Lithium/controllers/controllers.go

package controllers

import (
	"encoding/json"
	"github.com/sirupsen/logrus"
	"net/http"
)

func writeError(w http.ResponseWriter, status int, errStr string) {
	w.WriteHeader(status)
	err := json.NewEncoder(w).Encode(struct {
		Error string `json:"error"`
	}{errStr})
	if err != nil {
		logrus.Fatal("Could not write JSON response: ", err)
	}
}