aave-protocol-v2/contracts/libraries/ReserveConfiguration.sol

255 lines
7.6 KiB
Solidity

// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.8;
import {SafeMath} from '@openzeppelin/contracts/math/SafeMath.sol';
import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import {ReserveLogic} from './ReserveLogic.sol';
import {UserLogic} from './UserLogic.sol';
import {WadRayMath} from './WadRayMath.sol';
import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol';
import {IFeeProvider} from '../interfaces/IFeeProvider.sol';
/**
* @title ReserveConfiguration library
* @author Aave
* @notice Implements the bitmap logic to handle the reserve configuration
*/
library ReserveConfiguration {
uint256 constant LTV_MASK = 0xFFFFFFFFFFF0000;
uint256 constant LIQUIDATION_THRESHOLD_MASK = 0xFFFFFFF0000FFFF;
uint256 constant LIQUIDATION_BONUS_MASK = 0xFFF0000FFFFFFFF;
uint256 constant DECIMALS_MASK = 0xF00FFFFFFFFFFFF;
uint256 constant ACTIVE_MASK = 0xEFFFFFFFFFFFFFF;
uint256 constant FROZEN_MASK = 0xDFFFFFFFFFFFFFF;
uint256 constant BORROWING_MASK = 0xBFFFFFFFFFFFFFF;
uint256 constant STABLE_BORROWING_MASK = 0x7FFFFFFFFFFFFFF;
struct Map {
//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 freezed
//bit 58: borrowing is enabled
//bit 59: stable rate borrowing enabled
uint256 data;
}
/**
* @dev sets the Loan to Value of the reserve
* @param _self the reserve configuration
* @param _ltv the new ltv
**/
function setLtv(ReserveConfiguration.Map memory _self, uint256 _ltv) internal {
_self.data = (_self.data & LTV_MASK) | _ltv;
}
/**
* @dev gets the Loan to Value of the reserve
* @param _self the reserve configuration
* @return the loan to value
**/
function getLtv(ReserveConfiguration.Map storage _self) internal view returns (uint256) {
return _self.data & ~LTV_MASK;
}
/**
* @dev sets the liquidation threshold of the reserve
* @param _self the reserve configuration
* @param _threshold the new liquidation threshold
**/
function setLiquidationThreshold(ReserveConfiguration.Map memory _self, uint256 _threshold)
internal
{
_self.data = (_self.data & LIQUIDATION_THRESHOLD_MASK) | (_threshold << 16);
}
/**
* @dev gets the Loan to Value of the reserve
* @param _self the reserve configuration
* @return the liquidation threshold
**/
function getLiquidationThreshold(ReserveConfiguration.Map storage _self)
internal
view
returns (uint256)
{
return (_self.data & ~LIQUIDATION_THRESHOLD_MASK) >> 16;
}
/**
* @dev sets the liquidation bonus of the reserve
* @param _self the reserve configuration
* @param _bonus the new liquidation bonus
**/
function setLiquidationBonus(ReserveConfiguration.Map memory _self, uint256 _bonus) internal {
_self.data = (_self.data & LIQUIDATION_BONUS_MASK) | (_bonus << 32);
}
/**
* @dev gets the liquidation bonus of the reserve
* @param _self the reserve configuration
* @return the liquidation bonus
**/
function getLiquidationBonus(ReserveConfiguration.Map storage _self)
internal
view
returns (uint256)
{
return (_self.data & ~LIQUIDATION_BONUS_MASK) >> 32;
}
/**
* @dev sets the decimals of the underlying asset of the reserve
* @param _self the reserve configuration
* @param _decimals the decimals
**/
function setDecimals(ReserveConfiguration.Map memory _self, uint256 _decimals) internal {
_self.data = (_self.data & DECIMALS_MASK) | (_decimals << 48);
}
/**
* @dev gets the decimals of the underlying asset of the reserve
* @param _self the reserve configuration
* @return the decimals of the asset
**/
function getDecimals(ReserveConfiguration.Map storage _self) internal view returns (uint256) {
return (_self.data & ~DECIMALS_MASK) >> 48;
}
/**
* @dev sets the active state of the reserve
* @param _self the reserve configuration
* @param _active the active state
**/
function setActive(ReserveConfiguration.Map memory _self, bool _active) internal {
_self.data = (_self.data & ACTIVE_MASK) | (uint256(_active ? 1 : 0) << 56);
}
/**
* @dev gets the active state of the reserve
* @param _self the reserve configuration
* @return the active state
**/
function getActive(ReserveConfiguration.Map storage _self) internal view returns (bool) {
return ((_self.data & ~ACTIVE_MASK) >> 56) != 0;
}
/**
* @dev sets the frozen state of the reserve
* @param _self the reserve configuration
* @param _frozen the frozen state
**/
function setFrozen(ReserveConfiguration.Map memory _self, bool _frozen) internal {
_self.data = (_self.data & FROZEN_MASK) | (uint256(_frozen ? 1 : 0) << 57);
}
/**
* @dev gets the frozen state of the reserve
* @param _self the reserve configuration
* @return the frozen state
**/
function getFrozen(ReserveConfiguration.Map storage _self) internal view returns (bool) {
return ((_self.data & ~FROZEN_MASK) >> 57) != 0;
}
/**
* @dev enables or disables borrowing on the reserve
* @param _self the reserve configuration
* @param _enabled true if the borrowing needs to be enabled, false otherwise
**/
function setBorrowingEnabled(ReserveConfiguration.Map memory _self, bool _enabled) internal {
_self.data = (_self.data & BORROWING_MASK) | (uint256(_enabled ? 1 : 0) << 58);
}
/**
* @dev gets the borrowing state of the reserve
* @param _self the reserve configuration
* @return the borrowing state
**/
function getBorrowingEnabled(ReserveConfiguration.Map storage _self)
internal
view
returns (bool)
{
return ((_self.data & ~BORROWING_MASK) >> 58) != 0;
}
/**
* @dev enables or disables stable rate borrowing on the reserve
* @param _self the reserve configuration
* @param _enabled true if the stable rate borrowing needs to be enabled, false otherwise
**/
function setStableRateBorrowingEnabled(ReserveConfiguration.Map memory _self, bool _enabled)
internal
{
_self.data = (_self.data & STABLE_BORROWING_MASK) | (uint256(_enabled ? 1 : 0) << 59);
}
/**
* @dev gets the stable rate borrowing state of the reserve
* @param _self the reserve configuration
* @return the stable rate borrowing state
**/
function getStableRateBorrowingEnabled(ReserveConfiguration.Map storage _self)
internal
view
returns (bool)
{
return ((_self.data & ~STABLE_BORROWING_MASK) >> 59) != 0;
}
/**
* @dev gets the configuration flags of the reserve
* @param _self the reserve configuration
* @return the state flags representing active, freezed, borrowing enabled, stableRateBorrowing enabled
**/
function getFlags(ReserveConfiguration.Map storage _self)
internal
view
returns (
bool,
bool,
bool,
bool
)
{
uint256 dataLocal = _self.data;
return (
(dataLocal & ~ACTIVE_MASK) >> 56 != 0,
(dataLocal & ~FROZEN_MASK) >> 57 != 0,
(dataLocal & ~BORROWING_MASK) >> 58 != 0,
(dataLocal & ~STABLE_BORROWING_MASK) >> 59 != 0
);
}
/**
* @dev gets the configuration paramters of the reserve
* @param _self the reserve configuration
* @return the state params representing ltv, liquidation threshold, liquidation bonus, the reserve decimals
**/
function getParams(ReserveConfiguration.Map storage _self)
internal
view
returns (
uint256,
uint256,
uint256,
uint256
)
{
uint256 dataLocal = _self.data;
return (
dataLocal & ~LTV_MASK,
(dataLocal & ~LIQUIDATION_THRESHOLD_MASK) >> 16,
(dataLocal & ~LIQUIDATION_BONUS_MASK) >> 32,
(dataLocal & ~DECIMALS_MASK) >> 48
);
}
}