[Telepathy] Accessing Folks from python, part 2

[Philip Withnall]

On Mon, 2012-01-23 at 18:13 +0100, Frederik Elwert wrote:
> Am Montag, den 23.01.2012, 16:45 +0000 schrieb Philip Withnall:
> > On Mon, 2012-01-23 at 16:21 +0100, Frederik Elwert wrote:
> > > Am Montag, den 23.01.2012, 14:40 +0000 schrieb Philip Withnall:
> > > > On Mon, 2012-01-23 at 10:22 +0100, Frederik Elwert wrote:
> > > > > Hello,
> > > > > 
> > > > > I am still trying to write a Folks client in Python. Thanks again for
> > > > > the fast fix for my last issue.
> > > > > 
> > > > > Since I had some trouble getting folks 0.6.6 running on Ubuntu 11.10, I
> > > > > just upgraded to 12.04, which has folks 0.6.6. Now I am trying again to
> > > > > digg into the python/Folks combo.
> > > > > 
> > > > > I tried with this simple test script:
> > > > > 
> > > > > ----8<----
> > > > > from gi.repository import GObject
> > > > > from gi.repository import Folks
> > > > > 
> > > > > 
> > > > > def list_individuals():
> > > > >     for key in aggregator.props.individuals.props.keys:
> > > > >         print aggregator.props.individuals.get(key)
> > > > > 
> > > > > aggregator = Folks.IndividualAggregator.new()
> > > > > aggregator.prepare(None, None)
> > > > > 
> > > > > GObject.timeout_add(2000, list_individuals)
> > > > > 
> > > > > main_loop = GObject.MainLoop()
> > > > > main_loop.run()
> > > > > ---->8----
> > > > > 
> > > > > Now I get this traceback:
> > > > > 
> > > > > Traceback (most recent call last):
> > > > >   File "folkstest.py", line 6, in list_individuals
> > > > >     for key in aggregator.props.individuals.props.keys:
> > > > > TypeError: '__main__.GeeHashMapKeySet' object is not iterable
> > > > > 
> > > > > So the gee bindings seem not to work the python way. I read the gee API
> > > > > doc, and then came up with something I had hoped would work:
> > > > > 
> > > > > ----8<----
> > > > > def list_individuals():
> > > > >     iterator = aggregator.props.individuals.props.keys.iterator()
> > > > >     while iterator.has_next():
> > > > >         iterator.next()
> > > > >         key = iterator.get()
> > > > >         print aggregator.props.individuals.get(key)
> > > > > ---->8----
> > > > > 
> > > > > This, however, segfaults. The issue seems to be the iterator.get()
> > > > > method call. I tried to get a backtrace using gdb, but since my
> > > > > debugging skills are very limited, I am not sure how useful it is. I
> > > > > attached it anyways, if you need more information, please just let me
> > > > > know.
> > > > 
> > > > You should be able to trim the code down to:
> > > > 
> > > > while iterator.next():
> > > >     key = iterator.get()
> > > >     print aggregator.props.individuals.get(key)
> > > 
> > > Okay, I changed my sample script accordingly. Thanks for the hint.
> > > However, still segfaulting.
> > > 
> > > > To my untrained eye, it looks like Python doesn't like the code, though,
> > > > since the stack trace contains a call to "PyErr_Print". If you inspected
> > > > this frame more closely (e.g. "frame 48; info locals" in gdb) that might
> > > > give a hint.
> > > > 
> > > > In any case, could you use the "backtrace full" command in gdb to get a
> > > > more detailed stack trace please?
> > > 
> > > I did this, please see the attached backtrace.
> > 
> > Looks like you're missing debug information for Python. Could you make
> > sure you've got the Python runtime debug symbols installed and get a
> > better stack trace please?
> 
> Yes, look like it. But I made sure I installed python-dbg, and gdb
> prints this on startup:
> 
> Reading symbols from /usr/bin/python...Reading symbols
> from /usr/lib/debug/usr/bin/python2.7...done.
> 
> Is there any other package with debug symbols that might be missing
> here? I am sorry, but I am not very familiar with gdb magic.

I'm not particularly familiar with how Ubuntu package debug symbols, but
if you search for information about "ddeb" packages, you might be able
to make use of the debug packages here:

http://ddebs.ubuntu.com/pool/main/p/

That's all I know about; sorry if this isn't very helpful.

Philip

> > Hopefully then someone who knows about PyGObject can take a look at it.
> > 
> > Philip
> > 
> > > > > Now I don’t know if I just used the API incorrectly, or if gee just does
> > > > > not work from Python. But I still hope to use Folks from python, and I
> > > > > wanted to investigate a bit further, before I ditch everything and start
> > > > > all over with vala.
> > > > 
> > > > Don't give up! Every problem which gets fixed as a result of using folks
> > > > from Python will help everyone.
> > > 
> > > You’re right. I just can be frustrating at times to spend all the time
> > > getting the prerequisites up and running, instead of actually writing
> > > code for the project.
> > > 
> > > Anyway, thank you for your help!
> > > 
> > > Regards
> > > Frederik
> > > _______________________________________________
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> > > telepathy at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/telepathy
> > 
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> 
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