Latching signal handling?

[Simon Haines]

Some of my modules used as CherryPy applications spin up their own threads (via threading.Timer) for background processing. However, I can't find a way to latch cherrypy.engine.signal_handler or cherrypy.engine.console_control_handler to properly clean things up when Ctrl-C is pressed on a Linux/Windows console.

My server startup code looks like this (Python 2.7.1, CherryPy 3.1.2):

# Register of background jobs

jobs = []

def handle_terminate(event):

  for job in jobs:

    print('Terminating %s' % job.name)

    job.stop()

if hasattr(engine, 'signal_handler'):

  engine.signal_handler.set_handler('SIGTERM', handle_terminate)

  engine.signal_handler.subscribe()

if hasattr(engine, 'console_control_handler'):

  # Best guess as there is no documentation for console_control_handler

  engine.console_control_handler.set_handler('SIGTERM', handle_terminate)

  engine.console_control_handler.subscribe()

Obviously I'd like to register a listener for the Ctrl-C signal, have the listener clean up the background jobs, and then chain the default handler. Without this, the server never terminates waiting for other threads to finish. Is this possible?

Thanks, Simon.

[Sylvain Hellegouarch]

Hi Simon,

You might simple want to subscribe your function to the CherryPy engine as follow:

cherrypy.engine.subscribe('exit',  handle_terminate)

That function should not take any arguments though.

- Sylvain

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[Simon Haines]

Hi Sylvian, thanks for this idea. Much cleaner than my current solution which is to set the timer threads as daemonized so the process need not wait for them to finish.

Simon.

On Monday, May 14, 2012 11:42:14 PM UTC+10, Sylvain Hellegouarch wrote:

Hi Simon,

You might simple want to subscribe your function to the CherryPy engine as follow:

cherrypy.engine.subscribe('exit',  handle_terminate)

That function should not take any arguments though.

- Sylvain

On Mon, May 14, 2012 at 3:45 AM, Simon Haines wrote:

Some of my modules used as CherryPy applications spin up their own threads (via threading.Timer) for background processing. However, I can't find a way to latch cherrypy.engine.signal_handler or cherrypy.engine.console_control_handler to properly clean things up when Ctrl-C is pressed on a Linux/Windows console.

My server startup code looks like this (Python 2.7.1, CherryPy 3.1.2):

# Register of background jobs

jobs = []

def handle_terminate(event):

  for job in jobs:

    print('Terminating %s' % job.name)

    job.stop()

if hasattr(engine, 'signal_handler'):

  engine.signal_handler.set_handler('SIGTERM', handle_terminate)

  engine.signal_handler.subscribe()

if hasattr(engine, 'console_control_handler'):

  # Best guess as there is no documentation for console_control_handler

  engine.console_control_handler.set_handler('SIGTERM', handle_terminate)

  engine.console_control_handler.subscribe()

Obviously I'd like to register a listener for the Ctrl-C signal, have the listener clean up the background jobs, and then chain the default handler. Without this, the server never terminates waiting for other threads to finish. Is this possible?

Thanks, Simon.

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