rpc: protocol version (#575)

* evm: protocol version

* changelog

* version

* fix

* support latest version only

x/evm/keeper/querier.go

@@ -10,11 +10,9 @@ import (
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
 	"github.com/cosmos/ethermint/utils"
-	"github.com/cosmos/ethermint/version"
 	"github.com/cosmos/ethermint/x/evm/types"
 
 	ethcmn "github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/hexutil"
 
 	abci "github.com/tendermint/tendermint/abci/types"
 )
@@ -23,8 +21,6 @@ import (
 func NewQuerier(keeper Keeper) sdk.Querier {
 	return func(ctx sdk.Context, path []string, _ abci.RequestQuery) ([]byte, error) {
 		switch path[0] {
-		case types.QueryProtocolVersion:
-			return queryProtocolVersion(keeper)
 		case types.QueryBalance:
 			return queryBalance(ctx, path, keeper)
 		case types.QueryBlockNumber:
@@ -51,17 +47,6 @@ func NewQuerier(keeper Keeper) sdk.Querier {
 	}
 }
 
-func queryProtocolVersion(keeper Keeper) ([]byte, error) {
-	vers := version.ProtocolVersion
-
-	bz, err := codec.MarshalJSONIndent(keeper.cdc, hexutil.Uint(vers))
-	if err != nil {
-		return nil, sdkerrors.Wrap(sdkerrors.ErrJSONMarshal, err.Error())
-	}
-
-	return bz, nil
-}
-
 func queryBalance(ctx sdk.Context, path []string, keeper Keeper) ([]byte, error) {
 	addr := ethcmn.HexToAddress(path[1])
 	balance := keeper.GetBalance(ctx, addr)

x/evm/keeper/querier_test.go

@@ -17,7 +17,6 @@ func (suite *KeeperTestSuite) TestQuerier() {
 		malleate func()
 		expPass  bool
 	}{
-		{"protocol version", []string{types.QueryProtocolVersion}, func() {}, true},
 		{"balance", []string{types.QueryBalance, addrHex}, func() {
 			suite.app.EvmKeeper.SetBalance(suite.ctx, suite.address, big.NewInt(5))
 		}, true},