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Cache redundant calculation in cdp RepayPrinciple (#569)

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* fix exhibit 29 and remove redundant calcuation

* use better naming (totalPrincipal instead of totalDebt) and add comment
for future maintainers
This commit is contained in:
Nick DeLuca 2020-06-11 15:14:47 -05:00 committed by GitHub
parent 0ddae8609e
commit 3e63356c58
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1 changed files with 5 additions and 2 deletions
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7
x/cdp/keeper/draw.go
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@ -85,8 +85,11 @@ func (k Keeper) RepayPrincipal(ctx sdk.Context, owner sdk.AccAddress, denom stri
return err return err
} }
// Note: assumes cdp.Principal and cdp.AccumulatedFees don't change during calculations
totalPrincipal := cdp.Principal.Add(cdp.AccumulatedFees)
// calculate fee and principal payment // calculate fee and principal payment
feePayment, principalPayment := k.calculatePayment(ctx, cdp.Principal.Add(cdp.AccumulatedFees), cdp.AccumulatedFees, payment) feePayment, principalPayment := k.calculatePayment(ctx, totalPrincipal, cdp.AccumulatedFees, payment)
err = k.validatePrincipalPayment(ctx, cdp, principalPayment) err = k.validatePrincipalPayment(ctx, cdp, principalPayment)
if err != nil { if err != nil {
@ -131,7 +134,7 @@ func (k Keeper) RepayPrincipal(ctx sdk.Context, owner sdk.AccAddress, denom stri
) )
// remove the old collateral:debt ratio index // remove the old collateral:debt ratio index
oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees)) oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, totalPrincipal)
k.RemoveCdpCollateralRatioIndex(ctx, denom, cdp.ID, oldCollateralToDebtRatio) k.RemoveCdpCollateralRatioIndex(ctx, denom, cdp.ID, oldCollateralToDebtRatio)
// update cdp state // update cdp state