Fix too many requests caused by relationship look-ups in web UI (#32042)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/mastodon/actions/accounts.js

@@ -1,4 +1,5 @@
 import { browserHistory } from 'mastodon/components/router';
+import { debounceWithDispatchAndArguments } from 'mastodon/utils/debounce';
 
 import api, { getLinks } from '../api';
 
@@ -449,6 +450,20 @@ export function expandFollowingFail(id, error) {
   };
 }
 
+const debouncedFetchRelationships = debounceWithDispatchAndArguments((dispatch, ...newAccountIds) => {
+  if (newAccountIds.length === 0) {
+    return;
+  }
+
+  dispatch(fetchRelationshipsRequest(newAccountIds));
+
+  api().get(`/api/v1/accounts/relationships?with_suspended=true&${newAccountIds.map(id => `id[]=${id}`).join('&')}`).then(response => {
+    dispatch(fetchRelationshipsSuccess({ relationships: response.data }));
+  }).catch(error => {
+    dispatch(fetchRelationshipsFail(error));
+  });
+}, { delay: 500 });
+
 export function fetchRelationships(accountIds) {
   return (dispatch, getState) => {
     const state = getState();
@@ -460,13 +475,7 @@ export function fetchRelationships(accountIds) {
       return;
     }
 
-    dispatch(fetchRelationshipsRequest(newAccountIds));
-
-    api().get(`/api/v1/accounts/relationships?with_suspended=true&${newAccountIds.map(id => `id[]=${id}`).join('&')}`).then(response => {
-      dispatch(fetchRelationshipsSuccess({ relationships: response.data }));
-    }).catch(error => {
-      dispatch(fetchRelationshipsFail(error));
-    });
+    debouncedFetchRelationships(dispatch, ...newAccountIds);
   };
 }
 

app/javascript/mastodon/actions/notifications.js

@@ -10,7 +10,7 @@ import api, { getLinks } from '../api';
 import { unescapeHTML } from '../utils/html';
 import { requestNotificationPermission } from '../utils/notifications';
 
-import { fetchFollowRequests, fetchRelationships } from './accounts';
+import { fetchFollowRequests } from './accounts';
 import {
   importFetchedAccount,
   importFetchedAccounts,
@@ -56,14 +56,6 @@ defineMessages({
   group: { id: 'notifications.group', defaultMessage: '{count} notifications' },
 });
 
-const fetchRelatedRelationships = (dispatch, notifications) => {
-  const accountIds = notifications.filter(item => ['follow', 'follow_request', 'admin.sign_up'].indexOf(item.type) !== -1).map(item => item.account.id);
-
-  if (accountIds.length > 0) {
-    dispatch(fetchRelationships(accountIds));
-  }
-};
-
 export const loadPending = () => ({
   type: NOTIFICATIONS_LOAD_PENDING,
 });
@@ -106,8 +98,6 @@ export function updateNotifications(notification, intlMessages, intlLocale) {
 
 
       dispatch(notificationsUpdate({ notification, preferPendingItems, playSound: playSound && !filtered}));
-
-      fetchRelatedRelationships(dispatch, [notification]);
     } else if (playSound && !filtered) {
       dispatch({
         type: NOTIFICATIONS_UPDATE_NOOP,
@@ -199,7 +189,6 @@ export function expandNotifications({ maxId = undefined, forceLoad = false }) {
       dispatch(importFetchedAccounts(response.data.filter(item => item.report).map(item => item.report.target_account)));
 
       dispatch(expandNotificationsSuccess(response.data, next ? next.uri : null, isLoadingMore, isLoadingRecent, isLoadingRecent && preferPendingItems));
-      fetchRelatedRelationships(dispatch, response.data);
       dispatch(submitMarkers());
     } catch(error) {
       dispatch(expandNotificationsFail(error, isLoadingMore));

app/javascript/mastodon/utils/debounce.ts

@@ -0,0 +1,23 @@
+import { debounce } from 'lodash';
+
+import type { AppDispatch } from 'mastodon/store';
+
+export const debounceWithDispatchAndArguments = <T>(
+  fn: (dispatch: AppDispatch, ...args: T[]) => void,
+  { delay = 100 },
+) => {
+  let argumentBuffer: T[] = [];
+  let dispatchBuffer: AppDispatch;
+
+  const wrapped = debounce(() => {
+    const tmpBuffer = argumentBuffer;
+    argumentBuffer = [];
+    fn(dispatchBuffer, ...tmpBuffer);
+  }, delay);
+
+  return (dispatch: AppDispatch, ...args: T[]) => {
+    dispatchBuffer = dispatch;
+    argumentBuffer.push(...args);
+    wrapped();
+  };
+};