Add rolling upgrade interstitials to UA

x-pack/plugins/upgrade_assistant/__jest__/client_integration/app/app.helpers.tsx

@@ -0,0 +1,50 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { act } from 'react-dom/test-utils';
+import { registerTestBed, TestBed, TestBedConfig } from '@kbn/test/jest';
+
+import { App } from '../../../public/application/app';
+import { WithAppDependencies } from '../helpers';
+
+const testBedConfig: TestBedConfig = {
+  memoryRouter: {
+    initialEntries: [`/overview`],
+    componentRoutePath: '/overview',
+  },
+  doMountAsync: true,
+};
+
+export type AppTestBed = TestBed & {
+  actions: ReturnType<typeof createActions>;
+};
+
+const createActions = (testBed: TestBed) => {
+  const clickDeprecationToggle = async () => {
+    const { find, component } = testBed;
+
+    await act(async () => {
+      find('deprecationLoggingToggle').simulate('click');
+    });
+
+    component.update();
+  };
+
+  return {
+    clickDeprecationToggle,
+  };
+};
+
+export const setupAppPage = async (overrides?: Record<string, unknown>): Promise<AppTestBed> => {
+  const initTestBed = registerTestBed(WithAppDependencies(App, overrides), testBedConfig);
+  const testBed = await initTestBed();
+
+  return {
+    ...testBed,
+    actions: createActions(testBed),
+  };
+};

x-pack/plugins/upgrade_assistant/__jest__/client_integration/app/cluster_upgrade.test.tsx

@@ -0,0 +1,86 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import { act } from 'react-dom/test-utils';
+
+import { setupEnvironment } from '../helpers';
+import { AppTestBed, setupAppPage } from './app.helpers';
+
+describe('Cluster upgrade', () => {
+  let testBed: AppTestBed;
+  let server: ReturnType<typeof setupEnvironment>['server'];
+  let httpRequestsMockHelpers: ReturnType<typeof setupEnvironment>['httpRequestsMockHelpers'];
+
+  beforeEach(() => {
+    ({ server, httpRequestsMockHelpers } = setupEnvironment());
+  });
+
+  afterEach(() => {
+    server.restore();
+  });
+
+  describe('when user is still preparing for upgrade', () => {
+    beforeEach(async () => {
+      testBed = await setupAppPage();
+    });
+
+    test('renders overview', () => {
+      const { exists } = testBed;
+      expect(exists('overview')).toBe(true);
+      expect(exists('isUpgradingMessage')).toBe(false);
+      expect(exists('isUpgradeCompleteMessage')).toBe(false);
+    });
+  });
+
+  describe('when cluster is in the process of a rolling upgrade', () => {
+    beforeEach(async () => {
+      httpRequestsMockHelpers.setLoadDeprecationLoggingResponse(undefined, {
+        statusCode: 426,
+        message: '',
+        attributes: {
+          allNodesUpgraded: false,
+        },
+      });
+
+      await act(async () => {
+        testBed = await setupAppPage();
+      });
+    });
+
+    test('renders rolling upgrade message', async () => {
+      const { component, exists } = testBed;
+      component.update();
+      expect(exists('overview')).toBe(false);
+      expect(exists('isUpgradingMessage')).toBe(true);
+      expect(exists('isUpgradeCompleteMessage')).toBe(false);
+    });
+  });
+
+  describe('when cluster has been upgraded', () => {
+    beforeEach(async () => {
+      httpRequestsMockHelpers.setLoadDeprecationLoggingResponse(undefined, {
+        statusCode: 426,
+        message: '',
+        attributes: {
+          allNodesUpgraded: true,
+        },
+      });
+
+      await act(async () => {
+        testBed = await setupAppPage();
+      });
+    });
+
+    test('renders upgrade complete message', () => {
+      const { component, exists } = testBed;
+      component.update();
+      expect(exists('overview')).toBe(false);
+      expect(exists('isUpgradingMessage')).toBe(false);
+      expect(exists('isUpgradeCompleteMessage')).toBe(true);
+    });
+  });
+});

x-pack/plugins/upgrade_assistant/__jest__/client_integration/helpers/app_context.mock.ts

@@ -80,4 +80,7 @@ export const getAppContextMock = () => ({
       isCloudEnabled: false,
     },
   },
+  clusterUpgradeState: 'isPreparingForUpgrade',
+  isClusterUpgradeStateError: () => {},
+  handleClusterUpgradeStateError: () => {},
 });

x-pack/plugins/upgrade_assistant/__jest__/client_integration/helpers/http_requests.ts

@@ -6,13 +6,14 @@
  */
 
 import sinon, { SinonFakeServer } from 'sinon';
+
 import { API_BASE_PATH } from '../../../common/constants';
 import {
   CloudBackupStatus,
   ESUpgradeStatus,
   DeprecationLoggingStatus,
+  ResponseError,
 } from '../../../common/types';
-import { ResponseError } from '../../../public/application/lib/api';
 
 // Register helpers to mock HTTP Requests
 const registerHttpRequestMockHelpers = (server: SinonFakeServer) => {

x-pack/plugins/upgrade_assistant/common/constants.ts

@@ -38,6 +38,7 @@ export const DEPRECATION_LOGS_SOURCE_ID = 'deprecation_logs';
 export const DEPRECATION_LOGS_INDEX = '.logs-deprecation.elasticsearch-default';
 export const DEPRECATION_LOGS_INDEX_PATTERN = '.logs-deprecation.elasticsearch-default';
 
+export const CLUSTER_UPGRADE_STATUS_POLL_INTERVAL_MS = 45000;
 export const CLOUD_BACKUP_STATUS_POLL_INTERVAL_MS = 60000;
 export const DEPRECATION_LOGS_COUNT_POLL_INTERVAL_MS = 15000;
 export const SYSTEM_INDICES_MIGRATION_POLL_INTERVAL_MS = 15000;

x-pack/plugins/upgrade_assistant/common/types.ts

@@ -13,6 +13,16 @@ import { SavedObject, SavedObjectAttributes } from 'src/core/public';
 
 export type DeprecationSource = 'Kibana' | 'Elasticsearch';
 
+export type ClusterUpgradeState = 'isPreparingForUpgrade' | 'isUpgrading' | 'isUpgradeComplete';
+
+export interface ResponseError {
+  statusCode: number;
+  message: string | Error;
+  attributes?: {
+    allNodesUpgraded: boolean;
+  };
+}
+
 export enum ReindexStep {
   // Enum values are spaced out by 10 to give us room to insert steps in between.
   created = 0,

x-pack/plugins/upgrade_assistant/public/application/app.tsx

@@ -5,27 +5,109 @@
  * 2.0.
  */
 
-import React from 'react';
+import React, { useState, useEffect } from 'react';
 import { Router, Switch, Route, Redirect } from 'react-router-dom';
+import { FormattedMessage } from '@kbn/i18n/react';
+import { EuiEmptyPrompt, EuiPageContent, EuiLoadingSpinner } from '@elastic/eui';
 import { ScopedHistory } from 'src/core/public';
 
 import { RedirectAppLinks } from '../../../../../src/plugins/kibana_react/public';
+import { API_BASE_PATH } from '../../common/constants';
+import { ClusterUpgradeState } from '../../common/types';
 import { APP_WRAPPER_CLASS, GlobalFlyout, AuthorizationProvider } from '../shared_imports';
 import { AppDependencies } from '../types';
-import { API_BASE_PATH } from '../../common/constants';
 import { AppContextProvider, useAppContext } from './app_context';
 import { EsDeprecations, ComingSoonPrompt, KibanaDeprecations, Overview } from './components';
 
 const { GlobalFlyoutProvider } = GlobalFlyout;
 
-const App: React.FunctionComponent = () => {
-  const { isReadOnlyMode } = useAppContext();
+const AppHandlingClusterUpgradeState: React.FunctionComponent = () => {
+  const {
+    isReadOnlyMode,
+    services: { api },
+  } = useAppContext();
+
+  const [clusterUpgradeState, setClusterUpradeState] =
+    useState<ClusterUpgradeState>('isPreparingForUpgrade');
+
+  useEffect(() => {
+    api.onClusterUpgradeStateChange((newClusterUpgradeState: ClusterUpgradeState) => {
+      setClusterUpradeState(newClusterUpgradeState);
+    });
+  }, [api]);
 
   // Read-only mode will be enabled up until the last minor before the next major release
   if (isReadOnlyMode) {
     return <ComingSoonPrompt />;
   }
 
+  if (clusterUpgradeState === 'isUpgrading') {
+    return (
+      <EuiPageContent
+        hasShadow={false}
+        paddingSize="none"
+        verticalPosition="center"
+        horizontalPosition="center"
+        data-test-subj="isUpgradingMessage"
+      >
+        <EuiEmptyPrompt
+          iconType="logoElasticsearch"
+          title={
+            <h1>
+              <FormattedMessage
+                id="xpack.upgradeAssistant.upgradingTitle"
+                defaultMessage="Your cluster is upgrading"
+              />
+            </h1>
+          }
+          body={
+            <p>
+              <FormattedMessage
+                id="xpack.upgradeAssistant.upgradingDescription"
+                defaultMessage="One or more Elasticsearch nodes have a newer version of
+                Elasticsearch than Kibana. Once all your nodes are upgraded, upgrade Kibana."
+              />
+            </p>
+          }
+          data-test-subj="emptyPrompt"
+        />
+      </EuiPageContent>
+    );
+  }
+
+  if (clusterUpgradeState === 'isUpgradeComplete') {
+    return (
+      <EuiPageContent
+        hasShadow={false}
+        paddingSize="none"
+        verticalPosition="center"
+        horizontalPosition="center"
+        data-test-subj="isUpgradeCompleteMessage"
+      >
+        <EuiEmptyPrompt
+          iconType="logoElasticsearch"
+          title={
+            <h1>
+              <FormattedMessage
+                id="xpack.upgradeAssistant.upgradedTitle"
+                defaultMessage="Your cluster has been upgraded"
+              />
+            </h1>
+          }
+          body={
+            <p>
+              <FormattedMessage
+                id="xpack.upgradeAssistant.upgradedDescription"
+                defaultMessage="All Elasticsearch nodes have been upgraded. You may now upgrade Kibana."
+              />
+            </p>
+          }
+          data-test-subj="emptyPrompt"
+        />
+      </EuiPageContent>
+    );
+  }
+
   return (
     <Switch>
       <Route exact path="/overview" component={Overview} />
@@ -36,10 +118,37 @@ const App: React.FunctionComponent = () => {
   );
 };
 
-export const AppWithRouter = ({ history }: { history: ScopedHistory }) => {
+export const App = ({ history }: { history: ScopedHistory }) => {
+  const {
+    services: { api },
+  } = useAppContext();
+
+  // Poll the API to detect when the cluster is either in the middle of
+  // a rolling upgrade or has completed one. We need to create two separate
+  // components: one to call this hook and one to handle state changes.
+  // This is because the implementation of this hook calls the state-change
+  // callbacks on every render, which will get the UI stuck in an infinite
+  // render loop if the same component both called the hook and handled
+  // the state changes it triggers.
+  const { isLoading, isInitialRequest } = api.useLoadClusterUpgradeStatus();
+
+  // Prevent flicker of the underlying UI while we wait for the status to fetch.
+  if (isLoading && isInitialRequest) {
+    return (
+      <EuiPageContent
+        hasShadow={false}
+        paddingSize="none"
+        verticalPosition="center"
+        horizontalPosition="center"
+      >
+        <EuiEmptyPrompt body={<EuiLoadingSpinner size="l" />} />
+      </EuiPageContent>
+    );
+  }
+
   return (
     <Router history={history}>
-      <App />
+      <AppHandlingClusterUpgradeState />
     </Router>
   );
 };
@@ -56,7 +165,7 @@ export const RootComponent = (dependencies: AppDependencies) => {
         <i18n.Context>
           <AppContextProvider value={dependencies}>
             <GlobalFlyoutProvider>
-              <AppWithRouter history={history} />
+              <App history={history} />
             </GlobalFlyoutProvider>
           </AppContextProvider>
         </i18n.Context>

x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/flyout.tsx

@@ -23,8 +23,12 @@ import {
   EuiSpacer,
   EuiCallOut,
 } from '@elastic/eui';
-import { EnrichedDeprecationInfo, IndexSettingAction } from '../../../../../../common/types';
-import type { ResponseError } from '../../../../lib/api';
+
+import {
+  EnrichedDeprecationInfo,
+  IndexSettingAction,
+  ResponseError,
+} from '../../../../../../common/types';
 import type { Status } from '../../../types';
 import { DeprecationBadge } from '../../../shared';
 

x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/index_settings/table_row.tsx

@@ -7,10 +7,9 @@
 
 import React, { useState, useEffect, useCallback } from 'react';
 import { EuiTableRowCell } from '@elastic/eui';
-import { EnrichedDeprecationInfo } from '../../../../../../common/types';
+import { EnrichedDeprecationInfo, ResponseError } from '../../../../../../common/types';
 import { GlobalFlyout } from '../../../../../shared_imports';
 import { useAppContext } from '../../../../app_context';
-import type { ResponseError } from '../../../../lib/api';
 import { EsDeprecationsTableCells } from '../../es_deprecations_table_cells';
 import { DeprecationTableColumns, Status } from '../../../types';
 import { IndexSettingsResolutionCell } from './resolution_table_cell';

x-pack/plugins/upgrade_assistant/public/application/components/es_deprecations/deprecation_types/ml_snapshots/use_snapshot_state.tsx

@@ -7,7 +7,8 @@
 
 import { useRef, useCallback, useState, useEffect } from 'react';
 
-import { ApiService, ResponseError } from '../../../../lib/api';
+import { ResponseError } from '../../../../../../common/types';
+import { ApiService } from '../../../../lib/api';
 import { Status } from '../../../types';
 
 const POLL_INTERVAL_MS = 1000;