refactor(histogram): move Histogram code to in-repo plugin package

2025-09-09 13:34:55 -04:00
parent acbc2cf01a
commit 094c768839
19 changed files with 623 additions and 11 deletions
@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [12.2.0-pre] - 2024-12-XX
+
+### Added
+
+- Initial release of @grafana/histogram package
+- Extracted histogram panel logic from main Grafana codebase
+- Supports all existing histogram functionality
@@ -0,0 +1,202 @@
+
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+   Copyright 2015 Grafana Labs
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
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+   limitations under the License.
@@ -0,0 +1,24 @@
+# Grafana Histogram component
+
+> **@grafana/histogram is currently in BETA**.
+
+This is a Histogram component that is used in Grafana to display histogram visualizations.
+
+## Usage
+
+Currently this library exposes histogram panel components and utilities for rendering histogram visualizations.
+
+```tsx
+import { HistogramPanel } from '@grafana/histogram';
+
+<HistogramPanel data={dataFrame} options={options} width={width} height={height} />;
+```
+
+#### Props
+
+| Name    | Type      | Description                                                                                           |
+| ------- | --------- | ----------------------------------------------------------------------------------------------------- |
+| data    | PanelData | Panel data containing the histogram data. Optional, if missing or empty the histogram is not rendered |
+| options | Options   | Histogram panel options for configuration                                                             |
+| width   | number    | Width of the visualization                                                                            |
+| height  | number    | Height of the visualization                                                                           |
@@ -0,0 +1,82 @@
+{
+  "author": "Grafana Labs",
+  "license": "Apache-2.0",
+  "name": "@grafana/histogram",
+  "version": "12.2.0-pre",
+  "description": "Grafana histogram visualization component",
+  "keywords": [
+    "grafana",
+    "histogram",
+    "visualization",
+    "chart"
+  ],
+  "sideEffects": false,
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/grafana/grafana.git",
+    "directory": "packages/grafana-histogram"
+  },
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "publishConfig": {
+    "main": "./dist/cjs/index.cjs",
+    "module": "./dist/esm/index.mjs",
+    "types": "./dist/types/index.d.ts",
+    "access": "public"
+  },
+  "files": [
+    "./dist",
+    "./README.md",
+    "./CHANGELOG.md",
+    "./LICENSE_APACHE2"
+  ],
+  "scripts": {
+    "build": "tsc -p ./tsconfig.build.json && rollup -c rollup.config.ts --configPlugin esbuild",
+    "bundle": "rollup -c rollup.config.ts --configPlugin esbuild",
+    "clean": "rimraf ./dist ./compiled ./package.tgz",
+    "typecheck": "tsc --emitDeclarationOnly false --noEmit",
+    "prepack": "cp package.json package.json.bak && node ../../scripts/prepare-npm-package.js",
+    "postpack": "mv package.json.bak package.json"
+  },
+  "browserslist": [
+    "defaults",
+    "not IE 11"
+  ],
+  "dependencies": {
+    "@emotion/css": "11.13.5",
+    "@grafana/data": "12.2.0-pre",
+    "@grafana/i18n": "12.2.0-pre",
+    "@grafana/schema": "12.2.0-pre",
+    "@grafana/ui": "12.2.0-pre",
+    "lodash": "4.17.21",
+    "react": "18.3.1",
+    "tslib": "2.8.1"
+  },
+  "devDependencies": {
+    "@babel/core": "7.28.0",
+    "@babel/preset-env": "7.28.0",
+    "@babel/preset-react": "7.27.1",
+    "@rollup/plugin-node-resolve": "16.0.1",
+    "@testing-library/dom": "10.4.1",
+    "@testing-library/jest-dom": "^6.1.2",
+    "@testing-library/react": "16.3.0",
+    "@testing-library/user-event": "14.6.1",
+    "@types/jest": "^29.5.4",
+    "@types/lodash": "4.17.20",
+    "@types/node": "22.17.0",
+    "@types/react": "18.3.18",
+    "babel-jest": "29.7.0",
+    "esbuild": "0.25.8",
+    "jest": "^29.6.4",
+    "rollup": "^4.22.4",
+    "rollup-plugin-esbuild": "6.2.1",
+    "rollup-plugin-node-externals": "^8.0.0",
+    "ts-jest": "29.4.0",
+    "ts-node": "10.9.2",
+    "typescript": "5.9.2"
+  },
+  "peerDependencies": {
+    "react": "^18.0.0",
+    "react-dom": "^18.0.0"
+  }
+}
@@ -0,0 +1,8 @@
+{
+  "$schema": "../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "library",
+  "tags": ["scope:package", "type:ui"],
+  "targets": {
+    "build": {}
+  }
+}
@@ -0,0 +1,15 @@
+import { createRequire } from 'node:module';
+
+import { cjsOutput, entryPoint, esmOutput, plugins } from '../rollup.config.parts';
+
+const rq = createRequire(import.meta.url);
+const pkg = rq('./package.json');
+
+export default [
+  {
+    input: entryPoint,
+    plugins,
+    output: [cjsOutput(pkg), esmOutput(pkg, 'grafana-histogram')],
+    treeshake: false,
+  },
+];
@@ -21,8 +21,9 @@ import {
  PlotLegend,
  measureText,
  UPLOT_AXIS_FONT_SIZE,
+  getStackingGroups,
+  preparePlotData2,
 } from '@grafana/ui';
-import { getStackingGroups, preparePlotData2 } from '@grafana/ui/internal';

 import { defaultFieldConfig, FieldConfig, Options } from './panelcfg.gen';

@@ -0,0 +1,122 @@
+import { useMemo } from 'react';
+
+import {
+  histogramFieldsToFrame,
+  joinHistograms,
+  DataFrameType,
+  PanelProps,
+  buildHistogram,
+  cacheFieldDisplayNames,
+  getHistogramFields,
+} from '@grafana/data';
+import { Trans } from '@grafana/i18n';
+import { TooltipDisplayMode, TooltipPlugin2, useTheme2, TooltipHoverMode } from '@grafana/ui';
+
+import { Histogram, getBucketSize } from './Histogram';
+import { HistogramTooltip } from './HistogramTooltip';
+import { Options } from './panelcfg.gen';
+
+type Props = PanelProps<Options>;
+
+export const HistogramPanel = ({ data, options, width, height }: Props) => {
+  const theme = useTheme2();
+
+  const histogram = useMemo(() => {
+    if (!data.series.length) {
+      return undefined;
+    }
+
+    // stamp origins for legend's calcs (from raw values)
+    data.series.forEach((frame, frameIndex) => {
+      frame.fields.forEach((field, fieldIndex) => {
+        field.state = {
+          ...field.state,
+          origin: {
+            frameIndex,
+            fieldIndex,
+          },
+        };
+      });
+    });
+
+    cacheFieldDisplayNames(data.series);
+
+    if (
+      data.series.length === 1 ||
+      data.series.every(
+        (frame) => frame.meta?.type === DataFrameType.HeatmapCells || frame.meta?.type === DataFrameType.HeatmapRows
+      )
+    ) {
+      const histograms = data.series.map((frame) => getHistogramFields(frame)).filter((hist) => hist != null);
+
+      if (histograms.length) {
+        return histogramFieldsToFrame(joinHistograms(histograms), theme);
+      }
+    }
+    const hist = buildHistogram(data.series, options, theme);
+    if (!hist) {
+      return undefined;
+    }
+
+    return histogramFieldsToFrame(hist, theme);
+  }, [data.series, options, theme]);
+
+  if (!histogram || !histogram.fields.length) {
+    return (
+      <div className="panel-empty">
+        <p>
+          <Trans i18nKey="histogram.histogram-panel.no-histogram-found-in-response">
+            No histogram found in response
+          </Trans>
+        </p>
+      </div>
+    );
+  }
+
+  const bucketSize = getBucketSize(histogram);
+
+  return (
+    <Histogram
+      options={options}
+      theme={theme}
+      legend={options.legend}
+      rawSeries={data.series}
+      structureRev={data.structureRev}
+      width={width}
+      height={height}
+      alignedFrame={histogram}
+      bucketSize={bucketSize}
+      bucketCount={options.bucketCount}
+    >
+      {(builder, alignedFrame, xMinOnlyFrame) => {
+        return (
+          <>
+            {options.tooltip.mode !== TooltipDisplayMode.None && (
+              <TooltipPlugin2
+                config={builder}
+                hoverMode={
+                  options.tooltip.mode === TooltipDisplayMode.Single ? TooltipHoverMode.xOne : TooltipHoverMode.xAll
+                }
+                render={(u, dataIdxs, seriesIdx, isPinned = false) => {
+                  return (
+                    <HistogramTooltip
+                      series={histogram}
+                      xMinOnlyFrame={xMinOnlyFrame}
+                      dataIdxs={dataIdxs}
+                      seriesIdx={seriesIdx}
+                      mode={options.tooltip.mode}
+                      sortOrder={options.tooltip.sort}
+                      isPinned={isPinned}
+                      maxHeight={options.tooltip.maxHeight}
+                    />
+                  );
+                }}
+                maxWidth={options.tooltip.maxWidth}
+              />
+            )}
+          </>
+        );
+      }}
+    </Histogram>
+  );
+};
@@ -1,7 +1,7 @@
 import { ReactNode, useMemo } from 'react';

 import { DataFrame, formattedValueToString } from '@grafana/data';
-import { SortOrder, TooltipDisplayMode } from '@grafana/schema/dist/esm/common/common.gen';
+import { SortOrder, TooltipDisplayMode } from '@grafana/schema';
 import {
  VizTooltipContent,
  VizTooltipFooter,
@@ -9,10 +9,9 @@ import {
  VizTooltipWrapper,
  getContentItems,
  VizTooltipItem,
-} from '@grafana/ui/internal';
+} from '@grafana/ui';

-import { getDataLinks } from '../status-history/utils';
-import { isTooltipScrollable } from '../timeseries/utils';
+import { getDataLinks, isTooltipScrollable } from './utils/duplicated';

 export interface HistogramTooltipProps {
  // aligned series frame
@@ -0,0 +1,7 @@
+export { HistogramPanel } from './HistogramPanel';
+export { Histogram, getBucketSize } from './Histogram';
+export { HistogramTooltip, type HistogramTooltipProps } from './HistogramTooltip';
+export { changeToHistogramPanelMigrationHandler } from './migrations';
+export { defaultHistogramConfig } from './config';
+export { originalDataHasHistogram } from './utils';
+export { type Options, type FieldConfig, defaultOptions, defaultFieldConfig } from './panelcfg.gen';
@@ -1,12 +1,7 @@
 import { isNil, omitBy } from 'lodash';

 import { FieldConfigSource, PanelTypeChangedHandler } from '@grafana/data';
-import {
-  LegendDisplayMode,
-  SortOrder,
-  StackingMode,
-  TooltipDisplayMode,
-} from '@grafana/schema/dist/esm/common/common.gen';
+import { LegendDisplayMode, SortOrder, StackingMode, TooltipDisplayMode } from '@grafana/schema';

 import { defaultHistogramConfig } from './config';
 import { FieldConfig as HistogramFieldConfig, Options } from './panelcfg.gen';
@@ -0,0 +1,57 @@
+// Code generated - EDITING IS FUTILE. DO NOT EDIT.
+//
+// Generated by:
+//     public/app/plugins/gen.go
+// Using jennies:
+//     TSTypesJenny
+//     PluginTsTypesJenny
+//
+// Run 'make gen-cue' from repository root to regenerate.
+
+import * as common from '@grafana/schema';
+
+export interface Options extends common.OptionsWithLegend, common.OptionsWithTooltip {
+  /**
+   * Bucket count (approx)
+   */
+  bucketCount?: number;
+  /**
+   * Offset buckets by this amount
+   */
+  bucketOffset?: number;
+  /**
+   * Size of each bucket
+   */
+  bucketSize?: number;
+  /**
+   * Combines multiple series into a single histogram
+   */
+  combine?: boolean;
+}
+
+export const defaultOptions: Partial<Options> = {
+  bucketCount: 30,
+  bucketOffset: 0,
+};
+
+export interface FieldConfig extends common.AxisConfig, common.HideableFieldConfig, common.StackableFieldConfig {
+  /**
+   * Controls the fill opacity of the bars.
+   */
+  fillOpacity?: number;
+  /**
+   * Set the mode of the gradient fill. Fill gradient is based on the line color. To change the color, use the standard color scheme field option.
+   * Gradient appearance is influenced by the Fill opacity setting.
+   */
+  gradientMode?: common.GraphGradientMode;
+  /**
+   * Controls line width of the bars.
+   */
+  lineWidth?: number;
+}
+
+export const defaultFieldConfig: Partial<FieldConfig> = {
+  fillOpacity: 80,
+  gradientMode: common.GraphGradientMode.None,
+  lineWidth: 1,
+};
@@ -0,0 +1,55 @@
+/**
+ * TODO: REMOVE THIS FILE - ARCHITECTURAL DEBT
+ *
+ * This file contains utility functions duplicated from other panel implementations
+ * to enable the Histogram panel to be extracted as a separate package.
+ *
+ * This is a temporary solution. The proper fix is to move these utilities to a
+ * shared location (e.g., @grafana/ui or @grafana/data) so all panels can import
+ * them without cross-panel dependencies.
+ *
+ * DO NOT ADD MORE FUNCTIONS TO THIS FILE.
+ */
+
+import { Field, LinkModel } from '@grafana/data';
+import { TooltipDisplayMode } from '@grafana/schema';
+
+/**
+ * Duplicated from: public/app/plugins/panel/status-history/utils.ts
+ * Original: https://github.com/grafana/grafana/blob/main/public/app/plugins/panel/status-history/utils.ts#L4-L23
+ * TODO: Move to shared location and remove this duplication
+ */
+export const getDataLinks = (field: Field, rowIdx: number) => {
+  const links: Array<LinkModel<Field>> = [];
+
+  if ((field.config.links?.length ?? 0) > 0 && field.getLinks != null) {
+    const v = field.values[rowIdx];
+    const disp = field.display ? field.display(v) : { text: `${v}`, numeric: +v };
+
+    const linkLookup = new Set<string>();
+
+    field.getLinks({ calculatedValue: disp, valueRowIndex: rowIdx }).forEach((link) => {
+      const key = `${link.title}/${link.href}`;
+      if (!linkLookup.has(key)) {
+        links.push(link);
+        linkLookup.add(key);
+      }
+    });
+  }
+
+  return links;
+};
+
+export interface VizTooltipOptions {
+  mode?: TooltipDisplayMode;
+  maxHeight?: number;
+}
+
+/**
+ * Duplicated from: public/app/plugins/panel/timeseries/utils.ts
+ * Original: https://github.com/grafana/grafana/blob/main/public/app/plugins/panel/timeseries/utils.ts#L268-L270
+ * TODO: Move to shared location and remove this duplication
+ */
+export const isTooltipScrollable = (tooltipOptions: VizTooltipOptions) => {
+  return tooltipOptions.mode === TooltipDisplayMode.Multi && tooltipOptions.maxHeight != null;
+};
@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist/cjs",
+    "module": "commonjs",
+    "emitDeclarationOnly": false
+  }
+}
@@ -0,0 +1,14 @@
+{
+  "extends": "../../scripts/tsconfig.base.json",
+  "compilerOptions": {
+    "declaration": true,
+    "jsx": "react-jsx",
+    "baseUrl": "./",
+    "declarationDir": "./dist/types",
+    "emitDeclarationOnly": true,
+    "isolatedModules": true,
+    "rootDirs": ["."]
+  },
+  "exclude": ["dist/**/*"],
+  "include": ["src/**/*.ts*", "../../public/app/types/*.d.ts", "../grafana-ui/src/types/*.d.ts"]
+}
@@ -507,3 +507,15 @@ export {
  type VizTooltipOptions,
  type OptionsWithTooltip,
 } from '@grafana/schema';
+
+// NOTE: Exports needed for @grafana/histogram in-repo plugin package
+export { getStackingGroups, preparePlotData2 } from './components/uPlot/utils';
+export { TooltipHoverMode } from './components/uPlot/plugins/TooltipPlugin2';
+export {
+  VizTooltipContent,
+  VizTooltipFooter,
+  VizTooltipHeader,
+  VizTooltipWrapper,
+  getContentItems,
+  type VizTooltipItem,
+} from './internal';