feat!: use harcoded global min gas price check in ProcessProposal (#2…

…985)

## Overview

Fixes - #1621 

Introducing a global minimum gas price, a consensus change enforcing a
lower bound for all transactions.

app/ante/ante.go

@@ -39,7 +39,7 @@ func NewAnteHandler(
 		ante.NewConsumeGasForTxSizeDecorator(accountKeeper),
 		// Ensure the feepayer (fee granter or first signer) has enough funds to pay for the tx.
 		// Side effect: deducts fees from the fee payer. Sets the tx priority in context.
-		ante.NewDeductFeeDecorator(accountKeeper, bankKeeper, feegrantKeeper, checkTxFeeWithValidatorMinGasPrices),
+		ante.NewDeductFeeDecorator(accountKeeper, bankKeeper, feegrantKeeper, CheckTxFeeWithGlobalMinGasPrices),
 		// Set public keys in the context for fee-payer and all signers.
 		// Contract: must be called before all signature verification decorators.
 		ante.NewSetPubKeyDecorator(accountKeeper),

app/ante/fee_checker.go

@@ -1,7 +1,11 @@
 package ante
 
 import (
+	"fmt"
+
 	errors "cosmossdk.io/errors"
+	"github.com/celestiaorg/celestia-app/pkg/appconsts"
+	v1 "github.com/celestiaorg/celestia-app/pkg/appconsts/v1"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerror "github.com/cosmos/cosmos-sdk/types/errors"
 )
@@ -11,41 +15,35 @@ const (
 	priorityScalingFactor = 1_000_000
 )
 
-// checkTxFeeWithValidatorMinGasPrices implements the default fee logic, where the minimum price per
-// unit of gas is fixed and set by each validator, and the tx priority is computed from the gas price.
-func checkTxFeeWithValidatorMinGasPrices(ctx sdk.Context, tx sdk.Tx) (sdk.Coins, int64, error) {
+// CheckTxFeeWithGlobalMinGasPrices implements the default fee logic, where the minimum price per
+// unit of gas is fixed and set globally, and the tx priority is computed from the gas price.
+func CheckTxFeeWithGlobalMinGasPrices(ctx sdk.Context, tx sdk.Tx) (sdk.Coins, int64, error) {
 	feeTx, ok := tx.(sdk.FeeTx)
 	if !ok {
 		return nil, 0, errors.Wrap(sdkerror.ErrTxDecode, "Tx must be a FeeTx")
 	}
 
-	feeCoins := feeTx.GetFee()
+	fee := feeTx.GetFee().AmountOf(appconsts.BondDenom)
 	gas := feeTx.GetGas()
 
-	// Ensure that the provided fees meet a minimum threshold for the validator,
-	// if this is a CheckTx. This is only for local mempool purposes, and thus
-	// is only ran on check tx.
-	if ctx.IsCheckTx() {
-		minGasPrices := ctx.MinGasPrices()
-		if !minGasPrices.IsZero() {
-			requiredFees := make(sdk.Coins, len(minGasPrices))
+	// global minimum fee only applies to app versions greater than one
+	if ctx.BlockHeader().Version.App > v1.Version {
+		// convert the global minimum gas price to a big.Int
+		globalMinGasPrice, err := sdk.NewDecFromStr(fmt.Sprintf("%f", appconsts.GlobalMinGasPrice))
+		if err != nil {
+			return nil, 0, errors.Wrap(err, "invalid GlobalMinGasPrice")
+		}
 
-			// Determine the required fees by multiplying each required minimum gas
-			// price by the gas limit, where fee = ceil(minGasPrice * gasLimit).
-			glDec := sdk.NewDec(int64(gas))
-			for i, gp := range minGasPrices {
-				fee := gp.Amount.Mul(glDec)
-				requiredFees[i] = sdk.NewCoin(gp.Denom, fee.Ceil().RoundInt())
-			}
+		gasInt := sdk.NewIntFromUint64(gas)
+		minFee := globalMinGasPrice.MulInt(gasInt).RoundInt()
 
-			if !feeCoins.IsAnyGTE(requiredFees) {
-				return nil, 0, errors.Wrapf(sdkerror.ErrInsufficientFee, "insufficient fees; got: %s required: %s", feeCoins, requiredFees)
-			}
+		if !fee.GTE(minFee) {
+			return nil, 0, errors.Wrapf(sdkerror.ErrInsufficientFee, "insufficient fees; got: %s required: %s", fee, minFee)
 		}
 	}
 
-	priority := getTxPriority(feeCoins, int64(gas))
-	return feeCoins, priority, nil
+	priority := getTxPriority(feeTx.GetFee(), int64(gas))
+	return feeTx.GetFee(), priority, nil
 }
 
 // getTxPriority returns a naive tx priority based on the amount of the smallest denomination of the gas price

app/ante/min_fee_test.go

@@ -0,0 +1,111 @@
+package ante_test
+
+import (
+	"math"
+	"testing"
+
+	"github.com/celestiaorg/celestia-app/app"
+	"github.com/celestiaorg/celestia-app/app/ante"
+	"github.com/celestiaorg/celestia-app/app/encoding"
+	"github.com/celestiaorg/celestia-app/pkg/appconsts"
+	"github.com/celestiaorg/celestia-app/test/util/testnode"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
+	"github.com/stretchr/testify/require"
+	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
+	version "github.com/tendermint/tendermint/proto/tendermint/version"
+)
+
+func TestCheckTxFeeWithGlobalMinGasPrices(t *testing.T) {
+	encCfg := encoding.MakeConfig(app.ModuleEncodingRegisters...)
+
+	builder := encCfg.TxConfig.NewTxBuilder()
+	err := builder.SetMsgs(banktypes.NewMsgSend(
+		testnode.RandomAddress().(sdk.AccAddress),
+		testnode.RandomAddress().(sdk.AccAddress),
+		sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, 10))),
+	)
+	require.NoError(t, err)
+
+	feeAmount := int64(1000)
+
+	ctx := sdk.Context{}
+
+	testCases := []struct {
+		name       string
+		fee        sdk.Coins
+		gasLimit   uint64
+		appVersion uint64
+		expErr     bool
+	}{
+		{
+			name:       "bad tx; fee below required minimum",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, feeAmount-1)),
+			gasLimit:   uint64(float64(feeAmount) / appconsts.GlobalMinGasPrice),
+			appVersion: uint64(2),
+			expErr:     true,
+		},
+		{
+			name:       "good tx; fee equal to required minimum",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, feeAmount)),
+			gasLimit:   uint64(float64(feeAmount) / appconsts.GlobalMinGasPrice),
+			appVersion: uint64(2),
+			expErr:     false,
+		},
+		{
+			name:       "good tx; fee above required minimum",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, feeAmount+1)),
+			gasLimit:   uint64(float64(feeAmount) / appconsts.GlobalMinGasPrice),
+			appVersion: uint64(2),
+			expErr:     false,
+		},
+		{
+			name:       "good tx; with no fee (v1)",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, feeAmount)),
+			gasLimit:   uint64(float64(feeAmount) / appconsts.GlobalMinGasPrice),
+			appVersion: uint64(1),
+			expErr:     false,
+		},
+		{
+			name:       "good tx; gas limit and fee are maximum values",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, math.MaxInt64)),
+			gasLimit:   math.MaxUint64,
+			appVersion: uint64(2),
+			expErr:     false,
+		},
+		{
+			name:       "bad tx; gas limit and fee are 0",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, 0)),
+			gasLimit:   0,
+			appVersion: uint64(2),
+			expErr:     false,
+		},
+		{
+			name:       "good tx; minFee = 0.8, rounds up to 1",
+			fee:        sdk.NewCoins(sdk.NewInt64Coin(appconsts.BondDenom, feeAmount)),
+			gasLimit:   400,
+			appVersion: uint64(2),
+			expErr:     false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			builder.SetGasLimit(tc.gasLimit)
+			builder.SetFeeAmount(tc.fee)
+			tx := builder.GetTx()
+
+			ctx = ctx.WithBlockHeader(tmproto.Header{
+				Version: version.Consensus{
+					App: tc.appVersion,
+				},
+			})
+			_, _, err := ante.CheckTxFeeWithGlobalMinGasPrices(ctx, tx)
+			if tc.expErr {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

app/test/max_total_blob_size_test.go

@@ -78,7 +78,7 @@ func (s *MaxTotalBlobSizeSuite) TestErrTotalBlobSizeTooLarge() {
 
 	for _, tc := range testCases {
 		s.Run(tc.name, func() {
-			blobTx, err := signer.CreatePayForBlob([]*blob.Blob{tc.blob}, user.SetGasLimit(1e9))
+			blobTx, err := signer.CreatePayForBlob([]*blob.Blob{tc.blob}, user.SetGasLimit(1e9), user.SetFee(2000000))
 			require.NoError(t, err)
 			subCtx, cancel := context.WithTimeout(s.cctx.GoContext(), 30*time.Second)
 			defer cancel()

app/test/prepare_proposal_context_test.go

@@ -87,7 +87,7 @@ func TestTimeInPrepareProposalContext(t *testing.T) {
 			addr := testfactory.GetAddress(cctx.Keyring, account)
 			signer, err := user.SetupSigner(cctx.GoContext(), cctx.Keyring, cctx.GRPCClient, addr, ecfg)
 			require.NoError(t, err)
-			res, err := signer.SubmitTx(cctx.GoContext(), msgs, user.SetGasLimit(1000000), user.SetFee(1))
+			res, err := signer.SubmitTx(cctx.GoContext(), msgs, user.SetGasLimit(1000000), user.SetFee(2000))
 			if tt.expectedCode != abci.CodeTypeOK {
 				require.Error(t, err)
 			} else {