fix: default base fee state in genesis (#919)

* fix defualt base fee state in genesis

Closes: #918
Solution:
- initialise the default base fee value in genesis

* changelog

CHANGELOG.md

@@ -65,6 +65,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (app) [tharsis#873](https://github.com/tharsis/ethermint/pull/873) Validate code hash in GenesisAccount
 * (evm) [tharsis#901](https://github.com/tharsis/ethermint/pull/901) Support multiple MsgEthereumTx in single tx.
 * (config) [tharsis#908](https://github.com/tharsis/ethermint/pull/908) Add api.enable flag for Cosmos SDK Rest server
+* (feemarket) [tharsis#919](https://github.com/tharsis/ethermint/pull/919) Initialize baseFee in default genesis state.
 
 ### Bug Fixes
 

x/evm/keeper/keeper_test.go

@@ -87,13 +87,16 @@ func (suite *KeeperTestSuite) DoSetupTest(t require.TestingT) {
 	suite.consAddress = sdk.ConsAddress(priv.PubKey().Address())
 
 	suite.app = app.Setup(checkTx, func(app *app.EthermintApp, genesis simapp.GenesisState) simapp.GenesisState {
+		feemarketGenesis := feemarkettypes.DefaultGenesisState()
 		if suite.enableFeemarket {
-			feemarketGenesis := feemarkettypes.DefaultGenesisState()
 			feemarketGenesis.Params.EnableHeight = 1
 			feemarketGenesis.Params.NoBaseFee = false
 			feemarketGenesis.BaseFee = sdk.NewInt(feemarketGenesis.Params.InitialBaseFee)
-			genesis[feemarkettypes.ModuleName] = app.AppCodec().MustMarshalJSON(feemarketGenesis)
+		} else {
+			feemarketGenesis.Params.NoBaseFee = true
+			feemarketGenesis.BaseFee = sdk.NewInt(0)
 		}
+		genesis[feemarkettypes.ModuleName] = app.AppCodec().MustMarshalJSON(feemarketGenesis)
 		if !suite.enableLondonHF {
 			evmGenesis := types.DefaultGenesisState()
 			maxInt := sdk.NewInt(math.MaxInt64)

x/evm/keeper/state_transition_test.go

@@ -501,7 +501,7 @@ func (suite *KeeperTestSuite) TestEVMConfig() {
 	suite.Require().NoError(err)
 	suite.Require().Equal(types.DefaultParams(), cfg.Params)
 	// london hardfork is enabled by default
-	suite.Require().Equal(new(big.Int), cfg.BaseFee)
+	suite.Require().Equal(big.NewInt(0), cfg.BaseFee)
 	suite.Require().Equal(suite.address, cfg.CoinBase)
 	suite.Require().Equal(types.DefaultParams().ChainConfig.EthereumConfig(big.NewInt(9000)), cfg.ChainConfig)
 }

x/feemarket/keeper/grpc_query_test.go

@@ -2,6 +2,7 @@ package keeper_test
 
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	ethparams "github.com/ethereum/go-ethereum/params"
 	"github.com/tharsis/ethermint/x/feemarket/types"
 )
 
@@ -41,9 +42,10 @@ func (suite *KeeperTestSuite) TestQueryBaseFee() {
 		expPass  bool
 	}{
 		{
-			"pass - nil Base Fee",
+			"pass - default Base Fee",
 			func() {
-				expRes = &types.QueryBaseFeeResponse{}
+				initialBaseFee := sdk.NewInt(ethparams.InitialBaseFee)
+				expRes = &types.QueryBaseFeeResponse{BaseFee: &initialBaseFee}
 			},
 			true,
 		},

x/feemarket/types/genesis.go

@@ -4,13 +4,15 @@ import (
 	"fmt"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 // DefaultGenesisState sets default fee market genesis state.
 func DefaultGenesisState() *GenesisState {
 	return &GenesisState{
-		Params:   DefaultParams(),
+		Params: DefaultParams(),
-		BaseFee:  sdk.ZeroInt(),
+		// the default base fee should be initialized because the default enable height is zero.
+		BaseFee:  sdk.NewIntFromUint64(params.InitialBaseFee),
 		BlockGas: 0,
 	}
 }