Pass gas consumed back in result struct

baseapp/baseapp.go

@@ -322,6 +322,7 @@ func (app *BaseApp) CheckTx(txBytes []byte) (res abci.ResponseCheckTx) {
 		Data:      result.Data,
 		Log:       result.Log,
 		GasWanted: result.GasWanted,
+		GasUsed:   result.GasUsed,
 		Fee: cmn.KI64Pair{
 			[]byte(result.FeeDenom),
 			result.FeeAmount,
@@ -433,6 +434,9 @@ func (app *BaseApp) runTx(isCheckTx bool, txBytes []byte, tx sdk.Tx) (result sdk
 
 	result = handler(ctx, msg)
 
+	// Set gas utilized
+	result.GasUsed = ctx.GasMeter().GasConsumed()
+
 	// If result was successful, write to app.checkState.ms or app.deliverState.ms
 	if result.IsOK() {
 		msCache.Write()

types/gas.go

@@ -2,10 +2,11 @@ package types
 
 import ()
 
-type Gas uint64
+type Gas = int64
 
 type GasMeter interface {
 	GasExceeded() bool
+	GasConsumed() Gas
 	ConsumeGas(amount Gas)
 	ConsumeGasOrFail(amount Gas) bool
 }
@@ -26,6 +27,10 @@ func (g *basicGasMeter) GasExceeded() bool {
 	return g.consumed > g.limit
 }
 
+func (g *basicGasMeter) GasConsumed() Gas {
+	return g.consumed
+}
+
 func (g *basicGasMeter) ConsumeGas(amount Gas) {
 	g.consumed += amount
 }