package util
   
   import (
     "fmt"
   
     apiclient "gitee.com/wangyubin/gutils/api_client"
     "gitee.com/wangyubin/gutils/logger"
   )
   
  // request 包含的內容
  type RequestParam struct {
    Api     string
    Method  string
    JsonReq interface{}
    Resp    chan []byte
  }
  
  // 請求隊列, 本質是一個channel
  type RequestQueue struct {
    Queue chan RequestParam
  }
  
  var queue *RequestQueue
  
  // 獲取隊列
  func GetQueue() *RequestQueue {
    return queue
  }
  
  // 初始化隊列
  func InitRequestQueue(size int) {
    queue = &RequestQueue{
      Queue: make(chan RequestParam, size),
    }
  }
  
  // 將請求放入隊列
  func (rq *RequestQueue) Enqueue(p RequestParam) {
    rq.Queue <- p
  }
  
  // 請求隊列服務, 一直等待接受和處理請求
  func (rq *RequestQueue) Run() {
    lg := logger.GetLogger()
    for p := range rq.Queue {
      var resp []byte
      var err error
      switch p.Method {
      case "GET":
        resp, err = apiclient.GetJson(p.Api, p.JsonReq)
      case "POST":
        resp, err = apiclient.PostJson(p.Api, p.JsonReq)
      default:
        err = fmt.Errorf("Wrong type of METHOD(%s)\n", p.Method)
      }
  
      if err != nil {
        lg.Err(err).Msg("access api error: " + p.Api)
        continue
      }
      if p.Resp != nil {
        p.Resp <- resp
        close(p.Resp)
      }
    }
  
    lg.Info().Msg("request queue finished!")
  }

  func (rq *RequestQueue) Run() {
    lg := logger.GetLogger()
    for p := range rq.Queue {
       time.Sleep(1 * time.Second)
       // ... 省略的代碼 ...
    }
  
    lg.Info().Msg("request queue finished!")
  }

func main() {
      // init request queue and start queue service
      util.InitRequestQueue(100)
      queue := util.GetQueue()
      defer close(queue.Queue)
      go queue.Run()
  
      // 其他啟動代碼
  }

   func Request(param1 string, param2 int) error {
   api := "http://xxxx.com"
   api = fmt.Sprintf("%s?period=%s&size=%d", api, param1, param2)
   
    queue := util.GetQueue()
    param := util.RequestParam{
      Api:    api,
      Method: "GET",
     Resp:   make(chan []byte, 1),
   }
   queue.Enqueue(param)
  
   var respData struct {
     Status string       `json:"status"`
     Data   []model.Data `json:"data"`
   }
   var err error
   for resp := range param.Resp {
     err = json.Unmarshal(resp, &respData)
     if err != nil {
       lg.Err(err).Msg("unmarshal json error")
       return err
     }
   }
  
   fmt.Println(respData) 
   return  err
  }