0g-chain/x/hard/keeper/deposit.go
Denali Marsh bc110ce609
Hard: LTV index refactor (#758)
* add set/delete/update ltv methods

* refactor borrow logic

* basic updates to keeper logic for compile

* Add deposit index set/delete/update keeper methods

* refactor deposit logic

* refactor repay logic

* update withdraw logic

* introduce DeleteDepositBorrowAndLtvIndex

* remove unused bool from AttemptKeeperLiquidation

* remove comments (transitioned to asana cards)

* catch multiple error types in liquidation loop
2021-01-07 22:40:25 +01:00

202 lines
6.7 KiB
Go

package keeper
import (
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
supplyExported "github.com/cosmos/cosmos-sdk/x/supply/exported"
"github.com/kava-labs/kava/x/hard/types"
)
// Deposit deposit
func (k Keeper) Deposit(ctx sdk.Context, depositor sdk.AccAddress, coins sdk.Coins) error {
// Set any new denoms' global supply index to 1.0
for _, coin := range coins {
_, foundInterestFactor := k.GetSupplyInterestFactor(ctx, coin.Denom)
if !foundInterestFactor {
_, foundMm := k.GetMoneyMarket(ctx, coin.Denom)
if foundMm {
k.SetSupplyInterestFactor(ctx, coin.Denom, sdk.OneDec())
}
}
}
// Get current stored LTV based on stored borrows/deposits
prevLtv, err := k.GetStoreLTV(ctx, depositor)
if err != nil {
return err
}
// Sync any outstanding interest
k.SyncBorrowInterest(ctx, depositor)
k.SyncSupplyInterest(ctx, depositor)
err = k.ValidateDeposit(ctx, coins)
if err != nil {
return err
}
err = k.supplyKeeper.SendCoinsFromAccountToModule(ctx, depositor, types.ModuleAccountName, coins)
if err != nil {
if strings.Contains(err.Error(), "insufficient account funds") {
accCoins := k.accountKeeper.GetAccount(ctx, depositor).SpendableCoins(ctx.BlockTime())
for _, coin := range coins {
_, isNegative := accCoins.SafeSub(sdk.NewCoins(coin))
if isNegative {
return sdkerrors.Wrapf(types.ErrBorrowExceedsAvailableBalance,
"insufficient funds: the requested deposit amount of %s exceeds the total available account funds of %s%s",
coin, accCoins.AmountOf(coin.Denom), coin.Denom,
)
}
}
}
}
if err != nil {
return err
}
// The first time a user deposits a denom we add it the user's supply interest factor index
var supplyInterestFactors types.SupplyInterestFactors
currDeposit, foundDeposit := k.GetDeposit(ctx, depositor)
// On user's first deposit, build deposit index list containing denoms and current global deposit index value
if foundDeposit {
// If the coin denom to be deposited is not in the user's existing deposit, we add it deposit index
for _, coin := range coins {
if !sdk.NewCoins(coin).DenomsSubsetOf(currDeposit.Amount) {
supplyInterestFactorValue, _ := k.GetSupplyInterestFactor(ctx, coin.Denom)
supplyInterestFactor := types.NewSupplyInterestFactor(coin.Denom, supplyInterestFactorValue)
supplyInterestFactors = append(supplyInterestFactors, supplyInterestFactor)
}
}
// Concatenate new deposit interest factors to existing deposit interest factors
supplyInterestFactors = append(supplyInterestFactors, currDeposit.Index...)
} else {
for _, coin := range coins {
supplyInterestFactorValue, _ := k.GetSupplyInterestFactor(ctx, coin.Denom)
supplyInterestFactor := types.NewSupplyInterestFactor(coin.Denom, supplyInterestFactorValue)
supplyInterestFactors = append(supplyInterestFactors, supplyInterestFactor)
}
}
// Calculate new deposit amount
var amount sdk.Coins
if foundDeposit {
amount = currDeposit.Amount.Add(coins...)
} else {
amount = coins
}
// Update the depositer's amount and supply interest factors in the store
deposit := types.NewDeposit(depositor, amount, supplyInterestFactors)
// Calculate the new Loan-to-Value ratio of Deposit-to-Borrow
borrow, _ := k.GetBorrow(ctx, depositor)
newLtv, err := k.CalculateLtv(ctx, deposit, borrow)
if err != nil {
return err
}
k.UpdateDepositAndLtvIndex(ctx, deposit, newLtv, prevLtv)
// Update total supplied amount by newly supplied coins. Don't add user's pending interest as
// it has already been included in the total supplied coins by the BeginBlocker.
k.IncrementSuppliedCoins(ctx, coins)
ctx.EventManager().EmitEvent(
sdk.NewEvent(
types.EventTypeHardDeposit,
sdk.NewAttribute(sdk.AttributeKeyAmount, coins.String()),
sdk.NewAttribute(types.AttributeKeyDepositor, deposit.Depositor.String()),
),
)
return nil
}
// ValidateDeposit validates a deposit
func (k Keeper) ValidateDeposit(ctx sdk.Context, coins sdk.Coins) error {
params := k.GetParams(ctx)
for _, depCoin := range coins {
found := false
for _, lps := range params.LiquidityProviderSchedules {
if lps.DepositDenom == depCoin.Denom {
found = true
}
}
if !found {
return sdkerrors.Wrapf(types.ErrInvalidDepositDenom, "liquidity provider denom %s not found", depCoin.Denom)
}
}
return nil
}
// GetTotalDeposited returns the total amount deposited for the input deposit type and deposit denom
func (k Keeper) GetTotalDeposited(ctx sdk.Context, depositDenom string) (total sdk.Int) {
var macc supplyExported.ModuleAccountI
macc = k.supplyKeeper.GetModuleAccount(ctx, types.ModuleAccountName)
return macc.GetCoins().AmountOf(depositDenom)
}
// IncrementSuppliedCoins increments the total amount of supplied coins by the newCoins parameter
func (k Keeper) IncrementSuppliedCoins(ctx sdk.Context, newCoins sdk.Coins) {
suppliedCoins, found := k.GetSuppliedCoins(ctx)
if !found {
if !newCoins.Empty() {
k.SetSuppliedCoins(ctx, newCoins)
}
} else {
k.SetSuppliedCoins(ctx, suppliedCoins.Add(newCoins...))
}
}
// DecrementSuppliedCoins decrements the total amount of supplied coins by the coins parameter
func (k Keeper) DecrementSuppliedCoins(ctx sdk.Context, coins sdk.Coins) error {
suppliedCoins, found := k.GetSuppliedCoins(ctx)
if !found {
return sdkerrors.Wrapf(types.ErrSuppliedCoinsNotFound, "cannot withdraw if no coins are deposited")
}
updatedSuppliedCoins, isAnyNegative := suppliedCoins.SafeSub(coins)
if isAnyNegative {
return types.ErrNegativeSuppliedCoins
}
k.SetSuppliedCoins(ctx, updatedSuppliedCoins)
return nil
}
// GetSupplyBalance gets the user's total supply balance (supply balance + pending interest)
func (k Keeper) GetSupplyBalance(ctx sdk.Context, depositor sdk.AccAddress) sdk.Coins {
supplyBalance := sdk.Coins{}
deposit, found := k.GetDeposit(ctx, depositor)
if !found {
return supplyBalance
}
totalNewInterest := sdk.Coins{}
for _, coin := range deposit.Amount {
interestFactorValue, foundInterestFactorValue := k.GetSupplyInterestFactor(ctx, coin.Denom)
if foundInterestFactorValue {
// Locate the interest factor by coin denom in the user's list of interest factors
foundAtIndex := -1
for i := range deposit.Index {
if deposit.Index[i].Denom == coin.Denom {
foundAtIndex = i
break
}
}
// Calculate interest owed by user for this asset
if foundAtIndex != -1 {
storedAmount := sdk.NewDecFromInt(deposit.Amount.AmountOf(coin.Denom))
userLastInterestFactor := deposit.Index[foundAtIndex].Value
coinInterest := (storedAmount.Quo(userLastInterestFactor).Mul(interestFactorValue)).Sub(storedAmount)
totalNewInterest = totalNewInterest.Add(sdk.NewCoin(coin.Denom, coinInterest.TruncateInt()))
}
}
}
return deposit.Amount.Add(totalNewInterest...)
}