feat(Cache): implement Cache

Author: leeyeh

.editorconfig

@@ -0,0 +1,7 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true

gulpfile.babel.js

@@ -255,4 +255,3 @@ gulp.task('dev', [
     'babel-demo'
   ]).on('change', reload);
 });
-

src/av.js

@@ -19,6 +19,7 @@ AV._ = require('underscore');
 AV.version = require('./version');
 AV.Promise = require('./promise');
 AV.localStorage = require('./localstorage');
+AV.Cache = require('./Cache');
 
 // 挂载所有内部配置项
 AV._config = AV._config || {};

src/cache.js

@@ -0,0 +1,34 @@
+'use strict';
+const storage = require('./localstorage');
+const AV = require('./av');
+
+exports.get = (key) => {
+  return storage.getItemAsync(`${AV.applicationId}/${key}`)
+    .then(cache => {
+      try {
+        cache = JSON.parse(cache);
+      } catch (e) {
+        return null;
+      }
+      if (cache) {
+        const expired = cache.expiredAt && cache.expiredAt < Date.now();
+        if (!expired) {
+          return cache.value;
+        }
+      }
+      return null;
+    });
+};
+
+exports.set = (key, value, ttl) => {
+  const cache = {
+    value
+  };
+  if (typeof ttl === 'number') {
+    cache.expiredAt = Date.now() + ttl;
+  }
+  return storage.setItemAsync(
+    `${AV.applicationId}/${key}`,
+     JSON.stringify(cache)
+   );
+};

src/utils.js

@@ -7,6 +7,7 @@
 
 const _ = require('underscore');
 const ajax = require('./browserify-wrapper/ajax');
+const Cache = require('./cache');
 
 const init = (AV) => {
 
@@ -115,7 +116,29 @@ const init = (AV) => {
     AV._useMasterKey = false;
   };
 
-  const setRegionServer = (region) => {
+  const setRegionServer = (region = 'cn') => {
+    // AVConfig.region = region;
+    // AVConfig.APIServerURL = API_HOST[region];
+    // if (region === 'cn') {
+    //   Cache.get('APIServerURL').then(cachedServerURL => {
+    //     if (cachedServerURL) {
+    //       return cachedServerURL;
+    //     } else {
+    //       return ajax('get', `http://app-router.leancloud.cn/route?appId=${AV.applicationId}`)
+    //         .then(servers => {
+    //           if (servers.api_server) {
+    //             Cache.set('APIServerURL', servers.api_server, 30 * 24 * 3600000);
+    //             return servers.api_server;
+    //           }
+    //         });
+    //     }
+    //   }).then(serverURL => {
+    //     if (AVConfig.APIServerURL === API_HOST[region]) {
+    //       AVConfig.APIServerURL = serverURL;
+    //     }
+    //   })
+    // }
+
     // 服务器地区选项，默认为中国大陆
     switch (region) {
       case 'us':

test/cache.js

@@ -0,0 +1,17 @@
+var Cache = AV.Cache;
+const wait = time => new Promise(resolve => setTimeout(resolve, time));
+
+describe('Cache', () => {
+  const getValue = () => Cache.get('__test');
+  it('get/set', () =>
+    Cache.set('__test', 1).then(getValue).then(value => {
+      expect(value).to.be(1);
+      return Cache.set('__test', '1', 100).then(getValue);
+    }).then(value => {
+      expect(value).to.be('1');
+      return wait(110).then(getValue);
+    }).then(value => {
+      expect(value).to.be(null);
+    })
+  );
+});

test/test.html

@@ -25,6 +25,7 @@
     </script>
 	<script src="promise.js"></script>
   <script src="storage.js"></script>
+  <script src="cache.js"></script>
 	<script src="file.js"></script>
 	<script src="error.js"></script>
 	<script src="object.js"></script>