/
longpolling.go
77 lines (64 loc) · 1.94 KB
/
longpolling.go
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// Copyright 2013 Beego Samples authors
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
package controllers
import (
"github.com/beego/samples/WebIM/models"
)
// LongPollingController handles long polling requests.
type LongPollingController struct {
baseController
}
// Join method handles GET requests for LongPollingController.
func (this *LongPollingController) Join() {
// Safe check.
uname := this.GetString("uname")
if len(uname) == 0 {
this.Redirect("/", 302)
return
}
// Join chat room.
Join(uname, nil)
this.TplName = "longpolling.html"
this.Data["IsLongPolling"] = true
this.Data["UserName"] = uname
}
// Post method handles receive messages requests for LongPollingController.
func (this *LongPollingController) Post() {
this.TplName = "longpolling.html"
uname := this.GetString("uname")
content := this.GetString("content")
if len(uname) == 0 || len(content) == 0 {
return
}
publish <- newEvent(models.EVENT_MESSAGE, uname, content)
}
// Fetch method handles fetch archives requests for LongPollingController.
func (this *LongPollingController) Fetch() {
lastReceived, err := this.GetInt("lastReceived")
if err != nil {
return
}
events := models.GetEvents(int(lastReceived))
if len(events) > 0 {
this.Data["json"] = events
this.ServeJSON()
return
}
// Wait for new message(s).
ch := make(chan bool)
waitingList.PushBack(ch)
<-ch
this.Data["json"] = models.GetEvents(int(lastReceived))
this.ServeJSON()
}