Configurable interval for nodata checks

config.go

@@ -1,5 +1,6 @@
 package main
 
 type SmonConfiguration struct {
-	LogFile string
+	LogFile        string
+	NodataInterval int `json:"nodata_interval"` // in seconds
 }

main.go

@@ -38,6 +38,7 @@ var (
 	parsedTemplates     map[string]*template.Template
 	componentFilenames  []string
 	notificationManager notification.Manager
+	smonConf            SmonConfiguration
 
 	//go:embed sql
 	sqlFS embed.FS
@@ -88,7 +89,6 @@ func main() { // {{{
 		os.Exit(1)
 	}
 
-	smonConf := SmonConfiguration{}
 	j, _ := json.Marshal(service.Config.Application)
 	json.Unmarshal(j, &smonConf)
 	logFile, err = os.OpenFile(smonConf.LogFile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
@@ -96,6 +96,10 @@ func main() { // {{{
 		logger.Error("application", "error", err)
 		return
 	}
+	if smonConf.NodataInterval < 10 {
+		logger.Error("application → nodata_interval has to be larger or equal to 10.")
+		return
+	}
 
 	service.SetDatabase(sqlProvider)
 	service.SetStaticFS(staticFS, "static")

nodata.go

@@ -25,7 +25,7 @@ func nodataLoop() {
 	var err error
 
 	// TODO - should be configurable
-	ticker := time.NewTicker(time.Second * 5)
+	ticker := time.NewTicker(time.Second * time.Duration(smonConf.NodataInterval))
 	for {
 		<-ticker.C
 		datapoints, err = nodataDatapoints()