1 files changed, 24 insertions, 0 deletions
diff --git a/service_report.go b/service_report.go
index 2627bc2..291cd2b 100644
--- a/service_report.go
+++ b/service_report.go
@@ -3,9 +3,33 @@
 
 package lilin
 
+// historyKeepSize maximum report to keep in history.
+const historyKeepSize = 120
+
+// historyMax limit of history before its being purged to historyKeepSize.
+const historyMax = historyKeepSize * 2
+
 // ServiceReport contains the scan report for single service.
 type ServiceReport struct {
 	Name    string
 	Last    ScanReport
 	History []ScanReport
 }
+
+func NewServiceReport(name string) (svcReport *ServiceReport) {
+	svcReport = &ServiceReport{
+		Name:    name,
+		History: make([]ScanReport, 0, historyMax),
+	}
+	return svcReport
+}
+
+func (svcReport *ServiceReport) Store(scanReport ScanReport) {
+	svcReport.Last = scanReport
+	svcReport.History = append(svcReport.History, scanReport)
+	if len(svcReport.History) == historyMax {
+		var start = len(svcReport.History) - historyKeepSize
+		copy(svcReport.History, svcReport.History[start:])
+		svcReport.History = svcReport.History[:historyKeepSize-1]
+	}
+}