Address Details

contract

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

import "../../interfaces/common/IUniswapRouterETH.sol";
import "../../interfaces/common/IUniswapV2Pair.sol";
import "../../interfaces/synthetix/IStakingRewards.sol";

import "../common/StratManager.sol";
import "../common/FeeManager.sol";
import "../common/BaseStrategyTripleRewardLP.sol";

contract StrategyStakingTripleRewardLP is
  StratManager,
  BaseStrategyTripleRewardLP,
  FeeManager
{
  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  bool public harvestOnDeposit;

  /**
   * @dev Event that is fired each time someone harvests the strat.
   */
  event _SafeSwap(
    uint256 amountOut,
    uint256 amountInMax,
    address[] path,
    address to,
    uint256 deadline
  );

  constructor(
    address _want,
    address _chef,
    StratMgr memory stratMgr,
    address[] memory _outputToNativeRoute,
    address[] memory _outputToLp0Route,
    address[] memory _outputToLp1Route,
    address[] memory _output2ToOutputRoute,
    address[] memory _output3ToOutputRoute
  ) public StratManager(stratMgr) {
    want = _want;
    chef = _chef;
    // console.log("stratMgr %s ", stratMgr.vault);
    require(_outputToNativeRoute.length >= 2);
    output = _outputToNativeRoute[0];
    native = _outputToNativeRoute[_outputToNativeRoute.length - 1];
    outputToNativeRoute = _outputToNativeRoute;
    // setup lp routing
    lpToken0 = IUniswapV2Pair(want).token0();
    require(_outputToLp0Route[0] == output);
    require(_outputToLp0Route[_outputToLp0Route.length - 1] == lpToken0);
    outputToLp0Route = _outputToLp0Route;
    lpToken1 = IUniswapV2Pair(want).token1();
    require(_outputToLp1Route[0] == output);
    require(_outputToLp1Route[_outputToLp1Route.length - 1] == lpToken1);
    outputToLp1Route = _outputToLp1Route;
    // setup 2nd output
    require(_output2ToOutputRoute.length >= 2);
    output2 = _output2ToOutputRoute[0];
    require(_output2ToOutputRoute[_output2ToOutputRoute.length - 1] == output);
    output2ToOutputRoute = _output2ToOutputRoute;
    // setup 3rd output
    require(_output3ToOutputRoute.length >= 2);
    output3 = _output3ToOutputRoute[0];
    require(_output3ToOutputRoute[_output3ToOutputRoute.length - 1] == output);
    output3ToOutputRoute = _output3ToOutputRoute;

    // outputs are not the same
    require(output != output2 && output != output3);
    _giveAllowances();
  }

  // puts the funds to work
  function deposit() public override {
    uint256 wantBal = IERC20(want).balanceOf(address(this));

    if (wantBal > 0) {
      IStakingRewards(chef).stake(wantBal);
    }
  }

  function withdraw(uint256 _amount) external {
    require(msg.sender == vault, "!vault");

    uint256 wantBal = IERC20(want).balanceOf(address(this));

    if (wantBal < _amount) {
      IStakingRewards(chef).withdraw(_amount.sub(wantBal));

      wantBal = IERC20(want).balanceOf(address(this));
    }

    if (wantBal > _amount) {
      wantBal = _amount;
    }

    if (tx.origin == owner() || paused()) {
      IERC20(want).safeTransfer(vault, wantBal);
    } else {
      uint256 withdrawalFeeAmount = wantBal.mul(withdrawalFee).div(
        WITHDRAWAL_MAX
      );
      IERC20(want).safeTransfer(vault, wantBal.sub(withdrawalFeeAmount));
    }
  }

  function beforeDeposit() external override {
    if (harvestOnDeposit) {
      require(msg.sender == vault, "!vault");
      _harvest(nullAddress);
    }
  }

  // performance fees
  function chargeFees(address callFeeRecipient) internal override {
    // take fee from output
    uint256 toNative = IERC20(output).balanceOf(address(this)).mul(45).div(
      1000
    );

    _safeSwap(toNative, outputToNativeRoute, address(this));

    uint256 nativeBal = IERC20(native).balanceOf(address(this));

    uint256 callFeeAmount = nativeBal.mul(callFee).div(MAX_FEE);
    if (callFeeRecipient != nullAddress) {
      IERC20(native).safeTransfer(callFeeRecipient, callFeeAmount);
    } else {
      IERC20(native).safeTransfer(tx.origin, callFeeAmount);
    }

    uint256 autocompFeeAmount = nativeBal.mul(autocompFee).div(MAX_FEE);
    IERC20(native).safeTransfer(autocompFeeRecipient, autocompFeeAmount);

    uint256 strategistFee = nativeBal.mul(STRATEGIST_FEE).div(MAX_FEE);
    IERC20(native).safeTransfer(strategist, strategistFee);
  }

  // calculate the total underlaying 'want' held by the strat.
  function balanceOf() public view returns (uint256) {
    return balanceOfWant().add(balanceOfPool());
  }

  // it calculates how much 'want' this contract holds.
  function balanceOfWant() public view returns (uint256) {
    return IERC20(want).balanceOf(address(this));
  }

  // it calculates how much 'want' the strategy has working in the farm.
  function balanceOfPool() public view returns (uint256) {
    uint256 _amount = IStakingRewards(chef).balanceOf(address(this));

    return _amount;
  }

  // called as part of strat migration. Sends all the available funds back to the vault.
  function retireStrat() external {
    require(msg.sender == vault, "!vault");

    IStakingRewards(chef).withdraw(balanceOf());

    uint256 wantBal = IERC20(want).balanceOf(address(this));
    IERC20(want).transfer(vault, wantBal);
  }

  function setHarvestOnDeposit(bool _harvestOnDeposit) external onlyManager {
    harvestOnDeposit = _harvestOnDeposit;

    if (harvestOnDeposit) {
      setWithdrawalFee(0);
    } else {
      setWithdrawalFee(10);
    }
  }

  function _safeSwap(
    uint256 _amountIn,
    address[] memory _path,
    address _to
  ) internal override {
    // swapExactTokensForTokens
    emit _SafeSwap(_amountIn, 0, _path, _to, block.timestamp.add(600));

    if (_amountIn > 0) {
      IUniswapRouterETH(unirouter).swapExactTokensForTokens(
        _amountIn,
        0,
        _path,
        _to,
        block.timestamp.add(600)
      );
    }
  }

  function _addLiquidity(uint256 lp0Bal, uint256 lp1Bal) internal override {
    IUniswapRouterETH(unirouter).addLiquidity(
      lpToken0,
      lpToken1,
      lp0Bal,
      lp1Bal,
      1,
      1,
      address(this),
      block.timestamp
    );
  }

  // pauses deposits and withdraws all funds from third party systems.
  function panic() public onlyManager {
    pause();
    IStakingRewards(chef).withdraw(balanceOf());
  }

  function pause() public onlyManager {
    _pause();

    _removeAllowances();
  }

  function unpause() external onlyManager {
    _unpause();

    _giveAllowances();

    deposit();
  }

  function _giveAllowances() internal {
    IERC20(want).safeApprove(chef, type(uint256).max);
    IERC20(output).safeApprove(unirouter, type(uint256).max);
    IERC20(lpToken0).safeApprove(unirouter, 0);
    IERC20(lpToken0).safeApprove(unirouter, type(uint256).max);
    IERC20(lpToken1).safeApprove(unirouter, 0);
    IERC20(lpToken1).safeApprove(unirouter, type(uint256).max);
    IERC20(output2).safeApprove(unirouter, 0);
    IERC20(output2).safeApprove(unirouter, type(uint256).max);
    IERC20(output3).safeApprove(unirouter, 0);
    IERC20(output3).safeApprove(unirouter, type(uint256).max);
  }

  function _removeAllowances() internal {
    IERC20(want).safeApprove(chef, 0);
    IERC20(output).safeApprove(unirouter, 0);
    IERC20(output2).safeApprove(unirouter, 0);
    IERC20(output3).safeApprove(unirouter, 0);
    IERC20(lpToken0).safeApprove(unirouter, 0);
    IERC20(lpToken1).safeApprove(unirouter, 0);
  }
}
        

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.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 Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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;
        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");

        (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");

        (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");

        (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 v3.4._
     */
    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 v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 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 Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // 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 (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @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) {
        return a + b;
    }

    /**
     * @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 a - b;
    }

    /**
     * @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) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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 a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.9.0;

interface IUniswapRouterETH {
    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);

    function swapExactTokensForTokens(
        uint amountIn, 
        uint amountOutMin, 
        address[] calldata path, 
        address to, 
        uint deadline
    ) external returns (uint[] memory amounts);

    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);

    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IUniswapV2Pair {
  function factory() external view returns (address);

  function token0() external view returns (address);

  function token1() external view returns (address);

  function burn(address to) external returns (uint256 amount0, uint256 amount1);

  function getReserves()
    external
    view
    returns (
      uint112 reserve0,
      uint112 reserve1,
      uint32 blockTimestampLast
    );
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// import "../../../openzeppelin-solidity/contracts/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

// https://docs.synthetix.io/contracts/source/interfaces/istakingrewards
interface IStakingRewards {
  // Views
  function rewardsToken() external view returns (IERC20);

  function stakingToken() external view returns (IERC20);

  function lastTimeRewardApplicable() external view returns (uint256);

  function rewardPerToken() external view returns (uint256);

  function earned(address account) external view returns (uint256);

  function getRewardForDuration() external view returns (uint256);

  function totalSupply() external view returns (uint256);

  function balanceOf(address account) external view returns (uint256);

  // Mutative

  function stake(uint256 amount) external;

  function withdraw(uint256 amount) external;

  function getReward() external;

  function exit() external;
}
          

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

import "../../interfaces/synthetix/IStakingRewards.sol";

import "./StratManager.sol";

abstract contract BaseStrategyTripleRewardLP is StratManager {
  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  // Tokens used
  address public native;
  address public output;
  address public want;
  address public lpToken0;
  address public lpToken1;
  address constant nullAddress = address(0);

  // 2nd reward
  address public output2;

  // 3rd reward
  address public output3;

  // Third party contracts
  address public chef;

  uint256 public lastHarvest;

  // Routes
  address[] public outputToNativeRoute;
  address[] public outputToLp0Route;
  address[] public outputToLp1Route;
  address[] public output2ToOutputRoute;
  address[] public output3ToOutputRoute;

  function chargeFees(address) internal virtual;

  function deposit() public virtual;

  function _safeSwap(
    uint256 _amountIn,
    address[] memory _path,
    address _to
  ) internal virtual;

  function _addLiquidity(uint256 lp0Bal, uint256 lp1Bal) internal virtual;

  //events
  event StratHarvest(address indexed harvester);

  function harvest() external virtual {
    _harvest(nullAddress);
  }

  function harvestWithCallFeeRecipient(address callFeeRecipient)
    external
    virtual
  {
    _harvest(callFeeRecipient);
  }

  function managerHarvest() external onlyManager {
    _harvest(nullAddress);
  }

  // compounds earnings and charges performance fee
  function _harvest(address callFeeRecipient) internal whenNotPaused {
    IStakingRewards(chef).getReward();

    uint256 output2Bal = IERC20(output2).balanceOf(address(this));
    uint256 output3Bal = IERC20(output3).balanceOf(address(this));

    _safeSwap(output2Bal, output2ToOutputRoute, address(this));
    _safeSwap(output3Bal, output3ToOutputRoute, address(this));

    uint256 finalOutputBal = IERC20(output).balanceOf(address(this));

    if (finalOutputBal > 0) {
      chargeFees(callFeeRecipient);
      addLiquidity();
      deposit();
      lastHarvest = block.timestamp;
      emit StratHarvest(msg.sender);
    }
  }

  // Adds liquidity to AMM and gets more LP tokens.
  function addLiquidity() internal {
    uint256 outputHalf = IERC20(output).balanceOf(address(this)).div(2);

    if (lpToken0 != output) {
      _safeSwap(outputHalf, outputToLp0Route, address(this));
    }

    if (lpToken1 != output) {
      _safeSwap(outputHalf, outputToLp1Route, address(this));
    }

    uint256 lp0Bal = IERC20(lpToken0).balanceOf(address(this));
    uint256 lp1Bal = IERC20(lpToken1).balanceOf(address(this));
    if (lp0Bal > 0 && lp1Bal > 0) {
      _addLiquidity(lp0Bal, lp1Bal);
    }
  }
}
          

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./StratManager.sol";

abstract contract FeeManager is StratManager {
  uint256 public constant STRATEGIST_FEE = 112;
  uint256 public constant MAX_FEE = 1000;
  uint256 public constant MAX_CALL_FEE = 111;

  uint256 public constant WITHDRAWAL_FEE_CAP = 50;
  uint256 public constant WITHDRAWAL_MAX = 10000;

  uint256 public withdrawalFee = 10;

  uint256 public callFee = 111;
  uint256 public autocompFee = MAX_FEE - STRATEGIST_FEE - callFee;

  function setCallFee(uint256 _fee) public onlyManager {
    require(_fee <= MAX_CALL_FEE, "!cap");

    callFee = _fee;
    autocompFee = MAX_FEE - STRATEGIST_FEE - callFee;
  }

  function setWithdrawalFee(uint256 _fee) public onlyManager {
    require(_fee <= WITHDRAWAL_FEE_CAP, "!cap");

    withdrawalFee = _fee;
  }
}
          

// SPDX-License-Identifier: MIT

pragma solidity >=0.4.22 <0.9.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/Pausable.sol";

contract StratManager is Ownable, Pausable {
  /**
   * @dev Autocomp Contracts:
   * {keeper} - Address to manage a few lower risk features of the strat
   * {strategist} - Address of the strategy author/deployer where strategist fee will go.
   * {vault} - Address of the vault that controls the strategy's funds.
   * {unirouter} - Address of exchange to execute swaps.
   */
  address public keeper;
  address public strategist;
  address public unirouter;
  address public vault;
  address public harvester;
  address public autocompFeeRecipient;

  struct StratMgr {
    address keeper;
    address strategist;
    address unirouter;
    address vault;
    address harvester;
    address autocompFeeRecipient;
  }

  /**
   * @dev Initializes the base strategy.
   * @param stratMgr.keeper address to use as alternative owner.
   * @param stratMgr.strategist address where strategist fees go.
   * @param stratMgr.unirouter router to use for swaps
   * @param stratMgr.vault address of parent vault.
   * @param stratMgr.autocompFeeRecipient address where to send autocomp's fees.
   */
  constructor(StratMgr memory stratMgr) public {
    keeper = stratMgr.keeper;
    strategist = stratMgr.strategist;
    unirouter = stratMgr.unirouter;
    vault = stratMgr.vault;
    harvester = stratMgr.harvester;
    autocompFeeRecipient = stratMgr.autocompFeeRecipient;
  }

  // checks that caller is either owner or keeper.
  modifier onlyManager() {
    require(msg.sender == owner() || msg.sender == keeper, "!manager");
    _;
  }

  // checks that caller is harvestr.
  modifier onlyHarvester() {
    require(msg.sender == harvester, "!harvester");
    _;
  }

  /**
   * @dev Updates address of the strat keeper.
   * @param _keeper new keeper address.
   */
  function setKeeper(address _keeper) external onlyManager {
    keeper = _keeper;
  }

  /**
   * @dev Updates address of the strat harvester.
   * @param _harvester new harvester address.
   */
  function setHarvester(address _harvester) external onlyManager {
    harvester = _harvester;
  }

  /**
   * @dev Updates address where strategist fee earnings will go.
   * @param _strategist new strategist address.
   */
  function setStrategist(address _strategist) external {
    require(msg.sender == strategist, "!strategist");
    strategist = _strategist;
  }

  /**
   * @dev Updates router that will be used for swaps.
   * @param _unirouter new unirouter address.
   */
  function setUnirouter(address _unirouter) external onlyOwner {
    unirouter = _unirouter;
  }

  /**
   * @dev Updates parent vault.
   * @param _vault new vault address.
   */
  function setVault(address _vault) external onlyOwner {
    vault = _vault;
  }

  /**
   * @dev Updates autocomp fee recipient.
   * @param _autocompFeeRecipient new autocomp fee recipient address.
   */
  function setAutocompFeeRecipient(address _autocompFeeRecipient)
    external
    onlyOwner
  {
    autocompFeeRecipient = _autocompFeeRecipient;
  }

  /**
   * @dev Function to synchronize balances before new user deposit.
   * Can be overridden in the strategy.
   */
  function beforeDeposit() external virtual {}
}