[PDR-13372][fix(panic)]修复获取文件真实路径报空指针异常问题

Author: PapaPiya

reader/tailx/tailx.go

@@ -650,6 +650,11 @@ func (r *Reader) checkExpiredFiles() {
 }
 
 func (r *Reader) statLogPath() {
+	defer func() {
+		if rec := recover(); rec != nil {
+			log.Errorf("Reader %q was panicked and recovered from %v\nstack: %s", r.Name(), rec, debug.Stack())
+		}
+	}()
 	//达到最大打开文件数，不再追踪
 	if len(r.fileReaders) >= r.maxOpenFiles {
 		if !IsSelfRunner(r.meta.RunnerName) {

utils/models/utils.go

@@ -703,6 +703,9 @@ func GetRealPath(path string) (newPath string, fi os.FileInfo, err error) {
 		}
 		log.Infof("%s is symbol link to %v", path, newPath)
 		fi, err = os.Lstat(newPath)
+		if err != nil {
+			return
+		}
 	}
 	newPath, err = filepath.Abs(newPath)
 	if err != nil {