[49] private __gap;
}
// File: @openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol
/**
* @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 SafeMathUpgradeable {
/**
* @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/utils/DSMath.sol
/// math.sol -- mixin for inline numerical wizardry
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
contract DSMath {
function WAD() internal pure returns (uint256) {
return 10**18;
}
function RAY() internal pure returns (uint256) {
return 10**27;
}
function add(uint256 x, uint256 y) public pure returns (uint256 z) {
require((z = x + y) >= x, "ds-math-add-overflow");
}
function sub(uint256 x, uint256 y) public pure returns (uint256 z) {
require((z = x - y) <= x, "ds-math-sub-underflow");
}
function mul(uint256 x, uint256 y) public pure returns (uint256 z) {
require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
}
function min(uint256 x, uint256 y) public pure returns (uint256 z) {
return x <= y ? x : y;
}
function max(uint256 x, uint256 y) public pure returns (uint256 z) {
return x >= y ? x : y;
}
function imin(int256 x, int256 y) public pure returns (int256 z) {
return x <= y ? x : y;
}
function imax(int256 x, int256 y) public pure returns (int256 z) {
return x >= y ? x : y;
}
function wmul(uint256 x, uint256 y) public pure returns (uint256 z) {
z = add(mul(x, y), WAD() / 2) / WAD();
}
function rmul(uint256 x, uint256 y) public pure returns (uint256 z) {
z = add(mul(x, y), RAY() / 2) / RAY();
}
function wdiv(uint256 x, uint256 y) public pure returns (uint256 z) {
z = add(mul(x, WAD()), y / 2) / y;
}
function rdiv(uint256 x, uint256 y) public pure returns (uint256 z) {
z = add(mul(x, RAY()), y / 2) / y;
}
// This famous algorithm is called "exponentiation by squaring"
// and calculates x^n with x as fixed-point and n as regular unsigned.
//
// It's O(log n), instead of O(n) for naive repeated multiplication.
//
// These facts are why it works:
//
// If n is even, then x^n = (x^2)^(n/2).
// If n is odd, then x^n = x * x^(n-1),
// and applying the equation for even x gives
// x^n = x * (x^2)^((n-1) / 2).
//
// Also, EVM division is flooring and
// floor[(n-1) / 2] = floor[n / 2].
//
function rpow(uint256 x, uint256 n) public pure returns (uint256 z) {
z = n % 2 != 0 ? x : RAY();
for (n /= 2; n != 0; n /= 2) {
x = rmul(x, x);
if (n % 2 != 0) {
z = rmul(z, x);
}
}
}
}
// File: contracts/Interfaces.sol
pragma experimental ABIEncoderV2;
interface cERC20 {
function mint(uint256 mintAmount) external returns (uint256);
function redeemUnderlying(uint256 mintAmount) external returns (uint256);
function exchangeRateCurrent() external returns (uint256);
function exchangeRateStored() external view returns (uint256);
function balanceOf(address addr) external view returns (uint256);
function transfer(address to, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);
}
interface GoodDollar is cERC20 {
function getFees(uint256 value) external view returns (uint256, bool);
function mint(address to, uint256 mintAmount) external returns (uint256);
}
interface Staking {
struct Staker {
// The staked DAI amount
uint256 stakedDAI;
// The latest block number which the
// staker has staked tokens
uint256 lastStake;
}
function stakeDAI(uint256 amount) external;
function withdrawStake() external;
function stakers(address staker) external view returns (Staker memory);
}
interface Uniswap {
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function WETH() external pure returns (address);
function factory() external pure returns (address);
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountOut(
uint256 amountI,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
}
interface UniswapFactory {
function getPair(address tokenA, address tokenB)
external
view
returns (address);
}
interface UniswapPair {
function getReserves()
external
view
returns (
uint112 reserve0,
uint112 reserve1,
uint32 blockTimestampLast
);
function kLast() external view returns (uint256);
}
interface Reserve {
function buy(
address _buyWith,
uint256 _tokenAmount,
uint256 _minReturn
) external returns (uint256);
}
interface IIdentity {
function isWhitelisted(address user) external view returns (bool);
function addWhitelistedWithDID(address account, string memory did) external;
function removeWhitelisted(address account) external;
function addIdentityAdmin(address account) external returns (bool);
function setAvatar(address _avatar) external;
}
interface UBIScheme {
function currentDay() external view returns (uint256);
}
interface ProxyAdmin {
function getProxyImplementation(address proxy)
external
view
returns (address);
function getProxyAdmin(address proxy) external view returns (address);
function upgrade(address proxy, address implementation) external;
function owner() external view returns (address);
function transferOwnership(address newOwner) external;
}
// File: contracts/staking/FuseStakingV3.sol
interface IConsensus {
/**
* @dev delegate to a validator
* @param _validator the address of the validator msg.sender is delegating to
*/
function delegate(address _validator) external payable;
/**
* @dev Function to be called when a delegator whishes to withdraw some of his staked funds for a validator
* @param _validator the address of the validator msg.sender has delegating to
* @param _amount the amount msg.sender wishes to withdraw from the contract
*/
function withdraw(address _validator, uint256 _amount) external;
function delegatedAmount(address _address, address _validator)
external
view
returns (uint256);
function stakeAmount(address _address) external view returns (uint256);
function delegators(address _validator)
external
view
returns (address[] memory);
}
contract FuseStakingV3 is Initializable, OwnableUpgradeable, DSMath {
using SafeMathUpgradeable for uint256;
mapping(address => uint256) public stakers;
address[] public validators;
IConsensus public consensus;
Uniswap public uniswap;
GoodDollar public GD;
UBIScheme public ubischeme;
UniswapFactory public uniswapFactory;
UniswapPair public uniswapPair;
uint256 public lastDayCollected; //ubi day from ubischeme
uint256 public stakeBackRatio;
uint256 public maxSlippageRatio;
uint256 public keeperFeeRatio;
uint256 public RATIO_BASE;
uint256 public communityPoolRatio; //out of G$ bought how much should goto pool
uint256 communityPoolBalance;
uint256 pendingFuseEarnings; //earnings not used because of slippage
event UBICollected(
uint256 indexed currentDay,
uint256 ubi, //G$ sent to ubischeme
uint256 communityPool, //G$ added to pool
uint256 gdBought, //actual G$ we got out of swapping stakingRewards + pendingFuseEarnings
uint256 stakingRewards, //rewards earned since previous collection,
uint256 pendingFuseEarnings, //new balance of fuse pending to be swapped for G$
address keeper,
uint256 keeperGDFee
);
/**
* @dev initialize
*/
function initialize() public initializer {
__Ownable_init_unchained();
consensus = IConsensus(
address(0x3014ca10b91cb3D0AD85fEf7A3Cb95BCAc9c0f79)
);
validators.push(address(0xcb876A393F05a6677a8a029f1C6D7603B416C0A6));
}
function upgrade0() public {
if (RATIO_BASE == 0) {
stakeBackRatio = 33333; //%33
communityPoolRatio = 33333; //%33
maxSlippageRatio = 3000; //3%
keeperFeeRatio = 30; //0.03%
RATIO_BASE = 100000; //100%
}
}
function upgrade1(
address _gd,
address _ubischeme,
address _uniswap
) public {
if (address(uniswapPair) == address(0)) {
uniswap = Uniswap(
_uniswap == address(0)
? 0xFB76e9E7d88E308aB530330eD90e84a952570319
: _uniswap
);
GD = GoodDollar(_gd);
ubischeme = UBIScheme(_ubischeme);
uniswapFactory = UniswapFactory(uniswap.factory());
uniswapPair = UniswapPair(
uniswapFactory.getPair(uniswap.WETH(), _gd)
);
upgrade0();
}
}
function setContracts(address _gd, address _ubischeme) public onlyOwner {
if (_gd != address(0)) {
GD = GoodDollar(_gd);
}
if (_ubischeme != address(0)) {
ubischeme = UBIScheme(_ubischeme);
}
}
function stake() public payable returns (bool) {
return stake(address(0));
}
function stake(address _validator) public payable returns (bool) {
require(msg.value > 0, "stake must be > 0");
require(validators.length > 0, "no approved validators");
bool found;
for (
uint256 i = 0;
_validator != address(0) && i < validators.length;
i++
) {
if (validators[i] != _validator) {
found = true;
break;
}
}
require(
_validator == address(0) || found,
"validator not in approved list"
);
bool staked = stakeNextValidator(msg.value, _validator);
stakers[msg.sender] = stakers[msg.sender].add(msg.value);
return staked;
}
function balanceOf(address _owner) public view returns (uint256) {
return stakers[_owner];
}
function withdraw(uint256 _value) public returns (uint256) {
uint256 effectiveBalance = balance(); //use only undelegated funds
uint256 toWithdraw = _value == 0 ? stakers[msg.sender] : _value;
uint256 toCollect = toWithdraw;
require(
toWithdraw > 0 && toWithdraw <= stakers[msg.sender],
"invalid withdraw amount"
);
uint256 perValidator = _value.div(validators.length);
for (uint256 i = 0; i < validators.length; i++) {
uint256 cur =
consensus.delegatedAmount(address(this), validators[i]);
if (cur == 0) continue;
if (cur <= perValidator) {
undelegateWithCatch(validators[i], cur);
toCollect = toCollect.sub(cur);
} else {
undelegateWithCatch(validators[i], perValidator);
toCollect = toCollect.sub(perValidator);
}
if (toCollect == 0) break;
}
effectiveBalance = balance().sub(effectiveBalance); //use only undelegated funds
// in case some funds where not withdrawn
if (toWithdraw > effectiveBalance) {
toWithdraw = effectiveBalance;
}
stakers[msg.sender] = stakers[msg.sender].sub(toWithdraw);
if (toWithdraw > 0) payable(msg.sender).transfer(toWithdraw);
return toWithdraw;
}
function stakeNextValidator(uint256 _value, address _validator)
internal
returns (bool)
{
if (validators.length == 0) return false;
if (_validator != address(0)) {
consensus.delegate{ value: _value }(_validator);
return true;
}
uint256 perValidator =
totalDelegated().add(_value).div(validators.length);
uint256 left = _value;
for (uint256 i = 0; i < validators.length && left > 0; i++) {
uint256 cur =
consensus.delegatedAmount(address(this), validators[i]);
if (cur < perValidator) {
uint256 toDelegate = perValidator.sub(cur);
toDelegate = toDelegate < left ? toDelegate : left;
consensus.delegate{ value: toDelegate }(validators[i]);
left = left.sub(toDelegate);
}
}
return true;
}
function addValidator(address _v) public onlyOwner {
validators.push(_v);
}
function totalDelegated() public view returns (uint256) {
uint256 total = 0;
for (uint256 i = 0; i < validators.length; i++) {
uint256 cur =
consensus.delegatedAmount(address(this), validators[i]);
total = total.add(cur);
}
return total;
}
function removeValidator(address _validator) public onlyOwner {
uint256 delegated =
consensus.delegatedAmount(address(this), _validator);
if (delegated > 0) {
uint256 prevBalance = balance();
undelegateWithCatch(_validator, delegated);
// wasnt withdrawn because validator needs to be taken of active validators
if (balance() == prevBalance) {
// pendingValidators.push(_validator);
return;
}
}
for (uint256 i = 0; i < validators.length; i++) {
if (validators[i] == _validator) {
if (i < validators.length - 1)
validators[i] = validators[validators.length - 1];
validators.pop();
break;
}
}
}
function collectUBIInterest() public {
uint256 curDay = ubischeme.currentDay();
require(
curDay != lastDayCollected,
"can collect only once in a ubi cycle"
);
uint256 earnings = balance() - pendingFuseEarnings;
require(pendingFuseEarnings + earnings > 0, "no earnings to collect");
lastDayCollected = curDay;
uint256 fuseUBI =
earnings.mul(RATIO_BASE - stakeBackRatio).div(RATIO_BASE);
uint256 stakeBack = earnings - fuseUBI;
uint256[] memory fuseswapResult =
_buyGD(fuseUBI.add(pendingFuseEarnings)); //buy GD with X% of earnings
pendingFuseEarnings = fuseUBI.add(pendingFuseEarnings).sub(
fuseswapResult[0]
);
stakeNextValidator(stakeBack, address(0)); //stake back the rest of the earnings
uint256 gdBought = fuseswapResult[1];
uint256 keeperFee = gdBought.mul(keeperFeeRatio).div(RATIO_BASE);
if (keeperFee > 0) GD.transfer(msg.sender, keeperFee);
uint256 communityPoolContribution =
gdBought
.sub(keeperFee) //subtract fee
.mul(communityPoolRatio) // * ommunityPoolRatio
.div(RATIO_BASE); // = G$ after fee * communityPoolRatio%
uint256 ubiAfterFeeAndPool = gdBought.sub(communityPoolContribution);
GD.transfer(address(ubischeme), ubiAfterFeeAndPool); //transfer to ubischeme
communityPoolBalance = communityPoolBalance.add(
communityPoolContribution
);
emit UBICollected(
curDay,
ubiAfterFeeAndPool,
communityPoolContribution,
gdBought,
earnings,
pendingFuseEarnings,
msg.sender,
keeperFee
);
}
/**
* @dev internal method to buy GD from fuseswap
* @param _value fuse to be sold
* @return uniswap coversion results uint256[2]
*/
function _buyGD(uint256 _value) internal returns (uint256[] memory) {
//buy from uniwasp
require(_value > 0, "buy value should be > 0");
uint256 maxFuse = calcMaxFuseWithSlippage(_value);
address[] memory path = new address[](2);
path[1] = address(GD);
path[0] = uniswap.WETH();
return
uniswap.swapExactETHForTokens{ value: maxFuse }(
0,
path,
address(this),
now
);
}
function calcMaxFuseWithSlippage(uint256 _value)
public
view
returns (uint256)
{
(uint256 r_fuse, uint256 r_gd, ) = uniswapPair.getReserves();
return calcMaxFuseWithSlippage(r_fuse, r_gd, _value);
}
/**
* uniswap amountOut helper
*/
function getAmountOut(
uint256 _amountIn,
uint256 _reserveIn,
uint256 _reserveOut
) internal pure returns (uint256 amountOut) {
uint256 amountInWithFee = _amountIn.mul(997);
uint256 numerator = amountInWithFee.mul(_reserveOut);
uint256 denominator = _reserveIn.mul(1000).add(amountInWithFee);
amountOut = numerator / denominator;
}
/**
* @dev use binary search to find quantity that will result with slippage < maxSlippageRatio
*/
function calcMaxFuseWithSlippage(
uint256 r_fuse,
uint256 r_gd,
uint256 _value
) public view returns (uint256) {
uint256 start = 0;
uint256 end = _value.div(1e18); //save iterations by moving precision to whole Fuse quantity
uint256 curPriceWei = uint256(100).mul(r_fuse) / r_gd; //uniswap quote formula UniswapV2Library.sol
uint256 maxPriceWei =
curPriceWei.mul(RATIO_BASE.add(maxSlippageRatio)).div(RATIO_BASE);
uint256 fuseAmount = _value;
//Iterate while start not meets end
while (start <= end) {
// Find the mid index
uint256 midQuantityWei = start.add(end).mul(1e18).div(2); //restore quantity precision
if (midQuantityWei == 0) break;
uint256 gdForQuantity = getAmountOut(midQuantityWei, r_fuse, r_gd);
uint256 priceForQuantityWei =
rdiv(midQuantityWei, gdForQuantity.mul(1e16)).div(1e9);
if (priceForQuantityWei <= maxPriceWei) {
start = midQuantityWei.div(1e18) + 1; //reduce precision to whole quantity div 1e18
fuseAmount = midQuantityWei;
} else end = midQuantityWei.div(1e18) - 1; //reduce precision to whole quantity div 1e18
}
return fuseAmount;
}
function undelegateWithCatch(address _validator, uint256 _amount)
internal
returns (bool)
{
try consensus.withdraw(_validator, _amount) {
return true;
} catch Error(
string memory /*reason*/
) {
// This is executed in case
// revert was called inside getData
// and a reason string was provided.
return false;
} catch (
bytes memory /*lowLevelData*/
) {
// This is executed in case revert() was used
// or there was a failing assertion, division
// by zero, etc. inside getData.
return false;
}
}
function balance() internal view returns (uint256) {
return payable(address(this)).balance;
}
receive() external payable {}
}
Contract ABI
[{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"UBICollected","inputs":[{"type":"uint256","name":"currentDay","internalType":"uint256","indexed":true},{"type":"uint256","name":"ubi","internalType":"uint256","indexed":false},{"type":"uint256","name":"communityPool","internalType":"uint256","indexed":false},{"type":"uint256","name":"gdBought","internalType":"uint256","indexed":false},{"type":"uint256","name":"stakingRewards","internalType":"uint256","indexed":false},{"type":"uint256","name":"pendingFuseEarnings","internalType":"uint256","indexed":false},{"type":"address","name":"keeper","internalType":"address","indexed":false},{"type":"uint256","name":"keeperGDFee","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract GoodDollar"}],"name":"GD","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"RATIO_BASE","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"add","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"addValidator","inputs":[{"type":"address","name":"_v","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"_owner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"calcMaxFuseWithSlippage","inputs":[{"type":"uint256","name":"r_fuse","internalType":"uint256"},{"type":"uint256","name":"r_gd","internalType":"uint256"},{"type":"uint256","name":"_value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"calcMaxFuseWithSlippage","inputs":[{"type":"uint256","name":"_value","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"collectUBIInterest","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"communityPoolRatio","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IConsensus"}],"name":"consensus","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"int256","name":"z","internalType":"int256"}],"name":"imax","inputs":[{"type":"int256","name":"x","internalType":"int256"},{"type":"int256","name":"y","internalType":"int256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"int256","name":"z","internalType":"int256"}],"name":"imin","inputs":[{"type":"int256","name":"x","internalType":"int256"},{"type":"int256","name":"y","internalType":"int256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"keeperFeeRatio","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastDayCollected","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"max","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"maxSlippageRatio","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"min","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"mul","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"rdiv","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"removeValidator","inputs":[{"type":"address","name":"_validator","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"rmul","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"rpow","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"n","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setContracts","inputs":[{"type":"address","name":"_gd","internalType":"address"},{"type":"address","name":"_ubischeme","internalType":"address"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"stake","inputs":[{"type":"address","name":"_validator","internalType":"address"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"stake","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"stakeBackRatio","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"stakers","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"sub","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalDelegated","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract UBIScheme"}],"name":"ubischeme","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract Uniswap"}],"name":"uniswap","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract UniswapFactory"}],"name":"uniswapFactory","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract UniswapPair"}],"name":"uniswapPair","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"upgrade0","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"upgrade1","inputs":[{"type":"address","name":"_gd","internalType":"address"},{"type":"address","name":"_ubischeme","internalType":"address"},{"type":"address","name":"_uniswap","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"validators","inputs":[{"type":"uint256","name":"","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"wdiv","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"withdraw","inputs":[{"type":"uint256","name":"_value","internalType":"uint256"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"z","internalType":"uint256"}],"name":"wmul","inputs":[{"type":"uint256","name":"x","internalType":"uint256"},{"type":"uint256","name":"y","internalType":"uint256"}]},{"type":"receive","stateMutability":"payable"}]
Contract Creation Code
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