Re: Use Django to implement my GUI!
Hi Jani!
Now you can understand what i meant, but I'm not just try to mec things complicated.
I'm not talking here about my technical implementation, but i'm describing the needs/contraints, and my app architecture to you.
- The remote clients are at the heart of the software system, since data stored in the database are destined to them (the server push each information to the corresponding host)
- When a client starts, it trys to establish a connection with the server, and if succeed, it retrieves its informations from the server. The server then send back informations conerning the host executing the client (the way server retrieves informations from the data base manager doesn't matter here, it's a technical purpose)
- When a task state changes, it has to notify the server by sending a packet through the network. The GUI (web browser) has then to display the new state.
- When a user of the software wants to create a new task on a host, it uses the GUI for the purpose, and the information has to be sent to the remote corresponding client/host for processing.
Tell in my place, what logic would you adopt. I would like idea from you guys in this case, before go on a first definitive choice.
I can see web sockets solves so much problems for developpers, and i'm still looking if it could help achieve correctly what I want to. The problem of IE < 10 for the instance is not so important.
Now also, can you try to advise me the best way for serving file using python-Django (apache, unicorn, ..)?
Thanks again.
2012/5/15 Jani Tiainen <redetin@gmail.com>
Hi,
Now it starts to make "sense".
I just wonder why are you trying to build something so extremely complicated?
What is the rationale behind to have additional middleware layer between web ui and the server backend?
Wouldn't it be sufficient to have architecture like:
Browser <-> django middleware <-> remote backend
Communication between django middle ware and remote backend should be built on top of some messaging system, like celery + rabbitmq which gives you quite standard asyncronous communication between django middleware and remote backend. Of course you might need to write some adapters on remote side but that's part of the job.
Only real problem is that if you need to push changes to browser side. There doesn't exists any really good ways to do that. HTML5 was supposed to bring websockets to overcome the problem. One big problem is that only from IE series only IE 10 supports it. All others, FF, Chrome, Safari has had it for a good while.
There exists also alternative workarounds like Comet, BOSH, push and few others.
So let
15.5.2012 2:18, Eugčne Ngontang kirjoitti:
2012/5/13 Jani Tiainen <redetin@gmail.com <mailto:redetin@gmail.com>>Hi Jani!
I haven't seen the last statements of your post, whre you say I'm not
really clear and that i'm building a non-http GUI using Django.
OK let's stay on the rendering issue only, and specify things simply.
This is a simple description of the architecture I want to set up :
- A Client (not a user interface). Client here means a module which is
installed in a remote computer and communicate with the server via socket.
- A server listening from several remote client (Here i'm not talking
yet about http request), and receive informatons from them. In fact
client must be doing actions and send informations about their actions
to the server. In the oder hand data to be processed by each client is
pushed/dispatched by the server.
- And admin (not Django Admin, but admin in the sens of my app),
destined to be the module allowing use of the application. Then the
Admin module is part of the server and will proviede a GUI for
manipulating data in the data base. It's in this GUI that users of the
application will enter their request, by filling a form or clicking a
link for exemple. And data from the GUI could be stored in the data
base, while being send to the remote clients (not to be displayed by the
client, but to be processed). In the same way, informations comming from
those clients to the server have to be diplayed in the GUI.
With a graphical GUI, The server could have a reference to an object
representing my GUI, and it will be done.
But I choose a web GUI for view and administration. It's where Django comes.
And my problem is to make my server being running a network thread,
receiving data from the GUI(web browser) and sending informations update
to the GUI (for web page content).
This is really my issue. If all the actions of my server depended on my
GUI request (http request), I could do what I like behind when handling
a http request, but while managing http:8080 connexions, the application
is running another process/thread on another TCP/UDP port.
And yes I want a web GUI.
Is why I'm looking the best way to achieve that. We can exclude Django
web server, as it will not be used in production for the application
deployment.
Hope now it's clear for you, and more for the other users.
Thanks!
Hi,
There is several ways to achieve what you maybe want to do. One of
the simplest way is separate frontend (your userinterface) and
server backend. You can build your Django application as a service
(xml-rpc, json-rpc, restful). That would give you advantage to
choose whatever frontend you like. Of course it would add some overhead.
On Sun, May 13, 2012 at 1:14 PM, Eugene NGONTANG<mailto:django-users@googlegroups.com>. <mailto:django-users%2Bunsubscribe@googlegroups.com>.<sympavali@gmail.com <mailto:sympavali@gmail.com>> wrote:
Hi!
I'm a python developper, but new in django.
I'm devolopping a multi clients-server application.
The server and the clients are communicating via sockets, The server
receive somme states from clients, and display them in the User
interface.
In the other hand, the server has to send a message(packet) to the
client when an event occurs in the GUI, and data are stored in a
database.
Note that Django is mainly built for web (HTTP protocol based)
applications. In such an environment you run two different things:
your GUI (usually browser) that is totally ignorant of server side
(Django). Then you send request to some URL, Django routes it to
some view and view produces again next output to be displayed in GUI
(browser again). One of the common functions in the view is database
manipulation.
Then I choose to make a web interface where data could be viewed and
manipulated. And I discovered Django, which fit all my needs. I
tested
and liked the framework.
My questions are:
- Can I override the djando admin methods so that i can not only
customized my views and html page, but also manipulate objects in
database, so that i can do another action when catching an event in
the GUi.
For example, taking the django admin tutorial, I would like to
do and
action like sending a message the user choose "add a poll". How
can I
do those things? Cause I noticed that method that alter data in data
base are part of django admin module and cannot be overriden
You shouldn't "fight against admin". If something cannot be done in
the admin you usually get a way with writing your own stuff.
- To achieve what I want, i would like to run my server engine
and my
django admin in two separated threads. How do i run my admin
module in
a thread? Cause till now i'm using the command line "python
manage.py
runserver
Again your GUI would run "somewhere" (it's not relevant) and it's
not concern of Django. It's architecture is designed to be share
nothing - which means that you can run several threads/processes of
your applications - And those threads/processes are not aware of
other existence. And it doesn't matter.
- I also tried to overide tables name, and foreign keys names. Could
you guys provide me a true life example?
Err.. Override what and where? And how you tried to do that?
- And now in the production step, I would like you guys to tell me
what to choose for serving files. I would like to with your
experience
what's better between running a unicorn server or apache with
mod_wsgi
I don't know if i'm clear, but i hope. In brief I'd like to use the
django framework features to design my Gui like i want, customize
interactions between the gui and the backend, and choose a good web
server for the production.
No you're definitely not clear. My interpretation is that you want
to build (non-http based) GUI using Django as backend server. Even
Django isn't exactly designed for such a work it still can do it.
If it was something else try to split your questions in smaller
fragments, perferably with more clearly specified use cases,
workflows and samples of the code.
Thank you for advance
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