Workspace list pr (opensearch-project#285)

* feat: add workspace list

Signed-off-by: tygao <tygao@amazon.com>

* update index.ts

Signed-off-by: tygao <tygao@amazon.com>

* test: update workspace plugin test

Signed-off-by: tygao <tygao@amazon.com>

* remove extra file and add test for modal

Signed-off-by: tygao <tygao@amazon.com>

* test: add tests for workspace util

Signed-off-by: tygao <tygao@amazon.com>

* test: update test for delete_workspace_modal

Signed-off-by: tygao <tygao@amazon.com>

* test: update test for delete_workspace_modal

Signed-off-by: tygao <tygao@amazon.com>

* test: update test for workspace list

Signed-off-by: tygao <tygao@amazon.com>

* rename and update test

Signed-off-by: tygao <tygao@amazon.com>

* add tests for workspace list

Signed-off-by: tygao <tygao@amazon.com>

---------

Signed-off-by: tygao <tygao@amazon.com>

src/core/public/index.ts

@@ -357,3 +357,5 @@ export { __osdBootstrap__ } from './osd_bootstrap';
 export { WorkspacesStart, WorkspacesSetup, WorkspacesService } from './workspace';
 
 export { WORKSPACE_TYPE, cleanWorkspaceId, DEFAULT_WORKSPACE_ID } from '../utils';
+
+export { debounce } from './utils';

src/core/public/utils/debounce.test.ts

@@ -0,0 +1,55 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import { debounce } from './debounce';
+
+describe('debounce', () => {
+  let fn: Function;
+  beforeEach(() => {
+    fn = jest.fn();
+    jest.useFakeTimers();
+  });
+  afterEach(() => {
+    jest.clearAllTimers();
+  });
+
+  test('it should call the debounced fn once at the end of the quiet time', () => {
+    const debounced = debounce(fn, 1000);
+
+    for (let i = 0; i < 100; i++) {
+      debounced(i);
+    }
+
+    jest.advanceTimersByTime(1001);
+    expect(fn).toBeCalledTimes(1);
+    expect(fn).toBeCalledWith(99);
+  });
+
+  test("with a leading invocation, it should call the debounced fn once, if the time doens't pass", () => {
+    const debounced = debounce(fn, 1000, true);
+
+    for (let i = 0; i < 100; i++) {
+      debounced(i);
+    }
+
+    jest.advanceTimersByTime(999);
+
+    expect(fn).toBeCalledTimes(1);
+    expect(fn).toBeCalledWith(0);
+  });
+
+  test('with a leading invocation, it should call the debounced fn twice (at the beginning and at the end)', () => {
+    const debounced = debounce(fn, 1000, true);
+
+    for (let i = 0; i < 100; i++) {
+      debounced(i);
+    }
+
+    jest.advanceTimersByTime(1500);
+
+    expect(fn).toBeCalledTimes(2);
+    expect(fn).toBeCalledWith(0);
+    expect(fn).toBeCalledWith(99);
+  });
+});

src/core/public/utils/debounce.ts

@@ -0,0 +1,23 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @param func The function to be debounced.
+ * @param delay The time in milliseconds to wait before invoking the function again after the last invocation.
+ * @param leading An optional parameter that, when true, allows the function to be invoked immediately upon the first call. 
+
+ */
+export const debounce = (func: Function, delay: number, leading?: boolean) => {
+  let timerId: NodeJS.Timeout;
+
+  return (...args: any) => {
+    if (!timerId && leading) {
+      func(...args);
+    }
+    clearTimeout(timerId);
+
+    timerId = setTimeout(() => func(...args), delay);
+  };
+};

src/core/public/utils/index.ts

@@ -38,3 +38,4 @@ export {
   getWorkspaceIdFromUrl,
   cleanWorkspaceId,
 } from '../../utils';
+export { debounce } from './debounce';

src/plugins/workspace/public/application.tsx

@@ -7,6 +7,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 import { AppMountParameters, ScopedHistory } from '../../../core/public';
 import { OpenSearchDashboardsContextProvider } from '../../opensearch_dashboards_react/public';
+import { WorkspaceListApp } from './components/workspace_list_app';
 import { WorkspaceFatalError } from './components/workspace_fatal_error';
 import { Services } from './types';
 
@@ -24,3 +25,16 @@ export const renderFatalErrorApp = (params: AppMountParameters, services: Servic
     ReactDOM.unmountComponentAtNode(element);
   };
 };
+
+export const renderListApp = ({ element }: AppMountParameters, services: Services) => {
+  ReactDOM.render(
+    <OpenSearchDashboardsContextProvider services={services}>
+      <WorkspaceListApp />
+    </OpenSearchDashboardsContextProvider>,
+    element
+  );
+
+  return () => {
+    ReactDOM.unmountComponentAtNode(element);
+  };
+};