Defi Lending Concepts 1

etoken.sol

pragma solidity ^0.8.13;

function deposit(uint subAccountId, uint amount) external nonReentrant {
    (address underlying, AssetStorage storage assetStorage, address proxyAddr, address msgSender) = CALLER();
    address account = getSubAccount(msgSender, subAccountId);

    updateAverageLiquidity(account);
    emit RequestDeposit(account, amount);

    AssetCache memory assetCache = loadAssetCache(underlying, assetStorage);

    if (amount == type(uint).max) {
        amount = callBalanceOf(assetCache, msgSender);
    }

    amount = decodeExternalAmount(assetCache, amount);

    uint amountTransferred = pullTokens(assetCache, msgSender, amount);
    uint amountInternal;

    unchecked {
        assetCache.poolSize -= amountTransferred;
        amountInternal = underlyingAmountToBalance(assetCache, amountTransferred);
        assetCache.poolSize += amountTransferred;
    }

    increaseBalance(assetStorage, assetCache, proxyAddr, account, amountInternal);

    if (assetStorage.users[account].owed != 0) checkLiquidity(account);

    logAssetStatus(assetCache);
}