[Metrics UI] Register function for Observability homepage (#70529) (#…

…70647)

* [Metrics UI] Register function for Observability homepage

* Updating types; removing relative path from appLink

Co-authored-by: Elastic Machine <[email protected]>

Co-authored-by: Elastic Machine <[email protected]>

x-pack/plugins/infra/public/metrics_overview_fetchers.test.ts

@@ -0,0 +1,91 @@
+/*
+ * 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 { coreMock } from 'src/core/public/mocks';
+import { createMetricsHasData, createMetricsFetchData } from './metrics_overview_fetchers';
+import { CoreStart } from 'kibana/public';
+import { InfraClientStartDeps, InfraClientStartExports } from './types';
+import moment from 'moment';
+import { FAKE_SNAPSHOT_RESPONSE } from './test_utils';
+
+function setup() {
+  const core = coreMock.createStart();
+  const mockedGetStartServices = jest.fn(() => {
+    const deps = {};
+    return Promise.resolve([
+      core as CoreStart,
+      deps as InfraClientStartDeps,
+      void 0 as InfraClientStartExports,
+    ]) as Promise<[CoreStart, InfraClientStartDeps, InfraClientStartExports]>;
+  });
+  return { core, mockedGetStartServices };
+}
+
+describe('Metrics UI Observability Homepage Functions', () => {
+  describe('createMetricsHasData()', () => {
+    it('should return true when true', async () => {
+      const { core, mockedGetStartServices } = setup();
+      core.http.get.mockResolvedValue({
+        status: {
+          indexFields: [],
+          logIndicesExist: false,
+          metricIndicesExist: true,
+        },
+      });
+      const hasData = createMetricsHasData(mockedGetStartServices);
+      const response = await hasData();
+      expect(core.http.get).toHaveBeenCalledTimes(1);
+      expect(response).toBeTruthy();
+    });
+    it('should return false when false', async () => {
+      const { core, mockedGetStartServices } = setup();
+      core.http.get.mockResolvedValue({
+        status: {
+          indexFields: [],
+          logIndicesExist: false,
+          metricIndicesExist: false,
+        },
+      });
+      const hasData = createMetricsHasData(mockedGetStartServices);
+      const response = await hasData();
+      expect(core.http.get).toHaveBeenCalledTimes(1);
+      expect(response).toBeFalsy();
+    });
+  });
+
+  describe('createMetricsFetchData()', () => {
+    it('should just work', async () => {
+      const { core, mockedGetStartServices } = setup();
+      core.http.post.mockResolvedValue(FAKE_SNAPSHOT_RESPONSE);
+      const fetchData = createMetricsFetchData(mockedGetStartServices);
+      const endTime = moment();
+      const startTime = endTime.clone().subtract(1, 'h');
+      const bucketSize = '300s';
+      const response = await fetchData({
+        startTime: startTime.toISOString(),
+        endTime: endTime.toISOString(),
+        bucketSize,
+      });
+      expect(core.http.post).toHaveBeenCalledTimes(1);
+      expect(core.http.post).toHaveBeenCalledWith('/api/metrics/snapshot', {
+        body: JSON.stringify({
+          sourceId: 'default',
+          metrics: [{ type: 'cpu' }, { type: 'memory' }, { type: 'rx' }, { type: 'tx' }],
+          groupBy: [],
+          nodeType: 'host',
+          timerange: {
+            from: startTime.valueOf(),
+            to: endTime.valueOf(),
+            interval: '300s',
+            forceInterval: true,
+            ignoreLookback: true,
+          },
+        }),
+      });
+      expect(response).toMatchSnapshot();
+    });
+  });
+});