lastEditTime 字段名调整；修改algolia逻辑

lib/algolia.js

@@ -17,26 +17,88 @@ const generateAlgoliaSearch = async({ allPages, force = false }) => {
 
 /**
  * 上传数据
+ * 根据上次修改文章日期和上次更新索引数据判断是否需要更新algolia索引
  */
-const uploadDataToAlgolia = (post) => {
+const uploadDataToAlgolia = async(post) => {
   // Connect and authenticate with your Algolia app
   const client = algoliasearch(BLOG.ALGOLIA_APP_ID, BLOG.ALGOLIA_ADMIN_APP_KEY)
 
   // Create a new index and add a record
   const index = client.initIndex(BLOG.ALGOLIA_INDEX)
-  const record = {
-    objectID: post.id,
-    title: post.title,
-    category: post.category,
-    tags: post.tags,
-    pageCover: post.pageCover,
-    slug: post.slug,
-    summary: post.summary,
-    content: getPageContentText(post, post.blockMap)
+
+  if (!post) {
+    return
   }
-  index.saveObject(record).wait().then(r => {
-    console.log('Algolia索引', r, record)
-  })
+
+  // 检查是否有索引
+  let existed
+  let needUpdateIndex = false
+  try {
+    existed = await index.getObject(post.id)
+  } catch (error) {
+    // 通常是不存在索引
+  }
+
+  if (!existed || !existed?.lastEditedDate || !existed?.lastIndexDate) {
+    needUpdateIndex = true
+  } else {
+    const lastEditedDate = new Date(existed.lastEditedDate)
+    const lastIndexDate = new Date(existed.lastIndexDate)
+    if (lastEditedDate.getTime() > lastIndexDate.getTime()) {
+      needUpdateIndex = true
+    }
+  }
+
+  // 如果需要更新搜索
+  if (needUpdateIndex) {
+    const record = {
+      objectID: post.id,
+      title: post.title,
+      category: post.category,
+      tags: post.tags,
+      pageCover: post.pageCover,
+      slug: post.slug,
+      summary: post.summary,
+      lastEditedDate: post.lastEditedDate, // 更新文章时间
+      lastIndexDate: new Date(), // 更新索引时间
+      content: truncate(getPageContentText(post, post.blockMap), 9000) // 索引9000个字节，因为api限制总请求内容上限1万个字节
+    }
+    console.log('更新Algolia索引', record)
+    index.saveObject(record).wait().then(r => {
+      console.log('更新成功', r)
+    }).catch(err => {
+      console.log('algolia', err)
+    })
+  }
+}
+
+/**
+ * 限制内容字节数
+ * @param {*} str
+ * @param {*} maxBytes
+ * @returns
+ */
+function truncate(str, maxBytes) {
+  let count = 0
+  let result = ''
+  for (let i = 0; i < str.length; i++) {
+    const code = str.charCodeAt(i)
+    if (code <= 0x7f) {
+      count += 1
+    } else if (code <= 0x7ff) {
+      count += 2
+    } else if (code <= 0xffff) {
+      count += 3
+    } else {
+      count += 4
+    }
+    if (count <= maxBytes) {
+      result += str[i]
+    } else {
+      break
+    }
+  }
+  return result
 }
 
 export { uploadDataToAlgolia, generateAlgoliaSearch }