fix nil map error

fix #67

handler.go

@@ -185,7 +185,7 @@ func (cr *Cluster) getRecordMiddleWare() utils.MiddleWareFunc {
 		used    float64
 		bytes   float64
 		ua      string
-		isRange bool
+		skipUA bool
 	}
 	recordCh := make(chan record, 1024)
 
@@ -228,7 +228,7 @@ func (cr *Cluster) getRecordMiddleWare() utils.MiddleWareFunc {
 				total++
 				totalUsed += rec.used
 				totalBytes += rec.bytes
-				if !rec.isRange {
+				if !rec.skipUA {
 					uas[rec.ua]++
 				}
 			case <-disabled:
@@ -306,7 +306,7 @@ func (cr *Cluster) getRecordMiddleWare() utils.MiddleWareFunc {
 		rec.bytes = (float64)(srw.Wrote)
 		ua, _, _ = strings.Cut(ua, " ")
 		rec.ua, _, _ = strings.Cut(ua, "/")
-		rec.isRange = extraInfoMap["skip-ua-count"] != nil
+		rec.skipUA = extraInfoMap["skip-ua-count"] != nil
 		select {
 		case recordCh <- rec:
 		default:

notify/stat.go

@@ -272,6 +272,7 @@ func (s *Stats) Load(dir string) (err error) {
 	if err = s.StatData.load(filepath.Join(dir, statsFileName)); err != nil {
 		return
 	}
+	s.subStat = make(map[string]*StatData)
 
 	if entries, err := os.ReadDir(filepath.Join(dir, statsDirName)); err == nil {
 		for _, entry := range entries {
@@ -336,6 +337,9 @@ func (s *Stats) AddHits(hits int32, bytes int64, name string) {
 			ss = new(StatData)
 			ss.Years = make(map[string]statInstData, 2)
 			ss.Accesses = make(map[string]int, 5)
+			if s.subStat == nil {
+				s.subStat = make(map[string]*StatData)
+			}
 			s.subStat[name] = ss
 		}
 		ss.update(data)