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

import React, { PureComponent } from 'react';
import { connect, ConnectedProps } from 'react-redux';
import { ExploreId, ExploreQueryParams } from 'app/types/explore';
import { ErrorBoundaryAlert } from '@grafana/ui';
import { lastSavedUrl, resetExploreAction, richHistoryUpdatedAction } from './state/main';
import { ExplorePaneContainer } from './ExplorePaneContainer';
import { GrafanaRouteComponentProps } from 'app/core/navigation/types';
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 {}

const mapStateToProps = (state: StoreState) => {
  return {
    navModel: getNavModel(state.navIndex, 'explore'),
    exploreState: state.explore,
  };
};

const mapDispatchToProps = {
  resetExploreAction,
  richHistoryUpdatedAction,
};

const connector = connect(mapStateToProps, mapDispatchToProps);

type Props = OwnProps & RouteProps & ConnectedProps<typeof connector>;
class WrapperUnconnected extends PureComponent<Props> {
  componentWillUnmount() {
    this.props.resetExploreAction({});
  }

  componentDidMount() {
    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);
    }
  }

  componentDidUpdate(prevProps: Props) {
    const { left, right } = this.props.queryParams;
    const hasSplit = Boolean(left) && Boolean(right);
    const datasourceTitle = hasSplit
      ? `${this.props.exploreState.left.datasourceInstance?.name} | ${this.props.exploreState.right?.datasourceInstance?.name}`
      : `${this.props.exploreState.left.datasourceInstance?.name}`;
    const documentTitle = `${this.props.navModel.main.text} - ${datasourceTitle} - ${Branding.AppTitle}`;
    document.title = documentTitle;
  }

  render() {
    const { left, right } = this.props.queryParams;
    const hasSplit = Boolean(left) && Boolean(right);

    return (
      <div className="page-scrollbar-wrapper">
        <div className="explore-wrapper">
          <ErrorBoundaryAlert style="page">
            <ExplorePaneContainer split={hasSplit} exploreId={ExploreId.left} urlQuery={left} />
          </ErrorBoundaryAlert>
          {hasSplit && (
            <ErrorBoundaryAlert style="page">
              <ExplorePaneContainer split={hasSplit} exploreId={ExploreId.right} urlQuery={right} />
            </ErrorBoundaryAlert>
          )}
        </div>
      </div>
    );
  }
}

const Wrapper = connector(WrapperUnconnected);

export default Wrapper;