Question

I have a django application running under twisted.
I have server.py with the following code: http://slexy.org/view/s21TBxGPut
When I run server.py with twisted I get the following exception: http://slexy.org/view/s2WqQDMvsh

The exception is caused by the last 2 lines in server.py. If I comment these lines, I have no exception.
I have no idea how to debug such thing.
Maybe someone has an idea what am I doing wrong?

Thanks a lot, Arshavski Alexander.

Answer 1

Your TimerService is constructed wrong:

ts2 = TimerService(3600, call_command("tamarin_pull_logs"))

This is the same as:

some_func = call_command("tamarin_pull_logs")
ts2 = TimerService(3600, some_func)

What does call_command return? It’s not part of your paste, but since your exception is:

exceptions.TypeError: 'NoneType' object is not callable

I’m going to guess that it returns None. And None is not callable, as the exception points out.

You set up the first TimerService correctly:

ts = TimerService(86400, check_all_notifications)

Notice that you’re not calling check_all_notifications in that statement. You’re passing it to TimerService. You need to do the same for your other service:

ts2 = TimerService(3600, call_command, "tamarin_pull_logs")

It just so happens that TimerService is constructed to support calling a function with some arguments, so it accepts both the callable and arbitrary extra arguments and passes those arguments on to the callable whenever it is time to call it.