mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-11-14 12:05:18 +00:00
299 lines
11 KiB
Go
299 lines
11 KiB
Go
package keeper
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import (
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"errors"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/kava-labs/kava/x/hard/types"
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)
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// Borrow funds
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func (k Keeper) Borrow(ctx sdk.Context, borrower sdk.AccAddress, coins sdk.Coins) error {
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// Set any new denoms' global borrow index to 1.0
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for _, coin := range coins {
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_, foundInterestFactor := k.GetBorrowInterestFactor(ctx, coin.Denom)
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if !foundInterestFactor {
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_, foundMm := k.GetMoneyMarket(ctx, coin.Denom)
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if foundMm {
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k.SetBorrowInterestFactor(ctx, coin.Denom, sdk.OneDec())
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}
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}
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}
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// Call incentive hooks
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existingDeposit, hasExistingDeposit := k.GetDeposit(ctx, borrower)
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if hasExistingDeposit {
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k.BeforeDepositModified(ctx, existingDeposit)
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}
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existingBorrow, hasExistingBorrow := k.GetBorrow(ctx, borrower)
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if hasExistingBorrow {
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k.BeforeBorrowModified(ctx, existingBorrow)
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}
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k.SyncSupplyInterest(ctx, borrower)
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k.SyncBorrowInterest(ctx, borrower)
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// Validate borrow amount within user and protocol limits
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err := k.ValidateBorrow(ctx, borrower, coins)
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if err != nil {
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return err
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}
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// Sends coins from Hard module account to user
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err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleAccountName, borrower, coins)
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if err != nil {
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if errors.Is(err, sdkerrors.ErrInsufficientFunds) {
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modAccCoins := k.supplyKeeper.GetModuleAccount(ctx, types.ModuleAccountName).GetCoins()
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for _, coin := range coins {
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_, isNegative := modAccCoins.SafeSub(sdk.NewCoins(coin))
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if isNegative {
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return sdkerrors.Wrapf(types.ErrBorrowExceedsAvailableBalance,
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"the requested borrow amount of %s exceeds the total amount of %s%s available to borrow",
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coin, modAccCoins.AmountOf(coin.Denom), coin.Denom,
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)
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}
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}
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}
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return err
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}
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interestFactors := types.BorrowInterestFactors{}
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currBorrow, foundBorrow := k.GetBorrow(ctx, borrower)
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if foundBorrow {
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interestFactors = currBorrow.Index
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}
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for _, coin := range coins {
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interestFactorValue, foundValue := k.GetBorrowInterestFactor(ctx, coin.Denom)
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if foundValue {
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interestFactors = interestFactors.SetInterestFactor(coin.Denom, interestFactorValue)
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}
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}
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// Calculate new borrow amount
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var amount sdk.Coins
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if foundBorrow {
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amount = currBorrow.Amount.Add(coins...)
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} else {
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amount = coins
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}
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// Construct the user's new/updated borrow with amount and interest factors
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borrow := types.NewBorrow(borrower, amount, interestFactors)
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if borrow.Amount.Empty() {
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k.DeleteBorrow(ctx, borrow)
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} else {
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k.SetBorrow(ctx, borrow)
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}
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// Update total borrowed amount by newly borrowed coins. Don't add user's pending interest as
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// it has already been included in the total borrowed coins by the BeginBlocker.
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k.IncrementBorrowedCoins(ctx, coins)
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if !hasExistingBorrow {
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k.AfterBorrowCreated(ctx, borrow)
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} else {
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k.AfterBorrowModified(ctx, borrow)
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}
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ctx.EventManager().EmitEvent(
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sdk.NewEvent(
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types.EventTypeHardBorrow,
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sdk.NewAttribute(types.AttributeKeyBorrower, borrower.String()),
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sdk.NewAttribute(types.AttributeKeyBorrowCoins, coins.String()),
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),
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)
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return nil
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}
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// ValidateBorrow validates a borrow request against borrower and protocol requirements
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func (k Keeper) ValidateBorrow(ctx sdk.Context, borrower sdk.AccAddress, amount sdk.Coins) error {
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if amount.IsZero() {
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return types.ErrBorrowEmptyCoins
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}
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// The reserve coins aren't available for users to borrow
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hardMaccCoins := k.supplyKeeper.GetModuleAccount(ctx, types.ModuleName).GetCoins()
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reserveCoins, foundReserveCoins := k.GetTotalReserves(ctx)
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if !foundReserveCoins {
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reserveCoins = sdk.NewCoins()
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}
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fundsAvailableToBorrow, isNegative := hardMaccCoins.SafeSub(reserveCoins)
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if isNegative {
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return sdkerrors.Wrapf(types.ErrReservesExceedCash, "reserves %s > cash %s", reserveCoins, hardMaccCoins)
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}
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if amount.IsAnyGT(fundsAvailableToBorrow) {
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return sdkerrors.Wrapf(types.ErrExceedsProtocolBorrowableBalance, "requested borrow %s > available to borrow %s", amount, fundsAvailableToBorrow)
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}
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// Get the proposed borrow USD value
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proprosedBorrowUSDValue := sdk.ZeroDec()
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for _, coin := range amount {
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moneyMarket, found := k.GetMoneyMarket(ctx, coin.Denom)
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if !found {
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return sdkerrors.Wrapf(types.ErrMarketNotFound, "no money market found for denom %s", coin.Denom)
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}
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// Calculate this coin's USD value and add it borrow's total USD value
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assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
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if err != nil {
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return sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
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}
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coinUSDValue := sdk.NewDecFromInt(coin.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
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// Validate the requested borrow value for the asset against the money market's global borrow limit
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if moneyMarket.BorrowLimit.HasMaxLimit {
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var assetTotalBorrowedAmount sdk.Int
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totalBorrowedCoins, found := k.GetBorrowedCoins(ctx)
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if !found {
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assetTotalBorrowedAmount = sdk.ZeroInt()
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} else {
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assetTotalBorrowedAmount = totalBorrowedCoins.AmountOf(coin.Denom)
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}
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newProposedAssetTotalBorrowedAmount := sdk.NewDecFromInt(assetTotalBorrowedAmount.Add(coin.Amount))
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if newProposedAssetTotalBorrowedAmount.GT(moneyMarket.BorrowLimit.MaximumLimit) {
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return sdkerrors.Wrapf(types.ErrGreaterThanAssetBorrowLimit,
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"proposed borrow would result in %s borrowed, but the maximum global asset borrow limit is %s",
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newProposedAssetTotalBorrowedAmount, moneyMarket.BorrowLimit.MaximumLimit)
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}
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}
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proprosedBorrowUSDValue = proprosedBorrowUSDValue.Add(coinUSDValue)
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}
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// Get the total borrowable USD amount at user's existing deposits
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deposit, found := k.GetDeposit(ctx, borrower)
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if !found {
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return sdkerrors.Wrapf(types.ErrDepositsNotFound, "no deposits found for %s", borrower)
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}
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totalBorrowableAmount := sdk.ZeroDec()
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for _, coin := range deposit.Amount {
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moneyMarket, found := k.GetMoneyMarket(ctx, coin.Denom)
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if !found {
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return sdkerrors.Wrapf(types.ErrMarketNotFound, "no money market found for denom %s", coin.Denom)
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}
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// Calculate the borrowable amount and add it to the user's total borrowable amount
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assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
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if err != nil {
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return sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
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}
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depositUSDValue := sdk.NewDecFromInt(coin.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
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borrowableAmountForDeposit := depositUSDValue.Mul(moneyMarket.BorrowLimit.LoanToValue)
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totalBorrowableAmount = totalBorrowableAmount.Add(borrowableAmountForDeposit)
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}
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// Get the total USD value of user's existing borrows
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existingBorrowUSDValue := sdk.ZeroDec()
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existingBorrow, found := k.GetBorrow(ctx, borrower)
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if found {
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for _, coin := range existingBorrow.Amount {
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moneyMarket, found := k.GetMoneyMarket(ctx, coin.Denom)
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if !found {
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return sdkerrors.Wrapf(types.ErrMarketNotFound, "no money market found for denom %s", coin.Denom)
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}
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// Calculate this borrow coin's USD value and add it to the total previous borrowed USD value
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assetPriceInfo, err := k.pricefeedKeeper.GetCurrentPrice(ctx, moneyMarket.SpotMarketID)
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if err != nil {
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return sdkerrors.Wrapf(types.ErrPriceNotFound, "no price found for market %s", moneyMarket.SpotMarketID)
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}
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coinUSDValue := sdk.NewDecFromInt(coin.Amount).Quo(sdk.NewDecFromInt(moneyMarket.ConversionFactor)).Mul(assetPriceInfo.Price)
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existingBorrowUSDValue = existingBorrowUSDValue.Add(coinUSDValue)
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}
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}
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// Borrow's updated total USD value must be greater than the minimum global USD borrow limit
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totalBorrowUSDValue := proprosedBorrowUSDValue.Add(existingBorrowUSDValue)
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if totalBorrowUSDValue.LT(k.GetMinimumBorrowUSDValue(ctx)) {
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return sdkerrors.Wrapf(types.ErrBelowMinimumBorrowValue, "the proposed borrow's USD value $%s is below the minimum borrow limit $%s", totalBorrowUSDValue, k.GetMinimumBorrowUSDValue(ctx))
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}
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// Validate that the proposed borrow's USD value is within user's borrowable limit
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if proprosedBorrowUSDValue.GT(totalBorrowableAmount.Sub(existingBorrowUSDValue)) {
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return sdkerrors.Wrapf(types.ErrInsufficientLoanToValue, "requested borrow %s exceeds the allowable amount as determined by the collateralization ratio", amount)
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}
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return nil
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}
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// IncrementBorrowedCoins increments the total amount of borrowed coins by the newCoins parameter
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func (k Keeper) IncrementBorrowedCoins(ctx sdk.Context, newCoins sdk.Coins) {
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borrowedCoins, found := k.GetBorrowedCoins(ctx)
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if !found {
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if !newCoins.Empty() {
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k.SetBorrowedCoins(ctx, newCoins)
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}
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} else {
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k.SetBorrowedCoins(ctx, borrowedCoins.Add(newCoins...))
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}
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}
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// DecrementBorrowedCoins decrements the total amount of borrowed coins by the coins parameter
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func (k Keeper) DecrementBorrowedCoins(ctx sdk.Context, coins sdk.Coins) error {
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borrowedCoins, found := k.GetBorrowedCoins(ctx)
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if !found {
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return sdkerrors.Wrapf(types.ErrBorrowedCoinsNotFound, "cannot repay coins if no coins are currently borrowed")
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}
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updatedBorrowedCoins, isNegative := borrowedCoins.SafeSub(coins)
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if isNegative {
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coinsToSubtract := sdk.NewCoins()
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for _, coin := range coins {
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if borrowedCoins.AmountOf(coin.Denom).LT(coin.Amount) {
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if borrowedCoins.AmountOf(coin.Denom).GT(sdk.ZeroInt()) {
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coinsToSubtract = coinsToSubtract.Add(sdk.NewCoin(coin.Denom, borrowedCoins.AmountOf(coin.Denom)))
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}
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} else {
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coinsToSubtract = coinsToSubtract.Add(coin)
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}
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}
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updatedBorrowedCoins = borrowedCoins.Sub(coinsToSubtract)
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}
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k.SetBorrowedCoins(ctx, updatedBorrowedCoins)
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return nil
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}
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// GetSyncedBorrow returns a borrow object containing current balances and indexes
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func (k Keeper) GetSyncedBorrow(ctx sdk.Context, borrower sdk.AccAddress) (types.Borrow, bool) {
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borrow, found := k.GetBorrow(ctx, borrower)
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if !found {
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return types.Borrow{}, false
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}
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return k.loadSyncedBorrow(ctx, borrow), true
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}
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// loadSyncedBorrow calculates a user's synced borrow, but does not update state
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func (k Keeper) loadSyncedBorrow(ctx sdk.Context, borrow types.Borrow) types.Borrow {
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totalNewInterest := sdk.Coins{}
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newBorrowIndexes := types.BorrowInterestFactors{}
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for _, coin := range borrow.Amount {
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interestFactorValue, foundInterestFactorValue := k.GetBorrowInterestFactor(ctx, coin.Denom)
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if foundInterestFactorValue {
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// Locate the interest factor by coin denom in the user's list of interest factors
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foundAtIndex := -1
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for i := range borrow.Index {
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if borrow.Index[i].Denom == coin.Denom {
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foundAtIndex = i
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break
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}
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}
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// Calculate interest owed by user for this asset
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if foundAtIndex != -1 {
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storedAmount := sdk.NewDecFromInt(borrow.Amount.AmountOf(coin.Denom))
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userLastInterestFactor := borrow.Index[foundAtIndex].Value
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coinInterest := (storedAmount.Quo(userLastInterestFactor).Mul(interestFactorValue)).Sub(storedAmount)
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totalNewInterest = totalNewInterest.Add(sdk.NewCoin(coin.Denom, coinInterest.TruncateInt()))
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}
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}
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borrowIndex := types.NewBorrowInterestFactor(coin.Denom, interestFactorValue)
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newBorrowIndexes = append(newBorrowIndexes, borrowIndex)
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}
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return types.NewBorrow(borrow.Borrower, borrow.Amount.Add(totalNewInterest...), newBorrowIndexes)
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}
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