Question

Are there any pure wsgi implementation of background task?

I want to use local variables under the same context directly, not serialize/deserialize to another daemon process via a broker.

Is it possible to make this happen under the current wsgi infrastructure? E.g. after return response yield, run some callback functions?

Answer 1

This is a duplicate of question asked on the Python WEB-SIG. I reference the same page as provided in response to the question on the Python WEB-SIG so others can see it:

http://code.google.com/p/modwsgi/wiki/RegisteringCleanupCode

In doing this though, it ties up the request thread and so it would not be able to handle other requests until your task has finished.

Creating background threads at the end of a request is not a good idea unless you do it using a pooling mechanism such that you limit the number of worker threads for your tasks. Because the process can crash or be shutdown, you loose the job as only in memory and thus not persistent.

Better to use Celery, or if you think that is too heavy weight, have a look at Redis Queue (RQ) instead.