[lttng-dev] python bindings for babel trace example fails

[Jérémie Galarneau]

Forgot to CC lttng-dev:

On second thought, this is expected since this is the example from
master which demonstrates the use of new APIs.
The "name" property didn't exist in 1.2.

Regards,
Jérémie

On Fri, Jan 23, 2015 at 11:00 AM, Yan Grange <ygrange at gmail.com> wrote:
> Good afternoon,
>
> I have been able to get lttng running on a machine and now would like to do some experiments with babeltrace. I’d like to write out a ctf file using babeltrace. Therefore I wanted to try out the babeltrace python bindings out and since you provide a set of examples, of which one is about writing a ctf, I wanted to try that one out.
>
> When I use the latste release of babeltrace (1.2.4), the library fails on the following line:
>
> print("Clock name is \"{}\"".format(clock.name))
>
> because it seems like the getter for clock.name doesn’t exist. to solve the issues I have with this example, I have checked out the most recent version of babeltrace from the git repo. If I run the ctf_writer using python, I get
>
> yan at paul ~/build_bbt/babeltrace/bindings/python/examples $ python3 ctf_writer.py
> Writing trace at /tmp/tmptlhq3i
> Clock name is "A_clock"
> Clock description is "Simple clock"
> Clock frequency is 1000000000
> Clock precision is 1
> Clock offset_seconds is 0
> Clock offset is 0
> Clock is absolute: False
> Clock time is 0
> Clock UUID is 874be90c-6c68-46ee-ac0d-6142cafe23f5
>
> Fields in default packet context:
> <class 'babeltrace.CTFWriter.IntegerFieldDeclaration'> timestamp_begin
> <class 'babeltrace.CTFWriter.IntegerFieldDeclaration'> timestamp_end
> <class 'babeltrace.CTFWriter.IntegerFieldDeclaration'> content_size
> <class 'babeltrace.CTFWriter.IntegerFieldDeclaration'> packet_size
> <class 'babeltrace.CTFWriter.IntegerFieldDeclaration'> events_discarded
> <babeltrace.CTFWriter.Writer object at 0x7f57058360d0>
> close: Bad file descriptor
> Traceback (most recent call last):
>   File "ctf_writer.py", line 130, in <module>
>     stream.append_event(event)
>   File "/usr/lib64/python3.3/site-packages/babeltrace.py", line 3462, in append_event
>     raise ValueError("Could not append event to stream.")
> ValueError: Could not append event to stream.
>
>
> Is this a reproducible issue? I am on a gentoo system (3.17.7), with python3 version Python 3.3.5 (default, Jan 14 2015, 19:01:12) [GCC 4.8.3] on linux
>
> For compilation, I used the following flags of the configure script:
>
> ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --libdir=/usr/lib64 --enable-glibtest --enable-python-bindings
>
> Is there anything I cold do to fix this?
>
> Regards,
>
> Yan Grange
>
>
>
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-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com