[Twisted-Python] Graceful shutdown of Twisted daemon

[Chris Miles]

On 23 Aug 2007, at 18:52, Jean-Paul Calderone wrote:

> On Thu, 23 Aug 2007 18:48:24 +0100, Chris Miles  
> <miles.chris at gmail.com> wrote:
>> I have a Twisted app that is often waiting for child processes  
>> (calls  to external commands).
>>
>> I'd like to make the app gracefully shutdown by default.  As in,  
>> when  the app is killed I want to make sure that any currently  
>> running  child processes can complete and the results of their  
>> work can be  processed before the daemon dies.
>>
>> What would be the best way to achieve this?
>>
>> Can I override the SIGTERM signal handler so that it waits for  
>> other  events to complete before allowing the app to die?
>
> twistd will wait for any Deferred returned by an  
> IService.stopService method
> in the application hierarchy before stopping the reactor and exiting.

Thanks, that seems to be what I wanted.  Which also led me to re- 
writing my service to be a proper IService rather than just piggy  
backing calls onto TimerService.

Cheers
Chris Miles