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

[Wu, Yannan]

Hihi, Kienan,

I finally find a workaround. I could success with the following code:
file_name = "bt_plugin_latency_filter.py"
current_directory=os.getcwd()

file_path = os.path.join(current_directory, file_name)
pset=bt2.find_plugins_in_path(file_path)

forplugininpset:

if plugin.name=="latency_filter"and hasattr(plugin,"filter_component_classes"):

    latency_filter_comp_cls=plugin.filter_component_classes['LatencyFilter']



But loading the whole directory, it just doesnt work from command line.

Amanda















________________________________
From: Kienan Stewart <kstewart at efficios.com>
Sent: Thursday, April 25, 2024 11:43:05 PM
To: Wu, Yannan; lttng-dev at lists.lttng.org
Subject: RE: [EXTERNAL] [lttng-dev] [babeltrace2]about python self-defined plugin loading

CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.



My apologies,

there is a typo in my previous e-mail, the library directory should be:

`<libdir>/babeltrace2/plugin-providers/'

thanks,
kienan

On 4/25/24 11:41 AM, Kienan Stewart via lttng-dev wrote:
> 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 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
>>
>> 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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