diff --git a/middleware/lru-cache.js b/middleware/lru-cache.js
index 4be27b186..838cc45b9 100644
--- a/middleware/lru-cache.js
+++ b/middleware/lru-cache.js
@@ -36,6 +36,27 @@ module.exports = function(options = {}) {
                 memoryCache.set(key, value, maxAge * 1000);
             }
         },
+
+        /**
+         *
+         * try get from cache.
+         * if not exists use `getValue` function to get value, and put into cahche.
+         *
+         * @param key cache key
+         * @param getValueFunc a function to get value. call it when key not exists.
+         * @param maxAge
+         *
+         * @returns {Promise<void>}
+         */
+        tryGet: async function(key, getValueFunc, maxAge) {
+            let v = await this.get(key);
+            if (!v) {
+                v = await getValueFunc();
+                this.set(key, v, maxAge);
+            }
+
+            return v;
+        },
     };
 
     return async function cache(ctx, next) {
diff --git a/middleware/redis-cache.js b/middleware/redis-cache.js
index 0115fe9fa..6ec659ee9 100644
--- a/middleware/redis-cache.js
+++ b/middleware/redis-cache.js
@@ -57,6 +57,27 @@ module.exports = function(options = {}) {
                 await redisClient.setex(key, maxAge, value);
             }
         },
+
+        /**
+         *
+         * try get from cache.
+         * if not exists use `getValue` function to get value, and put into cahche.
+         *
+         * @param key cache key
+         * @param getValueFunc a function to get value. call it when key not exists.
+         * @param maxAge
+         *
+         * @returns {Promise<void>}
+         */
+        tryGet: async function(key, getValueFunc, maxAge) {
+            let v = await this.get(key);
+            if (!v) {
+                v = await getValueFunc();
+                this.set(key, v, maxAge);
+            }
+
+            return v;
+        },
     };
 
     return async function cache(ctx, next) {
diff --git a/routes/typora/changelog.js b/routes/typora/changelog.js
index b848f6b1f..e0309d18d 100644
--- a/routes/typora/changelog.js
+++ b/routes/typora/changelog.js
@@ -14,13 +14,7 @@ module.exports = async (ctx) => {
 
     const $ = cheerio.load(response.data);
 
-    const parseContent = async (link) => {
-        // Check cache
-        const cache = await ctx.cache.get(link);
-        if (cache) {
-            return Promise.resolve(JSON.parse(cache));
-        }
-
+    const loadContent = async (link) => {
         const response = await axios({
             method: 'get',
             url: link,
@@ -36,17 +30,13 @@ module.exports = async (ctx) => {
         // const author = $('.post-meta span').text();
         const html = $('#pagecontainer').html();
 
-        const result = {
+        return {
             title: title,
             link: link,
             guid: link,
             pubDate: pubDate,
             description: html,
         };
-
-        ctx.cache.set(link, JSON.stringify(result), 3 * 60 * 60);
-
-        return result;
     };
 
     const items = await Promise.all(
@@ -55,7 +45,7 @@ module.exports = async (ctx) => {
             .map(async (item) => {
                 const node = $('a', item);
                 const link = node.attr('href');
-                const result = await parseContent(link);
+                const result = await ctx.cache.tryGet(link, async () => loadContent(link), 3 * 60 * 60);
 
                 return Promise.resolve(result);
             })