From f7ac03ee94d9d32e26bd712e8dc05a6109f5e835 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Mon, 28 Feb 2022 15:13:56 +0100
Subject: [PATCH] Fix client html performance regression

---
 server/helpers/markdown.ts       |  4 ++--
 server/initializers/constants.ts |  4 +++-
 server/lib/client-html.ts        | 14 +++++++++++---
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/server/helpers/markdown.ts b/server/helpers/markdown.ts
index 25685ec6d..41c1186ec 100644
--- a/server/helpers/markdown.ts
+++ b/server/helpers/markdown.ts
@@ -8,7 +8,7 @@ const markdownItEmoji = require('markdown-it-emoji/light')
 const MarkdownItClass = require('markdown-it')
 
 const markdownItWithHTML = new MarkdownItClass('default', { linkify: true, breaks: true, html: true })
-const markdownItWithoutHTML = new MarkdownItClass('default', { linkify: true, breaks: true, html: false })
+const markdownItWithoutHTML = new MarkdownItClass('default', { linkify: false, breaks: true, html: false })
 
 const toSafeHtml = (text: string) => {
   if (!text) return ''
@@ -66,7 +66,7 @@ function plainTextPlugin (markdownIt: any) {
 
       if (token.type === 'list_item_close') {
         lastSeparator = ', '
-      } else if (/[a-zA-Z]+_close/.test(token.type)) {
+      } else if (token.type.endsWith('_close')) {
         lastSeparator = ' '
       } else if (token.content) {
         text += lastSeparator
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 4d2a6fc63..2367e7689 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -718,10 +718,12 @@ const MEMOIZE_TTL = {
   OVERVIEWS_SAMPLE: 1000 * 3600 * 4, // 4 hours
   INFO_HASH_EXISTS: 1000 * 3600 * 12, // 12 hours
   LIVE_ABLE_TO_UPLOAD: 1000 * 60, // 1 minute
-  LIVE_CHECK_SOCKET_HEALTH: 1000 * 60 // 1 minute
+  LIVE_CHECK_SOCKET_HEALTH: 1000 * 60, // 1 minute
+  MD_TO_PLAIN_TEXT_CLIENT_HTML: 1000 * 60 // 1 minute
 }
 
 const MEMOIZE_LENGTH = {
+  MD_TO_PLAIN_TEXT_CLIENT_HTML: 100,
   INFO_HASH_EXISTS: 200
 }
 
diff --git a/server/lib/client-html.ts b/server/lib/client-html.ts
index c010f3c44..945bc712f 100644
--- a/server/lib/client-html.ts
+++ b/server/lib/client-html.ts
@@ -1,5 +1,6 @@
 import express from 'express'
 import { readFile } from 'fs-extra'
+import memoizee from 'memoizee'
 import { join } from 'path'
 import validator from 'validator'
 import { toCompleteUUID } from '@server/helpers/custom-validators/misc'
@@ -20,6 +21,8 @@ import {
   CUSTOM_HTML_TAG_COMMENTS,
   EMBED_SIZE,
   FILES_CONTENT_HASH,
+  MEMOIZE_LENGTH,
+  MEMOIZE_TTL,
   PLUGIN_GLOBAL_CSS_PATH,
   WEBSERVER
 } from '../initializers/constants'
@@ -32,6 +35,11 @@ import { MAccountActor, MChannelActor } from '../types/models'
 import { getBiggestActorImage } from './actor-image'
 import { ServerConfigManager } from './server-config-manager'
 
+const getPlainTextDescriptionCached = memoizee(mdToOneLinePlainText, {
+  maxAge: MEMOIZE_TTL.MD_TO_PLAIN_TEXT_CLIENT_HTML,
+  max: MEMOIZE_LENGTH.MD_TO_PLAIN_TEXT_CLIENT_HTML
+})
+
 type Tags = {
   ogType: string
   twitterCard: 'player' | 'summary' | 'summary_large_image'
@@ -104,7 +112,7 @@ class ClientHtml {
       res.status(HttpStatusCode.NOT_FOUND_404)
       return html
     }
-    const description = mdToOneLinePlainText(video.description)
+    const description = getPlainTextDescriptionCached(video.description)
 
     let customHtml = ClientHtml.addTitleTag(html, video.name)
     customHtml = ClientHtml.addDescriptionTag(customHtml, description)
@@ -165,7 +173,7 @@ class ClientHtml {
       return html
     }
 
-    const description = mdToOneLinePlainText(videoPlaylist.description)
+    const description = getPlainTextDescriptionCached(videoPlaylist.description)
 
     let customHtml = ClientHtml.addTitleTag(html, videoPlaylist.name)
     customHtml = ClientHtml.addDescriptionTag(customHtml, description)
@@ -264,7 +272,7 @@ class ClientHtml {
       return ClientHtml.getIndexHTML(req, res)
     }
 
-    const description = mdToOneLinePlainText(entity.description)
+    const description = getPlainTextDescriptionCached(entity.description)
 
     let customHtml = ClientHtml.addTitleTag(html, entity.getDisplayName())
     customHtml = ClientHtml.addDescriptionTag(customHtml, description)