Improved error handling in vchasno responses

api/fiscal.go

@@ -8,6 +8,15 @@ import (
 	"log"
 )
 
+type APIError struct {
+	Code    int
+	Message string
+}
+
+func (e *APIError) Error() string {
+	return fmt.Sprintf("vchasno api error %d: %s", e.Code, e.Message)
+}
+
 func (c *Client) executeRequest(ctx context.Context, request FiscalRequest, response interface{}) error {
 	request.Device = c.device
 
@@ -46,6 +55,16 @@ func (c *Client) executeRequest(ctx context.Context, request FiscalRequest, resp
 		return fmt.Errorf("failed to unmarshal response: %w, body: %s", err, string(body))
 	}
 
+	var baseResp BaseResponse
+	if err := json.Unmarshal(body, &baseResp); err == nil {
+		if baseResp.HasError() {
+			return &APIError{
+				Code:    baseResp.Res,
+				Message: baseResp.Errortxt,
+			}
+		}
+	}
+
 	return nil
 }
 

api/responses.go

@@ -15,6 +15,17 @@ type BaseResponse struct {
 	ErrorExtra interface{} `json:"error_extra"`
 }
 
+func (r *BaseResponse) HasError() bool {
+	return r.Res != 0
+}
+
+func (r *BaseResponse) Error() string {
+	if r.Errortxt != "" {
+		return r.Errortxt
+	}
+	return ""
+}
+
 type SellResponse struct {
 	BaseResponse
 	Info SellInfo `json:"info"`