admin: Add Background heal status info API (#7774)

This API returns the information related to the self healing routine.

For the moment, it returns:
- The total number of objects that are scanned
- The last time when an item was scanned

cmd/peer-rest-server.go

@@ -709,6 +709,20 @@ func (s *peerRESTServer) TraceHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (s *peerRESTServer) BackgroundHealStatusHandler(w http.ResponseWriter, r *http.Request) {
+	if !s.IsValid(w, r) {
+		s.writeErrorResponse(w, errors.New("invalid request"))
+		return
+	}
+
+	ctx := newContext(r, w, "BackgroundHealStatus")
+
+	state := getLocalBackgroundHealStatus()
+
+	defer w.(http.Flusher).Flush()
+	logger.LogIf(ctx, gob.NewEncoder(w).Encode(state))
+}
+
 func (s *peerRESTServer) writeErrorResponse(w http.ResponseWriter, err error) {
 	w.WriteHeader(http.StatusForbidden)
 	w.Write([]byte(err.Error()))
@@ -755,6 +769,7 @@ func registerPeerRESTHandlers(router *mux.Router) {
 	subrouter.Methods(http.MethodPost).Path("/" + peerRESTMethodReloadFormat).HandlerFunc(httpTraceHdrs(server.ReloadFormatHandler)).Queries(restQueries(peerRESTDryRun)...)
 
 	subrouter.Methods(http.MethodPost).Path("/" + peerRESTMethodTrace).HandlerFunc(server.TraceHandler)
+	subrouter.Methods(http.MethodPost).Path("/" + peerRESTMethodBackgroundHealStatus).HandlerFunc(server.BackgroundHealStatusHandler)
 
 	router.NotFoundHandler = http.HandlerFunc(httpTraceAll(notFoundHandler))
 }