Defi Lending Concepts

etokenMintTransfer.sol

pragma solidity ^0.8.13;

function computeExchangeRate(AssetCache memory assetCache) private pure returns (uint) {
    uint totalAssets = assetCache.poolSize + (assetCache.totalBorrows / INTERNAL_DEBT_PRECISION);
    if (totalAssets == 0 || assetCache.totalBalances == 0) return 1e18;
    return totalAssets * 1e18 / assetCache.totalBalances;
}

function underlyingAmountToBalance(AssetCache memory assetCache, uint amount) internal pure returns (uint) {
    uint exchangeRate = computeExchangeRate(assetCache);
    return amount * 1e18 / exchangeRate;
}