[State Management] State syncing helpers for query service I (elastic…

…#56128)

Before this pr:

Discover, Visualise and Dashboard in setup phase create own state containers which watch for pinned filters, time and refresh interval changes. This watching and state comparisons happen for each plugin separately and not only when a specific app is mounted. So we ended up with a bunch of similar synchronous work which happens every time query services state changes.

After this pr:

Query service exposes observable to watch for changes (state$). Discover, Visualise and Dashboard use this observable for sub url tracking instead of creating its own.

examples/state_containers_examples/common/index.ts

@@ -0,0 +1,21 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+export const PLUGIN_ID = 'stateContainersExampleWithDataServices';
+export const PLUGIN_NAME = 'State containers example - with data services';

examples/state_containers_examples/kibana.json

@@ -3,8 +3,8 @@
   "version": "0.0.1",
   "kibanaVersion": "kibana",
   "configPath": ["state_containers_examples"],
-  "server": false,
+  "server": true,
   "ui": true,
-  "requiredPlugins": [],
+  "requiredPlugins": ["navigation", "data"],
   "optionalPlugins": []
 }

examples/state_containers_examples/public/plugin.ts

@@ -18,14 +18,16 @@
  */
 
 import { AppMountParameters, CoreSetup, Plugin } from 'kibana/public';
+import { AppPluginDependencies } from './with_data_services/types';
+import { PLUGIN_ID, PLUGIN_NAME } from '../common';
 
 export class StateContainersExamplesPlugin implements Plugin {
   public setup(core: CoreSetup) {
     core.application.register({
-      id: 'state-containers-example-browser-history',
+      id: 'stateContainersExampleBrowserHistory',
       title: 'State containers example - browser history routing',
       async mount(params: AppMountParameters) {
-        const { renderApp, History } = await import('./app');
+        const { renderApp, History } = await import('./todo/app');
         return renderApp(params, {
           appInstanceId: '1',
           appTitle: 'Routing with browser history',
@@ -34,17 +36,30 @@ export class StateContainersExamplesPlugin implements Plugin {
       },
     });
     core.application.register({
-      id: 'state-containers-example-hash-history',
+      id: 'stateContainersExampleHashHistory',
       title: 'State containers example - hash history routing',
       async mount(params: AppMountParameters) {
-        const { renderApp, History } = await import('./app');
+        const { renderApp, History } = await import('./todo/app');
         return renderApp(params, {
           appInstanceId: '2',
           appTitle: 'Routing with hash history',
           historyType: History.Hash,
         });
       },
     });
+
+    core.application.register({
+      id: PLUGIN_ID,
+      title: PLUGIN_NAME,
+      async mount(params: AppMountParameters) {
+        // Load application bundle
+        const { renderApp } = await import('./with_data_services/application');
+        // Get start services as specified in kibana.json
+        const [coreStart, depsStart] = await core.getStartServices();
+        // Render the application
+        return renderApp(coreStart, depsStart as AppPluginDependencies, params);
+      },
+    });
   }
 
   public start() {}

examples/state_containers_examples/public/todo.tsx → examples/state_containers_examples/public/todo/todo.tsx

@@ -42,14 +42,14 @@ import {
   syncStates,
   getStateFromKbnUrl,
   BaseState,
-} from '../../../src/plugins/kibana_utils/public';
-import { useUrlTracker } from '../../../src/plugins/kibana_react/public';
+} from '../../../../src/plugins/kibana_utils/public';
+import { useUrlTracker } from '../../../../src/plugins/kibana_react/public';
 import {
   defaultState,
   pureTransitions,
   TodoActions,
   TodoState,
-} from '../../../src/plugins/kibana_utils/demos/state_containers/todomvc';
+} from '../../../../src/plugins/kibana_utils/demos/state_containers/todomvc';
 
 interface GlobalState {
   text: string;

examples/state_containers_examples/public/with_data_services/application.tsx

@@ -0,0 +1,49 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { createBrowserHistory } from 'history';
+import { AppMountParameters, CoreStart } from '../../../../src/core/public';
+import { AppPluginDependencies } from './types';
+import { StateDemoApp } from './components/app';
+import { createKbnUrlStateStorage } from '../../../../src/plugins/kibana_utils/public/';
+
+export const renderApp = (
+  { notifications, http }: CoreStart,
+  { navigation, data }: AppPluginDependencies,
+  { appBasePath, element }: AppMountParameters
+) => {
+  const history = createBrowserHistory({ basename: appBasePath });
+  const kbnUrlStateStorage = createKbnUrlStateStorage({ useHash: false, history });
+
+  ReactDOM.render(
+    <StateDemoApp
+      notifications={notifications}
+      http={http}
+      navigation={navigation}
+      data={data}
+      history={history}
+      kbnUrlStateStorage={kbnUrlStateStorage}
+    />,
+    element
+  );
+
+  return () => ReactDOM.unmountComponentAtNode(element);
+};

examples/state_containers_examples/public/with_data_services/components/app.tsx

@@ -0,0 +1,243 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import React, { useEffect, useRef, useState, useCallback } from 'react';
+import { History } from 'history';
+import { FormattedMessage, I18nProvider } from '@kbn/i18n/react';
+import { Router } from 'react-router-dom';
+
+import {
+  EuiFieldText,
+  EuiPage,
+  EuiPageBody,
+  EuiPageContent,
+  EuiPageHeader,
+  EuiTitle,
+} from '@elastic/eui';
+
+import { CoreStart } from '../../../../../src/core/public';
+import { NavigationPublicPluginStart } from '../../../../../src/plugins/navigation/public';
+import {
+  connectToQueryState,
+  syncQueryStateWithUrl,
+  DataPublicPluginStart,
+  IIndexPattern,
+  QueryState,
+  Filter,
+  esFilters,
+  Query,
+} from '../../../../../src/plugins/data/public';
+import {
+  BaseState,
+  BaseStateContainer,
+  createStateContainer,
+  createStateContainerReactHelpers,
+  IKbnUrlStateStorage,
+  ReduxLikeStateContainer,
+  syncState,
+} from '../../../../../src/plugins/kibana_utils/public';
+import { PLUGIN_ID, PLUGIN_NAME } from '../../../common';
+
+interface StateDemoAppDeps {
+  notifications: CoreStart['notifications'];
+  http: CoreStart['http'];
+  navigation: NavigationPublicPluginStart;
+  data: DataPublicPluginStart;
+  history: History;
+  kbnUrlStateStorage: IKbnUrlStateStorage;
+}
+
+interface AppState {
+  name: string;
+  filters: Filter[];
+  query?: Query;
+}
+const defaultAppState: AppState = {
+  name: '',
+  filters: [],
+};
+const {
+  Provider: AppStateContainerProvider,
+  useState: useAppState,
+  useContainer: useAppStateContainer,
+} = createStateContainerReactHelpers<ReduxLikeStateContainer<AppState>>();
+
+const App = ({
+  notifications,
+  http,
+  navigation,
+  data,
+  history,
+  kbnUrlStateStorage,
+}: StateDemoAppDeps) => {
+  const appStateContainer = useAppStateContainer();
+  const appState = useAppState();
+
+  useGlobalStateSyncing(data.query, kbnUrlStateStorage);
+  useAppStateSyncing(appStateContainer, data.query, kbnUrlStateStorage);
+
+  const onQuerySubmit = useCallback(
+    ({ query }) => {
+      appStateContainer.set({ ...appState, query });
+    },
+    [appStateContainer, appState]
+  );
+
+  const indexPattern = useIndexPattern(data);
+  if (!indexPattern)
+    return <div>No index pattern found. Please create an intex patter before loading...</div>;
+
+  // Render the application DOM.
+  // Note that `navigation.ui.TopNavMenu` is a stateful component exported on the `navigation` plugin's start contract.
+  return (
+    <Router history={history}>
+      <I18nProvider>
+        <>
+          <navigation.ui.TopNavMenu
+            appName={PLUGIN_ID}
+            showSearchBar={true}
+            indexPatterns={[indexPattern]}
+            useDefaultBehaviors={true}
+            onQuerySubmit={onQuerySubmit}
+            query={appState.query}
+            showSaveQuery={true}
+          />
+          <EuiPage restrictWidth="1000px">
+            <EuiPageBody>
+              <EuiPageHeader>
+                <EuiTitle size="l">
+                  <h1>
+                    <FormattedMessage
+                      id="stateDemo.helloWorldText"
+                      defaultMessage="{name}!"
+                      values={{ name: PLUGIN_NAME }}
+                    />
+                  </h1>
+                </EuiTitle>
+              </EuiPageHeader>
+              <EuiPageContent>
+                <EuiFieldText
+                  placeholder="Additional application state: My name is..."
+                  value={appState.name}
+                  onChange={e => appStateContainer.set({ ...appState, name: e.target.value })}
+                  aria-label="My name"
+                />
+              </EuiPageContent>
+            </EuiPageBody>
+          </EuiPage>
+        </>
+      </I18nProvider>
+    </Router>
+  );
+};
+
+export const StateDemoApp = (props: StateDemoAppDeps) => {
+  const appStateContainer = useCreateStateContainer(defaultAppState);
+
+  return (
+    <AppStateContainerProvider value={appStateContainer}>
+      <App {...props} />
+    </AppStateContainerProvider>
+  );
+};
+
+function useCreateStateContainer<State extends BaseState>(
+  defaultState: State
+): ReduxLikeStateContainer<State> {
+  const stateContainerRef = useRef<ReduxLikeStateContainer<State> | null>(null);
+  if (!stateContainerRef.current) {
+    stateContainerRef.current = createStateContainer(defaultState);
+  }
+  return stateContainerRef.current;
+}
+
+function useIndexPattern(data: DataPublicPluginStart) {
+  const [indexPattern, setIndexPattern] = useState<IIndexPattern>();
+  useEffect(() => {
+    const fetchIndexPattern = async () => {
+      const defaultIndexPattern = await data.indexPatterns.getDefault();
+      if (defaultIndexPattern) {
+        setIndexPattern(defaultIndexPattern);
+      }
+    };
+    fetchIndexPattern();
+  }, [data.indexPatterns]);
+
+  return indexPattern;
+}
+
+function useGlobalStateSyncing(
+  query: DataPublicPluginStart['query'],
+  kbnUrlStateStorage: IKbnUrlStateStorage
+) {
+  // setup sync state utils
+  useEffect(() => {
+    // sync global filters, time filters, refresh interval from data.query to url '_g'
+    const { stop } = syncQueryStateWithUrl(query, kbnUrlStateStorage);
+    return () => {
+      stop();
+    };
+  }, [query, kbnUrlStateStorage]);
+}
+
+function useAppStateSyncing<AppState extends QueryState>(
+  appStateContainer: BaseStateContainer<AppState>,
+  query: DataPublicPluginStart['query'],
+  kbnUrlStateStorage: IKbnUrlStateStorage
+) {
+  // setup sync state utils
+  useEffect(() => {
+    // sync app filters with app state container from data.query to state container
+    const stopSyncingQueryAppStateWithStateContainer = connectToQueryState(
+      query,
+      appStateContainer,
+      { filters: esFilters.FilterStateStore.APP_STATE }
+    );
+
+    // sets up syncing app state container with url
+    const { start: startSyncingAppStateWithUrl, stop: stopSyncingAppStateWithUrl } = syncState({
+      storageKey: '_a',
+      stateStorage: kbnUrlStateStorage,
+      stateContainer: {
+        ...appStateContainer,
+        // stateSync utils requires explicit handling of default state ("null")
+        set: state => state && appStateContainer.set(state),
+      },
+    });
+
+    // merge initial state from app state container and current state in url
+    const initialAppState: AppState = {
+      ...appStateContainer.get(),
+      ...kbnUrlStateStorage.get<AppState>('_a'),
+    };
+    // trigger state update. actually needed in case some data was in url
+    appStateContainer.set(initialAppState);
+
+    // set current url to whatever is in app state container
+    kbnUrlStateStorage.set<AppState>('_a', initialAppState);
+
+    // finally start syncing state containers with url
+    startSyncingAppStateWithUrl();
+
+    return () => {
+      stopSyncingQueryAppStateWithStateContainer();
+      stopSyncingAppStateWithUrl();
+    };
+  }, [query, kbnUrlStateStorage, appStateContainer]);
+}