feat: Allow decimal gas prices

pkg/client/tx/client.go

@@ -105,7 +105,7 @@ type txClient struct {
 	txTimeoutPool txTimeoutPool
 
 	// gasPrices is the gas unit prices used for sending transactions.
-	gasPrices cosmostypes.Coins
+	gasPrices cosmostypes.DecCoins
 
 	// connRetryLimit is the number of times the underlying replay client
 	// should retry in the event that it encounters an error or its connection is interrupted.
@@ -253,8 +253,19 @@ func (txnClient *txClient) SignAndBroadcast(
 	// Coin multiplication prevents doing it using a zero value.
 	if gasLimit > 0 {
 		txBuilder.SetGasLimit(gasLimit)
-		feeAmount := txnClient.gasPrices.MulInt(math.NewIntFromUint64(gasLimit))
-		txBuilder.SetFeeAmount(feeAmount)
+
+		gasLimitDec := math.LegacyNewDec(int64(gasLimit))
+		feeAmountDec := txnClient.gasPrices.MulDec(gasLimitDec)
+
+		feeCoins, changeCoins := feeAmountDec.TruncateDecimal()
+		// Ensure that any decimal remainder is added to the corresponding coin as a
+		// whole number.
+		for i, coin := range feeCoins {
+			if !changeCoins[i].IsZero() {
+				feeCoins[i] = coin.AddAmount(math.OneInt())
+			}
+		}
+		txBuilder.SetFeeAmount(feeCoins)
 	}
 
 	txBuilder.SetTimeoutHeight(uint64(timeoutHeight))

pkg/client/tx/options.go

@@ -34,7 +34,7 @@ func WithConnRetryLimit(limit int) client.TxClientOption {
 }
 
 // WithGasPrices sets the gas price to be used when constructing transactions.
-func WithGasPrices(gasPrices cosmostypes.Coins) client.TxClientOption {
+func WithGasPrices(gasPrices cosmostypes.DecCoins) client.TxClientOption {
 	return func(client client.TxClient) {
 		client.(*txClient).gasPrices = gasPrices
 	}

pkg/deps/config/suppliers.go

@@ -12,6 +12,7 @@ import (
 	"github.com/cosmos/gogoproto/grpc"
 	"github.com/spf13/cobra"
 
+	"github.com/pokt-network/poktroll/app/volatile"
 	"github.com/pokt-network/poktroll/pkg/client/block"
 	"github.com/pokt-network/poktroll/pkg/client/delegation"
 	"github.com/pokt-network/poktroll/pkg/client/events"
@@ -359,7 +360,7 @@ func NewSupplySupplierClientsFn(signingKeyNames []string) SupplierFn {
 			return nil, err
 		}
 
-		gasPrices, err := cosmostypes.ParseCoinsNormalized(gasPriceStr)
+		gasPrices, err := cosmostypes.ParseDecCoins(gasPriceStr)
 		if err != nil {
 			return nil, err
 		}
@@ -482,10 +483,18 @@ func newSupplyTxClientsFn(
 	ctx context.Context,
 	deps depinject.Config,
 	signingKeyName string,
-	gasPrices cosmostypes.Coins,
+	gasPrices cosmostypes.DecCoins,
 ) (depinject.Config, error) {
-	uPOKTFound, _ := gasPrices.Find("upokt")
-	if !uPOKTFound {
+	// Ensure that the gas prices include upokt
+	uPOKTDenomFound := false
+	for _, gasPrice := range gasPrices {
+		if gasPrice.Denom == volatile.DenomuPOKT {
+			uPOKTDenomFound = true
+			break
+		}
+	}
+
+	if !uPOKTDenomFound {
 		return nil, fmt.Errorf("gas prices must include upokt")
 	}