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

From: Kienan Stewart via lttng-dev <lttng-dev@lists.lttng.org>
To: "Wu, Yannan" <yannanwu@amazon.com>,
	"lttng-dev@lists.lttng.org" <lttng-dev@lists.lttng.org>
Subject: Re: [lttng-dev] [babeltrace2]about python self-defined plugin loading
Date: Thu, 25 Apr 2024 11:43:05 -0400	[thread overview]
Message-ID: <d00cba29-4ebc-4974-890c-ecf821b2fa8a@efficios.com> (raw)
In-Reply-To: <b8b2da19-5c08-4369-9bd4-8a3ae554ac4f@efficios.com>

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@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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