add file cache support

lib/DirScanner.php

@@ -620,6 +620,16 @@ Class DirScanner {
         return $this->scanResults;
     }
 
+    //设置扫描结果，以支持缓存
+    public function setScanResults($data) {
+        $this->scanResults = $data;
+    }
+
+    //设置tree，以支持缓存
+    public function setTreeData($data) {
+        $this->tree = $data;
+    }
+
     //获取菜单，扫描结果中的目录结构
     public function getMenus($tree = array()) {
         $results = empty($tree) ? $this->tree : $tree;

plugins/Common.php

@@ -528,4 +528,56 @@ Class Common {
         return preg_replace("/^(.{3,})\d{4}(.{4})$/i", '$1****$2', $cellphone);
     }
 
+    //保存数据到文件缓存
+    //缓存数据格式：{ctime: timestamp, data: anything}
+    public static function saveCacheToFile($key, $data) {
+        $cacheData = array(
+            "ctime" => time(),
+            "data" => $data,
+        );
+        $jsonData = json_encode($cacheData);
+        $cacheDir = __DIR__ . '/../runtime/cache/';
+
+        if (!is_dir($cacheDir)) {
+            mkdir($cacheDir, 0700, true);
+        }
+
+        $cache_filename = "{$cacheDir}{$key}.json";
+        return file_put_contents($cache_filename, $jsonData);
+    }
+
+    //从文件缓存读取数据
+    //expireSeconds: 缓存失效时间，默认10分钟
+    public static function getCacheFromFile($key, $expireSeconds = 600) {
+        $cacheDir = __DIR__ . '/../runtime/cache/';
+        $cache_filename = "{$cacheDir}{$key}.json";
+
+        if (file_exists($cache_filename)) {
+            $jsonData = file_get_contents($cache_filename);
+            $data = json_decode($jsonData, true);
+
+            //如果缓存没有失效
+            $now = time();
+            if ($now - $data['ctime'] <= $expireSeconds) {
+                return $data['data'];
+            }else {
+                return null;
+            }
+        }
+
+        return false;
+    }
+
+    //删除缓存文件
+    public static function cleanFileCache($key) {
+        $cacheDir = __DIR__ . '/../runtime/cache/';
+        $cache_filename = "{$cacheDir}{$key}.json";
+
+        if (file_exists($cache_filename)) {
+            return unlink($cache_filename);
+        }
+
+        return false;
+    }
+
 }

themes/beauty/controller/SiteController.php

@@ -4,6 +4,7 @@
  */
 require_once __DIR__ . '/../../../lib/DirScanner.php';
 require_once __DIR__ . '/../../../plugins/Parsedown.php';
+require_once __DIR__ . '/../../../plugins/Common.php';
 
 Class SiteController extends Controller {
 
@@ -16,8 +17,30 @@ Class SiteController extends Controller {
         
         $scanner = new DirScanner();
         $scanner->setWebRoot(FSC::$app['config']['content_directory']);
+
+        //优先从缓存读取数据
+        $cacheKey = 'allFilesTree';
+        $cachedData = Common::getCacheFromFile($cacheKey);
+        if (!empty($cachedData)) {
+            $dirTree = $cachedData;
+            $scanner->setTreeData($cachedData);
+        }else {
             $dirTree = $scanner->scan(__DIR__ . '/../../../www/' . FSC::$app['config']['content_directory'], 4);
+            Common::saveCacheToFile($cacheKey, $dirTree);
+        }
+
+        //优先从缓存读取数据
+        $cacheKey = 'allFilesData';
+        $cachedData = Common::getCacheFromFile($cacheKey);
+        if (!empty($cachedData)) {
+            $scanResults = $cachedData;
+            $scanner->setScanResults($cachedData);
+        }else {
             $scanResults = $scanner->getScanResults();
+            Common::saveCacheToFile($cacheKey, $scanResults);
+        }
+
+
         //获取目录
         $menus = $scanner->getMenus();
 
@@ -62,6 +85,7 @@ Class SiteController extends Controller {
             $mp3File = $scanner->getDefaultFile('mp3');
         }
 
+
         //翻页支持
         $page = $this->get('page', 1);
         $pageSize = $this->get('limit', 24);
@@ -75,8 +99,8 @@ Class SiteController extends Controller {
         }
         $viewName = 'index';
         $params = compact(
-            'cateId', 'dirTree', 'scanResults', 'menus', 'htmlReadme', 'htmlCateReadme',
+            'cateId', 'page', 'pageSize',
-            'mp3File', 'page', 'pageSize'
+            'dirTree', 'scanResults', 'menus', 'htmlReadme', 'htmlCateReadme', 'mp3File'
         );
         return $this->render($viewName, $params, $pageTitle);
     }