Contract Name:
EarnVesperStrategy
Contract Source Code:
// 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";
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'
// 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) + 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
// solhint-disable-next-line max-line-length
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;
// 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");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(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");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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
// solhint-disable-next-line no-inline-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) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
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 removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) 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 swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
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 swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
* and `uint256` (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping(bytes32 => uint256) _indexes;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._indexes[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We read and store the value's index to prevent multiple reads from the same storage slot
uint256 valueIndex = set._indexes[value];
if (valueIndex != 0) {
// Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = valueIndex - 1;
uint256 lastIndex = set._values.length - 1;
if (lastIndex != toDeleteIndex) {
bytes32 lastvalue = set._values[lastIndex];
// Move the last value to the index where the value to delete is
set._values[toDeleteIndex] = lastvalue;
// Update the index for the moved value
set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
}
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the index for the deleted slot
delete set._indexes[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
return set._values[index];
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function _values(Set storage set) private view returns (bytes32[] memory) {
return set._values;
}
// Bytes32Set
struct Bytes32Set {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _add(set._inner, value);
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
return _remove(set._inner, value);
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
return _contains(set._inner, value);
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(Bytes32Set storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
return _at(set._inner, index);
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
return _values(set._inner);
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(uint160(value))));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint160(uint256(_at(set._inner, index))));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(AddressSet storage set) internal view returns (address[] memory) {
bytes32[] memory store = _values(set._inner);
address[] memory result;
assembly {
result := store
}
return result;
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
/**
* @dev Return the entire set in an array
*
* WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
* to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
* this function has an unbounded cost, and using it as part of a state-changing function may render the function
* uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
*/
function values(UintSet storage set) internal view returns (uint256[] memory) {
bytes32[] memory store = _values(set._inner);
uint256[] memory result;
assembly {
result := store
}
return result;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
/* solhint-disable func-name-mixedcase */
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
interface ISwapManager {
event OracleCreated(address indexed _sender, address indexed _newOracle, uint256 _period);
function N_DEX() external view returns (uint256);
function ROUTERS(uint256 i) external view returns (IUniswapV2Router02);
function bestOutputFixedInput(
address _from,
address _to,
uint256 _amountIn
)
external
view
returns (
address[] memory path,
uint256 amountOut,
uint256 rIdx
);
function bestPathFixedInput(
address _from,
address _to,
uint256 _amountIn,
uint256 _i
) external view returns (address[] memory path, uint256 amountOut);
function bestInputFixedOutput(
address _from,
address _to,
uint256 _amountOut
)
external
view
returns (
address[] memory path,
uint256 amountIn,
uint256 rIdx
);
function bestPathFixedOutput(
address _from,
address _to,
uint256 _amountOut,
uint256 _i
) external view returns (address[] memory path, uint256 amountIn);
function safeGetAmountsOut(
uint256 _amountIn,
address[] memory _path,
uint256 _i
) external view returns (uint256[] memory result);
function unsafeGetAmountsOut(
uint256 _amountIn,
address[] memory _path,
uint256 _i
) external view returns (uint256[] memory result);
function safeGetAmountsIn(
uint256 _amountOut,
address[] memory _path,
uint256 _i
) external view returns (uint256[] memory result);
function unsafeGetAmountsIn(
uint256 _amountOut,
address[] memory _path,
uint256 _i
) external view returns (uint256[] memory result);
function comparePathsFixedInput(
address[] memory pathA,
address[] memory pathB,
uint256 _amountIn,
uint256 _i
) external view returns (address[] memory path, uint256 amountOut);
function comparePathsFixedOutput(
address[] memory pathA,
address[] memory pathB,
uint256 _amountOut,
uint256 _i
) external view returns (address[] memory path, uint256 amountIn);
function ours(address a) external view returns (bool);
function oracleCount() external view returns (uint256);
function oracleAt(uint256 idx) external view returns (address);
function getOracle(
address _tokenA,
address _tokenB,
uint256 _period,
uint256 _i
) external view returns (address);
function createOrUpdateOracle(
address _tokenA,
address _tokenB,
uint256 _period,
uint256 _i
) external returns (address oracleAddr);
function consultForFree(
address _from,
address _to,
uint256 _amountIn,
uint256 _period,
uint256 _i
) external view returns (uint256 amountOut, uint256 lastUpdatedAt);
/// get the data we want and pay the gas to update
function consult(
address _from,
address _to,
uint256 _amountIn,
uint256 _period,
uint256 _i
)
external
returns (
uint256 amountOut,
uint256 lastUpdatedAt,
bool updated
);
function updateOracles() external returns (uint256 updated, uint256 expected);
function updateOracles(address[] memory _oracleAddrs) external returns (uint256 updated, uint256 expected);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "./IPoolRewards.sol";
interface IEarnDrip is IPoolRewards {
function rewardTokens(uint256 _index) external view returns (address);
function growToken() external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
interface IPoolRewards {
/// Emitted after reward added
event RewardAdded(address indexed rewardToken, uint256 reward, uint256 rewardDuration);
/// Emitted whenever any user claim rewards
event RewardPaid(address indexed user, address indexed rewardToken, uint256 reward);
/// Emitted after adding new rewards token into rewardTokens array
event RewardTokenAdded(address indexed rewardToken, address[] existingRewardTokens);
function claimReward(address) external;
function notifyRewardAmount(
address _rewardToken,
uint256 _rewardAmount,
uint256 _rewardDuration
) external;
function notifyRewardAmount(
address[] memory _rewardTokens,
uint256[] memory _rewardAmounts,
uint256[] memory _rewardDurations
) external;
function updateReward(address) external;
function claimable(address _account)
external
view
returns (address[] memory _rewardTokens, uint256[] memory _claimableAmounts);
function lastTimeRewardApplicable(address _rewardToken) external view returns (uint256);
function rewardForDuration()
external
view
returns (address[] memory _rewardTokens, uint256[] memory _rewardForDuration);
function rewardPerToken()
external
view
returns (address[] memory _rewardTokens, uint256[] memory _rewardPerTokenRate);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
interface IStrategy {
function rebalance() external;
function sweepERC20(address _fromToken) external;
function withdraw(uint256 _amount) external;
function feeCollector() external view returns (address);
function isReservedToken(address _token) external view returns (bool);
function keepers() external view returns (address[] memory);
function migrate(address _newStrategy) external;
function token() external view returns (address);
function totalValue() external view returns (uint256);
function totalValueCurrent() external returns (uint256);
function pool() external view returns (address);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
interface IVesperPool is IERC20 {
function deposit() external payable;
function deposit(uint256 _share) external;
function multiTransfer(address[] memory _recipients, uint256[] memory _amounts) external returns (bool);
function excessDebt(address _strategy) external view returns (uint256);
function permit(
address,
address,
uint256,
uint256,
uint8,
bytes32,
bytes32
) external;
function poolRewards() external returns (address);
function reportEarning(
uint256 _profit,
uint256 _loss,
uint256 _payback
) external;
function reportLoss(uint256 _loss) external;
function resetApproval() external;
function sweepERC20(address _fromToken) external;
function withdraw(uint256 _amount) external;
function withdrawETH(uint256 _amount) external;
function whitelistedWithdraw(uint256 _amount) external;
function governor() external view returns (address);
function keepers() external view returns (address[] memory);
function isKeeper(address _address) external view returns (bool);
function maintainers() external view returns (address[] memory);
function isMaintainer(address _address) external view returns (bool);
function feeCollector() external view returns (address);
function pricePerShare() external view returns (uint256);
function strategy(address _strategy)
external
view
returns (
bool _active,
uint256 _interestFee,
uint256 _debtRate,
uint256 _lastRebalance,
uint256 _totalDebt,
uint256 _totalLoss,
uint256 _totalProfit,
uint256 _debtRatio
);
function stopEverything() external view returns (bool);
function token() external view returns (IERC20);
function tokensHere() external view returns (uint256);
function totalDebtOf(address _strategy) external view returns (uint256);
function totalValue() external view returns (uint256);
function withdrawFee() external view returns (uint256);
// Function to get pricePerShare from V2 pools
function getPricePerShare() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "../interfaces/vesper/IEarnDrip.sol";
import "../interfaces/vesper/IVesperPool.sol";
import "./Strategy.sol";
abstract contract Earn is Strategy {
using SafeERC20 for IERC20;
address public immutable dripToken;
uint256 public dripPeriod = 48 hours;
uint256 public totalEarned; // accounting total stable coin earned. This amount is not reported to pool.
event DripPeriodUpdated(uint256 oldDripPeriod, uint256 newDripPeriod);
constructor(address _dripToken) {
require(_dripToken != address(0), "dripToken-zero");
dripToken = _dripToken;
}
/**
* @notice Update update period of distribution of earning done in one rebalance
* @dev _dripPeriod in seconds
*/
function updateDripPeriod(uint256 _dripPeriod) external onlyGovernor {
require(_dripPeriod != 0, "dripPeriod-zero");
require(_dripPeriod != dripPeriod, "same-dripPeriod");
emit DripPeriodUpdated(dripPeriod, _dripPeriod);
dripPeriod = _dripPeriod;
}
/// @dev Approves EarnDrip' Grow token to spend dripToken
function approveGrowToken() external onlyKeeper {
address _dripContract = IVesperPool(pool).poolRewards();
address _growPool = IEarnDrip(_dripContract).growToken();
// Checks that the Grow Pool supports dripToken as underlying
if (_growPool != address(0)) {
require(address(IVesperPool(_growPool).token()) == dripToken, "invalid-grow-pool");
IERC20(dripToken).safeApprove(_growPool, 0);
IERC20(dripToken).safeApprove(_growPool, MAX_UINT_VALUE);
}
}
/// @notice Converts excess collateral earned to drip token
function _convertCollateralToDrip() internal {
uint256 _collateralAmount = collateralToken.balanceOf(address(this));
_convertCollateralToDrip(_collateralAmount);
}
function _convertCollateralToDrip(uint256 _collateralAmount) internal {
if (_collateralAmount != 0) {
uint256 minAmtOut =
(swapSlippage != 10000)
? _calcAmtOutAfterSlippage(
_getOracleRate(_simpleOraclePath(address(collateralToken), dripToken), _collateralAmount),
swapSlippage
)
: 1;
_safeSwap(address(collateralToken), dripToken, _collateralAmount, minAmtOut);
}
}
/**
* @notice Send this earning to drip contract.
*/
function _forwardEarning() internal virtual {
(, uint256 _interestFee, , , , , , ) = IVesperPool(pool).strategy(address(this));
address _dripContract = IVesperPool(pool).poolRewards();
uint256 _earned = IERC20(dripToken).balanceOf(address(this));
if (_earned != 0) {
// Fetches which rewardToken collects the drip
address _growPool = IEarnDrip(_dripContract).growToken();
totalEarned += _earned;
// Checks that the Grow Pool supports dripToken as underlying
if (_growPool != address(0) && address(IVesperPool(_growPool).token()) == dripToken) {
uint256 _growPoolBalanceBefore = IERC20(_growPool).balanceOf(address(this));
IVesperPool(_growPool).deposit(_earned);
uint256 _growPoolShares = IERC20(_growPool).balanceOf(address(this)) - _growPoolBalanceBefore;
uint256 _fee = (_growPoolShares * _interestFee) / 10000;
if (_fee != 0) {
IERC20(_growPool).safeTransfer(feeCollector, _fee);
_growPoolShares -= _fee;
}
IERC20(_growPool).safeTransfer(_dripContract, _growPoolShares);
IEarnDrip(_dripContract).notifyRewardAmount(_growPool, _growPoolShares, dripPeriod);
} else {
// If no growToken is set for dripContract, forward the dripToken directly
// Minus interestFee that goes to feeCollector
uint256 _fee = (_earned * _interestFee) / 10000;
if (_fee != 0) {
IERC20(dripToken).safeTransfer(feeCollector, _fee);
_earned -= _fee;
}
IERC20(dripToken).safeTransfer(_dripContract, _earned);
IEarnDrip(_dripContract).notifyRewardAmount(dripToken, _earned, dripPeriod);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "../dependencies/openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "../interfaces/bloq/ISwapManager.sol";
import "../interfaces/vesper/IStrategy.sol";
import "../interfaces/vesper/IVesperPool.sol";
abstract contract Strategy is IStrategy, Context {
using SafeERC20 for IERC20;
using EnumerableSet for EnumerableSet.AddressSet;
address internal constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
uint256 internal constant MAX_UINT_VALUE = type(uint256).max;
// solhint-disable-next-line var-name-mixedcase
address internal WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
IERC20 public immutable collateralToken;
address public receiptToken;
address public immutable override pool;
address public override feeCollector;
ISwapManager public swapManager;
uint256 public oraclePeriod = 3600; // 1h
uint256 public oracleRouterIdx = 0; // Uniswap V2
uint256 public swapSlippage = 10000; // 100% Don't use oracles by default
EnumerableSet.AddressSet private _keepers;
event UpdatedFeeCollector(address indexed previousFeeCollector, address indexed newFeeCollector);
event UpdatedSwapManager(address indexed previousSwapManager, address indexed newSwapManager);
event UpdatedSwapSlippage(uint256 oldSwapSlippage, uint256 newSwapSlippage);
event UpdatedOracleConfig(uint256 oldPeriod, uint256 newPeriod, uint256 oldRouterIdx, uint256 newRouterIdx);
constructor(
address _pool,
address _swapManager,
address _receiptToken
) {
require(_pool != address(0), "pool-address-is-zero");
require(_swapManager != address(0), "sm-address-is-zero");
swapManager = ISwapManager(_swapManager);
pool = _pool;
collateralToken = IVesperPool(_pool).token();
receiptToken = _receiptToken;
require(_keepers.add(_msgSender()), "add-keeper-failed");
}
modifier onlyGovernor {
require(_msgSender() == IVesperPool(pool).governor(), "caller-is-not-the-governor");
_;
}
modifier onlyKeeper() {
require(_keepers.contains(_msgSender()), "caller-is-not-a-keeper");
_;
}
modifier onlyPool() {
require(_msgSender() == pool, "caller-is-not-vesper-pool");
_;
}
/**
* @notice Add given address in keepers list.
* @param _keeperAddress keeper address to add.
*/
function addKeeper(address _keeperAddress) external onlyGovernor {
require(_keepers.add(_keeperAddress), "add-keeper-failed");
}
/// @notice Return list of keepers
function keepers() external view override returns (address[] memory) {
return _keepers.values();
}
/**
* @notice Migrate all asset and vault ownership,if any, to new strategy
* @dev _beforeMigration hook can be implemented in child strategy to do extra steps.
* @param _newStrategy Address of new strategy
*/
function migrate(address _newStrategy) external virtual override onlyPool {
require(_newStrategy != address(0), "new-strategy-address-is-zero");
require(IStrategy(_newStrategy).pool() == pool, "not-valid-new-strategy");
_beforeMigration(_newStrategy);
IERC20(receiptToken).safeTransfer(_newStrategy, IERC20(receiptToken).balanceOf(address(this)));
collateralToken.safeTransfer(_newStrategy, collateralToken.balanceOf(address(this)));
}
/**
* @notice Remove given address from keepers list.
* @param _keeperAddress keeper address to remove.
*/
function removeKeeper(address _keeperAddress) external onlyGovernor {
require(_keepers.remove(_keeperAddress), "remove-keeper-failed");
}
/**
* @notice Update fee collector
* @param _feeCollector fee collector address
*/
function updateFeeCollector(address _feeCollector) external onlyGovernor {
require(_feeCollector != address(0), "fee-collector-address-is-zero");
require(_feeCollector != feeCollector, "fee-collector-is-same");
emit UpdatedFeeCollector(feeCollector, _feeCollector);
feeCollector = _feeCollector;
}
/**
* @notice Update swap manager address
* @param _swapManager swap manager address
*/
function updateSwapManager(address _swapManager) external onlyGovernor {
require(_swapManager != address(0), "sm-address-is-zero");
require(_swapManager != address(swapManager), "sm-is-same");
emit UpdatedSwapManager(address(swapManager), _swapManager);
swapManager = ISwapManager(_swapManager);
}
function updateSwapSlippage(uint256 _newSwapSlippage) external onlyGovernor {
require(_newSwapSlippage <= 10000, "invalid-slippage-value");
emit UpdatedSwapSlippage(swapSlippage, _newSwapSlippage);
swapSlippage = _newSwapSlippage;
}
function updateOracleConfig(uint256 _newPeriod, uint256 _newRouterIdx) external onlyGovernor {
require(_newRouterIdx < swapManager.N_DEX(), "invalid-router-index");
if (_newPeriod == 0) _newPeriod = oraclePeriod;
require(_newPeriod > 59, "invalid-oracle-period");
emit UpdatedOracleConfig(oraclePeriod, _newPeriod, oracleRouterIdx, _newRouterIdx);
oraclePeriod = _newPeriod;
oracleRouterIdx = _newRouterIdx;
}
/// @dev Approve all required tokens
function approveToken() external onlyKeeper {
_approveToken(0);
_approveToken(MAX_UINT_VALUE);
}
function setupOracles() external onlyKeeper {
_setupOracles();
}
/**
* @dev Withdraw collateral token from lending pool.
* @param _amount Amount of collateral token
*/
function withdraw(uint256 _amount) external override onlyPool {
_withdraw(_amount);
}
/**
* @dev Rebalance profit, loss and investment of this strategy
*/
function rebalance() external virtual override onlyKeeper {
(uint256 _profit, uint256 _loss, uint256 _payback) = _generateReport();
IVesperPool(pool).reportEarning(_profit, _loss, _payback);
_reinvest();
}
/**
* @dev sweep given token to feeCollector of strategy
* @param _fromToken token address to sweep
*/
function sweepERC20(address _fromToken) external override onlyKeeper {
require(feeCollector != address(0), "fee-collector-not-set");
require(_fromToken != address(collateralToken), "not-allowed-to-sweep-collateral");
require(!isReservedToken(_fromToken), "not-allowed-to-sweep");
if (_fromToken == ETH) {
Address.sendValue(payable(feeCollector), address(this).balance);
} else {
uint256 _amount = IERC20(_fromToken).balanceOf(address(this));
IERC20(_fromToken).safeTransfer(feeCollector, _amount);
}
}
/// @notice Returns address of token correspond to collateral token
function token() external view override returns (address) {
return receiptToken;
}
/**
* @notice Calculate total value of asset under management
* @dev Report total value in collateral token
*/
function totalValue() public view virtual override returns (uint256 _value);
/**
* @notice Calculate total value of asset under management (in real-time)
* @dev Report total value in collateral token
*/
function totalValueCurrent() external virtual override returns (uint256) {
return totalValue();
}
/// @notice Check whether given token is reserved or not. Reserved tokens are not allowed to sweep.
function isReservedToken(address _token) public view virtual override returns (bool);
/**
* @notice some strategy may want to prepare before doing migration.
Example In Maker old strategy want to give vault ownership to new strategy
* @param _newStrategy .
*/
function _beforeMigration(address _newStrategy) internal virtual;
/**
* @notice Generate report for current profit and loss. Also liquidate asset to payback
* excess debt, if any.
* @return _profit Calculate any realized profit and convert it to collateral, if not already.
* @return _loss Calculate any loss that strategy has made on investment. Convert into collateral token.
* @return _payback If strategy has any excess debt, we have to liquidate asset to payback excess debt.
*/
function _generateReport()
internal
virtual
returns (
uint256 _profit,
uint256 _loss,
uint256 _payback
)
{
uint256 _excessDebt = IVesperPool(pool).excessDebt(address(this));
uint256 _totalDebt = IVesperPool(pool).totalDebtOf(address(this));
_profit = _realizeProfit(_totalDebt);
_loss = _realizeLoss(_totalDebt);
_payback = _liquidate(_excessDebt);
}
function _calcAmtOutAfterSlippage(uint256 _amount, uint256 _slippage) internal pure returns (uint256) {
return (_amount * (10000 - _slippage)) / (10000);
}
function _simpleOraclePath(address _from, address _to) internal view returns (address[] memory path) {
if (_from == WETH || _to == WETH) {
path = new address[](2);
path[0] = _from;
path[1] = _to;
} else {
path = new address[](3);
path[0] = _from;
path[1] = WETH;
path[2] = _to;
}
}
function _consultOracle(
address _from,
address _to,
uint256 _amt
) internal returns (uint256, bool) {
for (uint256 i = 0; i < swapManager.N_DEX(); i++) {
(bool _success, bytes memory _returnData) =
address(swapManager).call(
abi.encodePacked(swapManager.consult.selector, abi.encode(_from, _to, _amt, oraclePeriod, i))
);
if (_success) {
(uint256 rate, uint256 lastUpdate, ) = abi.decode(_returnData, (uint256, uint256, bool));
if ((lastUpdate > (block.timestamp - oraclePeriod)) && (rate != 0)) return (rate, true);
return (0, false);
}
}
return (0, false);
}
function _getOracleRate(address[] memory path, uint256 _amountIn) internal returns (uint256 amountOut) {
require(path.length > 1, "invalid-oracle-path");
amountOut = _amountIn;
bool isValid;
for (uint256 i = 0; i < path.length - 1; i++) {
(amountOut, isValid) = _consultOracle(path[i], path[i + 1], amountOut);
require(isValid, "invalid-oracle-rate");
}
}
/**
* @notice Safe swap via Uniswap / Sushiswap (better rate of the two)
* @dev There are many scenarios when token swap via Uniswap can fail, so this
* method will wrap Uniswap call in a 'try catch' to make it fail safe.
* however, this method will throw minAmountOut is not met
* @param _from address of from token
* @param _to address of to token
* @param _amountIn Amount to be swapped
* @param _minAmountOut minimum amount out
*/
function _safeSwap(
address _from,
address _to,
uint256 _amountIn,
uint256 _minAmountOut
) internal {
(address[] memory path, uint256 amountOut, uint256 rIdx) =
swapManager.bestOutputFixedInput(_from, _to, _amountIn);
if (_minAmountOut == 0) _minAmountOut = 1;
if (amountOut != 0) {
swapManager.ROUTERS(rIdx).swapExactTokensForTokens(
_amountIn,
_minAmountOut,
path,
address(this),
block.timestamp
);
}
}
// These methods can be implemented by the inheriting strategy.
/* solhint-disable no-empty-blocks */
function _claimRewardsAndConvertTo(address _toToken) internal virtual {}
/**
* @notice Set up any oracles that are needed for this strategy.
*/
function _setupOracles() internal virtual {}
/* solhint-enable */
// These methods must be implemented by the inheriting strategy
function _withdraw(uint256 _amount) internal virtual;
function _approveToken(uint256 _amount) internal virtual;
/**
* @notice Withdraw collateral to payback excess debt in pool.
* @param _excessDebt Excess debt of strategy in collateral token
* @return _payback amount in collateral token. Usually it is equal to excess debt.
*/
function _liquidate(uint256 _excessDebt) internal virtual returns (uint256 _payback);
/**
* @notice Calculate earning and withdraw/convert it into collateral token.
* @param _totalDebt Total collateral debt of this strategy
* @return _profit Profit in collateral token
*/
function _realizeProfit(uint256 _totalDebt) internal virtual returns (uint256 _profit);
/**
* @notice Calculate loss
* @param _totalDebt Total collateral debt of this strategy
* @return _loss Realized loss in collateral token
*/
function _realizeLoss(uint256 _totalDebt) internal virtual returns (uint256 _loss);
/**
* @notice Reinvest collateral.
* @dev Once we file report back in pool, we might have some collateral in hand
* which we want to reinvest aka deposit in lender/provider.
*/
function _reinvest() internal virtual;
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "../../interfaces/vesper/IVesperPool.sol";
import "../Strategy.sol";
/// @title This Strategy will deposit collateral token in a Vesper Grow Pool
abstract contract VesperStrategy is Strategy {
using SafeERC20 for IERC20;
// solhint-disable-next-line var-name-mixedcase
string public NAME;
string public constant VERSION = "4.0.1";
address internal immutable vsp;
IVesperPool internal immutable vToken;
constructor(
address _pool,
address _swapManager,
address _receiptToken,
address _vsp,
string memory _name
) Strategy(_pool, _swapManager, _receiptToken) {
require(_receiptToken != address(0), "vToken-address-is-zero");
vToken = IVesperPool(_receiptToken);
NAME = _name;
vsp = _vsp;
}
/**
* @notice Calculate total value using underlying vToken
* @dev Report total value in collateral token
*/
function totalValue() public view override returns (uint256 _totalValue) {
_totalValue = _getCollateralBalance();
}
function isReservedToken(address _token) public view override returns (bool) {
return _token == address(vToken);
}
/// @notice Approve all required tokens
function _approveToken(uint256 _amount) internal virtual override {
collateralToken.safeApprove(pool, _amount);
collateralToken.safeApprove(address(vToken), _amount);
for (uint256 i = 0; i < swapManager.N_DEX(); i++) {
IERC20(vsp).safeApprove(address(swapManager.ROUTERS(i)), _amount);
}
}
/**
* @notice Before migration hook.
* @param _newStrategy Address of new strategy.
*/
//solhint-disable-next-line no-empty-blocks
function _beforeMigration(address _newStrategy) internal override {}
/// @notice Withdraw collateral to payback excess debt
function _liquidate(uint256 _excessDebt) internal override returns (uint256 _payback) {
if (_excessDebt != 0) {
_payback = _safeWithdraw(_excessDebt);
}
}
/**
* @notice Calculate earning and withdraw it from Vesper Grow.
* @param _totalDebt Total collateral debt of this strategy
* @return profit in collateral token
*/
function _realizeProfit(uint256 _totalDebt) internal virtual override returns (uint256) {
_claimRewardsAndConvertTo(address(collateralToken));
uint256 _collateralBalance = _getCollateralBalance();
if (_collateralBalance > _totalDebt) {
_withdrawHere(_collateralBalance - _totalDebt);
}
return collateralToken.balanceOf(address(this));
}
/// @notice Claim VSP rewards in underlying Grow Pool, if any
function _claimRewardsAndConvertTo(address _toToken) internal virtual override {
uint256 _vspAmount = IERC20(vsp).balanceOf(address(this));
if (_vspAmount != 0) {
_safeSwap(vsp, _toToken, _vspAmount, 1);
}
}
/**
* @notice Calculate realized loss.
* @return _loss Realized loss in collateral token
*/
function _realizeLoss(uint256 _totalDebt) internal view override returns (uint256 _loss) {
uint256 _collateralBalance = _getCollateralBalance();
if (_collateralBalance < _totalDebt) {
_loss = _totalDebt - _collateralBalance;
}
}
/// @notice Deposit collateral in Vesper Grow
function _reinvest() internal virtual override {
uint256 _collateralBalance = collateralToken.balanceOf(address(this));
if (_collateralBalance != 0) {
vToken.deposit(_collateralBalance);
}
}
/// @dev Withdraw collateral and transfer it to pool
function _withdraw(uint256 _amount) internal override {
_safeWithdraw(_amount);
collateralToken.safeTransfer(pool, collateralToken.balanceOf(address(this)));
}
/**
* @notice Safe withdraw will make sure to check asking amount against available amount.
* @param _amount Amount of collateral to withdraw.
* @return Actual collateral withdrawn
*/
function _safeWithdraw(uint256 _amount) internal returns (uint256) {
uint256 _collateralBalance = _getCollateralBalance();
// Get minimum of _amount and _collateralBalance
return _withdrawHere(_amount < _collateralBalance ? _amount : _collateralBalance);
}
/// @dev Withdraw collateral here. Do not transfer to pool
function _withdrawHere(uint256 _amount) internal returns (uint256) {
uint256 _collateralBefore = collateralToken.balanceOf(address(this));
vToken.whitelistedWithdraw(_convertToShares(_amount));
return collateralToken.balanceOf(address(this)) - _collateralBefore;
}
/// @dev Gets collateral balance deposited into Vesper Grow Pool
function _getCollateralBalance() internal view returns (uint256) {
uint256 _totalSupply = vToken.totalSupply();
// avoids division by zero error when pool is empty
return (_totalSupply != 0) ? (vToken.totalValue() * vToken.balanceOf(address(this))) / _totalSupply : 0;
}
/// @dev Converts a collateral amount in its relative shares for Vesper Grow Pool
function _convertToShares(uint256 _collateralAmount) internal view returns (uint256) {
uint256 _totalValue = vToken.totalValue();
return (_totalValue != 0) ? (_collateralAmount * vToken.totalSupply()) / _totalValue : 0;
}
}
// SPDX-License-Identifier: MIT
pragma solidity 0.8.3;
import "../../Earn.sol";
import "../VesperStrategy.sol";
import "../../../interfaces/vesper/IVesperPool.sol";
/// @title This Earn strategy will deposit collateral token in a Vesper Grow Pool
/// and converts the yield to another Drip Token
// solhint-disable no-empty-blocks
contract EarnVesperStrategy is VesperStrategy, Earn {
using SafeERC20 for IERC20;
constructor(
address _pool,
address _swapManager,
address _receiptToken,
address _dripToken,
address _vsp,
string memory _name
) VesperStrategy(_pool, _swapManager, _receiptToken, _vsp, _name) Earn(_dripToken) {}
/// @notice Approve all required tokens
function _approveToken(uint256 _amount) internal virtual override(VesperStrategy, Strategy) {
collateralToken.safeApprove(pool, _amount);
collateralToken.safeApprove(address(vToken), _amount);
for (uint256 i = 0; i < swapManager.N_DEX(); i++) {
IERC20(vsp).safeApprove(address(swapManager.ROUTERS(i)), _amount);
collateralToken.safeApprove(address(swapManager.ROUTERS(i)), _amount);
}
}
/**
* @notice Calculate earning and withdraw it from Vesper Grow.
* @param _totalDebt Total collateral debt of this strategy
* @return profit in collateral token
*/
function _realizeProfit(uint256 _totalDebt) internal virtual override(VesperStrategy, Strategy) returns (uint256) {
_claimRewardsAndConvertTo(address(dripToken));
uint256 _collateralBalance = _getCollateralBalance();
if (_collateralBalance > _totalDebt) {
_withdrawHere(_collateralBalance - _totalDebt);
}
_convertCollateralToDrip();
_forwardEarning();
return 0;
}
/// @notice Claim VSP rewards in underlying Grow Pool, if any
function _claimRewardsAndConvertTo(address _toToken) internal virtual override(VesperStrategy, Strategy) {
VesperStrategy._claimRewardsAndConvertTo(_toToken);
}
}