follow go idiom and return error as second param

pkg/api/metrics.go

@@ -43,7 +43,7 @@ func QueryMetrics(c *middleware.Context, reqDto dtos.MetricRequest) Response {
 		})
 	}
 
-	resp, err := tsdb.HandleRequest(context.Background(), request)
+	resp, err := tsdb.HandleRequest(context.Background(), dsQuery.Result, request)
 	if err != nil {
 		return ApiError(500, "Metric request error", err)
 	}
@@ -100,16 +100,17 @@ func GetTestDataRandomWalk(c *middleware.Context) Response {
 	timeRange := tsdb.NewTimeRange(from, to)
 	request := &tsdb.TsdbQuery{TimeRange: timeRange}
 
+	dsInfo := &models.DataSource{Type: "grafana-testdata-datasource"}
 	request.Queries = append(request.Queries, &tsdb.Query{
 		RefId:      "A",
 		IntervalMs: intervalMs,
 		Model: simplejson.NewFromAny(&util.DynMap{
 			"scenario": "random_walk",
 		}),
-		DataSource: &models.DataSource{Type: "grafana-testdata-datasource"},
+		DataSource: dsInfo,
 	})
 
-	resp, err := tsdb.HandleRequest(context.Background(), request)
+	resp, err := tsdb.HandleRequest(context.Background(), dsInfo, request)
 	if err != nil {
 		return ApiError(500, "Metric request error", err)
 	}

pkg/services/alerting/conditions/query.go

@@ -112,7 +112,7 @@ func (c *QueryCondition) executeQuery(context *alerting.EvalContext, timeRange *
 	req := c.getRequestForAlertRule(getDsInfo.Result, timeRange)
 	result := make(tsdb.TimeSeriesSlice, 0)
 
-	resp, err := c.HandleRequest(context.Ctx, req)
+	resp, err := c.HandleRequest(context.Ctx, getDsInfo.Result, req)
 	if err != nil {
 		if err == gocontext.DeadlineExceeded {
 			return nil, fmt.Errorf("Alert execution exceeded the timeout")

pkg/services/alerting/conditions/query_test.go

@@ -168,7 +168,7 @@ func (ctx *queryConditionTestContext) exec() (*alerting.ConditionResult, error)
 
 	ctx.condition = condition
 
-	condition.HandleRequest = func(context context.Context, req *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	condition.HandleRequest = func(context context.Context, dsInfo *m.DataSource, req *tsdb.TsdbQuery) (*tsdb.Response, error) {
 		return &tsdb.Response{
 			Results: map[string]*tsdb.QueryResult{
 				"A": {Series: ctx.series},

pkg/tsdb/fake_test.go

@@ -20,18 +20,18 @@ func NewFakeExecutor(dsInfo *models.DataSource) (*FakeExecutor, error) {
 	}, nil
 }
 
-func (e *FakeExecutor) Query(ctx context.Context, dsInfo *models.DataSource, context *TsdbQuery) *BatchResult {
-	result := &BatchResult{QueryResults: make(map[string]*QueryResult)}
+func (e *FakeExecutor) Query(ctx context.Context, dsInfo *models.DataSource, context *TsdbQuery) (*Response, error) {
+	result := &Response{Results: make(map[string]*QueryResult)}
 	for _, query := range context.Queries {
 		if results, has := e.results[query.RefId]; has {
-			result.QueryResults[query.RefId] = results
+			result.Results[query.RefId] = results
 		}
 		if testFunc, has := e.resultsFn[query.RefId]; has {
-			result.QueryResults[query.RefId] = testFunc(context)
+			result.Results[query.RefId] = testFunc(context)
 		}
 	}
 
-	return result
+	return result, nil
 }
 
 func (e *FakeExecutor) Return(refId string, series TimeSeriesSlice) {

pkg/tsdb/graphite/graphite.go

@@ -37,8 +37,8 @@ func init() {
 	tsdb.RegisterTsdbQueryEndpoint("graphite", NewGraphiteExecutor)
 }
 
-func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{}
+func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
 
 	from := "-" + formatTimeRange(tsdbQuery.TimeRange.From)
 	until := formatTimeRange(tsdbQuery.TimeRange.To)
@@ -67,14 +67,12 @@ func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 
 	req, err := e.createRequest(dsInfo, formData)
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	httpClient, err := dsInfo.GetHttpClient()
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	span, ctx := opentracing.StartSpanFromContext(ctx, "graphite query")
@@ -90,17 +88,15 @@ func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 
 	res, err := ctxhttp.Do(ctx, httpClient, req)
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	data, err := e.parseResponse(res)
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
-	result.QueryResults = make(map[string]*tsdb.QueryResult)
+	result.Results = make(map[string]*tsdb.QueryResult)
 	queryRes := tsdb.NewQueryResult()
 
 	for _, series := range data {
@@ -114,8 +110,8 @@ func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 		}
 	}
 
-	result.QueryResults["A"] = queryRes
-	return result
+	result.Results["A"] = queryRes
+	return result, nil
 }
 
 func (e *GraphiteExecutor) parseResponse(res *http.Response) ([]TargetResponseDTO, error) {

pkg/tsdb/influxdb/influxdb.go

@@ -39,17 +39,17 @@ func init() {
 	tsdb.RegisterTsdbQueryEndpoint("influxdb", NewInfluxDBExecutor)
 }
 
-func (e *InfluxDBExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{}
+func (e *InfluxDBExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
 
 	query, err := e.getQuery(dsInfo, tsdbQuery.Queries, tsdbQuery)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	rawQuery, err := query.Build(tsdbQuery)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	if setting.Env == setting.DEV {
@@ -58,21 +58,21 @@ func (e *InfluxDBExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 
 	req, err := e.createRequest(dsInfo, rawQuery)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	httpClient, err := dsInfo.GetHttpClient()
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	resp, err := ctxhttp.Do(ctx, httpClient, req)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	if resp.StatusCode/100 != 2 {
-		return result.WithError(fmt.Errorf("Influxdb returned statuscode invalid status code: %v", resp.Status))
+		return nil, fmt.Errorf("Influxdb returned statuscode invalid status code: %v", resp.Status)
 	}
 
 	var response Response
@@ -82,17 +82,17 @@ func (e *InfluxDBExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 	err = dec.Decode(&response)
 
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	if response.Err != nil {
-		return result.WithError(response.Err)
+		return nil, response.Err
 	}
 
-	result.QueryResults = make(map[string]*tsdb.QueryResult)
-	result.QueryResults["A"] = e.ResponseParser.Parse(&response, query)
+	result.Results = make(map[string]*tsdb.QueryResult)
+	result.Results["A"] = e.ResponseParser.Parse(&response, query)
 
-	return result
+	return result, nil
 }
 
 func (e *InfluxDBExecutor) getQuery(dsInfo *models.DataSource, queries []*tsdb.Query, context *tsdb.TsdbQuery) (*Query, error) {

pkg/tsdb/models.go

@@ -22,24 +22,8 @@ type Query struct {
 }
 
 type Response struct {
-	BatchTimings []*BatchTiming          `json:"timings"`
-	Results      map[string]*QueryResult `json:"results"`
-	Message      string                  `json:"message,omitempty"`
-}
-
-type BatchTiming struct {
-	TimeElapsed int64
-}
-
-type BatchResult struct {
-	Error        error
-	QueryResults map[string]*QueryResult
-	Timings      *BatchTiming
-}
-
-func (br *BatchResult) WithError(err error) *BatchResult {
-	br.Error = err
-	return br
+	Results map[string]*QueryResult `json:"results"`
+	Message string                  `json:"message,omitempty"`
 }
 
 type QueryResult struct {

pkg/tsdb/mysql/mysql.go

@@ -85,9 +85,9 @@ func (e *MysqlExecutor) initEngine(dsInfo *models.DataSource) error {
 	return nil
 }
 
-func (e *MysqlExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{
-		QueryResults: make(map[string]*tsdb.QueryResult),
+func (e *MysqlExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{
+		Results: make(map[string]*tsdb.QueryResult),
 	}
 
 	macroEngine := NewMysqlMacroEngine(tsdbQuery.TimeRange)
@@ -102,7 +102,7 @@ func (e *MysqlExecutor) Query(ctx context.Context, dsInfo *models.DataSource, ts
 		}
 
 		queryResult := &tsdb.QueryResult{Meta: simplejson.New(), RefId: query.RefId}
-		result.QueryResults[query.RefId] = queryResult
+		result.Results[query.RefId] = queryResult
 
 		rawSql, err := macroEngine.Interpolate(rawSql)
 		if err != nil {
@@ -138,7 +138,7 @@ func (e *MysqlExecutor) Query(ctx context.Context, dsInfo *models.DataSource, ts
 		}
 	}
 
-	return result
+	return result, nil
 }
 
 func (e MysqlExecutor) TransformToTable(query *tsdb.Query, rows *core.Rows, result *tsdb.QueryResult) error {

pkg/tsdb/opentsdb/opentsdb.go

@@ -50,8 +50,8 @@ func init() {
 	tsdb.RegisterTsdbQueryEndpoint("opentsdb", NewOpenTsdbExecutor)
 }
 
-func (e *OpenTsdbExecutor) Query(ctx context.Context, dsInfo *models.DataSource, queryContext *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{}
+func (e *OpenTsdbExecutor) Query(ctx context.Context, dsInfo *models.DataSource, queryContext *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
 
 	var tsdbQuery OpenTsdbQuery
 
@@ -69,29 +69,26 @@ func (e *OpenTsdbExecutor) Query(ctx context.Context, dsInfo *models.DataSource,
 
 	req, err := e.createRequest(dsInfo, tsdbQuery)
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	httpClient, err := dsInfo.GetHttpClient()
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	res, err := ctxhttp.Do(ctx, httpClient, req)
 	if err != nil {
-		result.Error = err
-		return result
+		return nil, err
 	}
 
 	queryResult, err := e.parseResponse(tsdbQuery, res)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
-	result.QueryResults = queryResult
-	return result
+	result.Results = queryResult
+	return result, nil
 }
 
 func (e *OpenTsdbExecutor) createRequest(dsInfo *models.DataSource, data OpenTsdbQuery) (*http.Request, error) {

pkg/tsdb/prometheus/prometheus.go

@@ -80,17 +80,17 @@ func (e *PrometheusExecutor) getClient(dsInfo *models.DataSource) (apiv1.API, er
 	return apiv1.NewAPI(client), nil
 }
 
-func (e *PrometheusExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{}
+func (e *PrometheusExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
 
 	client, err := e.getClient(dsInfo)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	query, err := parseQuery(tsdbQuery.Queries, tsdbQuery)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	timeRange := apiv1.Range{
@@ -108,15 +108,15 @@ func (e *PrometheusExecutor) Query(ctx context.Context, dsInfo *models.DataSourc
 	value, err := client.QueryRange(ctx, query.Expr, timeRange)
 
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
 
 	queryResult, err := parseResponse(value, query)
 	if err != nil {
-		return result.WithError(err)
+		return nil, err
 	}
-	result.QueryResults = queryResult
-	return result
+	result.Results = queryResult
+	return result, nil
 }
 
 func formatLegend(metric model.Metric, query *PrometheusQuery) string {

pkg/tsdb/query_endpoint.go

@@ -8,7 +8,7 @@ import (
 )
 
 type TsdbQueryEndpoint interface {
-	Query(ctx context.Context, ds *models.DataSource, query *TsdbQuery) *BatchResult
+	Query(ctx context.Context, ds *models.DataSource, query *TsdbQuery) (*Response, error)
 }
 
 var registry map[string]GetTsdbQueryEndpointFn

pkg/tsdb/request.go

@@ -2,25 +2,17 @@ package tsdb
 
 import (
 	"context"
+
+	"github.com/grafana/grafana/pkg/models"
 )
 
-type HandleRequestFunc func(ctx context.Context, req *TsdbQuery) (*Response, error)
+type HandleRequestFunc func(ctx context.Context, dsInfo *models.DataSource, req *TsdbQuery) (*Response, error)
 
-func HandleRequest(ctx context.Context, req *TsdbQuery) (*Response, error) {
-	//TODO niceify
-	ds := req.Queries[0].DataSource
-	endpoint, err := getTsdbQueryEndpointFor(ds)
+func HandleRequest(ctx context.Context, dsInfo *models.DataSource, req *TsdbQuery) (*Response, error) {
+	endpoint, err := getTsdbQueryEndpointFor(dsInfo)
 	if err != nil {
 		return nil, err
 	}
 
-	res := endpoint.Query(ctx, ds, req)
-	if res.Error != nil {
-		return nil, res.Error
-	}
-
-	return &Response{
-		Results:      res.QueryResults,
-		BatchTimings: []*BatchTiming{res.Timings},
-	}, nil
+	return endpoint.Query(ctx, dsInfo, req)
 }

pkg/tsdb/testdata/testdata.go

@@ -24,19 +24,19 @@ func init() {
 	tsdb.RegisterTsdbQueryEndpoint("grafana-testdata-datasource", NewTestDataExecutor)
 }
 
-func (e *TestDataExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) *tsdb.BatchResult {
-	result := &tsdb.BatchResult{}
-	result.QueryResults = make(map[string]*tsdb.QueryResult)
+func (e *TestDataExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
+	result := &tsdb.Response{}
+	result.Results = make(map[string]*tsdb.QueryResult)
 
 	for _, query := range tsdbQuery.Queries {
 		scenarioId := query.Model.Get("scenarioId").MustString("random_walk")
 		if scenario, exist := ScenarioRegistry[scenarioId]; exist {
-			result.QueryResults[query.RefId] = scenario.Handler(query, tsdbQuery)
-			result.QueryResults[query.RefId].RefId = query.RefId
+			result.Results[query.RefId] = scenario.Handler(query, tsdbQuery)
+			result.Results[query.RefId].RefId = query.RefId
 		} else {
 			e.log.Error("Scenario not found", "scenarioId", scenarioId)
 		}
 	}
 
-	return result
+	return result, nil
 }

pkg/tsdb/tsdb_test.go

@@ -19,7 +19,7 @@ func TestMetricQuery(t *testing.T) {
 		fakeExecutor := registerFakeExecutor()
 		fakeExecutor.Return("A", TimeSeriesSlice{&TimeSeries{Name: "argh"}})
 
-		res, err := HandleRequest(context.TODO(), req)
+		res, err := HandleRequest(context.TODO(), &models.DataSource{Id: 1, Type: "test"}, req)
 		So(err, ShouldBeNil)
 
 		Convey("Should return query results", func() {
@@ -40,18 +40,13 @@ func TestMetricQuery(t *testing.T) {
 		fakeExecutor.Return("A", TimeSeriesSlice{&TimeSeries{Name: "argh"}})
 		fakeExecutor.Return("B", TimeSeriesSlice{&TimeSeries{Name: "barg"}})
 
-		res, err := HandleRequest(context.TODO(), req)
+		res, err := HandleRequest(context.TODO(), &models.DataSource{Id: 1, Type: "test"}, req)
 		So(err, ShouldBeNil)
 
 		Convey("Should return query results", func() {
 			So(len(res.Results), ShouldEqual, 2)
 			So(res.Results["B"].Series[0].Name, ShouldEqual, "barg")
 		})
-
-		Convey("Should have been batched in one request", func() {
-			So(len(res.BatchTimings), ShouldEqual, 1)
-		})
-
 	})
 
 	Convey("When query uses data source of unknown type", t, func() {
@@ -61,7 +56,7 @@ func TestMetricQuery(t *testing.T) {
 			},
 		}
 
-		_, err := HandleRequest(context.TODO(), req)
+		_, err := HandleRequest(context.TODO(), &models.DataSource{Id: 12, Type: "testjughjgjg"}, req)
 		So(err, ShouldNotBeNil)
 	})
 }