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File Content: `usePanelLatestData.ts`

import { useEffect, useRef, useState } from 'react';
import { Unsubscribable } from 'rxjs';

import { LoadingState, PanelData } from '@grafana/data';

import { GetDataOptions } from '../../../query/state/PanelQueryRunner';
import { PanelModel } from '../../state';

interface UsePanelLatestData {
  data?: PanelData;
  hasError: boolean;
  isLoading: boolean;
  hasSeries: boolean;
}

/**
 * Subscribes and returns latest panel data from PanelQueryRunner
 */
export const usePanelLatestData = (
  panel: PanelModel,
  options: GetDataOptions,
  checkSchema?: boolean
): UsePanelLatestData => {
  const querySubscription = useRef<Unsubscribable>();
  const [latestData, setLatestData] = useState<PanelData>();

  useEffect(() => {
    let lastRev = -1;
    let lastUpdate = 0;

    querySubscription.current = panel
      .getQueryRunner()
      // We apply field config later
      .getData({ withTransforms: options.withTransforms, withFieldConfig: false })
      .subscribe({
        next: (data) => {
          if (checkSchema) {
            if (lastRev === data.structureRev) {
              const now = Date.now();
              const elapsed = now - lastUpdate;
              if (elapsed < 10000) {
                return; // avoid updates if the schema has not changed for 10s
              }
              lastUpdate = now;
            }
            lastRev = data.structureRev ?? -1;
          }
          setLatestData(data);
        },
      });

    return () => {
      if (querySubscription.current) {
        querySubscription.current.unsubscribe();
      }
    };
    /**
     * Adding separate options to dependencies array to avoid additional hook for comparing previous options with current.
     * Otherwise, passing different references to the same object might cause troubles.
     */
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [panel, options.withTransforms]);

  return {
    data: latestData,
    isLoading: latestData?.state === LoadingState.Loading,
    hasSeries: latestData ? !!latestData.series : false,
    hasError: Boolean(
      latestData && (latestData.error || latestData?.errors?.length || latestData.state === LoadingState.Error)
    ),
  };
};

Name	Size	Permission
state	---	0755
AngularPanelOptions.tsx	3907 bytes	0644
DynamicConfigValueEditor.tsx	3678 bytes	0644
OptionsPane.tsx	2615 bytes	0644
OptionsPaneCategory.tsx	5759 bytes	0644
OptionsPaneCategoryDescriptor.tsx	1835 bytes	0644
OptionsPaneItemDescriptor.tsx	3584 bytes	0644
OptionsPaneItemOverrides.tsx	1208 bytes	0644
OptionsPaneOptions.test.tsx	9120 bytes	0644
OptionsPaneOptions.tsx	7812 bytes	0644
OverrideCategoryTitle.tsx	2069 bytes	0644
PanelEditor.tsx	16794 bytes	0644
PanelEditorQueries.tsx	4139 bytes	0644
PanelEditorTableView.test.tsx	7264 bytes	0644
PanelEditorTableView.tsx	2203 bytes	0644
PanelEditorTabs.tsx	4931 bytes	0644
PanelHeaderCorner.test.tsx	708 bytes	0644
PanelHeaderCorner.tsx	3489 bytes	0644
PanelNotSupported.test.tsx	1398 bytes	0644
PanelNotSupported.tsx	849 bytes	0644
VisualizationButton.tsx	2277 bytes	0644
VisualizationSelectPane.tsx	6512 bytes	0644
getFieldOverrideElements.tsx	8273 bytes	0644
getLibraryPanelOptions.tsx	1704 bytes	0644
getPanelFrameOptions.tsx	11327 bytes	0644
getVisualizationOptions.test.ts	4366 bytes	0644
getVisualizationOptions.tsx	9787 bytes	0644
types.ts	1823 bytes	0644
usePanelLatestData.ts	2206 bytes	0644
utils.test.ts	5250 bytes	0644
utils.ts	2895 bytes	0644

File Content: usePanelLatestData.ts

File Content: `usePanelLatestData.ts`