feat: Added uptime calculation method

model/service.go

@@ -1,5 +1,7 @@
 package model
 
+import "math"
+
 type HTTPConfig struct {
 	Method  string            `json:"method"`
 	Headers map[string]string `json:"headers"`
@@ -45,3 +47,29 @@ func (s Service) CountLastStatuses(status StatusCode) uint {
 
 	return count
 }
+
+func (s Service) CalculateUptimePercent() float64 {
+	var uptime float64
+
+	if len(s.Statuses) == 0 {
+		return uptime
+	}
+
+	var countOfOkStatus int
+
+	for i := range s.Statuses {
+		if s.Statuses[i].Status == StatusOK {
+			countOfOkStatus++
+		}
+	}
+
+	if countOfOkStatus == 0 {
+		return uptime
+	}
+
+	sla := 100 - (float64(len(s.Statuses)) / float64(countOfOkStatus))
+	ratio := math.Pow(10, float64(2))
+	uptime = math.Round(sla*ratio) / ratio
+
+	return uptime
+}