Contract Source Code:
File 1 of 1 : VETH
// SPDX-License-Identifier: MIT
// File: @openzeppelin/contracts/GSN/Context.sol
pragma solidity ^0.6.0;
/*
* @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 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 Context {
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;
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.6.0;
/**
* @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);
}
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.6.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File: @openzeppelin/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.6.0;
/**
* @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 guidelines: functions revert instead
* of 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 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view 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 {_setupDecimals} is
* called.
*
* 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 returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view 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);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
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].add(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) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is 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);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(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
*
* - `to` 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 = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(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);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @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 to 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 { }
}
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
pragma solidity ^0.6.0;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol
pragma solidity ^0.6.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// File: contracts/Pausable.sol
pragma solidity 0.6.12;
/**
* @dev Contract module which allows children to implement an emergency stop
* mechanism that can be triggered by an authorized account.
*
*/
contract Pausable is Context {
event Paused(address account);
event Shutdown(address account);
event Unpaused(address account);
event Open(address account);
bool public paused;
bool public stopEverything;
modifier whenNotPaused() {
require(!paused, "Pausable: paused");
_;
}
modifier whenPaused() {
require(paused, "Pausable: not paused");
_;
}
modifier whenNotShutdown() {
require(!stopEverything, "Pausable: shutdown");
_;
}
modifier whenShutdown() {
require(stopEverything, "Pausable: not shutdown");
_;
}
/// @dev Pause contract operations, if contract is not paused.
function _pause() internal virtual whenNotPaused {
paused = true;
emit Paused(_msgSender());
}
/// @dev Unpause contract operations, allow only if contract is paused and not shutdown.
function _unpause() internal virtual whenPaused whenNotShutdown {
paused = false;
emit Unpaused(_msgSender());
}
/// @dev Shutdown contract operations, if not already shutdown.
function _shutdown() internal virtual whenNotShutdown {
stopEverything = true;
paused = true;
emit Shutdown(_msgSender());
}
/// @dev Open contract operations, if contract is in shutdown state
function _open() internal virtual whenShutdown {
stopEverything = false;
emit Open(_msgSender());
}
}
// File: contracts/interfaces/vesper/IController.sol
pragma solidity 0.6.12;
interface IController {
function aaveReferralCode() external view returns (uint16);
function feeCollector(address) external view returns (address);
function founderFee() external view returns (uint256);
function founderVault() external view returns (address);
function interestFee(address) external view returns (uint256);
function isPool(address) external view returns (bool);
function pools() external view returns (address);
function strategy(address) external view returns (address);
function rebalanceFriction(address) external view returns (uint256);
function poolRewards(address) external view returns (address);
function treasuryPool() external view returns (address);
function uniswapRouter() external view returns (address);
function withdrawFee(address) external view returns (uint256);
}
// File: contracts/interfaces/vesper/IVesperPool.sol
pragma solidity 0.6.12;
interface IVesperPool is IERC20 {
function approveToken() external;
function deposit() external payable;
function deposit(uint256) external;
function multiTransfer(uint256[] memory) external returns (bool);
function permit(
address,
address,
uint256,
uint256,
uint8,
bytes32,
bytes32
) external;
function rebalance() external;
function resetApproval() external;
function sweepErc20(address) external;
function withdraw(uint256) external;
function withdrawETH(uint256) external;
function withdrawByStrategy(uint256) external;
function feeCollector() external view returns (address);
function getPricePerShare() external view returns (uint256);
function token() external view returns (address);
function tokensHere() external view returns (uint256);
function totalValue() external view returns (uint256);
function withdrawFee() external view returns (uint256);
}
// File: contracts/interfaces/vesper/IPoolRewards.sol
pragma solidity 0.6.12;
interface IPoolRewards {
function notifyRewardAmount(uint256) external;
function claimReward(address) external;
function updateReward(address) external;
function rewardForDuration() external view returns (uint256);
function claimable(address) external view returns (uint256);
function pool() external view returns (address);
function lastTimeRewardApplicable() external view returns (uint256);
function rewardPerToken() external view returns (uint256);
}
// File: sol-address-list/contracts/interfaces/IAddressList.sol
pragma solidity ^0.6.6;
interface IAddressList {
event AddressUpdated(address indexed a, address indexed sender);
event AddressRemoved(address indexed a, address indexed sender);
function add(address a) external returns (bool);
function addValue(address a, uint256 v) external returns (bool);
function addMulti(address[] calldata addrs) external returns (uint256);
function addValueMulti(address[] calldata addrs, uint256[] calldata values) external returns (uint256);
function remove(address a) external returns (bool);
function removeMulti(address[] calldata addrs) external returns (uint256);
function get(address a) external view returns (uint256);
function contains(address a) external view returns (bool);
function at(uint256 index) external view returns (address, uint256);
function length() external view returns (uint256);
}
// File: sol-address-list/contracts/interfaces/IAddressListExt.sol
pragma solidity ^0.6.6;
interface IAddressListExt is IAddressList {
function hasRole(bytes32 role, address account) external view returns (bool);
function getRoleMemberCount(bytes32 role) external view returns (uint256);
function getRoleMember(bytes32 role, uint256 index) external view returns (address);
function getRoleAdmin(bytes32 role) external view returns (bytes32);
function grantRole(bytes32 role, address account) external;
function revokeRole(bytes32 role, address account) external;
function renounceRole(bytes32 role, address account) external;
}
// File: sol-address-list/contracts/interfaces/IAddressListFactory.sol
pragma solidity ^0.6.6;
interface IAddressListFactory {
event ListCreated(address indexed _sender, address indexed _newList);
function ours(address a) external view returns (bool);
function listCount() external view returns (uint256);
function listAt(uint256 idx) external view returns (address);
function createList() external returns (address listaddr);
}
// File: contracts/pools/PoolShareToken.sol
pragma solidity 0.6.12;
/// @title Holding pool share token
// solhint-disable no-empty-blocks
abstract contract PoolShareToken is ERC20, Pausable, ReentrancyGuard {
using SafeERC20 for IERC20;
IERC20 public immutable token;
IAddressListExt public immutable feeWhiteList;
IController public immutable controller;
/// @dev The EIP-712 typehash for the contract's domain
bytes32 public constant DOMAIN_TYPEHASH =
keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
);
/// @dev The EIP-712 typehash for the permit struct used by the contract
bytes32 public constant PERMIT_TYPEHASH =
keccak256(
"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
);
bytes32 public immutable domainSeparator;
uint256 internal constant MAX_UINT_VALUE = uint256(-1);
mapping(address => uint256) public nonces;
event Deposit(address indexed owner, uint256 shares, uint256 amount);
event Withdraw(address indexed owner, uint256 shares, uint256 amount);
constructor(
string memory _name,
string memory _symbol,
address _token,
address _controller
) public ERC20(_name, _symbol) {
uint256 chainId;
assembly {
chainId := chainid()
}
token = IERC20(_token);
controller = IController(_controller);
IAddressListFactory factory =
IAddressListFactory(0xD57b41649f822C51a73C44Ba0B3da4A880aF0029);
IAddressListExt _feeWhiteList = IAddressListExt(factory.createList());
_feeWhiteList.grantRole(keccak256("LIST_ADMIN"), _controller);
feeWhiteList = _feeWhiteList;
domainSeparator = keccak256(
abi.encode(
DOMAIN_TYPEHASH,
keccak256(bytes(_name)),
keccak256(bytes("1")),
chainId,
address(this)
)
);
}
/**
* @notice Deposit ERC20 tokens and receive pool shares depending on the current share price.
* @dev Modifier updatedReward is being used to update reward earning of caller.
* @param amount ERC20 token amount.
*/
function deposit(uint256 amount) external virtual nonReentrant whenNotPaused {
_deposit(amount);
}
/**
* @notice Deposit ERC20 tokens with permit aka gasless approval.
* @dev Modifier updatedReward is being used to update reward earning of caller.
* @param amount ERC20 token amount.
* @param deadline The time at which signature will expire
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function depositWithPermit(
uint256 amount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external nonReentrant whenNotPaused {
IVesperPool(address(token)).permit(_msgSender(), address(this), amount, deadline, v, r, s);
_deposit(amount);
}
/**
* @notice Withdraw collateral based on given shares and the current share price.
* @dev Modifier updatedReward is being used to update reward earning of caller.
* Transfer earned rewards to caller. Withdraw fee, if any, will be deduced from
* given shares and transferred to feeCollector. Burn remaining shares and return collateral.
* @param shares Pool shares. It will be in 18 decimals.
*/
function withdraw(uint256 shares) external virtual nonReentrant whenNotShutdown {
_withdraw(shares);
}
/**
* @notice Withdraw collateral based on given shares and the current share price.
* @dev Modifier updatedReward is being used to update reward earning of caller.
* Transfer earned rewards to caller. Burn shares and return collateral.
* @dev No withdraw fee will be assessed when this function is called.
* Only some white listed address can call this function.
* @param shares Pool shares. It will be in 18 decimals.
*/
function withdrawByStrategy(uint256 shares) external virtual nonReentrant whenNotShutdown {
require(feeWhiteList.get(_msgSender()) != 0, "Not a white listed address");
_withdrawByStrategy(shares);
}
/**
* @notice Transfer tokens to multiple recipient
* @dev Left 160 bits are the recipient address and the right 96 bits are the token amount.
* @param bits array of uint
* @return true/false
*/
function multiTransfer(uint256[] memory bits) external returns (bool) {
for (uint256 i = 0; i < bits.length; i++) {
address a = address(bits[i] >> 96);
uint256 amount = bits[i] & ((1 << 96) - 1);
require(transfer(a, amount), "Transfer failed");
}
return true;
}
/**
* @notice Triggers an approval from owner to spends
* @param owner The address to approve from
* @param spender The address to be approved
* @param amount The number of tokens that are approved (2^256-1 means infinite)
* @param deadline The time at which to expire the signature
* @param v The recovery byte of the signature
* @param r Half of the ECDSA signature pair
* @param s Half of the ECDSA signature pair
*/
function permit(
address owner,
address spender,
uint256 amount,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
require(deadline >= block.timestamp, "Expired");
bytes32 digest =
keccak256(
abi.encodePacked(
"\x19\x01",
domainSeparator,
keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
amount,
nonces[owner]++,
deadline
)
)
)
);
address signatory = ecrecover(digest, v, r, s);
require(signatory != address(0) && signatory == owner, "Invalid signature");
_approve(owner, spender, amount);
}
/**
* @notice Get price per share
* @dev Return value will be in token defined decimals.
*/
function getPricePerShare() external view returns (uint256) {
if (totalSupply() == 0) {
return convertFrom18(1e18);
}
return totalValue().mul(1e18).div(totalSupply());
}
/// @dev Convert to 18 decimals from token defined decimals. Default no conversion.
function convertTo18(uint256 amount) public pure virtual returns (uint256) {
return amount;
}
/// @dev Convert from 18 decimals to token defined decimals. Default no conversion.
function convertFrom18(uint256 amount) public pure virtual returns (uint256) {
return amount;
}
/// @dev Get fee collector address
function feeCollector() public view virtual returns (address) {
return controller.feeCollector(address(this));
}
/// @dev Returns the token stored in the pool. It will be in token defined decimals.
function tokensHere() public view virtual returns (uint256) {
return token.balanceOf(address(this));
}
/**
* @dev Returns sum of token locked in other contracts and token stored in the pool.
* Default tokensHere. It will be in token defined decimals.
*/
function totalValue() public view virtual returns (uint256) {
return tokensHere();
}
/**
* @notice Get withdraw fee for this pool
* @dev Format: 1e16 = 1% fee
*/
function withdrawFee() public view virtual returns (uint256) {
return controller.withdrawFee(address(this));
}
/**
* @dev Hook that is called just before burning tokens. To be used i.e. if
* collateral is stored in a different contract and needs to be withdrawn.
* @param share Pool share in 18 decimals
*/
function _beforeBurning(uint256 share) internal virtual {}
/**
* @dev Hook that is called just after burning tokens. To be used i.e. if
* collateral stored in a different/this contract needs to be transferred.
* @param amount Collateral amount in collateral token defined decimals.
*/
function _afterBurning(uint256 amount) internal virtual {}
/**
* @dev Hook that is called just before minting new tokens. To be used i.e.
* if the deposited amount is to be transferred from user to this contract.
* @param amount Collateral amount in collateral token defined decimals.
*/
function _beforeMinting(uint256 amount) internal virtual {}
/**
* @dev Hook that is called just after minting new tokens. To be used i.e.
* if the deposited amount is to be transferred to a different contract.
* @param amount Collateral amount in collateral token defined decimals.
*/
function _afterMinting(uint256 amount) internal virtual {}
/**
* @dev Calculate shares to mint based on the current share price and given amount.
* @param amount Collateral amount in collateral token defined decimals.
*/
function _calculateShares(uint256 amount) internal view returns (uint256) {
require(amount != 0, "amount is 0");
uint256 _totalSupply = totalSupply();
uint256 _totalValue = convertTo18(totalValue());
uint256 shares =
(_totalSupply == 0 || _totalValue == 0)
? amount
: amount.mul(_totalSupply).div(_totalValue);
return shares;
}
/// @dev Deposit incoming token and mint pool token i.e. shares.
function _deposit(uint256 amount) internal whenNotPaused {
uint256 shares = _calculateShares(convertTo18(amount));
_beforeMinting(amount);
_mint(_msgSender(), shares);
_afterMinting(amount);
emit Deposit(_msgSender(), shares, amount);
}
/// @dev Handle withdraw fee calculation and fee transfer to fee collector.
function _handleFee(uint256 shares) internal returns (uint256 _sharesAfterFee) {
if (withdrawFee() != 0) {
uint256 _fee = shares.mul(withdrawFee()).div(1e18);
_sharesAfterFee = shares.sub(_fee);
_transfer(_msgSender(), feeCollector(), _fee);
} else {
_sharesAfterFee = shares;
}
}
/// @dev Update pool reward of sender and receiver before transfer.
function _beforeTokenTransfer(
address from,
address to,
uint256 /* amount */
) internal override {
address poolRewards = controller.poolRewards(address(this));
if (poolRewards != address(0)) {
if (from != address(0)) {
IPoolRewards(poolRewards).updateReward(from);
}
if (to != address(0)) {
IPoolRewards(poolRewards).updateReward(to);
}
}
}
/// @dev Burns shares and returns the collateral value, after fee, of those.
function _withdraw(uint256 shares) internal whenNotShutdown {
require(shares != 0, "share is 0");
_beforeBurning(shares);
uint256 sharesAfterFee = _handleFee(shares);
uint256 amount =
convertFrom18(sharesAfterFee.mul(convertTo18(totalValue())).div(totalSupply()));
_burn(_msgSender(), sharesAfterFee);
_afterBurning(amount);
emit Withdraw(_msgSender(), shares, amount);
}
/// @dev Burns shares and returns the collateral value of those.
function _withdrawByStrategy(uint256 shares) internal {
require(shares != 0, "Withdraw must be greater than 0");
_beforeBurning(shares);
uint256 amount = convertFrom18(shares.mul(convertTo18(totalValue())).div(totalSupply()));
_burn(_msgSender(), shares);
_afterBurning(amount);
emit Withdraw(_msgSender(), shares, amount);
}
}
// File: contracts/interfaces/uniswap/IUniswapV2Router01.sol
pragma solidity 0.6.12;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountsOut(uint256 amountIn, address[] calldata path)
external
view
returns (uint256[] memory amounts);
function getAmountsIn(uint256 amountOut, address[] calldata path)
external
view
returns (uint256[] memory amounts);
}
// File: contracts/interfaces/uniswap/IUniswapV2Router02.sol
pragma solidity 0.6.12;
interface IUniswapV2Router02 is IUniswapV2Router01 {
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}
// File: contracts/interfaces/vesper/IStrategy.sol
pragma solidity 0.6.12;
interface IStrategy {
function rebalance() external;
function deposit(uint256 amount) external;
function beforeWithdraw() external;
function withdraw(uint256 amount) external;
function withdrawAll() external;
function isUpgradable() external view returns (bool);
function isReservedToken(address _token) external view returns (bool);
function token() external view returns (address);
function pool() external view returns (address);
function totalLocked() external view returns (uint256);
//Lifecycle functions
function pause() external;
function unpause() external;
}
// File: contracts/pools/VTokenBase.sol
pragma solidity 0.6.12;
abstract contract VTokenBase is PoolShareToken {
address internal constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
constructor(
string memory name,
string memory symbol,
address _token,
address _controller
) public PoolShareToken(name, symbol, _token, _controller) {
require(_controller != address(0), "Controller address is zero");
}
modifier onlyController() {
require(address(controller) == _msgSender(), "Caller is not the controller");
_;
}
function pause() external onlyController {
_pause();
}
function unpause() external onlyController {
_unpause();
}
function shutdown() external onlyController {
_shutdown();
}
function open() external onlyController {
_open();
}
/// @dev Approve strategy to spend collateral token and strategy token of pool.
function approveToken() external virtual onlyController {
address strategy = controller.strategy(address(this));
token.safeApprove(strategy, MAX_UINT_VALUE);
IERC20(IStrategy(strategy).token()).safeApprove(strategy, MAX_UINT_VALUE);
}
/// @dev Reset token approval of strategy. Called when updating strategy.
function resetApproval() external virtual onlyController {
address strategy = controller.strategy(address(this));
token.safeApprove(strategy, 0);
IERC20(IStrategy(strategy).token()).safeApprove(strategy, 0);
}
/**
* @dev Rebalance invested collateral to mitigate liquidation risk, if any.
* Behavior of rebalance is driven by risk parameters defined in strategy.
*/
function rebalance() external virtual {
IStrategy strategy = IStrategy(controller.strategy(address(this)));
strategy.rebalance();
}
/**
* @dev Convert given ERC20 token into collateral token via Uniswap
* @param _erc20 Token address
*/
function sweepErc20(address _erc20) external virtual {
_sweepErc20(_erc20);
}
/// @dev Returns collateral token locked in strategy
function tokenLocked() public view virtual returns (uint256) {
IStrategy strategy = IStrategy(controller.strategy(address(this)));
return strategy.totalLocked();
}
/// @dev Returns total value of vesper pool, in terms of collateral token
function totalValue() public view override returns (uint256) {
return tokenLocked().add(tokensHere());
}
/**
* @dev After burning hook, it will be called during withdrawal process.
* It will withdraw collateral from strategy and transfer it to user.
*/
function _afterBurning(uint256 _amount) internal override {
uint256 balanceHere = tokensHere();
if (balanceHere < _amount) {
_withdrawCollateral(_amount.sub(balanceHere));
balanceHere = tokensHere();
_amount = balanceHere < _amount ? balanceHere : _amount;
}
token.safeTransfer(_msgSender(), _amount);
}
/**
* @dev Before burning hook.
* Some actions, like resurface(), can impact share price and has to be called before withdraw.
*/
function _beforeBurning(
uint256 /* shares */
) internal override {
IStrategy strategy = IStrategy(controller.strategy(address(this)));
strategy.beforeWithdraw();
}
function _beforeMinting(uint256 amount) internal override {
token.safeTransferFrom(_msgSender(), address(this), amount);
}
function _withdrawCollateral(uint256 amount) internal virtual {
IStrategy strategy = IStrategy(controller.strategy(address(this)));
strategy.withdraw(amount);
}
function _sweepErc20(address _from) internal {
IStrategy strategy = IStrategy(controller.strategy(address(this)));
require(
_from != address(token) && _from != address(this) && !strategy.isReservedToken(_from),
"Not allowed to sweep"
);
IUniswapV2Router02 uniswapRouter = IUniswapV2Router02(controller.uniswapRouter());
uint256 amt = IERC20(_from).balanceOf(address(this));
IERC20(_from).safeApprove(address(uniswapRouter), amt);
address[] memory path;
if (address(token) == WETH) {
path = new address[](2);
path[0] = _from;
path[1] = address(token);
} else {
path = new address[](3);
path[0] = _from;
path[1] = WETH;
path[2] = address(token);
}
uniswapRouter.swapExactTokensForTokens(amt, 1, path, address(this), now + 30);
}
}
// File: contracts/interfaces/token/IToken.sol
pragma solidity 0.6.12;
interface TokenLike {
function approve(address, uint256) external returns (bool);
function balanceOf(address) external view returns (uint256);
function transfer(address, uint256) external returns (bool);
function transferFrom(
address,
address,
uint256
) external returns (bool);
function deposit() external payable;
function withdraw(uint256) external;
}
// File: contracts/pools/VETH.sol
pragma solidity 0.6.12;
contract VETH is VTokenBase {
TokenLike public immutable weth;
bool internal shouldDeposit = true;
constructor(address _controller)
public
VTokenBase("vETH Pool", "vETH", 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, _controller)
{
weth = TokenLike(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2);
}
/// @dev Handle incoming ETH to the contract address.
receive() external payable {
if (shouldDeposit) {
deposit();
}
}
/// @dev Burns tokens/shares and returns the ETH value, after fee, of those.
function withdrawETH(uint256 shares) external whenNotShutdown nonReentrant {
require(shares != 0, "Withdraw must be greater than 0");
_beforeBurning(shares);
uint256 sharesAfterFee = _handleFee(shares);
uint256 amount = sharesAfterFee.mul(totalValue()).div(totalSupply());
_burn(_msgSender(), sharesAfterFee);
uint256 balanceHere = tokensHere();
if (balanceHere < amount) {
_withdrawCollateral(amount.sub(balanceHere));
balanceHere = tokensHere();
amount = balanceHere < amount ? balanceHere : amount;
}
// Unwrap WETH to ETH
shouldDeposit = false;
weth.withdraw(amount);
shouldDeposit = true;
_msgSender().transfer(amount);
emit Withdraw(_msgSender(), shares, amount);
}
/**
* @dev Receives ETH and grants new tokens/shares to the sender depending
* on the value of pool's share.
*/
function deposit() public payable whenNotPaused nonReentrant {
uint256 shares = _calculateShares(msg.value);
// Wraps ETH in WETH
weth.deposit{value: msg.value}();
_mint(_msgSender(), shares);
}
}