Add streaming API updates for announcements being modified or deleted (#12963)

Change `all_day` to be a visual client-side cue only

Publish immediately if `scheduled_at` is in the past

Add `published_at` and `updated_at` to announcements JSON

5 files changed, 69 insertions, 25 deletions

diff --git a/app/javascript/mastodon/actions/announcements.js b/app/javascript/mastodon/actions/announcements.js
index 53b19a6fd..f072a407f 100644
--- a/app/javascript/mastodon/actions/announcements.js
+++ b/app/javascript/mastodon/actions/announcements.js
@@ -5,6 +5,7 @@ export const ANNOUNCEMENTS_FETCH_REQUEST = 'ANNOUNCEMENTS_FETCH_REQUEST';
 export const ANNOUNCEMENTS_FETCH_SUCCESS = 'ANNOUNCEMENTS_FETCH_SUCCESS';
 export const ANNOUNCEMENTS_FETCH_FAIL    = 'ANNOUNCEMENTS_FETCH_FAIL';
 export const ANNOUNCEMENTS_UPDATE        = 'ANNOUNCEMENTS_UPDATE';
+export const ANNOUNCEMENTS_DELETE        = 'ANNOUNCEMENTS_DELETE';
 
 export const ANNOUNCEMENTS_REACTION_ADD_REQUEST = 'ANNOUNCEMENTS_REACTION_ADD_REQUEST';
 export const ANNOUNCEMENTS_REACTION_ADD_SUCCESS = 'ANNOUNCEMENTS_REACTION_ADD_SUCCESS';
@@ -139,8 +140,11 @@ export const updateReaction = reaction => ({
   reaction,
 });
 
-export function toggleShowAnnouncements() {
-  return dispatch => {
-    dispatch({ type: ANNOUNCEMENTS_TOGGLE_SHOW });
-  };
-}
+export const toggleShowAnnouncements = () => ({
+  type: ANNOUNCEMENTS_TOGGLE_SHOW,
+});
+
+export const deleteAnnouncement = id => ({
+  type: ANNOUNCEMENTS_DELETE,
+  id,
+});
diff --git a/app/javascript/mastodon/actions/streaming.js b/app/javascript/mastodon/actions/streaming.js
index ac325f74c..79b08bdda 100644
--- a/app/javascript/mastodon/actions/streaming.js
+++ b/app/javascript/mastodon/actions/streaming.js
@@ -8,7 +8,12 @@ import {
 } from './timelines';
 import { updateNotifications, expandNotifications } from './notifications';
 import { updateConversations } from './conversations';
-import { fetchAnnouncements, updateAnnouncements, updateReaction as updateAnnouncementsReaction } from './announcements';
+import {
+  fetchAnnouncements,
+  updateAnnouncements,
+  updateReaction as updateAnnouncementsReaction,
+  deleteAnnouncement,
+} from './announcements';
 import { fetchFilters } from './filters';
 import { getLocale } from '../locales';
 
@@ -51,6 +56,9 @@ export function connectTimelineStream (timelineId, path, pollingRefresh = null,
         case 'announcement.reaction':
           dispatch(updateAnnouncementsReaction(JSON.parse(data.payload)));
           break;
+        case 'announcement.delete':
+          dispatch(deleteAnnouncement(data.payload));
+          break;
         }
       },
     };
diff --git a/app/javascript/mastodon/components/animated_number.js b/app/javascript/mastodon/components/animated_number.js
index 2d359fbc6..3bfe86aa6 100644
--- a/app/javascript/mastodon/components/animated_number.js
+++ b/app/javascript/mastodon/components/animated_number.js
@@ -27,7 +27,8 @@ export default class AnimatedNumber extends React.PureComponent {
     }
 
     const styles = [{
-      key: value,
+      key: `${value}`,
+      data: value,
       style: { y: spring(0, { damping: 35, stiffness: 400 }) },
     }];
 
@@ -35,8 +36,8 @@ export default class AnimatedNumber extends React.PureComponent {
       <TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}>
         {items => (
           <span className='animated-number'>
-            {items.map(({ key, style }) => (
-              <span key={key} style={{ position: style.y > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}><FormattedNumber value={key} /></span>
+            {items.map(({ key, data, style }) => (
+              <span key={key} style={{ position: style.y > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}><FormattedNumber value={data} /></span>
             ))}
           </span>
         )}
diff --git a/app/javascript/mastodon/features/getting_started/components/announcements.js b/app/javascript/mastodon/features/getting_started/components/announcements.js
index 8ff1b0b4e..acaa552aa 100644
--- a/app/javascript/mastodon/features/getting_started/components/announcements.js
+++ b/app/javascript/mastodon/features/getting_started/components/announcements.js
@@ -367,11 +367,13 @@ class Announcements extends ImmutablePureComponent {
             ))}
           </ReactSwipeableViews>
 
-          <div className='announcements__pagination'>
-            <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.previous)} icon='chevron-left' onClick={this.handlePrevClick} size={13} />
-            <span>{index + 1} / {announcements.size}</span>
-            <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.next)} icon='chevron-right' onClick={this.handleNextClick} size={13} />
-          </div>
+          {announcements.size > 1 && (
+            <div className='announcements__pagination'>
+              <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.previous)} icon='chevron-left' onClick={this.handlePrevClick} size={13} />
+              <span>{index + 1} / {announcements.size}</span>
+              <IconButton disabled={announcements.size === 1} title={intl.formatMessage(messages.next)} icon='chevron-right' onClick={this.handleNextClick} size={13} />
+            </div>
+          )}
         </div>
       </div>
     );
diff --git a/app/javascript/mastodon/reducers/announcements.js b/app/javascript/mastodon/reducers/announcements.js
index 1cfb598fb..3215c1c2d 100644
--- a/app/javascript/mastodon/reducers/announcements.js
+++ b/app/javascript/mastodon/reducers/announcements.js
@@ -9,6 +9,7 @@ import {
   ANNOUNCEMENTS_REACTION_REMOVE_REQUEST,
   ANNOUNCEMENTS_REACTION_REMOVE_FAIL,
   ANNOUNCEMENTS_TOGGLE_SHOW,
+  ANNOUNCEMENTS_DELETE,
 } from '../actions/announcements';
 import { Map as ImmutableMap, List as ImmutableList, Set as ImmutableSet, fromJS } from 'immutable';
 
@@ -22,14 +23,10 @@ const initialState = ImmutableMap({
 const updateReaction = (state, id, name, updater) => state.update('items', list => list.map(announcement => {
   if (announcement.get('id') === id) {
     return announcement.update('reactions', reactions => {
-      if (reactions.find(reaction => reaction.get('name') === name)) {
-        return reactions.map(reaction => {
-          if (reaction.get('name') === name) {
-            return updater(reaction);
-          }
-
-          return reaction;
-        });
+      const idx = reactions.findIndex(reaction => reaction.get('name') === name);
+
+      if (idx > -1) {
+        return reactions.update(idx, reaction => updater(reaction));
       }
 
       return reactions.push(updater(fromJS({ name, count: 0 })));
@@ -46,13 +43,33 @@ const addReaction = (state, id, name) => updateReaction(state, id, name, x => x.
 const removeReaction = (state, id, name) => updateReaction(state, id, name, x => x.set('me', false).update('count', y => y - 1));
 
 const addUnread = (state, items) => {
-  if (state.get('show')) return state;
+  if (state.get('show')) {
+    return state;
+  }
 
   const newIds = ImmutableSet(items.map(x => x.get('id')));
   const oldIds = ImmutableSet(state.get('items').map(x => x.get('id')));
+
   return state.update('unread', unread => unread.union(newIds.subtract(oldIds)));
 };
 
+const sortAnnouncements = list => list.sortBy(x => x.get('starts_at') || x.get('published_at'));
+
+const updateAnnouncement = (state, announcement) => {
+  const idx = state.get('items').findIndex(x => x.get('id') === announcement.get('id'));
+
+  state = addUnread(state, [announcement]);
+
+  if (idx > -1) {
+    // Deep merge is used because announcements from the streaming API do not contain
+    // personalized data about which reactions have been selected by the given user,
+    // and that is information we want to preserve
+    return state.update('items', list => sortAnnouncements(list.update(idx, x => x.mergeDeep(announcement))));
+  }
+
+  return state.update('items', list => sortAnnouncements(list.unshift(announcement)));
+};
+
 export default function announcementsReducer(state = initialState, action) {
   switch(action.type) {
   case ANNOUNCEMENTS_TOGGLE_SHOW:
@@ -65,15 +82,17 @@ export default function announcementsReducer(state = initialState, action) {
   case ANNOUNCEMENTS_FETCH_SUCCESS:
     return state.withMutations(map => {
       const items = fromJS(action.announcements);
+
       map.set('unread', ImmutableSet());
-      addUnread(map, items);
       map.set('items', items);
       map.set('isLoading', false);
+
+      addUnread(map, items);
     });
   case ANNOUNCEMENTS_FETCH_FAIL:
     return state.set('isLoading', false);
   case ANNOUNCEMENTS_UPDATE:
-    return addUnread(state, [fromJS(action.announcement)]).update('items', list => list.unshift(fromJS(action.announcement)).sortBy(announcement => announcement.get('starts_at')));
+    return updateAnnouncement(state, fromJS(action.announcement));
   case ANNOUNCEMENTS_REACTION_UPDATE:
     return updateReactionCount(state, action.reaction);
   case ANNOUNCEMENTS_REACTION_ADD_REQUEST:
@@ -82,6 +101,16 @@ export default function announcementsReducer(state = initialState, action) {
   case ANNOUNCEMENTS_REACTION_REMOVE_REQUEST:
   case ANNOUNCEMENTS_REACTION_ADD_FAIL:
     return removeReaction(state, action.id, action.name);
+  case ANNOUNCEMENTS_DELETE:
+    return state.update('unread', set => set.delete(action.id)).update('items', list => {
+      const idx = list.findIndex(x => x.get('id') === action.id);
+
+      if (idx > -1) {
+        return list.delete(idx);
+      }
+
+      return list;
+    });
   default:
     return state;
   }