Explore: avoid locking timepicker when range is inverted (#44790)

* Explore: avoid locking timepicker when range is inverted

* Explore: prevent time picker to lock if from & to search parameters are present

public/app/core/utils/explore.test.ts

@@ -11,6 +11,7 @@ import {
   getExploreUrl,
   GetExploreUrlArguments,
   getTimeRangeFromUrl,
+  getTimeRange,
 } from './explore';
 import store from 'app/core/store';
 import { dateTime, ExploreUrlState, LogsSortOrder } from '@grafana/data';
@@ -361,6 +362,19 @@ describe('getTimeRangeFromUrl', () => {
   });
 });
 
+describe('getTimeRange', () => {
+  describe('should flip from and to when from is after to', () => {
+    const rawRange = {
+      from: 'now',
+      to: 'now-6h',
+    };
+
+    const range = getTimeRange('utc', rawRange, 0);
+
+    expect(range.from.isBefore(range.to)).toBe(true);
+  });
+});
+
 describe('getRefIds', () => {
   describe('when called with a null value', () => {
     it('then it should return empty array', () => {

public/app/core/utils/explore.ts

@@ -358,11 +358,13 @@ export const getQueryKeys = (queries: DataQuery[], datasourceInstance?: DataSour
 };
 
 export const getTimeRange = (timeZone: TimeZone, rawRange: RawTimeRange, fiscalYearStartMonth: number): TimeRange => {
-  return {
-    from: dateMath.parse(rawRange.from, false, timeZone as any, fiscalYearStartMonth)!,
-    to: dateMath.parse(rawRange.to, true, timeZone as any, fiscalYearStartMonth)!,
-    raw: rawRange,
-  };
+  let range = rangeUtil.convertRawToRange(rawRange, timeZone, fiscalYearStartMonth);
+
+  if (range.to.isBefore(range.from)) {
+    range = rangeUtil.convertRawToRange({ from: range.raw.to, to: range.raw.from }, timeZone, fiscalYearStartMonth);
+  }
+
+  return range;
 };
 
 const parseRawTime = (value: string | DateTime): TimeFragment | null => {

public/app/features/explore/Wrapper.test.tsx

@@ -314,12 +314,20 @@ describe('Wrapper', () => {
     store.dispatch(splitOpen<any>({ datasourceUid: 'elastic', query: { expr: 'error' } }) as any);
     await waitFor(() => expect(document.title).toEqual('Explore - loki | elastic - Grafana'));
   });
+
+  it('removes `from` and `to` parameters from url when first mounted', () => {
+    setup({ searchParams: 'from=1&to=2&orgId=1' });
+
+    expect(locationService.getSearchObject()).toEqual(expect.not.objectContaining({ from: '1', to: '2' }));
+    expect(locationService.getSearchObject()).toEqual(expect.objectContaining({ orgId: '1' }));
+  });
 });
 
 type DatasourceSetup = { settings: DataSourceInstanceSettings; api: DataSourceApi };
 type SetupOptions = {
   datasources?: DatasourceSetup[];
   query?: any;
+  searchParams?: string;
 };
 
 function setup(options?: SetupOptions): { datasources: { [name: string]: DataSourceApi }; store: EnhancedStore } {
@@ -368,7 +376,7 @@ function setup(options?: SetupOptions): { datasources: { [name: string]: DataSou
     },
   };
 
-  locationService.push({ pathname: '/explore' });
+  locationService.push({ pathname: '/explore', search: options?.searchParams });
 
   if (options?.query) {
     locationService.partial(options.query);

public/app/features/explore/Wrapper.tsx

@@ -10,6 +10,7 @@ import { Branding } from '../../core/components/Branding/Branding';
 
 import { getNavModel } from '../../core/selectors/navModel';
 import { StoreState } from 'app/types';
+import { locationService } from '@grafana/runtime';
 
 interface RouteProps extends GrafanaRouteComponentProps<{}, ExploreQueryParams> {}
 interface OwnProps {}
@@ -38,6 +39,20 @@ class WrapperUnconnected extends PureComponent<Props> {
     lastSavedUrl.left = undefined;
     lastSavedUrl.right = undefined;
 
+    // timeSrv (which is used internally) on init reads `from` and `to` param from the URL and updates itself
+    // using those value regardless of what is passed to the init method.
+    // The updated value is then used by Explore to get the range for each pane.
+    // This means that if `from` and `to` parameters are present in the URL,
+    // it would be impossible to change the time range in Explore.
+    // We are only doing this on mount for 2 reasons:
+    // 1: Doing it on update means we'll enter a render loop.
+    // 2: when parsing time in Explore (before feeding it to timeSrv) we make sure `from` is before `to` inside
+    //    each pane state in order to not trigger un URL update from timeSrv.
+    const searchParams = locationService.getSearchObject();
+    if (searchParams.from || searchParams.to) {
+      locationService.partial({ from: undefined, to: undefined }, true);
+    }
+
     const richHistory = getRichHistory();
     this.props.richHistoryUpdatedAction({ richHistory });
   }