0g-chain/x/harvest/keeper/borrow.go

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package keeper
import (
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/kava-labs/kava/x/harvest/types"
)
// Borrow funds
func (k Keeper) Borrow(ctx sdk.Context, borrower sdk.AccAddress, coins sdk.Coins) error {
err := k.ValidateBorrow(ctx, borrower, coins)
if err != nil {
return err
}
err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleAccountName, borrower, coins)
if err != nil {
if strings.Contains(err.Error(), "insufficient account funds") {
modAccCoins := k.supplyKeeper.GetModuleAccount(ctx, types.ModuleAccountName).GetCoins()
for _, coin := range coins {
_, isNegative := modAccCoins.SafeSub(sdk.NewCoins(coin))
if isNegative {
return sdkerrors.Wrapf(types.ErrBorrowExceedsAvailableBalance,
"the requested borrow amount of %s exceeds the total amount of %s%s available to borrow",
coin, modAccCoins.AmountOf(coin.Denom), coin.Denom,
)
}
}
}
}
borrow, found := k.GetBorrow(ctx, borrower)
if !found {
borrow = types.NewBorrow(borrower, coins)
} else {
borrow.Amount = borrow.Amount.Add(coins...)
}
k.SetBorrow(ctx, borrow)
ctx.EventManager().EmitEvent(
sdk.NewEvent(
types.EventTypeHarvestBorrow,
sdk.NewAttribute(types.AttributeKeyBorrower, borrow.Borrower.String()),
sdk.NewAttribute(types.AttributeKeyBorrowCoins, coins.String()),
),
)
return nil
}
// ValidateBorrow validates a borrow request against borrower and protocol requirements
func (k Keeper) ValidateBorrow(ctx sdk.Context, borrower sdk.AccAddress, amount sdk.Coins) error {
// Get the proposed borrow USD value
moneyMarketCache := map[string]types.MoneyMarket{}
proprosedBorrowUSDValue := sdk.ZeroDec()
for _, coin := range amount {
moneyMarket, ok := moneyMarketCache[coin.Denom]
// Fetch money market and store in local cache
if !ok {
newMoneyMarket, found := k.GetMoneyMarket(ctx, coin.Denom)
if !found {
return sdkerrors.Wrapf(types.ErrMarketNotFound, "no market found for denom %s", coin.Denom)
}
moneyMarketCache[coin.Denom] = newMoneyMarket
moneyMarket = newMoneyMarket
}
// Calculate this coin's USD value and add it borrow's total USD value
assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
if err != nil {
return sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
}
coinUSDValue := sdk.NewDecFromInt(coin.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
proprosedBorrowUSDValue = proprosedBorrowUSDValue.Add(coinUSDValue)
}
// Get the total borrowable USD amount at user's existing deposits
deposits := k.GetDepositsByUser(ctx, borrower)
if len(deposits) == 0 {
return sdkerrors.Wrapf(types.ErrDepositsNotFound, "no deposits found for %s", borrower)
}
totalBorrowableAmount := sdk.ZeroDec()
for _, deposit := range deposits {
moneyMarket, ok := moneyMarketCache[deposit.Amount.Denom]
// Fetch money market and store in local cache
if !ok {
newMoneyMarket, found := k.GetMoneyMarket(ctx, deposit.Amount.Denom)
if !found {
return sdkerrors.Wrapf(types.ErrMarketNotFound, "no market found for denom %s", deposit.Amount.Denom)
}
moneyMarketCache[deposit.Amount.Denom] = newMoneyMarket
moneyMarket = newMoneyMarket
}
// Calculate the borrowable amount and add it to the user's total borrowable amount
assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
if err != nil {
sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
}
depositUSDValue := sdk.NewDecFromInt(deposit.Amount.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
borrowableAmountForDeposit := depositUSDValue.Mul(moneyMarket.BorrowLimit.LoanToValue)
totalBorrowableAmount = totalBorrowableAmount.Add(borrowableAmountForDeposit)
}
// Get the total USD value of user's existing borrows
existingBorrowUSDValue := sdk.ZeroDec()
existingBorrow, found := k.GetBorrow(ctx, borrower)
if found {
for _, borrowedCoin := range existingBorrow.Amount {
moneyMarket, ok := moneyMarketCache[borrowedCoin.Denom]
// Fetch money market and store in local cache
if !ok {
newMoneyMarket, found := k.GetMoneyMarket(ctx, borrowedCoin.Denom)
if !found {
return sdkerrors.Wrapf(types.ErrMarketNotFound, "no market found for denom %s", borrowedCoin.Denom)
}
moneyMarketCache[borrowedCoin.Denom] = newMoneyMarket
moneyMarket = newMoneyMarket
}
// Calculate this borrow coin's USD value and add it to the total previous borrowed USD value
assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
if err != nil {
return sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
}
coinUSDValue := sdk.NewDecFromInt(borrowedCoin.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
existingBorrowUSDValue = existingBorrowUSDValue.Add(coinUSDValue)
}
}
// Validate that the proposed borrow's USD value is within user's borrowable limit
if proprosedBorrowUSDValue.GT(totalBorrowableAmount.Sub(existingBorrowUSDValue)) {
return sdkerrors.Wrapf(types.ErrInsufficientLoanToValue, "requested borrow %s is greater than maximum valid borrow", amount)
}
return nil
}