Refactor: move getQueryRunner() to PanelModel (#16679)

* move queryRunner to panelModel
* Added interval back as prop, not used yet
* PanelQueryRunner: Refactoring, added getQueryRunner to PanelModel
* PanelQueryRunner: interpolatel min interval

public/app/features/dashboard/dashgrid/PanelChrome.tsx

@@ -22,7 +22,7 @@ import { ScopedVars } from '@grafana/ui';
 
 import templateSrv from 'app/features/templating/template_srv';
 
-import { PanelQueryRunner, getProcessedSeriesData } from '../state/PanelQueryRunner';
+import { getProcessedSeriesData } from '../state/PanelQueryRunner';
 import { Unsubscribable } from 'rxjs';
 
 const DEFAULT_PLUGIN_ERROR = 'Error in plugin';
@@ -134,16 +134,17 @@ export class PanelChrome extends PureComponent<Props, State> {
     // Issue Query
     if (this.wantsQueryExecution) {
       if (width < 0) {
-        console.log('No width yet... wait till we know');
+        console.log('Refresh skippted, no width yet... wait till we know');
         return;
       }
-      if (!panel.queryRunner) {
-        panel.queryRunner = new PanelQueryRunner();
-      }
+
+      const queryRunner = panel.getQueryRunner();
+
       if (!this.querySubscription) {
-        this.querySubscription = panel.queryRunner.subscribe(this.panelDataObserver);
+        this.querySubscription = queryRunner.subscribe(this.panelDataObserver);
       }
-      panel.queryRunner.run({
+
+      queryRunner.run({
         datasource: panel.datasource,
         queries: panel.targets,
         panelId: panel.id,
@@ -152,8 +153,8 @@ export class PanelChrome extends PureComponent<Props, State> {
         timeRange: timeData.timeRange,
         timeInfo: timeData.timeInfo,
         widthPixels: width,
-        minInterval: undefined, // Currently not passed in DataPanel?
         maxDataPoints: panel.maxDataPoints,
+        minInterval: panel.interval,
         scopedVars: panel.scopedVars,
         cacheTimeout: panel.cacheTimeout,
       });

public/app/features/dashboard/panel_editor/QueriesTab.tsx

@@ -20,7 +20,7 @@ import { PanelModel } from '../state/PanelModel';
 import { DashboardModel } from '../state/DashboardModel';
 import { DataQuery, DataSourceSelectItem, PanelData, LoadingState } from '@grafana/ui/src/types';
 import { PluginHelp } from 'app/core/components/PluginHelp/PluginHelp';
-import { PanelQueryRunner, PanelQueryRunnerFormat } from '../state/PanelQueryRunner';
+import { PanelQueryRunnerFormat } from '../state/PanelQueryRunner';
 import { Unsubscribable } from 'rxjs';
 
 interface Props {
@@ -58,12 +58,9 @@ export class QueriesTab extends PureComponent<Props, State> {
 
   componentDidMount() {
     const { panel } = this.props;
+    const queryRunner = panel.getQueryRunner();
 
-    if (!panel.queryRunner) {
-      panel.queryRunner = new PanelQueryRunner();
-    }
-
-    this.querySubscription = panel.queryRunner.subscribe(this.panelDataObserver, PanelQueryRunnerFormat.both);
+    this.querySubscription = queryRunner.subscribe(this.panelDataObserver, PanelQueryRunnerFormat.both);
   }
 
   componentWillUnmount() {

public/app/features/dashboard/state/PanelModel.ts

@@ -118,7 +118,7 @@ export class PanelModel {
   cachedPluginOptions?: any;
   legend?: { show: boolean };
   plugin?: PanelPlugin;
-  queryRunner?: PanelQueryRunner;
+  private queryRunner?: PanelQueryRunner;
 
   constructor(model: any) {
     this.events = new Emitter();
@@ -326,6 +326,13 @@ export class PanelModel {
     });
   }
 
+  getQueryRunner(): PanelQueryRunner {
+    if (!this.queryRunner) {
+      this.queryRunner = new PanelQueryRunner();
+    }
+    return this.queryRunner;
+  }
+
   destroy() {
     this.events.emit('panel-teardown');
     this.events.removeAllListeners();

public/app/features/dashboard/state/PanelQueryRunner.test.ts

@@ -1,6 +1,8 @@
-import { getProcessedSeriesData } from './PanelQueryRunner';
+import { getProcessedSeriesData, PanelQueryRunner } from './PanelQueryRunner';
+import { PanelData, DataQueryOptions } from '@grafana/ui/src/types';
+import moment from 'moment';
 
-describe('QueryRunner', () => {
+describe('PanelQueryRunner', () => {
   it('converts timeseries to table skipping nulls', () => {
     const input1 = {
       target: 'Field Name',
@@ -35,3 +37,133 @@ describe('QueryRunner', () => {
     expect(getProcessedSeriesData([])).toEqual([]);
   });
 });
+
+interface ScenarioContext {
+  setup: (fn: () => void) => void;
+  maxDataPoints?: number | null;
+  widthPixels: number;
+  dsInterval?: string;
+  minInterval?: string;
+  events?: PanelData[];
+  res?: PanelData;
+  queryCalledWith?: DataQueryOptions;
+}
+
+type ScenarioFn = (ctx: ScenarioContext) => void;
+
+function describeQueryRunnerScenario(description: string, scenarioFn: ScenarioFn) {
+  describe(description, () => {
+    let setupFn = () => {};
+
+    const ctx: ScenarioContext = {
+      widthPixels: 200,
+      setup: (fn: () => void) => {
+        setupFn = fn;
+      },
+    };
+
+    let runner: PanelQueryRunner;
+    const response: any = {
+      data: [{ target: 'hello', datapoints: [] }],
+    };
+
+    beforeEach(async () => {
+      setupFn();
+
+      const ds: any = {
+        interval: ctx.dsInterval,
+        query: (options: DataQueryOptions) => {
+          ctx.queryCalledWith = options;
+          return Promise.resolve(response);
+        },
+        testDatasource: jest.fn(),
+      };
+
+      const args: any = {
+        ds: ds as any,
+        datasource: '',
+        minInterval: ctx.minInterval,
+        widthPixels: ctx.widthPixels,
+        maxDataPoints: ctx.maxDataPoints,
+        timeRange: {
+          from: moment().subtract(1, 'days'),
+          to: moment(),
+          raw: { from: '1h', to: 'now' },
+        },
+        panelId: 0,
+        queries: [{ refId: 'A', test: 1 }],
+      };
+
+      runner = new PanelQueryRunner();
+      runner.subscribe({
+        next: (data: PanelData) => {
+          ctx.events.push(data);
+        },
+      });
+
+      ctx.events = [];
+      ctx.res = await runner.run(args);
+    });
+
+    scenarioFn(ctx);
+  });
+}
+
+describe('PanelQueryRunner', () => {
+  describeQueryRunnerScenario('with no maxDataPoints or minInterval', ctx => {
+    ctx.setup(() => {
+      ctx.maxDataPoints = null;
+      ctx.widthPixels = 200;
+    });
+
+    it('should return data', async () => {
+      expect(ctx.res.error).toBeUndefined();
+      expect(ctx.res.series.length).toBe(1);
+    });
+
+    it('should use widthPixels as maxDataPoints', async () => {
+      expect(ctx.queryCalledWith.maxDataPoints).toBe(200);
+    });
+
+    it('should calculate interval based on width', async () => {
+      expect(ctx.queryCalledWith.interval).toBe('5m');
+    });
+
+    it('fast query should only publish 1 data events', async () => {
+      expect(ctx.events.length).toBe(1);
+    });
+  });
+
+  describeQueryRunnerScenario('with no panel min interval but datasource min interval', ctx => {
+    ctx.setup(() => {
+      ctx.widthPixels = 20000;
+      ctx.dsInterval = '15s';
+    });
+
+    it('should limit interval to data source min interval', async () => {
+      expect(ctx.queryCalledWith.interval).toBe('15s');
+    });
+  });
+
+  describeQueryRunnerScenario('with panel min interval and data source min interval', ctx => {
+    ctx.setup(() => {
+      ctx.widthPixels = 20000;
+      ctx.dsInterval = '15s';
+      ctx.minInterval = '30s';
+    });
+
+    it('should limit interval to panel min interval', async () => {
+      expect(ctx.queryCalledWith.interval).toBe('30s');
+    });
+  });
+
+  describeQueryRunnerScenario('with maxDataPoints', ctx => {
+    ctx.setup(() => {
+      ctx.maxDataPoints = 10;
+    });
+
+    it('should pass maxDataPoints if specified', async () => {
+      expect(ctx.queryCalledWith.maxDataPoints).toBe(10);
+    });
+  });
+});

public/app/features/dashboard/state/PanelQueryRunner.ts

@@ -1,5 +1,13 @@
-import { getDatasourceSrv } from 'app/features/plugins/datasource_srv';
+// Libraries
+import cloneDeep from 'lodash/cloneDeep';
 import { Subject, Unsubscribable, PartialObserver } from 'rxjs';
+
+// Services & Utils
+import { getDatasourceSrv } from 'app/features/plugins/datasource_srv';
+import kbn from 'app/core/utils/kbn';
+import templateSrv from 'app/features/templating/template_srv';
+
+// Components & Types
 import {
   guessFieldTypes,
   toSeriesData,
@@ -16,10 +24,6 @@ import {
   DataSourceApi,
 } from '@grafana/ui';
 
-import cloneDeep from 'lodash/cloneDeep';
-
-import kbn from 'app/core/utils/kbn';
-
 export interface QueryRunnerOptions<TQuery extends DataQuery = DataQuery> {
   ds?: DataSourceApi<TQuery>; // if they already have the datasource, don't look it up
   datasource: string | null;
@@ -27,11 +31,11 @@ export interface QueryRunnerOptions<TQuery extends DataQuery = DataQuery> {
   panelId: number;
   dashboardId?: number;
   timezone?: string;
-  timeRange?: TimeRange;
+  timeRange: TimeRange;
   timeInfo?: string; // String description of time range for display
   widthPixels: number;
-  minInterval?: string;
-  maxDataPoints?: number;
+  maxDataPoints: number | undefined | null;
+  minInterval: string | undefined | null;
   scopedVars?: ScopedVars;
   cacheTimeout?: string;
   delayStateNotification?: number; // default 100ms.
@@ -98,6 +102,7 @@ export class PanelQueryRunner {
       widthPixels,
       maxDataPoints,
       scopedVars,
+      minInterval,
       delayStateNotification,
     } = options;
 
@@ -118,14 +123,12 @@ export class PanelQueryRunner {
     };
 
     if (!queries) {
-      this.data = {
+      return this.publishUpdate({
         state: LoadingState.Done,
         series: [], // Clear the data
         legacy: [],
         request,
-      };
-      this.subject.next(this.data);
-      return this.data;
+      });
     }
 
     let loadingStateTimeoutId = 0;
@@ -133,8 +136,8 @@ export class PanelQueryRunner {
     try {
       const ds = options.ds ? options.ds : await getDatasourceSrv().get(datasource, request.scopedVars);
 
-      const minInterval = options.minInterval || ds.interval;
-      const norm = kbn.calculateInterval(timeRange, widthPixels, minInterval);
+      const lowerIntervalLimit = minInterval ? templateSrv.replace(minInterval, request.scopedVars) : ds.interval;
+      const norm = kbn.calculateInterval(timeRange, widthPixels, lowerIntervalLimit);
 
       // make shallow copy of scoped vars,
       // and add built in variables interval and interval_ms
@@ -142,6 +145,7 @@ export class PanelQueryRunner {
         __interval: { text: norm.interval, value: norm.interval },
         __interval_ms: { text: norm.intervalMs, value: norm.intervalMs },
       });
+
       request.interval = norm.interval;
       request.intervalMs = norm.intervalMs;
 
@@ -151,7 +155,6 @@ export class PanelQueryRunner {
       }, delayStateNotification || 500);
 
       const resp = await ds.query(request);
-
       request.endTime = Date.now();
 
       // Make sure the response is in a supported format
@@ -229,5 +232,6 @@ export function getProcessedSeriesData(results?: any[]): SeriesData[] {
       series.push(guessFieldTypes(toSeriesData(r)));
     }
   }
+
   return series;
 }

public/app/features/panel/specs/metrics_panel_ctrl.test.ts

@@ -30,7 +30,7 @@ describe('MetricsPanelCtrl', () => {
     describe('and has datasource set that supports explore and user does not have access to explore', () => {
       it('should not return any items', () => {
         const ctrl = setupController({ hasAccessToExplore: false });
-        ctrl.datasource = { meta: { explore: true } };
+        ctrl.datasource = { meta: { explore: true } } as any;
 
         expect(ctrl.getAdditionalMenuItems().length).toBe(0);
       });
@@ -39,7 +39,7 @@ describe('MetricsPanelCtrl', () => {
     describe('and has datasource set that supports explore and user has access to explore', () => {
       it('should return one item', () => {
         const ctrl = setupController({ hasAccessToExplore: true });
-        ctrl.datasource = { meta: { explore: true } };
+        ctrl.datasource = { meta: { explore: true } } as any;
 
         expect(ctrl.getAdditionalMenuItems().length).toBe(1);
       });