fix: use GetParamsIfExists() to fetch old params (#1842)

Co-authored-by: blindchaser <zengyiren@hotmail.com>

Author: blindchaser

x/evm/keeper/params.go

@@ -21,6 +21,12 @@ func (k *Keeper) GetParams(ctx sdk.Context) types.Params {
 	return params
 }
 
+func (k *Keeper) GetParamsIfExists(ctx sdk.Context) types.Params {
+	params := types.Params{}
+	k.Paramstore.GetParamSetIfExists(ctx, &params)
+	return params
+}
+
 func (k *Keeper) GetBaseDenom(ctx sdk.Context) string {
 	return BaseDenom
 }

x/evm/keeper/params_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 	"time"
 
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	testkeeper "github.com/sei-protocol/sei-chain/testutil/keeper"
 	"github.com/sei-protocol/sei-chain/x/evm/types"
 	"github.com/stretchr/testify/require"
@@ -20,3 +21,28 @@ func TestParams(t *testing.T) {
 
 	require.Nil(t, k.GetParams(ctx).Validate())
 }
+
+func TestGetParamsIfExists(t *testing.T) {
+	k := &testkeeper.EVMTestApp.EvmKeeper
+	ctx := testkeeper.EVMTestApp.GetContextForDeliverTx([]byte{}).WithBlockTime(time.Now())
+
+	// Define the expected parameters
+	expectedParams := types.Params{
+		PriorityNormalizer: sdk.NewDec(1),
+		BaseFeePerGas:      sdk.NewDec(1),
+	}
+
+	// Set only a subset of the parameters in the keeper
+	k.Paramstore.Set(ctx, types.KeyPriorityNormalizer, expectedParams.PriorityNormalizer)
+	k.Paramstore.Set(ctx, types.KeyBaseFeePerGas, expectedParams.BaseFeePerGas)
+
+	// Retrieve the parameters using GetParamsIfExists
+	params := k.GetParamsIfExists(ctx)
+
+	// Assert that the retrieved parameters match the expected parameters
+	require.Equal(t, expectedParams.PriorityNormalizer, params.PriorityNormalizer)
+	require.Equal(t, expectedParams.BaseFeePerGas, params.BaseFeePerGas)
+
+	// Assert that the missing parameter has its default value
+	require.Equal(t, types.DefaultParams().DeliverTxHookWasmGasLimit, params.DeliverTxHookWasmGasLimit)
+}

x/evm/migrations/migrate_deliver_tx_gas_limit.go

@@ -7,10 +7,10 @@ import (
 )
 
 func MigrateDeliverTxHookWasmGasLimitParam(ctx sdk.Context, k *keeper.Keeper) error {
-	// Fetch the current parameters
-	keeperParams := k.GetParams(ctx)
+	// Fetch the v11 parameters
+	keeperParams := k.GetParamsIfExists(ctx)
 
-	// Update DeliverTxHookWasmGasLimit to the default value
+	// Add DeliverTxHookWasmGasLimit to with default value
 	keeperParams.DeliverTxHookWasmGasLimit = types.DefaultParams().DeliverTxHookWasmGasLimit
 
 	// Set the updated parameters back in the keeper