Split new and update-transaction into separate methods

server/transaction.go

@@ -27,7 +27,7 @@ type NewTransactionPayload struct {
 	State      string        `json:"state"`
 }
 
-func (h *Handler) newTransaction(c *gin.Context) {
+func (h *Handler) updateTransaction(c *gin.Context) {
 	var payload NewTransactionPayload
 	err := c.BindJSON(&payload)
 	if err != nil {
@@ -42,8 +42,26 @@ func (h *Handler) newTransaction(c *gin.Context) {
 	}
 
 	transactionID := c.Param("transactionid")
-	if transactionID != "" {
-		h.UpdateTransaction(payload, amount, transactionID, c)
+	transactionUUID, err := uuid.Parse(transactionID)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusBadRequest, ErrorResponse{"transactionid missing from URL"})
+		return
+	}
+
+	h.UpdateTransaction(payload, amount, transactionUUID, c)
+}
+
+func (h *Handler) newTransaction(c *gin.Context) {
+	var payload NewTransactionPayload
+	err := c.BindJSON(&payload)
+	if err != nil {
+		c.AbortWithError(http.StatusBadRequest, err)
+		return
+	}
+
+	amount, err := numeric.Parse(payload.Amount)
+	if err != nil {
+		c.AbortWithError(http.StatusBadRequest, fmt.Errorf("amount: %w", err))
 		return
 	}
 
@@ -87,8 +105,7 @@ func (h *Handler) newTransaction(c *gin.Context) {
 	c.JSON(http.StatusOK, transaction)
 }
 
-func (h *Handler) UpdateTransaction(payload NewTransactionPayload, amount numeric.Numeric, transactionID string, c *gin.Context) {
-	transactionUUID := uuid.MustParse(transactionID)
+func (h *Handler) UpdateTransaction(payload NewTransactionPayload, amount numeric.Numeric, transactionUUID uuid.UUID, c *gin.Context) {
 	if amount.IsZero() {
 		err := h.Service.DeleteTransaction(c.Request.Context(), transactionUUID)
 		if err != nil {