add calculate

http.go

@@ -303,6 +303,48 @@ func (web *WebServicer) GetTxsList(w http.ResponseWriter, r *http.Request) {
 
 }
 
+func (web *WebServicer) Calculate(w http.ResponseWriter, r *http.Request) {
+
+	requestAmountAsStr := r.URL.Query().Get("requestAmount")
+	currentAmountStr := r.URL.Query().Get("currentAmount")
+	everyTxAmountAsStr := r.URL.Query().Get("everyTxAmount")
+	txNumStr := r.URL.Query().Get("txNum")
+
+	requestAmountAsInt, err := strconv.ParseInt(requestAmountAsStr, 10, 64)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	currentAmount, err := strconv.ParseInt(currentAmountStr, 10, 64) //  strconv.Atoi(currentAmountStr)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	everyTxAmountAsInt, err := strconv.ParseInt(everyTxAmountAsStr, 10, 64) // strconv.Atoi(everyTxAmountAsStr)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	txNum, err := strconv.ParseInt(txNumStr, 10, 64) //strconv.Atoi(txNumStr)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	res := decimal.NewFromInt(requestAmountAsInt).Add(decimal.NewFromInt(currentAmount)).Sub(decimal.NewFromInt(everyTxAmountAsInt).Mul(decimal.NewFromInt(txNum)))
+
+	fmt.Printf("len(resAsJson): %v \n", res.String())
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(res.String()))
+
+}
+
 func (web *WebServicer) WebService(config Config) error {
 	r := mux.NewRouter()
 	// Routes consist of a path and a handler function.
@@ -312,6 +354,8 @@ func (web *WebServicer) WebService(config Config) error {
 	r.HandleFunc("/sender/tree/{uuid}", web.GetTreeHandler)
 	r.HandleFunc("/sender/txslist/{hash}", web.GetTxsList)
 	r.HandleFunc("/sender/txs", web.TxsHandler).Methods("POST")
+	r.HandleFunc("/sender/calculate", web.Calculate)
+
 	//r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir(config.WebStaticDir))))
 
 	clientFactory, exists := clientFactories["ethclient"]