[Twisted-Python] twistd save state does not work

[Remi Cool]

Jean-Paul Calderone wrote:
> On Fri, 29 Sep 2006 16:53:10 +0200, Remi Cool 
> <mailinglists at smartology.nl> wrote:
>> Remi Cool wrote:
>>> Hello,
>>>
>>> I've readied my app for use with twistd, the daemonizing works, but 
>>> a tap file is not saved upon exit (kill 'cat twisted.pid'). How can 
>>> I enable the save state option? BTW I'm not using the -o option with 
>>> twistd ;)
>>>
>>> Second ... is it possible to disable the twisted logging if you use 
>>> twistd to start the app? Or is it possible to set a log level so 
>>> that only warnings and errors are shown and my log is not flooded 
>>> with (TCPServer) connection messages.
>> The save state function only seems to work when you start with a tap 
>> in the firstplace. It then saves the state in appname-shutdown.tap 
>> ... ok but why doesn't it work when you start from a python file?
>>
>
> It's implicitly disabled when loading an application from a Python file,
> since there is no guarantee that the application will be serializable.
>
> There is no way to explicitly re-enable it.  I would suggest that this
> feature be added, but since most people seem to think tap files should
> be eliminated as soon as possible, pursuing this would probably involve
> a lot of debate that I'm not personally interested in participating in.
>
> I would suggest using an alternate mechanism for persistence.
>
It was an interesting feature but if tap is almost obsolete, I won't bother.

>> My 2nd question about the logging still stands ...
>
> It's not, although it certainly should be.  I believe there is at least
> one ticket open in the tracker for improving the logging features of
> twistd.
>
:)
>> and is it possible to (re)set the name of the log file in the python 
>> file where application is defined? I have all paths for the app in an 
>> ini file (configParser) and it would not be a good solution to 
>> declare the logfile path somewhere else.
>
> The next release of Twisted will include a much more extensible way to
> interact with twistd which should satisfy this use-case.  If you want
> to play with it in svn trunk at HEAD, you can take a look at the output of
> `twistd --help'.  The command list which shows up at the end of that
> output can be extending using the plugin system, so you can add your
> command, which sets up logging or loads configuration from an ini, or
> whatever else you like.
>
Why not incorporate python logging into twisted? That way is easyer to 
incorporate modules without having to 'bother' with twisted. Or use 
modules which are not especially written for twisted.


- Remi -