Improve panic handling

main.go

@@ -18,12 +18,7 @@ import (
 var db *qbdb.DB
 
 func main() {
-	defer func() {
-		v := recover()
-		if v != nil {
-			flog.Critical(`panic: `, v)
-		}
-	}()
+	defer recoverFunc()
 	setLogger()
 
 	flog.Info(`Starting`)
@@ -31,41 +26,59 @@ func main() {
 
 	initDB()
 
-	start := GetStartDate()
 	for {
-		end := start.Add(time.Hour)
+		fetchData()
+	}
+}
 
-		data := GetFortopData(start, end)
-		ranges := map[string][]Range{}
-		for _, v := range data {
-			ranges[v.Naam] = v.Range
-		}
+func recoverFunc() {
+	v := recover()
+	if v != nil {
+		flog.Critical(`panic: `, v)
+	}
+}
 
-		sets := Sets{}
-		for k, v := range ranges {
-			for _, r := range v {
-				date := time.Time(r.Date)
-				set, ok := sets[date]
-				if !ok {
-					sets[date] = Set{}
-					set = sets[date]
-				}
+var start time.Time
 
-				set[k] = r.Value
-			}
-		}
-
-		insertSets(sets)
-
-		if end.Before(time.Now()) {
-			start = end.Add(time.Second)
-			continue
-		}
-
-		time.Sleep(time.Minute)
+func fetchData() {
+	defer recoverFunc()
 
+	if start.IsZero() {
 		start = GetStartDate()
 	}
+
+	end := start.Add(time.Hour)
+
+	data := GetFortopData(start, end)
+	ranges := map[string][]Range{}
+	for _, v := range data {
+		ranges[v.Naam] = v.Range
+	}
+
+	sets := Sets{}
+	for k, v := range ranges {
+		for _, r := range v {
+			date := time.Time(r.Date)
+			set, ok := sets[date]
+			if !ok {
+				sets[date] = Set{}
+				set = sets[date]
+			}
+
+			set[k] = r.Value
+		}
+	}
+
+	insertSets(sets)
+
+	if end.Before(time.Now()) {
+		start = end.Add(time.Second)
+		return
+	}
+
+	time.Sleep(time.Minute)
+
+	start = GetStartDate()
 }
 
 // GetStartDate gets the last measurement date
@@ -75,7 +88,7 @@ func GetStartDate() time.Time {
 
 	q := m.Select(qf.Max(m.Time))
 	err := db.QueryRow(q).Scan(&t)
-	if t == nil || err == sql.ErrNoRows {
+	if (err == nil && t == nil) || err == sql.ErrNoRows {
 		return time.Date(2018, 4, 1, 0, 0, 0, 0, time.Local)
 	}
 	if err != nil {