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Overview
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| Parent Transaction Hash | Block | From | To | |||
|---|---|---|---|---|---|---|
| 19388939 | 245 days ago | Contract Creation | 0 ETH |
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0xbDb97eC3...83dFC7BE4 The constructor portion of the code might be different and could alter the actual behaviour of the contract
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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Swarm Source
ipfs://cf9a199e271ae7235e77bab8086a3cd7b81b21e4e8ad2f31592463479d08e906
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
|---|---|---|---|---|---|
| ETH | 100.00% | $1 | 1,709.0788 | $1,709.08 |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.