Default message level in Python gallery scripts

[knoepfel]

This issue has been migrated from https://cdcvs.fnal.gov/redmine/issues/26054 (FNAL account required)
Originally created by @PetrilloAtWork on 2021-07-19 20:10:35

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When not initialising MessageFacility explicitly, the verbosity level in gallery is set to DEBUG, which yields messages like

Product created with id: [xxx] from canonical product name: ...

.

Supposing that MessageFacility gets initialised somewhere by gallery, I would like that initialisation to set rather a INFO or WARNING level.

Steps to reproduce:

1. have an art/ROOT file ready with some data product tag
2. set up gallery and whatever it takes to correctly read that file
3. start a Python session:

import ROOT
events = ROOT.gallery.Event(ROOT.std.vector[ROOT.std.string]([ "my/input/file.root" ]))
events.getValidHandle[ROOT.std.vector[ROOT.my.dataProduct]](ROOT.art.InputTag("tag"))

[knoepfel]

Comment by @knoepfel on 2021-07-26 15:31:01

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We are currently working to upgrade LArSoft to art 3.09, where the particular DEBUG message above has been removed. Will that be sufficient for your needs?

In order to suppress all DEBUG messages, you may explicitly initialize the message facility with the severity level you desire. We prefer to not adjust the default severity level as this would affect the logging behavior of programs that rely on the default behavior of the message facility.

[knoepfel]

Comment by @PetrilloAtWork on 2021-07-26 21:25:34

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My needs are satisfied by that change.

In terms of changing the default severity level, I am still convinced that it should be considered, limited to the initialization in gallery (i.e. not in art nor in MessageFacility defaults), if technically possible. I don't know how wide the adoption of gallery is among the stakeholders, and I can expect them to have different opinion on the matter.

[knoepfel]

Comment by @knoepfel on 2021-08-02 15:22:15

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We will consider adjusting the default severity level in gallery.