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ERC-20
Add Token to MetaMask (Web3)Overview
Max Total Supply
1,161.989754 ERC20 ***
Holders
3
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 6 Decimals)
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| # | Exchange | Pair | Price | 24H Volume | % Volume |
|---|
Contract Name:
AaveV3Lender
Compiler Version
v0.8.18+commit.87f61d96
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2024-03-07
*/
// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.18;
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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);
/**
* @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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount) external returns (bool);
}
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// OpenZeppelin Contracts (last updated v4.9.4) (utils/Context.sol)
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
function _contextSuffixLength() internal view virtual returns (uint256) {
return 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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* The default value of {decimals} is 18. To change this, you should override
* this function so it returns a different value.
*
* We have followed general OpenZeppelin Contracts guidelines: functions revert
* instead returning `false` on failure. This behavior is nonetheless
* conventional and does not conflict with the expectations of ERC20
* applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20, IERC20Metadata {
mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* All two of these values are immutable: they can only be set once during
* construction.
*/
constructor(string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5.05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the default value returned by this function, unless
* it's overridden.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view virtual override returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, 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}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, 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}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, spender) + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* This internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(address from, address to, uint256 amount) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_balances[account] += amount;
}
emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_totalSupply -= amount;
}
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - amount);
}
}
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
/**
* @dev Hook that is called after any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* has been transferred to `to`.
* - when `from` is zero, `amount` tokens have been minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}
// TokenizedStrategy interface used for internal view delegateCalls.
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC4626.sol)
/**
* @dev Interface of the ERC4626 "Tokenized Vault Standard", as defined in
* https://eips.ethereum.org/EIPS/eip-4626[ERC-4626].
*
* _Available since v4.7._
*/
interface IERC4626 is IERC20, IERC20Metadata {
event Deposit(address indexed sender, address indexed owner, uint256 assets, uint256 shares);
event Withdraw(
address indexed sender,
address indexed receiver,
address indexed owner,
uint256 assets,
uint256 shares
);
/**
* @dev Returns the address of the underlying token used for the Vault for accounting, depositing, and withdrawing.
*
* - MUST be an ERC-20 token contract.
* - MUST NOT revert.
*/
function asset() external view returns (address assetTokenAddress);
/**
* @dev Returns the total amount of the underlying asset that is “managed” by Vault.
*
* - SHOULD include any compounding that occurs from yield.
* - MUST be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT revert.
*/
function totalAssets() external view returns (uint256 totalManagedAssets);
/**
* @dev Returns the amount of shares that the Vault would exchange for the amount of assets provided, in an ideal
* scenario where all the conditions are met.
*
* - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT show any variations depending on the caller.
* - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
* - MUST NOT revert.
*
* NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
* “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
* from.
*/
function convertToShares(uint256 assets) external view returns (uint256 shares);
/**
* @dev Returns the amount of assets that the Vault would exchange for the amount of shares provided, in an ideal
* scenario where all the conditions are met.
*
* - MUST NOT be inclusive of any fees that are charged against assets in the Vault.
* - MUST NOT show any variations depending on the caller.
* - MUST NOT reflect slippage or other on-chain conditions, when performing the actual exchange.
* - MUST NOT revert.
*
* NOTE: This calculation MAY NOT reflect the “per-user” price-per-share, and instead should reflect the
* “average-user’s” price-per-share, meaning what the average user should expect to see when exchanging to and
* from.
*/
function convertToAssets(uint256 shares) external view returns (uint256 assets);
/**
* @dev Returns the maximum amount of the underlying asset that can be deposited into the Vault for the receiver,
* through a deposit call.
*
* - MUST return a limited value if receiver is subject to some deposit limit.
* - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of assets that may be deposited.
* - MUST NOT revert.
*/
function maxDeposit(address receiver) external view returns (uint256 maxAssets);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their deposit at the current block, given
* current on-chain conditions.
*
* - MUST return as close to and no more than the exact amount of Vault shares that would be minted in a deposit
* call in the same transaction. I.e. deposit should return the same or more shares as previewDeposit if called
* in the same transaction.
* - MUST NOT account for deposit limits like those returned from maxDeposit and should always act as though the
* deposit would be accepted, regardless if the user has enough tokens approved, etc.
* - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToShares and previewDeposit SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by depositing.
*/
function previewDeposit(uint256 assets) external view returns (uint256 shares);
/**
* @dev Mints shares Vault shares to receiver by depositing exactly amount of underlying tokens.
*
* - MUST emit the Deposit event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* deposit execution, and are accounted for during deposit.
* - MUST revert if all of assets cannot be deposited (due to deposit limit being reached, slippage, the user not
* approving enough underlying tokens to the Vault contract, etc).
*
* NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
*/
function deposit(uint256 assets, address receiver) external returns (uint256 shares);
/**
* @dev Returns the maximum amount of the Vault shares that can be minted for the receiver, through a mint call.
* - MUST return a limited value if receiver is subject to some mint limit.
* - MUST return 2 ** 256 - 1 if there is no limit on the maximum amount of shares that may be minted.
* - MUST NOT revert.
*/
function maxMint(address receiver) external view returns (uint256 maxShares);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their mint at the current block, given
* current on-chain conditions.
*
* - MUST return as close to and no fewer than the exact amount of assets that would be deposited in a mint call
* in the same transaction. I.e. mint should return the same or fewer assets as previewMint if called in the
* same transaction.
* - MUST NOT account for mint limits like those returned from maxMint and should always act as though the mint
* would be accepted, regardless if the user has enough tokens approved, etc.
* - MUST be inclusive of deposit fees. Integrators should be aware of the existence of deposit fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToAssets and previewMint SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by minting.
*/
function previewMint(uint256 shares) external view returns (uint256 assets);
/**
* @dev Mints exactly shares Vault shares to receiver by depositing amount of underlying tokens.
*
* - MUST emit the Deposit event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the mint
* execution, and are accounted for during mint.
* - MUST revert if all of shares cannot be minted (due to deposit limit being reached, slippage, the user not
* approving enough underlying tokens to the Vault contract, etc).
*
* NOTE: most implementations will require pre-approval of the Vault with the Vault’s underlying asset token.
*/
function mint(uint256 shares, address receiver) external returns (uint256 assets);
/**
* @dev Returns the maximum amount of the underlying asset that can be withdrawn from the owner balance in the
* Vault, through a withdraw call.
*
* - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
* - MUST NOT revert.
*/
function maxWithdraw(address owner) external view returns (uint256 maxAssets);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their withdrawal at the current block,
* given current on-chain conditions.
*
* - MUST return as close to and no fewer than the exact amount of Vault shares that would be burned in a withdraw
* call in the same transaction. I.e. withdraw should return the same or fewer shares as previewWithdraw if
* called
* in the same transaction.
* - MUST NOT account for withdrawal limits like those returned from maxWithdraw and should always act as though
* the withdrawal would be accepted, regardless if the user has enough shares, etc.
* - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToShares and previewWithdraw SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by depositing.
*/
function previewWithdraw(uint256 assets) external view returns (uint256 shares);
/**
* @dev Burns shares from owner and sends exactly assets of underlying tokens to receiver.
*
* - MUST emit the Withdraw event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* withdraw execution, and are accounted for during withdraw.
* - MUST revert if all of assets cannot be withdrawn (due to withdrawal limit being reached, slippage, the owner
* not having enough shares, etc).
*
* Note that some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
* Those methods should be performed separately.
*/
function withdraw(uint256 assets, address receiver, address owner) external returns (uint256 shares);
/**
* @dev Returns the maximum amount of Vault shares that can be redeemed from the owner balance in the Vault,
* through a redeem call.
*
* - MUST return a limited value if owner is subject to some withdrawal limit or timelock.
* - MUST return balanceOf(owner) if owner is not subject to any withdrawal limit or timelock.
* - MUST NOT revert.
*/
function maxRedeem(address owner) external view returns (uint256 maxShares);
/**
* @dev Allows an on-chain or off-chain user to simulate the effects of their redeemption at the current block,
* given current on-chain conditions.
*
* - MUST return as close to and no more than the exact amount of assets that would be withdrawn in a redeem call
* in the same transaction. I.e. redeem should return the same or more assets as previewRedeem if called in the
* same transaction.
* - MUST NOT account for redemption limits like those returned from maxRedeem and should always act as though the
* redemption would be accepted, regardless if the user has enough shares, etc.
* - MUST be inclusive of withdrawal fees. Integrators should be aware of the existence of withdrawal fees.
* - MUST NOT revert.
*
* NOTE: any unfavorable discrepancy between convertToAssets and previewRedeem SHOULD be considered slippage in
* share price or some other type of condition, meaning the depositor will lose assets by redeeming.
*/
function previewRedeem(uint256 shares) external view returns (uint256 assets);
/**
* @dev Burns exactly shares from owner and sends assets of underlying tokens to receiver.
*
* - MUST emit the Withdraw event.
* - MAY support an additional flow in which the underlying tokens are owned by the Vault contract before the
* redeem execution, and are accounted for during redeem.
* - MUST revert if all of shares cannot be redeemed (due to withdrawal limit being reached, slippage, the owner
* not having enough shares, etc).
*
* NOTE: some implementations will require pre-requesting to the Vault before a withdrawal may be performed.
* Those methods should be performed separately.
*/
function redeem(uint256 shares, address receiver, address owner) external returns (uint256 assets);
}
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*
* ==== Security Considerations
*
* There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
* expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
* considered as an intention to spend the allowance in any specific way. The second is that because permits have
* built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
* take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
* generally recommended is:
*
* ```solidity
* function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
* try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
* doThing(..., value);
* }
*
* function doThing(..., uint256 value) public {
* token.safeTransferFrom(msg.sender, address(this), value);
* ...
* }
* ```
*
* Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
* `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
* {SafeERC20-safeTransferFrom}).
*
* Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
* contracts should have entry points that don't rely on permit.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*
* CAUTION: See Security Considerations above.
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// Interface that implements the 4626 standard and the implementation functions
interface ITokenizedStrategy is IERC4626, IERC20Permit {
/*//////////////////////////////////////////////////////////////
EVENTS
//////////////////////////////////////////////////////////////*/
event StrategyShutdown();
event NewTokenizedStrategy(
address indexed strategy,
address indexed asset,
string apiVersion
);
event Reported(
uint256 profit,
uint256 loss,
uint256 protocolFees,
uint256 performanceFees
);
event UpdatePerformanceFeeRecipient(
address indexed newPerformanceFeeRecipient
);
event UpdateKeeper(address indexed newKeeper);
event UpdatePerformanceFee(uint16 newPerformanceFee);
event UpdateManagement(address indexed newManagement);
event UpdateEmergencyAdmin(address indexed newEmergencyAdmin);
event UpdateProfitMaxUnlockTime(uint256 newProfitMaxUnlockTime);
event UpdatePendingManagement(address indexed newPendingManagement);
/*//////////////////////////////////////////////////////////////
INITIALIZATION
//////////////////////////////////////////////////////////////*/
function initialize(
address _asset,
string memory _name,
address _management,
address _performanceFeeRecipient,
address _keeper
) external;
/*//////////////////////////////////////////////////////////////
NON-STANDARD 4626 OPTIONS
//////////////////////////////////////////////////////////////*/
function withdraw(
uint256 assets,
address receiver,
address owner,
uint256 maxLoss
) external returns (uint256);
function redeem(
uint256 shares,
address receiver,
address owner,
uint256 maxLoss
) external returns (uint256);
/*//////////////////////////////////////////////////////////////
MODIFIER HELPERS
//////////////////////////////////////////////////////////////*/
function requireManagement(address _sender) external view;
function requireKeeperOrManagement(address _sender) external view;
function requireEmergencyAuthorized(address _sender) external view;
/*//////////////////////////////////////////////////////////////
KEEPERS FUNCTIONS
//////////////////////////////////////////////////////////////*/
function tend() external;
function report() external returns (uint256 _profit, uint256 _loss);
/*//////////////////////////////////////////////////////////////
CONSTANTS
//////////////////////////////////////////////////////////////*/
function MAX_FEE() external view returns (uint16);
function FACTORY() external view returns (address);
/*//////////////////////////////////////////////////////////////
GETTERS
//////////////////////////////////////////////////////////////*/
function apiVersion() external view returns (string memory);
function pricePerShare() external view returns (uint256);
function management() external view returns (address);
function pendingManagement() external view returns (address);
function keeper() external view returns (address);
function emergencyAdmin() external view returns (address);
function performanceFee() external view returns (uint16);
function performanceFeeRecipient() external view returns (address);
function fullProfitUnlockDate() external view returns (uint256);
function profitUnlockingRate() external view returns (uint256);
function profitMaxUnlockTime() external view returns (uint256);
function lastReport() external view returns (uint256);
function isShutdown() external view returns (bool);
function unlockedShares() external view returns (uint256);
/*//////////////////////////////////////////////////////////////
SETTERS
//////////////////////////////////////////////////////////////*/
function setPendingManagement(address) external;
function acceptManagement() external;
function setKeeper(address _keeper) external;
function setEmergencyAdmin(address _emergencyAdmin) external;
function setPerformanceFee(uint16 _performanceFee) external;
function setPerformanceFeeRecipient(
address _performanceFeeRecipient
) external;
function setProfitMaxUnlockTime(uint256 _profitMaxUnlockTime) external;
function shutdownStrategy() external;
function emergencyWithdraw(uint256 _amount) external;
}
/**
* @title YearnV3 Base Strategy
* @author yearn.finance
* @notice
* BaseStrategy implements all of the required functionality to
* seamlessly integrate with the `TokenizedStrategy` implementation contract
* allowing anyone to easily build a fully permissionless ERC-4626 compliant
* Vault by inheriting this contract and overriding three simple functions.
* It utilizes an immutable proxy pattern that allows the BaseStrategy
* to remain simple and small. All standard logic is held within the
* `TokenizedStrategy` and is reused over any n strategies all using the
* `fallback` function to delegatecall the implementation so that strategists
* can only be concerned with writing their strategy specific code.
*
* This contract should be inherited and the three main abstract methods
* `_deployFunds`, `_freeFunds` and `_harvestAndReport` implemented to adapt
* the Strategy to the particular needs it has to generate yield. There are
* other optional methods that can be implemented to further customize
* the strategy if desired.
*
* All default storage for the strategy is controlled and updated by the
* `TokenizedStrategy`. The implementation holds a storage struct that
* contains all needed global variables in a manual storage slot. This
* means strategists can feel free to implement their own custom storage
* variables as they need with no concern of collisions. All global variables
* can be viewed within the Strategy by a simple call using the
* `TokenizedStrategy` variable. IE: TokenizedStrategy.globalVariable();.
*/
abstract contract BaseStrategy {
/*//////////////////////////////////////////////////////////////
MODIFIERS
//////////////////////////////////////////////////////////////*/
/**
* @dev Used on TokenizedStrategy callback functions to make sure it is post
* a delegateCall from this address to the TokenizedStrategy.
*/
modifier onlySelf() {
_onlySelf();
_;
}
/**
* @dev Use to assure that the call is coming from the strategies management.
*/
modifier onlyManagement() {
TokenizedStrategy.requireManagement(msg.sender);
_;
}
/**
* @dev Use to assure that the call is coming from either the strategies
* management or the keeper.
*/
modifier onlyKeepers() {
TokenizedStrategy.requireKeeperOrManagement(msg.sender);
_;
}
/**
* @dev Use to assure that the call is coming from either the strategies
* management or the emergency admin.
*/
modifier onlyEmergencyAuthorized() {
TokenizedStrategy.requireEmergencyAuthorized(msg.sender);
_;
}
/**
* @dev Require that the msg.sender is this address.
*/
function _onlySelf() internal view {
require(msg.sender == address(this), "!self");
}
/*//////////////////////////////////////////////////////////////
CONSTANTS
//////////////////////////////////////////////////////////////*/
/**
* @dev This is the address of the TokenizedStrategy implementation
* contract that will be used by all strategies to handle the
* accounting, logic, storage etc.
*
* Any external calls to the that don't hit one of the functions
* defined in this base or the strategy will end up being forwarded
* through the fallback function, which will delegateCall this address.
*
* This address should be the same for every strategy, never be adjusted
* and always be checked before any integration with the Strategy.
*/
address public constant tokenizedStrategyAddress =
0xBB51273D6c746910C7C06fe718f30c936170feD0;
/*//////////////////////////////////////////////////////////////
IMMUTABLES
//////////////////////////////////////////////////////////////*/
/**
* @dev Underlying asset the Strategy is earning yield on.
* Stored here for cheap retrievals within the strategy.
*/
ERC20 internal immutable asset;
/**
* @dev This variable is set to address(this) during initialization of each strategy.
*
* This can be used to retrieve storage data within the strategy
* contract as if it were a linked library.
*
* i.e. uint256 totalAssets = TokenizedStrategy.totalAssets()
*
* Using address(this) will mean any calls using this variable will lead
* to a call to itself. Which will hit the fallback function and
* delegateCall that to the actual TokenizedStrategy.
*/
ITokenizedStrategy internal immutable TokenizedStrategy;
/**
* @notice Used to initialize the strategy on deployment.
*
* This will set the `TokenizedStrategy` variable for easy
* internal view calls to the implementation. As well as
* initializing the default storage variables based on the
* parameters and using the deployer for the permissioned roles.
*
* @param _asset Address of the underlying asset.
* @param _name Name the strategy will use.
*/
constructor(address _asset, string memory _name) {
asset = ERC20(_asset);
// Set instance of the implementation for internal use.
TokenizedStrategy = ITokenizedStrategy(address(this));
// Initialize the strategy's storage variables.
_delegateCall(
abi.encodeCall(
ITokenizedStrategy.initialize,
(_asset, _name, msg.sender, msg.sender, msg.sender)
)
);
// Store the tokenizedStrategyAddress at the standard implementation
// address storage slot so etherscan picks up the interface. This gets
// stored on initialization and never updated.
assembly {
sstore(
// keccak256('eip1967.proxy.implementation' - 1)
0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc,
tokenizedStrategyAddress
)
}
}
/*//////////////////////////////////////////////////////////////
NEEDED TO BE OVERRIDDEN BY STRATEGIST
//////////////////////////////////////////////////////////////*/
/**
* @dev Can deploy up to '_amount' of 'asset' in the yield source.
*
* This function is called at the end of a {deposit} or {mint}
* call. Meaning that unless a whitelist is implemented it will
* be entirely permissionless and thus can be sandwiched or otherwise
* manipulated.
*
* @param _amount The amount of 'asset' that the strategy can attempt
* to deposit in the yield source.
*/
function _deployFunds(uint256 _amount) internal virtual;
/**
* @dev Should attempt to free the '_amount' of 'asset'.
*
* NOTE: The amount of 'asset' that is already loose has already
* been accounted for.
*
* This function is called during {withdraw} and {redeem} calls.
* Meaning that unless a whitelist is implemented it will be
* entirely permissionless and thus can be sandwiched or otherwise
* manipulated.
*
* Should not rely on asset.balanceOf(address(this)) calls other than
* for diff accounting purposes.
*
* Any difference between `_amount` and what is actually freed will be
* counted as a loss and passed on to the withdrawer. This means
* care should be taken in times of illiquidity. It may be better to revert
* if withdraws are simply illiquid so not to realize incorrect losses.
*
* @param _amount, The amount of 'asset' to be freed.
*/
function _freeFunds(uint256 _amount) internal virtual;
/**
* @dev Internal function to harvest all rewards, redeploy any idle
* funds and return an accurate accounting of all funds currently
* held by the Strategy.
*
* This should do any needed harvesting, rewards selling, accrual,
* redepositing etc. to get the most accurate view of current assets.
*
* NOTE: All applicable assets including loose assets should be
* accounted for in this function.
*
* Care should be taken when relying on oracles or swap values rather
* than actual amounts as all Strategy profit/loss accounting will
* be done based on this returned value.
*
* This can still be called post a shutdown, a strategist can check
* `TokenizedStrategy.isShutdown()` to decide if funds should be
* redeployed or simply realize any profits/losses.
*
* @return _totalAssets A trusted and accurate account for the total
* amount of 'asset' the strategy currently holds including idle funds.
*/
function _harvestAndReport()
internal
virtual
returns (uint256 _totalAssets);
/*//////////////////////////////////////////////////////////////
OPTIONAL TO OVERRIDE BY STRATEGIST
//////////////////////////////////////////////////////////////*/
/**
* @dev Optional function for strategist to override that can
* be called in between reports.
*
* If '_tend' is used tendTrigger() will also need to be overridden.
*
* This call can only be called by a permissioned role so may be
* through protected relays.
*
* This can be used to harvest and compound rewards, deposit idle funds,
* perform needed position maintenance or anything else that doesn't need
* a full report for.
*
* EX: A strategy that can not deposit funds without getting
* sandwiched can use the tend when a certain threshold
* of idle to totalAssets has been reached.
*
* This will have no effect on PPS of the strategy till report() is called.
*
* @param _totalIdle The current amount of idle funds that are available to deploy.
*/
function _tend(uint256 _totalIdle) internal virtual {}
/**
* @dev Optional trigger to override if tend() will be used by the strategy.
* This must be implemented if the strategy hopes to invoke _tend().
*
* @return . Should return true if tend() should be called by keeper or false if not.
*/
function _tendTrigger() internal view virtual returns (bool) {
return false;
}
/**
* @notice Returns if tend() should be called by a keeper.
*
* @return . Should return true if tend() should be called by keeper or false if not.
* @return . Calldata for the tend call.
*/
function tendTrigger() external view virtual returns (bool, bytes memory) {
return (
// Return the status of the tend trigger.
_tendTrigger(),
// And the needed calldata either way.
abi.encodeWithSelector(ITokenizedStrategy.tend.selector)
);
}
/**
* @notice Gets the max amount of `asset` that an address can deposit.
* @dev Defaults to an unlimited amount for any address. But can
* be overridden by strategists.
*
* This function will be called before any deposit or mints to enforce
* any limits desired by the strategist. This can be used for either a
* traditional deposit limit or for implementing a whitelist etc.
*
* EX:
* if(isAllowed[_owner]) return super.availableDepositLimit(_owner);
*
* This does not need to take into account any conversion rates
* from shares to assets. But should know that any non max uint256
* amounts may be converted to shares. So it is recommended to keep
* custom amounts low enough as not to cause overflow when multiplied
* by `totalSupply`.
*
* @param . The address that is depositing into the strategy.
* @return . The available amount the `_owner` can deposit in terms of `asset`
*/
function availableDepositLimit(
address /*_owner*/
) public view virtual returns (uint256) {
return type(uint256).max;
}
/**
* @notice Gets the max amount of `asset` that can be withdrawn.
* @dev Defaults to an unlimited amount for any address. But can
* be overridden by strategists.
*
* This function will be called before any withdraw or redeem to enforce
* any limits desired by the strategist. This can be used for illiquid
* or sandwichable strategies. It should never be lower than `totalIdle`.
*
* EX:
* return TokenIzedStrategy.totalIdle();
*
* This does not need to take into account the `_owner`'s share balance
* or conversion rates from shares to assets.
*
* @param . The address that is withdrawing from the strategy.
* @return . The available amount that can be withdrawn in terms of `asset`
*/
function availableWithdrawLimit(
address /*_owner*/
) public view virtual returns (uint256) {
return type(uint256).max;
}
/**
* @dev Optional function for a strategist to override that will
* allow management to manually withdraw deployed funds from the
* yield source if a strategy is shutdown.
*
* This should attempt to free `_amount`, noting that `_amount` may
* be more than is currently deployed.
*
* NOTE: This will not realize any profits or losses. A separate
* {report} will be needed in order to record any profit/loss. If
* a report may need to be called after a shutdown it is important
* to check if the strategy is shutdown during {_harvestAndReport}
* so that it does not simply re-deploy all funds that had been freed.
*
* EX:
* if(freeAsset > 0 && !TokenizedStrategy.isShutdown()) {
* depositFunds...
* }
*
* @param _amount The amount of asset to attempt to free.
*/
function _emergencyWithdraw(uint256 _amount) internal virtual {}
/*//////////////////////////////////////////////////////////////
TokenizedStrategy HOOKS
//////////////////////////////////////////////////////////////*/
/**
* @notice Can deploy up to '_amount' of 'asset' in yield source.
* @dev Callback for the TokenizedStrategy to call during a {deposit}
* or {mint} to tell the strategy it can deploy funds.
*
* Since this can only be called after a {deposit} or {mint}
* delegateCall to the TokenizedStrategy msg.sender == address(this).
*
* Unless a whitelist is implemented this will be entirely permissionless
* and thus can be sandwiched or otherwise manipulated.
*
* @param _amount The amount of 'asset' that the strategy can
* attempt to deposit in the yield source.
*/
function deployFunds(uint256 _amount) external virtual onlySelf {
_deployFunds(_amount);
}
/**
* @notice Should attempt to free the '_amount' of 'asset'.
* @dev Callback for the TokenizedStrategy to call during a withdraw
* or redeem to free the needed funds to service the withdraw.
*
* This can only be called after a 'withdraw' or 'redeem' delegateCall
* to the TokenizedStrategy so msg.sender == address(this).
*
* @param _amount The amount of 'asset' that the strategy should attempt to free up.
*/
function freeFunds(uint256 _amount) external virtual onlySelf {
_freeFunds(_amount);
}
/**
* @notice Returns the accurate amount of all funds currently
* held by the Strategy.
* @dev Callback for the TokenizedStrategy to call during a report to
* get an accurate accounting of assets the strategy controls.
*
* This can only be called after a report() delegateCall to the
* TokenizedStrategy so msg.sender == address(this).
*
* @return . A trusted and accurate account for the total amount
* of 'asset' the strategy currently holds including idle funds.
*/
function harvestAndReport() external virtual onlySelf returns (uint256) {
return _harvestAndReport();
}
/**
* @notice Will call the internal '_tend' when a keeper tends the strategy.
* @dev Callback for the TokenizedStrategy to initiate a _tend call in the strategy.
*
* This can only be called after a tend() delegateCall to the TokenizedStrategy
* so msg.sender == address(this).
*
* We name the function `tendThis` so that `tend` calls are forwarded to
* the TokenizedStrategy.
* @param _totalIdle The amount of current idle funds that can be
* deployed during the tend
*/
function tendThis(uint256 _totalIdle) external virtual onlySelf {
_tend(_totalIdle);
}
/**
* @notice Will call the internal '_emergencyWithdraw' function.
* @dev Callback for the TokenizedStrategy during an emergency withdraw.
*
* This can only be called after a emergencyWithdraw() delegateCall to
* the TokenizedStrategy so msg.sender == address(this).
*
* We name the function `shutdownWithdraw` so that `emergencyWithdraw`
* calls are forwarded to the TokenizedStrategy.
*
* @param _amount The amount of asset to attempt to free.
*/
function shutdownWithdraw(uint256 _amount) external virtual onlySelf {
_emergencyWithdraw(_amount);
}
/**
* @dev Function used to delegate call the TokenizedStrategy with
* certain `_calldata` and return any return values.
*
* This is used to setup the initial storage of the strategy, and
* can be used by strategist to forward any other call to the
* TokenizedStrategy implementation.
*
* @param _calldata The abi encoded calldata to use in delegatecall.
* @return . The return value if the call was successful in bytes.
*/
function _delegateCall(
bytes memory _calldata
) internal returns (bytes memory) {
// Delegate call the tokenized strategy with provided calldata.
(bool success, bytes memory result) = tokenizedStrategyAddress
.delegatecall(_calldata);
// If the call reverted. Return the error.
if (!success) {
assembly {
let ptr := mload(0x40)
let size := returndatasize()
returndatacopy(ptr, 0, size)
revert(ptr, size)
}
}
// Return the result.
return result;
}
/**
* @dev Execute a function on the TokenizedStrategy and return any value.
*
* This fallback function will be executed when any of the standard functions
* defined in the TokenizedStrategy are called since they wont be defined in
* this contract.
*
* It will delegatecall the TokenizedStrategy implementation with the exact
* calldata and return any relevant values.
*
*/
fallback() external {
// load our target address
address _tokenizedStrategyAddress = tokenizedStrategyAddress;
// Execute external function using delegatecall and return any value.
assembly {
// Copy function selector and any arguments.
calldatacopy(0, 0, calldatasize())
// Execute function delegatecall.
let result := delegatecall(
gas(),
_tokenizedStrategyAddress,
0,
calldatasize(),
0,
0
)
// Get any return value
returndatacopy(0, 0, returndatasize())
// Return any return value or error back to the caller
switch result
case 0 {
revert(0, returndatasize())
}
default {
return(0, returndatasize())
}
}
}
}
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
enum Rounding {
Down, // Toward negative infinity
Up, // Toward infinity
Zero // Toward zero
}
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a > b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow.
return (a & b) + (a ^ b) / 2;
}
/**
* @dev Returns the ceiling of the division of two numbers.
*
* This differs from standard division with `/` in that it rounds up instead
* of rounding down.
*/
function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b - 1) / b can overflow on addition, so we distribute.
return a == 0 ? 0 : (a - 1) / b + 1;
}
/**
* @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
* @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
* with further edits by Uniswap Labs also under MIT license.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
unchecked {
// 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
// use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
// variables such that product = prod1 * 2^256 + prod0.
uint256 prod0; // Least significant 256 bits of the product
uint256 prod1; // Most significant 256 bits of the product
assembly {
let mm := mulmod(x, y, not(0))
prod0 := mul(x, y)
prod1 := sub(sub(mm, prod0), lt(mm, prod0))
}
// Handle non-overflow cases, 256 by 256 division.
if (prod1 == 0) {
// Solidity will revert if denominator == 0, unlike the div opcode on its own.
// The surrounding unchecked block does not change this fact.
// See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
return prod0 / denominator;
}
// Make sure the result is less than 2^256. Also prevents denominator == 0.
require(denominator > prod1, "Math: mulDiv overflow");
///////////////////////////////////////////////
// 512 by 256 division.
///////////////////////////////////////////////
// Make division exact by subtracting the remainder from [prod1 prod0].
uint256 remainder;
assembly {
// Compute remainder using mulmod.
remainder := mulmod(x, y, denominator)
// Subtract 256 bit number from 512 bit number.
prod1 := sub(prod1, gt(remainder, prod0))
prod0 := sub(prod0, remainder)
}
// Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
// See https://cs.stackexchange.com/q/138556/92363.
// Does not overflow because the denominator cannot be zero at this stage in the function.
uint256 twos = denominator & (~denominator + 1);
assembly {
// Divide denominator by twos.
denominator := div(denominator, twos)
// Divide [prod1 prod0] by twos.
prod0 := div(prod0, twos)
// Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
twos := add(div(sub(0, twos), twos), 1)
}
// Shift in bits from prod1 into prod0.
prod0 |= prod1 * twos;
// Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
// that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
// four bits. That is, denominator * inv = 1 mod 2^4.
uint256 inverse = (3 * denominator) ^ 2;
// Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
// in modular arithmetic, doubling the correct bits in each step.
inverse *= 2 - denominator * inverse; // inverse mod 2^8
inverse *= 2 - denominator * inverse; // inverse mod 2^16
inverse *= 2 - denominator * inverse; // inverse mod 2^32
inverse *= 2 - denominator * inverse; // inverse mod 2^64
inverse *= 2 - denominator * inverse; // inverse mod 2^128
inverse *= 2 - denominator * inverse; // inverse mod 2^256
// Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
// This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
// less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
// is no longer required.
result = prod0 * inverse;
return result;
}
}
/**
* @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
*/
function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
uint256 result = mulDiv(x, y, denominator);
if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
result += 1;
}
return result;
}
/**
* @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
*
* Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
*/
function sqrt(uint256 a) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
// For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
//
// We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
// `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
//
// This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
// → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
// → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
//
// Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
uint256 result = 1 << (log2(a) >> 1);
// At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
// since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
// every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
// into the expected uint128 result.
unchecked {
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
result = (result + a / result) >> 1;
return min(result, a / result);
}
}
/**
* @notice Calculates sqrt(a), following the selected rounding direction.
*/
function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = sqrt(a);
return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
}
}
/**
* @dev Return the log in base 2, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 128;
}
if (value >> 64 > 0) {
value >>= 64;
result += 64;
}
if (value >> 32 > 0) {
value >>= 32;
result += 32;
}
if (value >> 16 > 0) {
value >>= 16;
result += 16;
}
if (value >> 8 > 0) {
value >>= 8;
result += 8;
}
if (value >> 4 > 0) {
value >>= 4;
result += 4;
}
if (value >> 2 > 0) {
value >>= 2;
result += 2;
}
if (value >> 1 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 2, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log2(value);
return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 10, rounded down, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >= 10 ** 64) {
value /= 10 ** 64;
result += 64;
}
if (value >= 10 ** 32) {
value /= 10 ** 32;
result += 32;
}
if (value >= 10 ** 16) {
value /= 10 ** 16;
result += 16;
}
if (value >= 10 ** 8) {
value /= 10 ** 8;
result += 8;
}
if (value >= 10 ** 4) {
value /= 10 ** 4;
result += 4;
}
if (value >= 10 ** 2) {
value /= 10 ** 2;
result += 2;
}
if (value >= 10 ** 1) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 10, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log10(value);
return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
}
}
/**
* @dev Return the log in base 256, rounded down, of a positive value.
* Returns 0 if given 0.
*
* Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
*/
function log256(uint256 value) internal pure returns (uint256) {
uint256 result = 0;
unchecked {
if (value >> 128 > 0) {
value >>= 128;
result += 16;
}
if (value >> 64 > 0) {
value >>= 64;
result += 8;
}
if (value >> 32 > 0) {
value >>= 32;
result += 4;
}
if (value >> 16 > 0) {
value >>= 16;
result += 2;
}
if (value >> 8 > 0) {
result += 1;
}
}
return result;
}
/**
* @dev Return the log in base 256, following the selected rounding direction, of a positive value.
* Returns 0 if given 0.
*/
function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
unchecked {
uint256 result = log256(value);
return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
}
}
}
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)
/**
* @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
*
* Furthermore, `isContract` will also return true if the target contract within
* the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
* which only has an effect at the end of a transaction.
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, "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");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResultFromTarget(target, 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) {
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResultFromTarget(target, success, returndata, errorMessage);
}
/**
* @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
* the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
*
* _Available since v4.8._
*/
function verifyCallResultFromTarget(
address target,
bool success,
bytes memory returndata,
string memory errorMessage
) internal view returns (bytes memory) {
if (success) {
if (returndata.length == 0) {
// only check isContract if the call was successful and the return data is empty
// otherwise we already know that it was a contract
require(isContract(target), "Address: call to non-contract");
}
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason or using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
_revert(returndata, errorMessage);
}
}
function _revert(bytes memory returndata, string memory errorMessage) private pure {
// 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
/**
* @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;
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
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");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);
if (!_callOptionalReturnBool(token, approvalCall)) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
_callOptionalReturn(token, approvalCall);
}
}
/**
* @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
* Revert on invalid signature.
*/
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @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");
require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
/**
* @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).
*
* This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
*/
function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
// 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 cannot use {Address-functionCall} here since this should return false
// and not revert is the subcall reverts.
(bool success, bytes memory returndata) = address(token).call(data);
return
success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
}
}
/**
* @title IScaledBalanceToken
* @author Aave
* @notice Defines the basic interface for a scaledbalance token.
**/
interface IScaledBalanceToken {
/**
* @dev Emitted after the mint action
* @param caller The address performing the mint
* @param onBehalfOf The address of the user that will receive the minted scaled balance tokens
* @param value The amount being minted (user entered amount + balance increase from interest)
* @param balanceIncrease The increase in balance since the last action of the user
* @param index The next liquidity index of the reserve
**/
event Mint(
address indexed caller,
address indexed onBehalfOf,
uint256 value,
uint256 balanceIncrease,
uint256 index
);
/**
* @dev Emitted after scaled balance tokens are burned
* @param from The address from which the scaled tokens will be burned
* @param target The address that will receive the underlying, if any
* @param value The amount being burned (user entered amount - balance increase from interest)
* @param balanceIncrease The increase in balance since the last action of the user
* @param index The next liquidity index of the reserve
**/
event Burn(
address indexed from,
address indexed target,
uint256 value,
uint256 balanceIncrease,
uint256 index
);
/**
* @notice Returns the scaled balance of the user.
* @dev The scaled balance is the sum of all the updated stored balance divided by the reserve's liquidity index
* at the moment of the update
* @param user The user whose balance is calculated
* @return The scaled balance of the user
**/
function scaledBalanceOf(address user) external view returns (uint256);
/**
* @notice Returns the scaled balance of the user and the scaled total supply.
* @param user The address of the user
* @return The scaled balance of the user
* @return The scaled total supply
**/
function getScaledUserBalanceAndSupply(
address user
) external view returns (uint256, uint256);
/**
* @notice Returns the scaled total supply of the scaled balance token. Represents sum(debt/index)
* @return The scaled total supply
**/
function scaledTotalSupply() external view returns (uint256);
/**
* @notice Returns last index interest was accrued to the user's balance
* @param user The address of the user
* @return The last index interest was accrued to the user's balance, expressed in ray
**/
function getPreviousIndex(address user) external view returns (uint256);
}
/**
* @title IRewardsDistributor
* @author Aave
* @notice Defines the basic interface for a Rewards Distributor.
*/
interface IRewardsDistributor {
/**
* @dev Emitted when the configuration of the rewards of an asset is updated.
* @param asset The address of the incentivized asset
* @param reward The address of the reward token
* @param oldEmission The old emissions per second value of the reward distribution
* @param newEmission The new emissions per second value of the reward distribution
* @param oldDistributionEnd The old end timestamp of the reward distribution
* @param newDistributionEnd The new end timestamp of the reward distribution
* @param assetIndex The index of the asset distribution
*/
event AssetConfigUpdated(
address indexed asset,
address indexed reward,
uint256 oldEmission,
uint256 newEmission,
uint256 oldDistributionEnd,
uint256 newDistributionEnd,
uint256 assetIndex
);
/**
* @dev Emitted when rewards of an asset are accrued on behalf of a user.
* @param asset The address of the incentivized asset
* @param reward The address of the reward token
* @param user The address of the user that rewards are accrued on behalf of
* @param assetIndex The index of the asset distribution
* @param userIndex The index of the asset distribution on behalf of the user
* @param rewardsAccrued The amount of rewards accrued
*/
event Accrued(
address indexed asset,
address indexed reward,
address indexed user,
uint256 assetIndex,
uint256 userIndex,
uint256 rewardsAccrued
);
/**
* @dev Emitted when the emission manager address is updated.
* @param oldEmissionManager The address of the old emission manager
* @param newEmissionManager The address of the new emission manager
*/
event EmissionManagerUpdated(
address indexed oldEmissionManager,
address indexed newEmissionManager
);
/**
* @dev Sets the end date for the distribution
* @param asset The asset to incentivize
* @param reward The reward token that incentives the asset
* @param newDistributionEnd The end date of the incentivization, in unix time format
**/
function setDistributionEnd(
address asset,
address reward,
uint32 newDistributionEnd
) external;
/**
* @dev Sets the emission per second of a set of reward distributions
* @param asset The asset is being incentivized
* @param rewards List of reward addresses are being distributed
* @param newEmissionsPerSecond List of new reward emissions per second
*/
function setEmissionPerSecond(
address asset,
address[] calldata rewards,
uint88[] calldata newEmissionsPerSecond
) external;
/**
* @dev Gets the end date for the distribution
* @param asset The incentivized asset
* @param reward The reward token of the incentivized asset
* @return The timestamp with the end of the distribution, in unix time format
**/
function getDistributionEnd(
address asset,
address reward
) external view returns (uint256);
/**
* @dev Returns the index of a user on a reward distribution
* @param user Address of the user
* @param asset The incentivized asset
* @param reward The reward token of the incentivized asset
* @return The current user asset index, not including new distributions
**/
function getUserAssetIndex(
address user,
address asset,
address reward
) external view returns (uint256);
/**
* @dev Returns the configuration of the distribution reward for a certain asset
* @param asset The incentivized asset
* @param reward The reward token of the incentivized asset
* @return The index of the asset distribution
* @return The emission per second of the reward distribution
* @return The timestamp of the last update of the index
* @return The timestamp of the distribution end
**/
function getRewardsData(
address asset,
address reward
) external view returns (uint256, uint256, uint256, uint256);
/**
* @dev Returns the list of available reward token addresses of an incentivized asset
* @param asset The incentivized asset
* @return List of rewards addresses of the input asset
**/
function getRewardsByAsset(
address asset
) external view returns (address[] memory);
/**
* @dev Returns the list of available reward addresses
* @return List of rewards supported in this contract
**/
function getRewardsList() external view returns (address[] memory);
/**
* @dev Returns the accrued rewards balance of a user, not including virtually accrued rewards since last distribution.
* @param user The address of the user
* @param reward The address of the reward token
* @return Unclaimed rewards, not including new distributions
**/
function getUserAccruedRewards(
address user,
address reward
) external view returns (uint256);
/**
* @dev Returns a single rewards balance of a user, including virtually accrued and unrealized claimable rewards.
* @param assets List of incentivized assets to check eligible distributions
* @param user The address of the user
* @param reward The address of the reward token
* @return The rewards amount
**/
function getUserRewards(
address[] calldata assets,
address user,
address reward
) external view returns (uint256);
/**
* @dev Returns a list all rewards of a user, including already accrued and unrealized claimable rewards
* @param assets List of incentivized assets to check eligible distributions
* @param user The address of the user
* @return The list of reward addresses
* @return The list of unclaimed amount of rewards
**/
function getAllUserRewards(
address[] calldata assets,
address user
) external view returns (address[] memory, uint256[] memory);
/**
* @dev Returns the decimals of an asset to calculate the distribution delta
* @param asset The address to retrieve decimals
* @return The decimals of an underlying asset
*/
function getAssetDecimals(address asset) external view returns (uint8);
/**
* @dev Returns the address of the emission manager
* @return The address of the EmissionManager
*/
function getEmissionManager() external view returns (address);
/**
* @dev Updates the address of the emission manager
* @param emissionManager The address of the new EmissionManager
*/
function setEmissionManager(address emissionManager) external;
}
/**
* @title IRewardsController
* @author Aave
* @notice Defines the basic interface for a Rewards Controller.
*/
interface IRewardsController is IRewardsDistributor {
/**
* @dev Emitted when a new address is whitelisted as claimer of rewards on behalf of a user
* @param user The address of the user
* @param claimer The address of the claimer
*/
event ClaimerSet(address indexed user, address indexed claimer);
/**
* @dev Emitted when rewards are claimed
* @param user The address of the user rewards has been claimed on behalf of
* @param reward The address of the token reward is claimed
* @param to The address of the receiver of the rewards
* @param claimer The address of the claimer
* @param amount The amount of rewards claimed
*/
event RewardsClaimed(
address indexed user,
address indexed reward,
address indexed to,
address claimer,
uint256 amount
);
/**
* @dev Emitted when a transfer strategy is installed for the reward distribution
* @param reward The address of the token reward
* @param transferStrategy The address of TransferStrategy contract
*/
event TransferStrategyInstalled(
address indexed reward,
address indexed transferStrategy
);
/**
* @dev Emitted when the reward oracle is updated
* @param reward The address of the token reward
* @param rewardOracle The address of oracle
*/
event RewardOracleUpdated(
address indexed reward,
address indexed rewardOracle
);
/**
* @dev Whitelists an address to claim the rewards on behalf of another address
* @param user The address of the user
* @param claimer The address of the claimer
*/
function setClaimer(address user, address claimer) external;
/**
* @dev Get the price aggregator oracle address
* @param reward The address of the reward
* @return The price oracle of the reward
*/
function getRewardOracle(address reward) external view returns (address);
/**
* @dev Returns the whitelisted claimer for a certain address (0x0 if not set)
* @param user The address of the user
* @return The claimer address
*/
function getClaimer(address user) external view returns (address);
/**
* @dev Returns the Transfer Strategy implementation contract address being used for a reward address
* @param reward The address of the reward
* @return The address of the TransferStrategy contract
*/
function getTransferStrategy(
address reward
) external view returns (address);
/**
* @dev Called by the corresponding asset on any update that affects the rewards distribution
* @param user The address of the user
* @param userBalance The user balance of the asset
* @param totalSupply The total supply of the asset
**/
function handleAction(
address user,
uint256 userBalance,
uint256 totalSupply
) external;
/**
* @dev Claims reward for a user to the desired address, on all the assets of the pool, accumulating the pending rewards
* @param assets List of assets to check eligible distributions before claiming rewards
* @param amount The amount of rewards to claim
* @param to The address that will be receiving the rewards
* @param reward The address of the reward token
* @return The amount of rewards claimed
**/
function claimRewards(
address[] calldata assets,
uint256 amount,
address to,
address reward
) external returns (uint256);
/**
* @dev Claims reward for a user on behalf, on all the assets of the pool, accumulating the pending rewards. The
* caller must be whitelisted via "allowClaimOnBehalf" function by the RewardsAdmin role manager
* @param assets The list of assets to check eligible distributions before claiming rewards
* @param amount The amount of rewards to claim
* @param user The address to check and claim rewards
* @param to The address that will be receiving the rewards
* @param reward The address of the reward token
* @return The amount of rewards claimed
**/
function claimRewardsOnBehalf(
address[] calldata assets,
uint256 amount,
address user,
address to,
address reward
) external returns (uint256);
/**
* @dev Claims reward for msg.sender, on all the assets of the pool, accumulating the pending rewards
* @param assets The list of assets to check eligible distributions before claiming rewards
* @param amount The amount of rewards to claim
* @param reward The address of the reward token
* @return The amount of rewards claimed
**/
function claimRewardsToSelf(
address[] calldata assets,
uint256 amount,
address reward
) external returns (uint256);
/**
* @dev Claims all rewards for a user to the desired address, on all the assets of the pool, accumulating the pending rewards
* @param assets The list of assets to check eligible distributions before claiming rewards
* @param to The address that will be receiving the rewards
* @return rewardsList List of addresses of the reward tokens
* @return claimedAmounts List that contains the claimed amount per reward, following same order as "rewardList"
**/
function claimAllRewards(
address[] calldata assets,
address to
)
external
returns (address[] memory rewardsList, uint256[] memory claimedAmounts);
/**
* @dev Claims all rewards for a user on behalf, on all the assets of the pool, accumulating the pending rewards. The caller must
* be whitelisted via "allowClaimOnBehalf" function by the RewardsAdmin role manager
* @param assets The list of assets to check eligible distributions before claiming rewards
* @param user The address to check and claim rewards
* @param to The address that will be receiving the rewards
* @return rewardsList List of addresses of the reward tokens
* @return claimedAmounts List that contains the claimed amount per reward, following same order as "rewardsList"
**/
function claimAllRewardsOnBehalf(
address[] calldata assets,
address user,
address to
)
external
returns (address[] memory rewardsList, uint256[] memory claimedAmounts);
/**
* @dev Claims all reward for msg.sender, on all the assets of the pool, accumulating the pending rewards
* @param assets The list of assets to check eligible distributions before claiming rewards
* @return rewardsList List of addresses of the reward tokens
* @return claimedAmounts List that contains the claimed amount per reward, following same order as "rewardsList"
**/
function claimAllRewardsToSelf(
address[] calldata assets
)
external
returns (address[] memory rewardsList, uint256[] memory claimedAmounts);
}
/**
* @title IPoolAddressesProvider
* @author Aave
* @notice Defines the basic interface for a Pool Addresses Provider.
**/
interface IPoolAddressesProvider {
/**
* @dev Emitted when the market identifier is updated.
* @param oldMarketId The old id of the market
* @param newMarketId The new id of the market
*/
event MarketIdSet(string indexed oldMarketId, string indexed newMarketId);
/**
* @dev Emitted when the pool is updated.
* @param oldAddress The old address of the Pool
* @param newAddress The new address of the Pool
*/
event PoolUpdated(address indexed oldAddress, address indexed newAddress);
/**
* @dev Emitted when the pool configurator is updated.
* @param oldAddress The old address of the PoolConfigurator
* @param newAddress The new address of the PoolConfigurator
*/
event PoolConfiguratorUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the price oracle is updated.
* @param oldAddress The old address of the PriceOracle
* @param newAddress The new address of the PriceOracle
*/
event PriceOracleUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the ACL manager is updated.
* @param oldAddress The old address of the ACLManager
* @param newAddress The new address of the ACLManager
*/
event ACLManagerUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the ACL admin is updated.
* @param oldAddress The old address of the ACLAdmin
* @param newAddress The new address of the ACLAdmin
*/
event ACLAdminUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the price oracle sentinel is updated.
* @param oldAddress The old address of the PriceOracleSentinel
* @param newAddress The new address of the PriceOracleSentinel
*/
event PriceOracleSentinelUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the pool data provider is updated.
* @param oldAddress The old address of the PoolDataProvider
* @param newAddress The new address of the PoolDataProvider
*/
event PoolDataProviderUpdated(
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when a new proxy is created.
* @param id The identifier of the proxy
* @param proxyAddress The address of the created proxy contract
* @param implementationAddress The address of the implementation contract
*/
event ProxyCreated(
bytes32 indexed id,
address indexed proxyAddress,
address indexed implementationAddress
);
/**
* @dev Emitted when a new non-proxied contract address is registered.
* @param id The identifier of the contract
* @param oldAddress The address of the old contract
* @param newAddress The address of the new contract
*/
event AddressSet(
bytes32 indexed id,
address indexed oldAddress,
address indexed newAddress
);
/**
* @dev Emitted when the implementation of the proxy registered with id is updated
* @param id The identifier of the contract
* @param proxyAddress The address of the proxy contract
* @param oldImplementationAddress The address of the old implementation contract
* @param newImplementationAddress The address of the new implementation contract
*/
event AddressSetAsProxy(
bytes32 indexed id,
address indexed proxyAddress,
address oldImplementationAddress,
address indexed newImplementationAddress
);
/**
* @notice Returns the id of the Aave market to which this contract points to.
* @return The market id
**/
function getMarketId() external view returns (string memory);
/**
* @notice Associates an id with a specific PoolAddressesProvider.
* @dev This can be used to create an onchain registry of PoolAddressesProviders to
* identify and validate multiple Aave markets.
* @param newMarketId The market id
*/
function setMarketId(string calldata newMarketId) external;
/**
* @notice Returns an address by its identifier.
* @dev The returned address might be an EOA or a contract, potentially proxied
* @dev It returns ZERO if there is no registered address with the given id
* @param id The id
* @return The address of the registered for the specified id
*/
function getAddress(bytes32 id) external view returns (address);
/**
* @notice General function to update the implementation of a proxy registered with
* certain `id`. If there is no proxy registered, it will instantiate one and
* set as implementation the `newImplementationAddress`.
* @dev IMPORTANT Use this function carefully, only for ids that don't have an explicit
* setter function, in order to avoid unexpected consequences
* @param id The id
* @param newImplementationAddress The address of the new implementation
*/
function setAddressAsProxy(
bytes32 id,
address newImplementationAddress
) external;
/**
* @notice Sets an address for an id replacing the address saved in the addresses map.
* @dev IMPORTANT Use this function carefully, as it will do a hard replacement
* @param id The id
* @param newAddress The address to set
*/
function setAddress(bytes32 id, address newAddress) external;
/**
* @notice Returns the address of the Pool proxy.
* @return The Pool proxy address
**/
function getPool() external view returns (address);
/**
* @notice Updates the implementation of the Pool, or creates a proxy
* setting the new `pool` implementation when the function is called for the first time.
* @param newPoolImpl The new Pool implementation
**/
function setPoolImpl(address newPoolImpl) external;
/**
* @notice Returns the address of the PoolConfigurator proxy.
* @return The PoolConfigurator proxy address
**/
function getPoolConfigurator() external view returns (address);
/**
* @notice Updates the implementation of the PoolConfigurator, or creates a proxy
* setting the new `PoolConfigurator` implementation when the function is called for the first time.
* @param newPoolConfiguratorImpl The new PoolConfigurator implementation
**/
function setPoolConfiguratorImpl(address newPoolConfiguratorImpl) external;
/**
* @notice Returns the address of the price oracle.
* @return The address of the PriceOracle
*/
function getPriceOracle() external view returns (address);
/**
* @notice Updates the address of the price oracle.
* @param newPriceOracle The address of the new PriceOracle
*/
function setPriceOracle(address newPriceOracle) external;
/**
* @notice Returns the address of the ACL manager.
* @return The address of the ACLManager
*/
function getACLManager() external view returns (address);
/**
* @notice Updates the address of the ACL manager.
* @param newAclManager The address of the new ACLManager
**/
function setACLManager(address newAclManager) external;
/**
* @notice Returns the address of the ACL admin.
* @return The address of the ACL admin
*/
function getACLAdmin() external view returns (address);
/**
* @notice Updates the address of the ACL admin.
* @param newAclAdmin The address of the new ACL admin
*/
function setACLAdmin(address newAclAdmin) external;
/**
* @notice Returns the address of the price oracle sentinel.
* @return The address of the PriceOracleSentinel
*/
function getPriceOracleSentinel() external view returns (address);
/**
* @notice Updates the address of the price oracle sentinel.
* @param newPriceOracleSentinel The address of the new PriceOracleSentinel
**/
function setPriceOracleSentinel(address newPriceOracleSentinel) external;
/**
* @notice Returns the address of the data provider.
* @return The address of the DataProvider
*/
function getPoolDataProvider() external view returns (address);
/**
* @notice Updates the address of the data provider.
* @param newDataProvider The address of the new DataProvider
**/
function setPoolDataProvider(address newDataProvider) external;
}
library DataTypesV3 {
struct ReserveData {
//stores the reserve configuration
ReserveConfigurationMap configuration;
//the liquidity index. Expressed in ray
uint128 liquidityIndex;
//the current supply rate. Expressed in ray
uint128 currentLiquidityRate;
//variable borrow index. Expressed in ray
uint128 variableBorrowIndex;
//the current variable borrow rate. Expressed in ray
uint128 currentVariableBorrowRate;
//the current stable borrow rate. Expressed in ray
uint128 currentStableBorrowRate;
//timestamp of last update
uint40 lastUpdateTimestamp;
//the id of the reserve. Represents the position in the list of the active reserves
uint16 id;
//aToken address
address aTokenAddress;
//stableDebtToken address
address stableDebtTokenAddress;
//variableDebtToken address
address variableDebtTokenAddress;
//address of the interest rate strategy
address interestRateStrategyAddress;
//the current treasury balance, scaled
uint128 accruedToTreasury;
//the outstanding unbacked aTokens minted through the bridging feature
uint128 unbacked;
//the outstanding debt borrowed against this asset in isolation mode
uint128 isolationModeTotalDebt;
}
struct ReserveConfigurationMap {
//bit 0-15: LTV
//bit 16-31: Liq. threshold
//bit 32-47: Liq. bonus
//bit 48-55: Decimals
//bit 56: reserve is active
//bit 57: reserve is frozen
//bit 58: borrowing is enabled
//bit 59: stable rate borrowing enabled
//bit 60: asset is paused
//bit 61: borrowing in isolation mode is enabled
//bit 62-63: reserved
//bit 64-79: reserve factor
//bit 80-115 borrow cap in whole tokens, borrowCap == 0 => no cap
//bit 116-151 supply cap in whole tokens, supplyCap == 0 => no cap
//bit 152-167 liquidation protocol fee
//bit 168-175 eMode category
//bit 176-211 unbacked mint cap in whole tokens, unbackedMintCap == 0 => minting disabled
//bit 212-251 debt ceiling for isolation mode with (ReserveConfiguration::DEBT_CEILING_DECIMALS) decimals
//bit 252-255 unused
uint256 data;
}
struct UserConfigurationMap {
/**
* @dev Bitmap of the users collaterals and borrows. It is divided in pairs of bits, one pair per asset.
* The first bit indicates if an asset is used as collateral by the user, the second whether an
* asset is borrowed by the user.
*/
uint256 data;
}
struct EModeCategory {
// each eMode category has a custom ltv and liquidation threshold
uint16 ltv;
uint16 liquidationThreshold;
uint16 liquidationBonus;
// each eMode category may or may not have a custom oracle to override the individual assets price oracles
address priceSource;
string label;
}
enum InterestRateMode {
NONE,
STABLE,
VARIABLE
}
struct ReserveCache {
uint256 currScaledVariableDebt;
uint256 nextScaledVariableDebt;
uint256 currPrincipalStableDebt;
uint256 currAvgStableBorrowRate;
uint256 currTotalStableDebt;
uint256 nextAvgStableBorrowRate;
uint256 nextTotalStableDebt;
uint256 currLiquidityIndex;
uint256 nextLiquidityIndex;
uint256 currVariableBorrowIndex;
uint256 nextVariableBorrowIndex;
uint256 currLiquidityRate;
uint256 currVariableBorrowRate;
uint256 reserveFactor;
ReserveConfigurationMap reserveConfiguration;
address aTokenAddress;
address stableDebtTokenAddress;
address variableDebtTokenAddress;
uint40 reserveLastUpdateTimestamp;
uint40 stableDebtLastUpdateTimestamp;
}
struct ExecuteLiquidationCallParams {
uint256 reservesCount;
uint256 debtToCover;
address collateralAsset;
address debtAsset;
address user;
bool receiveAToken;
address priceOracle;
uint8 userEModeCategory;
address priceOracleSentinel;
}
struct ExecuteSupplyParams {
address asset;
uint256 amount;
address onBehalfOf;
uint16 referralCode;
}
struct ExecuteBorrowParams {
address asset;
address user;
address onBehalfOf;
uint256 amount;
InterestRateMode interestRateMode;
uint16 referralCode;
bool releaseUnderlying;
uint256 maxStableRateBorrowSizePercent;
uint256 reservesCount;
address oracle;
uint8 userEModeCategory;
address priceOracleSentinel;
}
struct ExecuteRepayParams {
address asset;
uint256 amount;
InterestRateMode interestRateMode;
address onBehalfOf;
bool useATokens;
}
struct ExecuteWithdrawParams {
address asset;
uint256 amount;
address to;
uint256 reservesCount;
address oracle;
uint8 userEModeCategory;
}
struct ExecuteSetUserEModeParams {
uint256 reservesCount;
address oracle;
uint8 categoryId;
}
struct FinalizeTransferParams {
address asset;
address from;
address to;
uint256 amount;
uint256 balanceFromBefore;
uint256 balanceToBefore;
uint256 reservesCount;
address oracle;
uint8 fromEModeCategory;
}
struct FlashloanParams {
address receiverAddress;
address[] assets;
uint256[] amounts;
uint256[] interestRateModes;
address onBehalfOf;
bytes params;
uint16 referralCode;
uint256 flashLoanPremiumToProtocol;
uint256 flashLoanPremiumTotal;
uint256 maxStableRateBorrowSizePercent;
uint256 reservesCount;
address addressesProvider;
uint8 userEModeCategory;
bool isAuthorizedFlashBorrower;
}
struct FlashloanSimpleParams {
address receiverAddress;
address asset;
uint256 amount;
bytes params;
uint16 referralCode;
uint256 flashLoanPremiumToProtocol;
uint256 flashLoanPremiumTotal;
}
struct FlashLoanRepaymentParams {
uint256 amount;
uint256 totalPremium;
uint256 flashLoanPremiumToProtocol;
address asset;
address receiverAddress;
uint16 referralCode;
}
struct CalculateUserAccountDataParams {
UserConfigurationMap userConfig;
uint256 reservesCount;
address user;
address oracle;
uint8 userEModeCategory;
}
struct ValidateBorrowParams {
ReserveCache reserveCache;
UserConfigurationMap userConfig;
address asset;
address userAddress;
uint256 amount;
InterestRateMode interestRateMode;
uint256 maxStableLoanPercent;
uint256 reservesCount;
address oracle;
uint8 userEModeCategory;
address priceOracleSentinel;
bool isolationModeActive;
address isolationModeCollateralAddress;
uint256 isolationModeDebtCeiling;
}
struct ValidateLiquidationCallParams {
ReserveCache debtReserveCache;
uint256 totalDebt;
uint256 healthFactor;
address priceOracleSentinel;
}
struct CalculateInterestRatesParams {
uint256 unbacked;
uint256 liquidityAdded;
uint256 liquidityTaken;
uint256 totalStableDebt;
uint256 totalVariableDebt;
uint256 averageStableBorrowRate;
uint256 reserveFactor;
address reserve;
address aToken;
}
struct InitReserveParams {
address asset;
address aTokenAddress;
address stableDebtAddress;
address variableDebtAddress;
address interestRateStrategyAddress;
uint16 reservesCount;
uint16 maxNumberReserves;
}
}
/**
* @title IPool
* @author Aave
* @notice Defines the basic interface for an Aave Pool.
**/
interface IPool {
/**
* @dev Emitted on mintUnbacked()
* @param reserve The address of the underlying asset of the reserve
* @param user The address initiating the supply
* @param onBehalfOf The beneficiary of the supplied assets, receiving the aTokens
* @param amount The amount of supplied assets
* @param referralCode The referral code used
**/
event MintUnbacked(
address indexed reserve,
address user,
address indexed onBehalfOf,
uint256 amount,
uint16 indexed referralCode
);
/**
* @dev Emitted on backUnbacked()
* @param reserve The address of the underlying asset of the reserve
* @param backer The address paying for the backing
* @param amount The amount added as backing
* @param fee The amount paid in fees
**/
event BackUnbacked(
address indexed reserve,
address indexed backer,
uint256 amount,
uint256 fee
);
/**
* @dev Emitted on supply()
* @param reserve The address of the underlying asset of the reserve
* @param user The address initiating the supply
* @param onBehalfOf The beneficiary of the supply, receiving the aTokens
* @param amount The amount supplied
* @param referralCode The referral code used
**/
event Supply(
address indexed reserve,
address user,
address indexed onBehalfOf,
uint256 amount,
uint16 indexed referralCode
);
/**
* @dev Emitted on withdraw()
* @param reserve The address of the underlying asset being withdrawn
* @param user The address initiating the withdrawal, owner of aTokens
* @param to The address that will receive the underlying
* @param amount The amount to be withdrawn
**/
event Withdraw(
address indexed reserve,
address indexed user,
address indexed to,
uint256 amount
);
/**
* @dev Emitted on borrow() and flashLoan() when debt needs to be opened
* @param reserve The address of the underlying asset being borrowed
* @param user The address of the user initiating the borrow(), receiving the funds on borrow() or just
* initiator of the transaction on flashLoan()
* @param onBehalfOf The address that will be getting the debt
* @param amount The amount borrowed out
* @param interestRateMode The rate mode: 1 for Stable, 2 for Variable
* @param borrowRate The numeric rate at which the user has borrowed, expressed in ray
* @param referralCode The referral code used
**/
event Borrow(
address indexed reserve,
address user,
address indexed onBehalfOf,
uint256 amount,
DataTypesV3.InterestRateMode interestRateMode,
uint256 borrowRate,
uint16 indexed referralCode
);
/**
* @dev Emitted on repay()
* @param reserve The address of the underlying asset of the reserve
* @param user The beneficiary of the repayment, getting his debt reduced
* @param repayer The address of the user initiating the repay(), providing the funds
* @param amount The amount repaid
* @param useATokens True if the repayment is done using aTokens, `false` if done with underlying asset directly
**/
event Repay(
address indexed reserve,
address indexed user,
address indexed repayer,
uint256 amount,
bool useATokens
);
/**
* @dev Emitted on swapBorrowRateMode()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user swapping his rate mode
* @param interestRateMode The current interest rate mode of the position being swapped: 1 for Stable, 2 for Variable
**/
event SwapBorrowRateMode(
address indexed reserve,
address indexed user,
DataTypesV3.InterestRateMode interestRateMode
);
/**
* @dev Emitted on borrow(), repay() and liquidationCall() when using isolated assets
* @param asset The address of the underlying asset of the reserve
* @param totalDebt The total isolation mode debt for the reserve
*/
event IsolationModeTotalDebtUpdated(
address indexed asset,
uint256 totalDebt
);
/**
* @dev Emitted when the user selects a certain asset category for eMode
* @param user The address of the user
* @param categoryId The category id
**/
event UserEModeSet(address indexed user, uint8 categoryId);
/**
* @dev Emitted on setUserUseReserveAsCollateral()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user enabling the usage as collateral
**/
event ReserveUsedAsCollateralEnabled(
address indexed reserve,
address indexed user
);
/**
* @dev Emitted on setUserUseReserveAsCollateral()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user enabling the usage as collateral
**/
event ReserveUsedAsCollateralDisabled(
address indexed reserve,
address indexed user
);
/**
* @dev Emitted on rebalanceStableBorrowRate()
* @param reserve The address of the underlying asset of the reserve
* @param user The address of the user for which the rebalance has been executed
**/
event RebalanceStableBorrowRate(
address indexed reserve,
address indexed user
);
/**
* @dev Emitted on flashLoan()
* @param target The address of the flash loan receiver contract
* @param initiator The address initiating the flash loan
* @param asset The address of the asset being flash borrowed
* @param amount The amount flash borrowed
* @param interestRateMode The flashloan mode: 0 for regular flashloan, 1 for Stable debt, 2 for Variable debt
* @param premium The fee flash borrowed
* @param referralCode The referral code used
**/
event FlashLoan(
address indexed target,
address initiator,
address indexed asset,
uint256 amount,
DataTypesV3.InterestRateMode interestRateMode,
uint256 premium,
uint16 indexed referralCode
);
/**
* @dev Emitted when a borrower is liquidated.
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param user The address of the borrower getting liquidated
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
* @param liquidatedCollateralAmount The amount of collateral received by the liquidator
* @param liquidator The address of the liquidator
* @param receiveAToken True if the liquidators wants to receive the collateral aTokens, `false` if he wants
* to receive the underlying collateral asset directly
**/
event LiquidationCall(
address indexed collateralAsset,
address indexed debtAsset,
address indexed user,
uint256 debtToCover,
uint256 liquidatedCollateralAmount,
address liquidator,
bool receiveAToken
);
/**
* @dev Emitted when the state of a reserve is updated.
* @param reserve The address of the underlying asset of the reserve
* @param liquidityRate The next liquidity rate
* @param stableBorrowRate The next stable borrow rate
* @param variableBorrowRate The next variable borrow rate
* @param liquidityIndex The next liquidity index
* @param variableBorrowIndex The next variable borrow index
**/
event ReserveDataUpdated(
address indexed reserve,
uint256 liquidityRate,
uint256 stableBorrowRate,
uint256 variableBorrowRate,
uint256 liquidityIndex,
uint256 variableBorrowIndex
);
/**
* @dev Emitted when the protocol treasury receives minted aTokens from the accrued interest.
* @param reserve The address of the reserve
* @param amountMinted The amount minted to the treasury
**/
event MintedToTreasury(address indexed reserve, uint256 amountMinted);
/**
* @dev Mints an `amount` of aTokens to the `onBehalfOf`
* @param asset The address of the underlying asset to mint
* @param amount The amount to mint
* @param onBehalfOf The address that will receive the aTokens
* @param referralCode Code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
**/
function mintUnbacked(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external;
/**
* @dev Back the current unbacked underlying with `amount` and pay `fee`.
* @param asset The address of the underlying asset to back
* @param amount The amount to back
* @param fee The amount paid in fees
**/
function backUnbacked(address asset, uint256 amount, uint256 fee) external;
/**
* @notice Supplies an `amount` of underlying asset into the reserve, receiving in return overlying aTokens.
* - E.g. User supplies 100 USDC and gets in return 100 aUSDC
* @param asset The address of the underlying asset to supply
* @param amount The amount to be supplied
* @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
* wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
* is a different wallet
* @param referralCode Code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
**/
function supply(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external;
/**
* @notice Supply with transfer approval of asset to be supplied done via permit function
* see: https://eips.ethereum.org/EIPS/eip-2612 and https://eips.ethereum.org/EIPS/eip-713
* @param asset The address of the underlying asset to supply
* @param amount The amount to be supplied
* @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
* wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
* is a different wallet
* @param deadline The deadline timestamp that the permit is valid
* @param referralCode Code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
* @param permitV The V parameter of ERC712 permit sig
* @param permitR The R parameter of ERC712 permit sig
* @param permitS The S parameter of ERC712 permit sig
**/
function supplyWithPermit(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode,
uint256 deadline,
uint8 permitV,
bytes32 permitR,
bytes32 permitS
) external;
/**
* @notice Withdraws an `amount` of underlying asset from the reserve, burning the equivalent aTokens owned
* E.g. User has 100 aUSDC, calls withdraw() and receives 100 USDC, burning the 100 aUSDC
* @param asset The address of the underlying asset to withdraw
* @param amount The underlying amount to be withdrawn
* - Send the value type(uint256).max in order to withdraw the whole aToken balance
* @param to The address that will receive the underlying, same as msg.sender if the user
* wants to receive it on his own wallet, or a different address if the beneficiary is a
* different wallet
* @return The final amount withdrawn
**/
function withdraw(
address asset,
uint256 amount,
address to
) external returns (uint256);
/**
* @notice Allows users to borrow a specific `amount` of the reserve underlying asset, provided that the borrower
* already supplied enough collateral, or he was given enough allowance by a credit delegator on the
* corresponding debt token (StableDebtToken or VariableDebtToken)
* - E.g. User borrows 100 USDC passing as `onBehalfOf` his own address, receiving the 100 USDC in his wallet
* and 100 stable/variable debt tokens, depending on the `interestRateMode`
* @param asset The address of the underlying asset to borrow
* @param amount The amount to be borrowed
* @param interestRateMode The interest rate mode at which the user wants to borrow: 1 for Stable, 2 for Variable
* @param referralCode The code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
* @param onBehalfOf The address of the user who will receive the debt. Should be the address of the borrower itself
* calling the function if he wants to borrow against his own collateral, or the address of the credit delegator
* if he has been given credit delegation allowance
**/
function borrow(
address asset,
uint256 amount,
uint256 interestRateMode,
uint16 referralCode,
address onBehalfOf
) external;
/**
* @notice Repays a borrowed `amount` on a specific reserve, burning the equivalent debt tokens owned
* - E.g. User repays 100 USDC, burning 100 variable/stable debt tokens of the `onBehalfOf` address
* @param asset The address of the borrowed underlying asset previously borrowed
* @param amount The amount to repay
* - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
* @param interestRateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
* @param onBehalfOf The address of the user who will get his debt reduced/removed. Should be the address of the
* user calling the function if he wants to reduce/remove his own debt, or the address of any other
* other borrower whose debt should be removed
* @return The final amount repaid
**/
function repay(
address asset,
uint256 amount,
uint256 interestRateMode,
address onBehalfOf
) external returns (uint256);
/**
* @notice Repay with transfer approval of asset to be repaid done via permit function
* see: https://eips.ethereum.org/EIPS/eip-2612 and https://eips.ethereum.org/EIPS/eip-713
* @param asset The address of the borrowed underlying asset previously borrowed
* @param amount The amount to repay
* - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
* @param interestRateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
* @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
* user calling the function if he wants to reduce/remove his own debt, or the address of any other
* other borrower whose debt should be removed
* @param deadline The deadline timestamp that the permit is valid
* @param permitV The V parameter of ERC712 permit sig
* @param permitR The R parameter of ERC712 permit sig
* @param permitS The S parameter of ERC712 permit sig
* @return The final amount repaid
**/
function repayWithPermit(
address asset,
uint256 amount,
uint256 interestRateMode,
address onBehalfOf,
uint256 deadline,
uint8 permitV,
bytes32 permitR,
bytes32 permitS
) external returns (uint256);
/**
* @notice Repays a borrowed `amount` on a specific reserve using the reserve aTokens, burning the
* equivalent debt tokens
* - E.g. User repays 100 USDC using 100 aUSDC, burning 100 variable/stable debt tokens
* @dev Passing uint256.max as amount will clean up any residual aToken dust balance, if the user aToken
* balance is not enough to cover the whole debt
* @param asset The address of the borrowed underlying asset previously borrowed
* @param amount The amount to repay
* - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
* @param interestRateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
* @return The final amount repaid
**/
function repayWithATokens(
address asset,
uint256 amount,
uint256 interestRateMode
) external returns (uint256);
/**
* @notice Allows a borrower to swap his debt between stable and variable mode, or vice versa
* @param asset The address of the underlying asset borrowed
* @param interestRateMode The current interest rate mode of the position being swapped: 1 for Stable, 2 for Variable
**/
function swapBorrowRateMode(
address asset,
uint256 interestRateMode
) external;
/**
* @notice Rebalances the stable interest rate of a user to the current stable rate defined on the reserve.
* - Users can be rebalanced if the following conditions are satisfied:
* 1. Usage ratio is above 95%
* 2. the current supply APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too
* much has been borrowed at a stable rate and suppliers are not earning enough
* @param asset The address of the underlying asset borrowed
* @param user The address of the user to be rebalanced
**/
function rebalanceStableBorrowRate(address asset, address user) external;
/**
* @notice Allows suppliers to enable/disable a specific supplied asset as collateral
* @param asset The address of the underlying asset supplied
* @param useAsCollateral True if the user wants to use the supply as collateral, false otherwise
**/
function setUserUseReserveAsCollateral(
address asset,
bool useAsCollateral
) external;
/**
* @notice Function to liquidate a non-healthy position collateral-wise, with Health Factor below 1
* - The caller (liquidator) covers `debtToCover` amount of debt of the user getting liquidated, and receives
* a proportionally amount of the `collateralAsset` plus a bonus to cover market risk
* @param collateralAsset The address of the underlying asset used as collateral, to receive as result of the liquidation
* @param debtAsset The address of the underlying borrowed asset to be repaid with the liquidation
* @param user The address of the borrower getting liquidated
* @param debtToCover The debt amount of borrowed `asset` the liquidator wants to cover
* @param receiveAToken True if the liquidators wants to receive the collateral aTokens, `false` if he wants
* to receive the underlying collateral asset directly
**/
function liquidationCall(
address collateralAsset,
address debtAsset,
address user,
uint256 debtToCover,
bool receiveAToken
) external;
/**
* @notice Allows smartcontracts to access the liquidity of the pool within one transaction,
* as long as the amount taken plus a fee is returned.
* @dev IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept
* into consideration. For further details please visit https://developers.aave.com
* @param receiverAddress The address of the contract receiving the funds, implementing IFlashLoanReceiver interface
* @param assets The addresses of the assets being flash-borrowed
* @param amounts The amounts of the assets being flash-borrowed
* @param interestRateModes Types of the debt to open if the flash loan is not returned:
* 0 -> Don't open any debt, just revert if funds can't be transferred from the receiver
* 1 -> Open debt at stable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
* 2 -> Open debt at variable rate for the value of the amount flash-borrowed to the `onBehalfOf` address
* @param onBehalfOf The address that will receive the debt in the case of using on `modes` 1 or 2
* @param params Variadic packed params to pass to the receiver as extra information
* @param referralCode The code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
**/
function flashLoan(
address receiverAddress,
address[] calldata assets,
uint256[] calldata amounts,
uint256[] calldata interestRateModes,
address onBehalfOf,
bytes calldata params,
uint16 referralCode
) external;
/**
* @notice Allows smartcontracts to access the liquidity of the pool within one transaction,
* as long as the amount taken plus a fee is returned.
* @dev IMPORTANT There are security concerns for developers of flashloan receiver contracts that must be kept
* into consideration. For further details please visit https://developers.aave.com
* @param receiverAddress The address of the contract receiving the funds, implementing IFlashLoanSimpleReceiver interface
* @param asset The address of the asset being flash-borrowed
* @param amount The amount of the asset being flash-borrowed
* @param params Variadic packed params to pass to the receiver as extra information
* @param referralCode The code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
**/
function flashLoanSimple(
address receiverAddress,
address asset,
uint256 amount,
bytes calldata params,
uint16 referralCode
) external;
/**
* @notice Returns the user account data across all the reserves
* @param user The address of the user
* @return totalCollateralBase The total collateral of the user in the base currency used by the price feed
* @return totalDebtBase The total debt of the user in the base currency used by the price feed
* @return availableBorrowsBase The borrowing power left of the user in the base currency used by the price feed
* @return currentLiquidationThreshold The liquidation threshold of the user
* @return ltv The loan to value of The user
* @return healthFactor The current health factor of the user
**/
function getUserAccountData(
address user
)
external
view
returns (
uint256 totalCollateralBase,
uint256 totalDebtBase,
uint256 availableBorrowsBase,
uint256 currentLiquidationThreshold,
uint256 ltv,
uint256 healthFactor
);
/**
* @notice Initializes a reserve, activating it, assigning an aToken and debt tokens and an
* interest rate strategy
* @dev Only callable by the PoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param aTokenAddress The address of the aToken that will be assigned to the reserve
* @param stableDebtAddress The address of the StableDebtToken that will be assigned to the reserve
* @param variableDebtAddress The address of the VariableDebtToken that will be assigned to the reserve
* @param interestRateStrategyAddress The address of the interest rate strategy contract
**/
function initReserve(
address asset,
address aTokenAddress,
address stableDebtAddress,
address variableDebtAddress,
address interestRateStrategyAddress
) external;
/**
* @notice Drop a reserve
* @dev Only callable by the PoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
**/
function dropReserve(address asset) external;
/**
* @notice Updates the address of the interest rate strategy contract
* @dev Only callable by the PoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param rateStrategyAddress The address of the interest rate strategy contract
**/
function setReserveInterestRateStrategyAddress(
address asset,
address rateStrategyAddress
) external;
/**
* @notice Sets the configuration bitmap of the reserve as a whole
* @dev Only callable by the PoolConfigurator contract
* @param asset The address of the underlying asset of the reserve
* @param configuration The new configuration bitmap
**/
function setConfiguration(
address asset,
DataTypesV3.ReserveConfigurationMap calldata configuration
) external;
/**
* @notice Returns the configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The configuration of the reserve
**/
function getConfiguration(
address asset
) external view returns (DataTypesV3.ReserveConfigurationMap memory);
/**
* @notice Returns the configuration of the user across all the reserves
* @param user The user address
* @return The configuration of the user
**/
function getUserConfiguration(
address user
) external view returns (DataTypesV3.UserConfigurationMap memory);
/**
* @notice Returns the normalized income normalized income of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The reserve's normalized income
*/
function getReserveNormalizedIncome(
address asset
) external view returns (uint256);
/**
* @notice Returns the normalized variable debt per unit of asset
* @param asset The address of the underlying asset of the reserve
* @return The reserve normalized variable debt
*/
function getReserveNormalizedVariableDebt(
address asset
) external view returns (uint256);
/**
* @notice Returns the state and configuration of the reserve
* @param asset The address of the underlying asset of the reserve
* @return The state and configuration data of the reserve
**/
function getReserveData(
address asset
) external view returns (DataTypesV3.ReserveData memory);
/**
* @notice Validates and finalizes an aToken transfer
* @dev Only callable by the overlying aToken of the `asset`
* @param asset The address of the underlying asset of the aToken
* @param from The user from which the aTokens are transferred
* @param to The user receiving the aTokens
* @param amount The amount being transferred/withdrawn
* @param balanceFromBefore The aToken balance of the `from` user before the transfer
* @param balanceToBefore The aToken balance of the `to` user before the transfer
*/
function finalizeTransfer(
address asset,
address from,
address to,
uint256 amount,
uint256 balanceFromBefore,
uint256 balanceToBefore
) external;
/**
* @notice Returns the list of the underlying assets of all the initialized reserves
* @dev It does not include dropped reserves
* @return The addresses of the underlying assets of the initialized reserves
**/
function getReservesList() external view returns (address[] memory);
/**
* @notice Returns the address of the underlying asset of a reserve by the reserve id as stored in the DataTypesV3.ReserveData struct
* @param id The id of the reserve as stored in the DataTypesV3.ReserveData struct
* @return The address of the reserve associated with id
**/
function getReserveAddressById(uint16 id) external view returns (address);
/**
* @notice Returns the PoolAddressesProvider connected to this contract
* @return The address of the PoolAddressesProvider
**/
function ADDRESSES_PROVIDER()
external
view
returns (IPoolAddressesProvider);
/**
* @notice Updates the protocol fee on the bridging
* @param bridgeProtocolFee The part of the premium sent to the protocol treasury
*/
function updateBridgeProtocolFee(uint256 bridgeProtocolFee) external;
/**
* @notice Updates flash loan premiums. Flash loan premium consists of two parts:
* - A part is sent to aToken holders as extra, one time accumulated interest
* - A part is collected by the protocol treasury
* @dev The total premium is calculated on the total borrowed amount
* @dev The premium to protocol is calculated on the total premium, being a percentage of `flashLoanPremiumTotal`
* @dev Only callable by the PoolConfigurator contract
* @param flashLoanPremiumTotal The total premium, expressed in bps
* @param flashLoanPremiumToProtocol The part of the premium sent to the protocol treasury, expressed in bps
*/
function updateFlashloanPremiums(
uint128 flashLoanPremiumTotal,
uint128 flashLoanPremiumToProtocol
) external;
/**
* @notice Configures a new category for the eMode.
* @dev In eMode, the protocol allows very high borrowing power to borrow assets of the same category.
* The category 0 is reserved as it's the default for volatile assets
* @param id The id of the category
* @param config The configuration of the category
*/
function configureEModeCategory(
uint8 id,
DataTypesV3.EModeCategory memory config
) external;
/**
* @notice Returns the data of an eMode category
* @param id The id of the category
* @return The configuration data of the category
*/
function getEModeCategoryData(
uint8 id
) external view returns (DataTypesV3.EModeCategory memory);
/**
* @notice Allows a user to use the protocol in eMode
* @param categoryId The id of the category
*/
function setUserEMode(uint8 categoryId) external;
/**
* @notice Returns the eMode the user is using
* @param user The address of the user
* @return The eMode id
*/
function getUserEMode(address user) external view returns (uint256);
/**
* @notice Resets the isolation mode total debt of the given asset to zero
* @dev It requires the given asset has zero debt ceiling
* @param asset The address of the underlying asset to reset the isolationModeTotalDebt
*/
function resetIsolationModeTotalDebt(address asset) external;
/**
* @notice Returns the percentage of available liquidity that can be borrowed at once at stable rate
* @return The percentage of available liquidity to borrow, expressed in bps
*/
function MAX_STABLE_RATE_BORROW_SIZE_PERCENT()
external
view
returns (uint256);
/**
* @notice Returns the total fee on flash loans
* @return The total fee on flashloans
*/
function FLASHLOAN_PREMIUM_TOTAL() external view returns (uint128);
/**
* @notice Returns the part of the bridge fees sent to protocol
* @return The bridge fee sent to the protocol treasury
*/
function BRIDGE_PROTOCOL_FEE() external view returns (uint256);
/**
* @notice Returns the part of the flashloan fees sent to protocol
* @return The flashloan fee sent to the protocol treasury
*/
function FLASHLOAN_PREMIUM_TO_PROTOCOL() external view returns (uint128);
/**
* @notice Returns the maximum number of reserves supported to be listed in this Pool
* @return The maximum number of reserves supported
*/
function MAX_NUMBER_RESERVES() external view returns (uint16);
/**
* @notice Mints the assets accrued through the reserve factor to the treasury in the form of aTokens
* @param assets The list of reserves for which the minting needs to be executed
**/
function mintToTreasury(address[] calldata assets) external;
/**
* @notice Rescue and transfer tokens locked in this contract
* @param token The address of the token
* @param to The address of the recipient
* @param amount The amount of token to transfer
*/
function rescueTokens(address token, address to, uint256 amount) external;
/**
* @notice Supplies an `amount` of underlying asset into the reserve, receiving in return overlying aTokens.
* - E.g. User supplies 100 USDC and gets in return 100 aUSDC
* @dev Deprecated: Use the `supply` function instead
* @param asset The address of the underlying asset to supply
* @param amount The amount to be supplied
* @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
* wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
* is a different wallet
* @param referralCode Code used to register the integrator originating the operation, for potential rewards.
* 0 if the action is executed directly by the user, without any middle-man
**/
function deposit(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external;
}
/**
* @title IInitializableAToken
* @author Aave
* @notice Interface for the initialize function on AToken
**/
interface IInitializableAToken {
/**
* @dev Emitted when an aToken is initialized
* @param underlyingAsset The address of the underlying asset
* @param pool The address of the associated pool
* @param treasury The address of the treasury
* @param incentivesController The address of the incentives controller for this aToken
* @param aTokenDecimals The decimals of the underlying
* @param aTokenName The name of the aToken
* @param aTokenSymbol The symbol of the aToken
* @param params A set of encoded parameters for additional initialization
**/
event Initialized(
address indexed underlyingAsset,
address indexed pool,
address treasury,
address incentivesController,
uint8 aTokenDecimals,
string aTokenName,
string aTokenSymbol,
bytes params
);
/**
* @notice Initializes the aToken
* @param pool The pool contract that is initializing this contract
* @param treasury The address of the Aave treasury, receiving the fees on this aToken
* @param underlyingAsset The address of the underlying asset of this aToken (E.g. WETH for aWETH)
* @param incentivesController The smart contract managing potential incentives distribution
* @param aTokenDecimals The decimals of the aToken, same as the underlying asset's
* @param aTokenName The name of the aToken
* @param aTokenSymbol The symbol of the aToken
* @param params A set of encoded parameters for additional initialization
*/
function initialize(
IPool pool,
address treasury,
address underlyingAsset,
IRewardsController incentivesController,
uint8 aTokenDecimals,
string calldata aTokenName,
string calldata aTokenSymbol,
bytes calldata params
) external;
}
/**
* @title IAToken
* @author Aave
* @notice Defines the basic interface for an AToken.
**/
interface IAToken is IERC20, IScaledBalanceToken, IInitializableAToken {
/**
* @dev Emitted during the transfer action
* @param from The user whose tokens are being transferred
* @param to The recipient
* @param value The amount being transferred
* @param index The next liquidity index of the reserve
**/
event BalanceTransfer(
address indexed from,
address indexed to,
uint256 value,
uint256 index
);
/**
* @notice Mints `amount` aTokens to `user`
* @param caller The address performing the mint
* @param onBehalfOf The address of the user that will receive the minted aTokens
* @param amount The amount of tokens getting minted
* @param index The next liquidity index of the reserve
* @return `true` if the the previous balance of the user was 0
*/
function mint(
address caller,
address onBehalfOf,
uint256 amount,
uint256 index
) external returns (bool);
/**
* @notice Burns aTokens from `user` and sends the equivalent amount of underlying to `receiverOfUnderlying`
* @dev In some instances, the mint event could be emitted from a burn transaction
* if the amount to burn is less than the interest that the user accrued
* @param from The address from which the aTokens will be burned
* @param receiverOfUnderlying The address that will receive the underlying
* @param amount The amount being burned
* @param index The next liquidity index of the reserve
**/
function burn(
address from,
address receiverOfUnderlying,
uint256 amount,
uint256 index
) external;
/**
* @notice Mints aTokens to the reserve treasury
* @param amount The amount of tokens getting minted
* @param index The next liquidity index of the reserve
*/
function mintToTreasury(uint256 amount, uint256 index) external;
/**
* @notice Transfers aTokens in the event of a borrow being liquidated, in case the liquidators reclaims the aToken
* @param from The address getting liquidated, current owner of the aTokens
* @param to The recipient
* @param value The amount of tokens getting transferred
**/
function transferOnLiquidation(
address from,
address to,
uint256 value
) external;
/**
* @notice Transfers the underlying asset to `target`.
* @dev Used by the Pool to transfer assets in borrow(), withdraw() and flashLoan()
* @param user The recipient of the underlying
* @param amount The amount getting transferred
**/
function transferUnderlyingTo(address user, uint256 amount) external;
/**
* @notice Handles the underlying received by the aToken after the transfer has been completed.
* @dev The default implementation is empty as with standard ERC20 tokens, nothing needs to be done after the
* transfer is concluded. However in the future there may be aTokens that allow for example to stake the underlying
* to receive LM rewards. In that case, `handleRepayment()` would perform the staking of the underlying asset.
* @param user The user executing the repayment
* @param amount The amount getting repaid
**/
function handleRepayment(address user, uint256 amount) external;
/**
* @notice Allow passing a signed message to approve spending
* @dev implements the permit function as for
* https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
* @param owner The owner of the funds
* @param spender The spender
* @param value The amount
* @param deadline The deadline timestamp, type(uint256).max for max deadline
* @param v Signature param
* @param s Signature param
* @param r Signature param
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the address of the incentives controller contract
**/
function getIncentivesController()
external
view
returns (IRewardsController);
/**
* @notice Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH)
* @return The address of the underlying asset
**/
function UNDERLYING_ASSET_ADDRESS() external view returns (address);
/**
* @notice Returns the address of the Aave treasury, receiving the fees on this aToken.
* @return Address of the Aave treasury
**/
function RESERVE_TREASURY_ADDRESS() external view returns (address);
/**
* @notice Get the domain separator for the token
* @dev Return cached value if chainId matches cache, otherwise recomputes separator
* @return The domain separator of the token at current chain
*/
function DOMAIN_SEPARATOR() external view returns (bytes32);
/**
* @notice Returns the nonce for owner.
* @param owner The address of the owner
* @return The nonce of the owner
**/
function nonces(address owner) external view returns (uint256);
/**
* @notice Rescue and transfer tokens locked in this contract
* @param token The address of the token
* @param to The address of the recipient
* @param amount The amount of token to transfer
*/
function rescueTokens(address token, address to, uint256 amount) external;
}
interface IStakedAave {
function stake(address to, uint256 amount) external;
function redeem(address to, uint256 amount) external;
function cooldown() external;
function claimRewards(address to, uint256 amount) external;
function getTotalRewardsBalance(address) external view returns (uint256);
function COOLDOWN_SECONDS() external view returns (uint256);
function stakersCooldowns(address) external view returns (uint256);
function UNSTAKE_WINDOW() external view returns (uint256);
}
// Swappers
/// @title Callback for IUniswapV3PoolActions#swap
/// @notice Any contract that calls IUniswapV3PoolActions#swap must implement this interface
interface IUniswapV3SwapCallback {
/// @notice Called to `msg.sender` after executing a swap via IUniswapV3Pool#swap.
/// @dev In the implementation you must pay the pool tokens owed for the swap.
/// The caller of this method must be checked to be a UniswapV3Pool deployed by the canonical UniswapV3Factory.
/// amount0Delta and amount1Delta can both be 0 if no tokens were swapped.
/// @param amount0Delta The amount of token0 that was sent (negative) or must be received (positive) by the pool by
/// the end of the swap. If positive, the callback must send that amount of token0 to the pool.
/// @param amount1Delta The amount of token1 that was sent (negative) or must be received (positive) by the pool by
/// the end of the swap. If positive, the callback must send that amount of token1 to the pool.
/// @param data Any data passed through by the caller via the IUniswapV3PoolActions#swap call
function uniswapV3SwapCallback(
int256 amount0Delta,
int256 amount1Delta,
bytes calldata data
) external;
}
/// @title Router token swapping functionality
/// @notice Functions for swapping tokens via Uniswap V3
interface ISwapRouter is IUniswapV3SwapCallback {
struct ExactInputSingleParams {
address tokenIn;
address tokenOut;
uint24 fee;
address recipient;
uint256 deadline;
uint256 amountIn;
uint256 amountOutMinimum;
uint160 sqrtPriceLimitX96;
}
/// @notice Swaps `amountIn` of one token for as much as possible of another token
/// @param params The parameters necessary for the swap, encoded as `ExactInputSingleParams` in calldata
/// @return amountOut The amount of the received token
function exactInputSingle(
ExactInputSingleParams calldata params
) external payable returns (uint256 amountOut);
struct ExactInputParams {
bytes path;
address recipient;
uint256 deadline;
uint256 amountIn;
uint256 amountOutMinimum;
}
/// @notice Swaps `amountIn` of one token for as much as possible of another along the specified path
/// @param params The parameters necessary for the multi-hop swap, encoded as `ExactInputParams` in calldata
/// @return amountOut The amount of the received token
function exactInput(
ExactInputParams calldata params
) external payable returns (uint256 amountOut);
struct ExactOutputSingleParams {
address tokenIn;
address tokenOut;
uint24 fee;
address recipient;
uint256 deadline;
uint256 amountOut;
uint256 amountInMaximum;
uint160 sqrtPriceLimitX96;
}
/// @notice Swaps as little as possible of one token for `amountOut` of another token
/// @param params The parameters necessary for the swap, encoded as `ExactOutputSingleParams` in calldata
/// @return amountIn The amount of the input token
function exactOutputSingle(
ExactOutputSingleParams calldata params
) external payable returns (uint256 amountIn);
struct ExactOutputParams {
bytes path;
address recipient;
uint256 deadline;
uint256 amountOut;
uint256 amountInMaximum;
}
/// @notice Swaps as little as possible of one token for `amountOut` of another along the specified path (reversed)
/// @param params The parameters necessary for the multi-hop swap, encoded as `ExactOutputParams` in calldata
/// @return amountIn The amount of the input token
function exactOutput(
ExactOutputParams calldata params
) external payable returns (uint256 amountIn);
// Taken from https://soliditydeveloper.com/uniswap3
// Manually added to the interface
function refundETH() external payable;
}
/**
* @title UniswapV3Swapper
* @author Yearn.finance
* @dev This is a simple contract that can be inherited by any tokenized
* strategy that would like to use Uniswap V3 for swaps. It hold all needed
* logic to perform both exact input and exact output swaps.
*
* The global address variables default to the ETH mainnet addresses but
* remain settable by the inheriting contract to allow for customization
* based on needs or chain its used on.
*
* The only variables that are required to be set are the specific fees
* for each token pair. The inheriting contract can use the {_setUniFees}
* function to easily set this for any token pairs needed.
*/
contract UniswapV3Swapper {
using SafeERC20 for ERC20;
// Optional Variable to be set to not sell dust.
uint256 public minAmountToSell;
// Defaults to WETH on mainnet.
address public base = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
// Defaults to Uniswap V3 router on mainnet.
address public router = 0xE592427A0AEce92De3Edee1F18E0157C05861564;
// Fees for the Uni V3 pools. Each fee should get set each way in
// the mapping so no matter the direction the correct fee will get
// returned for any two tokens.
mapping(address => mapping(address => uint24)) public uniFees;
/**
* @dev All fess will default to 0 on creation. A strategist will need
* To set the mapping for the tokens expected to swap. This function
* is to help set the mapping. It can be called internally during
* initialization, through permissioned functions etc.
*/
function _setUniFees(
address _token0,
address _token1,
uint24 _fee
) internal virtual {
uniFees[_token0][_token1] = _fee;
uniFees[_token1][_token0] = _fee;
}
/**
* @dev Used to swap a specific amount of `_from` to `_to`.
* This will check and handle all allowances as well as not swapping
* unless `_amountIn` is greater than the set `_minAmountOut`
*
* If one of the tokens matches with the `base` token it will do only
* one jump, otherwise will do two jumps.
*
* The corresponding uniFees for each token pair will need to be set
* other wise this function will revert.
*
* @param _from The token we are swapping from.
* @param _to The token we are swapping to.
* @param _amountIn The amount of `_from` we will swap.
* @param _minAmountOut The min of `_to` to get out.
* @return _amountOut The actual amount of `_to` that was swapped to
*/
function _swapFrom(
address _from,
address _to,
uint256 _amountIn,
uint256 _minAmountOut
) internal virtual returns (uint256 _amountOut) {
if (_amountIn > minAmountToSell) {
_checkAllowance(router, _from, _amountIn);
if (_from == base || _to == base) {
ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
.ExactInputSingleParams(
_from, // tokenIn
_to, // tokenOut
uniFees[_from][_to], // from-to fee
address(this), // recipient
block.timestamp, // deadline
_amountIn, // amountIn
_minAmountOut, // amountOut
0 // sqrtPriceLimitX96
);
_amountOut = ISwapRouter(router).exactInputSingle(params);
} else {
bytes memory path = abi.encodePacked(
_from, // tokenIn
uniFees[_from][base], // from-base fee
base, // base token
uniFees[base][_to], // base-to fee
_to // tokenOut
);
_amountOut = ISwapRouter(router).exactInput(
ISwapRouter.ExactInputParams(
path,
address(this),
block.timestamp,
_amountIn,
_minAmountOut
)
);
}
}
}
/**
* @dev Used to swap a specific amount of `_to` from `_from` unless
* it takes more than `_maxAmountFrom`.
*
* This will check and handle all allowances as well as not swapping
* unless `_maxAmountFrom` is greater than the set `minAmountToSell`
*
* If one of the tokens matches with the `base` token it will do only
* one jump, otherwise will do two jumps.
*
* The corresponding uniFees for each token pair will need to be set
* other wise this function will revert.
*
* @param _from The token we are swapping from.
* @param _to The token we are swapping to.
* @param _amountTo The amount of `_to` we need out.
* @param _maxAmountFrom The max of `_from` we will swap.
* @return _amountIn The actual amount of `_from` swapped.
*/
function _swapTo(
address _from,
address _to,
uint256 _amountTo,
uint256 _maxAmountFrom
) internal virtual returns (uint256 _amountIn) {
if (_maxAmountFrom > minAmountToSell) {
_checkAllowance(router, _from, _maxAmountFrom);
if (_from == base || _to == base) {
ISwapRouter.ExactOutputSingleParams memory params = ISwapRouter
.ExactOutputSingleParams(
_from, // tokenIn
_to, // tokenOut
uniFees[_from][_to], // from-to fee
address(this), // recipient
block.timestamp, // deadline
_amountTo, // amountOut
_maxAmountFrom, // maxAmountIn
0 // sqrtPriceLimitX96
);
_amountIn = ISwapRouter(router).exactOutputSingle(params);
} else {
bytes memory path = abi.encodePacked(
_to,
uniFees[base][_to], // base-to fee
base,
uniFees[_from][base], // from-base fee
_from
);
_amountIn = ISwapRouter(router).exactOutput(
ISwapRouter.ExactOutputParams(
path,
address(this),
block.timestamp,
_amountTo, // How much we want out
_maxAmountFrom
)
);
}
}
}
/**
* @dev Internal safe function to make sure the contract you want to
* interact with has enough allowance to pull the desired tokens.
*
* @param _contract The address of the contract that will move the token.
* @param _token The ERC-20 token that will be getting spent.
* @param _amount The amount of `_token` to be spent.
*/
function _checkAllowance(
address _contract,
address _token,
uint256 _amount
) internal virtual {
if (ERC20(_token).allowance(address(this), _contract) < _amount) {
ERC20(_token).safeApprove(_contract, 0);
ERC20(_token).safeApprove(_contract, _amount);
}
}
}
// Math library from https://github.com/ajna-finance/ajna-core/blob/master/src/libraries/internal/Maths.sol
/**
@title Maths library
@notice Internal library containing common maths.
*/
library Maths {
uint256 internal constant WAD = 1e18;
uint256 internal constant RAY = 1e27;
function wmul(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * y + WAD / 2) / WAD;
}
function floorWmul(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * y) / WAD;
}
function ceilWmul(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * y + WAD - 1) / WAD;
}
function wdiv(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * WAD + y / 2) / y;
}
function floorWdiv(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * WAD) / y;
}
function ceilWdiv(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * WAD + y - 1) / y;
}
function ceilDiv(uint256 x, uint256 y) internal pure returns (uint256) {
return (x + y - 1) / y;
}
function max(uint256 x, uint256 y) internal pure returns (uint256) {
return x >= y ? x : y;
}
function min(uint256 x, uint256 y) internal pure returns (uint256) {
return x <= y ? x : y;
}
function wad(uint256 x) internal pure returns (uint256) {
return x * WAD;
}
function rmul(uint256 x, uint256 y) internal pure returns (uint256) {
return (x * y + RAY / 2) / RAY;
}
function rpow(uint256 x, uint256 n) internal pure returns (uint256 z) {
z = n % 2 != 0 ? x : RAY;
for (n /= 2; n != 0; n /= 2) {
x = rmul(x, x);
if (n % 2 != 0) {
z = rmul(z, x);
}
}
}
/*************************/
/*** Integer Functions ***/
/*************************/
function maxInt(int256 x, int256 y) internal pure returns (int256) {
return x >= y ? x : y;
}
function minInt(int256 x, int256 y) internal pure returns (int256) {
return x <= y ? x : y;
}
}
contract Governance {
/// @notice Emitted when the governance address is updated.
event GovernanceTransferred(
address indexed previousGovernance,
address indexed newGovernance
);
modifier onlyGovernance() {
_checkGovernance();
_;
}
/// @notice Checks if the msg sender is the governance.
function _checkGovernance() internal view virtual {
require(governance == msg.sender, "!governance");
}
/// @notice Address that can set the default base fee and provider
address public governance;
constructor(address _governance) {
governance = _governance;
emit GovernanceTransferred(address(0), _governance);
}
/**
* @notice Sets a new address as the governance of the contract.
* @dev Throws if the caller is not current governance.
* @param _newGovernance The new governance address.
*/
function transferGovernance(
address _newGovernance
) external virtual onlyGovernance {
require(_newGovernance != address(0), "ZERO ADDRESS");
address oldGovernance = governance;
governance = _newGovernance;
emit GovernanceTransferred(oldGovernance, _newGovernance);
}
}
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)
/**
* @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].
*/
abstract 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() {
_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 making it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_nonReentrantBefore();
_;
_nonReentrantAfter();
}
function _nonReentrantBefore() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _nonReentrantAfter() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
/**
* @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
* `nonReentrant` function in the call stack.
*/
function _reentrancyGuardEntered() internal view returns (bool) {
return _status == _ENTERED;
}
}
interface ITaker {
function auctionTakeCallback(
bytes32 _auctionId,
address _sender,
uint256 _amountTaken,
uint256 _amountNeeded,
bytes calldata _data
) external;
}
/// @notice Interface that the optional `hook` contract should implement if the non-standard logic is desired.
interface IHook {
function kickable(address _fromToken) external view returns (uint256);
function auctionKicked(address _fromToken) external returns (uint256);
function preTake(
address _fromToken,
uint256 _amountToTake,
uint256 _amountToPay
) external;
function postTake(
address _toToken,
uint256 _amountTaken,
uint256 _amountPayed
) external;
}
/**
* @title Auction
* @author yearn.fi
* @notice General use dutch auction contract for token sales.
*/
contract Auction is Governance, ReentrancyGuard {
using SafeERC20 for ERC20;
/// @notice Emitted when a new auction is enabled
event AuctionEnabled(
bytes32 auctionId,
address indexed from,
address indexed to,
address indexed auctionAddress
);
/// @notice Emitted when an auction is disabled.
event AuctionDisabled(
bytes32 auctionId,
address indexed from,
address indexed to,
address indexed auctionAddress
);
/// @notice Emitted when auction has been kicked.
event AuctionKicked(bytes32 auctionId, uint256 available);
/// @notice Emitted when any amount of an active auction was taken.
event AuctionTaken(
bytes32 auctionId,
uint256 amountTaken,
uint256 amountLeft
);
/// @dev Store address and scaler in one slot.
struct TokenInfo {
address tokenAddress;
uint96 scaler;
}
/// @notice Store all the auction specific information.
struct AuctionInfo {
TokenInfo fromInfo;
uint96 kicked;
address receiver;
uint128 initialAvailable;
uint128 currentAvailable;
}
/// @notice Store the hook address and each flag in one slot.
struct Hook {
address hook;
bool kickable;
bool kick;
bool preTake;
bool postTake;
}
uint256 internal constant WAD = 1e18;
/// @notice Used for the price decay.
uint256 internal constant MINUTE_HALF_LIFE =
0.988514020352896135_356867505 * 1e27; // 0.5^(1/60)
/// @notice Struct to hold the info for `want`.
TokenInfo internal wantInfo;
/// @notice Contract to call during write functions.
Hook internal hook_;
/// @notice The amount to start the auction at.
uint256 public startingPrice;
/// @notice The time that each auction lasts.
uint256 public auctionLength;
/// @notice The minimum time to wait between auction 'kicks'.
uint256 public auctionCooldown;
/// @notice Mapping from an auction ID to its struct.
mapping(bytes32 => AuctionInfo) public auctions;
/// @notice Array of all the enabled auction for this contract.
bytes32[] public enabledAuctions;
constructor() Governance(msg.sender) {}
/**
* @notice Initializes the Auction contract with initial parameters.
* @param _want Address this auction is selling to.
* @param _hook Address of the hook contract (optional).
* @param _governance Address of the contract governance.
* @param _auctionLength Duration of each auction in seconds.
* @param _auctionCooldown Cooldown period between auctions in seconds.
* @param _startingPrice Starting price for each auction.
*/
function initialize(
address _want,
address _hook,
address _governance,
uint256 _auctionLength,
uint256 _auctionCooldown,
uint256 _startingPrice
) external virtual {
require(auctionLength == 0, "initialized");
require(_want != address(0), "ZERO ADDRESS");
require(_auctionLength != 0, "length");
require(_auctionLength < _auctionCooldown, "cooldown");
require(_startingPrice != 0, "starting price");
// Cannot have more than 18 decimals.
uint256 decimals = ERC20(_want).decimals();
require(decimals <= 18, "unsupported decimals");
// Set variables
wantInfo = TokenInfo({
tokenAddress: _want,
scaler: uint96(WAD / 10 ** decimals)
});
// If we are using a hook.
if (_hook != address(0)) {
// All flags default to true.
hook_ = Hook({
hook: _hook,
kickable: true,
kick: true,
preTake: true,
postTake: true
});
}
governance = _governance;
auctionLength = _auctionLength;
auctionCooldown = _auctionCooldown;
startingPrice = _startingPrice;
}
/*//////////////////////////////////////////////////////////////
VIEW METHODS
//////////////////////////////////////////////////////////////*/
/**
* @notice Get the address of this auctions want token.
* @return . The want token.
*/
function want() public view virtual returns (address) {
return wantInfo.tokenAddress;
}
/**
* @notice Get the address of the hook if any.
* @return . The hook.
*/
function hook() external view virtual returns (address) {
return hook_.hook;
}
/**
* @notice Get the current status of which hooks are being used.
* @return . If the kickable hook is used.
* @return . If the kick hook is used.
* @return . If the preTake hook is used.
* @return . If the postTake hook is used.
*/
function getHookFlags()
external
view
virtual
returns (bool, bool, bool, bool)
{
Hook memory _hook;
return (_hook.kickable, _hook.kick, _hook.preTake, _hook.postTake);
}
/**
* @notice Get the length of the enabled auctions array.
*/
function numberOfEnabledAuctions() external view virtual returns (uint256) {
return enabledAuctions.length;
}
/**
* @notice Get the unique auction identifier.
* @param _from The address of the token to sell.
* @return bytes32 A unique auction identifier.
*/
function getAuctionId(address _from) public view virtual returns (bytes32) {
return keccak256(abi.encodePacked(_from, want(), address(this)));
}
/**
* @notice Retrieves information about a specific auction.
* @param _auctionId The unique identifier of the auction.
* @return _from The address of the token to sell.
* @return _to The address of the token to buy.
* @return _kicked The timestamp of the last kick.
* @return _available The current available amount for the auction.
*/
function auctionInfo(
bytes32 _auctionId
)
public
view
virtual
returns (
address _from,
address _to,
uint256 _kicked,
uint256 _available
)
{
AuctionInfo memory auction = auctions[_auctionId];
return (
auction.fromInfo.tokenAddress,
want(),
auction.kicked,
auction.kicked + auctionLength > block.timestamp
? auction.currentAvailable
: 0
);
}
/**
* @notice Get the pending amount available for the next auction.
* @dev Defaults to the auctions balance of the from token if no hook.
* @param _auctionId The unique identifier of the auction.
* @return uint256 The amount that can be kicked into the auction.
*/
function kickable(
bytes32 _auctionId
) external view virtual returns (uint256) {
// If not enough time has passed then `kickable` is 0.
if (auctions[_auctionId].kicked + auctionCooldown > block.timestamp) {
return 0;
}
// Check if we have a hook to call.
Hook memory _hook = hook_;
if (_hook.kickable) {
// If so default to the hooks logic.
return
IHook(_hook.hook).kickable(
auctions[_auctionId].fromInfo.tokenAddress
);
} else {
// Else just use the full balance of this contract.
return
ERC20(auctions[_auctionId].fromInfo.tokenAddress).balanceOf(
address(this)
);
}
}
/**
* @notice Gets the amount of `want` needed to buy a specific amount of `from`.
* @param _auctionId The unique identifier of the auction.
* @param _amountToTake The amount of `from` to take in the auction.
* @return . The amount of `want` needed to fulfill the take amount.
*/
function getAmountNeeded(
bytes32 _auctionId,
uint256 _amountToTake
) external view virtual returns (uint256) {
return
_getAmountNeeded(
auctions[_auctionId],
_amountToTake,
block.timestamp
);
}
/**
* @notice Gets the amount of `want` needed to buy a specific amount of `from` at a specific timestamp.
* @param _auctionId The unique identifier of the auction.
* @param _amountToTake The amount `from` to take in the auction.
* @param _timestamp The specific timestamp for calculating the amount needed.
* @return . The amount of `want` needed to fulfill the take amount.
*/
function getAmountNeeded(
bytes32 _auctionId,
uint256 _amountToTake,
uint256 _timestamp
) external view virtual returns (uint256) {
return
_getAmountNeeded(auctions[_auctionId], _amountToTake, _timestamp);
}
/**
* @dev Return the amount of `want` needed to buy `_amountToTake`.
*/
function _getAmountNeeded(
AuctionInfo memory _auction,
uint256 _amountToTake,
uint256 _timestamp
) internal view virtual returns (uint256) {
return
// Scale _amountToTake to 1e18
(_amountToTake *
_auction.fromInfo.scaler *
// Price is always 1e18
_price(
_auction.kicked,
_auction.initialAvailable * _auction.fromInfo.scaler,
_timestamp
)) /
1e18 /
// Scale back down to want.
wantInfo.scaler;
}
/**
* @notice Gets the price of the auction at the current timestamp.
* @param _auctionId The unique identifier of the auction.
* @return . The price of the auction.
*/
function price(bytes32 _auctionId) external view virtual returns (uint256) {
return price(_auctionId, block.timestamp);
}
/**
* @notice Gets the price of the auction at a specific timestamp.
* @param _auctionId The unique identifier of the auction.
* @param _timestamp The specific timestamp for calculating the price.
* @return . The price of the auction.
*/
function price(
bytes32 _auctionId,
uint256 _timestamp
) public view virtual returns (uint256) {
// Get unscaled price and scale it down.
return
_price(
auctions[_auctionId].kicked,
auctions[_auctionId].initialAvailable *
auctions[_auctionId].fromInfo.scaler,
_timestamp
) / wantInfo.scaler;
}
/**
* @dev Internal function to calculate the scaled price based on auction parameters.
* @param _kicked The timestamp the auction was kicked.
* @param _available The initial available amount scaled 1e18.
* @param _timestamp The specific timestamp for calculating the price.
* @return . The calculated price scaled to 1e18.
*/
function _price(
uint256 _kicked,
uint256 _available,
uint256 _timestamp
) internal view virtual returns (uint256) {
if (_available == 0) return 0;
uint256 secondsElapsed = _timestamp - _kicked;
if (secondsElapsed > auctionLength) return 0;
// Exponential decay from https://github.com/ajna-finance/ajna-core/blob/master/src/libraries/helpers/PoolHelper.sol
uint256 hoursComponent = 1e27 >> (secondsElapsed / 3600);
uint256 minutesComponent = Maths.rpow(
MINUTE_HALF_LIFE,
(secondsElapsed % 3600) / 60
);
uint256 initialPrice = Maths.wdiv(startingPrice * 1e18, _available);
return
(initialPrice * Maths.rmul(hoursComponent, minutesComponent)) /
1e27;
}
/*//////////////////////////////////////////////////////////////
SETTERS
//////////////////////////////////////////////////////////////*/
/**
* @notice Enables a new auction.
* @dev Uses governance as the receiver.
* @param _from The address of the token to be auctioned.
* @return . The unique identifier of the enabled auction.
*/
function enable(address _from) external virtual returns (bytes32) {
return enable(_from, msg.sender);
}
/**
* @notice Enables a new auction.
* @param _from The address of the token to be auctioned.
* @param _receiver The address that will receive the funds in the auction.
* @return _auctionId The unique identifier of the enabled auction.
*/
function enable(
address _from,
address _receiver
) public virtual onlyGovernance returns (bytes32 _auctionId) {
address _want = want();
require(_from != address(0) && _from != _want, "ZERO ADDRESS");
require(
_receiver != address(0) && _receiver != address(this),
"receiver"
);
// Cannot have more than 18 decimals.
uint256 decimals = ERC20(_from).decimals();
require(decimals <= 18, "unsupported decimals");
// Calculate the id.
_auctionId = getAuctionId(_from);
require(
auctions[_auctionId].fromInfo.tokenAddress == address(0),
"already enabled"
);
// Store all needed info.
auctions[_auctionId].fromInfo = TokenInfo({
tokenAddress: _from,
scaler: uint96(WAD / 10 ** decimals)
});
auctions[_auctionId].receiver = _receiver;
// Add to the array.
enabledAuctions.push(_auctionId);
emit AuctionEnabled(_auctionId, _from, _want, address(this));
}
/**
* @notice Disables an existing auction.
* @dev Only callable by governance.
* @param _from The address of the token being sold.
*/
function disable(address _from) external virtual {
disable(_from, 0);
}
/**
* @notice Disables an existing auction.
* @dev Only callable by governance.
* @param _from The address of the token being sold.
* @param _index The index the auctionId is at in the array.
*/
function disable(
address _from,
uint256 _index
) public virtual onlyGovernance {
bytes32 _auctionId = getAuctionId(_from);
// Make sure the auction was enabled.
require(
auctions[_auctionId].fromInfo.tokenAddress != address(0),
"not enabled"
);
// Remove the struct.
delete auctions[_auctionId];
// Remove the auction ID from the array.
bytes32[] memory _enabledAuctions = enabledAuctions;
if (_enabledAuctions[_index] != _auctionId) {
// If the _index given is not the id find it.
for (uint256 i = 0; i < _enabledAuctions.length; ++i) {
if (_enabledAuctions[i] == _auctionId) {
_index = i;
break;
}
}
}
// Move the id to the last spot if not there.
if (_index < _enabledAuctions.length - 1) {
_enabledAuctions[_index] = _enabledAuctions[
_enabledAuctions.length - 1
];
// Update the array.
enabledAuctions = _enabledAuctions;
}
// Pop the id off the array.
enabledAuctions.pop();
emit AuctionDisabled(_auctionId, _from, want(), address(this));
}
/**
* @notice Set the flags to be used with hook.
* @param _kickable If the kickable hook should be used.
* @param _kick If the kick hook should be used.
* @param _preTake If the preTake hook should be used.
* @param _postTake If the postTake should be used.
*/
function setHookFlags(
bool _kickable,
bool _kick,
bool _preTake,
bool _postTake
) external virtual onlyGovernance {
address _hook = hook_.hook;
require(_hook != address(0), "no hook set");
hook_ = Hook({
hook: _hook,
kickable: _kickable,
kick: _kick,
preTake: _preTake,
postTake: _postTake
});
}
/*//////////////////////////////////////////////////////////////
PARTICIPATE IN AUCTION
//////////////////////////////////////////////////////////////*/
/**
* @notice Kicks off an auction, updating its status and making funds available for bidding.
* @param _auctionId The unique identifier of the auction.
* @return available The available amount for bidding on in the auction.
*/
function kick(
bytes32 _auctionId
) external virtual nonReentrant returns (uint256 available) {
address _fromToken = auctions[_auctionId].fromInfo.tokenAddress;
require(_fromToken != address(0), "not enabled");
require(
block.timestamp > auctions[_auctionId].kicked + auctionCooldown,
"too soon"
);
Hook memory _hook = hook_;
// Use hook if defined.
if (_hook.kick) {
available = IHook(_hook.hook).auctionKicked(_fromToken);
} else {
// Else just use current balance.
available = ERC20(_fromToken).balanceOf(address(this));
}
require(available != 0, "nothing to kick");
// Update the auctions status.
auctions[_auctionId].kicked = uint96(block.timestamp);
auctions[_auctionId].initialAvailable = uint128(available);
auctions[_auctionId].currentAvailable = uint128(available);
emit AuctionKicked(_auctionId, available);
}
/**
* @notice Take the token being sold in a live auction.
* @dev Defaults to taking the full amount and sending to the msg sender.
* @param _auctionId The unique identifier of the auction.
* @return . The amount of fromToken taken in the auction.
*/
function take(bytes32 _auctionId) external virtual returns (uint256) {
return _take(_auctionId, type(uint256).max, msg.sender, new bytes(0));
}
/**
* @notice Take the token being sold in a live auction with a specified maximum amount.
* @dev Uses the sender's address as the receiver.
* @param _auctionId The unique identifier of the auction.
* @param _maxAmount The maximum amount of fromToken to take in the auction.
* @return . The amount of fromToken taken in the auction.
*/
function take(
bytes32 _auctionId,
uint256 _maxAmount
) external virtual returns (uint256) {
return _take(_auctionId, _maxAmount, msg.sender, new bytes(0));
}
/**
* @notice Take the token being sold in a live auction.
* @param _auctionId The unique identifier of the auction.
* @param _maxAmount The maximum amount of fromToken to take in the auction.
* @param _receiver The address that will receive the fromToken.
* @return _amountTaken The amount of fromToken taken in the auction.
*/
function take(
bytes32 _auctionId,
uint256 _maxAmount,
address _receiver
) external virtual returns (uint256) {
return _take(_auctionId, _maxAmount, _receiver, new bytes(0));
}
/**
* @notice Take the token being sold in a live auction.
* @param _auctionId The unique identifier of the auction.
* @param _maxAmount The maximum amount of fromToken to take in the auction.
* @param _receiver The address that will receive the fromToken.
* @param _data The data signify the callback should be used and sent with it.
* @return _amountTaken The amount of fromToken taken in the auction.
*/
function take(
bytes32 _auctionId,
uint256 _maxAmount,
address _receiver,
bytes calldata _data
) external virtual returns (uint256) {
return _take(_auctionId, _maxAmount, _receiver, _data);
}
/// @dev Implements the take of the auction.
function _take(
bytes32 _auctionId,
uint256 _maxAmount,
address _receiver,
bytes memory _data
) internal virtual nonReentrant returns (uint256 _amountTaken) {
AuctionInfo memory auction = auctions[_auctionId];
// Make sure the auction is active.
require(
auction.kicked + auctionLength >= block.timestamp,
"not kicked"
);
// Max amount that can be taken.
_amountTaken = auction.currentAvailable > _maxAmount
? _maxAmount
: auction.currentAvailable;
// Get the amount needed
uint256 needed = _getAmountNeeded(
auction,
_amountTaken,
block.timestamp
);
require(needed != 0, "zero needed");
// How much is left in this auction.
uint256 left;
unchecked {
left = auction.currentAvailable - _amountTaken;
}
auctions[_auctionId].currentAvailable = uint128(left);
Hook memory _hook = hook_;
if (_hook.preTake) {
// Use hook if defined.
IHook(_hook.hook).preTake(
auction.fromInfo.tokenAddress,
_amountTaken,
needed
);
}
// Send `from`.
ERC20(auction.fromInfo.tokenAddress).safeTransfer(
_receiver,
_amountTaken
);
// If the caller has specified data.
if (_data.length != 0) {
// Do the callback.
ITaker(_receiver).auctionTakeCallback(
_auctionId,
msg.sender,
_amountTaken,
needed,
_data
);
}
// Cache the want address.
address _want = want();
// Pull `want`.
ERC20(_want).safeTransferFrom(msg.sender, auction.receiver, needed);
// Post take hook if defined.
if (_hook.postTake) {
IHook(_hook.hook).postTake(_want, _amountTaken, needed);
}
emit AuctionTaken(_auctionId, _amountTaken, left);
}
}
contract Clonable {
/// @notice Set to the address to auto clone from.
address public original;
/**
* @notice Clone the contracts default `original` contract.
* @return Address of the new Minimal Proxy clone.
*/
function _clone() internal virtual returns (address) {
return _clone(original);
}
/**
* @notice Clone any `_original` contract.
* @return _newContract Address of the new Minimal Proxy clone.
*/
function _clone(
address _original
) internal virtual returns (address _newContract) {
// Copied from https://github.com/optionality/clone-factory/blob/master/contracts/CloneFactory.sol
bytes20 addressBytes = bytes20(_original);
assembly {
// EIP-1167 bytecode
let clone_code := mload(0x40)
mstore(
clone_code,
0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000
)
mstore(add(clone_code, 0x14), addressBytes)
mstore(
add(clone_code, 0x28),
0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000
)
_newContract := create(0, clone_code, 0x37)
}
}
}
/// @title AuctionFactory
/// @notice Deploy a new Auction.
contract AuctionFactory is Clonable {
event DeployedNewAuction(address indexed auction, address indexed want);
/// @notice The time that each auction lasts.
uint256 public constant DEFAULT_AUCTION_LENGTH = 1 days;
/// @notice The minimum time to wait between auction 'kicks'.
uint256 public constant DEFAULT_AUCTION_COOLDOWN = 5 days;
/// @notice The amount to start the auction with.
uint256 public constant DEFAULT_STARTING_PRICE = 1_000_000;
/// @notice Full array of all auctions deployed through this factory.
address[] public auctions;
constructor() {
// Deploy the original
original = address(new Auction());
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(address _want) external returns (address) {
return
_createNewAuction(
_want,
address(0),
msg.sender,
DEFAULT_AUCTION_LENGTH,
DEFAULT_AUCTION_COOLDOWN,
DEFAULT_STARTING_PRICE
);
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @param _hook Address of the hook contract if any.
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(
address _want,
address _hook
) external returns (address) {
return
_createNewAuction(
_want,
_hook,
msg.sender,
DEFAULT_AUCTION_LENGTH,
DEFAULT_AUCTION_COOLDOWN,
DEFAULT_STARTING_PRICE
);
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @param _hook Address of the hook contract if any.
* @param _governance Address allowed to enable and disable auctions.
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(
address _want,
address _hook,
address _governance
) external returns (address) {
return
_createNewAuction(
_want,
_hook,
_governance,
DEFAULT_AUCTION_LENGTH,
DEFAULT_AUCTION_COOLDOWN,
DEFAULT_STARTING_PRICE
);
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @param _hook Address of the hook contract if any.
* @param _governance Address allowed to enable and disable auctions.
* @param _auctionLength Length of the auction in seconds.
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(
address _want,
address _hook,
address _governance,
uint256 _auctionLength
) external returns (address) {
return
_createNewAuction(
_want,
_hook,
_governance,
_auctionLength,
DEFAULT_AUCTION_COOLDOWN,
DEFAULT_STARTING_PRICE
);
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @param _hook Address of the hook contract if any.
* @param _governance Address allowed to enable and disable auctions.
* @param _auctionLength Length of the auction in seconds.
* @param _auctionCooldown Minimum time period between kicks in seconds.
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(
address _want,
address _hook,
address _governance,
uint256 _auctionLength,
uint256 _auctionCooldown
) external returns (address) {
return
_createNewAuction(
_want,
_hook,
_governance,
_auctionLength,
_auctionCooldown,
DEFAULT_STARTING_PRICE
);
}
/**
* @notice Creates a new auction contract.
* @param _want Address of the token users will bid with.
* @param _hook Address of the hook contract if any.
* @param _governance Address allowed to enable and disable auctions.
* @param _auctionLength Length of the auction in seconds.
* @param _auctionCooldown Minimum time period between kicks in seconds.
* @param _startingPrice Starting price for the auction (no decimals).
* NOTE: The starting price should be without decimals (1k == 1_000).
* @return _newAuction Address of the newly created auction contract.
*/
function createNewAuction(
address _want,
address _hook,
address _governance,
uint256 _auctionLength,
uint256 _auctionCooldown,
uint256 _startingPrice
) external returns (address) {
return
_createNewAuction(
_want,
_hook,
_governance,
_auctionLength,
_auctionCooldown,
_startingPrice
);
}
/**
* @dev Deploys and initializes a new Auction
*/
function _createNewAuction(
address _want,
address _hook,
address _governance,
uint256 _auctionLength,
uint256 _auctionCooldown,
uint256 _startingPrice
) internal returns (address _newAuction) {
_newAuction = _clone();
Auction(_newAuction).initialize(
_want,
_hook,
_governance,
_auctionLength,
_auctionCooldown,
_startingPrice
);
auctions.push(_newAuction);
emit DeployedNewAuction(_newAuction, _want);
}
/**
* @notice Get the full list of auctions deployed through this factory.
*/
function getAllAuctions() external view returns (address[] memory) {
return auctions;
}
/**
* @notice Get the total number of auctions deployed through this factory.
*/
function numberOfAuctions() external view returns (uint256) {
return auctions.length;
}
}
/**
* @title AuctionSwapper
* @author yearn.fi
* @dev Helper contract for a strategy to use dutch auctions for token sales.
*
* This contract is meant to be inherited by a V3 strategy in order
* to easily integrate dutch auctions into a contract for token swaps.
*
* The strategist will need to implement a way to call `_enableAuction`
* for an token pair they want to use, or a setter to manually set the
* `auction` contract.
*
* The contract comes with all of the needed function to act as a `hook`
* contract for the specific auction contract with the ability to override
* any of the functions to implement custom hooks.
*
* NOTE: If any hooks are not desired, the strategist should also
* implement a way to call the {setHookFlags} on the auction contract
* to avoid unnecessary gas for unused functions.
*/
contract AuctionSwapper {
using SafeERC20 for ERC20;
modifier onlyAuction() {
_isAuction();
_;
}
/**
* @dev Check the caller is the auction contract for hooks.
*/
function _isAuction() internal view virtual {
require(msg.sender == auction, "!auction");
}
/// @notice The pre-deployed Auction factory for cloning.
address public constant auctionFactory =
0x4A14145C4977E18c719BB70E6FcBF8fBFF6F62d2;
/// @notice Address of the specific Auction this strategy uses.
address public auction;
/*//////////////////////////////////////////////////////////////
AUCTION STARTING AND STOPPING
//////////////////////////////////////////////////////////////*/
function _enableAuction(
address _from,
address _want
) internal virtual returns (bytes32) {
return _enableAuction(_from, _want, 1 days, 3 days, 1e6);
}
/**
* @dev Used to enable a new Auction to sell `_from` to `_want`.
* If this is the first auction enabled it will deploy a new `auction`
* contract to use from the factory.
*
* NOTE: This only supports one `_want` token per strategy.
*
* @param _from Token to sell
* @param _want Token to buy.
* @return .The auction ID.
*/
function _enableAuction(
address _from,
address _want,
uint256 _auctionLength,
uint256 _auctionCooldown,
uint256 _startingPrice
) internal virtual returns (bytes32) {
address _auction = auction;
// If this is the first auction.
if (_auction == address(0)) {
// Deploy a new auction
_auction = AuctionFactory(auctionFactory).createNewAuction(
_want,
address(this),
address(this),
_auctionLength,
_auctionCooldown,
_startingPrice
);
// Store it for future use.
auction = _auction;
} else {
// Can only use one `want` per auction contract.
require(Auction(_auction).want() == _want, "wrong want");
}
// Enable new auction for `_from` token.
return Auction(_auction).enable(_from);
}
/**
* @dev Disable an auction for a given token.
* @param _from The token that was being sold.
*/
function _disableAuction(address _from) internal virtual {
Auction(auction).disable(_from);
}
/*//////////////////////////////////////////////////////////////
OPTIONAL AUCTION HOOKS
//////////////////////////////////////////////////////////////*/
/**
* @notice Return how much `_token` could currently be kicked into auction.
* @dev This can be overridden by a strategist to implement custom logic.
* @param _token Address of the `_from` token.
* @return . The amount of `_token` ready to be auctioned off.
*/
function kickable(address _token) public view virtual returns (uint256) {
return ERC20(_token).balanceOf(address(this));
}
/**
* @dev To override if something other than just sending the loose balance
* of `_token` to the auction is desired, such as accruing and and claiming rewards.
*
* @param _token Address of the token being auctioned off
*/
function _auctionKicked(address _token) internal virtual returns (uint256) {
// Send any loose balance to the auction.
uint256 balance = ERC20(_token).balanceOf(address(this));
if (balance != 0) ERC20(_token).safeTransfer(auction, balance);
return ERC20(_token).balanceOf(auction);
}
/**
* @dev To override if something needs to be done before a take is completed.
* This can be used if the auctioned token only will be freed up when a `take`
* occurs.
* @param _token Address of the token being taken.
* @param _amountToTake Amount of `_token` needed.
* @param _amountToPay Amount of `want` that will be payed.
*/
function _preTake(
address _token,
uint256 _amountToTake,
uint256 _amountToPay
) internal virtual {}
/**
* @dev To override if a post take action is desired.
*
* This could be used to re-deploy the bought token back into the yield source,
* or in conjunction with {_preTake} to check that the price sold at was within
* some allowed range.
*
* @param _token Address of the token that the strategy was sent.
* @param _amountTaken Amount of the from token taken.
* @param _amountPayed Amount of `_token` that was sent to the strategy.
*/
function _postTake(
address _token,
uint256 _amountTaken,
uint256 _amountPayed
) internal virtual {}
/*//////////////////////////////////////////////////////////////
AUCTION HOOKS
//////////////////////////////////////////////////////////////*/
/**
* @notice External hook for the auction to call during a `kick`.
* @dev Will call the internal version for the strategist to override.
* @param _token Token being kicked into auction.
* @return . The amount of `_token` to be auctioned off.
*/
function auctionKicked(
address _token
) external virtual onlyAuction returns (uint256) {
return _auctionKicked(_token);
}
/**
* @notice External hook for the auction to call before a `take`.
* @dev Will call the internal version for the strategist to override.
* @param _token Token being taken in the auction.
* @param _amountToTake The amount of `_token` to be sent to the taker.
* @param _amountToPay Amount of `want` that will be payed.
*/
function preTake(
address _token,
uint256 _amountToTake,
uint256 _amountToPay
) external virtual onlyAuction {
_preTake(_token, _amountToTake, _amountToPay);
}
/**
* @notice External hook for the auction to call after a `take` completed.
* @dev Will call the internal version for the strategist to override.
* @param _token The `want` token that was sent to the strategy.
* @param _amountTaken Amount of the from token taken.
* @param _amountPayed Amount of `_token` that was sent to the strategy.
*/
function postTake(
address _token,
uint256 _amountTaken,
uint256 _amountPayed
) external virtual onlyAuction {
_postTake(_token, _amountTaken, _amountPayed);
}
}
contract AaveV3Lender is BaseStrategy, UniswapV3Swapper, AuctionSwapper {
using SafeERC20 for ERC20;
// The pool to deposit and withdraw through.
IPool public constant lendingPool =
IPool(0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2);
IStakedAave internal constant stkAave =
IStakedAave(0x4da27a545c0c5B758a6BA100e3a049001de870f5);
address internal constant AAVE =
address(0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9);
// To get the Supply cap of an asset.
uint256 internal constant SUPPLY_CAP_MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFF000000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFF; // prettier-ignore
uint256 internal constant SUPPLY_CAP_START_BIT_POSITION = 116;
uint256 internal immutable decimals;
// The a Token specific rewards contract for claiming rewards.
IRewardsController public immutable rewardsController;
// The token that we get in return for deposits.
IAToken public immutable aToken;
// Bool to decide to try and claim rewards. Defaults to True.
bool public claimRewards = true;
// If rewards should be sold through Auctions.
bool public useAuction = true;
// Mapping to be set by management for any reward tokens.
// This can be used to set different mins for different tokens
// or to set to uin256.max if selling a reward token is reverting
// to allow for reports to still work properly.
mapping(address => uint256) public minAmountToSellMapping;
constructor(
address _asset,
string memory _name
) BaseStrategy(_asset, _name) {
// Set the aToken based on the asset we are using.
aToken = IAToken(lendingPool.getReserveData(_asset).aTokenAddress);
// Make sure its a real token.
require(address(aToken) != address(0), "!aToken");
// Get aToken decimals for supply caps.
decimals = ERC20(address(aToken)).decimals();
// Set the rewards controller
rewardsController = aToken.getIncentivesController();
// Make approve the lending pool for cheaper deposits.
asset.safeApprove(address(lendingPool), type(uint256).max);
// Set uni swapper values
// We will use the minAmountToSell mapping instead.
minAmountToSell = 0;
base = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
router = 0xE592427A0AEce92De3Edee1F18E0157C05861564;
}
/**
* @notice Set the uni fees for swaps.
* @dev External function available to management to set
* the fees used in the `UniswapV3Swapper.
*
* Any incentivized tokens will need a fee to be set for each
* reward token that it wishes to swap on reports.
*
* @param _token0 The first token of the pair.
* @param _token1 The second token of the pair.
* @param _fee The fee to be used for the pair.
*/
function setUniFees(
address _token0,
address _token1,
uint24 _fee
) external onlyManagement {
_setUniFees(_token0, _token1, _fee);
}
/*//////////////////////////////////////////////////////////////
NEEDED TO BE OVERRIDDEN BY STRATEGIST
//////////////////////////////////////////////////////////////*/
/**
* @dev Should deploy up to '_amount' of 'asset' in the yield source.
*
* This function is called at the end of a {deposit} or {mint}
* call. Meaning that unless a whitelist is implemented it will
* be entirely permissionless and thus can be sandwiched or otherwise
* manipulated.
*
* @param _amount The amount of 'asset' that the strategy should attempt
* to deposit in the yield source.
*/
function _deployFunds(uint256 _amount) internal override {
lendingPool.supply(address(asset), _amount, address(this), 0);
}
/**
* @dev Will attempt to free the '_amount' of 'asset'.
*
* The amount of 'asset' that is already loose has already
* been accounted for.
*
* This function is called during {withdraw} and {redeem} calls.
* Meaning that unless a whitelist is implemented it will be
* entirely permissionless and thus can be sandwiched or otherwise
* manipulated.
*
* Should not rely on asset.balanceOf(address(this)) calls other than
* for diff accounting purposes.
*
* Any difference between `_amount` and what is actually freed will be
* counted as a loss and passed on to the withdrawer. This means
* care should be taken in times of illiquidity. It may be better to revert
* if withdraws are simply illiquid so not to realize incorrect losses.
*
* Any difference between `_amount` and what is actually freed will be
* counted as a loss and passed on to the withdrawer. This means
* care should be taken in times of illiquidity. It may be better to revert
* if withdraws are simply illiquid so not to realize incorrect losses.
*
* @param _amount, The amount of 'asset' to be freed.
*/
function _freeFunds(uint256 _amount) internal override {
lendingPool.withdraw(
address(asset),
Math.min(aToken.balanceOf(address(this)), _amount),
address(this)
);
}
/**
* @dev Internal function to harvest all rewards, redeploy any idle
* funds and return an accurate accounting of all funds currently
* held by the Strategy.
*
* This should do any needed harvesting, rewards selling, accrual,
* redepositing etc. to get the most accurate view of current assets.
*
* NOTE: All applicable assets including loose assets should be
* accounted for in this function.
*
* Care should be taken when relying on oracles or swap values rather
* than actual amounts as all Strategy profit/loss accounting will
* be done based on this returned value.
*
* This can still be called post a shutdown, a strategist can check
* `TokenizedStrategy.isShutdown()` to decide if funds should be
* redeployed or simply realize any profits/losses.
*
* @return _totalAssets A trusted and accurate account for the total
* amount of 'asset' the strategy currently holds including idle funds.
*/
function _harvestAndReport()
internal
override
returns (uint256 _totalAssets)
{
if (claimRewards) {
// Claim and sell any rewards to `asset`.
_claimAndSellRewards();
}
_totalAssets = aToken.balanceOf(address(this)) + balanceOfAsset();
}
function balanceOfAsset() public view returns (uint256) {
return asset.balanceOf(address(this));
}
/**
* @notice Used to claim any pending rewards and sell them to asset.
*/
function _claimAndSellRewards() internal {
// Claim any pending stkAave.
_redeemAave();
//claim all rewards
address[] memory assets = new address[](1);
assets[0] = address(aToken);
(address[] memory rewardsList, ) = rewardsController
.claimAllRewardsToSelf(assets);
// Start cooldown on any new stkAave.
_harvestStkAave();
// If using the Auction contract we are done.
if (useAuction) return;
// Else swap as much as possible back to asset through uni.
address token;
for (uint256 i = 0; i < rewardsList.length; ++i) {
token = rewardsList[i];
if (token == address(asset)) {
continue;
} else if (token == address(stkAave)) {
// We swap Aave => asset
token = AAVE;
}
uint256 balance = ERC20(token).balanceOf(address(this));
if (balance > minAmountToSellMapping[token]) {
_swapFrom(token, address(asset), balance, 0);
}
}
}
function _redeemAave() internal {
if (!checkCooldown()) {
return;
}
uint256 stkAaveBalance = ERC20(address(stkAave)).balanceOf(
address(this)
);
if (stkAaveBalance > 0) {
stkAave.redeem(address(this), stkAaveBalance);
}
}
function checkCooldown() public view returns (bool) {
uint256 cooldownStartTimestamp = IStakedAave(stkAave).stakersCooldowns(
address(this)
);
if (cooldownStartTimestamp == 0) return false;
uint256 COOLDOWN_SECONDS = IStakedAave(stkAave).COOLDOWN_SECONDS();
uint256 UNSTAKE_WINDOW = IStakedAave(stkAave).UNSTAKE_WINDOW();
if (block.timestamp >= cooldownStartTimestamp + COOLDOWN_SECONDS) {
return
block.timestamp - (cooldownStartTimestamp + COOLDOWN_SECONDS) <=
UNSTAKE_WINDOW;
} else {
return false;
}
}
function _harvestStkAave() internal {
// request start of cooldown period
if (ERC20(address(stkAave)).balanceOf(address(this)) > 0) {
stkAave.cooldown();
}
}
function manualRedeemAave() external onlyKeepers {
_redeemAave();
}
/**
* @notice Gets the max amount of `asset` that an address can deposit.
* @dev Defaults to an unlimited amount for any address. But can
* be overridden by strategists.
*
* This function will be called before any deposit or mints to enforce
* any limits desired by the strategist. This can be used for either a
* traditional deposit limit or for implementing a whitelist etc.
*
* EX:
* if(isAllowed[_owner]) return super.availableDepositLimit(_owner);
*
* This does not need to take into account any conversion rates
* from shares to assets. But should know that any non max uint256
* amounts may be converted to shares. So it is recommended to keep
* custom amounts low enough as not to cause overflow when multiplied
* by `totalSupply`.
*
* @param . The address that is depositing into the strategy.
* @return . The available amount the `_owner` can deposit in terms of `asset`
*/
function availableDepositLimit(
address /*_owner*/
) public view override returns (uint256) {
// Get the data configuration bitmap.
uint256 _data = lendingPool
.getReserveData(address(asset))
.configuration
.data;
// Cannot deposit when paused or frozen.
if (_isPaused(_data) || _isFrozen(_data)) return 0;
uint256 supplyCap = _getSupplyCap(_data);
// If we have no supply cap.
if (supplyCap == 0) return type(uint256).max;
// Supply plus any already idle funds.
uint256 supply = aToken.totalSupply() + asset.balanceOf(address(this));
// If we already hit the cap.
if (supplyCap <= supply) return 0;
// Return the remaining room.
unchecked {
return supplyCap - supply;
}
}
/**
* @notice Gets the supply cap of the reserve
* @return The supply cap
*/
function getSupplyCap() public view returns (uint256) {
_getSupplyCap(
lendingPool.getReserveData(address(asset)).configuration.data
);
}
/**
* @dev Given the data configuration returns the supply cap.
*/
function _getSupplyCap(uint256 _data) internal view returns (uint256) {
// Get out the supply cap for the asset.
uint256 cap = (_data & ~SUPPLY_CAP_MASK) >>
SUPPLY_CAP_START_BIT_POSITION;
// Adjust to the correct decimals.
return cap * (10 ** decimals);
}
/**
* @dev Paused flag is at the 60th bit
*/
function _isPaused(uint256 _data) internal view returns (bool) {
// Create a mask with only the 60th bit set
uint256 mask = 1 << 60; // Bitwise left shift by 59 positions
// Perform bitwise AND operation to check if the 60th bit is 0.
return (_data & mask) != 0;
}
/**
* @dev Frozen flag is at the 57th bit.
*/
function _isFrozen(uint256 _data) internal view returns (bool) {
// Create a mask with only the 57th bit set
uint256 mask = 1 << 57; // Bitwise left shift by 56 positions
// Perform bitwise AND operation to check if the 57th bit 0.
return (_data & mask) != 0;
}
/**
* @notice Gets the max amount of `asset` that can be withdrawn.
* @dev Defaults to an unlimited amount for any address. But can
* be overridden by strategists.
*
* This function will be called before any withdraw or redeem to enforce
* any limits desired by the strategist. This can be used for illiquid
* or sandwichable strategies. It should never be lower than `totalIdle`.
*
* EX:
* return TokenIzedStrategy.totalIdle();
*
* This does not need to take into account the `_owner`'s share balance
* or conversion rates from shares to assets.
*
* @param . The address that is withdrawing from the strategy.
* @return . The available amount that can be withdrawn in terms of `asset`
*/
function availableWithdrawLimit(
address /*_owner*/
) public view override returns (uint256) {
uint256 liquidity = asset.balanceOf(address(aToken));
// Cannot withdraw from the pool when paused.
if (
_isPaused(
lendingPool.getReserveData(address(asset)).configuration.data
)
) liquidity = 0;
return balanceOfAsset() + liquidity;
}
/**
* @notice Set the `minAmountToSellMapping` for a specific `_token`.
* @dev This can be used by management to adjust wether or not the
* _claimAndSellRewards() function will attempt to sell a specific
* reward token. This can be used if liquidity is to low, amounts
* are to low or any other reason that may cause reverts.
*
* @param _token The address of the token to adjust.
* @param _amount Min required amount to sell.
*/
function setMinAmountToSellMapping(
address _token,
uint256 _amount
) external onlyManagement {
minAmountToSellMapping[_token] = _amount;
}
/**
* @notice Set wether or not the strategy should claim and sell rewards.
* @param _bool Wether or not rewards should be claimed and sold
*/
function setClaimRewards(bool _bool) external onlyManagement {
claimRewards = _bool;
}
///////////// DUTCH AUCTION FUNCTIONS \\\\\\\\\\\\\\\\\\
function setAuction(address _auction) external onlyEmergencyAuthorized {
if (_auction != address(0)) {
require(Auction(_auction).want() == address(asset), "wrong want");
}
auction = _auction;
}
function _auctionKicked(
address _token
) internal virtual override returns (uint256 _kicked) {
require(_token != address(asset), "asset");
_kicked = super._auctionKicked(_token);
require(_kicked >= minAmountToSellMapping[_token], "too little");
}
/**
* @notice Set if tokens should be sold through the dutch auction contract.
*/
function setUseAuction(bool _useAuction) external onlyManagement {
useAuction = _useAuction;
}
/**
* @dev Optional function for a strategist to override that will
* allow management to manually withdraw deployed funds from the
* yield source if a strategy is shutdown.
*
* This should attempt to free `_amount`, noting that `_amount` may
* be more than is currently deployed.
*
* NOTE: This will not realize any profits or losses. A separate
* {report} will be needed in order to record any profit/loss. If
* a report may need to be called after a shutdown it is important
* to check if the strategy is shutdown during {_harvestAndReport}
* so that it does not simply re-deploy all funds that had been freed.
*
* EX:
* if(freeAsset > 0 && !TokenizedStrategy.isShutdown()) {
* depositFunds...
* }
*
* @param _amount The amount of asset to attempt to free.
*/
function _emergencyWithdraw(uint256 _amount) internal override {
_freeFunds(_amount);
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IAToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"auction","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"auctionFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"auctionKicked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"availableDepositLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"availableWithdrawLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"balanceOfAsset","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"base","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkCooldown","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimRewards","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"deployFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"freeFunds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getSupplyCap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"harvestAndReport","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"}],"name":"kickable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lendingPool","outputs":[{"internalType":"contract IPool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"manualRedeemAave","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minAmountToSell","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"minAmountToSellMapping","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amountTaken","type":"uint256"},{"internalType":"uint256","name":"_amountPayed","type":"uint256"}],"name":"postTake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amountToTake","type":"uint256"},{"internalType":"uint256","name":"_amountToPay","type":"uint256"}],"name":"preTake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardsController","outputs":[{"internalType":"contract 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Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb4800000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000013416176652056332055534443204c656e64657200000000000000000000000000
-----Decoded View---------------
Arg [0] : _asset (address): 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Arg [1] : _name (string): Aave V3 USDC Lender
-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000013
Arg [3] : 416176652056332055534443204c656e64657200000000000000000000000000
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://cf9a199e271ae7235e77bab8086a3cd7b81b21e4e8ad2f31592463479d08e906
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