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comments: added comments to cache() and refreshDebt()

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This commit is contained in:
emilio 2021-06-11 17:03:52 +02:00
parent 8451c88174
commit 065799eb29
1 changed files with 17 additions and 0 deletions
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17
contracts/protocol/libraries/logic/ReserveLogic.sol
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@ -340,6 +340,12 @@ library ReserveLogic {
reserve.lastUpdateTimestamp = uint40(block.timestamp); reserve.lastUpdateTimestamp = uint40(block.timestamp);
} }
/**
* @dev Creates a cache object to avoid repeated storage reads and external contract calls
* when updating state and interest rates.
* @param reserve The reserve object for which the cache will be filled
* @return The cache object
*/
function cache(DataTypes.ReserveData storage reserve) function cache(DataTypes.ReserveData storage reserve)
internal internal
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@ -372,6 +378,8 @@ library ReserveLogic {
reserveCache.stableDebtLastUpdateTimestamp reserveCache.stableDebtLastUpdateTimestamp
) = IStableDebtToken(reserveCache.stableDebtTokenAddress).getSupplyData(); ) = IStableDebtToken(reserveCache.stableDebtTokenAddress).getSupplyData();
// setting by default the debt data after the action with the same values as before
// if the action involves mint/burn of debt, the cache is updated through refreshDebt()
reserveCache.nextPrincipalStableDebt = reserveCache.currPrincipalStableDebt; reserveCache.nextPrincipalStableDebt = reserveCache.currPrincipalStableDebt;
reserveCache.nextTotalStableDebt = reserveCache.currTotalStableDebt; reserveCache.nextTotalStableDebt = reserveCache.currTotalStableDebt;
reserveCache.nextAvgStableBorrowRate = reserveCache.currAvgStableBorrowRate; reserveCache.nextAvgStableBorrowRate = reserveCache.currAvgStableBorrowRate;
@ -379,6 +387,15 @@ library ReserveLogic {
return reserveCache; return reserveCache;
} }
/**
* @dev Updates the debt data in the cache object. Invoked after an interaction caused minting/burning of the debt.
* MUST be invoked before updateInterestRates().
* @param cache The cache object
* @param stableDebtMinted The stable debt minted as a consequence of the interaction
* @param stableDebtBurned The stable debt burned as a consequence of the interaction
* @param variableDebtMinted The variable debt minted as a consequence of the interaction
* @param variableDebtBurned The variable debt burned as a consequence of the interaction
*/
function refreshDebt( function refreshDebt(
DataTypes.ReserveCache memory cache, DataTypes.ReserveCache memory cache,
uint256 stableDebtMinted, uint256 stableDebtMinted,