beego websocket应用

package controllers

import (
	"encoding/json"
	"github.com/astaxie/beego"
	"github.com/gorilla/websocket"
	"net/http"
	"youku/models"
)

type BarrageController struct {
	beego.Controller
}

type WsData struct {
	CurrentTime int
	EpisodesId  int
}

var (
	// 跨域
	upgrader = websocket.Upgrader{
		CheckOrigin: func(r *http.Request) bool {
			return true
		},
	}
)

// 获取弹幕websocket
// @router /barrage/ws [*]
func (this *BarrageController) BarrageWs() {
	var (
		conn     *websocket.Conn
		err      error
		data     []byte
		barrages []models.BarrageData
	)
	if conn, err = upgrader.Upgrade(this.Ctx.ResponseWriter, this.Ctx.Request, nil); err != nil {
		goto ERR
	}
	for {
		if _, data, err = conn.ReadMessage(); err != nil {
			goto ERR
		}
		var wsData WsData
		// 获取json数据
		json.Unmarshal([]byte(data), &wsData)
		endTime := wsData.CurrentTime + 60 // 一分钟内的弹幕
		// 获取弹幕列表
		_, barrages, err = models.BarrageList(wsData.EpisodesId, wsData.CurrentTime, endTime)
		if err == nil {
			// 发送数据
			if err := conn.WriteJSON(barrages); err != nil {
				goto ERR
			}
		}
	}

ERR:
	conn.Close()
}