Transformer: Rename metrics based on regex (#29281)

* Grafana: Rename By Regex Transformer

* Removing unused deps

* Add scrollIntoView() to TranformTab.content()

* Exporting RenameByRegexTransformerOptions

* Add doc block to renameByRegex transformer

* Adding doc block for RenameByRegexTransformerOptions

* removing scrollIntoView() for transform tab

* Adding back in scrollIntoView() for transform panel

* Tests: fixes e2e tests

* Apply to displayName instead of just the name of the frame

* Rewrite docblock to match new functionality

* Adding documentation

* Changing TLD to domain name

* Fixing typo

* Update docs/sources/panels/transformations/types-options.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Update docs/sources/panels/transformations/types-options.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Update docs/sources/panels/transformations/types-options.md

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>
Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>

docs/sources/panels/transformations/types-options.md

@@ -19,6 +19,7 @@ Grafana comes with the following transformations:
 - [Concatenate fields](#concatenate-fields)
 - [Group by](#group-by)
 - [Merge](#merge)
+- [Rename by regex](#rename-by-regex)
 
 Keep reading for detailed descriptions of each type of transformation and the options available for each, as well as suggestions on how to use them.
 
@@ -398,3 +399,17 @@ When you have more than one condition, you can choose if you want the action (in
 In the example above we chose **Match all** because we wanted to include the rows that have a temperature lower than 30 _AND_ an altitude higher than 100. If we wanted to include the rows that have a temperature lower than 30 _OR_ an altitude higher than 100 instead, then we would select **Match any**. This would include the first row in the original data, which has a temperature of 32°C (does not match the first condition) but an altitude of 101 (which matches the second condition), so it is included.
 
 Conditions that are invalid or incompletely configured are ignored.
+
+## Rename by regex
+
+Use this transformation to rename parts of the query results using a regular expression and replacement pattern.
+
+You can specify a regular expression, which is only applied to matches, along with a replacement pattern that support back references. For example, let's imagine you're visualizing CPU usage per host and you want to remove the domain name. You could set the regex to `([^\.]+)\..+` and the replacement pattern to `$1`, `web-01.example.com` would become `web-01`.
+
+In the following example, we are stripping the prefix from event types. In the before image, you can see everything is prefixed with `system.`
+
+{{< docs-imagebox img="/img/docs/transformations/rename-by-regex-before-7-3.png" class="docs-image--no-shadow" max-width= "1100px" >}}
+
+With the transformation applied, you can see we are left with just the remainder of the string.
+
+{{< docs-imagebox img="/img/docs/transformations/rename-by-regex-after-7-3.png" class="docs-image--no-shadow" max-width= "1100px" >}}

packages/grafana-data/src/transformations/index.ts

@@ -10,4 +10,5 @@ export {
   standardTransformersRegistry,
 } from './standardTransformersRegistry';
 export { RegexpOrNamesMatcherOptions } from './matchers/nameMatcher';
+export { RenameByRegexTransformerOptions } from './transformers/renameByRegex';
 export { outerJoinDataFrames } from './transformers/seriesToColumns';

packages/grafana-data/src/transformations/transformers.ts

@@ -14,6 +14,7 @@ import { labelsToFieldsTransformer } from './transformers/labelsToFields';
 import { ensureColumnsTransformer } from './transformers/ensureColumns';
 import { groupByTransformer } from './transformers/groupBy';
 import { mergeTransformer } from './transformers/merge';
+import { renameByRegexTransformer } from './transformers/renameByRegex';
 import { filterByValueTransformer } from './transformers/filterByValue';
 
 export const standardTransformers = {
@@ -35,4 +36,5 @@ export const standardTransformers = {
   ensureColumnsTransformer,
   groupByTransformer,
   mergeTransformer,
+  renameByRegexTransformer,
 };

packages/grafana-data/src/transformations/transformers/ids.ts

@@ -16,6 +16,7 @@ export enum DataTransformerID {
   filterFieldsByName = 'filterFieldsByName',
   filterFrames = 'filterFrames',
   filterByRefId = 'filterByRefId',
+  renameByRegex = 'renameByRegex',
   filterByValue = 'filterByValue',
   noop = 'noop',
   ensureColumns = 'ensureColumns',

packages/grafana-data/src/transformations/transformers/renameByRegex.test.ts

@@ -0,0 +1,180 @@
+import { DataTransformerConfig, DataTransformerID, FieldType, toDataFrame, transformDataFrame } from '@grafana/data';
+import { renameByRegexTransformer, RenameByRegexTransformerOptions } from './renameByRegex';
+import { mockTransformationsRegistry } from '../../utils/tests/mockTransformationsRegistry';
+
+describe('Rename By Regex Transformer', () => {
+  beforeAll(() => {
+    mockTransformationsRegistry([renameByRegexTransformer]);
+  });
+
+  describe('when regex and replacement pattern', () => {
+    const data = toDataFrame({
+      name: 'web-01.example.com',
+      fields: [
+        {
+          name: 'Time',
+          type: FieldType.time,
+          config: { name: 'Time' },
+          values: [3000, 4000, 5000, 6000],
+        },
+        {
+          name: 'Value',
+          type: FieldType.number,
+          config: { displayName: 'web-01.example.com' },
+          values: [10000.3, 10000.4, 10000.5, 10000.6],
+        },
+      ],
+    });
+
+    it('should rename matches using references', async () => {
+      const cfg: DataTransformerConfig<RenameByRegexTransformerOptions> = {
+        id: DataTransformerID.renameByRegex,
+        options: {
+          regex: '([^.]+).example.com',
+          renamePattern: '$1',
+        },
+      };
+      await expect(transformDataFrame([cfg], [data])).toEmitValuesWith(received => {
+        const data = received[0];
+        const frame = data[0];
+        expect(frame.fields).toMatchInlineSnapshot(`
+          Array [
+            Object {
+              "config": Object {
+                "name": "Time",
+              },
+              "name": "Time",
+              "state": Object {
+                "displayName": "Time",
+              },
+              "type": "time",
+              "values": Array [
+                3000,
+                4000,
+                5000,
+                6000,
+              ],
+            },
+            Object {
+              "config": Object {
+                "displayName": "web-01",
+              },
+              "name": "Value",
+              "state": Object {
+                "displayName": "web-01",
+              },
+              "type": "number",
+              "values": Array [
+                10000.3,
+                10000.4,
+                10000.5,
+                10000.6,
+              ],
+            },
+          ]
+        `);
+      });
+    });
+
+    it('should not rename misses', async () => {
+      const cfg: DataTransformerConfig<RenameByRegexTransformerOptions> = {
+        id: DataTransformerID.renameByRegex,
+        options: {
+          regex: '([^.]+).bad-domain.com',
+          renamePattern: '$1',
+        },
+      };
+      await expect(transformDataFrame([cfg], [data])).toEmitValuesWith(received => {
+        const data = received[0];
+        const frame = data[0];
+        expect(frame.fields).toMatchInlineSnapshot(`
+          Array [
+            Object {
+              "config": Object {
+                "name": "Time",
+              },
+              "name": "Time",
+              "state": Object {
+                "displayName": "Time",
+              },
+              "type": "time",
+              "values": Array [
+                3000,
+                4000,
+                5000,
+                6000,
+              ],
+            },
+            Object {
+              "config": Object {
+                "displayName": "web-01.example.com",
+              },
+              "name": "Value",
+              "state": Object {
+                "displayName": "web-01.example.com",
+              },
+              "type": "number",
+              "values": Array [
+                10000.3,
+                10000.4,
+                10000.5,
+                10000.6,
+              ],
+            },
+          ]
+        `);
+      });
+    });
+
+    it('should not rename with empty regex and repacement pattern', async () => {
+      const cfg: DataTransformerConfig<RenameByRegexTransformerOptions> = {
+        id: DataTransformerID.renameByRegex,
+        options: {
+          regex: '',
+          renamePattern: '',
+        },
+      };
+      await expect(transformDataFrame([cfg], [data])).toEmitValuesWith(received => {
+        const data = received[0];
+        const frame = data[0];
+        expect(frame.fields).toMatchInlineSnapshot(`
+          Array [
+            Object {
+              "config": Object {
+                "displayName": "Time",
+                "name": "Time",
+              },
+              "name": "Time",
+              "state": Object {
+                "displayName": "Time",
+              },
+              "type": "time",
+              "values": Array [
+                3000,
+                4000,
+                5000,
+                6000,
+              ],
+            },
+            Object {
+              "config": Object {
+                "displayName": "web-01.example.com",
+              },
+              "name": "Value",
+              "state": Object {
+                "displayName": "web-01.example.com",
+              },
+              "type": "number",
+              "values": Array [
+                10000.3,
+                10000.4,
+                10000.5,
+                10000.6,
+              ],
+            },
+          ]
+        `);
+      });
+    });
+  });
+});

packages/grafana-data/src/transformations/transformers/renameByRegex.ts

@@ -0,0 +1,62 @@
+import { DataTransformerID } from './ids';
+import { DataTransformerInfo } from '../../types/transformations';
+import { map } from 'rxjs/operators';
+import { DataFrame } from '../../types/dataFrame';
+import { getFieldDisplayName } from '../../field/fieldState';
+
+/**
+ * Options for renameByRegexTransformer
+ *
+ * @public
+ */
+export interface RenameByRegexTransformerOptions {
+  regex: string;
+  renamePattern: string;
+}
+
+/**
+ * Replaces the displayName of a field by applying a regular expression
+ * to match the name and a pattern for the replacement.
+ *
+ * @public
+ */
+export const renameByRegexTransformer: DataTransformerInfo<RenameByRegexTransformerOptions> = {
+  id: DataTransformerID.renameByRegex,
+  name: 'Rename fields by regex',
+  description: 'Rename fields based on regular expression by users.',
+  defaultOptions: {
+    regex: '(.*)',
+    renamePattern: '$1',
+  },
+
+  /**
+   * Return a modified copy of the series.  If the transform is not or should not
+   * be applied, just return the input series
+   */
+  operator: options => source =>
+    source.pipe(
+      map(data => {
+        if (!Array.isArray(data) || data.length === 0) {
+          return data;
+        }
+        return data.map(renameFieldsByRegex(options));
+      })
+    ),
+};
+
+const renameFieldsByRegex = (options: RenameByRegexTransformerOptions) => (frame: DataFrame) => {
+  const regex = new RegExp(options.regex);
+  const fields = frame.fields.map(field => {
+    const displayName = getFieldDisplayName(field, frame);
+    if (!regex.test(displayName)) {
+      return field;
+    }
+    const newDisplayName = displayName.replace(regex, options.renamePattern);
+    return {
+      ...field,
+      config: { ...field.config, displayName: newDisplayName },
+      state: { ...field.state, displayName: newDisplayName },
+    };
+  });
+  return { ...frame, fields };
+};

public/app/core/components/TransformersUI/RenameByRegexTransformer.tsx

@@ -0,0 +1,131 @@
+import React from 'react';
+import {
+  DataTransformerID,
+  standardTransformers,
+  TransformerRegistyItem,
+  TransformerUIProps,
+  stringToJsRegex,
+} from '@grafana/data';
+import { Field, Input } from '@grafana/ui';
+import { css } from 'emotion';
+import { RenameByRegexTransformerOptions } from '@grafana/data/src/transformations/transformers/renameByRegex';
+
+interface RenameByRegexTransformerEditorProps extends TransformerUIProps<RenameByRegexTransformerOptions> {}
+
+interface RenameByRegexTransformerEditorState {
+  regex?: string;
+  renamePattern?: string;
+  isRegexValid?: boolean;
+}
+
+export class RenameByRegexTransformerEditor extends React.PureComponent<
+  RenameByRegexTransformerEditorProps,
+  RenameByRegexTransformerEditorState
+> {
+  constructor(props: RenameByRegexTransformerEditorProps) {
+    super(props);
+    this.state = {
+      regex: props.options.regex,
+      renamePattern: props.options.renamePattern,
+      isRegexValid: true,
+    };
+  }
+
+  handleRegexChange = (e: React.FormEvent<HTMLInputElement>) => {
+    const regex = e.currentTarget.value;
+    let isRegexValid = true;
+    if (regex) {
+      try {
+        if (regex) {
+          stringToJsRegex(regex);
+        }
+      } catch (e) {
+        isRegexValid = false;
+      }
+    }
+    this.setState(previous => ({ ...previous, regex, isRegexValid }));
+  };
+
+  handleRenameChange = (e: React.FormEvent<HTMLInputElement>) => {
+    const renamePattern = e.currentTarget.value;
+    this.setState(previous => ({ ...previous, renamePattern }));
+  };
+
+  handleRegexBlur = (e: React.FocusEvent<HTMLInputElement>) => {
+    const regex = e.currentTarget.value;
+    let isRegexValid = true;
+
+    try {
+      if (regex) {
+        stringToJsRegex(regex);
+      }
+    } catch (e) {
+      isRegexValid = false;
+    }
+
+    this.setState({ isRegexValid }, () => {
+      if (isRegexValid) {
+        this.props.onChange({ ...this.props.options, regex });
+      }
+    });
+  };
+
+  handleRenameBlur = (e: React.FocusEvent<HTMLInputElement>) => {
+    const renamePattern = e.currentTarget.value;
+    this.setState({ renamePattern }, () => this.props.onChange({ ...this.props.options, renamePattern }));
+  };
+
+  render() {
+    const { regex, renamePattern, isRegexValid } = this.state;
+    return (
+      <>
+        <div className="gf-form-inline">
+          <div className="gf-form gf-form--grow">
+            <div className="gf-form-label width-8">Match</div>
+            <Field
+              invalid={!isRegexValid}
+              error={!isRegexValid ? 'Invalid pattern' : undefined}
+              className={css`
+                margin-bottom: 0;
+              `}
+            >
+              <Input
+                placeholder="Regular expression pattern"
+                value={regex || ''}
+                onChange={this.handleRegexChange}
+                onBlur={this.handleRegexBlur}
+                width={25}
+              />
+            </Field>
+          </div>
+        </div>
+        <div className="gf-form-inline">
+          <div className="gf-form gf-form--grow">
+            <div className="gf-form-label width-8">Replace</div>
+            <Field
+              className={css`
+                margin-bottom: 0;
+              `}
+            >
+              <Input
+                placeholder="Replacement pattern"
+                value={renamePattern || ''}
+                onChange={this.handleRenameChange}
+                onBlur={this.handleRenameBlur}
+                width={25}
+              />
+            </Field>
+          </div>
+        </div>
+      </>
+    );
+  }
+}
+
+export const renameByRegexTransformRegistryItem: TransformerRegistyItem<RenameByRegexTransformerOptions> = {
+  id: DataTransformerID.renameByRegex,
+  editor: RenameByRegexTransformerEditor,
+  transformation: standardTransformers.renameByRegexTransformer,
+  name: 'Rename by regex',
+  description: 'Renames part of the query result by using regular expression with placeholders.',
+};

public/app/core/utils/standardTransformers.ts

@@ -11,11 +11,13 @@ import { groupByTransformRegistryItem } from '../components/TransformersUI/Group
 import { mergeTransformerRegistryItem } from '../components/TransformersUI/MergeTransformerEditor';
 import { seriesToRowsTransformerRegistryItem } from '../components/TransformersUI/SeriesToRowsTransformerEditor';
 import { concatenateTransformRegistryItem } from '../components/TransformersUI/ConcatenateTransformerEditor';
+import { renameByRegexTransformRegistryItem } from '../components/TransformersUI/RenameByRegexTransformer';
 
 export const getStandardTransformers = (): Array<TransformerRegistyItem<any>> => {
   return [
     reduceTransformRegistryItem,
     filterFieldsByNameTransformRegistryItem,
+    renameByRegexTransformRegistryItem,
     filterFramesByRefIdTransformRegistryItem,
     filterByValueTransformRegistryItem,
     organizeFieldsTransformRegistryItem,