WIP: Spawn backend plugins v2 (#19835)

* WIP: Spawn backend plugins v2

* Add test for plugin version

* Fix support for SDK plugins

Co-authored-by: Kyle Brandt <kyle@kbrandt.com>
Co-authored-by: Marcus Olsson <olsson.e.marcus@gmail.com>
Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* WIP: Draft PR for fork of V2 sdk / bi-directional support (#19890)

* temporary use export-datasource-plugin branch of grafana-plugin-sdk

* fix failing test

* remove debug (spew) lines

* misc cleanup

* add expressions feature toggle

* use latest grafana-plugin-sdk-go

pkg/tsdb/frame_util.go

@@ -0,0 +1,37 @@
+package tsdb
+
+import (
+	"time"
+
+	"github.com/grafana/grafana-plugin-sdk-go/dataframe"
+)
+
+// SeriesToFrame converts a TimeSeries to a sdk Frame
+func SeriesToFrame(series *TimeSeries) (*dataframe.Frame, error) {
+	timeVec := make([]*time.Time, len(series.Points))
+	floatVec := make([]*float64, len(series.Points))
+	for idx, point := range series.Points {
+		timeVec[idx], floatVec[idx] = convertTSDBTimePoint(point)
+	}
+	frame := dataframe.New(series.Name, dataframe.Labels(series.Tags),
+		dataframe.NewField("time", dataframe.FieldTypeTime, timeVec),
+		dataframe.NewField("value", dataframe.FieldTypeNumber, floatVec),
+	)
+
+	return frame, nil
+}
+
+// convertTSDBTimePoint coverts a tsdb.TimePoint into two values appropriate
+// for Series values.
+func convertTSDBTimePoint(point TimePoint) (t *time.Time, f *float64) {
+	timeIdx, valueIdx := 1, 0
+	if point[timeIdx].Valid { // Assuming valid is null?
+		tI := int64(point[timeIdx].Float64)
+		uT := time.Unix(tI/int64(1e+3), (tI%int64(1e+3))*int64(1e+6)) // time.Time from millisecond unix ts
+		t = &uT
+	}
+	if point[valueIdx].Valid {
+		f = &point[valueIdx].Float64
+	}
+	return
+}

pkg/tsdb/models.go

@@ -32,6 +32,7 @@ type QueryResult struct {
 	Meta        *simplejson.Json `json:"meta,omitempty"`
 	Series      TimeSeriesSlice  `json:"series"`
 	Tables      []*Table         `json:"tables"`
+	Dataframes  [][]byte         `json:"dataframes"`
 }
 
 type TimeSeries struct {