[EventLog] Populate alert instances view with event log data

resolves elastic#57446

Adds a new API (AlertClient and HTTP endpoint) `getAlertStatus()` which returns
data calculated from the event log.

The data returned in this PR is fairly minimal - just enough to replace the
current instance details view data.  In the future, we can add the following
sorts of things:

- alert execution errors
- counts of alert execution
- sequences of active instance time spans
- if we can get the alert SO into the action execution, we could also
  provide action execution errors

x-pack/plugins/alerts/common/alert_status.ts

@@ -0,0 +1,31 @@
+/*
+ * 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.
+ */
+
+type AlertStatusValues = 'OK' | 'Active' | 'Error';
+type AlertInstanceStatusValues = 'OK' | 'Active';
+
+export interface AlertStatus {
+  id: string;
+  name: string;
+  tags: string[];
+  alertTypeId: string;
+  consumer: string;
+  muteAll: boolean;
+  throttle: string | null;
+  enabled: boolean;
+  statusStartDate: string;
+  statusEndDate: string;
+  status: AlertStatusValues;
+  lastRun?: string;
+  errorMessages: Array<{ date: string; message: string }>;
+  instances: Record<string, AlertInstanceStatus>;
+}
+
+export interface AlertInstanceStatus {
+  status: AlertInstanceStatusValues;
+  muted: boolean;
+  activeStartDate?: string;
+}

x-pack/plugins/alerts/common/index.ts

@@ -9,6 +9,7 @@ export * from './alert_type';
 export * from './alert_instance';
 export * from './alert_task_instance';
 export * from './alert_navigation';
+export * from './alert_status';
 
 export interface ActionGroup {
   id: string;

x-pack/plugins/alerts/server/alerts_client.mock.ts

@@ -25,6 +25,7 @@ const createAlertsClientMock = () => {
     muteInstance: jest.fn(),
     unmuteInstance: jest.fn(),
     listAlertTypes: jest.fn(),
+    getAlertStatus: jest.fn(),
   };
   return mocked;
 };

x-pack/plugins/alerts/server/alerts_client.test.ts

@@ -11,16 +11,22 @@ import { taskManagerMock } from '../../task_manager/server/task_manager.mock';
 import { alertTypeRegistryMock } from './alert_type_registry.mock';
 import { alertsAuthorizationMock } from './authorization/alerts_authorization.mock';
 import { TaskStatus } from '../../task_manager/server';
-import { IntervalSchedule } from './types';
+import { IntervalSchedule, RawAlert } from './types';
 import { resolvable } from './test_utils';
 import { encryptedSavedObjectsMock } from '../../encrypted_saved_objects/server/mocks';
 import { actionsClientMock, actionsAuthorizationMock } from '../../actions/server/mocks';
 import { AlertsAuthorization } from './authorization/alerts_authorization';
 import { ActionsAuthorization } from '../../actions/server';
+import { eventLogClientMock } from '../../event_log/server/mocks';
+import { QueryEventsBySavedObjectResult } from '../../event_log/server';
+import { SavedObject } from 'kibana/server';
+import { EventsFactory } from './lib/alert_status_from_event_log.test';
 
 const taskManager = taskManagerMock.start();
 const alertTypeRegistry = alertTypeRegistryMock.create();
 const unsecuredSavedObjectsClient = savedObjectsClientMock.create();
+const eventLogClient = eventLogClientMock.create();
+
 const encryptedSavedObjects = encryptedSavedObjectsMock.createClient();
 const authorization = alertsAuthorizationMock.create();
 const actionsAuthorization = actionsAuthorizationMock.create();
@@ -39,6 +45,7 @@ const alertsClientParams: jest.Mocked<ConstructorOptions> = {
   logger: loggingSystemMock.create().get(),
   encryptedSavedObjectsClient: encryptedSavedObjects,
   getActionsClient: jest.fn(),
+  getEventLogClient: jest.fn(),
 };
 
 beforeEach(() => {
@@ -91,17 +98,33 @@ beforeEach(() => {
     async executor() {},
     producer: 'alerts',
   }));
+  alertsClientParams.getEventLogClient.mockResolvedValue(eventLogClient);
 });
 
-const mockedDate = new Date('2019-02-12T21:01:22.479Z');
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const mockedDateString = '2019-02-12T21:01:22.479Z';
+const mockedDate = new Date(mockedDateString);
+const DateOriginal = Date;
+
+// A version of date that responds to `new Date(null|undefined)` and `Date.now()`
+// by returning a fixed date, otherwise should be same as Date.
+/* eslint-disable-next-line @typescript-eslint/no-explicit-any */
 (global as any).Date = class Date {
-  constructor() {
-    return mockedDate;
+  constructor(...args: unknown[]) {
+    // sometimes the ctor has no args, sometimes has a single `null` arg
+    if (args[0] == null) {
+      // @ts-ignore
+      return mockedDate;
+    } else {
+      // @ts-ignore
+      return new DateOriginal(...args);
+    }
   }
   static now() {
     return mockedDate.getTime();
   }
+  static parse(string: string) {
+    return DateOriginal.parse(string);
+  }
 };
 
 function getMockData(overwrites: Record<string, unknown> = {}): CreateOptions['data'] {
@@ -2295,6 +2318,219 @@ describe('getAlertState()', () => {
   });
 });
 
+const AlertStatusFindEventsResult: QueryEventsBySavedObjectResult = {
+  page: 1,
+  per_page: 10000,
+  total: 0,
+  data: [],
+};
+
+const AlertStatusIntervalSeconds = 1;
+
+const BaseAlertStatusSavedObject: SavedObject<RawAlert> = {
+  id: '1',
+  type: 'alert',
+  attributes: {
+    enabled: true,
+    name: 'alert-name',
+    tags: ['tag-1', 'tag-2'],
+    alertTypeId: '123',
+    consumer: 'alert-consumer',
+    schedule: { interval: `${AlertStatusIntervalSeconds}s` },
+    actions: [],
+    params: {},
+    createdBy: null,
+    updatedBy: null,
+    createdAt: mockedDateString,
+    apiKey: null,
+    apiKeyOwner: null,
+    throttle: null,
+    muteAll: false,
+    mutedInstanceIds: [],
+  },
+  references: [],
+};
+
+function getAlertStatusSavedObject(attributes: Partial<RawAlert> = {}): SavedObject<RawAlert> {
+  return {
+    ...BaseAlertStatusSavedObject,
+    attributes: { ...BaseAlertStatusSavedObject.attributes, ...attributes },
+  };
+}
+
+describe('getAlertStatus()', () => {
+  let alertsClient: AlertsClient;
+
+  beforeEach(() => {
+    alertsClient = new AlertsClient(alertsClientParams);
+  });
+
+  test('runs as expected with some event log data', async () => {
+    const alertSO = getAlertStatusSavedObject({ mutedInstanceIds: ['instance-muted-no-activity'] });
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(alertSO);
+
+    const eventsFactory = new EventsFactory(mockedDateString);
+    const events = eventsFactory
+      .addExecute()
+      .addNewInstance('instance-currently-active')
+      .addNewInstance('instance-previously-active')
+      .addActiveInstance('instance-currently-active')
+      .addActiveInstance('instance-previously-active')
+      .advanceTime(10000)
+      .addExecute()
+      .addResolvedInstance('instance-previously-active')
+      .addActiveInstance('instance-currently-active')
+      .getEvents();
+    const eventsResult = {
+      ...AlertStatusFindEventsResult,
+      total: events.length,
+      data: events,
+    };
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(eventsResult);
+
+    const dateStart = new Date(Date.now() - 60 * 1000).toISOString();
+
+    const result = await alertsClient.getAlertStatus({ id: '1', dateStart });
+    expect(result).toMatchInlineSnapshot(`
+      Object {
+        "alertTypeId": "123",
+        "consumer": "alert-consumer",
+        "enabled": true,
+        "errorMessages": Array [],
+        "id": "1",
+        "instances": Object {
+          "instance-currently-active": Object {
+            "activeStartDate": "2019-02-12T21:01:22.479Z",
+            "muted": false,
+            "status": "Active",
+          },
+          "instance-muted-no-activity": Object {
+            "activeStartDate": undefined,
+            "muted": true,
+            "status": "OK",
+          },
+          "instance-previously-active": Object {
+            "activeStartDate": undefined,
+            "muted": false,
+            "status": "OK",
+          },
+        },
+        "lastRun": "2019-02-12T21:01:32.479Z",
+        "muteAll": false,
+        "name": "alert-name",
+        "status": "Active",
+        "statusEndDate": "2019-02-12T21:01:22.479Z",
+        "statusStartDate": "2019-02-12T21:00:22.479Z",
+        "tags": Array [
+          "tag-1",
+          "tag-2",
+        ],
+        "throttle": null,
+      }
+    `);
+  });
+
+  // Further tests don't check the result of `getAlertStatus()`, as the result
+  // is just the result from the `alertStatusFromEventLog()`, which itself
+  // has a complete set of tests.  These tests just make sure the data gets
+  // sent into `getAlertStatus()` as appropriate.
+
+  test('calls saved objects and event log client with default params', async () => {
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(getAlertStatusSavedObject());
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(AlertStatusFindEventsResult);
+
+    await alertsClient.getAlertStatus({ id: '1' });
+
+    expect(unsecuredSavedObjectsClient.get).toHaveBeenCalledTimes(1);
+    expect(eventLogClient.findEventsBySavedObject).toHaveBeenCalledTimes(1);
+    expect(eventLogClient.findEventsBySavedObject.mock.calls[0]).toMatchInlineSnapshot(`
+      Array [
+        "alert",
+        "1",
+        Object {
+          "end": "2019-02-12T21:01:22.479Z",
+          "page": 1,
+          "per_page": 10000,
+          "sort_order": "desc",
+          "start": "2019-02-12T21:00:22.479Z",
+        },
+      ]
+    `);
+    // calculate the expected start/end date for one test
+    const { start, end } = eventLogClient.findEventsBySavedObject.mock.calls[0][2]!;
+    expect(end).toBe(mockedDateString);
+
+    const startMillis = Date.parse(start!);
+    const endMillis = Date.parse(end!);
+    const expectedDuration = 60 * AlertStatusIntervalSeconds * 1000;
+    expect(endMillis - startMillis).toBeGreaterThan(expectedDuration - 2);
+    expect(endMillis - startMillis).toBeLessThan(expectedDuration + 2);
+  });
+
+  test('calls event log client with start date', async () => {
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(getAlertStatusSavedObject());
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(AlertStatusFindEventsResult);
+
+    const dateStart = new Date(Date.now() - 60 * AlertStatusIntervalSeconds * 1000).toISOString();
+    await alertsClient.getAlertStatus({ id: '1', dateStart });
+
+    expect(unsecuredSavedObjectsClient.get).toHaveBeenCalledTimes(1);
+    expect(eventLogClient.findEventsBySavedObject).toHaveBeenCalledTimes(1);
+    const { start, end } = eventLogClient.findEventsBySavedObject.mock.calls[0][2]!;
+
+    expect({ start, end }).toMatchInlineSnapshot(`
+      Object {
+        "end": "2019-02-12T21:01:22.479Z",
+        "start": "2019-02-12T21:00:22.479Z",
+      }
+    `);
+  });
+
+  test('calls event log client with relative start date', async () => {
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(getAlertStatusSavedObject());
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(AlertStatusFindEventsResult);
+
+    const dateStart = '2m';
+    await alertsClient.getAlertStatus({ id: '1', dateStart });
+
+    expect(unsecuredSavedObjectsClient.get).toHaveBeenCalledTimes(1);
+    expect(eventLogClient.findEventsBySavedObject).toHaveBeenCalledTimes(1);
+    const { start, end } = eventLogClient.findEventsBySavedObject.mock.calls[0][2]!;
+
+    expect({ start, end }).toMatchInlineSnapshot(`
+      Object {
+        "end": "2019-02-12T21:01:22.479Z",
+        "start": "2019-02-12T20:59:22.479Z",
+      }
+    `);
+  });
+
+  test('invalid start date throws an error', async () => {
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(getAlertStatusSavedObject());
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(AlertStatusFindEventsResult);
+
+    const dateStart = 'ain"t no way this will get parsed as a date';
+    expect(alertsClient.getAlertStatus({ id: '1', dateStart })).rejects.toMatchInlineSnapshot(
+      `[Error: Invalid date for parameter dateStart: "ain"t no way this will get parsed as a date"]`
+    );
+  });
+
+  test('saved object get throws an error', async () => {
+    unsecuredSavedObjectsClient.get.mockRejectedValueOnce(new Error('OMG!'));
+    eventLogClient.findEventsBySavedObject.mockResolvedValueOnce(AlertStatusFindEventsResult);
+
+    expect(alertsClient.getAlertStatus({ id: '1' })).rejects.toMatchInlineSnapshot(`[Error: OMG!]`);
+  });
+
+  test('findEvents throws an error', async () => {
+    unsecuredSavedObjectsClient.get.mockResolvedValueOnce(getAlertStatusSavedObject());
+    eventLogClient.findEventsBySavedObject.mockRejectedValueOnce(new Error('OMG 2!'));
+
+    // error eaten but logged
+    await alertsClient.getAlertStatus({ id: '1' });
+  });
+});
+
 describe('find()', () => {
   const listedTypes = new Set([
     {