[ML] New Platform server shim: update fields service routes (#58060) (#58222)

* update fieldsService routes to use NP router

* fix file name typo

* add routes names for docs

Author: alvarezmelissa87

x-pack/legacy/plugins/ml/server/models/fields_service/fields_service.d.ts

@@ -0,0 +1,21 @@
+/*
+ * 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 { APICaller } from 'src/core/server';
+
+export function fieldsServiceProvider(
+  callAsCurrentUser: APICaller
+): {
+  getCardinalityOfFields: (
+    index: string[] | string,
+    fieldNames: string[],
+    query: any,
+    timeFieldName: string,
+    earliestMs: number,
+    latestMs: number
+  ) => Promise<any>;
+  getTimeFieldRange: (index: string[] | string, timeFieldName: string, query: any) => Promise<any>;
+};

x-pack/legacy/plugins/ml/server/models/fields_service/fields_service.js

@@ -7,7 +7,7 @@
 // Service for carrying out queries to obtain data
 // specific to fields in Elasticsearch indices.
 
-export function fieldsServiceProvider(callWithRequest) {
+export function fieldsServiceProvider(callAsCurrentUser) {
   // Obtains the cardinality of one or more fields.
   // Returns an Object whose keys are the names of the fields,
   // with values equal to the cardinality of the field.
@@ -17,7 +17,7 @@ export function fieldsServiceProvider(callWithRequest) {
     // First check that each of the supplied fieldNames are aggregatable,
     // then obtain the cardinality for each of the aggregatable fields.
     return new Promise((resolve, reject) => {
-      callWithRequest('fieldCaps', {
+      callAsCurrentUser('fieldCaps', {
         index,
         fields: fieldNames,
       })
@@ -72,7 +72,7 @@ export function fieldsServiceProvider(callWithRequest) {
               aggs,
             };
 
-            callWithRequest('search', {
+            callAsCurrentUser('search', {
               index,
               body,
             })
@@ -106,7 +106,7 @@ export function fieldsServiceProvider(callWithRequest) {
     return new Promise((resolve, reject) => {
       const obj = { success: true, start: { epoch: 0, string: '' }, end: { epoch: 0, string: '' } };
 
-      callWithRequest('search', {
+      callAsCurrentUser('search', {
         index,
         size: 0,
         body: {

x-pack/legacy/plugins/ml/server/models/fields_service/index.js renamed to x-pack/legacy/plugins/ml/server/models/fields_service/index.ts

@@ -0,0 +1,22 @@
+/*
+ * 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 { schema } from '@kbn/config-schema';
+
+export const getCardinalityOfFieldsSchema = schema.object({
+  index: schema.oneOf([schema.string(), schema.arrayOf(schema.string())]),
+  fieldNames: schema.maybe(schema.arrayOf(schema.string())),
+  query: schema.maybe(schema.any()),
+  timeFieldName: schema.maybe(schema.string()),
+  earliestMs: schema.maybe(schema.oneOf([schema.number(), schema.string()])),
+  latestMs: schema.maybe(schema.oneOf([schema.number(), schema.string()])),
+});
+
+export const getTimeFieldRangeSchema = schema.object({
+  index: schema.oneOf([schema.string(), schema.arrayOf(schema.string())]),
+  timeFieldName: schema.maybe(schema.string()),
+  query: schema.maybe(schema.any()),
+});

x-pack/legacy/plugins/ml/server/new_platform/fields_service_schema.ts

@@ -105,6 +105,9 @@
     "DeleteDatafeed",
     "StartDatafeed",
     "StopDatafeed",
-    "PreviewDatafeed"
+    "PreviewDatafeed",
+    "FieldsService",
+    "GetCardinalityOfFields",
+    "GetTimeFieldRange"
   ]
 }

x-pack/legacy/plugins/ml/server/routes/apidoc.json

@@ -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;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { RequestHandlerContext } from 'src/core/server';
+import { licensePreRoutingFactory } from '../new_platform/licence_check_pre_routing_factory';
+import { wrapError } from '../client/error_wrapper';
+import { RouteInitialization } from '../new_platform/plugin';
+import {
+  getCardinalityOfFieldsSchema,
+  getTimeFieldRangeSchema,
+} from '../new_platform/fields_service_schema';
+import { fieldsServiceProvider } from '../models/fields_service';
+
+function getCardinalityOfFields(context: RequestHandlerContext, payload: any) {
+  const fs = fieldsServiceProvider(context.ml!.mlClient.callAsCurrentUser);
+  const { index, fieldNames, query, timeFieldName, earliestMs, latestMs } = payload;
+  return fs.getCardinalityOfFields(index, fieldNames, query, timeFieldName, earliestMs, latestMs);
+}
+
+function getTimeFieldRange(context: RequestHandlerContext, payload: any) {
+  const fs = fieldsServiceProvider(context.ml!.mlClient.callAsCurrentUser);
+  const { index, timeFieldName, query } = payload;
+  return fs.getTimeFieldRange(index, timeFieldName, query);
+}
+
+/**
+ * Routes for fields service
+ */
+export function fieldsService({ xpackMainPlugin, router }: RouteInitialization) {
+  /**
+   * @apiGroup FieldsService
+   *
+   * @api {post} /api/ml/fields_service/field_cardinality Get cardinality of fields
+   * @apiName GetCardinalityOfFields
+   * @apiDescription Returns the cardinality of one or more fields. Returns an Object whose keys are the names of the fields, with values equal to the cardinality of the field
+   */
+  router.post(
+    {
+      path: '/api/ml/fields_service/field_cardinality',
+      validate: {
+        body: getCardinalityOfFieldsSchema,
+      },
+    },
+    licensePreRoutingFactory(xpackMainPlugin, async (context, request, response) => {
+      try {
+        const resp = await getCardinalityOfFields(context, request.body);
+
+        return response.ok({
+          body: resp,
+        });
+      } catch (e) {
+        return response.customError(wrapError(e));
+      }
+    })
+  );
+
+  /**
+   * @apiGroup FieldsService
+   *
+   * @api {post} /api/ml/fields_service/time_field_range Get time field range
+   * @apiName GetTimeFieldRange
+   * @apiDescription Returns the timefield range for the given index
+   */
+  router.post(
+    {
+      path: '/api/ml/fields_service/time_field_range',
+      validate: {
+        body: getTimeFieldRangeSchema,
+      },
+    },
+    licensePreRoutingFactory(xpackMainPlugin, async (context, request, response) => {
+      try {
+        const resp = await getTimeFieldRange(context, request.body);
+
+        return response.ok({
+          body: resp,
+        });
+      } catch (e) {
+        return response.customError(wrapError(e));
+      }
+    })
+  );
+}