Django Push HTTP Response to users
Django Push HTTP Response to users
I currently have a very simple web application written in Django, and I would like to implement something like a callback/push notification service in my application.
For example: When one user(client) uploads a photo to the server, the server notifies all other connected users about that photo.
I suppose I can use Django signals to produce a callback when a user uploads a photo, but how do I get Django to post a notification to the other users? This notification could either be alerts or simply redirecting the other users to a new html that displays the uploaded picture. I would prefer the latter.
I am a beginner in web programming, so I am not sure if this fits the bill as needing a 'real-time web application' that implements things like comet or long-polling. My application is similar to that of a chat application, except that I am not submitting text files but image files. Because of that I thought comet solutions would work. I have tried looking at Orbited and Twisted for a very long time now but had no luck in implementing it with Django, probably because I do not understand how to accomplish what I want with comet solutions. I would like the more experienced programmers to point to me what is it exactly that I need in order to accomplish this, or if I am heading into the right direction or not (with comet).
I would really appreciate it if someone could give me some tips and hints as to how to proceed, as well as tutorial links or guides.
You have basically three options when you need to "push" to a client.
(1) Do polling--use Ajax/javascript to poll the server every X amount of time. The smaller the X the more it "feels like" a push, but also the more overhead your server experiences having to constantly respond to these requests.
(2) Use websockets. Part of the HTML5 spec is something called websockets. Websockets allows a browser to open up a persistent connection to a server. Once this connetion has been opened data can be pushed back and forth from client to server and server to client just like with more traditional TCP sockets. The trouble with websockets (last I heard) was that they can still be a bit temperamental between browsers, and of course wont work at all in older browsers.
(3) Use Flash with a Javascript interface. Flash has the capability of setting up persistent TCP connections, which can be used to push/pull data just like with a 'normal' TCP connection. (See this SO question as well: HTTP push examples in Flex)
If you were starting this project from scratch I would recommend you write your backend in Node.js with Socket.io. Socket.io is "socket-like" framework that you can program to and then the Javascript client (which runs in your webbrowser) intelligently determines the best "persistent connection" to use--first it tries to use Websockets, then Flash, then long polling of various types.
But since you've said you want to use Python/Django then you should check out Django-Websockets--a framework for using websockets with Django. But be sure to read the Disclaimer the author puts on the page, there are some significant difficulties/limitations associated with using it, primarily because Django wasn't designed with websockets in mind.
I think your best bet will end up being using Websockets with an intelligent fallback to Ajax Polling when the user's browser doesn't support it.
Django Push HTTP Response to users的更多相关文章
- Django push: Using Server-Sent Events and WebSocket with Django
http://curella.org/blog/2012/jul/17/django-push-using-server-sent-events-and-websocket/ The goal of ...
- Django Request 与Response对象
Django使用请求和响应对象在系统中传递状态.当请求页面时,Django创建一个HttpRequest对象,该对象包含关于请求的元数据. 然后Django加载适当的视图,将HttpRequest作为 ...
- Django中的response
render_to_response render_to_response('index.html', locals(),context_instance=RequestContext(request ...
- Django基础之response对象
与由DJango自动创建的HttpRequest对象相比, HttpResponse对象是我们的职责范围了. 我们写的每个视图都需要实例化, 填充和返回一个HttpResponse. HttpResp ...
- Django Push 的一些资料
先来中文的: 主要讲Orbited: http://sunsetsunrising.com/2009/django_comet.html#gsc.tab=0 再来英文的: http://www.rkb ...
- 《The Django Book》实战--第二章--动态网页基础
这章演示了一些最基本的Django开发动态网页的实例,由于版本不一样,我用的是Django 1.,6.3,有些地方按书上的做是不行的,所以又改了一些,写出来让大家参考. 这是一个用python写的一个 ...
- Django 大文件下载
django提供文件下载时,若果文件较小,解决办法是先将要传送的内容全生成在内存中,然后再一次性传入Response对象中: def simple_file_download(request): # ...
- 跨过Nginx上基于uWSGI部署Django项目的坑
先说说他们的关系,Nginx和uWSGI都是Web服务器,Nginx负责静态内容,uWSGI负责Python这样的动态内容,二者配合共同提供Web服务以实现提高效率和负载均衡等目的.uWSGI实现了多 ...
- Django Middleware简介
1 前言 Django使用非常熟练了,各种API接口不在话下,全都搞定.为方便定位问题在每个API接口的的开始和返回的地方都加上了log打印,记录入参和返回值. 但是这样有一个问题,需要每个 ...
随机推荐
- 为什么说外卖O2O行业的未来在于尖端技术?
7月13日,百度公司董事长兼CEO李彦宏在发布会上谈及百度外卖时表示,百度外卖里有非常多的人工智能技术的应用,比如同样的商家订单,先配送后配送,时间路线规划等等,都有人工智能的技术,涉及机器学习的问题 ...
- html-css样式表
一.CSS:Cascading Style Sheet—层叠样式表,其作用是美化HTML网页. 样式表分类:内联样式表.内嵌样式表.外部样式表 1.内联样式表 和HTML联合显示,控制精确,但是可重用 ...
- bzoj 1191: [HNOI2006]超级英雄Hero
1191: [HNOI2006]超级英雄Hero Time Limit: 10 Sec Memory Limit: 162 MB 二分图匹配... Description 现在电视台有一种节目叫做超 ...
- 关于多线程与CRITICAL_SECTION的使用
CRITICAL_SECTION 只能针对多线程进行锁定,在同一个线程中,是可以进入很多次的. 同一线程可以多次进入临界区. 在测试程序(多线程同时访问CADOAccess类的对象)中,辅助线程不论是 ...
- Java性能提示(全)
http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLi ...
- Asp.Net正在中止线程引发的问题
背景: Asp.Net做的一个同步程序,同步的方法是通过JQuery的Ajax调用,同步过程大概要执行20多分钟,程序部署到服务器后执行一段时间后就弹出执行失败的对话框,日志记录的错误信息是“正在中止 ...
- Python学习笔记(2):数据库访问
本来打算继续用Access的,但费了非常大的劲,还是没有搞定.回过头,发现使用sqlite,简单到令人发指.干脆,把C#的CommonCode往这边迁移,先把AccessDB搬过来再说. 类结构和C# ...
- mysql-5.7.15-winx64免安装版配置
1.拷到硬盘根目录下; 2.在 bin 平行目录下新建 data 文件夹: 3. 修改 my-default.ini 文件,添加 basedir = C:\mysql-5.7.15-winx64d ...
- Scala 深入浅出实战经典 第68讲:Scala并发编程原生线程Actor、Cass Class下的消息传递和偏函数实战解析
王家林亲授<DT大数据梦工厂>大数据实战视频 Scala 深入浅出实战经典(1-87讲)完整视频.PPT.代码下载: 百度云盘:http://pan.baidu.com/s/1c0noOt ...
- MYSQL INSERT INTO SELECT 不插入重复数据
INSERT INTO `b_common_member_count` (uid) SELECT uid FROM `b_common_member` WHERE uid NOT IN (SELECT ...