Use time series format internally

pkg/datasource/response_handler.go

@@ -5,12 +5,85 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/alexanderzobnin/grafana-zabbix/pkg/timeseries"
 	"github.com/alexanderzobnin/grafana-zabbix/pkg/zabbix"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 )
 
-func convertHistoryToDataFrame(history zabbix.History, items zabbix.Items) *data.Frame {
+func convertHistoryToTimeSeries(history zabbix.History, items []*zabbix.Item) []*timeseries.TimeSeriesData {
+	seriesMap := make(map[string]*timeseries.TimeSeriesData, len(items))
+
+	itemsMap := make(map[string]*zabbix.Item, len(items))
+	for _, item := range items {
+		itemsMap[item.ID] = item
+	}
+
+	for _, point := range history {
+		pointItem := itemsMap[point.ItemID]
+		if seriesMap[point.ItemID] == nil {
+			seriesMap[point.ItemID] = timeseries.NewTimeSeriesData()
+		}
+		pointSeries := seriesMap[point.ItemID]
+		if pointSeries.Meta.Item == nil {
+			pointSeries.Meta.Item = pointItem
+		}
+
+		value := point.Value
+		pointSeries.Add(timeseries.TimePoint{
+			Time:  time.Unix(point.Clock, point.NS),
+			Value: &value,
+		})
+	}
+
+	series := make([]*timeseries.TimeSeriesData, 0)
+	for _, tsd := range seriesMap {
+		series = append(series, tsd)
+	}
+
+	return series
+}
+
+func convertTimeSeriesToDataFrame(series []*timeseries.TimeSeriesData) *data.Frame {
+	timeFileld := data.NewFieldFromFieldType(data.FieldTypeTime, 0)
+	timeFileld.Name = "time"
+	frame := data.NewFrame("History", timeFileld)
+
+	for _, s := range series {
+		field := data.NewFieldFromFieldType(data.FieldTypeNullableFloat64, 0)
+		item := s.Meta.Item
+		if len(item.Hosts) > 0 {
+			field.Name = fmt.Sprintf("%s: %s", item.Hosts[0].Name, item.ExpandItemName())
+		} else {
+			field.Name = item.ExpandItemName()
+		}
+
+		frame.Fields = append(frame.Fields, field)
+	}
+
+	for i, s := range series {
+		currentFieldIndex := i + 1
+		for _, point := range s.TS {
+			timeFileld.Append(point.Time)
+			for fieldIndex, field := range frame.Fields {
+				if fieldIndex == currentFieldIndex {
+					field.Append(point.Value)
+				} else if fieldIndex > 0 {
+					field.Append(nil)
+				}
+			}
+		}
+	}
+
+	wideFrame, err := data.LongToWide(frame, &data.FillMissing{Mode: data.FillModeNull})
+	if err != nil {
+		backend.Logger.Debug("Error converting data frame to the wide format", "error", err)
+		return frame
+	}
+	return wideFrame
+}
+
+func convertHistoryToDataFrame(history zabbix.History, items []*zabbix.Item) *data.Frame {
 	timeFileld := data.NewFieldFromFieldType(data.FieldTypeTime, 0)
 	timeFileld.Name = "time"
 	frame := data.NewFrame("History", timeFileld)