Splunk Add-on Builder: Custom inputs.conf configuration option

MichaelMcAleer — Mon, 09 Nov 2020 12:07:24 GMT

Hi Splunk Community,

I am building a Python modular input using the Splunk add-on builder tool and I want to add a custom configuration option 'performance_custom_metrics' which is optional and set only in inputs.conf, not via the data input UI configuration defined when building the add-on.

Everything seems fine for the most part, but when I try to add a new data input I get the following error about the optional config option:

The following required arguments are missing: performance_custom_metrics

Because performance_custom_metrics is not defined in the add-on UI configuration I am not allowed to create inputs via the UI. Only manual creation via inputs.conf works as expected.

I've set required_on_create and required_on_edit both to False when defining the argument in inputs.py:

scheme.add_argument(smi.Argument(
    'performance_custom_metrics', required_on_create=False,
    required_on_edit=False))

From solnlib/packages/splunklib/modularinput/argument.py #60:

:param required_on_edit: ``Boolean``, whether this arg is required when editing an existing modular input of this kind.
:param required_on_create: ``Boolean``, whether this arg is required when creating a modular input of this kind.

Has anyone any idea what other option I need to set to make performance_custom_metrics an optional input parameter for my add-on?

Re: Splunk Add-on Builder: Custom inputs.conf configuration option

chli_splunk — Fri, 13 Nov 2020 18:15:13 GMT

When you add a parameter thru UI, AoB will do following things for you:

Add the parameter definition in /README/inputs.conf.spec
Add the default value in /default/inputs.conf
Add the parameter in custom REST endpoint to operate this value thru Splunk REST API
Update Addon UI
Update AoB internal metadata

If we want to add one parameter without AoB, please follow Splunk doc to create modular input manually. If we still want to use AoB to read/write this parameter in Python code, please do #1,2,3 manually. But basically this hack approach is not officially supported by AoB. We can try it but not guaranteed it's gonna work.

Personal speaking, add this optional parameter via AoB UI with a default value is not harmful. If you really want to hide it from Addon UI, you can try to add it first, and then update Addon frontend code to remove it. That could be an easier approach.

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Splunk Add-on Builder: Custom inputs.conf configuration option

Re: Splunk Add-on Builder: Custom inputs.conf configuration option