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fix: prevent cdp sim from attempting to draw too much debt (#438)

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* fix: account for all fees when drawing more debt
This commit is contained in:
Kevin Davis 2020-04-15 14:54:38 -04:00 committed by GitHub
parent 55b73e36ee
commit 4cde3ba577
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1 changed files with 3 additions and 1 deletions
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4
x/cdp/simulation/operations/msgs.go
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@ -122,8 +122,10 @@ func SimulateMsgCdp(ak auth.AccountKeeper, k cdp.Keeper, pfk pricefeed.Keeper) s
if shouldDraw(r) { if shouldDraw(r) {
collateralShifted := ShiftDec(sdk.NewDecFromInt(existingCDP.Collateral.AmountOf(randCollateralParam.Denom)), randCollateralParam.ConversionFactor.Neg()) collateralShifted := ShiftDec(sdk.NewDecFromInt(existingCDP.Collateral.AmountOf(randCollateralParam.Denom)), randCollateralParam.ConversionFactor.Neg())
collateralValue := collateralShifted.Mul(priceShifted) collateralValue := collateralShifted.Mul(priceShifted)
newFeesAccumulated := k.CalculateFees(ctx, existingCDP.Principal, sdk.NewInt(ctx.BlockTime().Unix()-existingCDP.FeesUpdated.Unix()), randCollateralParam.Denom).AmountOf(randDebtParam.Denom)
totalFees := existingCDP.AccumulatedFees.AmountOf(randCollateralParam.Denom).Add(newFeesAccumulated)
// given the current collateral value, calculate how much debt we could add while maintaining a valid liquidation ratio // given the current collateral value, calculate how much debt we could add while maintaining a valid liquidation ratio
debt := (existingCDP.Principal.Add(existingCDP.AccumulatedFees)).AmountOf(randDebtParam.Denom) debt := existingCDP.Principal.AmountOf(randDebtParam.Denom).Add(totalFees)
maxTotalDebt := collateralValue.Quo(randCollateralParam.LiquidationRatio) maxTotalDebt := collateralValue.Quo(randCollateralParam.LiquidationRatio)
maxDebt := maxTotalDebt.Sub(sdk.NewDecFromInt(debt)).TruncateInt() maxDebt := maxTotalDebt.Sub(sdk.NewDecFromInt(debt)).TruncateInt()
if maxDebt.LTE(sdk.OneInt()) { if maxDebt.LTE(sdk.OneInt()) {