Events for startup/shutdown?

[Andreas Jung]

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Hi there,

any chance to capture the startup and shutdown of a Pyramid service?
I want to capture start/stop of Pyramid as event in our central
monitoring service.

Andreas
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[Michael Merickel]

WSGI is a pure request-level protocol, it does not handle or care how it is served. As a result, a WSGI app (such as Pyramid) has no concept of when the service begins or ends. The closest you'll get to this is a startup hook such as your main() or ApplicationCreated for tracking the start. The other option is to hope that your server has hooks that can be used to track this. Finally, process state can be monitored externally via supervisor or some other process monitor.

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[Andreas Jung]

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Michael Merickel wrote:
> WSGI is a pure request-level protocol, it does not handle or care how
> it is served. As a result, a WSGI app (such as Pyramid) has no
> concept of when the service begins or ends.

As Zope veteran, I know :-) I am asking about the backend, not the WSGI
level.

> The closest you'll get to this is a startup hook such as your main()
> or ApplicationCreated for tracking the start.

ACK for the startup

> The other option is to hope that your server has hooks that can be
> used to track this. Finally, process state can be monitored
> externally via supervisor or some other process monitor.

I am still missing for the shutdown phase. Supervisord...is an option
but I want to have something in my app. I tried using an atexit handler
but it is never executed.

- -aj

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[Luis Aguirre]

Hi Andreas,

You may capture signals from python to get the shutdown.  Using SIGINT is the most common way to stop an application gracefully.  You may see an example here: http://stackoverflow.com/questions/1112343/how-do-i-capture-sigint-in-python .

Best regards,

Luis Aguirre

2013/1/25 Andreas Jung <li...@zopyx.com>

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[Andreas Jung]

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Problem solved for now. My atexit.register() handler is now called
when I used pserve without --reload option. Using --reload cause
the handler being ignored.

Andreas

Luis Aguirre wrote:
> Hi Andreas,
>
> You may capture signals from python to get the shutdown. Using
> SIGINT is the most common way to stop an application gracefully. You
> may see an example here:
> http://stackoverflow.com/questions/1112343/how-do-i-capture-sigint-in-python
> .
>
> Best regards,
>
> Luis Aguirre
>

> 2013/1/25 Andreas Jung <li...@zopyx.com <mailto:li...@zopyx.com>>

>
>
>
> Michael Merickel wrote:
>> WSGI is a pure request-level protocol, it does not handle or care
>> how it is served. As a result, a WSGI app (such as Pyramid) has no
>> concept of when the service begins or ends.
>
> As Zope veteran, I know :-) I am asking about the backend, not the
> WSGI level.
>
>> The closest you'll get to this is a startup hook such as your
>> main() or ApplicationCreated for tracking the start.
>
> ACK for the startup
>
>> The other option is to hope that your server has hooks that can be
>> used to track this. Finally, process state can be monitored
>> externally via supervisor or some other process monitor.
>
> I am still missing for the shutdown phase. Supervisord...is an
> option but I want to have something in my app. I tried using an
> atexit handler but it is never executed.
>

> -aj

>
>
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