[Ingest Pipelines] Error messages (elastic#70167)

* improved error messages

* traverse recursive error struct

* add check for object with keys

* update button position and copy

* size adjustments

* Refactor i18n texts and change wording

Also added missing translation and refactored maximum errors in
collapsed state to external constant

* use io-ts, add CIT and unit tests

* refactor error utilities to separate file

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/plugins/ingest_pipelines/__jest__/client_integration/fixtures.ts

@@ -0,0 +1,117 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+export const nestedProcessorsErrorFixture = {
+  attributes: {
+    error: {
+      root_cause: [
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+          suppressed: [
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+            },
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+              suppressed: [
+                {
+                  type: 'parse_exception',
+                  reason: '[field] required property is missing',
+                  property_name: 'field',
+                  processor_type: 'csv',
+                },
+              ],
+            },
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+            },
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+            },
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+            },
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'circle',
+            },
+          ],
+        },
+      ],
+      type: 'parse_exception',
+      reason: '[field] required property is missing',
+      property_name: 'field',
+      processor_type: 'circle',
+      suppressed: [
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+        },
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+          suppressed: [
+            {
+              type: 'parse_exception',
+              reason: '[field] required property is missing',
+              property_name: 'field',
+              processor_type: 'csv',
+            },
+          ],
+        },
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+        },
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+        },
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+        },
+        {
+          type: 'parse_exception',
+          reason: '[field] required property is missing',
+          property_name: 'field',
+          processor_type: 'circle',
+        },
+      ],
+    },
+    status: 400,
+  },
+};

x-pack/plugins/ingest_pipelines/__jest__/client_integration/helpers/pipeline_form.helpers.ts

@@ -42,6 +42,8 @@ export type PipelineFormTestSubjects =
   | 'submitButton'
   | 'pageTitle'
   | 'savePipelineError'
+  | 'savePipelineError.showErrorsButton'
+  | 'savePipelineError.hideErrorsButton'
   | 'pipelineForm'
   | 'versionToggle'
   | 'versionField'

x-pack/plugins/ingest_pipelines/__jest__/client_integration/ingest_pipelines_create.test.tsx

@@ -9,6 +9,8 @@ import { act } from 'react-dom/test-utils';
 import { setupEnvironment, pageHelpers, nextTick } from './helpers';
 import { PipelinesCreateTestBed } from './helpers/pipelines_create.helpers';
 
+import { nestedProcessorsErrorFixture } from './fixtures';
+
 const { setup } = pageHelpers.pipelinesCreate;
 
 jest.mock('@elastic/eui', () => {
@@ -163,6 +165,25 @@ describe('<PipelinesCreate />', () => {
         expect(exists('savePipelineError')).toBe(true);
         expect(find('savePipelineError').text()).toContain(error.message);
       });
+
+      test('displays nested pipeline errors as a flat list', async () => {
+        const { actions, find, exists, waitFor } = testBed;
+        httpRequestsMockHelpers.setCreatePipelineResponse(undefined, {
+          body: nestedProcessorsErrorFixture,
+        });
+
+        await act(async () => {
+          actions.clickSubmitButton();
+          await waitFor('savePipelineError');
+        });
+
+        expect(exists('savePipelineError')).toBe(true);
+        expect(exists('savePipelineError.showErrorsButton')).toBe(true);
+        find('savePipelineError.showErrorsButton').simulate('click');
+        expect(exists('savePipelineError.hideErrorsButton')).toBe(true);
+        expect(exists('savePipelineError.showErrorsButton')).toBe(false);
+        expect(find('savePipelineError').find('li').length).toBe(8);
+      });
     });
 
     describe('test pipeline', () => {

x-pack/plugins/ingest_pipelines/public/application/components/pipeline_form/pipeline_form.tsx

@@ -11,17 +11,18 @@ import { EuiButton, EuiButtonEmpty, EuiFlexGroup, EuiFlexItem, EuiSpacer } from
 import { useForm, Form, FormConfig } from '../../../shared_imports';
 import { Pipeline } from '../../../../common/types';
 
-import { PipelineRequestFlyout } from './pipeline_request_flyout';
-import { PipelineTestFlyout } from './pipeline_test_flyout';
-import { PipelineFormFields } from './pipeline_form_fields';
-import { PipelineFormError } from './pipeline_form_error';
-import { pipelineFormSchema } from './schema';
 import {
   OnUpdateHandlerArg,
   OnUpdateHandler,
   SerializeResult,
 } from '../pipeline_processors_editor';
 
+import { PipelineRequestFlyout } from './pipeline_request_flyout';
+import { PipelineTestFlyout } from './pipeline_test_flyout';
+import { PipelineFormFields } from './pipeline_form_fields';
+import { PipelineFormError } from './pipeline_form_error';
+import { pipelineFormSchema } from './schema';
+
 export interface PipelineFormProps {
   onSave: (pipeline: Pipeline) => void;
   onCancel: () => void;
@@ -116,7 +117,7 @@ export const PipelineForm: React.FunctionComponent<PipelineFormProps> = ({
         error={form.getErrors()}
       >
         {/* Request error */}
-        {saveError && <PipelineFormError errorMessage={saveError.message} />}
+        {saveError && <PipelineFormError error={saveError} />}
 
         {/* All form fields */}
         <PipelineFormFields

x-pack/plugins/ingest_pipelines/public/application/components/pipeline_form/pipeline_form_error/error_utils.test.ts

@@ -0,0 +1,67 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { toKnownError } from './error_utils';
+import { nestedProcessorsErrorFixture } from '../../../../../__jest__/client_integration/fixtures';
+
+describe('toKnownError', () => {
+  test('undefined, null, numbers, arrays and bad objects', () => {
+    expect(toKnownError(undefined)).toEqual({ errors: [{ reason: 'An unknown error occurred.' }] });
+    expect(toKnownError(null)).toEqual({ errors: [{ reason: 'An unknown error occurred.' }] });
+    expect(toKnownError(123)).toEqual({ errors: [{ reason: 'An unknown error occurred.' }] });
+    expect(toKnownError([])).toEqual({ errors: [{ reason: 'An unknown error occurred.' }] });
+    expect(toKnownError({})).toEqual({ errors: [{ reason: 'An unknown error occurred.' }] });
+    expect(toKnownError({ attributes: {} })).toEqual({
+      errors: [{ reason: 'An unknown error occurred.' }],
+    });
+  });
+
+  test('non-processors errors', () => {
+    expect(toKnownError(new Error('my error'))).toEqual({ errors: [{ reason: 'my error' }] });
+    expect(toKnownError({ message: 'my error' })).toEqual({ errors: [{ reason: 'my error' }] });
+  });
+
+  test('processors errors', () => {
+    expect(toKnownError(nestedProcessorsErrorFixture)).toMatchInlineSnapshot(`
+      Object {
+        "errors": Array [
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "csv",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+          Object {
+            "processorType": "circle",
+            "reason": "[field] required property is missing",
+          },
+        ],
+      }
+    `);
+  });
+});

x-pack/plugins/ingest_pipelines/public/application/components/pipeline_form/pipeline_form_error/error_utils.ts

@@ -0,0 +1,85 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import * as t from 'io-ts';
+import { flow } from 'fp-ts/lib/function';
+import { isRight } from 'fp-ts/lib/Either';
+
+import { i18nTexts } from './i18n_texts';
+
+export interface PipelineError {
+  reason: string;
+  processorType?: string;
+}
+interface PipelineErrors {
+  errors: PipelineError[];
+}
+
+interface ErrorNode {
+  reason: string;
+  processor_type?: string;
+  suppressed?: ErrorNode[];
+}
+
+// This is a runtime type (RT) for an error node which is a recursive type
+const errorNodeRT = t.recursion<ErrorNode>('ErrorNode', (ErrorNode) =>
+  t.intersection([
+    t.interface({
+      reason: t.string,
+    }),
+    t.partial({
+      processor_type: t.string,
+      suppressed: t.array(ErrorNode),
+    }),
+  ])
+);
+
+// This is a runtime type for the attributes object we expect to receive from the server
+// for processor errors
+const errorAttributesObjectRT = t.interface({
+  attributes: t.interface({
+    error: t.interface({
+      root_cause: t.array(errorNodeRT),
+    }),
+  }),
+});
+
+const isProcessorsError = flow(errorAttributesObjectRT.decode, isRight);
+
+type ErrorAttributesObject = t.TypeOf<typeof errorAttributesObjectRT>;
+
+const flattenErrorsTree = (node: ErrorNode): PipelineError[] => {
+  const result: PipelineError[] = [];
+  const recurse = (_node: ErrorNode) => {
+    result.push({ reason: _node.reason, processorType: _node.processor_type });
+    if (_node.suppressed && Array.isArray(_node.suppressed)) {
+      _node.suppressed.forEach(recurse);
+    }
+  };
+  recurse(node);
+  return result;
+};
+
+export const toKnownError = (error: unknown): PipelineErrors => {
+  if (typeof error === 'object' && error != null && isProcessorsError(error)) {
+    const errorAttributes = error as ErrorAttributesObject;
+    const rootCause = errorAttributes.attributes.error.root_cause[0];
+    return { errors: flattenErrorsTree(rootCause) };
+  }
+
+  if (typeof error === 'string') {
+    return { errors: [{ reason: error }] };
+  }
+
+  if (
+    error instanceof Error ||
+    (typeof error === 'object' && error != null && (error as any).message)
+  ) {
+    return { errors: [{ reason: (error as any).message }] };
+  }
+
+  return { errors: [{ reason: i18nTexts.errors.unknownError }] };
+};