Problem: performance regression because of un-cached sender recovery (e…

…vmos#350)

Solution:
- re-order ante handlers, use cached from address

app/ante/handler_options.go

@@ -74,6 +74,7 @@ func newEthAnteHandler(options HandlerOptions) sdk.AnteHandler {
 		NewEthValidateBasicDecorator(options.EvmKeeper),
 		NewEthSigVerificationDecorator(options.EvmKeeper),
 		NewEthAccountVerificationDecorator(options.AccountKeeper, options.EvmKeeper),
+		extra,
 		NewCanTransferDecorator(options.EvmKeeper),
 		NewEthGasConsumeDecorator(options.EvmKeeper, options.MaxTxGasWanted),
 		NewEthIncrementSenderSequenceDecorator(options.AccountKeeper), // innermost AnteDecorator.
@@ -100,6 +101,7 @@ func newCosmosAnteHandler(options HandlerOptions) sdk.AnteHandler {
 		ante.NewValidateSigCountDecorator(options.AccountKeeper),
 		ante.NewSigGasConsumeDecorator(options.AccountKeeper, options.SigGasConsumer),
 		ante.NewSigVerificationDecorator(options.AccountKeeper, options.SignModeHandler),
+		extra,
 		ante.NewIncrementSequenceDecorator(options.AccountKeeper),
 		ibcante.NewRedundantRelayDecorator(options.IBCKeeper),
 		NewGasWantedDecorator(options.EvmKeeper, options.FeeMarketKeeper),

x/evm/types/msg.go

@@ -225,6 +225,10 @@ func (msg *MsgEthereumTx) GetMsgs() []sdk.Msg {
 //
 // NOTE: This method panics if 'Sign' hasn't been called first.
 func (msg *MsgEthereumTx) GetSigners() []sdk.AccAddress {
+	if len(msg.From) > 0 {
+		return []sdk.AccAddress{common.HexToAddress(msg.From).Bytes()}
+	}
+
 	data, err := UnpackTxData(msg.Data)
 	if err != nil {
 		panic(err)