feat: use cache to avoid database access (#158)

middleware/distributor.go

@@ -17,7 +17,7 @@ type ModelRequest struct {
 func Distribute() func(c *gin.Context) {
 	return func(c *gin.Context) {
 		userId := c.GetInt("id")
-		userGroup, _ := model.GetUserGroup(userId)
+		userGroup, _ := model.CacheGetUserGroup(userId)
 		c.Set("group", userGroup)
 		var channel *model.Channel
 		channelId, ok := c.Get("channelId")
@@ -73,7 +73,7 @@ func Distribute() func(c *gin.Context) {
 					modelRequest.Model = "text-moderation-stable"
 				}
 			}
-			channel, err = model.GetRandomSatisfiedChannel(userGroup, modelRequest.Model)
+			channel, err = model.CacheGetRandomSatisfiedChannel(userGroup, modelRequest.Model)
 			if err != nil {
 				c.JSON(200, gin.H{
 					"error": gin.H{