fix london hardfork check logic in json-rpc apis

Closes: #1067
Solution:
- Add `BaseFee` grpc query handler in evm module which also checks the current london hardfork status.

CHANGELOG.md

@@ -41,6 +41,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Bug Fixes
 
 * (rpc) [tharsis#1059](https://github.com/tharsis/ethermint/pull/1059) Remove unnecessary event filtering logic on the `eth_baseFee` JSON-RPC endpoint.
+* (rpc) [tharsis#1068](https://github.com/tharsis/ethermint/pull/1068) Fix london hardfork check logic in json-rpc apis.
 
 ## [v0.14.0] - 2022-04-19
 

app/ante/eth.go

@@ -263,7 +263,7 @@ func (ctd CanTransferDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate
 			return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid message type %T, expected %T", msg, (*evmtypes.MsgEthereumTx)(nil))
 		}
 
-		baseFee := ctd.evmKeeper.BaseFee(ctx, ethCfg)
+		baseFee := ctd.evmKeeper.GetBaseFee(ctx, ethCfg)
 
 		coreMsg, err := msgEthTx.AsMessage(signer, baseFee)
 		if err != nil {
@@ -427,7 +427,7 @@ func (vbd EthValidateBasicDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simu
 			params := vbd.evmKeeper.GetParams(ctx)
 			chainID := vbd.evmKeeper.ChainID()
 			ethCfg := params.ChainConfig.EthereumConfig(chainID)
-			baseFee := vbd.evmKeeper.BaseFee(ctx, ethCfg)
+			baseFee := vbd.evmKeeper.GetBaseFee(ctx, ethCfg)
 			if baseFee == nil && txData.TxType() == ethtypes.DynamicFeeTxType {
 				return ctx, sdkerrors.Wrap(ethtypes.ErrTxTypeNotSupported, "dynamic fee tx not supported")
 			}
@@ -511,7 +511,7 @@ func (mfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulat
 	if ctx.IsCheckTx() && !simulate {
 		params := mfd.evmKeeper.GetParams(ctx)
 		ethCfg := params.ChainConfig.EthereumConfig(mfd.evmKeeper.ChainID())
-		baseFee := mfd.evmKeeper.BaseFee(ctx, ethCfg)
+		baseFee := mfd.evmKeeper.GetBaseFee(ctx, ethCfg)
 		if baseFee == nil {
 			for _, msg := range tx.GetMsgs() {
 				ethMsg, ok := msg.(*evmtypes.MsgEthereumTx)

app/ante/interfaces.go

@@ -23,7 +23,7 @@ type EVMKeeper interface {
 	DeductTxCostsFromUserBalance(
 		ctx sdk.Context, msgEthTx evmtypes.MsgEthereumTx, txData evmtypes.TxData, denom string, homestead, istanbul, london bool,
 	) (sdk.Coins, error)
-	BaseFee(ctx sdk.Context, ethCfg *params.ChainConfig) *big.Int
+	GetBaseFee(ctx sdk.Context, ethCfg *params.ChainConfig) *big.Int
 	GetBalance(ctx sdk.Context, addr common.Address) *big.Int
 	ResetTransientGasUsed(ctx sdk.Context)
 }