Adds get all REST API to data views

docs/api/data-views.asciidoc

@@ -11,6 +11,7 @@ WARNING: Use the data views APIs for managing data views instead of lower-level
 The following data views APIs are available: 
 
 * Data views
+    ** <<data-views-api-get-all, Get all data views API>> to retrieve a list of data views
     ** <<data-views-api-get, Get data view API>> to retrieve a single data view
     ** <<data-views-api-create, Create data view API>> to create data view
     ** <<data-views-api-update, Update data view API>> to partially updated data view
@@ -27,6 +28,7 @@ The following data views APIs are available:
     ** <<data-views-runtime-field-api-update, Update runtime field API>> to partially update an existing runtime field
     ** <<data-views-runtime-field-api-delete, Delete runtime field API>> to delete a runtime field
 
+include::data-views/get-all.asciidoc[]
 include::data-views/get.asciidoc[]
 include::data-views/create.asciidoc[]
 include::data-views/update.asciidoc[]

docs/api/data-views/get-all.asciidoc

@@ -0,0 +1,59 @@
+[[data-views-api-get-all]]
+=== Get all data views API
+++++
+<titleabbrev>Get all data views</titleabbrev>
+++++
+
+experimental[] Retrieve a list of all data views.
+
+
+[[data-views-api-get-all-request]]
+==== Request
+
+`GET <kibana host>:<port>/api/data_views`
+
+`GET <kibana host>:<port>/s/<space_id>/api/data_views`
+
+
+[[data-views-api-get-all-codes]]
+==== Response code
+
+`200`::
+Indicates a successful call.
+
+
+[[data-views-api-get-all-example]]
+==== Example
+
+Retrieve the list of data views:
+
+[source,sh]
+--------------------------------------------------
+$ curl -X GET api/data_views
+--------------------------------------------------
+// KIBANA
+
+The API returns a list of data views:
+
+[source,sh]
+--------------------------------------------------
+{
+    "data_views": [
+        {
+            "id": "e9e024f0-d098-11ec-bbe9-c753adcb34bc",
+            "namespaces": [
+                "default"
+            ],
+            "title": "tmp*",
+            "typeMeta": {}
+        },
+        {
+            "id": "90943e30-9a47-11e8-b64d-95841ca0b247",
+            "namespaces": [
+                "default"
+            ],
+            "title": "kibana_sample_data_logs"
+        }
+    ]
+}
+--------------------------------------------------

src/plugins/data_views/common/data_views/data_views.ts

@@ -558,7 +558,6 @@ export class DataViewsService {
    * Get an index pattern by id. Cache optimized
    * @param id
    */
-
   get = async (id: string): Promise<DataView> => {
     const indexPatternPromise =
       this.dataViewCache.get(id) || this.dataViewCache.set(id, this.getSavedObjectAndInit(id));

src/plugins/data_views/server/constants.ts

@@ -24,6 +24,7 @@ export const SPECIFIC_SCRIPTED_FIELD_PATH_LEGACY = `${SCRIPTED_FIELD_PATH_LEGACY
 
 export const SERVICE_KEY = 'data_view';
 export const SERVICE_KEY_LEGACY = 'index_pattern';
+export const SERVICE_KEY_MULTIPLE = 'data_views';
 export type SERVICE_KEY_TYPE = typeof SERVICE_KEY | typeof SERVICE_KEY_LEGACY;
 
 export const CREATE_DATA_VIEW_COUNTER_NAME = `POST ${DATA_VIEW_PATH}`;

src/plugins/data_views/server/mocks.ts

@@ -29,4 +29,5 @@ export const dataViewsService = {
   getDefaultId: jest.fn(),
   updateSavedObject: jest.fn(),
   refreshFields: jest.fn(),
+  getIdsWithTitle: jest.fn(),
 } as unknown as jest.Mocked<DataViewsService>;

src/plugins/data_views/server/rest_api_routes/get_data_views.test.ts

@@ -0,0 +1,23 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { getDataViews } from './get_data_views';
+import { dataViewsService } from '../mocks';
+import { getUsageCollection } from './test_utils';
+
+describe('get all data views', () => {
+  it('call usageCollection', () => {
+    const usageCollection = getUsageCollection();
+    getDataViews({
+      dataViewsService,
+      counterName: 'GET /path',
+      usageCollection,
+    });
+    expect(usageCollection.incrementCounter).toBeCalledTimes(1);
+  });
+});

src/plugins/data_views/server/rest_api_routes/get_data_views.ts

@@ -0,0 +1,80 @@
+/*
+ * 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 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import { UsageCounter } from '@kbn/usage-collection-plugin/server';
+import { IRouter, StartServicesAccessor } from '@kbn/core/server';
+import { DataViewsService } from '../../common';
+import { handleErrors } from './util/handle_errors';
+import type { DataViewsServerPluginStartDependencies, DataViewsServerPluginStart } from '../types';
+import { SERVICE_PATH, SERVICE_KEY_MULTIPLE } from '../constants';
+
+interface GetDataViewsArgs {
+  dataViewsService: DataViewsService;
+  usageCollection?: UsageCounter;
+  counterName: string;
+}
+
+export const getDataViews = async ({
+  dataViewsService,
+  usageCollection,
+  counterName,
+}: GetDataViewsArgs) => {
+  usageCollection?.incrementCounter({ counterName });
+  return dataViewsService.getIdsWithTitle();
+};
+
+const getDataViewsRouteFactory =
+  (path: string, serviceKey: string) =>
+  (
+    router: IRouter,
+    getStartServices: StartServicesAccessor<
+      DataViewsServerPluginStartDependencies,
+      DataViewsServerPluginStart
+    >,
+    usageCollection?: UsageCounter
+  ) => {
+    router.get(
+      {
+        path,
+        validate: {},
+      },
+      router.handleLegacyErrors(
+        handleErrors(async (ctx, req, res) => {
+          const core = await ctx.core;
+          const savedObjectsClient = core.savedObjects.client;
+          const elasticsearchClient = core.elasticsearch.client.asCurrentUser;
+          const [, , { dataViewsServiceFactory }] = await getStartServices();
+          const dataViewsService = await dataViewsServiceFactory(
+            savedObjectsClient,
+            elasticsearchClient,
+            req
+          );
+
+          const dataViews = await getDataViews({
+            dataViewsService,
+            usageCollection,
+            counterName: `${req.route.method} ${path}`,
+          });
+
+          return res.ok({
+            headers: {
+              'content-type': 'application/json',
+            },
+            body: {
+              [serviceKey]: dataViews,
+            },
+          });
+        })
+      )
+    );
+  };
+
+export const registerGetDataViewsRoute = getDataViewsRouteFactory(
+  SERVICE_PATH,
+  SERVICE_KEY_MULTIPLE
+);

src/plugins/data_views/server/rest_api_routes/index.ts

@@ -14,6 +14,7 @@ import * as createRoutes from './create_data_view';
 import * as defaultRoutes from './default_data_view';
 import * as deleteRoutes from './delete_data_view';
 import * as getRoutes from './get_data_view';
+import * as getAllRoutes from './get_data_views';
 import * as hasRoutes from './has_user_data_view';
 import * as updateRoutes from './update_data_view';
 
@@ -38,6 +39,7 @@ const routes = [
   deleteRoutes.registerDeleteDataViewRouteLegacy,
   getRoutes.registerGetDataViewRoute,
   getRoutes.registerGetDataViewRouteLegacy,
+  getAllRoutes.registerGetDataViewsRoute,
   hasRoutes.registerHasUserDataViewRoute,
   hasRoutes.registerHasUserDataViewRouteLegacy,
   updateRoutes.registerUpdateDataViewRoute,