Fix clear logs job (#2090)

web/job/clear_logs_job.go

@@ -19,29 +19,22 @@ func (j *ClearLogsJob) Run() {
 	logFiles := []string{xray.GetIPLimitLogPath(), xray.GetIPLimitBannedLogPath(), xray.GetAccessPersistentLogPath()}
 	logFilesPrev := []string{xray.GetIPLimitBannedPrevLogPath(), xray.GetAccessPersistentPrevLogPath()}
 
-	// clear old previous logs
-	for i := 0; i < len(logFilesPrev); i++ {
-		if err := os.Truncate(logFilesPrev[i], 0); err != nil {
-			logger.Warning("clear logs job err:", err)
-		}
-	}
-
 	// clear log files and copy to previous logs
 	for i := 0; i < len(logFiles); i++ {
 		if i > 0 {
 			// copy to previous logs
-			logFilePrev, err := os.OpenFile(logFilesPrev[i-1], os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
+			logFilePrev, err := os.OpenFile(logFilesPrev[i-1], os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
 			if err != nil {
 				logger.Warning("clear logs job err:", err)
 			}
 
-			logFile, err := os.Open(logFiles[i])
-			if err != nil {
-				logger.Warning("clear logs job err:", err)
-			}
-
-			_, err = io.Copy(logFilePrev, logFile)
-			if err != nil {
+			logFile, err :=  os.OpenFile(logFiles[i], os.O_CREATE|os.O_RDONLY, 0644)
+			if err == nil {
+				_, err = io.Copy(logFilePrev, logFile)
+				if err != nil {
+					logger.Warning("clear logs job err:", err)
+				}
+			} else {
 				logger.Warning("clear logs job err:", err)
 			}