Contract Name:
ChainlinkFeedGetter
Contract Source Code:
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;
import "../oracle/interfaces/IPrimeOracle.sol";
import "../oracle/interfaces/IPrimeOracleGetter.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorInterface.sol";
contract ChainlinkFeedGetter is IPrimeOracleGetter {
// Map of asset price feeds (asset => priceSource)
mapping(IERC20 => AggregatorInterface) private assetFeeds;
address public immutable denomCurrency;
uint256 public immutable denomCurrencyUnit;
//TODO: allow transfer of ownership
address public admin;
/**
* @dev Only the admin can call functions marked by this modifier.
**/
modifier onlyAdmin {
require(msg.sender == admin, "Unauthorized use of function");
_;
}
/// @notice constructor
/// @param assets list of addresses of the assets
/// @param feeds The address of the feed of each asset
/// @param _denomCurrency the denom currency used for the price quotes. If USD is used, denom currency is 0x0
/// @param _denomCurrencyUnit the unit of the denom currency
constructor(
IERC20[] memory assets,
address[] memory feeds,
address _denomCurrency,
uint256 _denomCurrencyUnit
) {
require(_denomCurrency != address(0), "NON_ZEROADDRESS");
admin = msg.sender;
_setAssetFeeds(assets, feeds);
denomCurrency = _denomCurrency;
denomCurrencyUnit = _denomCurrencyUnit;
emit DenomCurrencySet(_denomCurrency, _denomCurrencyUnit);
}
/// @inheritdoc IPrimeOracleGetter
function getAssetPrice(IERC20 quoteToken, IERC20 denomToken) external view override returns (uint256) {
IERC20 asset = quoteToken;
AggregatorInterface feed = assetFeeds[asset];
if (address(feed) != address(0)) {
//8 decimal prsecision for USD prices
int256 price = feed.latestAnswer();
return uint256(price);
}
return 0;
}
function _getAssetFeed(IERC20 asset) internal view returns (address){
return address(assetFeeds[asset]);
}
function getAssetFeed(IERC20 asset) external view override returns (address)
{
return _getAssetFeed(asset);
}
/// @inheritdoc IPrimeOracleGetter
function setAssetFeeds(IERC20[] calldata assets, address[] calldata feeds)
external
override
onlyAdmin
{
_setAssetFeeds(assets, feeds);
}
/**
* @notice Internal function to set the feeds for each asset
* @param assets The addresses of the assets
* @param feeds The address of the feed of each asset
*/
function _setAssetFeeds(IERC20[] memory assets, address[] memory feeds) internal {
require(assets.length == feeds.length, "ERROR: Length mismatch between 'assets' and 'feeds'");
// slither-disable-next-line uninitialized-local
for (uint256 i; i < assets.length; i++) {
assetFeeds[assets[i]] = AggregatorInterface(feeds[i]);
emit AssetFeedUpdated(assets[i], feeds[i]);
}
}
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;
import "./IPrimeOracleGetter.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
/**
* @title IPrimeOracle
* @author Prime
* @notice The core interface for the Prime Oracle
*/
interface IPrimeOracle {
/**
* @dev Emitted after the price data feed of an asset is updated
* @param asset The address of the asset
* @param feed The price feed of the asset
*/
event PrimaryFeedUpdated(IERC20 indexed asset, address indexed feed);
/**
* @dev Emitted after the price data feed of an asset is updated
* @param asset The address of the asset
* @param feed The price feed of the asset
*/
event SecondaryFeedUpdated(IERC20 indexed asset, address indexed feed);
/**
* @notice Sets or replaces price feeds of assets
* @param assets The addresses of the assets
* @param feeds The addresses of the price feeds
*/
function setPrimaryFeeds(IERC20[] calldata assets, IPrimeOracleGetter[] calldata feeds) external;
/**
* @notice Sets or replaces price feeds of assets
* @param assets The addresses of the assets
* @param feeds The addresses of the price feeds
*/
function setSecondaryFeeds(IERC20[] calldata assets, IPrimeOracleGetter[] calldata feeds) external;
/**
* @notice Returns a list of prices from a list of assets addresses
* @param assets The list of assets addresses
* @return The prices of the given assets
*/
function getAssetPrices(IERC20[] calldata assets) external view returns (uint256[] memory);
/**
* @notice Returns the address of the primary price feed for an asset address
* @param asset The address of the asset
* @return The address of the price feed
*/
function getPrimaryFeedOfAsset(IERC20 asset) external view returns (address);
/**
* @notice Returns the address of the secondary price feed for an asset address
* @param asset The address of the asset
* @return The address of the price feed
*/
function getSecondaryFeedOfAsset(IERC20 asset) external view returns (address);
/**
* @notice Returns the address for the denomination currency
* @dev For USD, the address should be set to 0x0.
* @return Returns the denomination currency address.
**/
function getDenomCurrency() external view returns (address);
/**
* @notice Returns the denom currency unit
* @dev 1e8 for USD, 1 ether for ETH.
* @return Returns the denom currency unit.
**/
function getDenomCurrencyUnit() external view returns (uint256);
/**
* @return Returns the price of PUSD
**/
function getPusdPrice() external view returns (uint256);
}
//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
/**
* @title IPrimeOracleGetter
* @author Prime
* @notice Interface for the Prime price oracle.
**/
interface IPrimeOracleGetter {
/**
* @dev Emitted after the denom currency is set
* @param denomCurrency The denom currency used for price quotes
* @param denomCurrencyUnit The unit of the denom currency (1e8 for USD)
*/
event DenomCurrencySet(address indexed denomCurrency, uint256 denomCurrencyUnit);
/**
* @dev Emitted after the price data feed of an asset is updated
* @param asset The address of the asset
* @param feed The price feed of the asset
*/
event AssetFeedUpdated(IERC20 indexed asset, address indexed feed);
/**
* @notice Gets the price feed of an asset
* @param asset The addresses of the asset
* @return address of asset feed
*/
function getAssetFeed(IERC20 asset) external view returns (address);
/**
* @notice Sets or replaces price feeds of assets
* @param assets The addresses of the assets
* @param feeds The addresses of the price feeds
*/
function setAssetFeeds(IERC20[] calldata assets, address[] calldata feeds) external;
/**
* @notice Returns the price data in the denom currency
* @param quoteToken A token to return price data for
* @param denomToken A token to price quoteToken against
* @return return price of the asset from the oracle
**/
function getAssetPrice(IERC20 quoteToken, IERC20 denomToken) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
interface AggregatorInterface {
function latestAnswer() external view returns (int256);
function latestTimestamp() external view returns (uint256);
function latestRound() external view returns (uint256);
function getAnswer(uint256 roundId) external view returns (int256);
function getTimestamp(uint256 roundId) external view returns (uint256);
event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);
event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/ERC20.sol)
pragma solidity ^0.8.0;
import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin 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}.
*
* The default value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* 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 value {ERC20} uses, unless this function is
* 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 `sender` to `recipient`.
*
* 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;
}
_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;
_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;
}
_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 {}
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @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);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC20 standard.
*
* _Available since v4.1._
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}