fix view function response (#20)

lib.go

@@ -66,15 +66,15 @@ func (vm *VM) ExecuteViewFunction(
 	env types.Env,
 	gasLimit uint64,
 	payload types.ViewFunction,
-) (string, error) {
+) (types.ViewOutput, error) {
 	envBz, err := env.BcsSerialize()
 	if err != nil {
-		return "", err
+		return types.ViewOutput{}, err
 	}
 
 	bz, err := payload.BcsSerialize()
 	if err != nil {
-		return "", err
+		return types.ViewOutput{}, err
 	}
 
 	res, err := api.ExecuteViewFunction(
@@ -86,10 +86,10 @@ func (vm *VM) ExecuteViewFunction(
 		bz,
 	)
 	if err != nil {
-		return "", err
+		return types.ViewOutput{}, err
 	}
 
-	return types.DeserializeString(res)
+	return types.BcsDeserializeViewOutput(res)
 }
 
 // Execute calls a given contract.

lib_test.go

@@ -362,7 +362,7 @@ func Test_QueryContract(t *testing.T) {
 		payload,
 	)
 	require.NoError(t, err)
-	require.Equal(t, fmt.Sprintf("\"%d\"", mintAmount), res)
+	require.Equal(t, fmt.Sprintf("\"%d\"", mintAmount), res.Ret)
 }
 
 func Test_DecodeResource(t *testing.T) {
@@ -590,5 +590,5 @@ func Test_OracleAPI(t *testing.T) {
 		payload,
 	)
 	require.NoError(t, err)
-	require.Equal(t, fmt.Sprintf("[\"%d\",\"%d\",\"%d\"]", price, updatedAt, decimals), res)
+	require.Equal(t, fmt.Sprintf("[\"%d\",\"%d\",\"%d\"]", price, updatedAt, decimals), res.Ret)
 }