refactor(x/precisebank): Replace FractionalAmount wrapper with func (#1961)

Removal of unnecessary wrapper type, along with using conversionFactor-1 instead of maxFractionalAmount

x/precisebank/keeper/fractional_balance.go

@@ -48,7 +48,7 @@ func (k *Keeper) SetFractionalBalance(
 
 	// Ensure the fractional balance is valid before setting it. Use the
 	// NewFractionalAmountFromInt wrapper to use its Validate() method.
-	if err := types.NewFractionalAmountFromInt(amount).Validate(); err != nil {
+	if err := types.ValidateFractionalAmount(amount); err != nil {
 		panic(fmt.Errorf("amount is invalid: %w", err))
 	}
 

x/precisebank/keeper/invariants.go

@@ -104,7 +104,7 @@ func ValidFractionalAmountsInvariant(k Keeper) sdk.Invariant {
 		)
 
 		k.IterateFractionalBalances(ctx, func(addr sdk.AccAddress, amount sdkmath.Int) bool {
-			if err := types.NewFractionalAmountFromInt(amount).Validate(); err != nil {
+			if err := types.ValidateFractionalAmount(amount); err != nil {
 				count++
 				msg += fmt.Sprintf("\t%s has an invalid fractional amount of %s\n", addr, amount)
 			}
@@ -133,7 +133,7 @@ func ValidRemainderAmountInvariant(k Keeper) sdk.Invariant {
 
 		if !remainderAmount.IsZero() {
 			// Only validate if non-zero, as zero is default value
-			if err := types.NewFractionalAmountFromInt(remainderAmount).Validate(); err != nil {
+			if err := types.ValidateFractionalAmount(remainderAmount); err != nil {
 				broken = true
 				msg = fmt.Sprintf("remainder amount is invalid: %s", err)
 			}

x/precisebank/keeper/remainder_amount.go

@@ -43,7 +43,7 @@ func (k *Keeper) SetRemainderAmount(
 
 	// Ensure the remainder is valid before setting it. Follows the same
 	// validation as FractionalBalance with the same value range.
-	if err := types.NewFractionalAmountFromInt(amount).Validate(); err != nil {
+	if err := types.ValidateFractionalAmount(amount); err != nil {
 		panic(fmt.Errorf("remainder amount is invalid: %w", err))
 	}
 

x/precisebank/types/fractional_amount.go

@@ -1,41 +0,0 @@
-package types
-
-import (
-	fmt "fmt"
-
-	sdkmath "cosmossdk.io/math"
-)
-
-// FractionalAmount represents a fractional amount between the valid range of 1
-// and maxFractionalAmount. This wraps an sdkmath.Int to provide additional
-// validation methods so it can be re-used in multiple places.
-type FractionalAmount struct {
-	sdkmath.Int
-}
-
-// NewFractionalAmountFromInt creates a new FractionalAmount from an sdkmath.Int.
-func NewFractionalAmountFromInt(i sdkmath.Int) FractionalAmount {
-	return FractionalAmount{i}
-}
-
-// NewFractionalAmount creates a new FractionalAmount from an int64.
-func NewFractionalAmount(i int64) FractionalAmount {
-	return FractionalAmount{sdkmath.NewInt(i)}
-}
-
-// Validate checks if the FractionalAmount is valid.
-func (f FractionalAmount) Validate() error {
-	if f.IsNil() {
-		return fmt.Errorf("nil amount")
-	}
-
-	if !f.IsPositive() {
-		return fmt.Errorf("non-positive amount %v", f)
-	}
-
-	if f.GT(maxFractionalAmount) {
-		return fmt.Errorf("amount %v exceeds max of %v", f, maxFractionalAmount)
-	}
-
-	return nil
-}

x/precisebank/types/fractional_balance.go

@@ -1,18 +1,15 @@
 package types
 
 import (
+	fmt "fmt"
+
 	sdkmath "cosmossdk.io/math"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
-var (
-	// conversionFactor is used to convert the fractional balance to integer
-	// balances.
-	conversionFactor = sdkmath.NewInt(1_000_000_000_000)
-	// maxFractionalAmount is the largest valid value in a FractionalBalance amount.
-	// This is for direct internal use so that there are no extra allocations.
-	maxFractionalAmount = conversionFactor.SubRaw(1)
-)
+// conversionFactor is used to convert the fractional balance to integer
+// balances.
+var conversionFactor = sdkmath.NewInt(1_000_000_000_000)
 
 // ConversionFactor returns a copy of the conversionFactor used to convert the
 // fractional balance to integer balances. This is also 1 greater than the max
@@ -39,5 +36,24 @@ func (fb FractionalBalance) Validate() error {
 	}
 
 	// Validate the amount with the FractionalAmount wrapper
-	return NewFractionalAmountFromInt(fb.Amount).Validate()
+	return ValidateFractionalAmount(fb.Amount)
+}
+
+// ValidateFractionalAmount checks if an sdkmath.Int is a valid fractional
+// amount, ensuring it is positive and less than or equal to the maximum
+// fractional amount.
+func ValidateFractionalAmount(amt sdkmath.Int) error {
+	if amt.IsNil() {
+		return fmt.Errorf("nil amount")
+	}
+
+	if !amt.IsPositive() {
+		return fmt.Errorf("non-positive amount %v", amt)
+	}
+
+	if amt.GTE(conversionFactor) {
+		return fmt.Errorf("amount %v exceeds max of %v", amt, conversionFactor.SubRaw(1))
+	}
+
+	return nil
 }

x/precisebank/types/genesis.go

@@ -40,7 +40,7 @@ func (gs *GenesisState) Validate() error {
 	}
 
 	if gs.Remainder.GTE(conversionFactor) {
-		return fmt.Errorf("remainder %v exceeds max of %v", gs.Remainder, maxFractionalAmount)
+		return fmt.Errorf("remainder %v exceeds max of %v", gs.Remainder, conversionFactor.SubRaw(1))
 	}
 
 	// Determine if sum(fractionalBalances) + remainder = whole integer value