optimize #78 support disable expire cache index if needed

config.yaml.sample

@@ -28,7 +28,7 @@ Alipay:
 SimpleCacheIndex: # 缓存泡泡广场消息流
   MaxIndexSize: 200             # 最大缓存条数
   CheckTickDuration: 60         # 循环自检查每多少秒一次
-  ExpireTickDuration: 300       # 每多少秒后强制过期缓存
+  ExpireTickDuration: 300       # 每多少秒后强制过期缓存, 设置为0禁止强制使缓存过期
 LoggerFile: # 使用File写日志
   SavePath: data/paopao-ce/logs
   FileName: app

internal/dao/cache_index.go

@@ -15,9 +15,16 @@ func newSimpleCacheIndexServant(getIndexPosts func(offset, limit int) ([]*model.
 		getIndexPosts:   getIndexPosts,
 		maxIndexSize:    s.MaxIndexSize,
 		indexPosts:      make([]*model.PostFormated, 0),
-		indexActionCh:   make(chan core.IndexActionT, 100),                                 // optimize: size need configure by custom
-		checkTick:       time.NewTicker(time.Duration(s.CheckTickDuration) * time.Second),  // check whether need update index every 1 minute
-		expireIndexTick: time.NewTicker(time.Duration(s.ExpireTickDuration) * time.Second), // force expire index every 5 minute
+		indexActionCh:   make(chan core.IndexActionT, 100),                                // optimize: size need configure by custom
+		checkTick:       time.NewTicker(time.Duration(s.CheckTickDuration) * time.Second), // check whether need update index every 1 minute
+		expireIndexTick: time.NewTicker(time.Second),
+	}
+
+	// force expire index every ExpireTickDuration second
+	if s.ExpireTickDuration != 0 {
+		cacheIndex.expireIndexTick.Reset(time.Duration(s.CheckTickDuration) * time.Second)
+	} else {
+		cacheIndex.expireIndexTick.Stop()
 	}
 
 	// start index posts