/
fee_validation.go
37 lines (28 loc) · 1.46 KB
/
fee_validation.go
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package types
import (
"fmt"
"cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
)
func ValidateMakerWithTakerFee(makerFeeRate, takerFeeRate, relayerFeeShareRate, minimalProtocolFeeRate sdk.Dec) error {
if makerFeeRate.GT(takerFeeRate) {
return ErrFeeRatesRelation
}
if !makerFeeRate.IsNegative() {
return nil
}
// if makerFeeRate is negative, must hold: takerFeeRate * (1 - relayerFeeShareRate) + makerFeeRate > minimalProtocolFeeRate
if takerFeeRate.Mul(sdk.OneDec().Sub(relayerFeeShareRate)).Add(makerFeeRate).LT(minimalProtocolFeeRate) {
errMsg := fmt.Sprintf("if makerFeeRate (%v) is negative, (takerFeeRate = %v) * (1 - relayerFeeShareRate = %v) + makerFeeRate < %v", makerFeeRate.String(), takerFeeRate.String(), relayerFeeShareRate.String(), minimalProtocolFeeRate.String())
return errors.Wrap(ErrFeeRatesRelation, errMsg)
}
return nil
}
func ValidateMakerWithTakerFeeAndDiscounts(makerFeeRate, takerFeeRate, relayerFeeShareRate, minimalProtocolFeeRate sdk.Dec, discountSchedule *FeeDiscountSchedule) error {
smallestTakerFeeRate := takerFeeRate
if makerFeeRate.IsNegative() && discountSchedule != nil && len(discountSchedule.TierInfos) > 0 {
maxTakerDiscount := discountSchedule.TierInfos[len(discountSchedule.TierInfos)-1].TakerDiscountRate
smallestTakerFeeRate = smallestTakerFeeRate.Mul(sdk.OneDec().Sub(maxTakerDiscount))
}
return ValidateMakerWithTakerFee(makerFeeRate, smallestTakerFeeRate, relayerFeeShareRate, minimalProtocolFeeRate)
}