stackdriver: add aggregation query

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

@@ -2,6 +2,7 @@ import {
   extractServicesFromMetricDescriptors,
   getMetricTypesByService,
   getAlignmentOptionsByMetric,
+  getAggregationOptionsByMetric,
 } from './functions';
 import { alignmentPeriods } from './constants';
 import has from 'lodash/has';
@@ -24,6 +25,8 @@ export default class StackdriverMetricFindQuery {
         return this.handleAlignersType(query);
       case 'alignmentPeriods':
         return this.handleAlignmentPeriodType();
+      case 'aggregations':
+        return this.handleAggregationType(query);
       default:
         return [];
     }
@@ -107,6 +110,18 @@ export default class StackdriverMetricFindQuery {
     }));
   }
 
+  async handleAggregationType({ metricType }) {
+    if (!metricType) {
+      return [];
+    }
+    const metricDescriptors = await this.datasource.getMetricTypes(this.datasource.projectName);
+    const { valueType, metricKind } = metricDescriptors.find(m => m.type === metricType);
+    return getAggregationOptionsByMetric(valueType, metricKind).map(o => ({
+      ...o,
+      expandable: true,
+    }));
+  }
+
   handleAlignmentPeriodType() {
     return alignmentPeriods.map(s => ({
       ...s,

public/app/plugins/datasource/stackdriver/components/TemplateQueryComponent.tsx

@@ -134,6 +134,7 @@ export class StackdriverTemplateQueryComponent extends PureComponent<TemplateQue
           </React.Fragment>
         );
       case 'alignerns':
+      case 'aggregations':
         return (
           <React.Fragment>
             <ServiceSelector metricDescriptors={this.state.metricDescriptors} onServiceChange={this.onServiceChange} />

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

-import { alignOptions } from './constants';
+import { alignOptions, aggOptions } from './constants';
 import uniqBy from 'lodash/uniqBy';
 
 export const extractServicesFromMetricDescriptors = metricDescriptors => uniqBy(metricDescriptors, 'service');
@@ -13,3 +13,11 @@ export const getAlignmentOptionsByMetric = (metricValueType, metricKind) => {
         return i.valueTypes.indexOf(metricValueType) !== -1 && i.metricKinds.indexOf(metricKind) !== -1;
       });
 };
+
+export const getAggregationOptionsByMetric = (valueType, metricKind) => {
+  return !metricKind
+    ? []
+    : aggOptions.filter(i => {
+        return i.valueTypes.indexOf(valueType) !== -1 && i.metricKinds.indexOf(metricKind) !== -1;
+      });
+};

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

 import coreModule from 'app/core/core_module';
 import _ from 'lodash';
 import * as options from './constants';
-import { getAlignmentOptionsByMetric } from './functions';
+import { getAlignmentOptionsByMetric, getAggregationOptionsByMetric } from './functions';
 import kbn from 'app/core/utils/kbn';
 
 export class StackdriverAggregation {
@@ -49,13 +49,7 @@ export class StackdriverAggregationCtrl {
   }
 
   setAggOptions() {
-    this.aggOptions = !this.target.metricKind
-      ? []
-      : options.aggOptions.filter(i => {
-          return (
-            i.valueTypes.indexOf(this.target.valueType) !== -1 && i.metricKinds.indexOf(this.target.metricKind) !== -1
-          );
-        });
+    this.aggOptions = getAggregationOptionsByMetric(this.target.valueType, this.target.metricKind);
 
     if (!this.aggOptions.find(o => o.value === this.target.aggregation.crossSeriesReducer)) {
       this.deselectAggregationOption('REDUCE_NONE');