mirror of
https://github.com/Instadapp/fluid-contracts-public.git
synced 2024-07-29 21:57:37 +00:00
57 lines
2.4 KiB
Solidity
57 lines
2.4 KiB
Solidity
// SPDX-License-Identifier: BUSL-1.1
|
|
pragma solidity 0.8.21;
|
|
|
|
import { IERC4626 } from "@openzeppelin/contracts/interfaces/IERC4626.sol";
|
|
|
|
import { ErrorTypes } from "../errorTypes.sol";
|
|
import { Error as OracleError } from "../error.sol";
|
|
import { OracleUtils } from "../libraries/oracleUtils.sol";
|
|
|
|
/// @title sUSDe Oracle Implementation
|
|
/// @notice This contract is used to get the exchange rate between sUSDe and USDe, adjusted for token decimals
|
|
/// of a debt token (e.g. USDC / USDT)
|
|
abstract contract SUSDeOracleImpl is OracleError {
|
|
/// @notice constant value for price scaling to reduce gas usage
|
|
uint256 internal immutable _SUSDE_PRICE_SCALER_MULTIPLIER;
|
|
|
|
/// @notice SUSDE contract, e.g. on mainnet 0x9d39a5de30e57443bff2a8307a4256c8797a3497
|
|
IERC4626 internal immutable _SUSDE;
|
|
|
|
uint8 internal immutable _DEBT_TOKEN_DECIMALS;
|
|
|
|
/// @notice constructor sets the sUSDe `sUSDe_` token address.
|
|
constructor(IERC4626 sUSDe_, uint8 debtTokenDecimals_) {
|
|
if (address(sUSDe_) == address(0) || debtTokenDecimals_ < 6) {
|
|
revert FluidOracleError(ErrorTypes.SUSDeOracle__InvalidParams);
|
|
}
|
|
|
|
_SUSDE = sUSDe_;
|
|
|
|
// debt token decimals is used to make sure the returned exchange rate is scaled correctly e.g.
|
|
// for an exchange rate between sUSDe and USDC (this Oracle returning amount of USDC for 1e18 sUSDe).
|
|
_DEBT_TOKEN_DECIMALS = debtTokenDecimals_;
|
|
|
|
_SUSDE_PRICE_SCALER_MULTIPLIER = 10 ** (debtTokenDecimals_ - 6);
|
|
// e.g. when:
|
|
// - debtTokenDecimals_ = 6 -> scaler multiplier is 1
|
|
// - debtTokenDecimals_ = 7 -> scaler multiplier is 10
|
|
// - debtTokenDecimals_ = 18 -> scaler multiplier is 1e12
|
|
// -> gets 1e15 returned exchange rate to 1e27
|
|
}
|
|
|
|
/// @notice Get the exchange rate from sUSDe contract (amount of USDe for 1 sUSDe)
|
|
/// @return rate_ The exchange rate in `OracleUtils.RATE_OUTPUT_DECIMALS`
|
|
function _getSUSDeExchangeRate() internal view returns (uint256 rate_) {
|
|
return _SUSDE.convertToAssets(1e15) * _SUSDE_PRICE_SCALER_MULTIPLIER;
|
|
}
|
|
|
|
/// @notice returns all sUSDe oracle related data as utility for easy off-chain use / block explorer in a single view method
|
|
function sUSDeOracleData()
|
|
public
|
|
view
|
|
returns (uint256 sUSDeExchangeRate_, IERC4626 sUSDe_, uint256 debtTokenDecimals_)
|
|
{
|
|
return (_getSUSDeExchangeRate(), _SUSDE, _DEBT_TOKEN_DECIMALS);
|
|
}
|
|
}
|