Create response.go

response.go

@@ -0,0 +1,59 @@
+// This package parse a http request from datatables (jQuery plugin) to a friendly structure
+// More details in https://github.com/saulortega/datatables
+// import "github.com/saulortega/datatables"
+
+package datatables
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+)
+
+type Response struct {
+	Draw            int         `json:"draw"`
+	RecordsTotal    int         `json:"recordsTotal"`
+	RecordsFiltered int         `json:"recordsFiltered"`
+	Data            interface{} `json:"data"`
+	Error           error       `json:"error,omitempty"`
+}
+
+func (r *Response) Check() error {
+	var err error
+
+	if r.Data == nil || r.RecordsFiltered == 0 {
+		r.Data = []string{} //Vacío, no nulo
+	}
+
+	if r.RecordsFiltered > r.RecordsTotal {
+		err = errors.New("wrong filtered or total records")
+	}
+
+	return err
+}
+
+func (r *Response) WriteResponseOnSuccess(w http.ResponseWriter) error {
+	err := r.Check()
+	if err != nil {
+		return err
+	}
+
+	RJSON, err := json.Marshal(r)
+	if err != nil {
+		return err
+	}
+
+	w.WriteHeader(http.StatusOK)
+	w.Write(RJSON)
+
+	return nil
+}
+
+func (r *Response) WriteResponse(w http.ResponseWriter) error {
+	err := r.WriteResponseOnSuccess(w)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+
+	return err
+}