[lttng-dev] [Babeltrace 2] Make use of self constructed python plugin

[Wu, Yannan]

Hi, There,

I am trying to construct a customized filter and sink based on babeltrace2 python binding. However, nether mine plugin nor the limited plugins sample I could find on the internet all dont work.

For example, https://github.com/simark/babeltrace-fun-plugins/tree/master/my-first-components

I just downloaded the py file and run the exact command, it failed. The log is as following:

yannanwu at ue91e96f2951b5c:~/trees/lttng_test_run$ babeltrace2 --plugin-path . -c source.demo.MyFirstSource -c sink.demo.MyFirstSink
04-24 16:52:04.349 919805 919805 E CLI add_descriptor_to_component_descriptor_set at babeltrace2.c:1720 Cannot find component class: plugin-name="demo", comp-cls-name="MyFirstSource", comp-cls-type=1
04-24 16:52:04.349 919805 919805 E CLI cmd_run_ctx_init at babeltrace2.c:1882 Cannot find an operative message interchange protocol version to use to create the `run` command's graph: status=ERROR
04-24 16:52:04.349 919805 919805 E CLI cmd_run at babeltrace2.c:2465 Cannot initialize the command's context.

ERROR:    [Babeltrace CLI] (babeltrace2.c:2465)
  Cannot initialize the command's context.
CAUSED BY [Babeltrace CLI] (babeltrace2.c:1882)
  Cannot find an operative message interchange protocol version to use to create the `run` command's graph: status=ERROR
CAUSED BY [Babeltrace CLI] (babeltrace2.c:1720)
  Cannot find component class: plugin-name="demo", comp-cls-name="MyFirstSource", comp-cls-type=1
yannanwu at ue91e96f2951b5c:~/trees/lttng_test_run$ babeltrace2 --version
Babeltrace 2.0.7 "Amqui" [v2.0.6-1-g825a0ed6d]

Amqui (/ɒmkwiː/) is a town in eastern Québec, Canada, at the base of the Gaspé peninsula in Bas-Saint-Laurent. Located at the
confluence of the Humqui and Matapédia Rivers, its proximity to woodlands makes it a great destination for outdoor activities such as
camping, hiking, and mountain biking.
yannanwu at ue91e96f2951b5c:~/trees/lttng_test_run$

Is the cli changed or something? How can I make it right?

Besides, is it possible we create a pipeline in python and make use the the python drafted plugin? Can you advise me how?

Amanda
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