fix: 降低数据库读压并优化去重查询

src/hooks/useHome.ts

@@ -1,11 +1,13 @@
 import { prisma } from '@/lib/prisma'
 import { getTopTags } from '@/hooks/useProjects'
 import { Prisma } from '@prisma/client'
+import { unstable_cache } from 'next/cache'
 
 const ONE_DAY_MS = 24 * 60 * 60 * 1000
 const DEFAULT_RANKING_LIMIT = 6
 const DEFAULT_TIMELINE_LIMIT = 8
 const DEFAULT_TOP_TAG_LIMIT = 12
+const HOME_PAGE_REVALIDATE_SECONDS = 300
 
 export type HomeProjectSummary = {
   id: string
@@ -137,22 +139,30 @@ async function getTopStarsProjects(limit: number): Promise<HomeProjectSummary[]>
   return projects.map(mapProjectSummary)
 }
 
-export async function getHomePageData(): Promise<HomePageData> {
+function getLatestProjectsByWindow(
+  projects: HomeProjectSummary[],
+  createdAfter: Date,
+  limit: number
+): HomeProjectSummary[] {
+  return projects
+    .filter((project) => new Date(project.createdAt) >= createdAfter)
+    .slice(0, limit)
+}
+
+async function buildHomePageData(): Promise<HomePageData> {
   const now = Date.now()
   const last24Hours = new Date(now - ONE_DAY_MS)
   const last7Days = new Date(now - ONE_DAY_MS * 7)
   const last30Days = new Date(now - ONE_DAY_MS * 30)
+  const latestProjectsLimit = Math.max(DEFAULT_RANKING_LIMIT, DEFAULT_TIMELINE_LIMIT)
 
   const [
     totalProjects,
     newProjects30d,
     newProjects7d,
     newProjects24h,
-    latest24h,
-    latest7d,
-    latest30d,
+    latestProjects,
     topStars,
-    timeline,
     topTags,
   ] = await Promise.all([
     safeQuery('countTotalProjects', 0, () => prisma.project.count()),
@@ -186,14 +196,28 @@ export async function getHomePageData(): Promise<HomePageData> {
         },
       })
     ),
-    getLatestProjects(DEFAULT_RANKING_LIMIT, last24Hours),
-    getLatestProjects(DEFAULT_RANKING_LIMIT, last7Days),
-    getLatestProjects(DEFAULT_RANKING_LIMIT, last30Days),
+    getLatestProjects(latestProjectsLimit),
     getTopStarsProjects(DEFAULT_RANKING_LIMIT),
-    getLatestProjects(DEFAULT_TIMELINE_LIMIT),
     getTopTags(DEFAULT_TOP_TAG_LIMIT),
   ])
 
+  const latest24h = getLatestProjectsByWindow(
+    latestProjects,
+    last24Hours,
+    DEFAULT_RANKING_LIMIT
+  )
+  const latest7d = getLatestProjectsByWindow(
+    latestProjects,
+    last7Days,
+    DEFAULT_RANKING_LIMIT
+  )
+  const latest30d = getLatestProjectsByWindow(
+    latestProjects,
+    last30Days,
+    DEFAULT_RANKING_LIMIT
+  )
+  const timeline = latestProjects.slice(0, DEFAULT_TIMELINE_LIMIT)
+
   return {
     overview: {
       totalProjects,
@@ -221,3 +245,12 @@ export async function getHomePageData(): Promise<HomePageData> {
     timeline,
   }
 }
+
+const getCachedHomePageData = unstable_cache(buildHomePageData, ['home-page-data:v1'], {
+  revalidate: HOME_PAGE_REVALIDATE_SECONDS,
+  tags: ['home-page-data'],
+})
+
+export async function getHomePageData(): Promise<HomePageData> {
+  return getCachedHomePageData()
+}