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Hello!<br>
<br>
The application runs successfully with my patch applied and it even
reacts gracefully to the ^C, so you could say that the desired
behavior is achieved. I've done it with the following patch:<br>
<br>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
def _patchSelector(self):<br>
from peak.events.io_events import Selector<br>
from peak.events.io_events import SignalEvents<br>
Selector.sigsrc = binding.Make(SignalEvents,
attrName="sigsrc")<br>
_patchSelector = binding.Make(_patchSelector, uponAssembly=True)<br>
<br>
<br>
I guess, I'll leave it for now, but it is not a kind of code I would
like my colleagues to inherit. If you would provide some directions,
I will consider fixing and testing PEAK signaling with Twisted
support and contributing it to your project.<br>
<br>
<br>
Regards,<br>
Alexey<br>
<br>
<br>
<div class="moz-cite-prefix">On 03/10/15 02:07, PJ Eby wrote:<br>
</div>
<blockquote
cite="mid:CALeMXf7BQh2xc1=9xO=Kuoz8TpSLDfQiZbbTNJeYoUKi0t5jjg@mail.gmail.com"
type="cite">
<pre wrap="">The issue is that ISelector is a subclass of ISignalSource, and so
another Selector is created instead of the SignalSource singleton. I
don't really have a good way to fix this right now, but as a
workaround you could monkeypatch to set Selector.sigsrc to
io_events.SignalEvents and see how that works. (In truth, I think the
real problem may be that PEAK's signals support was never tested in
conjunction with Twisted, and IIRC, the signals support was only
half-baked to begin with when most work on PEAK ceased 10-11 years
ago.)
On Fri, Oct 2, 2015 at 6:51 AM, Alexey Smishlayev <a class="moz-txt-link-rfc2396E" href="mailto:alexey@xtech2.lv"><alexey@xtech2.lv></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello!
I tried using pdb today, to some degree of success. Turns out that
eventLoop.sigsrc attribute gets an instance of
"peak.events.twisted_support.Selector". eventLoop.signals attribute is
"binding.Delegate('sigsrc')", so it gets resolved to
"peak.events.twisted_support.Selector.signals", which is
"binding.Delegate('sigsrc')" - that's where recursion appears.
I've gathered some evidence using pdb:
</pre>
<blockquote type="cite">
<pre wrap="">
/Library/Python/2.7/site-packages/peak/config/config_components.py(398)lookup()
</pre>
</blockquote>
<pre wrap="">-> for value in iterValues(component, configKey):
(Pdb) component
<peak.config.config_components.ServiceArea object at 0x108ba3390>
(Pdb) configKey
config.MultiKey(<class 'peak.binding.interfaces.IComponentFactory'>, <class
'peak.events.interfaces.ISignalSource'>)
(Pdb) [x for x in iterValues(component, configKey)]
[<class 'peak.events.twisted_support.Selector'>, <class
'peak.events.io_events.SignalEvents'>]
--
</pre>
<blockquote type="cite">
<pre wrap="">
/Library/Python/2.7/site-packages/peak/config/config_components.py(384)iterValues()
</pre>
</blockquote>
<pre wrap="">-> value = gcd(forObj, configKey)
(Pdb) forObj
<peak.config.config_components.ServiceArea object at 0x108ba3390>
(Pdb) configKey
config.MultiKey(<class 'peak.binding.interfaces.IComponentFactory'>, <class
'peak.events.interfaces.ISignalSource'>)
(Pdb) gcd
<bound method ServiceArea._getConfigData of
<peak.config.config_components.ServiceArea object at 0x108ba3390>>
(Pdb) gcd(forObj, configKey)
<class 'peak.events.twisted_support.Selector'>
--
</pre>
<blockquote type="cite">
<pre wrap="">
/Library/Python/2.7/site-packages/peak/config/config_components.py(593)_getConfigData()
</pre>
</blockquote>
<pre wrap="">-> value = rule.get()(self, configKey, forObj)
(Pdb) rule.get()
<function f at 0x1094bfcf8>
(Pdb) rule.get()(self, configKey, forObj)
<class 'peak.events.twisted_support.Selector'>
Unfortunately, my efforts stop here. I have no idea where from this function
f appeared in configuration rules, but it creates Selector instance, which
messes up the lookup.
>From peak.ini: " peak.events.interfaces.ISignalSource =
io_events.SignalEvents"
I tried grepping "ISignalSource" in my project's directory, but this gives
no results.
Regards,
Alexey
On 30/09/15 02:12, PJ Eby wrote:
The failure is in trying to retrieve the `signals()` method from the
ISignalSource, which should be the io_events.SignalSource singleton.
What I don't understand is why it's recursing on the attempt to
retrieve the signals attribute. Specifically, it seems as though this
should only be able to happen if trying to load the 'sigsrc' attribute
results in an attempt to load the 'signals' attribute. I would
suggest stepping through with the debugger from line 66 of
scheduler.py and see if you can tell what's happening there.
On Tue, Sep 29, 2015 at 5:56 PM, Alexey Smishlayev <a class="moz-txt-link-rfc2396E" href="mailto:alexey@xtech2.lv"><alexey@xtech2.lv></a> wrote:
Hello, Phillip!
I use binding.Obtain() on "peak.running.interfaces.IMainLoop", which seem to
be instantiating as "peak.running.scheduler.MainLoop" and the
"peak.events.interfaces.IEventLoop" is bound to
"peak.events.twisted_support.EventLoop". Did not go that far, looked at the
PEAK default event loop and couldn't figure out what's wrong (without
investgating links in the project's .ini file).
Does that mean I cannot use stopOnSignals with the Twisted event loop? Do I
have to implement that method? I believe, it's used because Twisted handles
TCP communications for us.
Best regards,
Alexey Smishlayev
On 30/09/15 00:27, PJ Eby wrote:
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 <a class="moz-txt-link-rfc2396E" href="mailto:alexey@xtech2.lv"><alexey@xtech2.lv></a> 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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</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
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