fix: gas_price & eth_getBlockByNumber

rpc/ethereum/backend/backend.go

@@ -415,6 +415,8 @@ func (e *EVMBackend) EthBlockFromTendermint(
 		ConsAddress: sdk.ConsAddress(block.Header.ProposerAddress).String(),
 	}
 
+	var validatorAccAddr sdk.AccAddress
+
 	res, err := e.queryClient.ValidatorAccount(ctx, req)
 	if err != nil {
 		e.logger.Debug(
@@ -423,15 +425,16 @@ func (e *EVMBackend) EthBlockFromTendermint(
 			"cons-address", req.ConsAddress,
 			"error", err.Error(),
 		)
-		return nil, err
-	}
-
-	addr, err := sdk.AccAddressFromBech32(res.AccountAddress)
-	if err != nil {
-		return nil, err
+		// use zero address as the validator operator address
+		validatorAccAddr = sdk.AccAddress(common.Address{}.Bytes())
+	} else {
+		validatorAccAddr, err = sdk.AccAddressFromBech32(res.AccountAddress)
+		if err != nil {
+			return nil, err
+		}
 	}
 
-	validatorAddr := common.BytesToAddress(addr)
+	validatorAddr := common.BytesToAddress(validatorAccAddr)
 
 	gasLimit, err := types.BlockMaxGasFromConsensusParams(ctx, e.clientCtx, block.Height)
 	if err != nil {

rpc/ethereum/backend/feebackend.go

@@ -26,6 +26,15 @@ func (s sortGasAndReward) Swap(i, j int) {
 }
 
 func (s sortGasAndReward) Less(i, j int) bool {
+	//   -1 if x <  y
+	//    0 if x == y
+	//   +1 if x >  y
+	if s[i].reward == nil {
+		return true
+	}
+	if s[j].reward == nil {
+		return false
+	}
 	return s[i].reward.Cmp(s[j].reward) < 0
 }
 

rpc/ethereum/namespaces/eth/api.go

@@ -211,6 +211,9 @@ func (e *PublicAPI) GasPrice() (*hexutil.Big, error) {
 	} else {
 		result = big.NewInt(e.backend.RPCMinGasPrice())
 	}
+	if result.Cmp(new(big.Int).SetUint64(0)) == 0 {
+		result = big.NewInt(e.backend.RPCMinGasPrice())
+	}
 
 	return (*hexutil.Big)(result), nil
 }