添加 RSS 侧渲染和抓取缓存

src/pages/rss.xml.ts

@@ -8,9 +8,45 @@ import {
 import { ensureShikiEngine } from '../lib/markdown'
 // import { toMarkdocTree } from '../lib/markdoc'
 import Markdoc from '@markdoc/markdoc'
+import KeyV from 'keyv'
+import { createHash } from 'node:crypto'
 
 export const prerender = false
 
+const renderCache = new KeyV<string>({
+  namespace: 'markdoc-rss',
+})
+
+const _render = async (content: string) => {
+  const key = 'html:' + createHash('sha256').update(content).digest('hex')
+  const cached = await renderCache.get(key)
+
+  if (cached) {
+    return cached
+  }
+
+  const blogTree = Markdoc.transform(Markdoc.parse(content))
+  const html = Markdoc.renderers.html(blogTree)
+
+  await renderCache.set(key, html, 1000 * 60 * 60 * 24)
+  return html
+}
+
+const _getBlog = async (blogId: number) => {
+  const key = `raw:blog-${blogId}`
+  const cached = await renderCache.get(key)
+
+  if (cached) {
+    return cached
+  }
+
+  const content = (await getBlog(blogId))?.content
+  if (content) {
+    await renderCache.set(key, content, 1000 * 60 * 60 * 12)
+  }
+  return content
+}
+
 export const GET = (async (context) => {
   let blogs: ListBlogItemType[] = []
   let pid = 0
@@ -34,18 +70,13 @@ export const GET = (async (context) => {
     site,
     items: await Promise.all(
       blogs.map(async (blog) => {
-        const blogContent =
-          (await getBlog(blog.id))?.content || '博客内容暂不可用'
-        // const blogTree = await toMarkdocTree(blogContent)
-        const blogTree = Markdoc.transform(Markdoc.parse(blogContent))
-        const html = Markdoc.renderers.html(blogTree)
-
+        const blogContent = (await _getBlog(blog.id)) || '博客内容暂不可用'
         const rssItem: RSSFeedItem = {
           title: blog.title,
           description: `一篇由 ${blog.author.nickname} 写的博客`,
           link: `${site}/blogs/${blog.id}`,
           pubDate: new Date(blog.created_at),
-          content: html,
+          content: await _render(blogContent),
           author: blog.author.nickname,
           enclosure: blog.featured_image
             ? {