Re: [lttng-dev] [babeltrace2]about python self-defined plugin loading

[Kienan Stewart via lttng-dev <lttng-dev@lists.lttng.org>]

Hi Amanda,

could you double-check to ensure that babeltrace2 was built with 
`--enable-python-plugins`, and that `import bt2` works?

There should be a babeltrace2-python-plugin-provider.so in 
`<libdir>/babeltrace2/plugin-provides`

thanks,
kienan


On 4/24/24 11:28 PM, Wu, Yannan via lttng-dev wrote:
> Hi, There,
> 
> I am trying to construct a customized filter and sink based on 
> babeltrace2 python binding. However, nether mine plugin nor the 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 <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:
> 
> 
> 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@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@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@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
> 
> 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@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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