feat(testdata): worked on testdata app

pkg/tsdb/testdata/testdata.go

@@ -0,0 +1,54 @@
+package testdata
+
+import (
+	"math/rand"
+
+	"github.com/grafana/grafana/pkg/tsdb"
+)
+
+type TestDataExecutor struct {
+	*tsdb.DataSourceInfo
+}
+
+func NewTestDataExecutor(dsInfo *tsdb.DataSourceInfo) tsdb.Executor {
+	return &TestDataExecutor{dsInfo}
+}
+
+func init() {
+	tsdb.RegisterExecutor("grafana-testdata-datasource", NewTestDataExecutor)
+}
+
+func (e *TestDataExecutor) Execute(queries tsdb.QuerySlice, context *tsdb.QueryContext) *tsdb.BatchResult {
+	result := &tsdb.BatchResult{}
+	result.QueryResults = make(map[string]*tsdb.QueryResult)
+
+	from, _ := context.TimeRange.FromTime()
+	to, _ := context.TimeRange.ToTime()
+
+	queryRes := &tsdb.QueryResult{}
+
+	for _, query := range queries {
+		// scenario := query.Model.Get("scenario").MustString("random_walk")
+		series := &tsdb.TimeSeries{Name: "test-series-0"}
+
+		stepInSeconds := (to.Unix() - from.Unix()) / query.MaxDataPoints
+		points := make([][2]*float64, 0)
+		walker := rand.Float64() * 100
+		time := from.Unix()
+
+		for i := int64(0); i < query.MaxDataPoints; i++ {
+			timestamp := float64(time)
+			val := float64(walker)
+			points = append(points, [2]*float64{&val, &timestamp})
+
+			walker += rand.Float64() - 0.5
+			time += stepInSeconds
+		}
+
+		series.Points = points
+		queryRes.Series = append(queryRes.Series, series)
+	}
+
+	result.QueryResults["A"] = queryRes
+	return result
+}