fix: poll for updates to timeago displays (#1232)

* fix: poll for updates to timeago displays

* code cleanup

* avoid some recomputes

* avoid costly recomputes

src/routes/_components/status/Status.html

@@ -13,11 +13,11 @@
   <StatusAuthorName {...params} />
   <StatusAuthorHandle {...params} />
   {#if !isStatusInOwnThread}
-    <StatusRelativeDate {...params} />
+    <StatusRelativeDate {...params} {...timestampParams} />
   {/if}
   <StatusSidebar {...params} />
   {#if spoilerText}
-    <StatusSpoiler {...params} on:recalculateHeight />
+    <StatusSpoiler {...params} {spoilerShown} on:recalculateHeight />
   {/if}
   {#if !showContent}
     <StatusMentions {...params} />
@@ -35,9 +35,9 @@
     <StatusPoll {...params} />
   {/if}
   {#if isStatusInOwnThread}
-    <StatusDetails {...params} />
+    <StatusDetails {...params} {...timestampParams} />
   {/if}
-  <StatusToolbar {...params} on:recalculateHeight />
+  <StatusToolbar {...params} {replyShown} on:recalculateHeight />
   {#if replyShown}
     <StatusComposeBox {...params} on:recalculateHeight />
   {/if}
@@ -277,13 +277,15 @@
         originalStatus.media_attachments.length
       ),
       originalAccountEmojis: ({ originalAccount }) => (originalAccount.emojis || []),
+      originalStatusEmojis: ({ originalStatus }) => (originalStatus.emojis || []),
       originalAccountDisplayName: ({ originalAccount }) => (originalAccount.display_name || originalAccount.username),
       originalAccountAccessibleName: ({ originalAccount, $omitEmojiInDisplayNames }) => {
         return getAccountAccessibleName(originalAccount, $omitEmojiInDisplayNames)
       },
       createdAtDate: ({ originalStatus }) => originalStatus.created_at,
-      absoluteFormattedDate: ({ createdAtDate }) => absoluteDateFormatter.format(new Date(createdAtDate)),
-      timeagoFormattedDate: ({ createdAtDate }) => formatTimeagoDate(createdAtDate),
+      createdAtDateTS: ({ createdAtDate }) => new Date(createdAtDate).getTime(),
+      absoluteFormattedDate: ({ createdAtDateTS }) => absoluteDateFormatter.format(createdAtDateTS),
+      timeagoFormattedDate: ({ createdAtDateTS, $now }) => formatTimeagoDate(createdAtDateTS, $now),
       reblog: ({ status }) => status.reblog,
       ariaLabel: ({ originalAccount, account, plainTextContent, timeagoFormattedDate, spoilerText,
         showContent, reblog, notification, visibility, $omitEmojiInDisplayNames, $disableLongAriaLabels }) => (
@@ -307,11 +309,22 @@
       )),
       content: ({ originalStatus }) => originalStatus.content || '',
       showContent: ({ spoilerText, spoilerShown }) => !spoilerText || spoilerShown,
+      // These timestamp params may change every 10 seconds due to now() polling, so keep them
+      // separate from the generic `params` list to avoid costly recomputes.
+      timestampParams: ({ createdAtDate, createdAtDateTS, timeagoFormattedDate, absoluteFormattedDate }) => ({
+        createdAtDate,
+        createdAtDateTS,
+        timeagoFormattedDate,
+        absoluteFormattedDate
+      }),
+      // This params list deliberately does *not* include `spoilersShown` or `replyShown`, because these
+      // change frequently and would therefore cause costly recomputes if included here.
+      // The main goal here is to avoid typing by passing as many params as possible to child components.
       params: ({ notification, notificationId, status, statusId, timelineType,
         account, accountId, uuid, isStatusInNotification, isStatusInOwnThread,
-        originalAccount, originalAccountId, spoilerShown, visibility, replyShown,
+        originalAccount, originalAccountId, visibility,
         replyVisibility, spoilerText, originalStatus, originalStatusId, inReplyToId,
-        createdAtDate, timeagoFormattedDate, enableShortcuts, absoluteFormattedDate, shortcutScope }) => ({
+        enableShortcuts, shortcutScope, originalStatusEmojis }) => ({
         notification,
         notificationId,
         status,
@@ -324,19 +337,15 @@
         isStatusInOwnThread,
         originalAccount,
         originalAccountId,
-        spoilerShown,
         visibility,
-        replyShown,
         replyVisibility,
         spoilerText,
         originalStatus,
         originalStatusId,
         inReplyToId,
-        createdAtDate,
-        timeagoFormattedDate,
         enableShortcuts,
-        absoluteFormattedDate,
-        shortcutScope
+        shortcutScope,
+        originalStatusEmojis
       })
     },
     events: {

src/routes/_components/status/StatusContent.html

@@ -76,8 +76,9 @@
         )
       },
       content: ({ originalStatus }) => (originalStatus.content || ''),
-      emojis: ({ originalStatus }) => originalStatus.emojis,
-      massagedContent: ({ content, emojis, $autoplayGifs }) => massageUserText(content, emojis, $autoplayGifs)
+      massagedContent: ({ content, originalStatusEmojis, $autoplayGifs }) => (
+        massageUserText(content, originalStatusEmojis, $autoplayGifs)
+      )
     },
     methods: {
       hydrateContent () {

src/routes/_components/status/StatusDetails.html

@@ -158,7 +158,6 @@
       application: ({ originalStatus }) => originalStatus.application,
       applicationName: ({ application }) => (application && application.name),
       applicationWebsite: ({ application }) => (application && application.website),
-      createdAtDate: ({ originalStatus }) => originalStatus.created_at,
       numReblogs: ({ overrideNumReblogs, originalStatus }) => {
         if (typeof overrideNumReblogs === 'number') {
           return overrideNumReblogs
@@ -171,8 +170,8 @@
         }
         return originalStatus.favourites_count || 0
       },
-      displayAbsoluteFormattedDate: ({ createdAtDate, $isMobileSize }) => (
-        $isMobileSize ? shortAbsoluteDateFormatter : absoluteDateFormatter).format(new Date(createdAtDate)
+      displayAbsoluteFormattedDate: ({ createdAtDateTS, $isMobileSize }) => (
+        ($isMobileSize ? shortAbsoluteDateFormatter : absoluteDateFormatter).format(createdAtDateTS)
       ),
       reblogsLabel: ({ numReblogs }) => {
         // TODO: intl

src/routes/_components/status/StatusSpoiler.html

@@ -64,10 +64,9 @@
       Shortcut
     },
     computed: {
-      emojis: ({ originalStatus }) => originalStatus.emojis,
-      massagedSpoilerText: ({ spoilerText, emojis, $autoplayGifs }) => {
+      massagedSpoilerText: ({ spoilerText, originalStatusEmojis, $autoplayGifs }) => {
         spoilerText = escapeHtml(spoilerText)
-        return emojifyText(spoilerText, emojis, $autoplayGifs)
+        return emojifyText(spoilerText, originalStatusEmojis, $autoplayGifs)
       },
       elementId: ({ uuid }) => `spoiler-${uuid}`
     },

src/routes/_intl/formatTimeagoDate.js

@@ -1,9 +1,10 @@
 import { format } from '../_thirdparty/timeago/timeago'
 import { mark, stop } from '../_utils/marks'
 
-export function formatTimeagoDate (date) {
+export function formatTimeagoDate (date, now) {
   mark('formatTimeagoDate')
-  let res = format(date)
+  // use Math.max() to avoid things like "in 10 seconds" when the timestamps are slightly off
+  let res = format(date, Math.max(now, date))
   stop('formatTimeagoDate')
   return res
 }

src/routes/_store/observers/nowObservers.js

@@ -0,0 +1,47 @@
+// For convenience, periodically re-compute the current time. This ensures freshness of
+// displays like "x minutes ago" without having to jump through a lot of hoops.
+import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
+import lifecycle from 'page-lifecycle/dist/lifecycle.mjs'
+
+const POLL_INTERVAL = 10000
+
+export function nowObservers (store) {
+  let interval
+
+  function updateNow () {
+    store.set({ now: Date.now() })
+  }
+
+  function startPolling () {
+    interval = setInterval(() => scheduleIdleTask(updateNow), POLL_INTERVAL)
+  }
+
+  function stopPolling () {
+    if (interval) {
+      clearInterval(interval)
+      interval = null
+    }
+  }
+
+  function restartPolling () {
+    stopPolling()
+    scheduleIdleTask(updateNow)
+    startPolling()
+  }
+
+  updateNow()
+
+  if (process.browser) {
+    startPolling()
+
+    lifecycle.addEventListener('statechange', e => {
+      if (e.newState === 'passive') {
+        console.log('stopping Date.now() observer...')
+        stopPolling()
+      } else if (e.newState === 'active') {
+        console.log('restarting Date.now() observer...')
+        restartPolling()
+      }
+    })
+  }
+}

src/routes/_store/observers/observers.js

@@ -1,4 +1,5 @@
 import { onlineObservers } from './onlineObservers'
+import { nowObservers } from './nowObservers'
 import { navObservers } from './navObservers'
 import { pageVisibilityObservers } from './pageVisibilityObservers'
 import { resizeObservers } from './resizeObservers'
@@ -8,6 +9,7 @@ import { touchObservers } from './touchObservers'
 
 export function observers (store) {
   onlineObservers(store)
+  nowObservers(store)
   navObservers(store)
   pageVisibilityObservers(store)
   resizeObservers(store)

src/routes/_thirdparty/timeago/timeago.js

@@ -4,7 +4,7 @@
  * Contract: i@hust.cc
  */
 
-var IndexMapEn = 'second_minute_hour_day_week_month_year'.split('_')
+var IndexMapEn = ['second', 'minute', 'hour', 'day', 'week', 'month', 'year']
 var SEC_ARRAY = [60, 60, 24, 7, 365 / 7 / 12, 12]
 
 /**
@@ -63,16 +63,14 @@ function formatDiff (diff) {
  * @param nowDate
  * @returns {number}
  */
-function diffSec (date) {
-  var nowDate = new Date()
-  var otherDate = new Date(date)
-  return (nowDate - otherDate) / 1000
+function diffSec (date, now) {
+  return (now - date) / 1000
 }
 
 /**
  * Created by hustcc on 18/5/20.
  * Contract: i@hust.cc
  */
-export function format (date) {
-  return formatDiff(diffSec(date))
+export function format (date, now) {
+  return formatDiff(diffSec(date, now))
 }