func (srv *DServ) addTask(rwr http.ResponseWriter, req *http.Request) {
	srv.oplock.Lock()
	defer func() {
		srv.oplock.Unlock()
		req.Body.Close()
	}()
	bodyData, err := ioutil.ReadAll(req.Body)
	rwr.Header().Set("Access-Control-Allow-Origin", "*")
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	var nj NewJob
	if err := json.Unmarshal(bodyData, &nj); err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	dl, err := httpclient.CreateDownloader(nj.Url, nj.FilePath, nj.PartCount)
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	srv.dls = append(srv.dls, dl)
	js, _ := json.Marshal("ok")
	rwr.Write(js)
}
func (srv *DServ) removeTask(rwr http.ResponseWriter, req *http.Request) {
	srv.oplock.Lock()
	defer func() {
		srv.oplock.Unlock()
		req.Body.Close()
	}()
	bodyData, err := ioutil.ReadAll(req.Body)
	rwr.Header().Set("Access-Control-Allow-Origin", "*")
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	var ind int
	if err := json.Unmarshal(bodyData, &ind); err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	if !(len(srv.dls) > ind) {
		http.Error(rwr, "error: id is out of jobs list", http.StatusInternalServerError)
		return
	}

	log.Printf("try stop segment download %v", srv.dls[ind].StopAll())
	srv.dls = append(srv.dls[:ind], srv.dls[ind+1:]...)
	js, _ := json.Marshal("ok")
	rwr.Write(js)
}
func (srv *DServ) startTask(rwr http.ResponseWriter, req *http.Request) {
	srv.oplock.Lock()
	defer func() {
		srv.oplock.Unlock()
		req.Body.Close()
	}()
	bodyData, err := ioutil.ReadAll(req.Body)
	rwr.Header().Set("Access-Control-Allow-Origin", "*")
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	var ind int
	if err := json.Unmarshal(bodyData, &ind); err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	if !(len(srv.dls) > ind) {
		http.Error(rwr, "error: id is out of jobs list", http.StatusInternalServerError)
		return
	}

	if errs := srv.dls[ind].StartAll(); len(errs) > 0 {
		http.Error(rwr, "error: can't start all part", http.StatusInternalServerError)
		return
	}
	js, _ := json.Marshal("ok")
	rwr.Write(js)
}
func (srv *DServ) progressJson(rwr http.ResponseWriter, req *http.Request) {
	defer req.Body.Close()
	rwr.Header().Set("Access-Control-Allow-Origin", "*")
	jbs := make([]DJob, 0, len(srv.dls))
	for ind, i := range srv.dls {
		prs := i.GetProgress()
		var d int64
		var s int64
		for _, p := range prs {
			d = d + (p.Pos - p.From)
			s += p.Speed
		}
		j := DJob{
			Id:         ind,
			FileName:   i.Fi.FileName,
			Size:       i.Fi.Size,
			Progress:   (d * 100 / i.Fi.Size),
			Downloaded: d,
			Speed:      s,
		}
		jbs = append(jbs, j)
	}
	js, err := json.Marshal(jbs)
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		return
	}
	rwr.Write(js)

}
func (srv *DServ) stopAllTask(rwr http.ResponseWriter, req *http.Request) {
	defer func() {
		req.Body.Close()
	}()
	_, err := ioutil.ReadAll(req.Body)
	rwr.Header().Set("Access-Control-Allow-Origin", "*")
	if err != nil {
		http.Error(rwr, err.Error(), http.StatusInternalServerError)
		log.Println(err)
		return
	}
	srv.StopAllTask()
	js, _ := json.Marshal("ok")
	rwr.Write(js)
}