stackdriver: adds support for primary aggregations

WIP: Hardcoded values for the aligner and alignment period. Need
to set the aligment period to the closest min interval and
research the aligner more.

pkg/tsdb/stackdriver/stackdriver.go

@@ -59,7 +59,7 @@ func (e *StackdriverExecutor) Query(ctx context.Context, dsInfo *models.DataSour
 		Results: make(map[string]*tsdb.QueryResult),
 	}
 
-	queries, err := e.parseQueries(tsdbQuery)
+	queries, err := e.buildQueries(tsdbQuery)
 	if err != nil {
 		return nil, err
 	}
@@ -75,7 +75,7 @@ func (e *StackdriverExecutor) Query(ctx context.Context, dsInfo *models.DataSour
 	return result, nil
 }
 
-func (e *StackdriverExecutor) parseQueries(tsdbQuery *tsdb.TsdbQuery) ([]*StackdriverQuery, error) {
+func (e *StackdriverExecutor) buildQueries(tsdbQuery *tsdb.TsdbQuery) ([]*StackdriverQuery, error) {
 	stackdriverQueries := []*StackdriverQuery{}
 
 	startTime, err := tsdbQuery.TimeRange.ParseFrom()
@@ -102,8 +102,8 @@ func (e *StackdriverExecutor) parseQueries(tsdbQuery *tsdb.TsdbQuery) ([]*Stackd
 		params := url.Values{}
 		params.Add("interval.startTime", startTime.UTC().Format(time.RFC3339))
 		params.Add("interval.endTime", endTime.UTC().Format(time.RFC3339))
-		params.Add("aggregation.perSeriesAligner", "ALIGN_NONE")
+		params.Add("filter", "metric.type=\""+metricType+"\"")
-		params.Add("filter", metricType)
+		setAggParams(&params, query)
 
 		if setting.Env == setting.DEV {
 			slog.Debug("Stackdriver request", "params", params)
@@ -119,6 +119,22 @@ func (e *StackdriverExecutor) parseQueries(tsdbQuery *tsdb.TsdbQuery) ([]*Stackd
 	return stackdriverQueries, nil
 }
 
+func setAggParams(params *url.Values, query *tsdb.Query) {
+	primaryAggregation := query.Model.Get("primaryAggregation").MustString()
+	if primaryAggregation == "" {
+		primaryAggregation = "REDUCE_NONE"
+	}
+
+	if primaryAggregation == "REDUCE_NONE" {
+		params.Add("aggregation.perSeriesAligner", "ALIGN_NONE")
+	} else {
+		params.Add("aggregation.crossSeriesReducer", primaryAggregation)
+		params.Add("aggregation.perSeriesAligner", "ALIGN_MEAN")
+		params.Add("aggregation.alignmentPeriod", "+60s")
+	}
+
+}
+
 func (e *StackdriverExecutor) executeQuery(ctx context.Context, query *StackdriverQuery, tsdbQuery *tsdb.TsdbQuery) (*tsdb.QueryResult, error) {
 	queryResult := &tsdb.QueryResult{Meta: simplejson.New(), RefId: query.RefID}
 

pkg/tsdb/stackdriver/stackdriver_test.go

@@ -17,7 +17,7 @@ func TestStackdriver(t *testing.T) {
 	Convey("Stackdriver", t, func() {
 		executor := &StackdriverExecutor{}
 
-		Convey("Parse query from frontend", func() {
+		Convey("Parse queries from frontend and build Stackdriver API queries", func() {
 			fromStart := time.Date(2018, 3, 15, 13, 0, 0, 0, time.UTC).In(time.Local)
 			tsdbQuery := &tsdb.TsdbQuery{
 				TimeRange: &tsdb.TimeRange{
@@ -34,7 +34,9 @@ func TestStackdriver(t *testing.T) {
 					},
 				},
 			}
-			queries, err := executor.parseQueries(tsdbQuery)
+
+			Convey("and query has no aggregation set", func() {
+				queries, err := executor.buildQueries(tsdbQuery)
 				So(err, ShouldBeNil)
 
 				So(len(queries), ShouldEqual, 1)
@@ -44,7 +46,31 @@ func TestStackdriver(t *testing.T) {
 				So(queries[0].Params["interval.startTime"][0], ShouldEqual, "2018-03-15T13:00:00Z")
 				So(queries[0].Params["interval.endTime"][0], ShouldEqual, "2018-03-15T13:34:00Z")
 				So(queries[0].Params["aggregation.perSeriesAligner"][0], ShouldEqual, "ALIGN_NONE")
-			So(queries[0].Params["filter"][0], ShouldEqual, "a/metric/type")
+				So(queries[0].Params["filter"][0], ShouldEqual, "metric.type=\"a/metric/type\"")
+			})
+
+			Convey("and query has aggregation mean set", func() {
+				tsdbQuery.Queries[0].Model = simplejson.NewFromAny(map[string]interface{}{
+					"target":             "target",
+					"metricType":         "a/metric/type",
+					"primaryAggregation": "REDUCE_MEAN",
+				})
+
+				queries, err := executor.buildQueries(tsdbQuery)
+				So(err, ShouldBeNil)
+
+				So(len(queries), ShouldEqual, 1)
+				So(queries[0].RefID, ShouldEqual, "A")
+				So(queries[0].Target, ShouldEqual, "target")
+				So(len(queries[0].Params), ShouldEqual, 6)
+				So(queries[0].Params["interval.startTime"][0], ShouldEqual, "2018-03-15T13:00:00Z")
+				So(queries[0].Params["interval.endTime"][0], ShouldEqual, "2018-03-15T13:34:00Z")
+				So(queries[0].Params["aggregation.crossSeriesReducer"][0], ShouldEqual, "REDUCE_MEAN")
+				So(queries[0].Params["aggregation.perSeriesAligner"][0], ShouldEqual, "ALIGN_MEAN")
+				So(queries[0].Params["aggregation.alignmentPeriod"][0], ShouldEqual, "+60s")
+				So(queries[0].Params["filter"][0], ShouldEqual, "metric.type=\"a/metric/type\"")
+			})
+
 		})
 
 		Convey("Parse stackdriver response in the time series format", func() {

public/app/plugins/datasource/stackdriver/datasource.ts

@@ -15,7 +15,8 @@ export default class StackdriverDatasource {
     const queries = options.targets.filter(target => !target.hide).map(t => ({
       refId: t.refId,
       datasourceId: this.id,
-      metricType: `metric.type="${t.metricType}"`,
+      metricType: t.metricType,
+      primaryAggregation: t.aggregation,
     }));
 
     const result = [];
@@ -32,6 +33,9 @@ export default class StackdriverDatasource {
 
     if (data.results) {
       Object['values'](data.results).forEach(queryRes => {
+        if (!queryRes.series) {
+          return;
+        }
         queryRes.series.forEach(series => {
           result.push({
             target: series.name,

public/app/plugins/datasource/stackdriver/partials/query.editor.html

@@ -1,11 +1,4 @@
 <query-editor-row query-ctrl="ctrl" has-text-edit-mode="true">
-  <div class="gf-form-inline">
-    <div class="gf-form">
-      <span class="gf-form-label width-9">Project</span>
-      <input class="gf-form-input" disabled type="text" ng-model='ctrl.target.project.name' get-options="ctrl.getProjects()"
-        css-class="min-width-12" />
-    </div>
-  </div>
   <div class="gf-form-inline">
     <div class="gf-form">
       <span class="gf-form-label width-9">Metric Type</span>
@@ -17,6 +10,24 @@
     </div>
   </div>
   <div class="gf-form-inline">
+    <div class="gf-form gf-form--grow">
+      <label class="gf-form-label query-keyword width-9">Aggregation</label>
+      <div class="gf-form-select-wrapper gf-form-select-wrapper--caret-indent">
+        <select class="gf-form-input width-11" ng-model="ctrl.target.aggregation" ng-options="f.value as f.text for f in ctrl.aggOptions"
+          ng-change="ctrl.refresh()"></select>
+      </div>
+      <div class="gf-form-label gf-form-label--grow"></div>
+    </div>
+    <div class="gf-form gf-form--grow">
+      <div class="gf-form-label gf-form-label--grow"></div>
+    </div>
+  </div>
+  <div class="gf-form-inline">
+    <div class="gf-form">
+      <span class="gf-form-label width-9">Project</span>
+      <input class="gf-form-input" disabled type="text" ng-model='ctrl.target.project.name' get-options="ctrl.getProjects()"
+        css-class="min-width-12" />
+    </div>
     <div class="gf-form">
       <label class="gf-form-label query-keyword" ng-click="ctrl.showHelp = !ctrl.showHelp">
         Show Help

public/app/plugins/datasource/stackdriver/query_ctrl.ts

@@ -23,9 +23,24 @@ export class StackdriverQueryCtrl extends QueryCtrl {
       id: 'default',
       name: 'loading project...',
     },
-    // metricType: this.defaultDropdownValue,
+    metricType: this.defaultDropdownValue,
+    aggregation: 'REDUCE_MEAN',
   };
 
+  aggOptions = [
+    { text: 'none', value: 'REDUCE_NONE' },
+    { text: 'mean', value: 'REDUCE_MEAN' },
+    { text: 'min', value: 'REDUCE_MIN' },
+    { text: 'max', value: 'REDUCE_MAX' },
+    { text: 'sum', value: 'REDUCE_SUM' },
+    { text: 'std. dev.', value: 'REDUCE_STDDEV' },
+    { text: 'count', value: 'REDUCE_COUNT' },
+    { text: '99th percentile', value: 'REDUCE_PERCENTILE_99' },
+    { text: '95th percentile', value: 'REDUCE_PERCENTILE_95' },
+    { text: '50th percentile', value: 'REDUCE_PERCENTILE_50' },
+    { text: '5th percentile', value: 'REDUCE_PERCENTILE_05' },
+  ];
+
   showHelp: boolean;
   showLastQuery: boolean;
   lastQueryMeta: QueryMeta;

public/app/plugins/datasource/stackdriver/specs/datasource.test.ts

@@ -1,5 +1,6 @@
 import StackdriverDataSource from '../datasource';
 import { metricDescriptors } from './testData';
+import moment from 'moment';
 
 describe('StackdriverDataSource', () => {
   describe('when performing testDataSource', () => {
@@ -93,4 +94,51 @@ describe('StackdriverDataSource', () => {
       });
     });
   });
+
+  describe('When performing query', () => {
+    const options = {
+      range: {
+        from: moment.utc('2017-08-22T20:00:00Z'),
+        to: moment.utc('2017-08-22T23:59:00Z'),
+      },
+      rangeRaw: {
+        from: 'now-4h',
+        to: 'now',
+      },
+      targets: [
+        {
+          refId: 'A',
+        },
+      ],
+    };
+
+    describe('and no time series data is returned', () => {
+      let ds;
+      const response = {
+        results: {
+          A: {
+            refId: 'A',
+            meta: {
+              rawQuery: 'arawquerystring',
+            },
+            series: null,
+            tables: null,
+          },
+        },
+      };
+
+      beforeEach(() => {
+        const backendSrv = {
+          datasourceRequest: async () => Promise.resolve({ status: 200, data: response }),
+        };
+        ds = new StackdriverDataSource({}, backendSrv);
+      });
+
+      it('should return a list of datapoints', () => {
+        return ds.query(options).then(results => {
+          expect(results.data.length).toBe(0);
+        });
+      });
+    });
+  });
 });