Re: Stopping PEAK application on SIGINT

Which event loop are you using?  Twisted, the PEAK default, or
something else?  The issue here appears to be that the eventLoop
property of the MainLoop instance lacks a `signals()` method -- which
would seem to mean it doesn't fully implement IEventLoop or is the
wrong type of object to start with.

On Tue, Sep 29, 2015 at 8:06 AM, Alexey Smishlayev <[email protected]> wrote:
> Good day everyone!
> I would like my PEAK application to stop on ^C or SIGINT. Currently, in that
> case I get an output something like
>
>> 29.09.2015 14:56:48.179 [DEBUG] Connect.twisted Unexpected error in main
>> loop.
>> 29.09.2015 14:56:48.190 [ERROR] Connect.twisted Traceback (most recent
>> call last):
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/Users/alexey/xtech2/tester/build/lib/ank/BBS/CommandBase.py", line 38, in
>> run
>> 29.09.2015 14:56:48.190 [ERROR]     self.mainLoop.run()
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/Library/Python/2.7/site-packages/peak/running/scheduler.py", line 78, in
>> run
>> 29.09.2015 14:56:48.190 [ERROR]     return
>> self.eventLoop.runUntil(self.exitCode,True,idle=self.sleep)[0]
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/Library/Python/2.7/site-packages/peak/events/twisted_support.py", line
>> 186, in runUntil
>> 29.09.2015 14:56:48.190 [ERROR]     self.reactor.run(False)
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py",
>> line 1192, in run
>> 29.09.2015 14:56:48.190 [ERROR]     self.mainLoop()
>> 29.09.2015 14:56:48.190 [ERROR] --- <exception caught here> ---
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py",
>> line 1204, in mainLoop
>> 29.09.2015 14:56:48.190 [ERROR]     self.doIteration(t)
>> 29.09.2015 14:56:48.190 [ERROR]   File
>> "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/selectreactor.py",
>> line 105, in doSelect
>> 29.09.2015 14:56:48.190 [ERROR]     [], timeout)
>> 29.09.2015 14:56:48.190 [ERROR] exceptions.KeyboardInterrupt:
>
> in the log file. In CommandBase.py attribute self.mainloop is defined as
>
>> from peak.api import binding
>> from peak.running import commands, interfaces
>> class CommandBase(commands.EventDriven):
>>     mainLoop = binding.Obtain(interfaces.IMainLoop)
>>     ...
>
> If I set "peak.running.mainLoop.stopOnSignals" in my project's .ini file to
> anything else except empty tuple, on the application's startup I get the
> following error (I tried "stopOnSignals = ('SIGINT',)")
>
>> Traceback (most recent call last):
>>   File "../ank/BBS/Assembler.py", line 370, in run
>>     _exitCode = _root.run()
>>   File "/Library/Python/2.7/site-packages/peak/running/commands.py", line
>> 229, in run
>>     return self._run() or 0
>>   File "/Library/Python/2.7/site-packages/peak/running/commands.py", line
>> 509, in _run
>>     return self.invoke()
>>   File "/Users/alexey/xtech2/tester/build/lib/ank/BBS/CommandBase.py",
>> line 38, in run
>>     self.mainLoop.run()
>>   File "/Library/Python/2.7/site-packages/peak/running/scheduler.py", line
>> 66, in run
>>     handler = self.eventLoop.signals(*self.stopOnSignals)
>>   File "_once.pyx", line 112, in _once.BaseDescriptor.__get__
>>   File "_once.pyx", line 100, in _once.__get__
>>   File "/Library/Python/2.7/site-packages/peak/binding/components.py",
>> line 682, in delegate
>>     return getattr(getattr(s,delegateAttr),a)
>>   File "_once.pyx", line 112, in _once.BaseDescriptor.__get__
>>   File "_once.pyx", line 100, in _once.__get__
>>   File "/Library/Python/2.7/site-packages/peak/binding/components.py",
>> line 682, in delegate
>>     return getattr(getattr(s,delegateAttr),a)
>>   File "_once.pyx", line 88, in _once.BaseDescriptor.__get__
>> AttributeError: ('Recursive attempt to compute attribute', 'signals')
>
> How do I do everything correctly?
>
>
> Best regards,
> Alexey Smishlayev
>
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