ETH Price: $3,563.43 (-0.61%)
Gas: 39 Gwei

Contract

0xdA2D30c659cFEb176053B22Be11fc351e077FDc0
 

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0x61010060141321102022-02-03 9:08:16784 days ago1643879296IN
 Create: YearnSilo
0 ETH0.0643364880

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Contract Source Code Verified (Exact Match)

Contract Name:
YearnSilo

Compiler Version
v0.8.10+commit.fc410830

Optimization Enabled:
Yes with 800 runs

Other Settings:
default evmVersion
File 1 of 5 : YearnSilo.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

import "contracts/libraries/FullMath.sol";
import "contracts/interfaces/ISilo.sol";

interface IYearnVault {
    /// @notice The vault's name. ex: UNI yVault
    function name() external view returns (string memory);

    /// @notice The number of decimals on the yToken
    function decimals() external view returns (uint256);

    /// @notice The address of the underlying token
    function token() external view returns (address);

    /// @notice Similar to Compound's `exchangeRateStored()`, but scaled by `10 ** decimals()` instead of `10 ** 18`
    function pricePerShare() external view returns (uint256);

    /// @notice A standard ERC20 balance getter
    function balanceOf(address user) external view returns (uint256 shares);

    /// @notice The maximum `amount` of underlying that can be deposited
    function availableDepositLimit() external view returns (uint256 amount);

    /// @notice The maximum number of `shares` that can be withdrawn atomically
    function maxAvailableShares() external view returns (uint256 shares);

    /// @notice Deposits `amount` of underlying to the vault
    function deposit(uint256 amount) external returns (uint256 shares);

    /// @notice Burns up to `maxShares` shares and gives `amount` of underlying
    function withdraw(uint256 maxShares, address recipient, uint256 maxLoss) external returns (uint256 amount);
}

contract YearnSilo is ISilo {
    /// @inheritdoc ISilo
    string public name;

    IYearnVault public immutable vault;

    uint256 public immutable maxYearnWithdrawLoss;

    address public immutable underlying;

    uint256 private immutable decimals;

    constructor(IYearnVault _vault, uint256 _maxYearnWithdrawLoss) {
        vault = _vault;
        maxYearnWithdrawLoss = _maxYearnWithdrawLoss;
        underlying = vault.token();
        decimals = vault.decimals();

        // ex: UNI yVault Silo
        name = string(
            abi.encodePacked(
                vault.name(),
                " Silo"
            )
        );
    }

    /// @inheritdoc ISilo
    function poke() external override {}

    /// @inheritdoc ISilo
    function deposit(uint256 amount) external override {
        if (amount == 0) return;

        // If Yearn deposits are capped, deposit as much as possible and hold the rest in Blend contract
        uint256 maxDepositable = vault.availableDepositLimit();
        if (amount > maxDepositable) amount = maxDepositable;

        _approve(underlying, address(vault), amount);
        vault.deposit(amount);
    }

    /// @inheritdoc ISilo
    function withdraw(uint256 amount) external override {
        if (amount == 0) return;
        
        uint256 shares = FullMath.mulDivRoundingUp(
            amount,
            10_000 * 10 ** decimals,
            vault.pricePerShare() * (10_000 - maxYearnWithdrawLoss)
        );

        require(vault.withdraw(shares, address(this), maxYearnWithdrawLoss) >= amount, "Yearn: withdraw failed");
    }

    /// @inheritdoc ISilo
    function balanceOf(address account) external view override returns (uint256 balance) {
        uint256 shares = vault.balanceOf(account);
        uint256 maxWithdrawable = vault.maxAvailableShares();
        // If Blend isn't able to atomically withdraw shares, it doesn't *really* own them
        if (shares > maxWithdrawable) shares = maxWithdrawable;

        balance = FullMath.mulDiv(
            shares,
            vault.pricePerShare() * (10_000 - maxYearnWithdrawLoss),
            10_000 * 10 ** decimals
        );
    }

    /// @inheritdoc ISilo
    function shouldAllowRemovalOf(address token) external view override returns (bool shouldAllow) {
        shouldAllow = token != address(vault);
    }

    function _approve(
        address token,
        address spender,
        uint256 amount
    ) private {
        // 200 gas to read uint256
        if (IERC20(token).allowance(address(this), spender) < amount) {
            // 20000 gas to write uint256 if changing from zero to non-zero
            // 5000  gas to write uint256 if changing from non-zero to non-zero
            IERC20(token).approve(spender, type(uint256).max);
        }
    }
}

File 2 of 5 : IERC20Metadata.sol
// 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);
}

File 3 of 5 : FullMath.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

/// @title Contains 512-bit math functions
/// @notice Facilitates multiplication and division that can have overflow of an intermediate value without any loss of precision
/// @dev Handles "phantom overflow" i.e., allows multiplication and division where an intermediate value overflows 256 bits
library FullMath {
    /// @notice Calculates floor(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    /// @dev Credit to Remco Bloemen under MIT license https://xn--2-umb.com/21/muldiv
    function mulDiv(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        // Handle division by zero
        require(denominator != 0);

        // 512-bit multiply [prod1 prod0] = a * b
        // Compute the product mod 2**256 and mod 2**256 - 1
        // then use the Chinese Remainder Theorem to reconstruct
        // the 512 bit result. The result is stored in two 256
        // variables such that product = prod1 * 2**256 + prod0
        uint256 prod0; // Least significant 256 bits of the product
        uint256 prod1; // Most significant 256 bits of the product
        assembly {
            let mm := mulmod(a, b, not(0))
            prod0 := mul(a, b)
            prod1 := sub(sub(mm, prod0), lt(mm, prod0))
        }

        // Short circuit 256 by 256 division
        // This saves gas when a * b is small, at the cost of making the
        // large case a bit more expensive. Depending on your use case you
        // may want to remove this short circuit and always go through the
        // 512 bit path.
        if (prod1 == 0) {
            assembly {
                result := div(prod0, denominator)
            }
            return result;
        }

        ///////////////////////////////////////////////
        // 512 by 256 division.
        ///////////////////////////////////////////////

        // Handle overflow, the result must be < 2**256
        require(prod1 < denominator);

        // Make division exact by subtracting the remainder from [prod1 prod0]
        // Compute remainder using mulmod
        // Note mulmod(_, _, 0) == 0
        uint256 remainder;
        assembly {
            remainder := mulmod(a, b, denominator)
        }
        // Subtract 256 bit number from 512 bit number
        assembly {
            prod1 := sub(prod1, gt(remainder, prod0))
            prod0 := sub(prod0, remainder)
        }

        // Factor powers of two out of denominator
        // Compute largest power of two divisor of denominator.
        // Always >= 1.
        unchecked {
            // https://ethereum.stackexchange.com/a/96646
            uint256 twos = (type(uint256).max - denominator + 1) & denominator;
            // Divide denominator by power of two
            assembly {
                denominator := div(denominator, twos)
            }

            // Divide [prod1 prod0] by the factors of two
            assembly {
                prod0 := div(prod0, twos)
            }
            // Shift in bits from prod1 into prod0. For this we need
            // to flip `twos` such that it is 2**256 / twos.
            // If twos is zero, then it becomes one
            assembly {
                twos := add(div(sub(0, twos), twos), 1)
            }
            prod0 |= prod1 * twos;

            // Invert denominator mod 2**256
            // Now that denominator is an odd number, it has an inverse
            // modulo 2**256 such that denominator * inv = 1 mod 2**256.
            // Compute the inverse by starting with a seed that is correct
            // correct for four bits. That is, denominator * inv = 1 mod 2**4
            // If denominator is zero the inverse starts with 2
            uint256 inv = (3 * denominator) ^ 2;
            // Now use Newton-Raphson iteration to improve the precision.
            // Thanks to Hensel's lifting lemma, this also works in modular
            // arithmetic, doubling the correct bits in each step.
            inv *= 2 - denominator * inv; // inverse mod 2**8
            inv *= 2 - denominator * inv; // inverse mod 2**16
            inv *= 2 - denominator * inv; // inverse mod 2**32
            inv *= 2 - denominator * inv; // inverse mod 2**64
            inv *= 2 - denominator * inv; // inverse mod 2**128
            inv *= 2 - denominator * inv; // inverse mod 2**256
            // If denominator is zero, inv is now 128

            // Because the division is now exact we can divide by multiplying
            // with the modular inverse of denominator. This will give us the
            // correct result modulo 2**256. Since the precoditions guarantee
            // that the outcome is less than 2**256, this is the final result.
            // We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inv;
            return result;
        }
    }

    /// @notice Calculates ceil(a×b÷denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    /// @param a The multiplicand
    /// @param b The multiplier
    /// @param denominator The divisor
    /// @return result The 256-bit result
    function mulDivRoundingUp(
        uint256 a,
        uint256 b,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        result = mulDiv(a, b, denominator);
        if (mulmod(a, b, denominator) > 0) {
            require(result < type(uint256).max);
            result++;
        }
    }
}

File 4 of 5 : ISilo.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface ISilo {
    /// @notice A descriptive name for the silo (ex: Compound USDC Silo)
    function name() external view returns (string memory);

    /// @notice A place to update the silo's internal state
    /// @dev After this has been called, balances reported by `balanceOf` MUST be correct
    function poke() external;

    /// @notice Deposits `amount` of the underlying token
    function deposit(uint256 amount) external;

    /// @notice Withdraws EXACTLY `amount` of the underlying token
    function withdraw(uint256 amount) external;

    /// @notice Reports how much of the underlying token `account` has stored
    /// @dev Must never overestimate `balance`. Should give the exact, correct value after `poke` is called
    function balanceOf(address account) external view returns (uint256 balance);

    /**
     * @notice Whether the given token is irrelevant to the silo's strategy (`shouldAllow = true`) or
     * is required for proper management (`shouldAllow = false`). ex: Compound silos shouldn't allow
     * removal of cTokens, but the may allow removal of COMP rewards.
     * @dev Removed tokens are used to help incentivize rebalances for the Blend vault that uses the silo. So
     * if you want something like COMP rewards to go to Blend *users* instead, you'd have to implement a
     * trading function as part of `poke()` to convert COMP to the underlying token.
     */
    function shouldAllowRemovalOf(address token) external view returns (bool shouldAllow);
}

File 5 of 5 : IERC20.sol
// 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);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract IYearnVault","name":"_vault","type":"address"},{"internalType":"uint256","name":"_maxYearnWithdrawLoss","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maxYearnWithdrawLoss","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"poke","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"shouldAllowRemovalOf","outputs":[{"internalType":"bool","name":"shouldAllow","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"underlying","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vault","outputs":[{"internalType":"contract IYearnVault","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000a696a63cc78dffa1a63e9e50587c197387ff6c7e0000000000000000000000000000000000000000000000000000000000000001

-----Decoded View---------------
Arg [0] : _vault (address): 0xA696a63cc78DfFa1a63E9E50587C197387FF6C7E
Arg [1] : _maxYearnWithdrawLoss (uint256): 1

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000a696a63cc78dffa1a63e9e50587c197387ff6c7e
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000001


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