feat 初始化

db/redis/cache_client.go

@@ -48,3 +48,11 @@ func (c *CacheClient) Get(ctx context.Context, key string, dst interface{}) bool
 	}
 	return true
 }
+
+func (c *CacheClient) Exists(ctx context.Context, key ...string) bool {
+	n, err := c.cli.Exists(ctx, key...).Result()
+	if err != nil {
+		return false
+	}
+	return n > 0
+}