feat(testdata): lots of work on new test data data source and scenarios

pkg/tsdb/testdata/testdata.go

@@ -1,17 +1,20 @@
 package testdata
 
 import (
-	"math/rand"
-
+	"github.com/grafana/grafana/pkg/log"
 	"github.com/grafana/grafana/pkg/tsdb"
 )
 
 type TestDataExecutor struct {
 	*tsdb.DataSourceInfo
+	log log.Logger
 }
 
 func NewTestDataExecutor(dsInfo *tsdb.DataSourceInfo) tsdb.Executor {
-	return &TestDataExecutor{dsInfo}
+	return &TestDataExecutor{
+		DataSourceInfo: dsInfo,
+		log:            log.New("tsdb.testdata"),
+	}
 }
 
 func init() {
@@ -22,33 +25,15 @@ func (e *TestDataExecutor) Execute(queries tsdb.QuerySlice, context *tsdb.QueryC
 	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
+		scenarioId := query.Model.Get("scenarioId").MustString("random_walk")
+		if scenario, exist := ScenarioRegistry[scenarioId]; exist {
+			result.QueryResults[query.RefId] = scenario.Handler(query, context)
+			result.QueryResults[query.RefId].RefId = query.RefId
+		} else {
+			e.log.Error("Scenario not found", "scenarioId", scenarioId)
 		}
-
-		series.Points = points
-		queryRes.Series = append(queryRes.Series, series)
 	}
 
-	result.QueryResults["A"] = queryRes
 	return result
 }