Redirecting django app webpages through celery task

[Mohammed Noor]

Hello guys,

I need to create  a django application that takes a repository url, builds the code located in the url location and runs a few tests. If the tests are successfull, it tags the code and then sends an email to the user notifying the same. 

Because the building process takes a long time, I have used celery to run it as a background process. I am implementing the following design.

def main_function(request):

          # lines_of_code

          result=tasks.BuildCodeAndVerify.delay(args)

          #few more lines of code

          return (request,'waiting_page.html',context)

Note: The waiting page has a progress bar that reads percentage progress from my celery task i.e BuildCodeAndVerify. 

Now, I am facing two problems:

1. If the build is successful, i need to redirect from the waiting page and update the html view with a success page and a summary of the build. How do i make the celery task redirect a webpage? Also, it needs to pass a dictionary to the webpage containing a summary. How do i do all this?

2. Is it possible to pass the request object as an argument like  BuildCodeAndVerify(request,other_args). Because whenever I try i get an error saying. "WSGI error: type object is not JSON serializable." 

And I have very limited django and python knowledge so please go easy on me if my questions look naive. 

Would be grateful for any help and advice i can get.

Thanks a lot!

Khasim

[Jason]

1, you can't.  you can expose an URL and view for your client-side app to request for task state.  if response of state is "SUCCESS", then you can trigger a client side redirect.

2. when using celery, pass in only the data it's needed, such as a db record ID, and do all your retrievals inside the task.

Some reading for celery best practices:

https://denibertovic.com/posts/celery-best-practices/

https://blog.balthazar-rouberol.com/celery-best-practices

https://khashtamov.com/en/celery-best-practices-practical-approach/

[Mohammed Noor]

But isn't request a multi object type dictionary? What's the problem with passing a dictionary as a parameter.

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