Javascript-Python: serve dynamically generated images to client browser?

Question

Scenario: User loads a page, image is being generated, show loading bar, notification event sent to browser.

I am using python code to generate the image. Would it be ideal to have a web server that launches the script or embed a webserver code into the python script? Once the image is finished rendering, the client should receive a message saying it's successful and display the image.

How can this be architected to support concurrent users as well? Would simply launching the python script for each new user that navigates to the web page suffice?

Would it be overkill to have real-time web application for this scenario? Trying to decide whether simple jQuery AJAX will suffice or Socket.io should be used to have a persistent connection between server and client.

Any libraries out there that fit my needs?

Joe M. · Accepted Answer · 2012-09-19 16:28:16Z

1

I would recommend not spawning a new child for every request, but rather using some task queue management tool, for example I can reccomend celery.

You could for example run a threaded python webserver which would spawn one task for each request. Each client could then ask periodically (javascript/jquery) if the task is finished, and if so, server would return proper image address. Also, celery has web-callbacks which could be used in this case. (I think, I have not used this feature myself).

I would not lose time with writing some ad-hoc solution, since this is simple, easy to deploy, well documented and scales very well.

answered Sep 19, 2012 at 16:28

Joe M.

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2 Comments

KJW Over a year ago

how is celery different from github's resque?

Joe M. Over a year ago

It is designed for python; I am not familiar with resque, but from the spec, I think it is similar.

3on · Accepted Answer · 2012-09-19 16:18:45Z

1

I personally love Socket.IO and I would to it with it. Because it would be simpler a way. But that may be a bit too much work to set up just for that. Especially since it is not that simple in Python from what I heard compare to node where it really is about 10 lines server side.

Without Socket.IO could do a long polling to get the status of the image processing, and get the url at the end, of the image in base64 if that is what you want.

answered Sep 19, 2012 at 16:18

3on

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