使用ttl方法来取代exist判断键值是否存在

app/Library/Cache/Backend/Redis.php

@@ -186,6 +186,23 @@ class Redis extends \Phalcon\Cache\Backend\Redis
         return (bool)$redis->exists($lastKey);
     }
 
+    /**
+     * @param string $keyName
+     * @return int|bool
+     */
+    public function ttl($keyName = null)
+    {
+        $redis = $this->getRedis();
+
+        if ($keyName === null) {
+            $lastKey = $this->_lastKey;
+        } else {
+            $lastKey = $this->getKeyName($keyName);
+        }
+
+        return $redis->ttl($lastKey);
+    }
+
     /**
      * {@inheritdoc}
      *

app/Services/Throttle.php

@@ -19,18 +19,18 @@ class Throttle extends Service
 
         $cacheKey = $this->getCacheKey($sign);
 
+        if ($cache->ttl($cacheKey) < 1) {
+            $cache->save($cacheKey, 0, $config->path('throttle.lifetime'));
+        }
+
         $rateLimit = $cache->get($cacheKey);
 
-        if ($rateLimit) {
-            if ($rateLimit >= $config->path('throttle.rate_limit')) {
-                return false;
-            } else {
-                $cache->increment($cacheKey, 1);
-            }
-        } else {
-            $cache->save($cacheKey, 1, $config->path('throttle.lifetime'));
+        if ($rateLimit >= $config->path('throttle.rate_limit')) {
+            return false;
         }
 
+        $cache->increment($cacheKey, 1);
+
         return true;
     }