[lttng-dev] Python Babeltrace - Write multiple streams

[Rocky Dunlap]

Jérémie,

Fantastic - it works using the master branch. Will there be a new tag
anytime soon?

Thanks,
Rocky

On Tue, Nov 10, 2015 at 8:12 AM, Jérémie Galarneau <
jeremie.galarneau at efficios.com> wrote:

> Hi Rocky,
>
> The code looks good at first glance. Can you try with master and see
> if that might be problem that has been fixed since then?
>
> Thanks,
> Jérémie
>
> On Fri, Nov 6, 2015 at 9:40 PM, Rocky Dunlap <rsdunlapiv at gmail.com> wrote:
> > Using the Babletrace Python binding version 1.3, I adapted a simple
> example
> > to try to write a trace with two streams.  It appears to write okay (no
> > errors), but when I attempt to read it back (again using Babeltrace) I
> get
> > an error:
> >
> > [error] Stream 1 is not declared in metadata.
> > [error] Stream index creation error.
> > [error] Open file stream error.
> > [warning] [Context] Cannot open_trace of format ctf at path ./trace.
> >
> > Here is my code to write the streams:
> >
> > ################################
> >
> > from babeltrace import *
> >
> > trace_path = "./trace"
> >
> > print('trace path: {}'.format(trace_path))
> >
> > writer = CTFWriter.Writer(trace_path)
> >
> > clock = CTFWriter.Clock('my_clock')
> > clock.description = 'this is my clock'
> > writer.add_clock(clock)
> >
> > stream_class = CTFWriter.StreamClass('my_stream')
> > stream_class.clock = clock
> >
> > event_class = CTFWriter.EventClass('my_event')
> >
> > int32_field_decl = CTFWriter.IntegerFieldDeclaration(32)
> > int32_field_decl.signed = True
> >
> > event_class.add_field(int32_field_decl, 'my_field')
> >
> > stream_class.add_event_class(event_class)
> >
> > stream = writer.create_stream(stream_class)
> > stream2 = writer.create_stream(stream_class)
> >
> > event = CTFWriter.Event(event_class)
> > event.payload('my_field').value = -23
> > stream.append_event(event)
> >
> > event = CTFWriter.Event(event_class)
> > event.payload('my_field').value = -89
> > stream.append_event(event)
> >
> > event = CTFWriter.Event(event_class)
> > event.payload('my_field').value = -849
> > stream2.append_event(event)
> >
> > event = CTFWriter.Event(event_class)
> > event.payload('my_field').value = 42
> > stream2.append_event(event)
> >
> > stream.flush()
> > stream2.flush()
> >
> > ######################
> >
> > I am sure I am just not quite using the API correctly.  If you can spot
> the
> > error, please let me know.  Also, if anyone can point me to an example of
> > using the python bindings to write out multiple streams, I would
> appreciate
> > it.
> >
> > Thanks!
> > Rocky
> >
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
>
>
>
> --
> Jérémie Galarneau
> EfficiOS Inc.
> http://www.efficios.com
>
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