Return results in a stable order

pkg/timeseries/sort.go

@@ -0,0 +1,33 @@
+package timeseries
+
+import (
+	"sort"
+)
+
+// SortBy sorts series by value calculated with provided aggFunc in given order
+func SortBy(series []*TimeSeriesData, order string, aggFunc AggFunc) []*TimeSeriesData {
+	aggregatedSeries := make([]TimeSeries, len(series))
+	for i, s := range series {
+		aggregatedSeries[i] = s.TS.GroupByRange(aggFunc)
+	}
+
+	// Sort by aggregated value
+	sort.Slice(series, func(i, j int) bool {
+		if len(aggregatedSeries[i]) > 0 && len(aggregatedSeries[j]) > 0 {
+			return *aggregatedSeries[i][0].Value < *aggregatedSeries[j][0].Value
+		} else if len(aggregatedSeries[j]) > 0 {
+			return true
+		}
+		return false
+	})
+
+	if order == "desc" {
+		reverseSeries := make([]*TimeSeriesData, len(series))
+		for i := 0; i < len(series); i++ {
+			reverseSeries[i] = series[len(series)-1-i]
+		}
+		series = reverseSeries
+	}
+
+	return series
+}